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* [Bug middle-end/85559] [meta-bug] Improve conditional move
[not found] <bug-85559-4@http.gcc.gnu.org/bugzilla/>
@ 2018-08-10 9:44 ` marxin at gcc dot gnu.org
2021-07-20 0:45 ` pinskia at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 5+ messages in thread
From: marxin at gcc dot gnu.org @ 2018-08-10 9:44 UTC (permalink / raw)
To: gcc-bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85559
Bug 85559 depends on bug 83610, which changed state.
Bug 83610 Summary: Come up with __builtin_expect_with_probabilty
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83610
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-612483-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 09:44:17 2018
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From: "richard.earnshaw at arm dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/86904] Column numbers ignore tab characters
Date: Fri, 10 Aug 2018 09:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86904
--- Comment #1 from richard.earnshaw at arm dot com ---
On 09/08/18 21:08, dmalcolm at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86904
>
> Bug ID: 86904
> Summary: Column numbers ignore tab characters
> Product: gcc
> Version: unknown
> Status: UNCONFIRMED
> Keywords: diagnostic
> Severity: normal
> Priority: P3
> Component: other
> Assignee: unassigned at gcc dot gnu.org
> Reporter: dmalcolm at gcc dot gnu.org
> Target Milestone: ---
>
> As noted in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19165#c21 :
>
> /* Both gcc and emacs number source *lines* starting at 1, but
> they have differing conventions for *columns*.
>
> GCC uses a 1-based convention for source columns,
> whereas Emacs's M-x column-number-mode uses a 0-based convention.
>
> For example, an error in the initial, left-hand
> column of source line 3 is reported by GCC as:
>
> some-file.c:3:1: error: ...etc...
>
> On navigating to the location of that error in Emacs
> (e.g. via "next-error"),
> the locus is reported in the Mode Line
> (assuming M-x column-number-mode) as:
>
> some-file.c 10% (3, 0)
>
> i.e. "3:1:" in GCC corresponds to "(3, 0)" in Emacs. */
>
> In terms of 0 vs 1, GCC complies with the GNU standards here:
> https://www.gnu.org/prep/standards/html_node/Errors.html
>
> However our "column numbers" are also simply a 1-based byte-count, so a tab
> character is treated by us as simply an increment of 1 right now.
>
> (see also PR 49973, which covers the case of multibyte characters).
>
> It turns out that we convert tab characters to *single* space characters when
> printing source code.
>
> This behavior has been present since Manu first implemented
> -fdiagnostics-show-caret in r186305 (aka
> 5a9830842f69ebb059061e26f8b0699cbd85121e, PR 24985), where it was this logic
> (there in diagnostic.c's diagnostic_show_locus):
> char c = *line == '\t' ? ' ' : *line;
> pp_character (context->printer, c);
>
> (that logic is now in diagnostic-show-locus.c in layout::print_source_line)
>
> This is arguably a bug, but it's intimately linked to the way in which we track
> "column numbers".
>
> Our "column numbers" are currently simply a 1-based byte-count, I believe, so a
> tab character is treated by us as simply an increment of 1 right now.
>
> There are similar issues with encodings that aren't 1 byte per character (e.g.
> non-ASCII unicode characters), which are being tracked in PR 49973.
>
> Presumably, when we print source lines containing tab characters, we should
> emit a number of spaces to reach a tab stop.
>
> Consider a diagnostic with a multiline range covering the
> following source (and beyond):
>
> indent: 6 (tabs: 0, spaces: 6)
> indent: 7 (tabs: 0, spaces: 7)
> indent: 8 (tabs: 1, spaces: 0)
> indent: 9 (tabs: 1, spaces: 1)
>
> i.e.:
>
> " indent: 6 (tabs: 0, spaces: 6)\n"
> " indent: 7 (tabs: 0, spaces: 7)\n"
> "\tindent: 8 (tabs: 1, spaces: 0)\n"
> "\t indent: 9 (tabs: 1, spaces: 1)\n"
>
> Currently diagnostic_show_locus prints:
>
> indent: 6 (tabs: 0, spaces: 6)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> indent: 7 (tabs: 0, spaces: 7)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> indent: 8 (tabs: 1, spaces: 0)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> indent: 9 (tabs: 1, spaces: 1)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> i.e:
> " indent: 6 (tabs: 0, spaces: 6)\n"
> " ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n"
> " indent: 7 (tabs: 0, spaces: 7)\n"
> " ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n"
> " indent: 8 (tabs: 1, spaces: 0)\n"
> " ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n"
> " indent: 9 (tabs: 1, spaces: 1)\n"
> " ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n"
>
> which misrepresents the indentation of the user's code.
>
> It should respect tabstops, and print:
>
> indent: 6 (tabs: 0, spaces: 6)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> indent: 7 (tabs: 0, spaces: 7)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> indent: 8 (tabs: 1, spaces: 0)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> indent: 9 (tabs: 1, spaces: 1)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> i.e.:
>
> " indent: 6 (tabs: 0, spaces: 6)\n"
> " ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n"
> " indent: 7 (tabs: 0, spaces: 7)\n"
> " ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n"
> " indent: 8 (tabs: 1, spaces: 0)\n"
> " ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n"
> " indent: 9 (tabs: 1, spaces: 1)\n"
> " ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n"
>
> We should also handle erroneous leading spaces before a tab, so that e.g.
>
> " \tfoo"
>
> should be printed as if it were:
>
> "\tfoo"
>
> (given that that's what the user's editor is probably printing it as).
>
> Similarly, we should presumably print "8" for the column number for the 'f' of
> "foo". However, IDEs are expecting GCC's existing behavior, so we should
> probably add a command-line option for controlling this.
>
> Adding a left margin with line numbers (as of r263450) doesn't change this bug,
> but makes fixing it slightly more complicated.
>
> Maybe:
> -fdiagnostics-x-coord=bytes : count of bytes
> -fdiagnostics-x-coord=characters : count of characters (not special-casing
> tab)
> -fdiagnostics-x-coord=columns : count of columns: as per characters, but with
> tabs doing tabstops
how about -fdiagnostics-x-coord=visual-[n]
Where n is the size of a hard tab? Some folks change the tab stop to 4,
for example. Or maybe ...coord=tab[-n], where -n defaults to "-8".
R.
> (currently we use "bytes" Not sure if we need "characters")
>
> I'm thinking that internally, we should continue to track byte offsets, but
> make the option affect the presentation of the number in diagnostics*.c.
>
> (should it affect -fdiagnostics-parseable-fixits ?
> see also the Emacs RFE for parseable fixits:
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=25987 )
>
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From: "fro0m.spam at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86908] New: static_cast<BaseTypeWithVirtualMethod*>(&derivedClassObject)->virtualMehod() calls base version of virtualMethod()
Date: Fri, 10 Aug 2018 09:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86908
Bug ID: 86908
Summary: static_cast<BaseTypeWithVirtualMethod*>(&derivedClassO
bject)->virtualMehod() calls base version of
virtualMethod()
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fro0m.spam at gmail dot com
Target Milestone: ---
#include <cstdio>
#include <time.h>
#include <stdlib.h>
#include <new>
class BaseStrategy{
public:
virtual void doIt() {
printf("base do it\n");
};
};
class AStrategy : public BaseStrategy
{
public:
void doIt() {
printf("A do it\n");
};
};
class BStrategy : public BaseStrategy
{
public:
void doIt() {
printf("B do it\n");
};
};
int main()
{
BaseStrategy strategy;
BaseStrategy* strategyPtr = &strategy;
strategyPtr->doIt();
new(&strategy) AStrategy;
static_cast<BaseStrategy*>(&strategy)->doIt();
strategyPtr->doIt();
}
Output in gcc 4.9 and gcc 9.0 is
base do it
base do it
A do it
the right output must be (according to standard and behavior of MSVC 2015 and
clang 6) is
base do it
A do it
A do it
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/83610] Come up with __builtin_expect_with_probabilty
Date: Fri, 10 Aug 2018 09:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83610
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
Implemented.
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86900] [8/9 Regression] -gdwarf-5 -O2 -ffunction-sections = assembler error
Date: Fri, 10 Aug 2018 10:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86900
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
CC| |hubicka at gcc dot gnu.org
Target Milestone|--- |8.3
Summary|-gdwarf-5 -O2 |[8/9 Regression] -gdwarf-5
|-ffunction-sections = |-O2 -ffunction-sections =
|assembler error |assembler error
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Minimal test-case:
$ cat pr86900.cpp
class a;
class b {
public:
b(a);
};
class a {
public:
a(int);
~a();
};
void c(int f) {
a d(0);
b e(d);
}
Started with r249885.
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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/82418] Division on a constant is suboptimal because of not using imul instruction
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #9 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Fixed for gcc-9, thanks for the report.
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Subject: [Bug target/82418] Division on a constant is suboptimal because of not using imul instruction
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--- Comment #8 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Author: amonakov
Date: Fri Aug 10 10:13:37 2018
New Revision: 263467
URL: https://gcc.gnu.org/viewcvs?rev=263467&root=gcc&view=rev
Log:
i386: do not use SImode mul-highpart on 64-bit (PR 82418)
PR target/82418
* config/i386/i386.md (<s>mul<mode>3_highpart): Use DWIH mode iterator
instead of SWI48.
testsuite/
* gcc.target/i386/pr82418.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr82418.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.md
trunk/gcc/testsuite/ChangeLog
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86908] static_cast<BaseTypeWithVirtualMethod*>(&derivedClassObject)->virtualMehod() calls base version of virtualMethod()
Date: Fri, 10 Aug 2018 10:18:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No, your program has undefined behaviour. To make it valid you either need to
use std::launder, or use the pointer that is returned by the placement new.
The compiler is allowed to assume that the dynamic type of &strategy does not
change (that's why you need to use std::launder).
>From gcc-bugs-return-612491-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 10:20:57 2018
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Subject: [Bug c++/86908] static_cast<BaseTypeWithVirtualMethod*>(&derivedClassObject)->virtualMehod() calls base version of virtualMethod()
Date: Fri, 10 Aug 2018 10:20:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This makes the program correct:
strategyPtr = new(&strategy) AStrategy;
static_cast<BaseStrategy*>(std::launder(&strategy))->doIt();
strategyPtr->doIt();
>From gcc-bugs-return-612492-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 10:42:01 2018
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/86904] Column numbers ignore tab characters
Date: Fri, 10 Aug 2018 10:42:00 -0000
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--- Comment #2 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(In reply to richard.earnshaw from comment #1)
> On 09/08/18 21:08, dmalcolm at gcc dot gnu.org wrote:
[...snip...]
> > Maybe:
> > -fdiagnostics-x-coord=bytes : count of bytes
> > -fdiagnostics-x-coord=characters : count of characters (not special-casing
> > tab)
> > -fdiagnostics-x-coord=columns : count of columns: as per characters, but with
> > tabs doing tabstops
>
> how about -fdiagnostics-x-coord=visual-[n]
>
> Where n is the size of a hard tab? Some folks change the tab stop to 4,
> for example. Or maybe ...coord=tab[-n], where -n defaults to "-8".
The C family of frontends already has:
-ftabstop=<number> Distance between tab stops for column reporting.
which IIRC is currently only used by -Wmisleading-indentation. I guess it
could be moved to common.opt.
>From gcc-bugs-return-612493-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 10:46:14 2018
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Subject: [Bug libstdc++/86843] Allow separating debug mode into ABI-changing part and rest
Date: Fri, 10 Aug 2018 10:46:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Hmm, many of the checks in algorithms rely on the fact that the iterators are
Debug Mode iterators (e.g. to check that the end iterator is reachable from the
begin one, or that the iterators are not singular). That means the checks are
not possible without using the Debug Mode containers, which means ABI changes.
These don't depend on debug mode iterators:
// Verify that [_First, _Last) forms a non-empty iterator range.
#define __glibcxx_check_non_empty_range(_First,_Last) \
// Verify that the subscript _N is less than the container's size.
#define __glibcxx_check_subscript(_N) \
// Verify that the bucket _N is less than the container's buckets count.
#define __glibcxx_check_bucket_index(_N) \
_GLIBCXX_DEBUG_VERIFY(_N < this->bucket_count(), \
// Verify that the container is nonempty
#define __glibcxx_check_nonempty() \
_GLIBCXX_DEBUG_VERIFY(! this->empty(), \
// Verify that load factor is positive
#define __glibcxx_check_max_load_factor(_F) \
_GLIBCXX_DEBUG_VERIFY(_F > 0.0f, \
#define __glibcxx_check_equal_allocs(_This, _Other) \
_GLIBCXX_DEBUG_VERIFY(_This.get_allocator() == _Other.get_allocator(), \
// Verify that a predicate is irreflexive
#define __glibcxx_check_irreflexive(_First,_Last) \
_GLIBCXX_DEBUG_VERIFY(_First == _Last || !(*_First < *_First), \
It looks like the is_sorted and is_partitioned and is_heap checks could be
enabled too (and they're definitely not OK for _GLIBCXX_ASSERTIONS because they
change the algorithmic complexity).
>From gcc-bugs-return-612494-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 10:50:16 2018
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Subject: [Bug middle-end/86909] New: Missing common subexpression elimination for types other than int
Date: Fri, 10 Aug 2018 10:50:00 -0000
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Bug ID: 86909
Summary: Missing common subexpression elimination for types
other than int
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Consider the following minimized example of the std::variant visitation:
using size_t = unsigned long long;
struct A {};
static const size_t variant_npos = -1;
struct variant {
A a;
using __index_type = unsigned char; // !!!!
__index_type _M_index;
size_t index() const noexcept {
return (_M_index == __index_type(variant_npos) ? variant_npos :
_M_index);
}
};
template<size_t _Np>
static A* get_if(variant* __ptr) noexcept {
return (__ptr->index() == _Np ? &__ptr->a : nullptr);
}
A* foo(variant& in) {
int i = in.index();
if (i==0) return get_if<0>(&in);
if (i==1) return get_if<1>(&in);
if (i==2) return get_if<2>(&in);
if (i==3) return get_if<3>(&in);
if (i==4) return get_if<4>(&in);
if (i==5) return get_if<5>(&in);
if (i==6) return get_if<6>(&in);
return get_if<7>(&in);
}
GCC generates assembly with multiple comparisons:
foo(variant&):
<...>
cmp ecx, 1
je .L4
cmp ecx, 2
je .L4
cmp ecx, 3
je .L4
cmp ecx, 4
je .L4
cmp ecx, 5
je .L4
cmp ecx, 6
je .L4
cmp dl, 7
je .L4
Clang eliminates the subexpressions:
foo(variant&): # @foo(variant&)
movzx ecx, byte ptr [rdi + 1]
cmp cl, -1
mov edx, -1
cmovne edx, ecx
cmp edx, 7
jb .LBB0_2
mov dl, 7
.LBB0_2:
xor eax, eax
cmp cl, dl
cmove rax, rdi
ret
Note that if we change `__index_type` to `int` then GCC generates great
assembly:
foo(variant&):
mov edx, DWORD PTR [rdi+4]
xor eax, eax
cmp edx, -1
je .L1
cmp edx, 7
cmovbe rax, rdi
.L1:
ret
>From gcc-bugs-return-612495-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 10:53:11 2018
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Subject: [Bug middle-end/86909] Missing common subexpression elimination for types other than int
Date: Fri, 10 Aug 2018 10:53:00 -0000
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--- Comment #1 from Antony Polukhin <antoshkka at gmail dot com> ---
Another std::variant related example where GCC fails to eliminate
subexpressions and generates 6 times bigger assembly:
using size_t = unsigned long long;
struct A {} a;
static const size_t variant_npos = -1;
struct variant {
using __index_type = unsigned char; // !!!! O_O !!!!!!
__index_type _M_index;
size_t index() const noexcept {
return (_M_index == __index_type(variant_npos) ? variant_npos :
_M_index);
}
};
template<size_t _Np>
static A* get_if(variant* __ptr) noexcept {
return (__ptr->index() == _Np ? &a : nullptr);
}
A* foo(int i, variant& in) {
if (i==0) return get_if<0>(&in);
if (i==1) return get_if<1>(&in);
if (i==2) return get_if<2>(&in);
if (i==3) return get_if<3>(&in);
if (i==4) return get_if<4>(&in);
if (i==5) return get_if<5>(&in);
if (i==6) return get_if<6>(&in);
return get_if<7>(&in);
}
>From gcc-bugs-return-612496-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 11:06:48 2018
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Subject: [Bug libstdc++/86910] New: std::filesystem::create_directories doesn't set error code or throw while violating postcondition.
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Bug ID: 86910
Summary: std::filesystem::create_directories doesn't set error
code or throw while violating postcondition.
Product: gcc
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std::filesystem::create_directories should create all directories that don't
exists in the given path. It is not an error if some of the directories exist.
But they must be directories to fulfil the postcondition.
The current implementation doens't signal an error if it didn't create the
directory because a file existed with the same name, so the given postcondition
is_directory(p) is violated but no error occurs.
//create_directories.cpp
#include <filesystem>
#include <fstream>
#include <iostream>
#include <system_error>
namespace fs = std::filesystem;
int main()
{
fs::path p("testxyz");
if(!fs::exists(p)) {
std::ofstream file(p);
file.close();
}
std::error_code ec;
if(fs::create_directories(p, ec))
std::cout << "created" << std::endl;
else
std::cout << "didn't create" << std::endl;
if(!fs::is_directory(p))
std::cerr << "postcondition failed!" << std::endl;
std::cerr << "error code " << (ec?"set":"not set") << std::endl;
fs::remove(p);
}
Compiled on Ubuntu 18.04 with
g++-8 -std=c++17 -o create_dirs create_directories.cpp -lstdc++fs
The expected output would be:
didn't create
postcondition failed!
error code set
but current code gives:
didn't create
postcondition failed!
error code not set
The interface without ec should throw, but doesn't.
>From gcc-bugs-return-612497-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 11:15:56 2018
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Subject: [Bug libstdc++/86910] std::filesystem::create_directories doesn't set error code or throw while violating postcondition.
Date: Fri, 10 Aug 2018 11:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86910
Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-08-10
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Please provide the output of 'gcc -v' as requested by https://gcc.gnu.org/bugs/
>From gcc-bugs-return-612498-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 11:17:53 2018
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Subject: [Bug libstdc++/86910] std::filesystem::create_directories doesn't set error code or throw while violating postcondition.
Date: Fri, 10 Aug 2018 11:17:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Steffen Schuemann from comment #0)
> std::filesystem::create_directories should create all directories that don't
> exists in the given path. It is not an error if some of the directories
> exist. But they must be directories to fulfil the postcondition.
>
> The current implementation doens't signal an error if it didn't create the
> directory because a file existed with the same name, so the given
> postcondition is_directory(p) is violated but no error occurs.
That is the correct behaviour:
https://cplusplus.github.io/LWG/lwg-defects.html#2935
I don't think this is a bug.
>From gcc-bugs-return-612499-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 11:36:38 2018
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Subject: [Bug c++/86728] [7/8/9 Regression] unexpected error: conversion from '<lambda(<type error>, ...)>' to non-scalar type 'std::function<void(int)>' requested
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Jason Merrill <jason at gcc dot gnu.org> changed:
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CC| |jason at gcc dot gnu.org
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>From gcc-bugs-return-612500-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 12:12:09 2018
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Subject: [Bug target/86684] ICE in extract_insn, at recog.c:2304 on ppc64le
Date: Fri, 10 Aug 2018 12:12:00 -0000
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--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Something wrong with that tarball then, maybe? Please try trunk.
>From gcc-bugs-return-612501-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 12:21:42 2018
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Subject: [Bug c++/86911] New: [9 Regression] ICE in gcc/c-family/c-indentation.c:403
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It's a recent regression that I see on Inkscape:
$ abuild@marxinbox:~/rpmbuild/BUILD/inkscape-0.92.3/build/src> cd
/home/abuild/rpmbuild/BUILD/inkscape-0.92.3/build/src && /usr/bin/c++
-DHAVE_CAIRO_PDF=1 -DHAVE_CONFIG_H -DHAVE_POTRACE -DHAVE_TR1_UNORDERED_SET
-DORBIT2=1 -DWITH_CSSBLEND -DWITH_CSSCOMPOSITE -DWITH_MESH -DWITH_SVG2
-D_FORTIFY_SOURCE=2 -Dinkscape_base_EXPORTS
-I/home/abuild/rpmbuild/BUILD/inkscape-0.92.3/build/src
-I/home/abuild/rpmbuild/BUILD/inkscape-0.92.3/src
-I/home/abuild/rpmbuild/BUILD/inkscape-0.92.3
-I/home/abuild/rpmbuild/BUILD/inkscape-0.92.3/build/include -isystem
/usr/include/pango-1.0 -isystem /usr/include/cairo -isystem
/usr/include/pixman-1 -isystem /usr/include/libdrm -isystem
/usr/include/libpng16 -isystem /usr/include/harfbuzz -isystem
/usr/include/fribidi -isystem /usr/include/freetype2 -isystem
/usr/include/glib-2.0 -isystem /usr/lib64/glib-2.0/include -isystem
/usr/include/gc -isystem /usr/include/poppler -isystem /usr/include/libwpg-0.3
-isystem /usr/include/librevenge-0.0 -isystem /usr/include/libvisio-0.1
-isystem /usr/include/libcdr-0.1 -isystem /usr/include/gtkmm-2.4 -isystem
/usr/lib64/gtkmm-2.4/include -isystem /usr/include/atkmm-1.6 -isystem
/usr/include/gtk-unix-print-2.0 -isystem /usr/include/gtk-2.0 -isystem
/usr/include/gdkmm-2.4 -isystem /usr/lib64/gdkmm-2.4/include -isystem
/usr/include/giomm-2.4 -isystem /usr/lib64/giomm-2.4/include -isystem
/usr/include/pangomm-1.4 -isystem /usr/lib64/pangomm-1.4/include -isystem
/usr/include/glibmm-2.4 -isystem /usr/lib64/glibmm-2.4/include -isystem
/usr/include/cairomm-1.0 -isystem /usr/lib64/cairomm-1.0/include -isystem
/usr/include/sigc++-2.0 -isystem /usr/lib64/sigc++-2.0/include -isystem
/usr/lib64/gtk-2.0/include -isystem /usr/include/atk-1.0 -isystem
/usr/include/gdk-pixbuf-2.0 -isystem /usr/include/gtkspell-2.0 -isystem
/usr/include/libxml2 -DNDEBUG -D_FORTIFY_SOURCE=2 -O2 -Wall
-fasynchronous-unwind-tables -fmessage-length=0 -fopenmp
-fstack-clash-protection -fstack-protector-strong -funwind-tables -g
-grecord-gcc-switches -pthread -O2 -g -DNDEBUG -fPIC -pthread -UWITH_LPETOOL
-ULPE_ENABLE_TEST_EFFECTS -pthread -fPIC -o
CMakeFiles/inkscape_base.dir/ui/view/view.cpp.o -c /tmp/ice.ii
abuild@marxinbox:~/rpmbuild/BUILD/inkscape-0.92.3/build/src> cd
/home/abuild/rpmbuild/BUILD/inkscape-0.92.3/build/src && /usr/bin/c++
-DHAVE_CAIRO_PDF=1 -DHAVE_CONFIG_H -DHAVE_POTRACE -DHAVE_TR1_UNORDERED_SET
-DORBIT2=1 -DWITH_CSSBLEND -DWITH_CSSCOMPOSITE -DWITH_MESH -DWITH_SVG2
-D_FORTIFY_SOURCE=2 -Dinkscape_base_EXPORTS
-I/home/abuild/rpmbuild/BUILD/inkscape-0.92.3/build/src
-I/home/abuild/rpmbuild/BUILD/inkscape-0.92.3/src
-I/home/abuild/rpmbuild/BUILD/inkscape-0.92.3
-I/home/abuild/rpmbuild/BUILD/inkscape-0.92.3/build/include -isystem
/usr/include/pango-1.0 -isystem /usr/include/cairo -isystem
/usr/include/pixman-1 -isystem /usr/include/libdrm -isystem
/usr/include/libpng16 -isystem /usr/include/harfbuzz -isystem
/usr/include/fribidi -isystem /usr/include/freetype2 -isystem
/usr/include/glib-2.0 -isystem /usr/lib64/glib-2.0/include -isystem
/usr/include/gc -isystem /usr/include/poppler -isystem /usr/include/libwpg-0.3
-isystem /usr/include/librevenge-0.0 -isystem /usr/include/libvisio-0.1
-isystem /usr/include/libcdr-0.1 -isystem /usr/include/gtkmm-2.4 -isystem
/usr/lib64/gtkmm-2.4/include -isystem /usr/include/atkmm-1.6 -isystem
/usr/include/gtk-unix-print-2.0 -isystem /usr/include/gtk-2.0 -isystem
/usr/include/gdkmm-2.4 -isystem /usr/lib64/gdkmm-2.4/include -isystem
/usr/include/giomm-2.4 -isystem /usr/lib64/giomm-2.4/include -isystem
/usr/include/pangomm-1.4 -isystem /usr/lib64/pangomm-1.4/include -isystem
/usr/include/glibmm-2.4 -isystem /usr/lib64/glibmm-2.4/include -isystem
/usr/include/cairomm-1.0 -isystem /usr/lib64/cairomm-1.0/include -isystem
/usr/include/sigc++-2.0 -isystem /usr/lib64/sigc++-2.0/include -isystem
/usr/lib64/gtk-2.0/include -isystem /usr/include/atk-1.0 -isystem
/usr/include/gdk-pixbuf-2.0 -isystem /usr/include/gtkspell-2.0 -isystem
/usr/include/libxml2 -DNDEBUG -D_FORTIFY_SOURCE=2 -O2 -Wall
-fasynchronous-unwind-tables -fmessage-length=0 -fopenmp
-fstack-clash-protection -fstack-protector-strong -funwind-tables -g
-grecord-gcc-switches -pthread -O2 -g -DNDEBUG -fPIC -pthread -UWITH_LPETOOL
-ULPE_ENABLE_TEST_EFFECTS -pthread -fPIC -o
CMakeFiles/inkscape_base.dir/ui/view/view.cpp.o -c
/home/abuild/rpmbuild/BUILD/inkscape-0.92.3/src/ui/view/view.cpp
In file included from
/usr/include/boost/ptr_container/ptr_sequence_adapter.hpp:20,
from /usr/include/boost/ptr_container/ptr_list.hpp:19,
from
/home/abuild/rpmbuild/BUILD/inkscape-0.92.3/src/document.h:28,
from
/home/abuild/rpmbuild/BUILD/inkscape-0.92.3/src/ui/view/view.cpp:18:
/usr/include/boost/ptr_container/detail/reversible_ptr_container.hpp: In member
function 'void boost::ptr_container_detail::reversible_ptr_container<Config,
CloneAllocator>::constructor_impl(I, I, std::forward_iterator_tag)':
/usr/include/boost/ptr_container/detail/reversible_ptr_container.hpp:316:23:
internal compiler error: in operator[], at input.h:62
316 | if( first == last )
| ^
0x68cee6 get_visual_column
../../gcc/input.h:62
0xf56fe6 should_warn_for_misleading_indentation
../../gcc/c-family/c-indentation.c:403
0xf56fe6 warn_for_misleading_indentation(token_indent_info const&,
token_indent_info const&, token_indent_info const&)
../../gcc/c-family/c-indentation.c:601
0xed544f cp_parser_implicitly_scoped_statement
../../gcc/cp/parser.c:12668
0xed0ee6 cp_parser_selection_statement
../../gcc/cp/parser.c:11466
0xed0ee6 cp_parser_statement
../../gcc/cp/parser.c:10834
0xed0829 cp_parser_statement_seq_opt
../../gcc/cp/parser.c:11292
0xed0829 cp_parser_compound_statement
../../gcc/cp/parser.c:11246
0xed01e0 cp_parser_function_body
../../gcc/cp/parser.c:21923
0xed01e0 cp_parser_ctor_initializer_opt_and_function_body
../../gcc/cp/parser.c:21960
0xed00fc cp_parser_function_definition_after_declarator
../../gcc/cp/parser.c:26975
0xed41be cp_parser_late_parsing_for_member
../../gcc/cp/parser.c:27855
0x61f886 cp_parser_class_specifier_1
../../gcc/cp/parser.c:22895
0xebb6bf cp_parser_class_specifier
../../gcc/cp/parser.c:22925
0xebb6bf cp_parser_type_specifier
../../gcc/cp/parser.c:16906
0xebb6bf cp_parser_decl_specifier_seq
../../gcc/cp/parser.c:13747
0xec4e33 cp_parser_single_declaration
../../gcc/cp/parser.c:27341
0xec4730 cp_parser_template_declaration_after_parameters
../../gcc/cp/parser.c:27033
0xebca4d cp_parser_explicit_template_declaration
../../gcc/cp/parser.c:27270
0xebca4d cp_parser_template_declaration_after_export
../../gcc/cp/parser.c:27289
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://bugs.opensuse.org/> for instructions.
Unfortunately creating a pre-processed file hides the issue. Any possible hint
how to isolate that?
>From gcc-bugs-return-612502-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 12:23:18 2018
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Subject: [Bug target/86684] ICE in extract_insn, at recog.c:2304 on ppc64le
Date: Fri, 10 Aug 2018 12:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86684
--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #7)
> Something wrong with that tarball then, maybe? Please try trunk.
I see it day by day on my periodic tester machine that pulls GCC tip.
>From gcc-bugs-return-612503-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 12:29:30 2018
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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86896] invalid vmovdqa64 instruction for KNL emitted
Date: Fri, 10 Aug 2018 12:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86896
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |NEW
CC| |hjl.tools at gmail dot com,
| |hubicka at gcc dot gnu.org,
| |jakub at gcc dot gnu.org,
| |uros at gcc dot gnu.org
Assignee|marxin at gcc dot gnu.org |unassigned at gcc dot gnu.org
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
So it's hard to isolate self-contained test-case, but we really generate:
vmovdqa64 %xmm16, %xmm4
I'm not i386 expert, but according to this:
https://hjlebbink.github.io/x86doc/html/MOVDQA,VMOVDQA32_64.html
+-----------------------------------------------------------+--------+------------------------+--------------------+---------------------------------------------------------------------------------+
| Opcode/Instruction | Op/En | 64/32
bit Mode Support | CPUID Feature Flag |
Description |
+-----------------------------------------------------------+--------+------------------------+--------------------+---------------------------------------------------------------------------------+
| EVEX.128.66.0F.W1 6F /r VMOVDQA64 xmm1 {k1}{z}, xmm2/m128 | FVM-RM | V/V
| AVX512VL AVX512F | Move aligned quadword integer values from
xmm2/m128 to xmm1 using writemask k1. |
+-----------------------------------------------------------+--------+------------------------+--------------------+---------------------------------------------------------------------------------+
The instruction requires AVX512VL flags, but we don't require it:
953 (define_insn "mov<mode>_internal"
954 [(set (match_operand:VMOVE 0 "nonimmediate_operand"
955 "=v,v ,v ,m")
956 (match_operand:VMOVE 1 "nonimmediate_or_sse_const_operand"
957 " C,BC,vm,v"))]
958 "TARGET_SSE
959 && (register_operand (operands[0], <MODE>mode)
960 || register_operand (operands[1], <MODE>mode))"
961 {
962 switch (get_attr_type (insn))
963 {
964 case TYPE_SSELOG1:
965 return standard_sse_constant_opcode (insn, operands);
966
967 case TYPE_SSEMOV:
968 /* There is no evex-encoded vmov* for sizes smaller than 64-bytes
969 in avx512f, so we need to use workarounds, to access sse
registers
970 16-31, which are evex-only. In avx512vl we don't need
workarounds. */
971 if (TARGET_AVX512F && <MODE_SIZE> < 64 && !TARGET_AVX512VL //
<-------------
972 && (EXT_REX_SSE_REG_P (operands[0])
973 || EXT_REX_SSE_REG_P (operands[1])))
974 {
975 if (memory_operand (operands[0], <MODE>mode))
976 {
977 if (<MODE_SIZE> == 32)
978 return "vextract<shuffletype>64x4\t{$0x0, %g1, %0|%0,
%g1, 0x0}";
979 else if (<MODE_SIZE> == 16)
980 return "vextract<shuffletype>32x4\t{$0x0, %g1, %0|%0,
%g1, 0x0}";
981 else
982 gcc_unreachable ();
983 }
984 else if (memory_operand (operands[1], <MODE>mode))
985 {
986 if (<MODE_SIZE> == 32)
987 return "vbroadcast<shuffletype>64x4\t{%1, %g0|%g0,
%1}";
988 else if (<MODE_SIZE> == 16)
989 return "vbroadcast<shuffletype>32x4\t{%1, %g0|%g0,
%1}";
990 else
991 gcc_unreachable ();
992 }
993 else
994 /* Reg -> reg move is always aligned. Just use wider move.
*/
995 switch (get_attr_mode (insn))
996 {
997 case MODE_V8SF:
998 case MODE_V4SF:
999 return "vmovaps\t{%g1, %g0|%g0, %g1}";
1000 case MODE_V4DF:
1001 case MODE_V2DF:
1002 return "vmovapd\t{%g1, %g0|%g0, %g1}";
1003 case MODE_OI:
1004 case MODE_TI:
1005 return "vmovdqa64\t{%g1, %g0|%g0, %g1}";
1006 default:
1007 gcc_unreachable ();
1008 }
Adding to CC port maintainers.
--- Comment #4 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Yep, it seems that we are missing TARGET_AVX512VL check here. I am also not
very familiar with avx512 ISA extension. Hj, would it be possible for you to
check if we have more missing tests here?
>From gcc-bugs-return-612504-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 12:42:50 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/86912] New: Function pointer imposes an optimization barrier
Date: Fri, 10 Aug 2018 12:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86912
Bug ID: 86912
Summary: Function pointer imposes an optimization barrier
Product: gcc
Version: 9.0
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Consider the following minimized example of std::variant visitation:
struct A {};
struct B : A {};
struct C : A {};
struct D : A {};
struct E : A {};
struct X : A {};
template <class T>
struct helper {
static A& call(void* value) {
return *static_cast<T*>(value);
}
};
A& get_base(int index, void* value) {
using f_ptr = A&(*)(void*);
constexpr f_ptr visitors[] = {
helper<A>::call, helper<B>::call, helper<C>::call,
helper<D>::call, helper<E>::call, helper<X>::call,
};
return visitors[index](value);
}
For the above code GCC generates very suboptimal assembly that fills an array
with pointers and does the jmp:
<...>
get_base(int, void*):
mov QWORD PTR [rsp-56], OFFSET FLAT:(anonymous
namespace)::helper<A>::call(void*)
movsx rax, edi
mov rdi, rsi
mov QWORD PTR [rsp-48], OFFSET FLAT:(anonymous
namespace)::helper<B>::call(void*)
mov QWORD PTR [rsp-40], OFFSET FLAT:(anonymous
namespace)::helper<C>::call(void*)
mov QWORD PTR [rsp-32], OFFSET FLAT:(anonymous
namespace)::helper<D>::call(void*)
mov QWORD PTR [rsp-24], OFFSET FLAT:(anonymous
namespace)::helper<E>::call(void*)
mov QWORD PTR [rsp-16], OFFSET FLAT:(anonymous
namespace)::helper<X>::call(void*)
mov rax, QWORD PTR [rsp-56+rax*8]
jmp rax
Optimal assembly should be the following:
get_base(int, void*):
mov rax, rsi
ret
If we rewrite `get_base` to avoid calls by function pointer, the assembly
becomes optimal:
A& get_base(int index, void* value) {
if (index == 0) return helper<A>::call(value);
if (index == 1) return helper<B>::call(value);
if (index == 2) return helper<C>::call(value);
if (index == 3) return helper<D>::call(value);
if (index == 4) return helper<E>::call(value);
if (index == 5) return helper<X>::call(value);
}
>From gcc-bugs-return-612505-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 13:14:56 2018
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Subject: [Bug c++/86908] static_cast<BaseTypeWithVirtualMethod*>(&derivedClassObject)->virtualMehod() calls base version of virtualMethod()
Date: Fri, 10 Aug 2018 13:14:00 -0000
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Kostya Frumkin <fro0m.spam at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |UNCONFIRMED
Version|unknown |9.0
Resolution|INVALID |---
--- Comment #3 from Kostya Frumkin <fro0m.spam at gmail dot com> ---
(In reply to Jonathan Wakely from comment #1)
> No, your program has undefined behaviour. To make it valid you either need
> to use std::launder, or use the pointer that is returned by the placement
> new.
>
> The compiler is allowed to assume that the dynamic type of &strategy does
> not change (that's why you need to use std::launder).
Hi, for example msvc2013 calls base class's virtual method when msvc2015 calls
derived class's virtual method.
This is developer's mistake which can be predicted by compiler. Few developers
know about this behavior.
It'd be awesome to see the correct behavior or at least warning that base
method is being used after placement new.
>From gcc-bugs-return-612506-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 13:16:46 2018
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Subject: [Bug c++/86911] [9 Regression] ICE in gcc/c-family/c-indentation.c:403
Date: Fri, 10 Aug 2018 13:16:00 -0000
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=70693
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Possibly a dup of PR 70693
>From gcc-bugs-return-612507-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 13:19:11 2018
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Subject: [Bug target/86133] powerpc (-mcpu…48) internal compiler error for double variables
Date: Fri, 10 Aug 2018 13:19:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|powerpc |powerpcspe-*-*
CC| |segher at gcc dot gnu.org
--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This does not happen on trunk, for powerpc-* (-mspe does not exist). Without
-mno-spe it does not ICE, either.
Changing target to powerpcspe.
>From gcc-bugs-return-612508-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 13:28:43 2018
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Subject: [Bug c++/86911] [9 Regression] ICE in gcc/c-family/c-indentation.c:403
Date: Fri, 10 Aug 2018 13:28:00 -0000
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Sounds very probable, this is what I see in GDB:
$ Breakpoint 1, get_visual_column (exploc=..., loc=2147489278,
out=0x7fffffffca24, first_nws=0x0) at
/home/marxin/Programming/gcc2/gcc/c-family/c-indentation.c:79
79 in /home/marxin/Programming/gcc2/gcc/c-family/c-indentation.c
(gdb) p line
$3 = {m_ptr = 0x7ffff5ebde79 " {\n while (__first != __last &&
!__pred(__first))\n\t++__first;\n return __first;\n }\n\n /// This is
an overload used by find algos for the RAI case.\n template<typename
_RandomAccessItera"..., m_n_elts = 5}
$ (gdb) p i
$6 = 6
May I help with debugging or is it clear what happens?
>From gcc-bugs-return-612509-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 13:34:06 2018
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Subject: [Bug target/86684] ICE in extract_insn, at recog.c:2304 on ppc64le
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86684
Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
--- Comment #9 from Segher Boessenkool <segher at gcc dot gnu.org> ---
I found the problem. You need -mno-fprnd to reproduce this. Somehow you
get this by default.
Confirmed.
>From gcc-bugs-return-612510-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 13:36:57 2018
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Subject: [Bug target/86684] ICE in extract_insn, at recog.c:2304 on ppc64le
Date: Fri, 10 Aug 2018 13:36:00 -0000
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--- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Also happens on native builds:
~/build/tot/gcc/f951 -quiet -Wall -W -O2 bounds_check_19.f90 -mabi=elfv2
-mlittle -mno-fprnd
Error: unrecognizable insn:
(insn 79 78 80 6 (set (reg:DI 175)
(unspec:DI [
(reg:SF 176)
] UNSPEC_FCTID)) "bounds_check_19.f90":22 -1
(nil))
during RTL pass: vregs
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Subject: [Bug target/85640] [8/9 Regression] Code size regression vs 7.3.1
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2018-08-10
CC| |amonakov at gcc dot gnu.org
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--- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
This is interesting. First scev-cprop emits computation of final value of 'buf'
before the inner loop. Then ivopts emits the same, but *after* the loop. In
gcc-8, ivopts uses a slightly more efficient form though, so dom3 fails to
unify the two, and we end up with redundant computations. Previously two final
value computations were identical and dom3 managed to clean up.
Final value replacement is unnecessary in this case, 'buf' remains used in the
loop and the final value is non-constant so doesn't lead to further
simplification. I believe we should try to throttle down scev-cprop (especially
for -Os, but likely for -O2 as well).
Emitting final value in the loop preheader instead of after exit may also be
useful as it may reduce the amount of variables that live across the loop.
(-fno-tree-scev-cprop leads to good code on the testcase)
>From gcc-bugs-return-612512-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 14:09:30 2018
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Subject: [Bug fortran/57160] short-circuit IF only with -ffrontend-optimize
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--- Comment #14 from janus at gcc dot gnu.org ---
Author: janus
Date: Fri Aug 10 14:08:53 2018
New Revision: 263471
URL: https://gcc.gnu.org/viewcvs?rev=263471&root=gcc&view=rev
Log:
2018-08-10 Janus Weil <janus@gcc.gnu.org>
PR fortran/57160
* invoke.texi (frontend-optimize): Mention short-circuiting.
* options.c (gfc_post_options): Disable -ffrontend-optimize with -Og.
* resolve.c (resolve_operator): Warn about short-circuiting only with
-ffrontend-optimize.
* trans-expr.c (gfc_conv_expr_op): Use short-circuiting operators only
with -ffrontend-optimize. Without that flag, make sure that both
operands are evaluated.
2018-08-10 Janus Weil <janus@gcc.gnu.org>
PR fortran/57160
* gfortran.dg/actual_pointer_function_1.f90: Fix invalid test case.
* gfortran.dg/inline_matmul_23.f90: Add option "-ffrontend-optimize".
* gfortran.dg/short_circuiting_2.f90: New test case.
* gfortran.dg/short_circuiting_3.f90: New test case.
Added:
trunk/gcc/testsuite/gfortran.dg/short_circuiting_2.f90
trunk/gcc/testsuite/gfortran.dg/short_circuiting_3.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/invoke.texi
trunk/gcc/fortran/options.c
trunk/gcc/fortran/resolve.c
trunk/gcc/fortran/trans-expr.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/actual_pointer_function_1.f90
trunk/gcc/testsuite/gfortran.dg/inline_matmul_23.f90
>From gcc-bugs-return-612513-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 14:27:01 2018
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Subject: [Bug target/86684] ICE in extract_insn, at recog.c:2304 on ppc64le
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|ppc64le-linux-gnu |powerpc*-*-*
Host|x86_64-pc-linux-gnu |
--- Comment #11 from Segher Boessenkool <segher at gcc dot gnu.org> ---
So it seems ppc64le-linux is NOT equivalent to powerpc64le-linux: it fails
here, without the -mno-fprnd flag.
>From gcc-bugs-return-612514-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 14:35:16 2018
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Subject: [Bug c++/86908] static_cast<BaseTypeWithVirtualMethod*>(&derivedClassObject)->virtualMehod() calls base version of virtualMethod()
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Kostya Frumkin from comment #3)
> Hi, for example msvc2013 calls base class's virtual method when msvc2015
> calls derived class's virtual method.
It's undefined behaviour. Anything can happen.
> This is developer's mistake which can be predicted by compiler. Few
> developers know about this behavior.
Using placement new to replace a polymorphic type is not a common idiom, I
don't think it's worth adding a warning about it. Just don't do it.
> It'd be awesome to see the correct behavior or at least warning that base
> method is being used after placement new.
GCC's behaviour is already correct.
>From gcc-bugs-return-612515-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 15:07:06 2018
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Subject: [Bug target/86684] ICE in extract_insn, at recog.c:2304 on ppc64le
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--- Comment #12 from Segher Boessenkool <segher at gcc dot gnu.org> ---
So, ignoring all the configury stuff: the problem is that TARGET_VSX does
not imply TARGET_FPRND. It should.
>From gcc-bugs-return-612516-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 17:47:11 2018
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Subject: [Bug c++/86908] static_cast<BaseTypeWithVirtualMethod*>(&derivedClassObject)->virtualMehod() calls base version of virtualMethod()
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--- Comment #5 from Kostya Frumkin <fro0m.spam at gmail dot com> ---
(In reply to Jonathan Wakely from comment #4)
> (In reply to Kostya Frumkin from comment #3)
> > Hi, for example msvc2013 calls base class's virtual method when msvc2015
> > calls derived class's virtual method.
>
> It's undefined behaviour. Anything can happen.
>
> > This is developer's mistake which can be predicted by compiler. Few
> > developers know about this behavior.
>
> Using placement new to replace a polymorphic type is not a common idiom, I
> don't think it's worth adding a warning about it. Just don't do it.
>
> > It'd be awesome to see the correct behavior or at least warning that base
> > method is being used after placement new.
>
> GCC's behaviour is already correct.
It is best way to get away with heap allocation in many cases. Let's make a
warning about undefined behavior.
>From gcc-bugs-return-612517-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 18:03:11 2018
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86771
--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
So, what is happening at all? What is different during/after combine, etc.?
>From gcc-bugs-return-612518-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 18:32:46 2018
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Subject: [Bug target/86131] powerpc: gcc uses costly multiply instead of shift left
Date: Fri, 10 Aug 2018 18:32:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |segher at gcc dot gnu.org
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
A multiply is cost 2 for mpccore. Expand creates a single "mulli ..,-8"
for this. And no other RTL pass will break this apart again.
>From gcc-bugs-return-612519-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 19:30:57 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/68210] nothrow operator fails to call default new
Date: Fri, 10 Aug 2018 19:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68210
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #0)
> assert (0 == p);
> assert (2 == new_handler_called);
> assert (bad_alloc_thrown);
I think this test case is wrong. The new handler is set, so we never get to:
else {
bad_alloc_thrown = true;
throw MyBadAlloc ();
}
So bad_alloc_throw is never set.
I'm using this instead, which passes with my fixed libstdc++ and with libc++:
int main ()
{
new_called = 0;
void *p = operator new (1, std::nothrow);
VERIFY (p != 0);
VERIFY (1 == new_called);
std::set_new_handler (new_handler);
new_fail = true;
try {
p = operator new (1, std::nothrow);
}
catch (...) {
VERIFY (!"nothrow operator new threw");
}
VERIFY (0 == p);
VERIFY (2 == new_handler_called);
VERIFY (!bad_alloc_thrown);
std::set_new_handler (0);
new_fail = true;
new_handler_called = 0;
try {
p = operator new (1, std::nothrow);
}
catch (...) {
VERIFY (!"nothrow operator new threw");
}
VERIFY (0 == p);
VERIFY (0 == new_handler_called);
VERIFY (bad_alloc_thrown);
}
>From gcc-bugs-return-612520-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 19:35:46 2018
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Subject: [Bug libstdc++/68210] nothrow operator fails to call default new
Date: Fri, 10 Aug 2018 19:35:00 -0000
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Or maybe:
int main ()
{
void *p = operator new (1, std::nothrow);
VERIFY (p != 0);
VERIFY (1 == new_called);
VERIFY (0 == new_handler_called);
VERIFY (!bad_alloc_thrown);
operator delete(p);
new_fail = true;
p = operator new (1, std::nothrow);
VERIFY (0 == p);
VERIFY (2 == new_called);
VERIFY (0 == new_handler_called);
VERIFY (bad_alloc_thrown);
new_fail = true;
bad_alloc_thrown = false;
std::set_new_handler (new_handler);
p = operator new (1, std::nothrow);
VERIFY (0 == p);
VERIFY (3 == new_called);
VERIFY (2 == new_handler_called);
VERIFY (!bad_alloc_thrown);
}
>From gcc-bugs-return-612521-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 20:14:53 2018
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Subject: [Bug target/86197] POWERPC: float128 parameter passing
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86197
--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Fri Aug 10 20:14:11 2018
New Revision: 263477
URL: https://gcc.gnu.org/viewcvs?rev=263477&root=gcc&view=rev
Log:
Backport from mainline
2018-06-19 Segher Boessenkool <segher@kernel.crashing.org>
PR target/86197
* config/rs6000/rs6000.md (rs6000_discover_homogeneous_aggregate): An
ieee128 argument takes up only one (vector) register, not two (floating
point) registers.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/rs6000/rs6000.c
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Subject: [Bug fortran/57160] short-circuit IF only with -ffrontend-optimize
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janus at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=58224
Resolution|--- |FIXED
Assignee|tkoenig at gcc dot gnu.org |janus at gcc dot gnu.org
Target Milestone|--- |9.0
--- Comment #15 from janus at gcc dot gnu.org ---
The issue is fixed with r263471.
As a follow up, the -fcheck diagnostics should be improved (see e.g. PR 58224),
so that cases like the one in comment #0 give a proper runtime error instead of
a segfault.
>From gcc-bugs-return-612522-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 20:21:10 2018
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Subject: [Bug libstdc++/68210] nothrow operator fails to call default new
Date: Fri, 10 Aug 2018 20:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68210
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Fri Aug 10 20:20:27 2018
New Revision: 263478
URL: https://gcc.gnu.org/viewcvs?rev=263478&root=gcc&view=rev
Log:
PR libstdc++/68210 adjust operator new and delete for LWG 206
Ensure that nothrow versions of new and delete call the ordinary
versions of new or delete, instead of calling malloc or free directly.
These files are all compiled with -std=gnu++14 so can use noexcept and
nullptr to make the code more readable.
PR libstdc++/68210
* doc/xml/manual/intro.xml: Document LWG 206 change.
* libsupc++/del_op.cc: Replace _GLIBCXX_USE_NOEXCEPT with noexcept.
* libsupc++/del_opa.cc: Likewise.
* libsupc++/del_opant.cc: Likewise.
* libsupc++/del_opnt.cc: Likewise. Call operator delete(ptr) instead
of free(ptr).
* libsupc++/del_ops.cc: Replace _GLIBCXX_USE_NOEXCEPT with noexcept.
* libsupc++/del_opsa.cc: Likewise.
* libsupc++/del_opva.cc: Likewise.
* libsupc++/del_opvant.cc: Likewise.
* libsupc++/del_opvnt.cc: Likewise. Call operator delete[](ptr)
instead of operator delete(ptr).
* libsupc++/del_opvs.cc: Replace _GLIBCXX_USE_NOEXCEPT with noexcept.
* libsupc++/del_opvsa.cc: Likewise.
* libsupc++/new_op.cc: Use __builtin_expect in check for zero size.
* libsupc++/new_opa.cc: Use nullptr instead of literal 0.
* libsupc++/new_opant.cc: Likewise. Replace _GLIBCXX_USE_NOEXCEPT
with noexcept.
* libsupc++/new_opnt.cc: Likewise. Call operator new(sz) instead of
malloc(sz).
* libsupc++/new_opvant.cc: Use nullptr and noexcept.
* libsupc++/new_opvnt.cc: Likewise. Call operator new[](sz) instead of
operator new(sz, nothrow).
* testsuite/18_support/new_nothrow.cc: New test.
Added:
trunk/libstdc++-v3/testsuite/18_support/new_nothrow.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/doc/xml/manual/intro.xml
trunk/libstdc++-v3/libsupc++/del_op.cc
trunk/libstdc++-v3/libsupc++/del_opa.cc
trunk/libstdc++-v3/libsupc++/del_opant.cc
trunk/libstdc++-v3/libsupc++/del_opnt.cc
trunk/libstdc++-v3/libsupc++/del_ops.cc
trunk/libstdc++-v3/libsupc++/del_opsa.cc
trunk/libstdc++-v3/libsupc++/del_opva.cc
trunk/libstdc++-v3/libsupc++/del_opvant.cc
trunk/libstdc++-v3/libsupc++/del_opvnt.cc
trunk/libstdc++-v3/libsupc++/del_opvs.cc
trunk/libstdc++-v3/libsupc++/del_opvsa.cc
trunk/libstdc++-v3/libsupc++/new_op.cc
trunk/libstdc++-v3/libsupc++/new_opa.cc
trunk/libstdc++-v3/libsupc++/new_opant.cc
trunk/libstdc++-v3/libsupc++/new_opnt.cc
trunk/libstdc++-v3/libsupc++/new_opvant.cc
trunk/libstdc++-v3/libsupc++/new_opvnt.cc
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Subject: [Bug fortran/84094] several correctness issues in gfortran.dg
Date: Fri, 10 Aug 2018 20:21:00 -0000
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Bug 84094 depends on bug 57160, which changed state.
Bug 57160 Summary: short-circuit IF only with -ffrontend-optimize
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57160
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----------------------------------------------------------------------------
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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86197] POWERPC: float128 parameter passing
Date: Fri, 10 Aug 2018 20:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86197
--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Fri Aug 10 20:46:04 2018
New Revision: 263479
URL: https://gcc.gnu.org/viewcvs?rev=263479&root=gcc&view=rev
Log:
Backport from mainline
2018-06-19 Segher Boessenkool <segher@kernel.crashing.org>
PR target/86197
* config/rs6000/rs6000.md (rs6000_discover_homogeneous_aggregate): An
ieee128 argument takes up only one (vector) register, not two (floating
point) registers.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/config/rs6000/rs6000.c
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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86197] POWERPC: float128 parameter passing
Date: Fri, 10 Aug 2018 20:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86197
Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Fixed everywhere.
>From gcc-bugs-return-612527-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 20:54:21 2018
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From: "yavor at gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug objc/86913] New: Sending a nil message using a method signature returning a struct corrupts the stack
Date: Fri, 10 Aug 2018 20:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86913
Bug ID: 86913
Summary: Sending a nil message using a method signature
returning a struct corrupts the stack
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: objc
Assignee: unassigned at gcc dot gnu.org
Reporter: yavor at gnu dot org
Target Milestone: ---
Created attachment 44524
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44524&action=edit
Preprocessed source of the test program
Josh Freeman discovered that sending a nil message using a method signature
that returns a structure results in:
1. Garbage values in the returned structure's members (affects: x86/x86_64,
with and without optimization)
2. A corrupted stack (affects: x86 with -O1 or -O2)
After some investigation, I can confirm that this bug was fixed in April 2013
(r198140, PR target/57018). But the change was reverted in November 2013 as
part of a fix for PR target/57293 (r205498). AFAICT all compiler versions are
affected, except 4.8 (the fix was backported to the gcc-4_8-branch in May
2013).
Minimized test program based on Josh's test program for GNUstep:
...
#include <objc/runtime.h>
#import <objc/Object.h>
int printf (const char *, ...);
struct Size { float w; float h; };
static const struct Size ZeroSize = {0.0, 0.0};
@interface NilMsgCheck : Object
+ (id) new;
- (struct Size) nmcZeroSize;
- (void) nmcSendNilMsg;
@end
@implementation NilMsgCheck
+ (id) new
{
return class_createInstance (self, 0);
}
- (struct Size) nmcZeroSize
{
return ZeroSize;
}
- (void) nmcSendNilMsg
{
struct Size size = [self nmcZeroSize];
printf ("[self nmcZeroSize] returned: w = %f; h = %f\n", size.w, size.h);
size = [nil nmcZeroSize];
printf ("[nil nmcZeroSize] returned: w = %f; h = %f\n", size.w, size.h);
}
@end
int
main (void)
{
NilMsgCheck *object = [NilMsgCheck new];
[object nmcSendNilMsg];
return 0;
}
...
On x86_64-linux-gnu, it prints:
[self nmcZeroSize] returned: w = 0.000000; h = 0.000000
[nil nmcZeroSize] returned: w = -nan; h = 0.000000
On x86-linux-gnu (with optimization) it segfaults (or, if built with
-fstack-protector-strong it aborts with "stack smashing detected").
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/yavor/libexec/gcc/i686-pc-linux-gnu/8.2.0/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ./configure --prefix=/home/yavor --disable-nls
--disable-multilib --enable-languages=c,objc
Thread model: posix
gcc version 8.2.0 (GCC)
>From gcc-bugs-return-612528-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 10 21:24:47 2018
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From: "even.rouault at spatialys dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/86914] New: gcc 8.1 -O2 generates wrong code with strlen() of pointers within one-element arrays of structures
Date: Fri, 10 Aug 2018 21:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86914
Bug ID: 86914
Summary: gcc 8.1 -O2 generates wrong code with strlen() of
pointers within one-element arrays of structures
Product: gcc
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The following code
{{{
#include <string.h>
struct s
{
int i;
char c[1];
};
size_t foo(struct s* p)
{
return strlen(p->c+1);
}
}}}
compiled with gcc 8.1 -O2 generates the following code
{{{
0000000000000000 <foo>:
0: 31 c0 xor %eax,%eax
2: c3 retq
}}}
returning 0
Previous gcc versions generate the "correct" code
{{{
0000000000000000 <foo>:
0: 48 83 c7 05 add $0x5,%rdi
4: e9 00 00 00 00 jmpq 9 <foo+0x9> 5: R_X86_64_PC32
strlen-0x4
}}}
According to https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html , """Although
using one-element arrays this way is discouraged, GCC handles accesses to
trailing one-element array members analogously to zero-length arrays. """
If modifying c[1] to be c[0], gcc 8.1 -O2 generates the correct code. If
changing strlen(p->c+1) to strlen(p->c), the correct code is although generated
So it looks to be a too agressive optimization.
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Subject: [Bug libstdc++/68210] nothrow operator fails to call default new
Date: Fri, 10 Aug 2018 21:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68210
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for gcc 9.
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Subject: [Bug c++/86915] New: Segmentation fault for an array of auto in template parameter
Date: Sat, 11 Aug 2018 00:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86915
Bug ID: 86915
Summary: Segmentation fault for an array of auto in template
parameter
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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/********** BEGIN SOURCE **********/
template<auto[1]> struct S;
/*********** END SOURCE ***********/
'
Segmentation fault
1 | template<auto[1]> struct S;
| ^
Tested with 9.0.0 20180809 (experimental)
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Subject: [Bug libstdc++/86910] std::filesystem::create_directories doesn't set error code or throw while violating postcondition.
Date: Sat, 11 Aug 2018 05:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86910
--- Comment #3 from Steffen Schuemann <ssh at pobox dot com> ---
Sorry, g++-8 -v:
Using built-in specs.
COLLECT_GCC=g++-8
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
8-20180414-1ubuntu2' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --with-as=/usr/bin/x86_64-linux-gnu-as
--with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-8
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 8.0.1 20180414 (experimental) [trunk revision 259383] (Ubuntu
8-20180414-1ubuntu2)
I see, that LWG defect 2935 addresses this question. But first, my
understanding is a defect in WP status is still not part of the standard, so it
might become part of some C++20 or some TC, but it currently doesn't seem to be
part of C++17 (selected by -std=c++17). I might be wrong with that.
And second, I still I don't really see how this is expected to be used by the
developers usinf std::fs. Without that postcondition you have to do a check for
the directory before using that it, so the "spared" call was simply moved to
the user code. Not testing could lead to harder to track down bugs later on in
a different domain of the software.
And third, as testing for existence and type can be done with one call, I don't
see the issue raised in the defect about additional system calls in the
implementation on Windows and POSIX. I found this issue while implementing a
closely C++17 compatible filesystem for C++11/14 level compilers on Windows and
POSIX and simply ran my (still growing) test suite against GCCs std::fs where
that case failed, so I thought I just report it. ;-)
I didn't need any extra system calls to detect that situation in my (wip)
implementation. So I just looked into
https://github.com/gcc-mirror/gcc/blob/a2809afdf9560accb06cdb595ce20e32f652a75c/libstdc%2B%2B-v3/src/filesystem/std-ops.cc#L652-L665
and when the fs::file_status result of the fs::status(pp, ec) call tracking the
file_type::not_found elements would have been keept, the
fs::is_directory(s)-call on that last file_status would have been free of any
additional system calls.
Well, this might not be the place to discuss the LWG decision, it just doesn't
look like a helpfull one to me, and it feels like beeing taken based on a false
assumtion about the implementation, so it hurts and it converts a supposed
system call actually not needed to a definitive system call on the user side.
I guess I stick to the current C++17 descritpion and keep the error reporting,
as it seems the way to go for me, and it's still good to know I need to take
care on other implementations, but as I would use the compiler given std::fs
whereever I can (I just don't allways have it), I sure would prefer it to
follow the original wording.
Thank you for pointing me on that LWG defect!
>From gcc-bugs-return-612532-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 07:46:56 2018
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Subject: [Bug ada/86916] New: 8.1.0 (x86_64-apple-darwin15) Constraint_Error erroneous memory access
Date: Sat, 11 Aug 2018 07:46:00 -0000
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Bug ID: 86916
Summary: 8.1.0 (x86_64-apple-darwin15) Constraint_Error
erroneous memory access
Product: gcc
Version: 8.1.0
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Created attachment 44525
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44525&action=edit
Requested files
Command (via GPS):
gprbuild -d
-P/Ada_Source/OglAda_Examples/ogl_dev/22_loading_test/loader_test.gpr
-XMode=debug -XLibrary_Type=static -XAuto_Exceptions=enabled
-XWindowing_System=quartz -XGLFW_Version=3 -s --config=/Ada_Source/default.cgpr
compilation abandoned
gprbuild: *** compilation phase failed
[2018-08-11 17:27:28] process exited with status 4, 93% (117/125), elapsed
time: 28.32s
+===========================GNAT BUG DETECTED==============================+
| 8.1.0 (x86_64-apple-darwin15) Constraint_Error erroneous memory access |
| Error detected at animation.adb:61:16 |
| Please submit a bug report; see https://gcc.gnu.org/bugs/ . |
| Use a subject line meaningful to you and us to track the bug. |
| Include the entire contents of this bug box in the report. |
| Include the exact command that you entered. |
| Also include sources listed below. |
+==========================================================================+
List of files
compilation abandoned
gprbuild: *** compilation phase failed
[2018-08-11 17:27:28] process exited with status 4, 93% (117/125), elapsed
time: 28.32s
>From gcc-bugs-return-612533-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 08:26:23 2018
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Subject: [Bug libstdc++/86910] std::filesystem::create_directories doesn't set error code or throw while violating postcondition.
Date: Sat, 11 Aug 2018 08:26:00 -0000
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--- Comment #4 from Steffen Schuemann <ssh at pobox dot com> ---
I just realised, if I'm all wrong, and not handling this as an error is the way
to go, as described in LWG-defect-#2935, create_directory() would violate the
new behaviour described in 2935, as it passes my unit tests so it throws an
exception if a file with that name exists. One way or the other, something
doesn't match (also verified on g++ 8.1.0 on macOS and by looking into the
code).
>From gcc-bugs-return-612534-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 10:42:22 2018
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Subject: [Bug tree-optimization/86858] [9 Regression] GCC ICE at -O3 in as_a, at is-a.h:197
Date: Sat, 11 Aug 2018 10:42:00 -0000
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Fixed. Thanks for the bug report.
>From gcc-bugs-return-612535-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 10:47:41 2018
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Subject: [Bug c++/86728] [7/8/9 Regression] unexpected error: conversion from '<lambda(<type error>, ...)>' to non-scalar type 'std::function<void(int)>' requested
Date: Sat, 11 Aug 2018 10:47:00 -0000
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--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Sat Aug 11 10:47:03 2018
New Revision: 263484
URL: https://gcc.gnu.org/viewcvs?rev=263484&root=gcc&view=rev
Log:
PR c++/86728 - C variadic generic lambda.
* parser.c (cp_parser_parameter_declaration): Don't turn 'auto' into
a pack if it's followed by a declarator-id.
Added:
trunk/gcc/testsuite/g++.dg/cpp1y/lambda-generic-variadic19.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
>From gcc-bugs-return-612536-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 10:55:54 2018
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Subject: [Bug tree-optimization/86884] aggressive loop optimization and effective type
Date: Sat, 11 Aug 2018 10:55:00 -0000
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Martin Uecker <uecker at eecs dot berkeley.edu> changed:
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----------------------------------------------------------------------------
CC| |uecker at eecs dot berkeley.edu
--- Comment #1 from Martin Uecker <uecker at eecs dot berkeley.edu> ---
Here are some additional comments, which may help to analyze this (or not).
The optimization also works without struct Y, the initialization, and the
memcpy in which case the example is not undefined by itself (see case 1 below).
From a C language point of view (I can't comment about GIMPLE), the
optimization seems legal as from the access p->c one can infer the effective
type. In case 3, one cannot infer the effective type and gcc also does not
optimize this case. Case 2 is interesting. I think using p->c to construct a
pointer to c implies that the storage at p must have correct effective type,
but I am not entirely sure. For strlen, case 1 and case 2 are optimized, but
not case 3. (tested with gcc from recent git).
#include <string.h>
#include <stddef.h>
#include <stdlib.h>
struct X { int i; char c[4]; int j;};
void f(struct X *p)
{
int n = 0;
#if 1
// case 1
while (p->c[n]) // uncond. abort
++n;
#else
#if 1
// case 2
char* pc = p->c; // no uncond. abort
#else
// case 3
char* pc = (char*)p + offsetof(struct X, c); // no uncond. abort
#endif
while (pc[n])
++n;
#endif
if (n < 7)
abort();
}
void g(struct X *p)
{
int n = 0;
#if 1
// case 1
n = strlen(p->c); // uncond. abort
#else
#if 1
// case 2
char* pc = p->c; // uncond. abort
#else
// case 3
char* pc = (char*)p + offsetof(struct X, c); // no uncond. abort
#endif
n = strlen(pc);
#endif
if (n < 7)
abort();
}
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Subject: [Bug c++/86728] [7/8/9 Regression] unexpected error: conversion from '<lambda(<type error>, ...)>' to non-scalar type 'std::function<void(int)>' requested
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--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Sat Aug 11 11:02:22 2018
New Revision: 263486
URL: https://gcc.gnu.org/viewcvs?rev=263486&root=gcc&view=rev
Log:
PR c++/86728 - C variadic generic lambda.
* parser.c (cp_parser_parameter_declaration): Don't turn 'auto' into
a pack if it's followed by a declarator-id.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/cpp1y/lambda-generic-variadic19.C
Modified:
branches/gcc-7-branch/gcc/cp/ChangeLog
branches/gcc-7-branch/gcc/cp/parser.c
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Subject: [Bug c++/86728] [7/8/9 Regression] unexpected error: conversion from '<lambda(<type error>, ...)>' to non-scalar type 'std::function<void(int)>' requested
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--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Sat Aug 11 11:01:49 2018
New Revision: 263485
URL: https://gcc.gnu.org/viewcvs?rev=263485&root=gcc&view=rev
Log:
PR c++/86728 - C variadic generic lambda.
* parser.c (cp_parser_parameter_declaration): Don't turn 'auto' into
a pack if it's followed by a declarator-id.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/cpp1y/lambda-generic-variadic19.C
Modified:
branches/gcc-8-branch/gcc/cp/ChangeLog
branches/gcc-8-branch/gcc/cp/parser.c
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86728] [7/8/9 Regression] unexpected error: conversion from '<lambda(<type error>, ...)>' to non-scalar type 'std::function<void(int)>' requested
Date: Sat, 11 Aug 2018 11:03:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/86835] [8/9 Regression] Bogus "is used uninitialized" warning with -ffast-math
Date: Sat, 11 Aug 2018 11:29:00 -0000
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Sat Aug 11 11:29:12 2018
New Revision: 263487
URL: https://gcc.gnu.org/viewcvs?rev=263487&root=gcc&view=rev
Log:
PR tree-optimization/86835
* tree-ssa-math-opts.c (insert_reciprocals): Even when inserting
new_stmt after def_gsi, make sure to insert new_square_stmt after
that stmt, not 2 stmts before it.
* gcc.dg/pr86835.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr86835.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-math-opts.c
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From: "even.rouault at spatialys dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/86914] gcc 8.1 -O2 generates wrong code with strlen() of pointers within one-element arrays of structures
Date: Sat, 11 Aug 2018 12:05:00 -0000
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--- Comment #1 from Even Rouault <even.rouault at spatialys dot com> ---
Interstingly with gcc 8.2, char c[0] doesn't generate the appropriate code. The
only way of making it work is to use char c[] syntax
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From: "rogermc at iinet dot net.au" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ada/86916] 8.1.0 (x86_64-apple-darwin15) Constraint_Error erroneous memory access
Date: Sat, 11 Aug 2018 12:16:00 -0000
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--- Comment #1 from Roger Mc Murtrie <rogermc at iinet dot net.au> ---
I am also getting this problem with gcc 6.1.0
+===========================GNAT BUG DETECTED==============================+
| 6.1.0 (x86_64-apple-darwin15) GCC error: |
| in gnat_to_gnu_entity, at ada/gcc-interface/decl.c:3011 |
| Error detected at assimp_texture.ads:65:34
As I have used gcc 6.1.0 with getting this error in the past I'm wondering if
it has something to do with OSX.
Mac mini (Mid 2011)
OSX 10.13.6
Xcode 9.4.1
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Subject: [Bug ada/86916] 8.1.0 (x86_64-apple-darwin15) Constraint_Error erroneous memory access
Date: Sat, 11 Aug 2018 12:21:00 -0000
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--- Comment #2 from Roger Mc Murtrie <rogermc at iinet dot net.au> ---
Correction
"As I have used gcc 6.1.0 with getting this error"
should have been:
"As I have used gcc 6.1.0 WITHOUT getting this error"
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From: "hans.buchmann at fhnw dot ch" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86917] New: ICE in verify_ctor_sanity, at cp/constexpr.c:2798
Date: Sat, 11 Aug 2018 14:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86917
Bug ID: 86917
Summary: ICE in verify_ctor_sanity, at cp/constexpr.c:2798
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hans.buchmann at fhnw dot ch
Target Milestone: ---
Created attachment 44526
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44526&action=edit
The Bug
Compiling the (wrong) code
------8<------8<------8<------8<------8<------8<------8<------
struct Byte
{
constexpr Byte():c(0){}
static const Byte Zero;
unsigned c;
};
struct Word
{
typedef Byte W[4];
constexpr Word():w({Byte::Zero,Byte::Zero,Byte::Zero,Byte::Zero}){}
W w;
};
struct AES256
{
AES256();
Word w[60];
};
AES256::AES256()
{
}
------8<------8<------8<------8<------8<------8<------8<------
with
g++ -c -o bug.o bug.cc
results in:
------8<------8<------8<------8<------8<------8<------8<------
bug.cc: In constructor \u2018AES256::AES256()\u2019:
bug.cc:21:16: in \u2018constexpr\u2019 expansion of \u2018Word()\u2019
bug.cc:21:16: internal compiler error: in verify_ctor_sanity, at
cp/constexpr.c:2798
AES256::AES256()
^
Please submit a full bug report,
with preprocessed source if appropriate.
------8<------8<------8<------8<------8<------8<------8<------
g++ -v
------8<------8<------8<------8<------8<------8<------8<------
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib \
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info \
--with-bugurl=https://bugs.archlinux.org/ \
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ \
--enable-shared --enable-threads=posix --enable-libmpx \
--with-system-zlib --with-isl --enable-__cxa_atexit \
--disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch \
--disable-libssp --enable-gnu-unique-object --enable-linker-build-id \
--enable-lto --enable-plugin --enable-install-libiberty
--with-linker-hash-style=gnu\
--enable-gnu-indirect-function --enable-multilib --disable-werror \
--enable-checking=release --enable-default-pie --enable-default-ssp
--enable-cet=auto
Thread model: posix
gcc version 8.2.0 (GCC)
------8<------8<------8<------8<------8<------8<------8<------
Sincerely
Hans Buchmann
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86917] [6/7/8/9 Regression] ICE in verify_ctor_sanity, at cp/constexpr.c:2798
Date: Sat, 11 Aug 2018 14:55:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-11
CC| |mpolacek at gcc dot gnu.org
Summary|ICE in verify_ctor_sanity, |[6/7/8/9 Regression] ICE
|at cp/constexpr.c:2798 |in verify_ctor_sanity, at
| |cp/constexpr.c:2798
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed, thanks for reporting.
G++ 5 works.
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Subject: [Bug c++/86917] [6/7/8/9 Regression] ICE in verify_ctor_sanity, at cp/constexpr.c:2798
Date: Sat, 11 Aug 2018 14:57:00 -0000
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with Merge C++ delayed folding branch., r230365.
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From: "staticfloat at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/81033] [8/9 Regression] there are cases where ld64 is not able to determine correct atom boundaries from the output GCC currently produces
Date: Sat, 11 Aug 2018 15:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81033
Elliot Saba <staticfloat at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |staticfloat at gmail dot com
--- Comment #41 from Elliot Saba <staticfloat at gmail dot com> ---
Has there been any progress on this? We are running into this while trying to
cross-compile GCC for Darwin. Has this been fixed in 8.3.0?
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86915] Segmentation fault for an array of auto in template parameter
Date: Sat, 11 Aug 2018 15:10:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-invalid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-11
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed, doesn't seem like a regression.
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Subject: [Bug c++/86915] Segmentation fault for an array of auto in template parameter
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/86835] [8 Regression] Bogus "is used uninitialized" warning with -ffast-math
Date: Sat, 11 Aug 2018 16:44:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[8/9 Regression] Bogus "is |[8 Regression] Bogus "is
|used uninitialized" warning |used uninitialized" warning
|with -ffast-math |with -ffast-math
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed on the trunk so far.
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/86914] [8/9 Regression] -O2 generates wrong code with strlen() of pointers within one-element arrays of structures
Date: Sat, 11 Aug 2018 17:58:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-11
CC| |law at redhat dot com,
| |msebor at gcc dot gnu.org
Summary|gcc 8.1 -O2 generates wrong |[8/9 Regression] -O2
|code with strlen() of |generates wrong code with
|pointers within one-element |strlen() of pointers within
|arrays of structures |one-element arrays of
| |structures
Ever confirmed|0 |1
Known to fail| |8.2.0, 9.0
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed. Most likely caused by r255790.
The strlen pass sees:
_1 = &MEM[(void *)p_3(D) + 5B];
_2 = __builtin_strlen (_1);
The code in maybe_set_strlen_range() tries to avoid using the size of the last
member array (GCC treats all such arrays as flexible array members) by checking
the result of array_at_struct_end_p() but the function doesn't handle MEM_REF
and returns false. The optimization is disabled if the array is a bona fide
C11 flexible array member because the size of such an array is unknown.
Enhancing array_at_struct_end_p() to deal with MEM_REF or adding an
array_not_at_struct_end_p() that returns a conservative result would fix this
but the strlen range optimization will likely be disabled regardless.
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Subject: [Bug tree-optimization/86914] [8/9 Regression] -O2 generates wrong code with strlen() of pointers within one-element arrays of structures
Date: Sat, 11 Aug 2018 17:58:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |ASSIGNED
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Let me handle this.
>From gcc-bugs-return-612553-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 19:13:39 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/78917] missing -Wnonnull passing null to a nonnull function
Date: Sat, 11 Aug 2018 19:13:00 -0000
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--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Another test case:
$ cat f.c && gcc -O2 -S -Wall -Wextra f.c
int f (int i)
{
const char * p = __builtin_strchr (i ? "123" : "456", '2');
return __builtin_strlen (p);
}
The strlen argument is a phi with a null operand so that should make it easy to
detect:
# prephitmp_11 = PHI <_10(3), 0B(2)>
_1 = __builtin_strlen (prephitmp_11);
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/86846] [9 Regression] ld: (Warning) Unsatisfied symbol "__atomic_exchange_8" in libstdc++.sl
Date: Sat, 11 Aug 2018 19:31:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Does hppa64 really not have native atomic ops for sizeof(void*) ?
I guess we need to use a mutex here, as I don't want libstdc++ to depend on
libatomic.
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Subject: [Bug tree-optimization/80334] [5 Regression] Segfault when taking address of copy of unaligned struct
Date: Sat, 11 Aug 2018 19:32:00 -0000
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |aoliva at gcc dot gnu.org
--- Comment #11 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
FWIW, this testcase still fails with unaligned accesses in the trunk:
#ifndef T
# define T long
#endif
#ifndef R
# define R "r"
#endif
typedef T A; // #define T to long or __int128
struct B { char d; A c; } __attribute__((packed));
B b[50]; // many elements to avoid loop unrolling
int main () {
for (int i = 0; i < sizeof(b) / sizeof(*b); i++) {
asm ("" : "+" R (b[i].unpacked)); // #define R to "r" on ppc or "x" on
x86_64
}
}
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Subject: [Bug tree-optimization/80334] [5 Regression] Segfault when taking address of copy of unaligned struct
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--- Comment #12 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Created attachment 44527
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44527&action=edit
candidate patch to fix the error noted in comment 11
This patch fixes the unaligned accesses in the testcase in comment 11. I
haven't yet tested it otherwise.
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Subject: [Bug c/85704] [8/9 Regression] cc1 run out of memory when it compile
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug middle-end/86627] [6/7 Regression] Signed 128-bit division by 2 no longer expanded to RTL
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[6/7/8/9 Regression] Signed |[6/7 Regression] Signed
|128-bit division by 2 no |128-bit division by 2 no
|longer expanded to RTL |longer expanded to RTL
--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 8.3+.
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Subject: [Bug c++/86738] [8 Regression] gcc 8.2: Internal compiler error memcpy
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[8/9 Regression] gcc 8.2: |[8 Regression] gcc 8.2:
|Internal compiler error |Internal compiler error
|memcpy |memcpy
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed on the trunk so far.
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Subject: [Bug libstdc++/86846] [9 Regression] ld: (Warning) Unsatisfied symbol "__atomic_exchange_8" in libstdc++.sl
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
Target Milestone|--- |9.0
>From gcc-bugs-return-612561-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 19:46:06 2018
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Subject: [Bug c++/86569] [6/7/8 Regression] -Wnonnull-compare affects code generation since r233684
Date: Sat, 11 Aug 2018 19:46:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[6/7/8/9 Regression] |[6/7/8 Regression]
|-Wnonnull-compare affects |-Wnonnull-compare affects
|code generation since |code generation since
|r233684 |r233684
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed on the trunk so far.
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Subject: [Bug libstdc++/86846] [9 Regression] ld: (Warning) Unsatisfied symbol "__atomic_exchange_8" in libstdc++.sl
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--- Comment #2 from dave.anglin at bell dot net ---
On 2018-08-11 3:31 PM, redi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86846
>
> --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
> Does hppa64 really not have native atomic ops for sizeof(void*) ?
Sadly, it lacks an atomic compare and exchange operation. The mutex
support might have some form
of kernel support but I don't know what it is.
I've been working on atomic load and store support.
>
> I guess we need to use a mutex here, as I don't want libstdc++ to depend on
> libatomic.
>
Yes.
Dave
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Subject: [Bug c++/86918] New: internal compiler error: unexpected expression 'v' of kind template_parm_index
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Bug ID: 86918
Summary: internal compiler error: unexpected expression 'v' of
kind template_parm_index
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/****************** BEGIN SOURCE ******************/
template<class>
struct S {
template<bool...>
struct X;
};
template<>
template<bool v>
struct S<int>::X {
static constexpr bool value = v;
};
static_assert(S<int>::X<true>::value);
/******************* END SOURCE *******************/
<source>: In instantiation of 'struct S<int>::X<true>':
<source>:13:30: required from here
<source>:9:18: internal compiler error: unexpected expression 'v' of kind
template_parm_index
9 | struct S<int>::X {
| ^
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86846
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
N.B. this doesn't need compare and exchange, just exchange.
I'll fix this early next week.
>From gcc-bugs-return-612565-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 20:13:59 2018
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From: "danglin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/86599] Problems building libgfortran from 7.2.0 on HP-UX 11.31/PA
Date: Sat, 11 Aug 2018 20:13:00 -0000
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John David Anglin <danglin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |danglin at gcc dot gnu.org
--- Comment #9 from John David Anglin <danglin at gcc dot gnu.org> ---
I don't have a 11.31 system, so you will probably have to work out and test the
fix.
The hpux_long_double hack does two things. It comments out the _LONG_DOUBLE
define and changes "long_double" to "long double".
Steve Ellcey disabled it for 11.31 and added the hpux_long_double_2 hack
for 11.31.
>From the build error, it looks like 11.31 needs a hack to change "long_double"
to "long double".
It would help to see the uses of long_double in stdlib.h.
>From gcc-bugs-return-612566-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 20:21:51 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/86919] New: strlen of a multidimensional array element with non-constant offset not folded
Date: Sat, 11 Aug 2018 20:21:00 -0000
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Bug ID: 86919
Summary: strlen of a multidimensional array element with
non-constant offset not folded
Product: gcc
Version: 9.0
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GCC 9 folds the first of the strlen() calls below where the first index into
the array is a literal constant into an efficient expression but it misses the
same opportunity in the second call where the index is a variable with a known
value. (GCC 8folds neither.)
$ cat f.c && gcc -O2 -S -Wall -Wextra -Wnull-dereference
-fdump-tree-optimized=/dev/stdout f.c
const char b[][5] = { "123", "1234" };
int f (int j)
{
return __builtin_strlen (&b[0][j]); // folded to 3 - i
}
int g (int j)
{
int i = 0;
return __builtin_strlen (&b[i][j]); // not folded
}
;; Function f (f, funcdef_no=0, decl_uid=1906, cgraph_uid=1, symbol_order=1)
Removing basic block 5
f (int j)
{
unsigned int j.1_1;
unsigned int _2;
int iftmp.0_3;
int iftmp.0_5;
<bb 2> [local count: 1073741825]:
if (j_4(D) <= 3)
goto <bb 3>; [50.00%]
else
goto <bb 4>; [50.00%]
<bb 3> [local count: 536870912]:
j.1_1 = (unsigned int) j_4(D);
_2 = 3 - j.1_1;
iftmp.0_5 = (int) _2;
<bb 4> [local count: 1073741825]:
# iftmp.0_3 = PHI <iftmp.0_5(3), 0(2)>
return iftmp.0_3;
}
;; Function g (g, funcdef_no=1, decl_uid=1909, cgraph_uid=2, symbol_order=2)
g (int j)
{
const char * _1;
long unsigned int _2;
int _5;
sizetype _6;
<bb 2> [local count: 1073741825]:
_6 = (sizetype) j_3(D);
_1 = &b + _6;
_2 = __builtin_strlen (_1);
_5 = (int) _2;
return _5;
}
>From gcc-bugs-return-612567-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 20:23:18 2018
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Subject: [Bug c++/86920] New: A matching template specialization is not selected
Date: Sat, 11 Aug 2018 20:23:00 -0000
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Bug ID: 86920
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/****************** BEGIN SOURCE ******************/
template<class>
struct S {
template<bool...>
struct X {
static constexpr bool value = false;
};
};
template<>
template<bool v>
struct S<int>::X<v> {
static constexpr bool value = true;
};
static_assert(S<int>::X<true>::value);
/******************* END SOURCE *******************/
EXPECTED: no errors
ACTUAL:
<source>:15:15: error: static assertion failed
15 | static_assert(S<int>::X<true>::value);
| ^~~~~~
>From gcc-bugs-return-612569-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 20:33:44 2018
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Subject: [Bug libstdc++/86910] std::filesystem::create_directories doesn't set error code or throw while violating postcondition.
Date: Sat, 11 Aug 2018 20:33:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|WAITING |NEW
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Steffen Schuemann from comment #3)
> gcc version 8.0.1 20180414 (experimental) [trunk revision 259383] (Ubuntu
> 8-20180414-1ubuntu2)
Why are you using a pre-release snapshot from 4 months ago when the 8.1 and 8.2
releases have been made since then?
> I see, that LWG defect 2935 addresses this question. But first, my
> understanding is a defect in WP status is still not part of the standard, so
> it might become part of some C++20 or some TC, but it currently doesn't seem
> to be part of C++17 (selected by -std=c++17). I might be wrong with that.
It's a defect in C++17. We implement the fixes, not implement a standard that
is known to be defective. Why would you want a pedantic adherence to a
defective standard? Do you also want compiler bugs to go unfixed, because they
were present in past releases? :-)
Anyway, the manual says what -std=c++17 means:
"The 2017 ISO C++ standard plus amendments."
https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html
> And second, I still I don't really see how this is expected to be used by
> the developers usinf std::fs. Without that postcondition you have to do a
> check for the directory before using that it, so the "spared" call was
> simply moved to the user code. Not testing could lead to harder to track
> down bugs later on in a different domain of the software.
Yes, I agree. I don't think pushing the is_directory check onto users is
helpful, but that's what the Defect Report resolution says. I was discussing it
recently with the developer of libc++'s std::filesystem implementation and I
think we both fail to meet the spec for create_directory (as you noted in
comment 4). I'm not sure what libc++ does for create_directories.
I haven't changed create_directory, because I like its current behaviour. I
haven't changed create_directories because it was accidentally already doing
what 2935 wants, and intentionally changing to disagree with the spec seems
wrong. i.e. inertia has won.
> And third, as testing for existence and type can be done with one call,
That's true for my implementation of create_directories, but not for
create_directory, where you don't need to test for existence. You call mkdir
and if it returns EEXIST you know it already exists. To see if it's a directory
requires another system call (which I currently do).
I've now asked the standard committee to reconsider whether we made the right
call on 2935.
I'll confirm this, because whatever happens create_directory and
create_directories should be consistent, so I'll need to change one of them.
>From gcc-bugs-return-612568-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 20:33:12 2018
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Subject: [Bug target/86599] Problems building libgfortran from 7.2.0 on HP-UX 11.31/PA
Date: Sat, 11 Aug 2018 20:33:00 -0000
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--- Comment #10 from The Written Word <bugzilla-gcc at thewrittenword dot com> ---
(In reply to John David Anglin from comment #9)
> It would help to see the uses of long_double in stdlib.h.
/usr/include/stdlib.h has:
# ifndef _LONG_DOUBLE
# define _LONG_DOUBLE
# if !defined(__ia64) || !defined(_PROTOTYPES) || defined(_LONG_DOUBLE_STRUCT)
typedef struct {
uint32_t word1, word2, word3, word4;
} long_double;
extern long_double strtold __((const char * __restrict, char ** __restrict));
# else /* !__ia64 || !_PROTOTYPES || _LONG_DOUBLE_STRUCT */
# ifdef _INCLUDE_HPUX_SOURCE
typedef long double long_double;
# endif /* _INCLUDE_HPUX_SOURCE */
extern long double strtold __((const char * __restrict, char ** __restrict));
# endif /* !__ia64 ||!_PROTOTYPES ||_LONG_DOUBLE_STRUCT */
#endif /* _LONG_DOUBLE */
>From gcc-bugs-return-612570-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 21:03:43 2018
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Subject: [Bug tree-optimization/86829] Missing sin(atan(x)) and cos(atan(x)) optimizations
Date: Sat, 11 Aug 2018 21:03:00 -0000
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |manu at gcc dot gnu.org
--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Giuliano Belinassi from comment #3)
> (In reply to Marc Glisse from comment #1)
> >
> > Do you have a copyright assignment (https://gcc.gnu.org/contribute.html) ?
>
> No. Sorry, but I think I may need help getting this right. Are there any
> tips?
https://gcc.gnu.org/wiki/GettingStarted#Basics:_Contributing_to_GCC_in_10_easy_steps
>From gcc-bugs-return-612571-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 21:25:06 2018
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Subject: [Bug target/86599] Problems building libgfortran from 7.2.0 on HP-UX 11.31/PA
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--- Comment #11 from The Written Word <bugzilla-gcc at thewrittenword dot com> ---
Created attachment 44528
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44528&action=edit
stdlib.h long_double patch
>From gcc-bugs-return-612572-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 21:25:29 2018
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From: "bugzilla-gcc at thewrittenword dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86599] Problems building libgfortran from 7.2.0 on HP-UX 11.31/PA
Date: Sat, 11 Aug 2018 21:25:00 -0000
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--- Comment #12 from The Written Word <bugzilla-gcc at thewrittenword dot com> ---
(In reply to The Written Word from comment #11)
> Created attachment 44528 [details]
> stdlib.h long_double patch
My first attempt but it didn't work.
>From gcc-bugs-return-612573-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 21:51:50 2018
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Subject: [Bug target/86599] Problems building libgfortran from 7.2.0 on HP-UX 11.31/PA
Date: Sat, 11 Aug 2018 21:51:00 -0000
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--- Comment #13 from The Written Word <bugzilla-gcc at thewrittenword dot com> ---
(In reply to The Written Word from comment #10)
> (In reply to John David Anglin from comment #9)
> > It would help to see the uses of long_double in stdlib.h.
>
> /usr/include/stdlib.h has:
>
> # ifndef _LONG_DOUBLE
> # define _LONG_DOUBLE
> # if !defined(__ia64) || !defined(_PROTOTYPES) ||
> defined(_LONG_DOUBLE_STRUCT)
> typedef struct {
> uint32_t word1, word2, word3, word4;
> } long_double;
> extern long_double strtold __((const char * __restrict, char ** __restrict));
> # else /* !__ia64 || !_PROTOTYPES || _LONG_DOUBLE_STRUCT */
> # ifdef _INCLUDE_HPUX_SOURCE
> typedef long double long_double;
> # endif /* _INCLUDE_HPUX_SOURCE */
> extern long double strtold __((const char * __restrict, char ** __restrict));
> # endif /* !__ia64 ||!_PROTOTYPES ||_LONG_DOUBLE_STRUCT */
> #endif /* _LONG_DOUBLE */
I think the problem on 11.31 is that the strtold() definition is in the above.
We can't simply remove it all and change long_double->long double in the
remainder of the file to get the function definition changed.
>From gcc-bugs-return-612574-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 21:56:16 2018
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From: "bugzilla-gcc at thewrittenword dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86599] Problems building libgfortran from 7.2.0 on HP-UX 11.31/PA
Date: Sat, 11 Aug 2018 21:56:00 -0000
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--- Comment #14 from The Written Word <bugzilla-gcc at thewrittenword dot com> ---
(In reply to The Written Word from comment #13)
> (In reply to The Written Word from comment #10)
> > (In reply to John David Anglin from comment #9)
> > > It would help to see the uses of long_double in stdlib.h.
> >
> > /usr/include/stdlib.h has:
> >
> > # ifndef _LONG_DOUBLE
> > # define _LONG_DOUBLE
> > # if !defined(__ia64) || !defined(_PROTOTYPES) ||
> > defined(_LONG_DOUBLE_STRUCT)
> > typedef struct {
> > uint32_t word1, word2, word3, word4;
> > } long_double;
> > extern long_double strtold __((const char * __restrict, char ** __restrict));
> > # else /* !__ia64 || !_PROTOTYPES || _LONG_DOUBLE_STRUCT */
> > # ifdef _INCLUDE_HPUX_SOURCE
> > typedef long double long_double;
> > # endif /* _INCLUDE_HPUX_SOURCE */
> > extern long double strtold __((const char * __restrict, char ** __restrict));
> > # endif /* !__ia64 ||!_PROTOTYPES ||_LONG_DOUBLE_STRUCT */
> > #endif /* _LONG_DOUBLE */
>
> I think the problem on 11.31 is that the strtold() definition is in the
> above. We can't simply remove it all and change long_double->long double in
> the remainder of the file to get the function definition changed.
Hmm, maybe two new rules, the first to remove everything before "extern long
double strtold" and change long_double->long double and the second to remove
the two lines after "extern long double strtold". Let me try to come up with
something.
>From gcc-bugs-return-612575-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 21:58:24 2018
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From: "dave.anglin at bell dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86599] Problems building libgfortran from 7.2.0 on HP-UX 11.31/PA
Date: Sat, 11 Aug 2018 21:58:00 -0000
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--- Comment #15 from dave.anglin at bell dot net ---
On 2018-08-11 5:51 PM, bugzilla-gcc at thewrittenword dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86599
>
> --- Comment #13 from The Written Word <bugzilla-gcc at thewrittenword dot com> ---
> (In reply to The Written Word from comment #10)
>> (In reply to John David Anglin from comment #9)
>>> It would help to see the uses of long_double in stdlib.h.
>> /usr/include/stdlib.h has:
>>
>> # ifndef _LONG_DOUBLE
>> # define _LONG_DOUBLE
>> # if !defined(__ia64) || !defined(_PROTOTYPES) ||
>> defined(_LONG_DOUBLE_STRUCT)
>> typedef struct {
>> uint32_t word1, word2, word3, word4;
>> } long_double;
>> extern long_double strtold __((const char * __restrict, char ** __restrict));
>> # else /* !__ia64 || !_PROTOTYPES || _LONG_DOUBLE_STRUCT */
>> # ifdef _INCLUDE_HPUX_SOURCE
>> typedef long double long_double;
>> # endif /* _INCLUDE_HPUX_SOURCE */
>> extern long double strtold __((const char * __restrict, char ** __restrict));
>> # endif /* !__ia64 ||!_PROTOTYPES ||_LONG_DOUBLE_STRUCT */
>> #endif /* _LONG_DOUBLE */
> I think the problem on 11.31 is that the strtold() definition is in the above.
> We can't simply remove it all and change long_double->long double in the
> remainder of the file to get the function definition changed.
You could replace the above with prototype for strtold().
>From gcc-bugs-return-612576-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 11 21:59:59 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/86846] [9 Regression] ld: (Warning) Unsatisfied symbol "__atomic_exchange_8" in libstdc++.sl
Date: Sat, 11 Aug 2018 21:59:00 -0000
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--- Comment #4 from dave.anglin at bell dot net ---
On 2018-08-11 4:08 PM, redi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86846
>
> --- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
> N.B. this doesn't need compare and exchange, just exchange.
There also isn't exchange operation. :-(
>From gcc-bugs-return-612577-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 00:03:37 2018
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Subject: [Bug c++/86920] A matching template specialization is not selected
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-12
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Confirmed. Not a regression as far as I can tell.
>From gcc-bugs-return-612578-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 00:04:33 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/86846] [9 Regression] ld: (Warning) Unsatisfied symbol "__atomic_exchange_8" in libstdc++.sl
Date: Sun, 12 Aug 2018 00:04:00 -0000
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This should do it:
--- a/libstdc++-v3/src/c++17/memory_resource.cc
+++ b/libstdc++-v3/src/c++17/memory_resource.cc
@@ -25,6 +25,7 @@
#include <memory_resource>
#include <atomic>
#include <new>
+#include <bits/std_mutex.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
@@ -81,7 +82,31 @@ namespace pmr
constant_init<newdel_res_t> newdel_res{};
constant_init<null_res_t> null_res{};
+#if ATOMIC_POINTER_LOCK_FREE == 2
constant_init<atomic<memory_resource*>> default_res{&newdel_res.obj};
+#else
+ struct locking_atomic
+ {
+ constexpr locking_atomic(memory_resource* r) : val(r) { }
+ mutex mx;
+ memory_resource* val;
+
+ memory_resource* load()
+ {
+ lock_guard<mutex> lock(mx);
+ return val;
+ }
+
+ memory_resource* exchange(memory_resource* r)
+ {
+ lock_guard<mutex> lock(mx);
+ auto prev = val;
+ val = r;
+ return prev;
+ }
+ };
+ constant_init<locking_atomic> default_res{&newdel_res.obj};
+#endif
} // namespace
memory_resource*
>From gcc-bugs-return-612579-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 00:16:29 2018
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Subject: [Bug libstdc++/86846] [9 Regression] ld: (Warning) Unsatisfied symbol "__atomic_exchange_8" in libstdc++.sl
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--- Comment #6 from dave.anglin at bell dot net ---
On 2018-08-11 8:04 PM, redi at gcc dot gnu.org wrote:
> This should do it:
I'll give it a test on my next build.
Thanks,
Dave
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Subject: [Bug ada/86916] 8.1.0 (x86_64-apple-darwin15) Constraint_Error erroneous memory access
Date: Sun, 12 Aug 2018 01:50:00 -0000
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--- Comment #3 from Roger Mc Murtrie <rogermc at iinet dot net.au> ---
This problem doesn't occur for compile only.
It occurs when I Build All from GPS
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From: "yamirenk at ya dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86921] New: do not remove input in bash
Date: Sun, 12 Aug 2018 08:25:00 -0000
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Bug ID: 86921
Summary: do not remove input in bash
Product: gcc
Version: 6.3.0
Status: UNCONFIRMED
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Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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when the second line begins. symbols, entered in first line, does not
remove(with
backspace).
for example: "cin >> init;"
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Subject: [Bug fortran/86906] erroneous name clash with renaming in use statement
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--- Comment #1 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Sun Aug 12 10:55:13 2018
New Revision: 263494
URL: https://gcc.gnu.org/viewcvs?rev=263494&root=gcc&view=rev
Log:
2018-08-12 Paul Thomas <pault@gcc.gnu.org>
PR fortran/86906
* resolve.c (resolve_fl_variable_derived): Check if the derived
type is use associated before checking for the host association
error.
2018-08-12 Paul Thomas <pault@gcc.gnu.org>
PR fortran/86906
* gfortran.dg/use_rename_9.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/use_rename_9.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/resolve.c
trunk/gcc/testsuite/ChangeLog
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Paul Thomas <pault at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-12
CC| |pault at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |pault at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Paul Thomas <pault at gcc dot gnu.org> ---
I will commit to 8-branch as well.
Paul
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Subject: [Bug target/86599] Problems building libgfortran from 7.2.0 on HP-UX 11.31/PA
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--- Comment #16 from The Written Word <bugzilla-gcc at thewrittenword dot com> ---
Created attachment 44529
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44529&action=edit
stdlib.h long_double patch
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Subject: [Bug target/86599] Problems building libgfortran from 7.2.0 on HP-UX 11.31/PA
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--- Comment #17 from The Written Word <bugzilla-gcc at thewrittenword dot com> ---
(In reply to The Written Word from comment #16)
> Created attachment 44529 [details]
> stdlib.h long_double patch
This is the patch I came up with. What do you think?
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From: "dave.anglin at bell dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/86599] Problems building libgfortran from 7.2.0 on HP-UX 11.31/PA
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--- Comment #18 from dave.anglin at bell dot net ---
On 2018-08-12 8:10 AM, bugzilla-gcc at thewrittenword dot com wrote:
> This is the patch I came up with. What do you think?
Did you check that "make check" in the fixincludes build directory works
and there
are no issues left? See README in fixincludes directory.
If this works, please add a ChangeLog entry to the patch and send it to
gcc-patches.
CC Bruce Korb and myself.
It would be good if you could post test results for 11.31 to
gcc-testresults. This will
help find further problems.
Thanks,
Dave
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Subject: [Bug target/86599] Problems building libgfortran from 7.2.0 on HP-UX 11.31/PA
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--- Comment #19 from The Written Word <bugzilla-gcc at thewrittenword dot com> ---
(In reply to dave.anglin from comment #18)
> On 2018-08-12 8:10 AM, bugzilla-gcc at thewrittenword dot com wrote:
> > This is the patch I came up with. What do you think?
>
> Did you check that "make check" in the fixincludes build directory works
> and there are no issues left? See README in fixincludes directory.
>
> If this works, please add a ChangeLog entry to the patch and send it to
> gcc-patches.
> CC Bruce Korb and myself.
>
> It would be good if you could post test results for 11.31 to
> gcc-testresults. This will
> help find further problems.
Ok, will take care of all of the above. Found one issue in my patch which I'm
testing now. Once I have something that passes the above, will submit.
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Subject: [Bug c++/86918] internal compiler error: unexpected expression 'v' of kind template_parm_index
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86918
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-12
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed. Not a regression as far as I can see.
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Subject: [Bug c++/86918] internal compiler error: unexpected expression 'v' of kind template_parm_index
Date: Sun, 12 Aug 2018 13:49:00 -0000
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r223304. With r223301, there's an error.
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Subject: [Bug c++/86918] internal compiler error: unexpected expression 'v' of kind template_parm_index
Date: Sun, 12 Aug 2018 13:58:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |ice-on-invalid-code
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I guess invalid:
$ clang++ -c 86918.C -std=c++17
86918.C:8:15: error: non-type template parameter conflicts with previous
non-type template parameter pack
template<bool v>
^
86918.C:3:21: note: previous non-type template parameter pack declared here
template<bool...>
^
86918.C:13:23: error: implicit instantiation of undefined template
'S<int>::X<true>'
static_assert(S<int>::X<true>::value);
^
86918.C:4:12: note: template is declared here
struct X;
^
2 errors generated.
>From gcc-bugs-return-612591-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 15:02:34 2018
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Subject: [Bug libstdc++/86910] std::filesystem::create_directories doesn't set error code or throw while violating postcondition.
Date: Sun, 12 Aug 2018 15:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86910
--- Comment #6 from Steffen Schuemann <ssh at pobox dot com> ---
Yeah, I totally understand, that if the behaviour of create_directories was in
conformance to the resolution to that defect, you don't feel like changing
anything. And I definitely don't want to be pedantic. In the end, if this is,
what is wanted, I have to accept the solution. Well, I might even feel pressed
to adapt the behaviour of my own implementation to that. I guess, if I had seen
the defect report in advance, I might not even have bothered you with this,
even if I would have felt bad about that decision. But I'm really grateful,
that you did forward that question, thank you for trying.
The GCC version I was using was simply the GCC8 that my Ubuntu 18.04 virtual
machine had available. I didn't want to build my own GCC on that vm as I have
some disk space issues. Before filing the issue, I double checked against the
head of the source, to make sure it is nothing changed in a later version. I
additionally tested against the g++ on my macOS that is the 8.1.0 from
homebrew.
And just for the fun of it, I used some time to double check the source of
libc++ and compiled myself a clang-8 from HEAD to run my tests with that one
too, and it is just the other way around: create_directories fails/throws when
a file with that name exists, and create_directory doesn't. :-)
I guess there's some inconsistency too, but this is the wrong issue tracker for
that.
In the end, I vote for consistency, either the more useful way with the
postcondition, or the fixed way without. Whichever docs you use when calling
them, they should behave consistently.
Thanks again, for the help and work!
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Subject: [Bug c++/86922] New: Invoking templated PTMF on subclass gives false strict-aliasing warning
Date: Sun, 12 Aug 2018 15:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86922
Bug ID: 86922
Summary: Invoking templated PTMF on subclass gives false
strict-aliasing warning
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bmerry at gmail dot com
Target Milestone: ---
When using a pointer-to-member-function which is a template parameter on an
instance of a derived class, I get a warning about type-punned pointers
breaking strict aliasing. Warning message and sample code are below.
This doesn't seem to be a recent regression. I get essentially the same warning
(modulo formatting) from 4.8.5, 7.3.0 and Ubuntu's pre-release 8.0.1 (all on
Ubuntu 18.04, x86-64).
The code:
class A
{
public:
int a;
void foo() const;
};
class B : public A {};
template<void (A::*Ptr)() const>
class Wrapper
{
public:
void operator()(const B &obj) const
{
return (obj.*Ptr)();
}
};
void call()
{
Wrapper<&B::foo> wrapper;
wrapper(B());
}
Command line:
g++ -c strict.cpp -Wall -O2
Output:
with void (A::* Ptr)() const = &A::foo]’:
strict.cpp:23:16: required from here
strict.cpp:16:26: warning: dereferencing type-punned pointer will break
strict-aliasing rules [-Wstrict-aliasing]
return (obj.*Ptr)();
~~~~~~~~~~^~
gcc version info:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.3.0-16ubuntu3'
--with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --with-as=/usr/bin/x86_64-linux-gnu-as
--with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-7
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)
Alternate version info:
Using built-in specs.
COLLECT_GCC=gcc-8
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
8-20180414-1ubuntu2' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --with-as=/usr/bin/x86_64-linux-gnu-as
--with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-8
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 8.0.1 20180414 (experimental) [trunk revision 259383] (Ubuntu
8-20180414-1ubuntu2)
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Subject: [Bug fortran/86472] allocatable array, bound-procedure, submodule
Date: Sun, 12 Aug 2018 15:14:00 -0000
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Paul Thomas <pault at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #7 from Paul Thomas <pault at gcc dot gnu.org> ---
> Everything goes through without error. I thought "Such specifications have
> no effect." was not clear. The uncharacteristic entities should not be
> specified in the interface.
Hi Jim,
I thought the wording to be very strange as well. I wondered if it is just a
convenience to allow copy and paste of all the specification statements into an
interface.
I have marked the PR as RESOLVED/INVALID - if you have any problems with that,
remark it as WAITING.
Thanks for the report by the way :-)
Paul
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Subject: [Bug fortran/86906] erroneous name clash with renaming in use statement
Date: Sun, 12 Aug 2018 15:36:00 -0000
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--- Comment #3 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Sun Aug 12 15:35:53 2018
New Revision: 263498
URL: https://gcc.gnu.org/viewcvs?rev=263498&root=gcc&view=rev
Log:
2018-08-12 Paul Thomas <pault@gcc.gnu.org>
PR fortran/86906
* resolve.c (resolve_fl_variable_derived): Check if the derived
type is use associated before checking for the host association
error.
2018-08-12 Paul Thomas <pault@gcc.gnu.org>
PR fortran/86906
* gfortran.dg/use_rename_9.f90: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/gfortran.dg/use_rename_9.f90
Modified:
branches/gcc-8-branch/gcc/fortran/ChangeLog
branches/gcc-8-branch/gcc/fortran/resolve.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/86906] erroneous name clash with renaming in use statement
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Paul Thomas <pault at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Paul Thomas <pault at gcc dot gnu.org> ---
Fixed on trunk and 8-branch
Thanks for the report.
Paul
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Subject: [Bug fortran/66679] [OOP] ICE with class(*) and transfer
Date: Sun, 12 Aug 2018 17:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66679
--- Comment #4 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Sun Aug 12 17:19:09 2018
New Revision: 263499
URL: https://gcc.gnu.org/viewcvs?rev=263499&root=gcc&view=rev
Log:
2018-08-12 Paul Thomas <pault@gcc.gnu.org>
PR fortran/66679
* trans-intrinsic.c (gfc_conv_intrinsic_transfer): Class array
elements are returned as references to the data element. Get
the class expression by stripping back the references. Use this
for the element size.
2018-08-12 Paul Thomas <pault@gcc.gnu.org>
PR fortran/66679
* gfortran.dg/transfer_class_3.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/transfer_class_3.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/trans-intrinsic.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/66679] [OOP] ICE with class(*) and transfer
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--- Comment #5 from Paul Thomas <pault at gcc dot gnu.org> ---
Fixed on trunk.
Thanks for the report and sorry for the long delay in committing the fix.
Paul
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Subject: [Bug fortran/31237] [meta-bug] TRANSFER intrinsic
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Bug 31237 depends on bug 66679, which changed state.
Bug 66679 Summary: [OOP] ICE with class(*) and transfer
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66679
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Subject: [Bug c/86923] New: Missed optimization performing consecutive integer sum, loop not removed
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Bug ID: 86923
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sum, loop not removed
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unsigned long f(unsigned int n) {
unsigned long total = 0;
for (unsigned int i = 0; i < n; ++i)
total += i;
return total;
}
It may not be terribly useful to report this, as I can (and arguably should)
write n(n-1)/2 manually, but clang does successfully transform this into:
lea eax, [rdi - 1]
add edi, -2
imul rdi, rax
shr rdi
add rdi, rax
whereas GCC tries instead to vectorize and process the loop as written.
Obviously, O(1) is preferable to O(n) here.
This applies to both C and C++.
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Subject: [Bug tree-optimization/86924] New: tree-slp-vectorize may create unaligned memory access, causing segmentation fault
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Bug ID: 86924
Summary: tree-slp-vectorize may create unaligned memory access,
causing segmentation fault
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Compiler version: 8.2.0 for Windows 64 bit, as released in MSYS2 / MinGW64
Windows 7 SP1, 64 bit
$ gcc -v
Using built-in specs.
COLLECT_GCC=H:\development\media-autobuild_suite-master\msys64\mingw64\bin\gcc.exe
COLLECT_LTO_WRAPPER=H:/development/media-autobuild_suite-master/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.2.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../gcc-8.2.0/configure --prefix=/mingw64
--with-local-prefix=/mingw64/local --build=x86_64-w64-mingw32
--host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32
--with-native-system-header-dir=/mingw64/x86_64-w64-mingw32/include
--libexecdir=/mingw64/lib --enable-bootstrap --with-arch=x86-64
--with-tune=generic --enable-languages=ada,c,lto,c++,objc,obj-c++,fortran
--enable-shared --enable-static --enable-libatomic --enable-threads=posix
--enable-graphite --enable-fully-dynamic-string
--enable-libstdcxx-filesystem-ts=yes --enable-libstdcxx-time=yes
--disable-libstdcxx-pch --disable-libstdcxx-debug --disable-isl-version-check
--enable-lto --enable-libgomp --disable-multilib --enable-checking=release
--disable-rpath --disable-win32-registry --disable-nls --disable-werror
--disable-symvers --with-libiconv --with-system-zlib --with-gmp=/mingw64
--with-mpfr=/mingw64 --with-mpc=/mingw64 --with-isl=/mingw64
--with-pkgversion='Rev1, Built by MSYS2 project'
--with-bugurl=https://sourceforge.net/projects/msys2 --with-gnu-as
--with-gnu-ld
Thread model: posix
gcc version 8.2.0 (Rev1, Built by MSYS2 project)
The AOMedia AV1 video encoder compiled with this version (but it is probably
independent of the operating system) crashes while encoding. The following bug
report in the Chromium bug tracker analyzed the problem, especially comment 7
went down to disassembly:
https://bugs.chromium.org/p/aomedia/issues/detail?id=2055#c7
Summary by lupo...:
+----
Bug appears in the compilation of
https://aomedia.googlesource.com/aom/+/da17065690c185ae678d5db9466cf0a402ca6b6d/av1/encoder/encoder.c#3415
More precisely in the optimized and inlined lshift_bwd_ref_frames(cpi) inside
update_reference_frames
Disassembly listings to follow:
cmake -G "MSYS Makefiles" -DCONFIG_LOWBITDEPTH=1 -DENABLE_DOCS=0
-DENABLE_TESTS=off ../aom
loc_4D5CD2:
mov edx, [rcx+35624Ch]
movdqa xmm3, xmmword ptr [rcx+478E38h]
mov [rcx+356248h], edx
mov edx, [rcx+356254h]
movaps xmmword ptr [rcx+478E28h], xmm3
movdqa xmm3, xmmword ptr [rcx+478E58h]
mov [rcx+35624Ch], edx
movaps xmmword ptr [rcx+478E38h], xmm3
mov [rcx+356254h], r11d
jmp loc_4D58A0
cmake -G "MSYS Makefiles" -DCONFIG_LOWBITDEPTH=1 -DENABLE_DOCS=0
-DENABLE_TESTS=off -DAOM_EXTRA_C_FLAGS="-fno-tree-slp-vectorize"
-DAOM_EXTRA_CXX_FLAGS="-fno-tree-slp-vectorize" ../aom
loc_4D5DC2:
mov edx, [rcx+35624Ch]
movdqu xmm3, xmmword ptr [rcx+478E38h]
movdqu xmm5, xmmword ptr [rcx+478E58h]
mov [rcx+356248h], edx
mov edx, [rcx+356254h]
movups xmmword ptr [rcx+478E28h], xmm3
mov [rcx+35624Ch], edx
movups xmmword ptr [rcx+478E38h], xmm5
mov [rcx+356254h], r11d
jmp loc_4D5993
It all reduces to aligned vs unaligned memory access. By manually patching the
faulty executable, changing movdqa to movdqu and movaps to movups, I have been
able to finish an encode without problems.
+----
Please excuse not providing all the details you requested in the "Reporting
Bugs" guide. But I believe the linked bug report in the Chromium tracker is
verbose enough to understand the issue.
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Subject: [Bug c/86925] New: ice in get_predictor_value, at pre dict.c:2551
Date: Sun, 12 Aug 2018 18:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86925
Bug ID: 86925
Summary: ice in get_predictor_value, at pre dict.c:2551
Product: gcc
Version: 8.0
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Priority: P3
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Created attachment 44530
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44530&action=edit
C source code
For the attached C code, compiled with flag -O2 and recent gcc trunk:
../results.263455/bin/gcc
../results.263471.ubsan/bin/gcc
during GIMPLE pass: profile_estimate
gstsystemclock.c: In function ‘gst_system_clock_id_wait_jitter_unlocked’:
gstsystemclock.c:1026:1: internal compiler error: in get_predictor_value, at
pre
dict.c:2551
0x611f7d get_predictor_value
../../trunk/gcc/predict.c:2551
0x1bce7d3 tree_predict_by_opcode
../../trunk/gcc/predict.c:2586
0x1bce7d3 tree_estimate_probability_bb
../../trunk/gcc/predict.c:2969
0x1bffc99 tree_estimate_probability(bool)
../../trunk/gcc/predict.c:2997
So the problem seems to have started between revisions 263455 and 263471.
I'll have a go at reducing the code.
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Subject: [Bug c/86925] ice in get_predictor_value, at predict.c:2551
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86925
David Binderman <dcb314 at hotmail dot com> changed:
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----------------------------------------------------------------------------
CC| |marxin at gcc dot gnu.org
--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
Revision 263466 may well be the culprit. Adding marxin for their advice.
>From gcc-bugs-return-612603-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 18:36:16 2018
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Subject: [Bug c/86925] ice in get_predictor_value, at predict.c:2551
Date: Sun, 12 Aug 2018 18:36:00 -0000
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--- Comment #2 from David Binderman <dcb314 at hotmail dot com> ---
Reduced C code is:
typedef enum { a } b;
d() {
b c;
do
if (__builtin_expect(({
int e;
if (c == a)
e = 1;
else
e = 0;
e;
}),
0))
break;
while (__builtin_expect(({ ({ f(); }); }), 0));
if (__builtin_expect(({
int e;
if (c == a)
e = 1;
else
e = 0;
e;
}),
0))
g();
}
>From gcc-bugs-return-612604-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 19:24:58 2018
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Subject: [Bug c/86925] ice in get_predictor_value, at predict.c:2551
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-12
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Thanks for the report, I'm aware of it already by Jeff Law. I've got fix that
I'll install tomorrow.
>From gcc-bugs-return-612606-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 19:57:28 2018
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Subject: [Bug middle-end/26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)
Date: Sun, 12 Aug 2018 19:57:00 -0000
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Bug 26163 depends on bug 85160, which changed state.
Bug 85160 Summary: GCC generates mvn/and instructions instead of bic on aarch64
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85160
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>From gcc-bugs-return-612605-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 19:57:27 2018
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Subject: [Bug rtl-optimization/85160] GCC generates mvn/and instructions instead of bic on aarch64
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This is fixed on trunk now.
>From gcc-bugs-return-612607-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 20:49:07 2018
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Subject: [Bug c++/85457] enum and auto template parameter mixup
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ensadc at mailnesia dot com changed:
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CC| |ensadc at mailnesia dot com
--- Comment #1 from ensadc at mailnesia dot com ---
This seems to have been fixed. Duplicate of bug 79092?
>From gcc-bugs-return-612609-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 22:36:00 2018
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Subject: [Bug c++/86921] do not remove input in bash
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is not a usable bug report.
Please see https://gcc.gnu.org/bugs/
>From gcc-bugs-return-612608-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 22:35:21 2018
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Subject: [Bug libstdc++/86910] std::filesystem::create_directories doesn't set error code or throw while violating postcondition.
Date: Sun, 12 Aug 2018 22:35:00 -0000
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--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Steffen Schuemann from comment #6)
> And just for the fun of it, I used some time to double check the source of
> libc++ and compiled myself a clang-8 from HEAD to run my tests with that one
> too, and it is just the other way around: create_directories fails/throws
> when a file with that name exists, and create_directory doesn't. :-)
Ha!
> In the end, I vote for consistency, either the more useful way with the
> postcondition, or the fixed way without. Whichever docs you use when calling
> them, they should behave consistently.
Yes, I definitely agree.
Once the committee finishes discussing it and decides to either revisit the DR,
or reconfirm it's definitely what we want, then I'll change libstdc++.
>From gcc-bugs-return-612610-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 22:37:59 2018
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Subject: [Bug c++/85457] enum and auto template parameter mixup
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to ensadc from comment #1)
> This seems to have been fixed. Duplicate of bug 79092?
Yes, thanks
*** This bug has been marked as a duplicate of bug 79092 ***
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Subject: [Bug c++/79092] template<auto>: type ignored if value already instantiated
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |info at thinkmeta dot de
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 85457 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-612612-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 23:31:35 2018
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From: "v.reshetnikov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86926] New: [Regression] ICE for a recursive generic lambda
Date: Sun, 12 Aug 2018 23:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86926
Bug ID: 86926
Summary: [Regression] ICE for a recursive generic lambda
Product: gcc
Version: 9.0
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/************************* BEGIN SOURCE *************************/
int main() {
constexpr auto f = [](auto self, auto n) {
if(n < 2) return n;
return self(self, n - 1) + self(self, n - 2);
};
constexpr auto fibonacci = [=](auto n) { return f(f, n); };
static_assert(fibonacci(7) == 13);
}
/************************** END SOURCE **************************/
Compile with -std=c++17.
EXPECTED: no errors.
ACTUAL:
<source>: In instantiation of 'main()::<lambda(auto:3)> [with auto:3 = int]':
<source>:11:30: required from here
<source>:9:54: internal compiler error: in build_over_call, at cp/call.c:8214
9 | constexpr auto fibonacci = [=](auto n) { return f(f, n); };
| ~^~~~~~
Tested with build 9.0.0 20180810 (experimental), appears to be a regression
from GCC 8.2. For comparison, the code also successfully compiles with Clang.
>From gcc-bugs-return-612613-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 12 23:41:43 2018
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Subject: [Bug c++/86926] [Regression] ICE for a recursive generic lambda
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--- Comment #1 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
Note: the error disappears if the variable `f` is not declared `constexpr`.
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Subject: [Bug c++/86926] [8/9 Regression] ICE for a recursive generic lambda
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-12
CC| |mpolacek at gcc dot gnu.org
Summary|[Regression] ICE for a |[8/9 Regression] ICE for a
|recursive generic lambda |recursive generic lambda
Ever confirmed|0 |1
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug c++/86926] [8/9 Regression] ICE for a recursive generic lambda
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r261121.
>From gcc-bugs-return-612616-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 01:21:27 2018
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Subject: [Bug bootstrap/78251] config/gettext.m4 and config/iconv.m4 contaminate CPPFLAGS
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2017-07-20 00:00:00 |2018-8-12
CC| |jeremyhu at macports dot org
--- Comment #7 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #4)
> (In reply to Mike Stump from comment #3)
> > I've been avoiding this bug for years by just removing the unwind.h header.
> > :-(
>
> Confirming because I seem to remember solving a build issue like this in the
> past, too.
Just happened to me again because MacPorts reinstalled libunwind-headers on me
even though I had deactivated it, reconfirming.
>From gcc-bugs-return-612617-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 01:44:14 2018
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Subject: [Bug tree-optimization/86927] New: Gcc miscompiles at -O3 on valid code
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Bug ID: 86927
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It appears to be a recent regression. And it happens at -O3 only.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 9.0.0 20180812 (experimental) [trunk revision 263494] (GCC)
$ gcc-trunk abc.c ; ./a.out
$ gcc-trunk -O2 abc.c ; ./a.out
$ gcc-trunk -O3 abc.c ; ./a.out
Aborted (core dumped)
$ cat abc.c
int a[28];
int b;
void abort();
int main() {
a[4] = 1;
int c = 1;
for (; b < 8; b++)
if (a[b])
c = 0;
if (c)
abort();
}
>From gcc-bugs-return-612618-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 01:48:59 2018
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Subject: [Bug c++/81718] g++ segfault in tsubst_copy_and_build when creating type alias
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--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #1)
>
> I would have to rebuild my gcc with debug info to get a better backtrace.
So I tried doing that but it crashed my debugger; I might need to open a
separate bug for that...
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Subject: [Bug middle-end/82798] Inconsistent descriptions for warning options in documentation
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--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Julien ÉLIE from comment #2)
> Other points:
>
> 6/ -Wsuggest-final-types and -Wsuggest-final-methods should be mentioned for
> C++ (and maybe Objective-C++) only.
>
> 7/ -Wc++11-compat and -Wc++14-compat are present in the -Wall list but
> without the mention for C++ and Objective-C++. I believe it should be
> mentioned.
Yeah those points probably fit in with bug 71283 too...
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Subject: [Bug c++/71424] std::initializer_list<T[N]>
Date: Mon, 13 Aug 2018 02:35:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-13
CC| |mpolacek at gcc dot gnu.org
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-612621-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 02:44:14 2018
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Subject: [Bug c++/86594] Crash on trying to capture 'this' in instantiation of generic lambda
Date: Mon, 13 Aug 2018 02:44:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-612622-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 02:47:48 2018
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Subject: [Bug pch/61250] Random pch failures on x86_64-apple-darwin1(3|4).
Date: Mon, 13 Aug 2018 02:47:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |dmalcolm at redhat dot com,
| |per at bothner dot com
--- Comment #20 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jack Howarth from comment #16)
> (In reply to howarth from comment #15)
> > (In reply to howarth from comment #14)
> > > Testing https://gcc.gnu.org/ml/gcc-patches/2015-03/msg01334.html in case
> > > correction of the overflow tests eliminates this bug.
> >
> > The proposed patch for correcting overflows doesn't eliminate this bug.
>
> With Jan's patch the failure still appears as...
>
> #0 0x00007fff96238286 in __pthread_kill ()
> #1 0x00007fff9488042f in pthread_kill ()
> #2 0x00007fff8e9c1b53 in abort ()
> #3 0x0000000100f32170 in linemap_lookup (set=0x10175e0f0, line=651) at
> ../../gcc-5-20150326/libcpp/line-map.c:806
Since the crash is in libcpp, cc-ing libcpp maintainers
>From gcc-bugs-return-612623-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 02:58:56 2018
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Subject: [Bug ada/86916] 8.1.0 (x86_64-apple-darwin15) Constraint_Error erroneous memory access
Date: Mon, 13 Aug 2018 02:58:00 -0000
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--- Comment #4 from Roger Mc Murtrie <rogermc at iinet dot net.au> ---
Simon Wright has determined the problem and notes that GNAT has
failed to recognise the actual problem.
(https://groups.google.com/forum/#!topic/comp.lang.ada/MdywAlMPQms)
The problem is in the packages Morph.Mesh_Morph_Value_Pointers,
Mesh_Morph_Weight_Pointers.
You say
package Mesh_Morph_Value_Pointers is new Interfaces.C.Pointers
(Interfaces.C.unsigned, API_Morph_Value, API_Morph_Values_Array,
API_Morph_Value'(others => <>));
but
type API_Morph_Value is new Interfaces.C.unsigned;
so others => <> isn't a legal expression for an API_Morph_Value; you
should say
API_Morph_Value'(0));
There is still a bug, which ought to be fixed, but it's that GNAT has
failed to recognise the actual problem and has got fatally confused.
>From gcc-bugs-return-612624-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 03:01:47 2018
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Subject: [Bug tree-optimization/84353] [8/9 Regression] [graphite] ICE in set_codegen_error, at graphite-isl-ast-to-gimple.c:206
Date: Mon, 13 Aug 2018 03:01:00 -0000
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--- Comment #8 from Arseny Solokha <asolokha at gmx dot com> ---
(In reply to Richard Biener from comment #5)
> Getting more testcase for this is nice though.
int
dt (__int128 gg, int sn, int *b2)
{
int wt = 0, f4 = 0;
while (wt < sn)
{
f4 = !!(gg * 2 + sn) + (double) b2[wt];
++wt;
}
return f4;
}
% gcc-9.0.0-alpha20180805 -O2 -floop-nest-optimize -funswitch-loops -fwrapv
-fno-tree-loop-im -c inkukbsw.c
during GIMPLE pass: graphite
inkukbsw.c: In function 'dt':
inkukbsw.c:2:1: internal compiler error: in set_codegen_error, at
graphite-isl-ast-to-gimple.c:205
dt (__int128 gg, int sn, int *b2)
^~
0x736dc0 translate_isl_ast_to_gimple::set_codegen_error()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/graphite-isl-ast-to-gimple.c:205
0x736e51 translate_isl_ast_to_gimple::set_codegen_error()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/tree.h:3237
0x736e51
translate_isl_ast_to_gimple::gcc_expression_from_isl_expr_int(tree_node*,
isl_ast_expr*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/graphite-isl-ast-to-gimple.c:308
0x14a98ae translate_isl_ast_to_gimple::binary_op_to_tree(tree_node*,
isl_ast_expr*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/graphite-isl-ast-to-gimple.c:322
0x14a98ae translate_isl_ast_to_gimple::binary_op_to_tree(tree_node*,
isl_ast_expr*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/graphite-isl-ast-to-gimple.c:322
0x14a98eb translate_isl_ast_to_gimple::binary_op_to_tree(tree_node*,
isl_ast_expr*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/graphite-isl-ast-to-gimple.c:340
0x14aa1f4 translate_isl_ast_to_gimple::graphite_create_new_guard(edge_def*,
isl_ast_expr*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/graphite-isl-ast-to-gimple.c:873
0x14ab797 translate_isl_ast_to_gimple::translate_isl_ast_node_if(loop*,
isl_ast_node*, edge_def*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/graphite-isl-ast-to-gimple.c:892
0x14ab714 translate_isl_ast_to_gimple::translate_isl_ast_node_block(loop*,
isl_ast_node*, edge_def*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/graphite-isl-ast-to-gimple.c:859
0x14abaf7 graphite_regenerate_ast_isl(scop*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/graphite-isl-ast-to-gimple.c:1505
0x14a7dec graphite_transform_loops()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/graphite.c:413
0x14a81e0 graphite_transforms
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/graphite.c:475
0x14a81e0 execute
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/graphite.c:552
(r263320)
>From gcc-bugs-return-612625-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 03:48:51 2018
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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/86928] New: ICE in compute_live, at sel-sched.c:3097
Date: Mon, 13 Aug 2018 03:48:00 -0000
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Bug ID: 86928
Summary: ICE in compute_live, at sel-sched.c:3097
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
Component: rtl-optimization
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Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: powerpc-*-linux-gnu, powerpcspe-*-linux-gnu
gcc-9.0.0-alpha20180805 snapshot (r263320) ICEs when compiling the following
snippet w/ -O2 (-O3, -Ofast) -fnon-call-exceptions -fsel-sched-pipelining
-fsel-sched-pipelining-outer-loops -fselective-scheduling -fno-if-conversion
-fno-tree-dce:
int kn;
void
gd (short int sk)
{
char *as;
while (sk < 1)
{
char *ci;
if (*ci == 0)
*as += ci;
for (kn = 0; kn < 18; ++kn)
{
}
++sk;
}
}
% powerpc-e300c3-linux-gnu-gcc-9.0.0-alpha20180805 -O2 -fnon-call-exceptions
-fsel-sched-pipelining -fsel-sched-pipelining-outer-loops
-fselective-scheduling -fno-if-conversion -fno-tree-dce -w -c opsr9okd.c
during RTL pass: sched1
opsr9okd.c: In function 'gd':
opsr9okd.c:21:1: internal compiler error: in compute_live, at sel-sched.c:3097
}
^
0xbe0aa2 compute_live(rtx_insn*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:3097
0xbe0938 compute_live_after_bb
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:3074
0xbe0938 compute_live(rtx_insn*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:3131
0xbe4058 code_motion_path_driver
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:6660
0xbe524d move_op
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:6714
0xbe524d move_exprs_to_boundary
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:5237
0xbe524d schedule_expr_on_boundary
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:5450
0xbe92a8 fill_insns
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:5592
0xbeb0de schedule_on_fences
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:7366
0xbeb0de sel_sched_region_2
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:7504
0xbec142 sel_sched_region_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:7546
0xbed735 sel_sched_region(int)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:7647
0xbee079 run_selective_scheduling()
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sel-sched.c:7733
0xbc5db4 rest_of_handle_sched
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sched-rgn.c:3718
0xbc5db4 execute
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180805/work/gcc-9-20180805/gcc/sched-rgn.c:3828
>From gcc-bugs-return-612626-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 06:14:04 2018
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Subject: [Bug c/86929] New: `-fstack-protector` results in wrong code
Date: Mon, 13 Aug 2018 06:14:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86929
Bug ID: 86929
Summary: `-fstack-protector` results in wrong code
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: lh_mouse at 126 dot com
Target Milestone: ---
Target: *-w64-mingw32
The following program:
```
void test(int n)
{
char str[50];
}
int main(void)
{
test(42);
}
```
, after being compiled with
```
x86_64-w64-mingw32-gcc -fstack-protector -O0 test.c
```
, results in assembly that references the FS segment register
```
test:
pushq %rbp
.seh_pushreg %rbp
movq %rsp, %rbp
.seh_setframe %rbp, 0
subq $96, %rsp
.seh_stackalloc 96
.seh_endprologue
movl %ecx, 16(%rbp)
movq %fs:0, %rax
```
, which causes crashes on x64, as on Windows this not the correct way to
reference native thread-local storage. At the moment, GCC should use emutls
instead.
Compiling this program with i686-w64-mingw32-gcc does not results in an
immediate segment fault, but the assembly code still references the GS segment
register, so it is still wrong.
Prior to GCC 8, stack protectors used static, non-thread-local pointers, which
were subject to data races, but didn't result in segment fault for
single-threaded programs.
>From gcc-bugs-return-612627-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 06:27:56 2018
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Subject: [Bug c/86929] `-fstack-protector` results in wrong code
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
dup.
*** This bug has been marked as a duplicate of bug 86832 ***
>From gcc-bugs-return-612628-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 06:27:56 2018
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Subject: [Bug target/86832] GCC v8.2.0 tries to use native TLS with -fstack-protector-strong on Windows (mingw-w64)
Date: Mon, 13 Aug 2018 06:27:00 -0000
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----------------------------------------------------------------------------
CC| |lh_mouse at 126 dot com
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 86929 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-612629-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 06:28:19 2018
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Subject: [Bug target/85644] [8/9 Regression] -fstack-protector generates invalid read to %fs:0x0 on mac
Date: Mon, 13 Aug 2018 06:28:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-13
Summary|-fstack-protector generates |[8/9 Regression]
|invalid read to %fs:0x0 on |-fstack-protector generates
|mac |invalid read to %fs:0x0 on
| |mac
Ever confirmed|0 |1
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
.
>From gcc-bugs-return-612630-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 06:28:42 2018
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Subject: [Bug target/85644] [8/9 Regression] -fstack-protector generates invalid read to %fs:0x0 on mac
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-612631-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 06:29:16 2018
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Subject: [Bug target/86832] [8/9 Regression] GCC v8.2.0 tries to use native TLS with -fstack-protector-strong on Windows (mingw-w64)
Date: Mon, 13 Aug 2018 06:29:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-13
Target Milestone|--- |8.3
Summary|GCC v8.2.0 tries to use |[8/9 Regression] GCC v8.2.0
|native TLS with |tries to use native TLS
|-fstack-protector-strong on |with
|Windows (mingw-w64) |-fstack-protector-strong on
| |Windows (mingw-w64)
Ever confirmed|0 |1
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
.
>From gcc-bugs-return-612632-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 06:43:27 2018
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Subject: [Bug c/86929] `-fstack-protector` results in wrong code
Date: Mon, 13 Aug 2018 06:43:00 -0000
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--- Comment #2 from Liu Hao <lh_mouse at 126 dot com> ---
Oh didn't know it happens on macOS too. I didn't find the duplicate because I
searched for 'mingw' only.
>From gcc-bugs-return-612633-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 07:10:46 2018
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Subject: [Bug tree-optimization/86927] [8/9 Regression] Gcc miscompiles at -O3 on valid code
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |7.3.0
Version|unknown |8.2.0
Keywords| |wrong-code
Last reconfirmed| |2018-08-13
CC| |hubicka at gcc dot gnu.org,
| |marxin at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
Summary|Gcc miscompiles at -O3 on |[8/9 Regression] Gcc
|valid code |miscompiles at -O3 on valid
| |code
Target Milestone|--- |8.3
Known to fail| |8.2.0, 9.0
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
I see it starting from r255268, but it's probably a latent issue.
>From gcc-bugs-return-612634-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 07:12:27 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/86925] ice in get_predictor_value, at predict.c:2551
Date: Mon, 13 Aug 2018 07:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86925
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|c |tree-optimization
Version|8.0 |9.0
Target Milestone|--- |9.0
>From gcc-bugs-return-612635-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 07:47:02 2018
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From: "janniksilvanus at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86930] New: g++ incorrectly complains about incomplete type in structured binding
Date: Mon, 13 Aug 2018 07:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86930
Bug ID: 86930
Summary: g++ incorrectly complains about incomplete type in
structured binding
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: janniksilvanus at gmail dot com
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: g++ --version
g++ (SUSE Linux) 8.1.1 20180719 [gcc-8-branch revision 262874]
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
: cat incomplete_type.ii
template <typename Index>
struct IndexPair {
Index first;
Index second;
};
using UsedIndexPair = IndexPair<int>;
template <typename Applier>
void call_applier(
UsedIndexPair const & indices,
Applier && applier)
{
auto const [a, b] = indices;
applier(a, b);
}
void instantiate()
{
call_applier(
{0, 1},
[&](int, int){});
}
: g++ --std=c++1z incomplete_type.ii -c
incomplete_type.ii: In function ‘void call_applier(const UsedIndexPair&,
Applier&&)’:
incomplete_type.ii:14:15: warning: structured binding refers to incomplete
class type ‘const IndexPair<int>’
auto const [a, b] = indices;
gcc-7.3.1 even crashes on this input:
/opt/rh/devtoolset-7/root/usr/bin/g++ --std=c++1z incomplete_type.ii -c
incomplete_type.ii: In function ‘void call_applier(const UsedIndexPair&,
Applier&&)’:
incomplete_type.ii:14:24: internal compiler error: Segmentation fault
auto const [a, b] = indices;
^~~~~~~
>From gcc-bugs-return-612636-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 08:07:12 2018
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From: "janniksilvanus at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86931] New: constexpr variable initialization: internal compiler error: in reshape_init_r, at cp/decl.c:6042
Date: Mon, 13 Aug 2018 08:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86931
Bug ID: 86931
Summary: constexpr variable initialization: internal compiler
error: in reshape_init_r, at cp/decl.c:6042
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: janniksilvanus at gmail dot com
Target Milestone: ---
: g++ --version
g++ (SUSE Linux) 8.1.1 20180719 [gcc-8-branch revision 262874]
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
: cat internal_compiler_error.ii
template <typename T>
struct Array {
T data[2];
};
template <typename Applier>
void test(
Applier const &)
{
auto constexpr data = Array<int>{0, 0};
}
void instantiate()
{
test([](){});
}
: g++ --std=c++1z internal_compiler_error.ii -c
internal_compiler_error.ii: In instantiation of ‘void test(const Applier&)
[with Applier = instantiate()::<lambda()>]’:
internal_compiler_error.ii:15:15: required from here
internal_compiler_error.ii:10:19: internal compiler error: in reshape_init_r,
at cp/decl.c:6152
auto constexpr data = Array<int>{0, 0};
^~~~
Note the similarity with https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86930,
may be related.
>From gcc-bugs-return-612637-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 08:52:48 2018
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Subject: [Bug c++/86930] g++ incorrectly complains about incomplete type in structured binding
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-13
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>From gcc-bugs-return-612638-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 08:59:27 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86922] Invoking templated PTMF on subclass gives false strict-aliasing warning
Date: Mon, 13 Aug 2018 08:59:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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>From gcc-bugs-return-612639-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 09:15:53 2018
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From: "zennehoy at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86932] New: [8 Regression] Empty non-type template parameter pack not considered for SFINAE.
Date: Mon, 13 Aug 2018 09:15:00 -0000
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Bug ID: 86932
Summary: [8 Regression] Empty non-type template parameter pack
not considered for SFINAE.
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: zennehoy at gmail dot com
Target Milestone: ---
The following code incorrectly compiles under GCC 8.1/8.2, but fails (as
expected) with GCC 7.3 and other compilers:
#include <type_traits>
template<class U, typename std::enable_if_t<std::is_const_v<U>>...>
void f() {}
int main()
{
f<int>();
}
The originating stackoverflow discussion about this issue can be found here:
https://stackoverflow.com/q/51787713/694509
A working example can be found on godbolt:
https://godbolt.org/g/Rb46qQ
>From gcc-bugs-return-612640-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 09:31:08 2018
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Subject: [Bug middle-end/85164] poly-int.h:845:5: runtime error: signed integer overflow
Date: Mon, 13 Aug 2018 09:31:00 -0000
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David Binderman <dcb314 at hotmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rsandifo at gcc dot gnu.org
--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
Still going wrong. Here is another test case:
$ ~/gcc/results.263471.ubsan/bin/gcc -c -O2 bug456.c
../../trunk/gcc/poly-int.h:1941:12: runtime error: negation of
-9223372036854775808 cannot be represented in type 'long int'; cast to an
unsigned type to negate this value to itself
$ more bug456.c
int a;
long b;
void c() { b = -9223372036854775807L - 1 - a; }
$
>From gcc-bugs-return-612641-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 09:38:26 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86921] do not remove input in bash
Date: Mon, 13 Aug 2018 09:38:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
If you're saying that data read from the terminal by std::cin cannot be
"un-read" by typing backspace, that's correct. That is not a GCC bug, it's just
how the OS works.
In the default line-buffered mode, when you hit Enter the line is sent to the
application. Typing backspace cannot undo that, the program has already read
the data, and doesn't receive the backspace characters.
>From gcc-bugs-return-612642-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 09:59:42 2018
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Subject: [Bug c++/86932] [8 Regression] Empty non-type template parameter pack not considered for SFINAE.
Date: Mon, 13 Aug 2018 09:59:00 -0000
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--- Comment #1 from zennehoy <zennehoy at gmail dot com> ---
Sorry, I included the problematic void non-type template parameter pack.
The type of std::enable_if_t should be specified as something other than void,
e.g., int:
#include <type_traits>
template<class U, typename std::enable_if_t<std::is_const_v<U>, int>...>
void f() {}
int main()
{
f<int>();
}
>From gcc-bugs-return-612643-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 10:16:40 2018
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Subject: [Bug tree-optimization/86889] s390x gcc build fails when configured with --disable-checking
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Ilya Leoshkevich <iii at linux dot ibm.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
--- Comment #4 from Ilya Leoshkevich <iii at linux dot ibm.com> ---
Bisect points to:
commit d19574debc50ff915c5d39c22a51cb0bc750e75d (HEAD, refs/bisect/bad)
Author: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri May 18 11:54:37 2018 +0000
2018-05-18 Richard Biener <rguenther@suse.de>
* gimple-ssa-evrp.c (class evrp_folder): Add
simplify_stmt_using_ranges
method.
(evrp_dom_walker::before_dom_children): Call it.
* gcc.dg/tree-ssa/pr21559.c: Adjust.
* gcc.dg/tree-ssa/pr45397.c: Likewise.
* gcc.dg/tree-ssa/pr61839_1.c: Likewise.
* gcc.dg/tree-ssa/pr61839_2.c: Likewise.
* gcc.dg/tree-ssa/pr61839_4.c: Likewise.
* gcc.dg/tree-ssa/vrp17.c: Likewise.
* gcc.dg/tree-ssa/vrp18.c: Likewise.
* gcc.dg/tree-ssa/vrp23.c: Likewise.
* gcc.dg/tree-ssa/vrp24.c: Likewise.
* gcc.dg/tree-ssa/vrp58.c: Likewise.
* gcc.dg/vrp-min-max-1.c: Likewise.
* gcc.dg/vrp-min-max-3.c: New testcase.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@260357
138bc75d-0d04-0410-961f-82ee72b054a4
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86932] [8/9 Regression] Empty non-type template parameter pack not considered for SFINAE.
Date: Mon, 13 Aug 2018 10:18:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |7.3.0
Keywords| |accepts-invalid
Last reconfirmed| |2018-08-13
CC| |jason at gcc dot gnu.org
Ever confirmed|0 |1
Summary|[8 Regression] Empty |[8/9 Regression] Empty
|non-type template parameter |non-type template parameter
|pack not considered for |pack not considered for
|SFINAE. |SFINAE.
Known to fail| |8.2.0, 9.0
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
You've got a stray 'typename' there.
Reduced:
template<bool, typename T> struct enable_if { using type = T; };
template<typename T> struct enable_if<false, T> { };
template<typename> struct is_foo { static constexpr bool value = false; };
template<class U, typename enable_if<is_foo<U>::value, int>::type...>
void f() {}
int main()
{
f<int>();
}
Started to be accepted with r247842
PR c++/79549 - C++17 ICE with non-type auto template parameter pack
* pt.c (convert_template_argument): Just return an argument pack.
(coerce_template_parameter_pack, template_parm_to_arg)
(extract_fnparm_pack, make_argument_pack, tsubst_template_args)
(tsubst_decl, tsubst, type_unification_real, unify_pack_expansion):
Don't set the type of a NONTYPE_ARGUMENT_PACK.
* parser.c (make_char_string_pack, make_string_pack): Likewise.
>From gcc-bugs-return-612645-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 10:21:00 2018
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Subject: [Bug c++/86870] Declaration disambiguation is too greedy
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--- Comment #1 from Nicolas Lesser <blitzrakete at gmail dot com> ---
Oops, I missed to define a default constructor for `X`. This however, does not
change the bug report and gcc still incorrectly parses the second statement as
a declaration.
>From gcc-bugs-return-612646-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 10:24:54 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/86846] [9 Regression] ld: (Warning) Unsatisfied symbol "__atomic_exchange_8" in libstdc++.sl
Date: Mon, 13 Aug 2018 10:24:00 -0000
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--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Ah, that patch assumes this is defined:
#ifdef __GTHREAD_MUTEX_INIT
__native_type _M_mutex = __GTHREAD_MUTEX_INIT;
constexpr __mutex_base() noexcept = default;
i.e. PTHREAD_MUTEX_INITIALIZER.
If that's not available we might just need to use a global mutex, without the
constant_init<> wrapper that makes the object immortal. In that case it will be
risky to use the default memory resource functions after static destructors
start (which is bad practice anyway).
So this would be a bit more robust:
--- a/libstdc++-v3/src/c++17/memory_resource.cc
+++ b/libstdc++-v3/src/c++17/memory_resource.cc
@@ -25,6 +25,10 @@
#include <memory_resource>
#include <atomic>
#include <new>
+#if ATOMIC_POINTER_LOCK_FREE != 2
+# include <bits/std_mutex.h> // std::mutex, std::lock_guard
+# include <bits/move.h> // std::exchange
+#endif
namespace std _GLIBCXX_VISIBILITY(default)
{
@@ -81,7 +85,39 @@ namespace pmr
constant_init<newdel_res_t> newdel_res{};
constant_init<null_res_t> null_res{};
+#if ATOMIC_POINTER_LOCK_FREE == 2
constant_init<atomic<memory_resource*>> default_res{&newdel_res.obj};
+#else
+ struct locking_atomic
+ {
+#ifdef __GTHREAD_MUTEX_INIT
+ // std::mutex has constexpr constructor
+ constexpr
+#endif
+ locking_atomic(memory_resource* r) : val(r) { }
+ mutex mx;
+ memory_resource* val;
+
+ memory_resource* load()
+ {
+ lock_guard<mutex> lock(mx);
+ return val;
+ }
+
+ memory_resource* exchange(memory_resource* r)
+ {
+ lock_guard<mutex> lock(mx);
+ return std::exchange(val, r);
+ }
+ };
+#ifdef __GTHREAD_MUTEX_INIT
+ constant_init<locking_atomic> default_res{&newdel_res.obj};
+#else
+ struct {
+ locking_atomic obj = &newdel_res.obj;
+ } default_res __attribute__ ((init_priority (100)));
+#endif
+#endif
} // namespace
memory_resource*
Unfortunately this produces a warning for targets without pointer-width atomics
and without PTHREAD_MUTEX_INITIALIZER:
/home/jwakely/src/gcc/gcc/libstdc++-v3/src/c++17/memory_resource.cc:119:55:
warning: requested init_priority is reserved for internal use
} default_res __attribute__ ((init_priority (100)));
^
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Subject: [Bug tree-optimization/86927] [8/9 Regression] Gcc miscompiles at -O3 on valid code
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
--- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Martin, can you try bisecting with -fvect-cost-model=unlimited ?
May be caused by vectorization, reduction created for 'c' looks wrong. gcc-7
did not try to vectorize this.
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From: "d25fe0be at outlook dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86933] New: GCC fails to recognize specialization of variadic non-type template parameter declared with `auto`
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Bug ID: 86933
Summary: GCC fails to recognize specialization of variadic
non-type template parameter declared with `auto`
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The following code fails to compile, saying `TT<&X::x, &X::y>` is not defined.
````
template <auto... Vs> struct TT;
template <class T, class... Ms, Ms T::*... Ptrs> struct TT<Ptrs...> {};
struct X {
int x;
double y;
};
TT<&X::x, &X::y> t;
```
Not sure if related, the following code (reduced version) is rejected as well:
```
template <auto... Vs> struct TT;
template <class... T, T*... Ptrs> struct TT<Ptrs...> {};
int x;
double y;
TT<&x, &y> t;
```
clang (5.0 or higher) accepts both.
Live example: https://wandbox.org/permlink/ObPM2S5s0bsczNfk
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Subject: [Bug target/85590] [nvptx, libgomp, openacc] Use cuda runtime fns to determine launch configuration in nvptx plugin
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--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Mon Aug 13 12:04:24 2018
New Revision: 263505
URL: https://gcc.gnu.org/viewcvs?rev=263505&root=gcc&view=rev
Log:
[nvptx] Use CUDA driver API to select default runtime launch geometry
The CUDA driver API starting version 6.5 offers a set of runtime functions to
calculate several occupancy-related measures, as a replacement for the
occupancy
calculator spreadsheet.
This patch adds a heuristic for default runtime launch geometry, based on the
new runtime function cuOccupancyMaxPotentialBlockSize.
Build on x86_64 with nvptx accelerator and ran libgomp testsuite.
2018-08-13 Cesar Philippidis <cesar@codesourcery.com>
Tom de Vries <tdevries@suse.de>
PR target/85590
* plugin/cuda/cuda.h (CUoccupancyB2DSize): New typedef.
(cuOccupancyMaxPotentialBlockSize): Declare.
* plugin/cuda-lib.def (cuOccupancyMaxPotentialBlockSize): New
CUDA_ONE_CALL_MAYBE_NULL.
* plugin/plugin-nvptx.c (CUDA_VERSION < 6050): Define
CUoccupancyB2DSize and declare
cuOccupancyMaxPotentialBlockSize.
(nvptx_exec): Use cuOccupancyMaxPotentialBlockSize to set the
default num_gangs and num_workers when the driver supports it.
Modified:
trunk/libgomp/ChangeLog
trunk/libgomp/plugin/cuda-lib.def
trunk/libgomp/plugin/cuda/cuda.h
trunk/libgomp/plugin/plugin-nvptx.c
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Subject: [Bug c++/86933] GCC fails to recognize specialization of variadic non-type template parameter declared with `auto`
Date: Mon, 13 Aug 2018 12:17:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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>From gcc-bugs-return-612651-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 12:33:17 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/86934] New: Feature test macros in <version> should respect _GLIBCXX_HOSTED
Date: Mon, 13 Aug 2018 12:33:00 -0000
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Bug ID: 86934
Summary: Feature test macros in <version> should respect
_GLIBCXX_HOSTED
Product: gcc
Version: 9.0
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The current <version> header doesn't account for the fact that many features
are not defined for freestanding builds.
Also, the --enable-libstdcxx-filesystem-ts configure option means that
<filesystem> isn't always present, even for hsoted builds (but that should
change for GCC 9 anyway).
I'm not sure how to do this cleanly so that <version> is always consistent with
the real values in other headers. We could generate <version> from a script
that processes the headers (separately for freestanding and hosted headers) and
just extracts the __cpp_lib_* macros and the preprocessor conditions they
depend on.
Also, in https://gcc.gnu.org/ml/libstdc++/2018-07/msg00128.html I said:
It would be nice if we had tests to check that every macro in
<version> matches the other definition of it (i.e. either both are
defined to the same value, or neither is defined).
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
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Andrey Guskov <andrey.y.guskov at intel dot com> changed:
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--- Comment #7 from Andrey Guskov <andrey.y.guskov at intel dot com> ---
On Haswell, r263067 is also responsible for that:
spawn -ignore SIGHUP /work/gcc/xgcc -B/work/gcc/
/source/gcc/testsuite/gcc.target/i386/avx-cvt-2.c -fno-diagnostics-show-caret
-fdiagnostics-color=never -O3 -mavx -mno-avx2 -mtune=generic
-fdump-tree-vect-details -ffat-lto-objects -S -o avx-cvt-2.s
PASS: gcc.target/i386/avx-cvt-2.c (test for excess errors)
PASS: gcc.target/i386/avx-cvt-2.c scan-tree-dump-times vect "vectorized 1 loops
in function" 6
PASS: gcc.target/i386/avx-cvt-2.c scan-assembler
vcvttpd2dq(y[^\n\r]*%xmm|[^\n\r]*xmm[^\n\r]*YMMWORD PTR)
PASS: gcc.target/i386/avx-cvt-2.c scan-assembler vcvtdq2ps[^\n\r]*ymm
FAIL: gcc.target/i386/avx-cvt-2.c scan-assembler
vcvtps2pd[^\n\r]*(%xmm[^\n\r]*%ymm|ymm[^\n\r]*xmm)
Option set:
-with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-shared
--enable-host-shared --enable-clocale=gnu --enable-cloog-backend=isl
--enable-languages=c,c++,fortran,jit,lto -with-arch=haswell --with-cpu=haswell
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Subject: [Bug tree-optimization/86927] [8/9 Regression] Gcc miscompiles at -O3 on valid code
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Then it ends in Richi's revision r249553. Sounds like culprit.
>From gcc-bugs-return-612653-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 12:54:16 2018
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Subject: [Bug libstdc++/45093] Different definitions of _Rb_tree::{erase,_M_destroy_node} between C++98 and C++0x
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The different definitions of erase have been mangled differently since GCC 4.8,
by using the abi-tag.
Gold still warns about _M_destroy_node, but that's harmless.
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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Subject: [Bug libstdc++/86934] Feature test macros in <version> should respect _GLIBCXX_HOSTED
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86935
Bug ID: 86935
Summary: Bad locus in ASSOCIATE statement
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: janus at gcc dot gnu.org
Target Milestone: ---
Test case (invalid code):
implicit none
type :: t
real :: r = 0.5
integer :: i = 3
end type
type(t) :: x
associate (r => x%r, &
i => x%ii)
print *, r ,i
end associate
end
gfortran says:
associate (r => x%r, &
1
Error: Expected association at (1)
The error message points to the wrong line (the first association is fine, but
the second one is wrong).
>From gcc-bugs-return-612658-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 13:51:52 2018
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Subject: [Bug fortran/86935] Bad locus in ASSOCIATE statement
Date: Mon, 13 Aug 2018 13:51:00 -0000
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--- Comment #1 from janus at gcc dot gnu.org ---
The following is sufficient to tip the locus to the next line:
Index: gcc/fortran/match.c
===================================================================
--- gcc/fortran/match.c (revision 263503)
+++ gcc/fortran/match.c (working copy)
@@ -1888,6 +1888,8 @@ gfc_match_associate (void)
gfc_association_list* newAssoc = gfc_get_association_list ();
gfc_association_list* a;
+ gfc_gobble_whitespace ();
+
/* Match the next association. */
if (gfc_match (" %n => %e", newAssoc->name, &newAssoc->target)
!= MATCH_YES)
>From gcc-bugs-return-612659-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 14:53:14 2018
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Subject: [Bug target/85640] [8/9 Regression] Code size regression vs 7.3.1
Date: Mon, 13 Aug 2018 14:53:00 -0000
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--- Comment #3 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
(first paragraph of previous comment had 'before'/'after' swapped, sorry)
Also note that adjusting the testcase to use size_t rather than unsigned int
for the 'len' variable (as production code probably should) avoids the issue:
final value replacement doesn't need to special case len==0 then.
>From gcc-bugs-return-612660-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 14:58:42 2018
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Subject: [Bug tree-optimization/86936] New: strlen() of a constant not folded due to laddress transformation
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86936
Bug ID: 86936
Summary: strlen() of a constant not folded due to laddress
transformation
Product: gcc
Version: 9.0
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Despite the argument being a constant string, as a result of the laddress
transformation the call to strnlen() in the function below is not folded into a
constant because it loses the knowledge about which element of the array the
strnlen argument refers to.
$ cat f.c && gcc -O2 -S -Wall -Wextra -Wnull-dereference
-fdump-tree-bswap=/dev/stdout -fdump-tree-laddress=/dev/stdout f.c
const char a[][4] = { "123", "1234" };
int f (int i)
{
return __builtin_strnlen (&a[1][i], 4);
}
;; Function f (f, funcdef_no=0, decl_uid=1906, cgraph_uid=1, symbol_order=1)
f (int i)
{
const char * _1;
long unsigned int _2;
int _5;
<bb 2> [local count: 1073741825]:
_1 = &a[1][i_3(D)];
_2 = __builtin_strnlen (_1, 4);
_5 = (int) _2;
return _5;
}
;; Function f (f, funcdef_no=0, decl_uid=1906, cgraph_uid=1, symbol_order=1)
f (int i)
{
const char * _1;
long unsigned int _2;
int _5;
sizetype _6;
sizetype _7;
<bb 2> [local count: 1073741825]:
_6 = (sizetype) i_3(D);
_7 = _6 + 4;
_1 = &a + _7;
_2 = __builtin_strnlen (_1, 4);
_5 = (int) _2;
return _5;
}
>From gcc-bugs-return-612661-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 15:01:17 2018
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
Date: Mon, 13 Aug 2018 15:01:00 -0000
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--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
So is it worse code, better code, is the testcase broken / suboptimal?
The haswell problem seems to be completely unrelated, so open a separate PR
please.
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
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--- Comment #9 from Andrey Guskov <andrey.y.guskov at intel dot com> ---
OK.
>From gcc-bugs-return-612663-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 15:02:28 2018
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Subject: [Bug tree-optimization/86936] strlen() of a constant not folded due to laddress transformation
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic,
| |missed-optimization
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Besides missing out on an optimization opportunity the transformation also
prevents diagnosing strlen() calls with such arguments where the second
argument is greater than the upper bound of the array. (Issuing the diagnostic
regardless would result in false positives if the referenced element was, in
fact, nul-terminated, as would be the case if a were defined like so: const
char a[][4] = { "12", "123", "1234" };)
>From gcc-bugs-return-612664-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 15:09:34 2018
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Subject: [Bug tree-optimization/86936] strnlen() of a constant not folded due to laddress transformation
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|strlen() of a constant not |strnlen() of a constant not
|folded due to laddress |folded due to laddress
|transformation |transformation
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
This is about strnlen (strlen is folded early on).
>From gcc-bugs-return-612665-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 15:12:53 2018
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Subject: [Bug tree-optimization/86937] New: strnlen() of a conditional expression with constant operands not folded
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Bug ID: 86937
Summary: strnlen() of a conditional expression with constant
operands not folded
Product: gcc
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GCC folds the strlen() call below with a conditional expression involving
constant operands but it fails to do the same for the equivalent strnlen()
call.
Besides missing this optimization opportunity it also prevents it from
diagnosing strnlen() calls with unterminated character arrays where the bound
is greater than the size of the array.
$ cat f.c && gcc -O2 -S -Wall -Wextra -Wnull-dereference
-fdump-tree-optimized=/dev/stdout f.c
const char a[4] = "123";
int f (int i)
{
return __builtin_strlen (i ? a : "");
}
int g (int i)
{
return __builtin_strnlen (i ? a : "", 4);
}
;; Function f (f, funcdef_no=0, decl_uid=1906, cgraph_uid=1, symbol_order=1)
Removing basic block 3
f (int i)
{
int prephitmp_7;
<bb 2> [local count: 1073741825]:
if (i_3(D) != 0)
goto <bb 4>; [50.00%]
else
goto <bb 3>; [50.00%]
<bb 3> [local count: 536870913]:
<bb 4> [local count: 1073741825]:
# prephitmp_7 = PHI <3(2), i_3(D)(3)>
return prephitmp_7;
}
;; Function g (g, funcdef_no=1, decl_uid=1909, cgraph_uid=2, symbol_order=2)
Removing basic block 3
g (int i)
{
long unsigned int _1;
const char * iftmp.1_2;
int _5;
<bb 2> [local count: 1073741825]:
if (i_3(D) != 0)
goto <bb 4>; [50.00%]
else
goto <bb 3>; [50.00%]
<bb 3> [local count: 536870913]:
<bb 4> [local count: 1073741825]:
# iftmp.1_2 = PHI <&a(2), ""(3)>
_1 = __builtin_strnlen (iftmp.1_2, 4);
_5 = (int) _1;
return _5;
}
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Subject: [Bug tree-optimization/86937] strnlen() of a conditional expression with constant operands not folded
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic,
| |missed-optimization
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=86936
Blocks| |83819
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
See also pr86936 for a similar issue.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83819
[Bug 83819] [meta-bug] missing strlen optimizations
>From gcc-bugs-return-612668-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 15:37:41 2018
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Subject: [Bug c++/86915] Segmentation fault for an array of auto in template parameter
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug c++/86915] Segmentation fault for an array of auto in template parameter
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Mon Aug 13 15:36:30 2018
New Revision: 263507
URL: https://gcc.gnu.org/viewcvs?rev=263507&root=gcc&view=rev
Log:
PR c++/86915
* decl.c (create_array_type_for_decl): Handle null name.
* g++.dg/diagnostic/auto1.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/diagnostic/auto1.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/decl.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-612669-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 15:53:31 2018
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Subject: [Bug target/86745] [9 regression] gcc.target/i386/avx-cvt-2.c etc. FAIL on 64-bit x86
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Andrey Guskov <andrey.y.guskov at intel dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |andrey.y.guskov at intel dot com
--- Comment #2 from Andrey Guskov <andrey.y.guskov at intel dot com> ---
Confirmed on Haswell.
The guilty revision is r263067.
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Subject: [Bug c++/86931] constexpr variable initialization: internal compiler error: in reshape_init_r, at cp/decl.c:6042
Date: Mon, 13 Aug 2018 16:11:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-13
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug target/86324] testsuite test divkc3-1.c FAILs when compiling with -mabi=ieeelongdouble
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Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|8.3 |9.0
--- Comment #8 from Peter Bergner <bergner at gcc dot gnu.org> ---
Ok, so we seemed to have missed the window for getting IEEE128 into GCC 8, so
unless some distro decides later on, that they want IEEE128 in GCC 8, I'm going
to skip backporting this and just leave it on trunk.
I will backport this to the IBM GCC 8 branch though.
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Subject: [Bug c++/86931] constexpr variable initialization: internal compiler error: in reshape_init_r, at cp/decl.c:6042
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
commit cf72f34dc248e4dea971f08dc370b07c9d7601e5
Author: jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon Oct 27 17:42:12 2014 +0000
Implement N3653 (Member initializers and aggregates) and fix
references to 'this' in constexpr constructors.
* class.c (check_field_decls): In C++14 an NSDMI does not make the
class non-aggregate.
* constexpr.c (struct constexpr_ctx): New.
(cxx_bind_parameters_in_call): Handle 'this'.
(cxx_eval_call_expression): Create new constexpr_ctx.
(cxx_eval_component_reference): Check CONSTRUCTOR_NO_IMPLICIT_ZERO.
(initialized_type, init_subob_ctx, verify_ctor_sanity): New.
(cxx_eval_bare_aggregate): Use them. Build CONSTRUCTOR early.
(cxx_eval_vec_init_1): Likewise.
(cxx_eval_constant_expression) [PARM_DECL]: Allow 'this'.
[TARGET_EXPR]: Build new constexpr_ctx.
[PLACEHOLDER_EXPR]: New.
(cxx_eval_outermost_constant_expr): Build new constexpr_ctx. Add
object parameter.
(is_sub_constant_expr): Build new constexpr_ctx.
(potential_constant_expression_1): Handle PLACEHOLDER_EXPR.
Allow 'this'.
* cp-gimplify.c (cp_gimplify_init_expr): Call replace_placeholders.
* cp-tree.h (CONSTRUCTOR_NO_IMPLICIT_ZERO): New.
* error.c (dump_expr): Handle PLACEHOLDER_EXPR.
* init.c (get_nsdmi): Generate PLACEHOLDER_EXPR.
* tree.c (lvalue_kind): Handle PLACEHOLDER_EXPR.
(build_ctor_subob_ref, replace_placeholders): New.
* typeck2.c (store_init_value): Use replace_placeholders.
(process_init_constructor_record): Make zero-init before NSDMI
explicit.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@216750
138bc75d-0d04-0410-961f-82ee72b054a4
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From: "quasicoherent at protonmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/86938] New: Invalid register name for r8w
Date: Mon, 13 Aug 2018 16:57:00 -0000
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Bug ID: 86938
Summary: Invalid register name for r8w
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: quasicoherent at protonmail dot com
Target Milestone: ---
Created attachment 44531
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44531&action=edit
-save-temps output
When compiling the following code:
#include <stdio.h>
int main() {
register unsigned short var __asm__("r8w") = 0;
__asm__ volatile (
"mov $123, %[var]\t\n"
: [var] "+rm" (var)
);
printf("%d\n", var);
return 0;
}
with
gcc -Wall -Wextra bug.c
I get the error:
bug.c: In function ‘main’:
bug.c:4:26: error: invalid register name for ‘var’
register unsigned short var __asm__("r8w") = 0;
^~~
If "r8w" is replaced by, for example, "ax" the compilation works and the
resulting program outputs "123\n", as desired.
gcc -v output:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.3.0-16ubuntu3'
--with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --with-as=/usr/bin/x86_64-linux-gnu-as
--with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-7
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)
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Subject: [Bug target/86938] Invalid register name for r8w
Date: Mon, 13 Aug 2018 17:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86938
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The rNd, rNw, and rNb aliases for rN (r8-r15) are not currently supported as
far as I can tell. Use r8 instead.
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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/85645] [7 Regression] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Date: Mon, 13 Aug 2018 17:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85645
--- Comment #16 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Mon Aug 13 17:05:48 2018
New Revision: 263509
URL: https://gcc.gnu.org/viewcvs?rev=263509&root=gcc&view=rev
Log:
Backport from mainline
2018-05-09 Segher Boessenkool <segher@kernel.crashing.org>
PR rtl-optimization/85645
* regrename.c (build_def_use): Also kill the chains that include the
destination of a REG_CFA_REGISTER note.
PR rtl-optimization/85645
* regcprop.c (copyprop_hardreg_forward_1): Don't propagate into an
insn that has a REG_CFA_REGISTER note.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/regcprop.c
branches/gcc-7-branch/gcc/regrename.c
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Subject: [Bug target/85644] [8/9 Regression] -fstack-protector generates invalid read to %fs:0x0 on mac
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
Some of the dups of this mentioned thread-local storage (TLS), in which case
bug 29838 and bug 52268 might be related
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Subject: [Bug c/86923] Missed optimization performing consecutive integer sum, loop not removed
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--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Isn't this bug 65855?
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Subject: [Bug middle-end/86757] [og8,nvptx] gangprivate related regressions
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jules at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
CC| |jules at gcc dot gnu.org
--- Comment #1 from jules at gcc dot gnu.org ---
I believe this is fixed in the patch posted upstream:
https://gcc.gnu.org/ml/gcc-patches/2018-08/msg00749.html
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Subject: [Bug c/86923] Missed optimization performing consecutive integer sum, loop not removed
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to joseph@codesourcery.com from comment #1)
> Isn't this bug 65855?
Yes
*** This bug has been marked as a duplicate of bug 65855 ***
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Subject: [Bug middle-end/65855] SCEV / SCCP missing optimization: triangular numbers
Date: Mon, 13 Aug 2018 17:26:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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CC| |nightstrike at gmail dot com
--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 86923 has been marked as a duplicate of this bug. ***
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Subject: [Bug rtl-optimization/85645] [7 Regression] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Date: Mon, 13 Aug 2018 17:27:00 -0000
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Arseny Solokha <asolokha at gmx dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #17 from Arseny Solokha <asolokha at gmx dot com> ---
Seems to be finally fixed for all active branches by the recent Segher's
backport.
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Subject: [Bug target/86324] testsuite test divkc3-1.c FAILs when compiling with -mabi=ieeelongdouble
Date: Mon, 13 Aug 2018 17:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86324
--- Comment #9 from Peter Bergner <bergner at gcc dot gnu.org> ---
Author: bergner
Date: Mon Aug 13 17:34:38 2018
New Revision: 263510
URL: https://gcc.gnu.org/viewcvs?rev=263510&root=gcc&view=rev
Log:
gcc/
Backport from mainline
2018-07-06 Peter Bergner <bergner@linux.ibm.com>
PR target/86324
* target.def (translate_mode_attribute): New hook.
* targhooks.h (default_translate_mode_attribute): Declare.
* targhooks.c (default_translate_mode_attribute): New function.
* doc/tm.texi.in (TARGET_TRANSLATE_MODE_ATTRIBUTE): New hook.
* doc/tm.texi: Regenerate.
* config/rs6000/rs6000.c (TARGET_TRANSLATE_MODE_ATTRIBUTE): Define.
(rs6000_translate_mode_attribute): New function.
gcc/c-family/
Backport from mainline
2018-07-06 Peter Bergner <bergner@linux.ibm.com>
PR target/86324
* c-attribs.c (handle_mode_attribute): Call new
translate_mode_attribute
target hook.
gcc/testsuite/
Backport from mainline
2018-07-06 Peter Bergner <bergner@linux.ibm.com>
PR target/86324
gcc.target/powerpc/pr86324-1.c: New test.
gcc.target/powerpc/pr86324-2.c: Likewise.
Added:
branches/ibm/gcc-8-branch/gcc/testsuite/ChangeLog.ibm
branches/ibm/gcc-8-branch/gcc/testsuite/gcc.target/powerpc/pr86324-1.c
branches/ibm/gcc-8-branch/gcc/testsuite/gcc.target/powerpc/pr86324-2.c
Modified:
branches/ibm/gcc-8-branch/gcc/ChangeLog.ibm
branches/ibm/gcc-8-branch/gcc/c-family/ChangeLog.ibm
branches/ibm/gcc-8-branch/gcc/c-family/c-attribs.c
branches/ibm/gcc-8-branch/gcc/config/rs6000/rs6000.c
branches/ibm/gcc-8-branch/gcc/doc/tm.texi
branches/ibm/gcc-8-branch/gcc/doc/tm.texi.in
branches/ibm/gcc-8-branch/gcc/target.def
branches/ibm/gcc-8-branch/gcc/targhooks.c
branches/ibm/gcc-8-branch/gcc/targhooks.h
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Subject: [Bug rtl-optimization/85645] [7 Regression] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Date: Mon, 13 Aug 2018 17:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85645
--- Comment #18 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Yes, and don't change resolution because something "seems".
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Subject: [Bug tree-optimization/71625] missing strlen optimization on different array initialization style
Date: Mon, 13 Aug 2018 17:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71625
--- Comment #17 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Mon Aug 13 17:57:51 2018
New Revision: 263511
URL: https://gcc.gnu.org/viewcvs?rev=263511&root=gcc&view=rev
Log:
PR tree-optimization/71625 - missing strlen optimization on different array
initialization style
gcc/c/ChangeLog:
PR tree-optimization/71625
* c-parser.c (c_parser_declaration_or_fndef): Call
braced_list_to_string.
gcc/c-family/ChangeLog:
PR tree-optimization/71625
* c-common.c (braced_list_to_string): New function.
* c-common.h (braced_list_to_string): Declare it.
gcc/cp/ChangeLog:
PR tree-optimization/71625
* decl.c (check_initializer): Call braced_list_to_string.
(eval_check_narrowing): New function.
* gcc/cp/typeck2.c (digest_init_r): Accept strings literals
as initilizers for all narrow character types.
gcc/testsuite/ChangeLog:
PR tree-optimization/71625
* g++.dg/init/string2.C: New test.
* g++.dg/init/string3.C: New test.
* g++.dg/init/string4.C: New test.
* gcc.dg/init-string-3.c: New test.
* gcc.dg/strlenopt-55.c: New test.
* gcc.dg/strlenopt-56.c: New test.
Added:
trunk/gcc/testsuite/g++.dg/init/string2.C
trunk/gcc/testsuite/g++.dg/init/string3.C
trunk/gcc/testsuite/g++.dg/init/string4.C
trunk/gcc/testsuite/gcc.dg/init-string-3.c
trunk/gcc/testsuite/gcc.dg/strlenopt-55.c
trunk/gcc/testsuite/gcc.dg/strlenopt-56.c
Modified:
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c-common.c
trunk/gcc/c-family/c-common.h
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-parser.c
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/decl.c
trunk/gcc/cp/typeck2.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/c-c++-common/attr-nonstring-3.c
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/86829] Missing sin(atan(x)) and cos(atan(x)) optimizations
Date: Mon, 13 Aug 2018 18:24:00 -0000
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--- Comment #5 from Giuliano Belinassi <giuliano.belinassi at usp dot br> ---
I filed the copyright assignment request and sent it to the assign at gnu dot
org. The patch itself I sent to the patch e-mail listing with the subject
"patch to bug #86829".
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Subject: [Bug rtl-optimization/86939] New: IRA incorrectly creates an interference between a pseudo register and a hard register
Date: Mon, 13 Aug 2018 18:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86939
Bug ID: 86939
Summary: IRA incorrectly creates an interference between a
pseudo register and a hard register
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
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Target Milestone: ---
IRA incorrectly creates an interference between a pseudo register and a hard
register that should not interfere, leading to an extra register copy that is
not needed:
bergner@pike:~/gcc/BUGS$ cat bug.i
typedef long (*fptr_t) (void);
long
func (fptr_t *p)
{
if (p)
return (*p) ();
return 0;
}
bergner@pike:~/gcc/BUGS$
/home/bergner/gcc/build/gcc-fsf-mainline-debug/gcc/xgcc
-B/home/bergner/gcc/build/gcc-fsf-mainline-debug/gcc -O2 -S bug.i
bergner@pike:~/gcc/BUGS$ cat bug.s
[snip]
ld 9,0(9)
std 2,24(1)
mtctr 9
mr 12,9
bctrl
The indirect call above requires r12 to be set before the bctrl, but we should
have just loaded its value directly into r12 instead of into r9. Looking at
the RTL during IRA, we have:
(insn 10 34 11 3 (set (reg/f:DI 125 [ *p_4(D) ])
(mem/f:DI (reg/v/f:DI 127 [orig:123 pD.2807 ] [123]) [1 *p_4(D)+0 S8
A64])) "bug.i":6 608 {*movdi_internal64}
(expr_list:REG_DEAD (reg/v/f:DI 127 [orig:123 pD.2807 ] [123])
(nil)))
(insn 11 10 12 3 (set (reg:DI 12 12)
(reg/f:DI 125 [ *p_4(D) ])) "bug.i":6 608 {*movdi_internal64}
(nil))
(call_insn 12 11 13 3 (parallel [
(set (reg:DI 3 3)
(call (mem:SI (reg/f:DI 125 [ *p_4(D) ]) [0 *_1 S4 A8])
(const_int 0 [0])))
(set (reg:DI 2 2)
(unspec:DI [
(const_int 24 [0x18])
] UNSPEC_TOCSLOT))
(clobber (reg:DI 65 lr))
]) "bug.i":6 691 {*call_value_indirect_elfv2di}
(expr_list:REG_DEAD (reg/f:DI 125 [ *p_4(D) ])
(expr_list:REG_DEAD (reg:DI 12 12)
(expr_list:REG_CALL_DECL (nil)
(nil))))
(expr_list (use (reg:DI 12 12))
(nil)))
(insn 13 12 31 3 (set (reg:DI 122 [ <retval> ])
(reg:DI 3 3)) "bug.i":6 608 {*movdi_internal64}
(expr_list:REG_DEAD (reg:DI 3 3)
(nil)))
(jump_insn 31 13 32 3 (set (pc)
(label_ref 18)) "bug.i":6 780 {jump}
(nil)
-> 18)
and:
Allocno a1r125 of GENERAL_REGS(29) has 28 avail. regs 0 3-11 14-31,
node: 0 3-11 14-31 (confl regs = 1 2 12 13 32-113)
Now pseudo 125 is live when r12 is defined, which is normally enough to make
two regs/pseudos interfere, but since they have the same value, an interference
should not be created between them. If we can stop the interference from being
generated, then we should get the allocation and code generated that we want.
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Subject: [Bug target/85904] [7/8 Regression] configure issue cross compiling on netbsd, with patch
Date: Mon, 13 Aug 2018 18:54:00 -0000
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--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Mon Aug 13 18:54:21 2018
New Revision: 263513
URL: https://gcc.gnu.org/viewcvs?rev=263513&root=gcc&view=rev
Log:
Revert "libstdc++-v3: Have aligned_alloc() on Newlib"
This reverts commit r263461 / 2e920cd849b3cf0a72df4f172e27676a3e70b73f
because aligned_alloc is not defined for baremetal newlib targets, see
https://gcc.gnu.org/ml/libstdc++/2018-08/msg00065.html
Revert
2018-08-10 Sebastian Huber <sebastian.huber@embedded-brains.de>
PR target/85904
* configure.ac: Define HAVE_ALIGNED_ALLOC if building for
Newlib.
* configure: Regenerate.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/configure
trunk/libstdc++-v3/configure.ac
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Subject: [Bug libstdc++/45093] Different definitions of _Rb_tree::{erase,_M_destroy_node} between C++98 and C++0x
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45093
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Mon Aug 13 18:54:43 2018
New Revision: 263516
URL: https://gcc.gnu.org/viewcvs?rev=263516&root=gcc&view=rev
Log:
PR libstdc++/45093 avoid warnings for _M_destroy_node
PR libstdc++/45093
* include/bits/stl_tree.h (_Rb_tree::_M_destroy_node(_Link_type)):
Combine definitions to avoid --detect-odr-violations warning.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/bits/stl_tree.h
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Subject: [Bug rtl-optimization/86939] IRA incorrectly creates an interference between a pseudo register and a hard register
Date: Mon, 13 Aug 2018 19:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86939
Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |law at gcc dot gnu.org,
| |segher at gcc dot gnu.org,
| |vmakarov at gcc dot gnu.org,
| |wschmidt at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |bergner at gcc dot gnu.org
--- Comment #1 from Peter Bergner <bergner at gcc dot gnu.org> ---
CC'ing Vlad and Jeff to make them aware of the issue, but I'll have a look at
fixing this.
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Subject: [Bug target/85904] [7/8 Regression] configure issue cross compiling on netbsd, with patch
Date: Mon, 13 Aug 2018 19:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85904
--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Mon Aug 13 19:16:02 2018
New Revision: 263518
URL: https://gcc.gnu.org/viewcvs?rev=263518&root=gcc&view=rev
Log:
Revert "libstdc++-v3: Have aligned_alloc() on Newlib"
This reverts commit r263463 / b7edd52337828cc46e469bca12f58288795b78d5
because aligned_alloc is not defined for baremetal newlib targets, see
https://gcc.gnu.org/ml/libstdc++/2018-08/msg00065.html
Revert
2018-08-10 Sebastian Huber <sebastian.huber@embedded-brains.de>
PR target/85904
* configure.ac: Define HAVE_ALIGNED_ALLOC if building for
Newlib.
* configure: Regenerate.
Modified:
branches/gcc-7-branch/libstdc++-v3/ChangeLog
branches/gcc-7-branch/libstdc++-v3/configure
branches/gcc-7-branch/libstdc++-v3/configure.ac
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Subject: [Bug target/85904] [7/8 Regression] configure issue cross compiling on netbsd, with patch
Date: Mon, 13 Aug 2018 19:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85904
--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Mon Aug 13 19:15:40 2018
New Revision: 263517
URL: https://gcc.gnu.org/viewcvs?rev=263517&root=gcc&view=rev
Log:
Revert "libstdc++-v3: Have aligned_alloc() on Newlib"
This reverts commit r263462 / 61b760a78fdf9f5d87b0b626a61a3216bd1411fc
because aligned_alloc is not defined for baremetal newlib targets, see
https://gcc.gnu.org/ml/libstdc++/2018-08/msg00065.html
Revert
2018-08-10 Sebastian Huber <sebastian.huber@embedded-brains.de>
PR target/85904
* configure.ac: Define HAVE_ALIGNED_ALLOC if building for
Newlib.
* configure: Regenerate.
Modified:
branches/gcc-8-branch/libstdc++-v3/ChangeLog
branches/gcc-8-branch/libstdc++-v3/configure
branches/gcc-8-branch/libstdc++-v3/configure.ac
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Subject: [Bug bootstrap/81033] [8/9 Regression] there are cases where ld64 is not able to determine correct atom boundaries from the output GCC currently produces
Date: Mon, 13 Aug 2018 21:03:00 -0000
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--- Comment #42 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Elliot Saba from comment #41)
> Has there been any progress on this? We are running into this while trying
> to cross-compile GCC for Darwin. Has this been fixed in 8.3.0?
I will be posting two patches (one just posted today) that are my proposed
solution - basically, v2 above plus removing a target hook.
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Subject: [Bug sanitizer/86755] [ASAN] Libasan failed to be build for arm with -mthumb and -fno-omit-frame-pointer
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chefmax at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |chefmax at gcc dot gnu.org
--- Comment #1 from chefmax at gcc dot gnu.org ---
Upstream review: https://reviews.llvm.org/D50180
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From: "aerkiaga6 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/86940] New: False positive with -Wuninitialized
Date: Mon, 13 Aug 2018 21:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86940
Bug ID: 86940
Summary: False positive with -Wuninitialized
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: aerkiaga6 at gmail dot com
Target Milestone: ---
Created attachment 44532
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44532&action=edit
Preprocessed source
Compiling the code with the following command:
gcc -v -save-temps -Wall -O test.c
Gives this output:
gcc -v -save-temps -Wall -O test.c
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/8.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-8.2.0/configure --enable-languages=c,c++
Thread model: posix
gcc version 8.2.0 (GCC)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-O' '-mtune=generic'
'-march=x86-64'
/usr/local/libexec/gcc/x86_64-pc-linux-gnu/8.2.0/cc1 -E -quiet -v -imultiarch
x86_64-linux-gnu test.c -mtune=generic -march=x86-64 -Wall -O -fpch-preprocess
-o test.i
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include
/usr/local/include
/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-O' '-mtune=generic'
'-march=x86-64'
/usr/local/libexec/gcc/x86_64-pc-linux-gnu/8.2.0/cc1 -fpreprocessed test.i
-quiet -dumpbase test.c -mtune=generic -march=x86-64 -auxbase test -O -Wall
-version -o test.s
GNU C17 (GCC) version 8.2.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 8.2.0, GMP version 6.1.2, MPFR version 4.0.1,
MPC version 1.1.0, isl version isl-0.19-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C17 (GCC) version 8.2.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 8.2.0, GMP version 6.1.2, MPFR version 4.0.1,
MPC version 1.1.0, isl version isl-0.19-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 82490e2e2080530dcab0165c2e5082fa
test.c: In function ‘main’:
test.c:15:20: warning: ‘str’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
if(initialize) free(str);
^~~~~~~~~
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-O' '-mtune=generic'
'-march=x86-64'
/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/../../../../x86_64-pc-linux-gnu/bin/as
-v --64 -o test.o test.s
GNU assembler version 2.31.1 (x86_64-pc-linux-gnu) using BFD version (GNU
Binutils) 2.31.1
COMPILER_PATH=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/8.2.0/:/usr/local/libexec/gcc/x86_64-pc-linux-gnu/8.2.0/:/usr/local/libexec/gcc/x86_64-pc-linux-gnu/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/../../../../x86_64-pc-linux-gnu/bin/
LIBRARY_PATH=/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/../../../../lib64/:/lib/x86_64-linux-gnu/:/lib/../lib64/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib64/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/../../../../x86_64-pc-linux-gnu/lib/:/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-O' '-mtune=generic'
'-march=x86-64'
/usr/local/libexec/gcc/x86_64-pc-linux-gnu/8.2.0/collect2 -plugin
/usr/local/libexec/gcc/x86_64-pc-linux-gnu/8.2.0/liblto_plugin.so
-plugin-opt=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/8.2.0/lto-wrapper
-plugin-opt=-fresolution=test.res -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s
--eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2
/usr/lib/x86_64-linux-gnu/crt1.o /usr/lib/x86_64-linux-gnu/crti.o
/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/crtbegin.o
-L/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0
-L/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/../../../../lib64
-L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu
-L/usr/lib/../lib64
-L/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/../../../../x86_64-pc-linux-gnu/lib
-L/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/../../.. test.o -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/local/lib/gcc/x86_64-pc-linux-gnu/8.2.0/crtend.o
/usr/lib/x86_64-linux-gnu/crtn.o
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-O' '-mtune=generic'
'-march=x86-64'
GCC complains that 'str' may be uninitialized, which is not possible.
Requirements for triggering the bug include compiling with -O1 or greater.
Omitting this flag gives no warning. Also, no warning is produced if func()
returns just a constant value.
It appears like GCC thinks that func() may have some side effects which change
the value of initialize, which is not the case.
Also, while substituting the call to free() with another expression with str
(e.g. puts(str) or printf("%p", str)) does not remove the warning, the call to
malloc() turns out to be important. Replacing it with a constant value makes
the warning dissapear, regardless of the expression used in place of free().
>From gcc-bugs-return-612695-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 21:34:20 2018
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
How does GCC know that rand does not change the global variable initialize? Or
something else before main has changed it from 1 to 0?
>From gcc-bugs-return-612696-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 21:46:08 2018
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Subject: [Bug middle-end/86940] False positive with -Wuninitialized
Date: Mon, 13 Aug 2018 21:45:00 -0000
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--- Comment #2 from Aritz Erkiaga <aerkiaga6 at gmail dot com> ---
I don't know. Somehow it does know it when the testcase is compiled without any
-O flags, but it not something trivial, and so I would not be surprised if GCC
were not able to get that information.
>From gcc-bugs-return-612697-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 21:47:52 2018
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Subject: [Bug middle-end/86940] False positive with -Wuninitialized
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Aritz Erkiaga from comment #2)
> I don't know. Somehow it does know it when the testcase is compiled without
> any -O flags, but it not something trivial, and so I would not be surprised
> if GCC were not able to get that information.
Because without any -O option (aka -O0) GCC does not enable any flow based
uninitilization checking.
>From gcc-bugs-return-612698-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 22:11:46 2018
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Subject: [Bug middle-end/86940] False positive with -Wuninitialized
Date: Mon, 13 Aug 2018 22:11:00 -0000
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--- Comment #4 from Aritz Erkiaga <aerkiaga6 at gmail dot com> ---
Ok, then this is not a bug. Maybe a feature request?
Well, actually I think it would be safe for the compiler to assume that libc
(and possibly other external libraries) don't have access to variables defined
in the source file being compiled. Of course, they could do whatever they like,
but the possibility is not worth a warning, as I see it.
>From gcc-bugs-return-612699-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 23:08:24 2018
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Subject: [Bug debug/86941] New: ICE in i386/winnt.c:1258 in i386_pe_seh_unwind_emit
Date: Mon, 13 Aug 2018 23:08:00 -0000
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Bug ID: 86941
Summary: ICE in i386/winnt.c:1258 in i386_pe_seh_unwind_emit
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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Target Milestone: ---
The following code from the stack-trace-7.c testsuite case causes an ICE on
x86_64-w64-mingw32:
/* { dg-do run } */
/* { dg-options "-O2 -fstack-clash-protection -fno-optimize-sibling-calls
--param stack-clash-protection-probe-interval=12 --param
stack-clash-protection-guard-size=12" } */
/* { dg-require-effective-target supports_stack_clash_protection } */
/* For further testing, this can be run under valgrind where it's crashed
on aarch64 and ppc64le with -fstack-check=specific. */
__attribute__((noinline, noclone)) void
foo (char *p)
{
asm volatile ("" : : "r" (p) : "memory");
}
__attribute__((noinline, noclone)) void
bar (void)
{
char buf[131072];
foo (buf);
}
__attribute__((noinline, noclone)) void
baz (void)
{
char buf[12000];
foo (buf);
}
int
main ()
{
bar ();
baz ();
return 0;
}
stack-check-7.c:20:1: internal compiler error: in i386_pe_seh_unwind_emit, at
config/i386/winnt.c:1258
0x71157e i386_pe_seh_unwind_emit(_IO_FILE*, rtx_insn*)
../../../gccsvn/gcc/config/i386/winnt.c:1258
0x9e174a final_scan_insn_1
../../../gccsvn/gcc/final.c:3110
0x9e1c3b final_scan_insn(rtx_insn*, _IO_FILE*, int, int, int*)
../../../gccsvn/gcc/final.c:3146
0x9e1f04 final_1
../../../gccsvn/gcc/final.c:2019
0x9e2c64 rest_of_handle_final
../../../gccsvn/gcc/final.c:4657
0x9e2c64 execute
../../../gccsvn/gcc/final.c:4731
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
winnt.c:
case REG_CFA_DEF_CFA:
case REG_CFA_EXPRESSION:
/* Only emitted with DRAP and aligned memory access using a
realigned SP, both of which we disable. */
gcc_unreachable ();
break;
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Subject: [Bug c++/57891] No diagnostic of narrowing conversion in non-type template argument
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--- Comment #11 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Mon Aug 13 23:12:11 2018
New Revision: 263523
URL: https://gcc.gnu.org/viewcvs?rev=263523&root=gcc&view=rev
Log:
PR c++/57891
* call.c (struct conversion): Add check_narrowing_const_only.
(build_converted_constant_expr): Set check_narrowing and
check_narrowing_const_only. Give error if expr is error node.
(convert_like_real): Pass it to check_narrowing.
* cp-tree.h (check_narrowing): Add a default parameter.
* decl.c (compute_array_index_type): Use input_location instead of
location_of.
* pt.c (convert_nontype_argument): Return NULL_TREE if tf_error.
* typeck2.c (check_narrowing): Don't warn for instantiation-dependent
expressions. Call maybe_constant_value instead of
fold_non_dependent_expr. Don't mention { } in diagnostic. Only check
narrowing for constants if CONST_ONLY.
* g++.dg/cpp0x/Wnarrowing6.C: New test.
* g++.dg/cpp0x/Wnarrowing7.C: New test.
* g++.dg/cpp0x/Wnarrowing8.C: New test.
* g++.dg/cpp0x/Wnarrowing9.C: New test.
* g++.dg/cpp0x/Wnarrowing10.C: New test.
* g++.dg/cpp0x/constexpr-47969.C: Adjust dg-error.
* g++.dg/cpp0x/constexpr-ex2.C: Likewise.
* g++.dg/cpp0x/constexpr-targ.C: Likewise.
* g++.dg/cpp0x/scoped_enum2.C: Likewise.
* g++.dg/ext/stmtexpr15.C: Likewise.
* g++.dg/gomp/pr47963.C: Likewise.
* g++.dg/init/new37.C: Likewise.
* g++.dg/init/new43.C: Likewise.
* g++.dg/other/fold1.C: Likewise.
* g++.dg/parse/array-size2.C: Likewise.
* g++.dg/template/dependent-name3.C: Likewise.
* g++.dg/cpp0x/constexpr-data2.C: Add dg-error.
* g++.dg/other/vrp1.C: Likewise.
* g++.dg/template/char1.C: Likewise.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/Wnarrowing10.C
trunk/gcc/testsuite/g++.dg/cpp0x/Wnarrowing6.C
trunk/gcc/testsuite/g++.dg/cpp0x/Wnarrowing7.C
trunk/gcc/testsuite/g++.dg/cpp0x/Wnarrowing8.C
trunk/gcc/testsuite/g++.dg/cpp0x/Wnarrowing9.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/cp/cp-tree.h
trunk/gcc/cp/decl.c
trunk/gcc/cp/pt.c
trunk/gcc/cp/typeck2.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-47969.C
trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-data2.C
trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-ex2.C
trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-targ.C
trunk/gcc/testsuite/g++.dg/cpp0x/scoped_enum2.C
trunk/gcc/testsuite/g++.dg/ext/stmtexpr15.C
trunk/gcc/testsuite/g++.dg/gomp/pr47963.C
trunk/gcc/testsuite/g++.dg/init/new37.C
trunk/gcc/testsuite/g++.dg/init/new43.C
trunk/gcc/testsuite/g++.dg/other/fold1.C
trunk/gcc/testsuite/g++.dg/other/vrp1.C
trunk/gcc/testsuite/g++.dg/parse/array-size2.C
trunk/gcc/testsuite/g++.dg/template/char1.C
trunk/gcc/testsuite/g++.dg/template/dependent-name3.C
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Subject: [Bug c++/57891] No diagnostic of narrowing conversion in non-type template argument
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #12 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed for GCC 9.
>From gcc-bugs-return-612702-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 13 23:46:18 2018
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/65043] Expected narrowing conversion during list initialization of bool from double
Date: Mon, 13 Aug 2018 23:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65043
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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CC| |mpolacek at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
>From gcc-bugs-return-612703-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 01:10:56 2018
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From: "blitzrakete at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86942] New: A trailing-return-type is allowed when the return type is not 'auto' for using declarations
Date: Tue, 14 Aug 2018 01:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86942
Bug ID: 86942
Summary: A trailing-return-type is allowed when the return type
is not 'auto' for using declarations
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: blitzrakete at gmail dot com
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void test() -> void; // fail => ok
using function = void() -> int; // allowed?!?
int f();
int main() {
function *Boo = f; // not ok; trailing return type is ignored
}
The above code fails to compile on the latest gcc trunk. It is invalid as a
trailing-return-type can only appear if the return type of the function is
'auto'.
No arguments to g++ necessary. Online demo: https://godbolt.org/g/XtSw6T
>From gcc-bugs-return-612704-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 01:46:23 2018
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From: "oremanj at mit dot edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86943] New: [8 Regression] Wrong code when converting stateless generic lambda to function pointer
Date: Tue, 14 Aug 2018 01:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86943
Bug ID: 86943
Summary: [8 Regression] Wrong code when converting stateless
generic lambda to function pointer
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: oremanj at mit dot edu
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When creating a function pointer from a stateless generic lambda that accepts
the argument of generic type by value, gcc 8+ on x86_64 generates wrong code,
invoking a move constructor on a pointer-to-pointer to the moved-from object
rather than just a pointer to it. This occurs regardless of optimizations as
far as I can tell.
$ cat t.cc
extern "C" int printf(const char *fmt, ...);
struct nontrivial
{
nontrivial() { printf("default-construct %p\n", this); }
nontrivial(const nontrivial& other)
{ printf("copy-construct %p from %p\n", this, &other); }
nontrivial(nontrivial&& other) noexcept
{ printf("move-construct %p from %p\n", this, &other); }
~nontrivial()
{ printf("destroy %p\n", this); }
};
using cb_t = void(*)(nontrivial);
cb_t test()
{
return [](auto val) { printf("called %p\n", &val); };
}
int main()
{
volatile cb_t cb = test();
cb({});
return 0;
}
$ g++-7 -o t.ok t.cc -std=c++14
$ ./t.ok
default-construct 0x7ffc6cf08b0f
move-construct 0x7ffc6cf08adf from 0x7ffc6cf08b0f
called 0x7ffc6cf08adf
destroy 0x7ffc6cf08adf
destroy 0x7ffc6cf08b0f
$ g++-8 -o t.fail t.cc -std=c++14
$ ./t.fail
default-construct 0x7fffd8a636ff
move-construct 0x7fffd8a636c7 from 0x7fffd8a636c8
called 0x7fffd8a636c7
destroy 0x7fffd8a636c7
destroy 0x7fffd8a636ff
In the second example, the object is move-constructed from an address at which
no object has been constructed. Examining in a debugger, 0x7fffd8a636c8
contains the address 0x7fffd8a636ff, i.e., there is one level of indirection
too many.
Tested with godbolt.org, bug is absent on 7.1.0, 7.2.0, 7.3.0, and present on
8.1.0, 8.2.0, and 9.0.0 20180812.
>From gcc-bugs-return-612705-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 02:21:27 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/50676] Partitioning may fail with presence of static variables referring to function labels
Date: Tue, 14 Aug 2018 02:21:00 -0000
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--- Comment #7 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Andi Kleen from comment #6)
> The patch doesn't seem to be checked in yet. Is there a reason for that?
Maybe people just forgot about it?
>From gcc-bugs-return-612706-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 02:29:01 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/86940] False positive with -Wuninitialized
Date: Tue, 14 Aug 2018 02:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86940
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
CC| |msebor at gcc dot gnu.org
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
(In reply to Aritz Erkiaga from comment #4)
GCC does have knowledge about many libc functions but rand() isn't one of them
(yet). It would be possible to add rand() to the list but it would only solve
this one test case (i.e., involving rand()). I don't think adding a built-in
just to avoid a -Wuninitialized in this case is worth it. There may be other
reasons to add it, such as constraining its return value to [0, RAND_MAX]. If
you can make a more compelling case for it there's a decent chance that it will
be added.
Barring that, the test case reduces to:
$ cat pr86940.c && gcc -O2 -S -Wall pr86940.c
int f (void);
void g (void)
{
void *p;
if (f ())
p = __builtin_malloc (8);
if (f ())
__builtin_free (p);
}
pr86940.c: In function ‘g’:
pr86940.c:10:5: warning: ‘p’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
__builtin_free (p);
^~~~~~~~~~~~~~~~~~
>From gcc-bugs-return-612707-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 07:20:03 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86944] New: ICE in vectorizable_store, at tree-vect-stmts.c:6878 on aarch64
Date: Tue, 14 Aug 2018 07:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86944
Bug ID: 86944
Summary: ICE in vectorizable_store, at tree-vect-stmts.c:6878
on aarch64
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: rdsandiford at googlemail dot com
Target Milestone: ---
Following ICEs:
$ ./xgcc -B.
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-ssa/pr66449.c
-mstrict-align -Ofast --param vect-epilogues-nomask=1
during GIMPLE pass: vect
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-ssa/pr66449.c: In
function ‘fn1’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-ssa/pr66449.c:8:7:
internal compiler error: in vectorizable_store, at tree-vect-stmts.c:6878
8 | void *fn1(void *p1, void *p2, long p3)
| ^~~
0x13a9726 vectorizable_store
/home/marxin/Programming/gcc/gcc/tree-vect-stmts.c:6878
0x13b36b2 vect_transform_stmt(_stmt_vec_info*, gimple_stmt_iterator*,
_slp_tree*, _slp_instance*)
/home/marxin/Programming/gcc/gcc/tree-vect-stmts.c:9721
0x13d7831 vect_transform_loop_stmt
/home/marxin/Programming/gcc/gcc/tree-vect-loop.c:8228
0x13d8585 vect_transform_loop(_loop_vec_info*)
/home/marxin/Programming/gcc/gcc/tree-vect-loop.c:8450
0x13fef2f try_vectorize_loop_1
/home/marxin/Programming/gcc/gcc/tree-vectorizer.c:945
0x13ff10d try_vectorize_loop_1
/home/marxin/Programming/gcc/gcc/tree-vectorizer.c:978
0x13ff1c9 try_vectorize_loop
/home/marxin/Programming/gcc/gcc/tree-vectorizer.c:995
0x13ff3a5 vectorize_loops()
/home/marxin/Programming/gcc/gcc/tree-vectorizer.c:1077
0x128e3e1 execute
/home/marxin/Programming/gcc/gcc/tree-ssa-loop.c:414
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-612708-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 07:25:07 2018
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Subject: [Bug target/86944] ICE in vectorizable_store, at tree-vect-stmts.c:6878 on aarch64
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2018-8-14
CC| |kyrylo.tkachov at arm dot com,
| |ramana at gcc dot gnu.org
Target Milestone|--- |7.4
Known to fail| |7.3.0, 8.2.0, 9.0
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86943] [8/9 Regression] Wrong code when converting stateless generic lambda to function pointer
Date: Tue, 14 Aug 2018 07:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86943
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-14
CC| |jason at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Known to work| |7.3.0
Target Milestone|--- |9.0
Summary|[8 Regression] Wrong code |[8/9 Regression] Wrong code
|when converting stateless |when converting stateless
|generic lambda to function |generic lambda to function
|pointer |pointer
Ever confirmed|0 |1
Known to fail| |8.2.0, 9.0
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r239268.
>From gcc-bugs-return-612710-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 07:44:52 2018
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From: "daniel.price at monash dot edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/86945] New: BUG with optimisation of select case statement in gfortran v8.x
Date: Tue, 14 Aug 2018 07:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86945
Bug ID: 86945
Summary: BUG with optimisation of select case statement in
gfortran v8.x
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: daniel.price at monash dot edu
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Created attachment 44533
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44533&action=edit
test code to reproduce error
Dear gfortran folks,
Users reported that gfortran-v8.x completely breaks my splash visualisation
tool (http://users.monash.edu.au/~splash). I tracked this down to a bug with
optimisation of the select case statement in gfortran v8.2.0.
Test code with simple example attached. Enter "1" as the input, and output
should be zero (i.e. correct behaviour is to report error code if id is
negative). However, with various levels of optimisation the output I get is as
follows:
$ gfortran-mp-8 -O3 -o test test.f90
$ ./test
enter id
1
ierr = 1
$ gfortran-mp-8 -O1 -o test test.f90
$ ./test
enter id
1
ierr = 1
$ gfortran-mp-8 -o test test.f90
$ ./test
enter id
1
ierr = 0
Please fix this urgently! The outcome for users is that no plotting devices are
opened, because the program incorrectly returns an error code, and therefore
stops execution.
Compiler version as follows:
$ gfortran-mp-8 -v
Using built-in specs.
COLLECT_GCC=gfortran-mp-8
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin17/8.2.0/lto-wrapper
Target: x86_64-apple-darwin17
Configured with:
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_gcc8/gcc8/work/gcc-8.2.0/configure
--prefix=/opt/local --build=x86_64-apple-darwin17
--enable-languages=c,c++,objc,obj-c++,lto,fortran --libdir=/opt/local/lib/gcc8
--includedir=/opt/local/include/gcc8 --infodir=/opt/local/share/info
--mandir=/opt/local/share/man --datarootdir=/opt/local/share/gcc-8
--with-local-prefix=/opt/local --with-system-zlib --disable-nls
--program-suffix=-mp-8 --with-gxx-include-dir=/opt/local/include/gcc8/c++/
--with-gmp=/opt/local --with-mpfr=/opt/local --with-mpc=/opt/local
--with-isl=/opt/local --enable-stage1-checking --disable-multilib --enable-lto
--enable-libstdcxx-time --with-build-config=bootstrap-debug
--with-as=/opt/local/bin/as --with-ld=/opt/local/bin/ld
--with-ar=/opt/local/bin/ar --with-bugurl=https://trac.macports.org/newticket
--disable-tls --with-pkgversion='MacPorts gcc8 8.2.0_0'
Thread model: posix
gcc version 8.2.0 (MacPorts gcc8 8.2.0_0)
>From gcc-bugs-return-612711-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 07:54:23 2018
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From: "yamirenk at ya dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86921] do not remove input in bash
Date: Tue, 14 Aug 2018 07:54:00 -0000
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Yakov <yamirenk at ya dot ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |INVALID
--- Comment #3 from Yakov <yamirenk at ya dot ru> ---
(In reply to Jonathan Wakely from comment #2)
> If you're saying that data read from the terminal by std::cin cannot be
> "un-read" by typing backspace, that's correct. That is not a GCC bug, it's
> just how the OS works.
>
> In the default line-buffered mode, when you hit Enter the line is sent to
> the application. Typing backspace cannot undo that, the program has already
> read the data, and doesn't receive the backspace characters.
ok, thanks
>From gcc-bugs-return-612712-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 07:58:48 2018
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Subject: [Bug c++/86946] New: ice: canonical types differ for identical types
Date: Tue, 14 Aug 2018 07:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86946
Bug ID: 86946
Summary: ice: canonical types differ for identical types
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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This C++ source code
template <typename a, typename c> auto d(a, c);
template <long> class e;
template <unsigned long f, unsigned b, typename> e<d(f, b)> d();
template <unsigned long f, unsigned b, typename> e<d(f, b)> d();
causes this ice:
bug456.cc:4:63: internal compiler error: canonical types differ for identical
ty
pes ‘e<d(f, b)>’ and ‘e<d(f, b)>’
4 | template <unsigned long f, unsigned b, typename> e<d(f, b)> d();
| ^
0xa0a331 comptypes(tree_node*, tree_node*, int)
../../trunk/gcc/cp/typeck.c:1477
0x87ce6a decls_match(tree_node*, tree_node*, bool)
../../trunk/gcc/cp/decl.c:968
0x87d24f decls_match(tree_node*, tree_node*, bool)
../../trunk/gcc/cp/decl.c:1036
0x87d416 duplicate_decls(tree_node*, tree_node*, bool)
../../trunk/gcc/cp/decl.c:1363
The bug seems to be present since sometime before revision 262519
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From: "yamirenk at ya dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86921] do not remove input in bash
Date: Tue, 14 Aug 2018 07:59:00 -0000
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Yakov <yamirenk at ya dot ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |WAITING
Resolution|INVALID |---
>From gcc-bugs-return-612714-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 08:03:59 2018
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From: "yamirenk at ya dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86921] do not remove input in bash
Date: Tue, 14 Aug 2018 08:03:00 -0000
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--- Comment #4 from Yakov <yamirenk at ya dot ru> ---
(In reply to Jonathan Wakely from comment #2)
> If you're saying that data read from the terminal by std::cin cannot be
> "un-read" by typing backspace, that's correct. That is not a GCC bug, it's
> just how the OS works.
>
> In the default line-buffered mode, when you hit Enter the line is sent to
> the application. Typing backspace cannot undo that, the program has already
> read the data, and doesn't receive the backspace characters.
I am sorry. I think, I did mistake in my question. I did not press Enter.
>From gcc-bugs-return-612715-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 08:26:34 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86921] do not remove input in bash
Date: Tue, 14 Aug 2018 08:26:00 -0000
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Yakov from comment #4)
> I am sorry. I think, I did mistake in my question. I did not press Enter.
You said "when the second line begins. symbols, entered in first line"
If that doesn't mean you pressed Enter, you need to tell us what you did. We
can't guess.
See https://gcc.gnu.org/bugs/
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From: "vinay.kumar at blackfigtech dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/86947] New: Erroneous code generated with O2 and O3 for PPC
Date: Tue, 14 Aug 2018 08:27:00 -0000
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Bug ID: 86947
Summary: Erroneous code generated with O2 and O3 for PPC
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
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Reporter: vinay.kumar at blackfigtech dot com
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Created attachment 44534
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44534&action=edit
Testcase to reproduce the bug.
$powerpc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/data/home/toolchain/ppc/prefix/bin/powerpc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/data/home/toolchain/ppc/prefix/bin/../libexec/gcc/powerpc-linux-gnu/8.1.0/lto-wrapper
Target: powerpc-linux-gnu
Configured with: /data/home/toolchain/ppc/build/../src/gcc-8.1.0/configure
--target=powerpc-linux-gnu --prefix=/data/home/toolchain/ppc/build/../prefix
--disable-nls --enable-languages=c,c++ --enable-targets=all --disable-multilib
--disable-libsanitizer --enable-threads --enable-tls --enable-__cxa_atexit
--enable-secureplt --with-gmp=/data/home/toolchain/gmp-mpfr-mpc/prefix
--with-mpfr=/data/home/toolchain/gmp-mpfr-mpc/prefix
--with-mpc=/data/home/toolchain/gmp-mpfr-mpc/prefix
--prefix=/data/home/toolchain/ppc/build/../prefix
Thread model: posix
gcc version 8.1.0 (GCC)
The testcase was compiled using following command and options:-
$powerpc-linux-gnu-gcc -m64 -O2 test.c -S
Please note the following chunk of code in the assembly file:-
There is a comparison of the registers R7 and R31.
However, the register R31 is not being initialized and optimized away
and generating wrong code.
========================================================
.L4:
addis 9,2,.LC2@toc@ha
ld 9,.LC2@toc@l(9)
lfd 12,0(9)nd
fcmpu 7,12,31
bng 7,.L20
stfd 31,112(1)
========================================================
We have investigated this issue and observed that its not observed with
O1 and Os optimization levels. Its only been the issue with O2 & O3.
The generated code was correct on disabling the optimization flags
"fno-tree-pre" and "fno-gcse" for O2 flags. It was also investigated on
the earlier GCC source code and observed that issue is present atleast
until gcc-4.3.3 sources.
Thanks,
Vinay Kumar
>From gcc-bugs-return-612717-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 08:30:35 2018
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Subject: [Bug c++/86942] A trailing-return-type is allowed when the return type is not 'auto' for using declarations
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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>From gcc-bugs-return-612718-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 08:34:14 2018
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From: "yamirenk at ya dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86921] do not remove input in bash
Date: Tue, 14 Aug 2018 08:34:00 -0000
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--- Comment #6 from Yakov <yamirenk at ya dot ru> ---
(In reply to Jonathan Wakely from comment #5)
> (In reply to Yakov from comment #4)
> > I am sorry. I think, I did mistake in my question. I did not press Enter.
>
> You said "when the second line begins. symbols, entered in first line"
>
> If that doesn't mean you pressed Enter, you need to tell us what you did. We
> can't guess.
>
> See https://gcc.gnu.org/bugs/
ok. bash:
$./test
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(here is the end of the first line)
aa(then I press Backspace many times)
I see:
$./test
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(this symbols I can not remove)
>From gcc-bugs-return-612719-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 08:36:41 2018
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Subject: [Bug c++/86921] do not remove input in bash
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Andreas Schwab <schwab@linux-m68k.org> changed:
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--- Comment #7 from Andreas Schwab <schwab@linux-m68k.org> ---
This has nothing to do with gcc, it is a property of the terminal emulation.
>From gcc-bugs-return-612720-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 08:41:02 2018
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From: "yamirenk at ya dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86921] do not remove input in bash
Date: Tue, 14 Aug 2018 08:41:00 -0000
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--- Comment #8 from Yakov <yamirenk at ya dot ru> ---
(In reply to Andreas Schwab from comment #7)
> This has nothing to do with gcc, it is a property of the terminal emulation.
ok. all my terminals have this problem)=
thanks for help
>From gcc-bugs-return-612721-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 08:49:02 2018
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Subject: [Bug libstdc++/70472] is_copy_constructible<vector<unique_ptr<int>>>::value is true
Date: Tue, 14 Aug 2018 08:49:00 -0000
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Simon Brand <simonrbrand at gmail dot com> changed:
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--- Comment #13 from Simon Brand <simonrbrand at gmail dot com> ---
Is there any decent workaround for this for pre-GCC8 users? My current approach
is to add specializations to my own trait whenever a user of my library needs
support for types with this issue. I can happily use intrinsics if some would
make this easier.
>From gcc-bugs-return-612722-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 09:25:35 2018
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From: "rsandifo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86871] [8/9 Regression] ICE: gimple check: expected gimple_assign(error_mark), have gimple_call(trunc_mod_expr) in gimple_assign_lhs, at gimple.h:2462
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--- Comment #9 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Author: rsandifo
Date: Tue Aug 14 09:24:45 2018
New Revision: 263528
URL: https://gcc.gnu.org/viewcvs?rev=263528&root=gcc&view=rev
Log:
Fix invalid assumption in vect_transform_stmt (PR 86871)
The handling of outer-loop uses of inner-loop definitions assumed
that anything that wasn't a PHI would be a gassign. It's also
possible for it to be a gcall.
2018-08-14 Richard Sandiford <richard.sandiford@arm.com>
gcc/
Backport from mainline
2018-08-09 Richard Sandiford <richard.sandiford@arm.com>
PR tree-optimization/86871
* tree-vect-stmts.c (vect_transform_stmt): Use gimple_get_lhs
instead of gimple_assign_lhs.
gcc/testsuite/
Backport from mainline
2018-08-09 Richard Sandiford <richard.sandiford@arm.com>
PR tree-optimization/86871
* gcc.dg/vect/pr86871.c: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/gcc.dg/vect/pr86871.c
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/testsuite/ChangeLog
branches/gcc-8-branch/gcc/tree-vect-stmts.c
>From gcc-bugs-return-612723-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 09:26:38 2018
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Subject: [Bug c++/86871] [8/9 Regression] ICE: gimple check: expected gimple_assign(error_mark), have gimple_call(trunc_mod_expr) in gimple_assign_lhs, at gimple.h:2462
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
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--- Comment #10 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Fixed on trunk and GCC 8 branch. Thanks for the bug report.
>From gcc-bugs-return-612724-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 09:36:55 2018
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From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/86944] ICE in vectorizable_store, at tree-vect-stmts.c:6878 on aarch64
Date: Tue, 14 Aug 2018 09:36:00 -0000
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ktkachov at gcc dot gnu.org changed:
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--- Comment #1 from ktkachov at gcc dot gnu.org ---
Confirmed on the branches from GCC 7 onwards.
Doesn't look like a target bug to me though. Looks like the vectoriser doesn't
deal with some alignment info properly (to my uneducated eye).
>From gcc-bugs-return-612725-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 11:14:43 2018
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From: "jamborm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug hsa/86948] New: Internal compiler error compiling brig.dg/test/gimple/mulhi.hsail
Date: Tue, 14 Aug 2018 11:14:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86948
Bug ID: 86948
Summary: Internal compiler error compiling
brig.dg/test/gimple/mulhi.hsail
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: hsa
Assignee: unassigned at gcc dot gnu.org
Reporter: jamborm at gcc dot gnu.org
CC: jamborm at gcc dot gnu.org, marxin at gcc dot gnu.org
Target Milestone: ---
Created attachment 44535
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44535&action=edit
BRIG input
At some point in the last two weeks, brig.dg/test/gimple/mulhi.hsail started
failing with and ICE. Command-line reproducer (with the attached input) is:
$ ~/gcc/small/inst/bin/gccbrig mulhi.hsail.brig -S
during RTL pass: expand
In function ‘_Kernel’:
brig1: internal compiler error: in expand_expr_real_2, at expr.c:8918
0x868d36 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
/home/mjambor/gcc/small/src/gcc/expr.c:8918
0x702e6a expand_gimple_stmt_1
/home/mjambor/gcc/small/src/gcc/cfgexpand.c:3673
0x703131 expand_gimple_stmt
/home/mjambor/gcc/small/src/gcc/cfgexpand.c:3734
0x7059f3 expand_gimple_basic_block
/home/mjambor/gcc/small/src/gcc/cfgexpand.c:5770
0x708e57 execute
/home/mjambor/gcc/small/src/gcc/cfgexpand.c:6373
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-612726-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 11:39:58 2018
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From: "dave.anglin at bell dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/86846] [9 Regression] ld: (Warning) Unsatisfied symbol "__atomic_exchange_8" in libstdc++.sl
Date: Tue, 14 Aug 2018 11:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86846
--- Comment #8 from dave.anglin at bell dot net ---
On 2018-08-11 8:04 PM, redi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86846
>
> --- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
> This should do it:
The testsuite isn't quite finished but it's clear this fixes the bug on
hppa64-hp-hpux11.11.
Don't know about second patch.
>
> --- a/libstdc++-v3/src/c++17/memory_resource.cc
> +++ b/libstdc++-v3/src/c++17/memory_resource.cc
> @@ -25,6 +25,7 @@
> #include <memory_resource>
> #include <atomic>
> #include <new>
> +#include <bits/std_mutex.h>
>
> namespace std _GLIBCXX_VISIBILITY(default)
> {
> @@ -81,7 +82,31 @@ namespace pmr
>
> constant_init<newdel_res_t> newdel_res{};
> constant_init<null_res_t> null_res{};
> +#if ATOMIC_POINTER_LOCK_FREE == 2
> constant_init<atomic<memory_resource*>> default_res{&newdel_res.obj};
> +#else
> + struct locking_atomic
> + {
> + constexpr locking_atomic(memory_resource* r) : val(r) { }
> + mutex mx;
> + memory_resource* val;
> +
> + memory_resource* load()
> + {
> + lock_guard<mutex> lock(mx);
> + return val;
> + }
> +
> + memory_resource* exchange(memory_resource* r)
> + {
> + lock_guard<mutex> lock(mx);
> + auto prev = val;
> + val = r;
> + return prev;
> + }
> + };
> + constant_init<locking_atomic> default_res{&newdel_res.obj};
> +#endif
> } // namespace
>
> memory_resource*
>
Thanks,
Dave
>From gcc-bugs-return-612727-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 11:44:02 2018
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Subject: [Bug libstdc++/86846] [9 Regression] ld: (Warning) Unsatisfied symbol "__atomic_exchange_8" in libstdc++.sl
Date: Tue, 14 Aug 2018 11:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86846
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
OK, thanks. The second patch might not be needed for hppa64-hp-hpux11.11 but
would be for targets without pointer-width atomics and without
PTHREAD_MUTEX_INITIALIZER, so I'll commit that version.
>From gcc-bugs-return-612728-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 12:02:27 2018
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Subject: [Bug c++/86949] New: gcc generate an error because delete operator is private when it isn't needed
Date: Tue, 14 Aug 2018 12:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86949
Bug ID: 86949
Summary: gcc generate an error because delete operator is
private when it isn't needed
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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in this code:
#include <new>
struct X {
X() noexcept { }
private:
static void operator delete(void*);
};
int main() {
X* x = new(std::nothrow) X{};
}
the delete operator is private but it isn't needed because the contructor and
the allocator can't throw. but gcc generate an error complaining that the
delete operator is private.
all other majors complier complie this code without errors except gcc:
https://godbolt.org/#z:OYLghAFBqd5QCxAYwPYBMCmBRdBLAF1QCcAaPECAKxAEZSAbAQwDtRkBSAJgCFufSAZ1QBXYskwgA5NwDMeFsgYisAag6yAwi0wB3Ddg4AGAILGTggsRHICqgBrqA7H1Or3DiAEpVLVJgAPCQAHOw4XZwARcw9VYOI8ADcmAkkYj0sUvGRVRNQ8dFVUYMxiFJJVLAZMVIg8goAqLw1XMydo2VbzBTsAWyYFb2cedTcPewbVAPVZSN89CEt0EBA/AgRiVF0fe3C%2BdpbRtsipL0ZpAFYpUhZpI2vUaU1%2BflVhMQl1Lllaa4I705nADWIFkXAAdAA2IwXGGyIwADgRABYuABOIzI85SZHXW5Se6kR5Sa6CEBGUj/AmnUhwWAwRAoVC9YJ4apkCgQNAstmlEDABFcUgAMzZqWIZIgACMAaQpQomMQAJ7SX6kbm9TAsAgAeRYDBV1NIWH6bGqsvwxEwtiSmDJRsC1pEqVV1x6mAYsqseF6rrOzDYKBevEYeClZMgZ2KBDwqBY9tJonEklo/sueNlxICCMhAFpIcjVMBkDkEeCuKoILhCBU5PRVJpmaz2V8fj5nrx%2BH8AV5gSAuLRwcjUZDZE40VxkU5ZBdaLRZNjcaRfci0eCnJCMRcfrQnE5BWj6PjCcTSeTKT3aQyIEhuc3SuRKHfecQUAxaGiAPoFkVi0qSmUjXlFhFUNNUNS1XV9UNQkTVYYBzSNS1rRjRI7VlR1kGdSQpDVd1PSNb1fVwmkA3YYMBAYMMI28IlQljeNpETD4UzTKQrhuTNpGzPMC1UABZABlAA1TRVA/VQuCMXdVAAJQAFQAdUrasiGIVt60bHkWzkLh2wo7tqV7UgEEwJgsFfWiCKXX1YXLeE0WRSEkS4AcnCPLiSSEc8qXuYyQVkWR12%2BSELgLWgkWRGcnAubFZAzI1TwvIyr3gOlGWfdlHy5JsXxAbJkAi38GHFADZWA0DXXVZlNW1PUDQtTBTQQnDYLwK0bTQ%2B1CUw7Cqvwr0EmI35/XgoNOxDKjw3gKN6LjBMhCTCQ6DYjjjwebic3zQsCvEssjHBIwVPwNSNNIBtcp075ZH0iaeEMvy%2B0C9c0QuWdBSMJwuAPehrOuFc10ii4uFCi4kUPJzOMSpjvIpXyaXSm8mW0h9OUyvklHg6EKVFEr/0oQDCQq5UqoguroMa5rELajrUPQh0AidF0SPIbUPUGn0/UYMbODu0NpsjOiY3mmH3mTFbsTWzyeO21RMbYVRIUOw7jprdS63OrT73V75kVuvheAewETLMizKDYmyQDsucLinWRhznRFtyxdaiVFnyeyeoLIXc9FMQnL7p0hSE4oSk8Yfh4yCK4MONq8yOzjQiUGJAZEgA%3D%3D
note that in this code:
#include <new>
struct X {
X() noexcept { }
static void operator delete(void*) = delete;
};
int main() {
X* x = new(std::nothrow) X{};
}
where the operator delete isn't needed and explicitly deleted gcc compiles
correctly.
>From gcc-bugs-return-612729-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 12:06:00 2018
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Subject: [Bug c++/86949] gcc generate an error because delete operator is private when it isn't needed
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-14
Ever confirmed|0 |1
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Subject: [Bug libstdc++/85343] Overload __throw_ios_failure to allow passing errno
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85343
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Tue Aug 14 12:09:57 2018
New Revision: 263535
URL: https://gcc.gnu.org/viewcvs?rev=263535&root=gcc&view=rev
Log:
PR libstdc++/85343 overload __throw_ios_failure to take errno
[ios::failure] p2: "When throwing ios_base::failure exceptions,
implementations should provide values of ec that identify the specific
reason for the failure."
This adds a new overload of __throw_ios_failure that can be passed
errno, to store error_code(errno, system_category()) in the exception
object.
PR libstdc++/85343
* acinclude.m4 (libtool_VERSION): Bump version.
* config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Add new symbol version.
Export new symbol.
* configure: Regenerate.
* doc/xml/manual/abi.xml: Document new versions.
* include/bits/fstream.tcc (basic_filebuf<C, T>::underflow)
(basic_filebuf<C, T>::xsgetn): Pass errno to __throw_ios_failure.
* include/bits/functexcept.h (__throw_ios_failure(const char*, int)):
Declare new overload.
* src/c++11/cxx11-ios_failure.cc (__ios_failure): Add new constructor
and static member function.
(__throw_ios_failure(const char*, int)): Define.
* src/c++98/ios_failure.cc [!_GLIBCXX_USE_DUAL_ABI]
(__throw_ios_failure(const char*, int)): Define.
* testsuite/util/testsuite_abi.cc: Update known and latest versions.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/config/abi/pre/gnu.ver
trunk/libstdc++-v3/doc/xml/manual/abi.xml
trunk/libstdc++-v3/include/bits/fstream.tcc
trunk/libstdc++-v3/include/bits/functexcept.h
trunk/libstdc++-v3/src/c++11/cxx11-ios_failure.cc
trunk/libstdc++-v3/src/c++98/ios_failure.cc
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Subject: [Bug libstdc++/85343] Overload __throw_ios_failure to allow passing errno
Date: Tue, 14 Aug 2018 12:11:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on trunk.
>From gcc-bugs-return-612732-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 12:56:03 2018
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Subject: [Bug hsa/86948] Internal compiler error compiling brig.dg/test/gimple/mulhi.hsail
Date: Tue, 14 Aug 2018 12:56:00 -0000
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Martin Jambor <jamborm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
--- Comment #1 from Martin Jambor <jamborm at gcc dot gnu.org> ---
The first bad revision is r263467:
38bbb539599302461fa06df5ea847e2ddd337409 is the first bad commit
commit 38bbb539599302461fa06df5ea847e2ddd337409
Author: amonakov <amonakov@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri Aug 10 10:13:37 2018 +0000
i386: do not use SImode mul-highpart on 64-bit (PR 82418)
PR target/82418
* config/i386/i386.md (<s>mul<mode>3_highpart): Use DWIH mode
iterator
instead of SWI48.
testsuite/
* gcc.target/i386/pr82418.c: New test.
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Subject: [Bug c++/86946] ice: canonical types differ for identical types
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Last reconfirmed| |2018-08-14
CC| |mpolacek at gcc dot gnu.org
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed. Must be very old.
>From gcc-bugs-return-612734-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 13:14:14 2018
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Subject: [Bug libstdc++/86846] [9 Regression] ld: (Warning) Unsatisfied symbol "__atomic_exchange_8" in libstdc++.sl
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--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Tue Aug 14 13:13:37 2018
New Revision: 263536
URL: https://gcc.gnu.org/viewcvs?rev=263536&root=gcc&view=rev
Log:
PR libstdc++/86846 Alternative to pointer-width atomics
Define a class using std::mutex for when std::atomic<memory_resource*>
cannot be used to implement the default memory resource.
When std::mutex constructor is not constexpr the constant_init trick
won't work, so just define a global and use init_priority for it. The
compiler warns about using reserved priority, so put the definition in a
header file using #pragma GCC system_header to suppress the warning.
PR libstdc++/86846
* src/c++17/default_resource.h: New file, defining default_res.
* src/c++17/memory_resource.cc [ATOMIC_POINTER_LOCK_FREE != 2]
(atomic_mem_res): Define alternative for atomic<memory_resource*>
using a mutex instead of atomics.
Added:
trunk/libstdc++-v3/src/c++17/default_resource.h
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/src/c++17/memory_resource.cc
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Subject: [Bug libstdc++/86846] [9 Regression] ld: (Warning) Unsatisfied symbol "__atomic_exchange_8" in libstdc++.sl
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Should be fixed now.
>From gcc-bugs-return-612736-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 13:18:56 2018
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Subject: =?UTF-8?B?W0J1ZyBjKysvODY5NTBdIE5ldzogaW50ZXJuYWwgY29tcGlsZXIgZXJyb3I6?= =?UTF-8?B?IHVuZXhwZWN0ZWQgZXhwcmVzc2lvbiDigJh2b2lkKCnigJkgb2Yga2luZCBj?= =?UTF-8?B?YXN0X2V4cHI=?Date: Tue, 14 Aug 2018 13:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86950
Bug ID: 86950
Summary: internal compiler error: unexpected expression
‘void()’ of kind cast_expr
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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Reporter: mpolacek at gcc dot gnu.org
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template <typename T>
auto f(T) -> decltype(void(), 1) { }
int
main ()
{
f(0);
}
0x8d1e01 cxx_eval_constant_expression
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4861
0x8cf490 cxx_eval_constant_expression
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4485
0x8d451e cxx_eval_outermost_constant_expr
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4970
0x8d7368 maybe_constant_value(tree_node*, tree_node*)
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:5197
0xa6b7b9 check_narrowing(tree_node*, tree_node*, int, bool)
/home/mpolacek/src/gcc/gcc/cp/typeck2.c:909
0xa2b0c2 finish_decltype_type(tree_node*, bool, int)
/home/mpolacek/src/gcc/gcc/cp/semantics.c:8917
0x9ab936 cp_parser_decltype
/home/mpolacek/src/gcc/gcc/cp/parser.c:14296
0x9adcdf cp_parser_simple_type_specifier
/home/mpolacek/src/gcc/gcc/cp/parser.c:17197
0x9a7d95 cp_parser_type_specifier
/home/mpolacek/src/gcc/gcc/cp/parser.c:16982
0x9a8b62 cp_parser_type_specifier_seq
/home/mpolacek/src/gcc/gcc/cp/parser.c:21253
0x9a8d81 cp_parser_type_id_1
/home/mpolacek/src/gcc/gcc/cp/parser.c:21099
0x9a4977 cp_parser_trailing_type_id
/home/mpolacek/src/gcc/gcc/cp/parser.c:21192
0x9a4977 cp_parser_late_return_type_opt
/home/mpolacek/src/gcc/gcc/cp/parser.c:21017
0x9a4977 cp_parser_direct_declarator
/home/mpolacek/src/gcc/gcc/cp/parser.c:20189
0x9a4977 cp_parser_declarator
/home/mpolacek/src/gcc/gcc/cp/parser.c:20019
0x9b2891 cp_parser_init_declarator
/home/mpolacek/src/gcc/gcc/cp/parser.c:19535
0x9b960a cp_parser_single_declaration
/home/mpolacek/src/gcc/gcc/cp/parser.c:27432
0x9b974c cp_parser_template_declaration_after_parameters
/home/mpolacek/src/gcc/gcc/cp/parser.c:27034
0x9b9fee cp_parser_explicit_template_declaration
/home/mpolacek/src/gcc/gcc/cp/parser.c:27271
0x9b9fee cp_parser_template_declaration_after_export
/home/mpolacek/src/gcc/gcc/cp/parser.c:27290
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
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----------------------------------------------------------------------------
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed testcase:
template <typename T>
auto f(T) -> decltype(void(), 1) { return 1; }
int
main ()
{
f(0);
}
>From gcc-bugs-return-612739-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 13:25:04 2018
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Subject: [Bug hsa/86948] Internal compiler error compiling brig.dg/test/gimple/mulhi.hsail
Date: Tue, 14 Aug 2018 13:25:00 -0000
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--- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Thanks for the heads-up. At present, BRIG frontend cannot rely on
MULT_HIGHPART, as the pattern is optional and, as this bug shows, generic
expansion is not implemented. BRIG frontend is already somewhat aware of the
issue, as the comment in brig-basic-inst-handler.cc indicates:
554 /* MULT_HIGHPART_EXPR works only on target dependent vector sizes and
555 even the scalars do not seem to work at least for char elements.
556
557 Let's fall back to scalarization and promotion [...]
So a quick-fix would be to never try to use MULT_HIGHPART_EXPR from BRIG FE.
However, I think it would be nice to extend expand_mult_highpart to handle
this, at least to avoid regressing here. I'll look into that. I'll also try to
expose MULT_HIGHPART_EXPR via the GIMPLE FE so it can be tested in a more
straightforward manner.
>From gcc-bugs-return-612740-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 13:31:18 2018
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Closing because I am an idiot.
>From gcc-bugs-return-612741-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 13:44:49 2018
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Subject: [Bug c++/86623] constexpr evaluation fails to give an error for modifying a const object
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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>From gcc-bugs-return-612742-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 13:57:31 2018
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Subject: [Bug libstdc++/79323] FAIL: 20_util/duration/literals/range.cc (test for excess errors)
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
.
>From gcc-bugs-return-612743-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 13:59:52 2018
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Subject: [Bug libstdc++/79433] __has_include(<new header>) is true but #include <new header> gives #error when -std=old
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #28 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is fixed for gcc 7.3 and I don't plan to backport it to gcc-6-branch.
>From gcc-bugs-return-612744-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 14:16:36 2018
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Subject: [Bug target/86599] Problems building libgfortran from 7.2.0 on HP-UX 11.31/PA
Date: Tue, 14 Aug 2018 14:16:00 -0000
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--- Comment #20 from The Written Word <bugzilla-gcc at thewrittenword dot com> ---
Created attachment 44536
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44536&action=edit
stdlib.h long_double patch for HP-UX 11.31/PA
Tested against 7.3.0 and 8.2.0.
>From gcc-bugs-return-612745-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 14:18:05 2018
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Subject: [Bug target/84908] retpoline weirdness: 7.3.0-1 and 4.8.5-16: with -fPIC: R_X86_64_PC32 against undefined symbol `__x86_indirect_thunk_rax'
Date: Tue, 14 Aug 2018 14:18:00 -0000
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Andy Lutomirski <luto at kernel dot org> changed:
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--- Comment #9 from Andy Lutomirski <luto at kernel dot org> ---
I haven't fully dug into this, but I do one one immediate question: why is GCC
generating a jump table for a five-entry switch statement if retpolines are on?
This has got to be a *huge* performance loss. The retpoline sequence is very,
very slow, and branches aren't that slow. A five-entry switch is only three
branches deep.
>From gcc-bugs-return-612746-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 14:20:54 2018
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Subject: [Bug target/86951] New: arm speculation barrier incompatible with ARMv6 or earlier
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Bug ID: 86951
Summary: arm speculation barrier incompatible with ARMv6 or
earlier
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: assemble-failure
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: rearnsha at gcc dot gnu.org
Blocks: 86772
Target Milestone: ---
Target: arm
The speculation_barrier_insn pattern uses DSB and ISB, but these instructions
were only added in ARMv7. Another approach is needed for older versions of the
architecture.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86772
[Bug 86772] [meta-bug] tracking port status for CVE-2017-5753
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Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-14
Ever confirmed|0 |1
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Subject: [Bug libstdc++/86590] Codegen is poor when passing std::string by value with _GLIBCXX_EXTERN_TEMPLATE undefined
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-612749-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 14:37:53 2018
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Subject: [Bug hsa/86948] Internal compiler error compiling brig.dg/test/gimple/mulhi.hsail
Date: Tue, 14 Aug 2018 14:37:00 -0000
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--- Comment #3 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Created attachment 44537
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44537&action=edit
expose mult-highpart via GIMPLE FE
Attaching a patch that allows creating MULT_HIGHPART_EXPR via GIMPLE FE, which
allows testing with
__GIMPLE
unsigned f(unsigned x, unsigned y)
{
unsigned r;
r = x h* y;
return r;
}
(though the patch is not too sophisticated, it accepts "h<whitespace>*")
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Subject: [Bug tree-optimization/86724] Compilation error with new isl 0.20 (missing includes)
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--- Comment #8 from Matthias Klose <doko at gcc dot gnu.org> ---
Author: doko
Date: Tue Aug 14 15:15:39 2018
New Revision: 263539
URL: https://gcc.gnu.org/viewcvs?rev=263539&root=gcc&view=rev
Log:
2018-08-14 Matthias Klose <doko@ubuntu.com>
Backport from mainline
2018-08-01 Richard Biener <rguenther@suse.de>
PR bootstrap/86724
* graphite.h: Include isl/id.h and isl/space.h to allow build
with ISL 0.20.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/graphite.h
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Subject: [Bug target/86952] New: Avoid jump table for switch statement with -mindirect-branch=thunk
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Bug ID: 86952
Summary: Avoid jump table for switch statement with
-mindirect-branch=thunk
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
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CC: wei3.xiao at intel dot com
Blocks: 84072
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Target: i386,x86-64
Why is GCC generating a jump table for a five-entry switch statement if
retpolines are on? This has got to be a *huge* performance loss. The
retpoline sequence is very, very slow, and branches aren't that slow.
A five-entry switch is only three branches deep.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84072
[Bug 84072] [meta-bug] -mindirect-branch=thunk issues
>From gcc-bugs-return-612752-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 15:25:32 2018
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Subject: [Bug target/84908] retpoline weirdness: 7.3.0-1 and 4.8.5-16: with -fPIC: R_X86_64_PC32 against undefined symbol `__x86_indirect_thunk_rax'
Date: Tue, 14 Aug 2018 15:25:00 -0000
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--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Andy Lutomirski from comment #9)
> I haven't fully dug into this, but I do one one immediate question: why is
> GCC generating a jump table for a five-entry switch statement if retpolines
> are on? This has got to be a *huge* performance loss. The retpoline
> sequence is very, very slow, and branches aren't that slow. A five-entry
> switch is only three branches deep.
I opened:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86952
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From: "jason.vas.dias at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84908] retpoline weirdness: 7.3.0-1 and 4.8.5-16: with -fPIC: R_X86_64_PC32 against undefined symbol `__x86_indirect_thunk_rax'
Date: Tue, 14 Aug 2018 15:29:00 -0000
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--- Comment #11 from Jason Vas Dias <jason.vas.dias at gmail dot com> ---
In reply to Comment #9 :
Thanks Andy -
I think it is because when the retpoline flags are enabled ,
the 'static inline' function calls in vclock_gettime.c
have default function attributes which differ from those that
__vdso_clock_gettime
( the function containing the switch ) gets,
so GCC finds it must instantiate a
callable version of the normally static inline function calls
this function makes, and
generates relocations for them which are not getting
copied into the VDSO for some reason.
Rather than making more radical changes to the VDSO assembly
code to handle these types of relocations, I think it is better
to avoid them being generated by either:
A) compiling vclock_gettime.c without
'-mindirect-branch=thunk-extern -mindirect-branch-register -DRETPOLINE'
(rejected by Andi Kleen)
B) Specifying ALL entry points that __vdso_clock_gettime calls
to have attributes that do not require relocation for GCC
to handle if the above flags are in effect:
#ifdef RETPOLINE
+# define _NO_THUNK_RELOCS_()(indirect_branch("keep"),\
+ function_return("keep"))
+# define _RETPOLINE_FUNC_ATTR_ __attribute__(_NO_THUNK_RELOCS_())
+# define _RETPOLINE_INLINE_ inline
+#else
+# define _RETPOLINE_FUNC_ATTR_
+# define _RETPOLINE_INLINE_ __always_inline
+#endif
So then one declares any function called by __vdso_clock_gettime() like:
notrace static _RETPOLINE_FUNC_ATTR_ _RETPOLINE_INLINE_
int do_monotonic_raw( int clock, struct timespec *ts ) { ... }
and then must declare
notrace int _RETPOLINE_FUNC_ATTR_
__vdso_clock_gettime(clockid_t clock, struct timespec *ts)
{... do_monotonic_raw(ts); ...}
to avoid the relocations being generated.
I did submit a patch to vclock_gettime.c
to do this - should I re-submit it?
Or one could fix the code which produces the resulting vdso
to include the generated (unecessary and redundant) relocations,
or generate the relocation functions in assembler somehow, but
I don't think this is the way the VDSO should go. There is no
reason to make functions in the VDSO have function attributes
indirect_branch("thunk-extern,register") - they always WILL
generate relocations if more that 5 such calls are made in same
switch, with all current versions of GCC, it seems.
Every function that directly invokes these functions (in glibc),
must also have these function attributes, which are entirely
unnecessary and inefficient compared to the indirect_branch("keep")
style; and those relocations then must be in the VDSO for callers
to invoke.
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Subject: [Bug c++/86678] constexpr evaluation incorrectly diagnoses unevaluated call to non-constexpr function
Date: Tue, 14 Aug 2018 16:09:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2018-07-26 00:00:00 |2018-8-14
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
constexpr bool always_true() { return true; }
int f() { return 1; }
constexpr int g() {
if (always_true())
return 0;
return f();
}
ce.cc: In function 'constexpr int g()':
ce.cc:6:11: error: call to non-'constexpr' function 'int f()'
6 | return f();
| ~^~
This makes it awkward to use the new __builtin_is_constant_evaluated().
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Subject: [Bug c++/86953] New: compiler crashes with constexpr operator== and specific struct (cxx_eval_bit_field_ref, at cp/constexpr.c:2704)
Date: Tue, 14 Aug 2018 16:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86953
Bug ID: 86953
Summary: compiler crashes with constexpr operator== and
specific struct (cxx_eval_bit_field_ref, at
cp/constexpr.c:2704)
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: remi.ducceschi at gmail dot com
Target Milestone: ---
Created attachment 44538
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44538&action=edit
preprocessed file of a small test case for the constexpr crash
Hello,
I've created a small test case that produces a compiler crash. You can find
attached the preprocessed file (main.ii) made by running the following command,
with `G++ 7.3.1 20180303 (Red Hat 7.3.1-5)` on a CentOS 7 (with the
devtoolset-7 installed), but it seems to exist on the last version too (see
https://wandbox.org/permlink/zGZWdHIrRNJKfh5Z):
g++ -O3 -Wall -Wextra -o main -save-temps -v main.cpp
I give at the end of the mail the output of the command.
You can find a run on the last G++ version (9) here:
https://wandbox.org/permlink/zGZWdHIrRNJKfh5Z
-----------------------
Here is the code:
#include <iostream>
struct Bugged {
double x; bool isfreex; bool isfreey;
constexpr bool operator==(const Bugged& other) const noexcept {
return (x == other.x) && (isfreex == other.isfreex) && (isfreey ==
other.isfreey);
}
};
int main () {
std::cout << std::boolalpha << (Bugged{} == Bugged{}) << std::endl;
return 0;
}
-----------------------
The bug only appears if I enable optimization (-02 or -O3), I guess constexpr
optimization is not done otherwise.
The problem occurs on the operator==(). The compiler crashes because it can't
compute the result of the constexpr. Note that if I change the struct so it
doesn't hold booleans, but double instead, or if I remove any of the
parentheses term in the operator== function, it doesn't crash.
Note that this code compiles on MSVC 2017 and on clang 6 (though it doesn't
mean anything).
I search for a similar bug report but didn't find anything, sorry if this is a
duplicate.
-----------------------
Below the output of the command:
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/opt/rh/devtoolset-7/root/usr/libexec/gcc/x86_64-redhat-linux/7/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap
--enable-languages=c,c++,fortran,lto --prefix=/opt/rh/devtoolset-7/root/usr
--mandir=/opt/rh/devtoolset-7/root/usr/share/man
--infodir=/opt/rh/devtoolset-7/root/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared
--enable-threads=posix --enable-checking=release --enable-multilib
--with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions
--enable-gnu-unique-object --enable-linker-build-id
--with-gcc-major-version-only --enable-plugin --with-linker-hash-style=gnu
--enable-initfini-array --with-default-libstdcxx-abi=gcc4-compatible
--with-isl=/builddir/build/BUILD/gcc-7.3.1-20180303/obj-x86_64-redhat-linux/isl-install
--enable-libmpx --enable-gnu-indirect-function --with-tune=generic
--with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 7.3.1 20180303 (Red Hat 7.3.1-5) (GCC)
COLLECT_GCC_OPTIONS='-O3' '-Wall' '-Wextra' '-o' 'main' '-save-temps' '-v'
'-shared-libgcc' '-mtune=generic' '-march=x86-64'
/opt/rh/devtoolset-7/root/usr/libexec/gcc/x86_64-redhat-linux/7/cc1plus -E
-quiet -v -D_GNU_SOURCE main.cpp -mtune=generic -march=x86-64 -Wall -Wextra -O3
-fpch-preprocess -o main.ii
ignoring nonexistent directory
"/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/include-fixed"
ignoring nonexistent directory
"/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/../../../../x86_64-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7
/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7/x86_64-redhat-linux
/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7/backward
/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/include
/usr/local/include
/opt/rh/devtoolset-7/root/usr/include
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-O3' '-Wall' '-Wextra' '-o' 'main' '-save-temps' '-v'
'-shared-libgcc' '-mtune=generic' '-march=x86-64'
/opt/rh/devtoolset-7/root/usr/libexec/gcc/x86_64-redhat-linux/7/cc1plus
-fpreprocessed main.ii -quiet -dumpbase main.cpp -mtune=generic -march=x86-64
-auxbase main -O3 -Wall -Wextra -version -o main.s
GNU C++14 (GCC) version 7.3.1 20180303 (Red Hat 7.3.1-5) (x86_64-redhat-linux)
compiled by GNU C version 7.3.1 20180303 (Red Hat 7.3.1-5), GMP version
6.0.0, MPFR version 3.1.1, MPC version 1.0.1, isl version isl-0.16.1-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++14 (GCC) version 7.3.1 20180303 (Red Hat 7.3.1-5) (x86_64-redhat-linux)
compiled by GNU C version 7.3.1 20180303 (Red Hat 7.3.1-5), GMP version
6.0.0, MPFR version 3.1.1, MPC version 1.0.1, isl version isl-0.16.1-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: d120f4d100e8519a845aa191e71919b8
main.cpp: In function ‘int main()’:
main.cpp:23:43: in constexpr expansion of
‘Bugged{}.Bugged::operator==(Bugged{})’
main.cpp:23:54: internal compiler error: in cxx_eval_bit_field_ref, at
cp/constexpr.c:2565
std::cout << std::boolalpha << (Bugged{} == Bugged{}) << std::endl;
^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugzilla.redhat.com/bugzilla> for instructions.
Preprocessed source stored into /tmp/ccVplEXc.out file, please attach this to
your bugreport.
>From gcc-bugs-return-612756-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 16:38:27 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86953] compiler crashes with constexpr operator== and specific struct (cxx_eval_bit_field_ref, at cp/constexpr.c:2704)
Date: Tue, 14 Aug 2018 16:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86953
--- Comment #1 from Rémi DUCCESCHI <remi.ducceschi at gmail dot com> ---
Created attachment 44539
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44539&action=edit
Small test case
>From gcc-bugs-return-612757-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 16:46:56 2018
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86953] [6/7/8/9 Regression] compiler crashes with constexpr operator== and specific struct (cxx_eval_bit_field_ref, at cp/constexpr.c:2704)
Date: Tue, 14 Aug 2018 16:46:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-14
CC| |mpolacek at gcc dot gnu.org
Summary|compiler crashes with |[6/7/8/9 Regression]
|constexpr operator== and |compiler crashes with
|specific struct |constexpr operator== and
|(cxx_eval_bit_field_ref, at |specific struct
|cp/constexpr.c:2704) |(cxx_eval_bit_field_ref, at
| |cp/constexpr.c:2704)
Ever confirmed|0 |1
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed. G++ 5 compiles it fine.
>From gcc-bugs-return-612758-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 16:49:20 2018
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From: "frankhb1989 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/86954] New: redundant nothrow in call of ::operator delete
Date: Tue, 14 Aug 2018 16:49:00 -0000
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Bug ID: 86954
Summary: redundant nothrow in call of ::operator delete
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
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In the current implementation std::return_temporary_buffer, ::operator delete
is called with std::nothrow as 2nd argument. (It seems here is the only
occurrence of such ::operator delete call in libstdc++). This seems
unintentional. Normally the std::nothrow argument should not exist here.
This should make no difference to intentional behavior when the allocation and
deallocation functions are not replaced due to the default behavior. However,
since the nothrow_t overloads are called by implementation on exceptions during
the call of operator new, and the overloads can be replaceable as per
[new.delete.single], this may lead to surprise result with reasonable use, e.g.
when user expect to have different log messages in different replaced overloads
of ::operator delete.
>From gcc-bugs-return-612759-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 16:51:16 2018
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Subject: [Bug libstdc++/86590] Codegen is poor when passing std::string by value with _GLIBCXX_EXTERN_TEMPLATE undefined
Date: Tue, 14 Aug 2018 16:51:00 -0000
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--- Comment #28 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 44540
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44540&action=edit
Use __builtin_is_constant_evaluated()
I tried to replace the __builtin_constant_p and __constant_string conditions
with Jakub's new __builtin_is_constant_evaluated (see patch) but it made no
difference.
>From gcc-bugs-return-612760-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 16:53:12 2018
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Subject: [Bug libstdc++/86590] Codegen is poor when passing std::string by value with _GLIBCXX_EXTERN_TEMPLATE undefined
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--- Comment #29 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The seemingly-redundant 'else' keywords in the patch are needed because of PR
86678.
>From gcc-bugs-return-612761-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 17:25:11 2018
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Subject: [Bug hsa/86948] Internal compiler error compiling brig.dg/test/gimple/mulhi.hsail
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--- Comment #4 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Created attachment 44541
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44541&action=edit
generic expansion for mult-highpart
This patch implements fallback via widening multiply; works for the gimple
testcase.
If this is accepted, BRIG FE should be able to drop workarounds and always use
MULT_HIGHPART_EXPR when it needs to; if not, BRIG FE should be changed to
assume that MULT_HIGHPART_EXPR is never available.
>From gcc-bugs-return-612762-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 17:31:25 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/86955] New: strlen of a known string in member array plus offset not folded
Date: Tue, 14 Aug 2018 17:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86955
Bug ID: 86955
Summary: strlen of a known string in member array plus offset
not folded
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
GCC is able to fold three out of the four strlen calls in the test case below,
even though folding all four should be possible.
$ cat f.c && gcc -O2 -S -Wall -Wextra -fdump-tree-optimized=/dev/stdout f.c
char a[8];
struct A { char i, a[8]; };
void f0 (void)
{
__builtin_strcpy (a, "123");
if (__builtin_strlen (a) != 3) // folded
__builtin_abort ();
}
void f1 (void)
{
__builtin_strcpy (a, "123");
if (__builtin_strlen (a + 1) != 2) // folded
__builtin_abort ();
}
void f2 (struct A* p)
{
__builtin_strcpy (p->a, "123");
if (__builtin_strlen (p->a) != 3) // folded
__builtin_abort ();
}
void f3 (struct A* p)
{
__builtin_strcpy (p->a, "123");
if (__builtin_strlen (p->a + 1) != 2) // not folded
__builtin_abort ();
}
;; Function f0 (f0, funcdef_no=0, decl_uid=1910, cgraph_uid=1, symbol_order=1)
f0 ()
{
<bb 2> [local count: 1073741825]:
__builtin_memcpy (&a, "123", 4); [tail call]
return;
}
;; Function f1 (f1, funcdef_no=1, decl_uid=1913, cgraph_uid=2, symbol_order=2)
f1 ()
{
<bb 2> [local count: 1073741825]:
__builtin_memcpy (&a, "123", 4); [tail call]
return;
}
;; Function f2 (f2, funcdef_no=2, decl_uid=1916, cgraph_uid=3, symbol_order=3)
f2 (struct A * p)
{
char[8] * _1;
<bb 2> [local count: 1073741825]:
_1 = &p_3(D)->a;
__builtin_memcpy (_1, "123", 4); [tail call]
return;
}
;; Function f3 (f3, funcdef_no=3, decl_uid=1919, cgraph_uid=4, symbol_order=4)
f3 (struct A * p)
{
char[8] * _1;
const char * _2;
long unsigned int _3;
<bb 2> [local count: 1073741825]:
_1 = &p_4(D)->a;
__builtin_memcpy (_1, "123", 4);
_2 = &MEM[(void *)p_4(D) + 2B];
_3 = __builtin_strlen (_2);
if (_3 != 2)
goto <bb 3>; [0.00%]
else
goto <bb 4>; [99.96%]
<bb 3> [count: 0]:
__builtin_abort ();
<bb 4> [local count: 1073312327]:
return;
}
>From gcc-bugs-return-612763-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 17:33:44 2018
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Subject: [Bug tree-optimization/86955] strlen of a known string in member array plus offset not folded
Date: Tue, 14 Aug 2018 17:33:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Blocks| |83819
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
The reason is that the strlen pass sees the following:
_1 = &p_4(D)->a;
__builtin_memcpy (_1, "123", 4);
_2 = &MEM[(void *)p_4(D) + 2B];
_3 = __builtin_strlen (_2);
and it doesn't understand that &MEM[(void *)p_4(D) + 2B] actually refers to
p_4(D)->a.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83819
[Bug 83819] [meta-bug] missing strlen optimizations
>From gcc-bugs-return-612764-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 17:39:17 2018
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Subject: [Bug target/86731] [8/9 Regression] Miscompiles vec_sl at -O3 with -fwrapv on ppc64el
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Will Schmidt <willschm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-14
Assignee|unassigned at gcc dot gnu.org |willschm at gcc dot gnu.org
Ever confirmed|0 |1
>From gcc-bugs-return-612765-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 17:42:08 2018
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Subject: [Bug c++/86953] [6/7/8/9 Regression] compiler crashes with constexpr operator== and specific struct (cxx_eval_bit_field_ref, at cp/constexpr.c:2704)
Date: Tue, 14 Aug 2018 17:42:00 -0000
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
struct B {
double x;
bool isfreex;
bool isfreey;
constexpr bool operator==(const B& other) const noexcept
{
return (x == other.x) && (isfreex == other.isfreex) && (isfreey ==
other.isfreey);
}
constexpr bool operator!=(const B& other) const noexcept { return !(*this ==
other); }
};
int
main ()
{
bool b = B{} == B{};
}
>From gcc-bugs-return-612766-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 17:46:18 2018
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Subject: [Bug c++/86953] [6/7/8/9 Regression] compiler crashes with constexpr operator== and specific struct (cxx_eval_bit_field_ref, at cp/constexpr.c:2704)
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r230365 -- Merge C++ delayed folding branch..
>From gcc-bugs-return-612767-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 18:17:55 2018
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Subject: [Bug c++/78244] Narrowing conversion is accepted in a function template, but it should be rejected
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Enhanced testcase (so that I don't lose it):
template <typename T>
auto f1(T) -> decltype(int{2.0}, void()) { }
template <typename T>
auto f2(T) -> decltype(int{2.0}) { return 1; }
template <typename T>
auto f3(T) -> decltype(void(), int{2.0}) { return 1; }
int
main ()
{
f1 (0);
f2 (0);
f3 (0);
}
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Subject: [Bug tree-optimization/86914] [8/9 Regression] -O2 generates wrong code with strlen() of pointers within one-element arrays of structures
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-08/msg00823.html
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Subject: [Bug c++/86956] New: Use of an alias template unexpectedly breaks compilation
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Bug ID: 86956
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/********************** BEGIN SOURCE **********************/
template<class>
struct Outer {
template<bool>
struct Inner;
template<bool x>
using Alias = Inner<x>;
};
template<>
template<bool v>
struct Outer<void>::Inner {
static constexpr bool value = v;
};
static_assert(Outer<void>::Inner<true>::value); // OK
static_assert(Outer<void>::Alias<true>::value); // error
/*********************** END SOURCE ***********************/
The first static_assert compiles OK, but the second results in unexpected
errors:
/********************** BEGIN OUTPUT **********************/
<source>: In instantiation of 'struct Outer<void>::Inner<true>':
<source>:17:39: required from here
<source>:12:27: error: type/value mismatch at argument 1 in template parameter
list for 'template<bool <anonymous> > struct Outer<void>::Inner<<enumerator> >'
12 | struct Outer<void>::Inner {
| ^
<source>:12:27: note: expected a constant of type 'bool', got 'void'
<source>:12:27: error: type/value mismatch at argument 1 in template parameter
list for 'Outer<void>::Inner<<enumerator> >::Inner'
<source>:12:27: note: expected a constant of type 'bool', got 'void'
<source>:13:27: error: type/value mismatch at argument 1 in template parameter
list for 'template<bool <anonymous> > struct Outer<void>::Inner<<enumerator> >'
13 | static constexpr bool value = v;
| ^~~~~
<source>:13:27: note: expected a constant of type 'bool', got 'void'
<source>:13:27: error: type/value mismatch at argument 1 in template parameter
list for 'value'
<source>:13:27: note: expected a constant of type 'bool', got 'void'
<source>:17:41: error: 'value' is not a member of 'Outer<void>::Alias<true>'
{aka 'Outer<void>::Inner<true>'}
17 | static_assert(Outer<void>::Alias<true>::value); // error
| ^~~~~
Compiler returned: 1
/*********************** END OUTPUT ***********************/
The part "expected a constant of type 'bool', got 'void'" looks inexplicable;
"Inner<<enumerator> >" is also difficult to decipher. The issue is discovered
with build 9.0.0 20180813 (experimental), but appears to exist in earlier
versions as well.
For comparison, Clang compiles this code successfully.
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From: "ibhagatgnu at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/86957] New: gcc should warn about missing profiles for a compilation unit or a new function with -fprofile-use
Date: Tue, 14 Aug 2018 19:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86957
Bug ID: 86957
Summary: gcc should warn about missing profiles for a
compilation unit or a new function with -fprofile-use
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
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CC: mliska at suse dot cz
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When using -fprofile-use in the FDO build, gcc currently does not warn about
about the following two cases.
Both the cases are related to a missing profiles.
Discussed here on mailing list https://gcc.gnu.org/ml/gcc/2018-08/msg00048.html
CASE 1 : Missing profile for a new function
-------------------------------------------
If a new function foo() is added to the file, gcc only warns about those
existing functions whose source locations have been impacted by foo() by
issuing the following :
"warning : source locations for function 'XXX' have changed, the profile data
may be out of date [-Werror=coverage-mismatch]"
Proposal to add a warning for the new function foo() along the lines of -
"warning : profile for function ‘XXX’ not found in profile data
[-Wmissing-profile]"
Note that, the corner case of foo() being added to the end of the file is
exclusively covered by the proposed -Wmissing-profile
CASE 2 : Missing profile for a compilation unit
-----------------------------------------------
This is the case when, e.g., a new source file is added to the project after
profile generation phase. Also, the case when somehow .gcda files are wiped out
in a make clean etc.
It is worth informing the user that profile generation is due. Proposal to add
a warning per file along the lines of -
"warning : profile count data file not found, regenerating profiles may help
[-Wmissing-profile]"
To contrast, -Wcoverage-mismatch covers the cases when profiles are STALE.
-Wmissing-profile is intended to cover the cases when there is NO profile.
I propose to keep the behaviour of -Wmissing-profile to be consistent with
-Wcoverage-mismatch in that :
1. Both should be on by default and treated as errors by default in
-fprofile-use FDO build
2. A user must use -Wno-error to just see them as warnings (with
-fprofile-use).
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Subject: [Bug fortran/86116] [6/7/8/9 Regression] Ambiguous generic interface not recognised
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--- Comment #4 from janus at gcc dot gnu.org ---
Author: janus
Date: Tue Aug 14 19:09:33 2018
New Revision: 263540
URL: https://gcc.gnu.org/viewcvs?rev=263540&root=gcc&view=rev
Log:
2018-08-14 Janus Weil <janus@gcc.gnu.org>
PR fortran/86116
* interface.c (compare_type): Remove a CLASS/TYPE check.
(compare_type_characteristics): New function that behaves like the old
'compare_type'.
(gfc_check_dummy_characteristics, gfc_check_result_characteristics):
Call 'compare_type_characteristics' instead of 'compare_type'.
2018-08-14 Janus Weil <janus@gcc.gnu.org>
PR fortran/86116
* gfortran.dg/generic_34.f90: New test case.
Added:
trunk/gcc/testsuite/gfortran.dg/generic_34.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/interface.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug tree-optimization/86650] -Warray-bounds missing inlining context
Date: Tue, 14 Aug 2018 19:11:00 -0000
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--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Tue Aug 14 19:11:20 2018
New Revision: 263541
URL: https://gcc.gnu.org/viewcvs?rev=263541&root=gcc&view=rev
Log:
PR tree-optimization/86650 - -Warray-bounds missing inlining context
gcc/ChangeLog:
PR tree-optimization/86650
* tree-vrp.c (vrp_prop::check_array_ref): Print an inform message.
(vrp_prop::check_mem_ref): Same.
gcc/testsuite/ChangeLog:
PR tree-optimization/86650
* gcc.dg/Warray-bounds-34.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/Warray-bounds-34.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vrp.c
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Subject: [Bug tree-optimization/86650] -Warray-bounds missing inlining context
Date: Tue, 14 Aug 2018 19:12:00 -0000
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--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Another small enhancement committed in r263541. The inlining context is not
yet included so leaving this open until it's done.
>From gcc-bugs-return-612774-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 19:16:02 2018
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Subject: [Bug c++/78244] Narrowing conversion is accepted in a function template, but it should be rejected
Date: Tue, 14 Aug 2018 19:15:00 -0000
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Another simple test:
template<typename>
decltype(int{1.1}) v;
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Subject: [Bug c++/78244] Narrowing conversion is accepted in a function template, but it should be rejected
Date: Tue, 14 Aug 2018 19:17:00 -0000
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--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
And with class templates:
template<typename>
struct S {
static const int i{1.1};
};
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Subject: [Bug c++/86958] New: ICE in finish_member_declaration when an alias template is used
Date: Tue, 14 Aug 2018 19:18:00 -0000
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Bug ID: 86958
Summary: ICE in finish_member_declaration when an alias
template is used
Product: gcc
Version: 9.0
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/********************** BEGIN SOURCE **********************/
template<class>
struct Outer {
template<bool>
struct Inner;
template<bool x>
using Alias = Inner<x>;
};
template<>
template<bool v>
struct Outer<void>::Inner {
static constexpr bool value = v;
};
static_assert(Outer<bool>::Inner<bool>::value == sizeof(bool)); // OK
static_assert(Outer<bool>::Alias<bool>::value == sizeof(bool); // error
/*********************** END SOURCE ***********************/
The first static_assert compiles OK, but the second results in an ICE:
/********************** BEGIN OUTPUT **********************/
<source>: In instantiation of 'struct Outer<bool>::Inner<bool>':
<source>:17:39: required from here
<source>:13:27: internal compiler error: in finish_member_declaration, at
cp/semantics.c:3085
13 | static constexpr auto value = sizeof(T);
| ^~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1
/*********************** END OUTPUT ***********************/
This issue was found with build 9.0.0 20180813 (experimental), but appears to
exist in earlier versions as well.
For comparison, Clang compiles this code successfully.
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Subject: [Bug c++/65043] Expected narrowing conversion during list initialization of bool from double
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Simplified:
struct X
{
X(bool) { }
};
int main()
{
X x{1.2};
}
>From gcc-bugs-return-612778-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 19:20:40 2018
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Subject: [Bug c++/86958] ICE in finish_member_declaration when an alias template is used
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--- Comment #1 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
Sorry, there is a missing closing parenthesis in my code. The last line should
look like this:
static_assert(Outer<bool>::Alias<bool>::value == sizeof(bool)); // error
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Subject: [Bug c++/86958] ICE in finish_member_declaration when an alias template is used
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I don't see the ICE:
$ ./cc1plus -quiet 86958.C
86958.C:16:38: error: type/value mismatch at argument 1 in template parameter
list for ‘template<class> template<bool <anonymous> > struct Outer<
<template-parameter-1-1> >::Inner’
16 | static_assert(Outer<bool>::Inner<bool>::value == sizeof(bool)); // OK
| ^
86958.C:16:38: note: expected a constant of type ‘bool’, got ‘bool’
86958.C:17:38: error: type/value mismatch at argument 1 in template parameter
list for ‘template<class> template<bool x> using Alias = Outer<
<template-parameter-1-1> >::Inner<x>’
17 | static_assert(Outer<bool>::Alias<bool>::value == sizeof(bool)); // error
| ^
86958.C:17:38: note: expected a constant of type ‘bool’, got ‘bool’
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Subject: [Bug c++/86958] ICE in finish_member_declaration when an alias template is used
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
note: expected a constant of type ‘bool’, got ‘bool’
Though this is clearly bogus.
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Subject: [Bug c++/86959] New: Use of a variadic alias template unexpectedly breaks compilation
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Bug ID: 86959
Summary: Use of a variadic alias template unexpectedly breaks
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/*********************** BEGIN SOURCE ***********************/
template<class>
struct Outer {
template<class...>
struct Inner;
template<class... T>
using Alias = Inner<T...>;
};
template<>
template<class... T>
struct Outer<void>::Inner {
static constexpr auto value = sizeof...(T);
};
static_assert(Outer<void>::Inner<void>::value == 1); // OK
static_assert(Outer<void>::Alias<void>::value == 1); // error
/************************ END SOURCE ************************/
The first static_assert compiles OK, but the second results in unexpected
errors:
/*********************** BEGIN OUTPUT ***********************/
<source>: In instantiation of 'struct Outer<void>::Inner<void>':
<source>:17:39: required from here
<source>:12:27: error: template argument 1 is invalid
12 | struct Outer<void>::Inner {
| ^
<source>:12:27: error: template argument 1 is invalid
<source>:13:27: error: template argument 1 is invalid
13 | static constexpr auto value = sizeof...(T);
| ^~~~~
<source>:13:27: error: template argument 1 is invalid
<source>:17:41: error: 'value' is not a member of 'Outer<void>::Alias<void>'
{aka 'Outer<void>::Inner<void>'}
17 | static_assert(Outer<void>::Alias<void>::value == 1); // error
| ^~~~~
Compiler returned: 1
/************************ END OUTPUT ************************/
The issue was discovered with build 9.0.0 20180813 (experimental), but appears
to exist in earlier versions as well.
For comparison, Clang compiles this code successfully.
Might be related to Bug 86956 and Bug 86958.
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Subject: [Bug libstdc++/86954] redundant nothrow in call of ::operator delete
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Arguably this was good defensive programming for C++03. The program could have
replaced operator new(size_t) and operator delete(void*) but not replaced
operator new(size_t, const nothrow_t&) and operator delete(void*, const
nothrow_t&). That would be undefined (C++03 [lib.new.delete.single] p7) but by
using the nothrow version of operator delete the library avoids mixing the
default version of new with a replaced version of delete. LWG 206 changed the
behaviour for C++11, so that combining the nothrow new and normal delete does
the right thing, but GCC has only met that requirement since yesterday.
I'm not sure it's worth changing anything here now. get_temporary_buffer was
deprecated and removed from C++2a anyway.
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Subject: [Bug libstdc++/86954] redundant nothrow in call of ::operator delete
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Tue Aug 14 20:19:20 2018
New Revision: 263542
URL: https://gcc.gnu.org/viewcvs?rev=263542&root=gcc&view=rev
Log:
PR libstdc++/86954 use non-placement operator delete
As explained in the PR, there's no reason to call the nothrow delete,
we can just use the normal one.
PR libstdc++/86954
* include/bits/stl_tempbuf.h (return_temporary_buffer): Use
non-placement delete.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/bits/stl_tempbuf.h
>From gcc-bugs-return-612784-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 20:21:04 2018
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Subject: [Bug libstdc++/86954] redundant nothrow in call of ::operator delete
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
On the other hand, with PR 68210 fixed the change is harmless. So fixed on
trunk.
Not suitable for backports though.
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--- Comment #12 from Jason Vas Dias <jason.vas.dias at gmail dot com> ---
RE: Comment #11 :
> notrace int _RETPOLINE_FUNC_ATTR_
> __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
should of course be
notrace _RETPOLINE_FUNC_ATTR_
int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
- sorry, I was typing from memory, not pasting.
>From gcc-bugs-return-612786-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 20:43:11 2018
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Subject: [Bug c++/86918] internal compiler error: unexpected expression 'v' of kind template_parm_index
Date: Tue, 14 Aug 2018 20:43:00 -0000
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--- Comment #4 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
I could not find a wording in the Standard that disallows this kind of
specialization (although certainly I might have overlooked it). A similar code
where the template parameter list is changed in a specialization compiles
successfully with GCC:
template<class>
struct Outer {
template<char... x>
struct Inner;
};
template<>
template<bool... x>
struct Outer<void>::Inner {
static constexpr auto value = sizeof...(x);
};
static_assert(Outer<void>::Inner<>::value == 0); // OK
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Subject: [Bug c++/65043] Expected narrowing conversion during list initialization of bool from double
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Testing a patch now.
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Subject: [Bug c++/86960] New: [Regression] internal compiler error: in coerce_template_parms
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Bug ID: 86960
Summary: [Regression] internal compiler error: in
coerce_template_parms
Product: gcc
Version: 8.2.0
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/****************** BEGIN SOURCE ******************/
template<class... T>
struct Outer {
template<T... x>
struct Inner;
};
template<>
template<bool x>
struct Outer<bool>::Inner {
static constexpr bool value = x;
};
static_assert(Outer<bool>::Inner<true>::value); /* internal compiler error: in
coerce_template_parms, at cp/pt.c:8533 */
/******************* END SOURCE *******************/
Fails in GCC 8.1 and 8.2, compiles successfully with 7.3.
Might be related to Bug 86918, Bug 86920, Bug 86956, Bug 86958.
>From gcc-bugs-return-612789-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 21:17:41 2018
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Subject: [Bug c++/86958] ICE in finish_member_declaration when an alias template is used
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--- Comment #4 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
Apparently, I somehow pasted a wrong code into this bug report. If you wish,
you can close this one, and I will file proper one(s).
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Subject: [Bug target/84908] retpoline weirdness: 7.3.0-1 and 4.8.5-16: with -fPIC: R_X86_64_PC32 against undefined symbol `__x86_indirect_thunk_rax'
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--- Comment #13 from Andy Lutomirski <luto at kernel dot org> ---
I find this whole discussion very confusing. The problem has nothing to do
with relocations AFAICT. The problem is that gcc is (as requested) generating
retpolines, and it's set up to do it by calling __x86_indirect_thunk_*, and
those helpers don't exist in the vDSO.
I also think that static inlines have anything to do with it. Nor so I see why
any function attributes make any sense.
The trivial fix is:
diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile
index 261802b1cc50..8140176b8b41 100644
--- a/arch/x86/entry/vdso/Makefile
+++ b/arch/x86/entry/vdso/Makefile
@@ -74,7 +74,7 @@ CFL := $(PROFILING) -mcmodel=small -fPIC -O2
-fasynchronous-unwind-tables -m64 \
-fno-omit-frame-pointer -foptimize-sibling-calls \
-DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
-$(vobjs): KBUILD_CFLAGS := $(filter-out
$(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
+$(vobjs): KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS)
$(RETPOLINE_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
#
# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
@@ -138,6 +138,7 @@ KBUILD_CFLAGS_32 := $(filter-out
-mcmodel=kernel,$(KBUILD_CFLAGS_32))
KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32))
KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
+KBUILD_CFLAGS_32 := $(filter-out $(RETPOLINE_CFLAGS),$(KBUILD_CFLAGS_32))
KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
but it might be better to use the internal thunk mechanism.
You said that Andi Kleen had a comment. Can you point me to it?
>From gcc-bugs-return-612792-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 21:19:53 2018
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Subject: [Bug c++/86958] ICE in finish_member_declaration when an alias template is used
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
OK, closing then.
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Subject: [Bug c++/86960] [Regression] internal compiler error: in coerce_template_parms
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-14
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
commit e5a3303f90fcbcba4d8cd9cdcc0a2c7f45958b25
Author: jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed Feb 26 17:08:20 2014 +0000
PR c++/54440
* pt.c (get_template_parm_index): New.
(fixed_parameter_pack_p_1, fixed_parameter_pack_p): New.
(process_template_parm): Allow bare packs in template template
parm template parms.
(coerce_template_parameter_pack): Handle fixed template template
parm packs and fixed packs not at the end of the parm list.
(coerce_template_parms): Handle template parm packs not at the end
of the parm list.
(gen_elem_of_pack_expansion_instantiation): Handle a decl
expansion.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@208178
138bc75d-0d04-0410-961f-82ee72b054a4
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--- Comment #1 from Harald Anlauf <anlauf at gmx dot de> ---
The bug also occurs with -Og. Maybe it's not a frontend problem.
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Subject: [Bug c++/86961] New: ICE in finish_member_declaration when an alias template is used
Date: Tue, 14 Aug 2018 21:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86961
Bug ID: 86961
Summary: ICE in finish_member_declaration when an alias
template is used
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: v.reshetnikov at gmail dot com
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/********************** BEGIN SOURCE **********************/
template<class>
struct Outer {
template<class>
struct Inner;
template<class T>
using Alias = Inner<T>;
};
template<>
template<class T>
struct Outer<bool>::Inner {
static constexpr auto value = sizeof(T);
};
static_assert(Outer<bool>::Inner<bool>::value == sizeof(bool)); // OK
static_assert(Outer<bool>::Alias<bool>::value == sizeof(bool)); // error
/*********************** END SOURCE ***********************/
The first static_assert compiles OK, but the second results in an ICE:
/********************** BEGIN OUTPUT **********************/
<source>: In instantiation of 'struct Outer<bool>::Inner<bool>':
<source>:17:39: required from here
<source>:13:27: internal compiler error: in finish_member_declaration, at
cp/semantics.c:3085
13 | static constexpr auto value = sizeof(T);
| ^~~~~
Compiler returned: 1
/*********************** END OUTPUT ***********************/
This issue was found with build 9.0.0 20180813 (experimental), but appears to
exist in earlier versions as well.
For comparison, Clang compiles this code successfully.
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Subject: [Bug fortran/86945] BUG with optimisation of select case statement in gfortran v8.x
Date: Tue, 14 Aug 2018 21:26:00 -0000
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--- Comment #2 from Harald Anlauf <anlauf at gmx dot de> ---
Changing the line:
case(:-1)
to
case(-HUGE(0):-1)
makes the bug disappear; changing it to
case(-HUGE(0)-1:-1)
makes it reappear.
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Subject: [Bug c++/86958] ICE in finish_member_declaration when an alias template is used
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Vladimir Reshetnikov <v.reshetnikov at gmail dot com> changed:
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--- Comment #6 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
I filed a corrected version as Bug 86961.
>From gcc-bugs-return-612797-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 21:33:29 2018
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Subject: [Bug c++/86915] Segmentation fault for an array of auto in template parameter
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Vladimir Reshetnikov <v.reshetnikov at gmail dot com> changed:
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--- Comment #4 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
Verified.
>From gcc-bugs-return-612798-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 21:34:25 2018
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Subject: [Bug c++/86728] [7/8/9 Regression] unexpected error: conversion from '<lambda(<type error>, ...)>' to non-scalar type 'std::function<void(int)>' requested
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Vladimir Reshetnikov <v.reshetnikov at gmail dot com> changed:
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--- Comment #7 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
Verified in 9.0.0 20180813 (experimental).
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Subject: [Bug c++/84839] [6/7 Regression] ICE (Segmentation fault) when `decltype` is used with parameter pack
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Vladimir Reshetnikov <v.reshetnikov at gmail dot com> changed:
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--- Comment #5 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
Verified.
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Subject: [Bug c++/84798] [6/7 Regression] ICE (Segmentation fault) if `auto` appears in a template argument
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--- Comment #11 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
Verified.
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Subject: [Bug c++/84840] [6/7/8 Regression] ICE (in poplevel_class) for `auto` in alias declaration
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--- Comment #3 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
Verified.
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Subject: [Bug fortran/86945] BUG with optimisation of select case statement in gfortran v8.x
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--- Comment #3 from Harald Anlauf <anlauf at gmx dot de> ---
Self contained alternative testcase:
program test
implicit none
integer, volatile :: id,ierr
id = 1
print*,'id=',id
call foo1 ()
print*,'ierr1, OK = ',ierr, ierr == 0
call foo2 ()
print*,'ierr2, OK = ',ierr, ierr == 0
contains
subroutine foo1 ()
select case(id)
case(-HUGE(0):-1)
ierr = id
case default
ierr = 0
end select
end subroutine foo1
subroutine foo2 ()
select case(id)
! case(-HUGE(0)-1:-1)
case( :-1)
ierr = id
case default
ierr = 0
end select
end subroutine foo2
end program test
With -O0:
id= 1
ierr1, OK = 0 T
ierr2, OK = 0 T
With -Og, -O1 and higher:
id= 1
ierr1, OK = 0 T
ierr2, OK = 1 F
>From gcc-bugs-return-612803-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 22:41:16 2018
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Subject: [Bug bootstrap/86872] [9 Regression] LTO bootstrap failed with profiledbootstrap
Date: Tue, 14 Aug 2018 22:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86872
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
line-map.c has
linemap_assert (reason != LC_ENTER_MACRO);
line_map_ordinary *map
= linemap_check_ordinary (new_linemap (set, start_location));
map->reason = reason;
We get here with reason != LC_ENTER_MACRO and create linemap with
start_location >= LINE_MAP_MAX_LOCATION.
>From gcc-bugs-return-612804-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 23:19:37 2018
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Subject: [Bug c/28848] argument mismatch for late-prototyped function should be warning, not error
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28848
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |msebor at gcc dot gnu.org
Resolution|--- |FIXED
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
The test was removed in r125974 but it compiles without an error or warning
now.
>From gcc-bugs-return-612805-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 23:19:40 2018
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Subject: [Bug other/29842] [meta-bug] outstanding patches / issues from STMicroelectronics
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Bug 29842 depends on bug 28848, which changed state.
Bug 28848 Summary: argument mismatch for late-prototyped function should be warning, not error
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28848
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |FIXED
>From gcc-bugs-return-612806-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 23:20:34 2018
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Subject: [Bug target/86731] [8/9 Regression] Miscompiles vec_sl at -O3 with -fwrapv on ppc64el
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--- Comment #1 from Will Schmidt <willschm at gcc dot gnu.org> ---
Created attachment 44542
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44542&action=edit
preliminary patch to resolve the problem
preliminary/rfc patch.
>From gcc-bugs-return-612807-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 14 23:21:07 2018
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Subject: [Bug target/86731] [8/9 Regression] Miscompiles vec_sl at -O3 with -fwrapv on ppc64el
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--- Comment #2 from Will Schmidt <willschm at gcc dot gnu.org> ---
Thanks for the bug report.
The patch (attached) has also been posted to gcc-patches for review.
Thanks,
>From gcc-bugs-return-612808-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 00:25:31 2018
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From: "frankhb1989 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/86954] redundant nothrow in call of ::operator delete
Date: Wed, 15 Aug 2018 00:25:00 -0000
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--- Comment #4 from frankhb1989 at gmail dot com ---
Well, actually I'm not sure if the original implementation has done the right
thing, as I don't find that the standard has requirement to specify that the
replaced definitions must acknowledge the fact nothrow_t overloads should only
be called on the specified condition (... and if so, whether it worth an LWG
issue).
But that still seems suspicious to me, because symmetry of call between
nothrow_t placement ::operator new and ::operator delete does not exist in the
language indeed, so that seems like an unintentional use unless it is
documented elsewhere. On the other hand, the change here towards to a simpler
and undoubtedly conformant way.
BTW, I do know the feature is deprecated in C++17 and removed in C++2a. I read
the paper of deprecation. It is plausible to be removed from the standard, but
not a must - not with a very strong reason. However, I am sure I do need that
feature so I have to reinvent my wheels... as done internally by various
standard library implementations. (More specifically, I need
std::_Temporary_buffer in libstdc++ and MSVC's current <algorithm>
implementation, or at least something equivalent to
std::__return_temporary_buffer in libc++, but surely I can't rely on them
directly.) At least a raw call of allocation function does not always express
the intended call site requirements clearly like std::get_temporary_buffer, so
users who want to make it clear have to afford the extra layer of an
abstraction. Arguably, the removal will bloat work for anyone wants that and
discourage clearer expression of intentions.
>From gcc-bugs-return-612809-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 00:59:55 2018
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Subject: [Bug target/86777] Bfin port needs updating for CVE-2017-5753
Date: Wed, 15 Aug 2018 00:59:00 -0000
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--- Comment #1 from Jie Zhang <jiez at gcc dot gnu.org> ---
(In reply to Richard Earnshaw from comment #0)
> The bfin port needs updating for this CVE. See the linked meta bug for
> details of possible actions required.
For Blackfin, the speculative load only happens when the load instruction is
the next instruction after conditional jump instruction. For example,
conditional jump
load
The above load will be speculatively executed. But
conditional jump
add
load
this load will not.
Is there a way to control speculation barrier being only inserted for the first
case, but not for the second case? Thanks.
Jie
>From gcc-bugs-return-612810-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 01:48:49 2018
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Subject: [Bug c++/67012] decltype(auto) with trailing return type
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Mathias Stearn <redbeard0531 at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |redbeard0531 at gmail dot com
--- Comment #1 from Mathias Stearn <redbeard0531 at gmail dot com> ---
Still repros with latest trunk builds, even with -pedantic:
https://godbolt.org/g/vMDcwg
>From gcc-bugs-return-612811-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 02:29:12 2018
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Subject: [Bug c++/69089] C++11: alignas(0) causes an error
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--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Dominik Vogt from comment #5)
> No, up to now you're the only one who commented on it. I keep pinging it
> once in a while.
Please keep pinging it!
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Subject: [Bug target/65604] MIPS -fno-delayed-branch generates incorrect code with -mcheck-zero-division
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #7)
>
> WAITING on an answer...
No reply so I'm assuming that this was fixed.
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Subject: [Bug target/86547] s390x: Maximum number of LRA assignment passes is achieved (30) when compiling a small inline assembler snippet
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--- Comment #8 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed Aug 15 04:09:45 2018
New Revision: 263548
URL: https://gcc.gnu.org/viewcvs?rev=263548&root=gcc&view=rev
Log:
PR target/86547
* lra-lives.c (remove_some_program_points_and_update_live_ranges):
Check whether lra_live_max_point is 0 before dividing.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/lra-lives.c
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Subject: [Bug target/86547] s390x: Maximum number of LRA assignment passes is achieved (30) when compiling a small inline assembler snippet
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Jeffrey A. Law <law at redhat dot com> changed:
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--- Comment #9 from Jeffrey A. Law <law at redhat dot com> ---
Fixed on the trunk.
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Subject: [Bug tree-optimization/86925] [9 Regression] ICE in get_predictor_value, at predict.c:2551
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Aug 15 08:55:15 2018
New Revision: 263552
URL: https://gcc.gnu.org/viewcvs?rev=263552&root=gcc&view=rev
Log:
Fix merging of 2 predictors (PR tree-optimization/86925).
2018-08-15 Martin Liska <mliska@suse.cz>
PR tree-optimization/86925
* predict.c (expr_expected_value_1): When taking
later predictor, assign also probability.
Use fold_build2_initializer_loc in order to fold
the expression in -frounding-math.
2018-08-15 Martin Liska <mliska@suse.cz>
PR tree-optimization/86925
* gcc.dg/predict-20.c: New test.
* gcc.dg/predict-21.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/predict-20.c
trunk/gcc/testsuite/gcc.dg/predict-21.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/predict.c
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Subject: [Bug tree-optimization/86925] [9 Regression] ICE in get_predictor_value, at predict.c:2551
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed now.
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Subject: [Bug target/81685] [7/8/9 Regression] FAIL: g++.dg/debug/dwarf2/inline-ns-2.C -std=gnu++* (internal compiler error) on darwin
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--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Wed Aug 15 09:19:39 2018
New Revision: 263553
URL: https://gcc.gnu.org/viewcvs?rev=263553&root=gcc&view=rev
Log:
Update Darwin section names for DWARF5
gcc/
2018-08-15 Iain Sandoe <iain@sandoe.co.uk>
PR target/81685
* config/darwin.h: (DEBUG_STR_OFFSETS_SECTION, DEBUG_LOCLISTS_SECTION,
DEBUG_RNGLISTS_SECTION) new macros. (DEBUG_PUBNAMES_SECTION,
DEBUG_PUBTYPES_SECTION) update to include GNU variant.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/darwin.h
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Subject: [Bug sanitizer/86962] New: [9 Regression] ICE in sanitize_rewrite_addressable_params, at sanopt.c:1173 with nested functions
Date: Wed, 15 Aug 2018 09:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86962
Bug ID: 86962
Summary: [9 Regression] ICE in
sanitize_rewrite_addressable_params, at sanopt.c:1173
with nested functions
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
ebotcazou at gcc dot gnu.org, jakub at gcc dot gnu.org,
kcc at gcc dot gnu.org, marxin at gcc dot gnu.org
Target Milestone: ---
Following causes ICE starting from r261687:
$ gcc
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/20030418-1.c
-fsanitize=address -c
during GIMPLE pass: sanopt
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/20030418-1.c:
In function ‘foo’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/20030418-1.c:9:6:
internal compiler error: in sanitize_rewrite_addressable_params, at
sanopt.c:1173
9 | void foo(int i)
| ^~~
0x67de04 sanitize_rewrite_addressable_params
/home/marxin/Programming/gcc/gcc/sanopt.c:1173
0xcf5411 execute
/home/marxin/Programming/gcc/gcc/sanopt.c:1287
Issues is that there's a param with DECL_HAS_VALUE_EXPR_P which is addressable.
We can probably skip these, but I'm curious Eric how that changed in your
commit?
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Subject: [Bug sanitizer/86962] [9 Regression] ICE in sanitize_rewrite_addressable_params, at sanopt.c:1173 with nested functions
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-15
Known to work| |8.2.0
Target Milestone|--- |9.0
Ever confirmed|0 |1
Known to fail| |9.0
>From gcc-bugs-return-612820-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 09:25:39 2018
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Subject: [Bug sanitizer/86962] [9 Regression] ICE in sanitize_rewrite_addressable_params, at sanopt.c:1173 with nested functions
Date: Wed, 15 Aug 2018 09:25:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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>From gcc-bugs-return-612821-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 09:57:15 2018
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From: "arjen.markus895 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/80931] ICE on move_alloc in gimplify_expr, at gimplify.c:11335
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Arjen Markus <arjen.markus895 at gmail dot com> changed:
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--- Comment #4 from Arjen Markus <arjen.markus895 at gmail dot com> ---
I ran into the same ICE, except that gfortran now reports that it happens at
line 11329 of gimplify.c and the program (module defining a simple class
actually) in which this happens is 168 lines long. I have tried to reduce it,
but anything I have tried leads to a disappearance of the fatal error.
This was with versions 6.2.0 (MinGW-w64/MSYS2) and 7.3.0 (Cygwin), should that
matter.
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Subject: [Bug fortran/83196] ICE in gfc_build_compare_string, at fortran/trans-expr.c:3609 (and others)
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Arjen Markus <arjen.markus895 at gmail dot com> changed:
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--- Comment #4 from Arjen Markus <arjen.markus895 at gmail dot com> ---
Created attachment 44543
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44543&action=edit
Sample module exhibiting the problem
ICE at line 11329 - any reduction seems to make the problem go away (but also
the functionality)
>From gcc-bugs-return-612823-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 10:01:52 2018
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Subject: [Bug fortran/83196] ICE in gfc_build_compare_string, at fortran/trans-expr.c:3609 (and others)
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--- Comment #5 from Arjen Markus <arjen.markus895 at gmail dot com> ---
(In reply to Arjen Markus from comment #4)
> Created attachment 44543 [details]
> Sample module exhibiting the problem
>
> ICE at line 11329 - any reduction seems to make the problem go away (but
> also the functionality)
Please ignore this - it is meant for a different issue. Somehow it ended up on
the wrong issue.
>From gcc-bugs-return-612824-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 10:03:45 2018
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Subject: [Bug c++/70693] valgrind error in get_visual_column
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
I'm starting to see in more often on periodic openSUSE package builds. David
any estimation about when you get to it?
>From gcc-bugs-return-612825-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 10:48:20 2018
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From: "rearnsha at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/86777] Bfin port needs updating for CVE-2017-5753
Date: Wed, 15 Aug 2018 10:48:00 -0000
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--- Comment #2 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
I don't think you could do that through the API provided by this patch set; but
it's not really appropriate for this case.
I'm not familiar with the bfin architecture so cannot comment on what the best
approach is, but it seems to me you have several options.
Use the speculation barrier not needed hook - this might apply if the
speculation is so limited that the CPU is not vulnerable to Spectre style
attacks.
Use the barrier anyway - this might apply if the processor vendor has defined a
barrier operation for this architecture, even if current implementations do not
need it (it might anticipate a new implementation that does need it).
Write a custom pass to handle it - from your description it looks like emitting
a NOP after every conditional branch may be sufficient to completely eliminate
the problem.
I created this PR because only the port maintainers (perhaps in discussion with
the manufacturers) can really decide what the best approach to handling this
issue must be.
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From: "jon_y at users dot sourceforge.net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/86856] Format warnings building all-gcc
Date: Wed, 15 Aug 2018 10:49:00 -0000
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--- Comment #10 from jon_y <jon_y at users dot sourceforge.net> ---
I noticed there are some casting from gcall to gimple, not being familiar with
gcc internals, is it the correct way to suppress the warnings?
>From gcc-bugs-return-612827-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 11:27:00 2018
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Subject: [Bug lto/86412] lto1: internal compiler error: in lto_symtab_prevailing_virtual_decl, at lto/lto-symtab.c
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David Binderman <dcb314 at hotmail dot com> changed:
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--- Comment #7 from David Binderman <dcb314 at hotmail dot com> ---
Still seeing this one in revision 263512, dated 20180813.
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Subject: [Bug target/84908] retpoline weirdness: 7.3.0-1 and 4.8.5-16: with -fPIC: R_X86_64_PC32 against undefined symbol `__x86_indirect_thunk_rax'
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84908
--- Comment #14 from Jason Vas Dias <jason.vas.dias at gmail dot com> ---
RE: Comment #13:
> You said that Andi Kleen had a comment. Can you point me to it?
Here is a quote, from LKML message :
Subject: Re: [PATCH v4.16-rc5 2/2] x86/vdso: \
VDSO should handle clock_gettime(CLOCK_MONOTONIC_RAW) \
without syscall Kernel
From: Andi Kleen<andi@firstfloor.org>
Date: 17 March 2018 at 23:00
To: jason.vas.dias@gmail.com
Cc: linux-kernel@vger.kernel.org, x86@kernel.org, tglx@linutronix.de,
mingo@kernel.org, peterz@infradead.org, andi@firstfloor.org
>On Sat, Mar 17, 2018 at 02:29:34PM +0000, jason.vas.dias@gmail.com wrote:
>> This patch allows compilation to succeed with compilers that
>> support -DRETPOLINE -
>> it was kindly contributed by H.J. Liu in GCC Bugzilla: 84908 :
>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84908
>>
>> Apparently the GCC retpoline implementation has a limitation
>> that it cannot handle switch statements with more than 5 clauses,
>> which vclock_gettime.c's
>> __vdso_clock_gettime function now conts.
>
>That's quite a mischaracterization of the issue. gcc works as intended,
>but the kernel did not correctly supply a indirect call retpoline thunk
>to the vdso, and it just happened to work by accident with the old
>vdso.
>
>>
>> The automated test builds should now succeed with this patch.
>
>How about just adding the thunk function to the vdso object instead of
>this cheap hack?
>
>The other option would be to build vdso with inline thunks.
>
>But just disabling is completely the wrong action.
>
>-Andi
So, in their wisdom, the kernel developers have decided it is
best to compile the VDSO with indirect-branch("thunk-extern,register"),
and we need to work around the limitations this imposes.
RE: Comment #13:
> I also think that static inlines have anything to do with it.
> Nor so I see why any function attributes make any sense.
On the contrary, I think function attributes and static inline-ness
have ALOT to do with it - the problem does not occur if the
called functions have the SAME indirect-branch attributes as
the caller function, or if the called function is not static inline.
It definitely appears to be something to do with GCC having to
instantiate a callable version of a static inline, when that
inline has different indirect-branch attributes than its caller.
The '-mindirect-branch=thunk-extern -mindirect-branch-register -DRETPOLINE'
flags should have the effect of making the default function attributes to be
'__attribute__((indirect-branch("thunk-extern,register"))'
for any function that does not specify other indirect-branch attributes,
so when instantiating this callable version of the inline GCC needs to
generate a thunk-extern relocation. The code which produces the special
stripped & augmented version of the VDSO object does not include support for
such relocations and complains about them, failing the builds.
I also have many unanswered questions about this bug, mentioned above -
perhaps H.J. could clarify ? :
o why exactly is it that the 6-clause switch in the first post triggers
the relocation, and the 5-clause switch does not?
why cannot this limitation be removed from GCC?
o why should GCC be trying to generate an extern thunk for
an indirect branch to a static inline function anyway ?
I think static-inlineness should always trump
indirect-branch("thunk-extern").
o GCC appears to provide no way for users to construct their own jump tables
without relocations - why does every reference to a PC-relative label
produce a relocation?
I do believe this
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Subject: [Bug bootstrap/86872] [9 Regression] LTO bootstrap failed with profiledbootstrap
Date: Wed, 15 Aug 2018 11:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86872
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
A patch is posted at
https://gcc.gnu.org/ml/gcc-patches/2018-08/msg00866.html
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From: "denin at mail dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/86963] New: std::tuple incorrectly assigned
Date: Wed, 15 Aug 2018 11:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86963
Bug ID: 86963
Summary: std::tuple incorrectly assigned
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: denin at mail dot ru
Target Milestone: ---
$ cat meow.cpp
#include <tuple>
#include <type_traits>
struct S {
S &operator=(S const &) = delete;
S &operator=(S &&) = delete;
};
static_assert(!std::is_move_assignable_v<std::tuple<S, S>>);
$ g++ meow.cpp
meow.cpp:8:15: error: static assertion failed
static_assert(!std::is_move_assignable_v<std::tuple<S, S>>);
^~~~
Despite tuple's elements being not assignable at all, tuple itself is
incorrectly considered assignable, due to non-SFINAE protected operator= in
class definition. Thus, the following code breaks on 'f = std::move(g);':
template<typename T> void mv_assign(T &left, T &&right) {
if constexpr(std::is_move_assignable_v<std::tuple<S, S>>) left =
std::move(right);
}
int main() {
std::tuple<S, S> f, g;
mv_assign(f, std::move(g));
}
ENVIRONMENT
$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --enable-multilib --disable-werror
--enable-checking=release --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 8.1.1 20180531 (GCC)
$ uname -a
Linux home 4.17.10-1-ARCH #1 SMP PREEMPT Wed Jul 25 11:23:00 UTC 2018 x86_64
GNU/Linux
>From gcc-bugs-return-612831-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 11:46:29 2018
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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/19315] document undocumented extension that allows code where variable is not emitted in the asm
Date: Wed, 15 Aug 2018 11:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19315
--- Comment #10 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Wed Aug 15 11:45:44 2018
New Revision: 263556
URL: https://gcc.gnu.org/viewcvs?rev=263556&root=gcc&view=rev
Log:
Don't make unsized objects into extern.
2018-08-15 Iain Sandoe <iain@sandoe.co.uk>
gcc/c:
PR c/19315
* c-decl.c (finish_decl): Don't add the 'extern' storage class to
objects of unknown size.
gcc/testsuite:
PR c/19315
gcc.dg/graphite/pr82451.c: Make array 'a' an extern.
gcc.dg/redecl-10.c: Expect warnings for the static vars with unknown
size.
Modified:
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-decl.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/graphite/pr82451.c
trunk/gcc/testsuite/gcc.dg/redecl-10.c
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Subject: [Bug libstdc++/86963] std::tuple incorrectly assigned
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is a new requirement in C++17, since https://wg21.link/lwg2729
Previous standards did not require the assignment to be deleted or removed from
overload resolution.
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Subject: [Bug libstdc++/86963] std::tuple incorrectly assigned
Date: Wed, 15 Aug 2018 12:17:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think we want a similar solution as for PR 86751 i.e. r263185
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Subject: [Bug gcov-profile/86957] gcc should warn about missing profiles for a compilation unit or a new function with -fprofile-use
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Last reconfirmed| |2018-08-15
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
I welcome that attempt.
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Subject: [Bug debug/86964] New: Too many debug symbols included, especially for extern globals
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86964
Bug ID: 86964
Summary: Too many debug symbols included, especially for extern
globals
Product: gcc
Version: 6.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: znerol at gmail dot com
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Created attachment 44544
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44544&action=edit
Sample code
When compiling with gcc -g using gcc 4.9, the debug symbols included,
especially for externally declared global variables, is at an expected and
familiar amount. When switching to gcc 6.3, the amount of debug symbols
included seems excessive and superfluous. Attempts at using flags such as:
-feliminate-unused-debug-symbols
-feliminate-unused-debug-types
-femit-struct-debug-baseonly
have yielded no difference. This creates a problem when working with a very
large codebase that yields large library archives that end up being several
orders of magnitude larger (file size) with the newer compiler vs. the older
one.
I've attached sources and test Makefile for a small program to illustrate what
I'm talking about. Below I include the difference in output between the 2
versions. In both cases, the symbols included in the final prog executable are
a summation of those in each of the object files - as expected - so I don't
think that behavior is wrong. But the key difference is in each of the object
files. With the older version, you only have symbols included that are relevant
to the module. With the newer version, you get every symbol for every variable
externally declared, even if it's not used or referenced in that module. This
has a multiplicative effect in the final executable's amount of debug info.
The attached sample program is mimicking source code structure seen in a very
large 3rd party SDK being worked with. The net effect of this problem results
in library archive files that are several orders of magnitude larger than
before. What used to be a few MB are now a few GB. What I'm looking for is a
flag or option that will make the newer version behave like the older version
with regard to the included debug info.
--------------------
Result with gcc 4.9
$ make
gcc -g -feliminate-unused-debug-symbols -c -o a.o a.c
gcc -g -feliminate-unused-debug-symbols -c -o b.o b.c
gcc -g -feliminate-unused-debug-symbols -c -o c.o c.c
gcc -g -feliminate-unused-debug-symbols -o prog a.o b.o c.o
a.o
<a5> DW_AT_name : (indirect string, offset: 0xb4): big_time
0x000000b0 696e7400 6269675f 74696d65 00756e73 int.big_time.uns
b.o
<1e> DW_AT_name : (indirect string, offset: 0x9): big_time
<40> DW_AT_name : (indirect string, offset: 0x0): big_mama
0x00000000 6269675f 6d616d61 00626967 5f74696d big_mama.big_tim
c.o
<1e> DW_AT_name : (indirect string, offset: 0x9): big_stuf
<40> DW_AT_name : (indirect string, offset: 0x0): big_leee
0x00000000 6269675f 6c656565 00626967 5f737475 big_leee.big_stu
prog
<a5> DW_AT_name : (indirect string, offset: 0x95): big_time
<ce> DW_AT_name : (indirect string, offset: 0x95): big_time
<f0> DW_AT_name : (indirect string, offset: 0xd7): big_mama
<123> DW_AT_name : (indirect string, offset: 0xe9): big_stuf
<145> DW_AT_name : (indirect string, offset: 0xe0): big_leee
0x00000090 20696e74 00626967 5f74696d 6500756e int.big_time.un
0x000000d0 7a657479 70650062 69675f6d 616d6100 zetype.big_mama.
0x000000e0 6269675f 6c656565 00626967 5f737475 big_leee.big_stu
---------------------
Result with gcc 6.3
$ make
gcc -g -feliminate-unused-debug-symbols -c -o a.o a.c
gcc -g -feliminate-unused-debug-symbols -c -o b.o b.c
gcc -g -feliminate-unused-debug-symbols -c -o c.o c.c
gcc -g -feliminate-unused-debug-symbols -o prog a.o b.o c.o
a.o
<312> DW_AT_name : (indirect string, offset: 0x20e): big_time
<31d> DW_AT_name : (indirect string, offset: 0x1eb): big_mama
<328> DW_AT_name : (indirect string, offset: 0x286): big_stuf
<333> DW_AT_name : (indirect string, offset: 0x90): big_leee
0x00000090 6269675f 6c656565 006c6f6e 6720696e big_leee.long in
0x000001e0 74005f49 4f5f4649 4c450062 69675f6d t._IO_FILE.big_m
0x00000280 6636345f 74006269 675f7374 7566005f f64_t.big_stuf._
b.o
<1e> DW_AT_name : (indirect string, offset: 0x9): big_time
<36> DW_AT_name : (indirect string, offset: 0x0): big_mama
<41> DW_AT_name : (indirect string, offset: 0x12): big_stuf
<4c> DW_AT_name : (indirect string, offset: 0x1b): big_leee
0x00000000 6269675f 6d616d61 00626967 5f74696d big_mama.big_tim
0x00000010 65006269 675f7374 75660062 69675f6c e.big_stuf.big_l
c.o
<1e> DW_AT_name : (indirect string, offset: 0x9): big_time
<36> DW_AT_name : (indirect string, offset: 0x0): big_mama
<41> DW_AT_name : (indirect string, offset: 0x12): big_stuf
<4c> DW_AT_name : (indirect string, offset: 0x1b): big_leee
0x00000000 6269675f 6d616d61 00626967 5f74696d big_mama.big_tim
0x00000010 65006269 675f7374 75660062 69675f6c e.big_stuf.big_l
prog
<312> DW_AT_name : (indirect string, offset: 0x1d2): big_time
<31d> DW_AT_name : (indirect string, offset: 0x1af): big_mama
<328> DW_AT_name : (indirect string, offset: 0x245): big_stuf
<333> DW_AT_name : (indirect string, offset: 0x84): big_leee
<379> DW_AT_name : (indirect string, offset: 0x1d2): big_time
<391> DW_AT_name : (indirect string, offset: 0x1af): big_mama
<39c> DW_AT_name : (indirect string, offset: 0x245): big_stuf
<3a7> DW_AT_name : (indirect string, offset: 0x84): big_leee
<3f2> DW_AT_name : (indirect string, offset: 0x1d2): big_time
<40a> DW_AT_name : (indirect string, offset: 0x1af): big_mama
<415> DW_AT_name : (indirect string, offset: 0x245): big_stuf
<420> DW_AT_name : (indirect string, offset: 0x84): big_leee
0x00000080 656e6400 6269675f 6c656565 005f666c end.big_leee._fl
0x000001d0 73006269 675f7469 6d65002f 686f6d65 s.big_time./home
0x00000240 36345f74 00626967 5f737475 66005f49 64_t.big_stuf._I
Version Info:
gcc 4.9:
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.9/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.2-10+deb8u1'
--with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.9 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-vtable-verify
--enable-plugin --with-system-zlib --disable-browser-plugin
--enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.9.2 (Debian 4.9.2-10+deb8u1)
gcc 6.3:
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/6/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 6.3.0-18+deb9u1'
--with-bugurl=file:///usr/share/doc/gcc-6/README.Bugs
--enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-6 --program-prefix=x86_64-linux-gnu- --enable-shared
--enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --disable-browser-plugin --enable-java-awt=gtk
--enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-6-amd64/jre
--enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-6-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-6-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--with-target-system-zlib --enable-objc-gc=auto --enable-multiarch
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --with-tune=generic --enable-checking=release
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1)
>From gcc-bugs-return-612836-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 15:22:22 2018
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From: "wilco at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgcc/86512] Incorrect sub result for float subnormal inputs in armv7(with -msoft-float).
Date: Wed, 15 Aug 2018 15:22:00 -0000
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Wilco <wilco at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |wilco at gcc dot gnu.org
--- Comment #3 from Wilco <wilco at gcc dot gnu.org> ---
We should still add a test for this case and backport.
>From gcc-bugs-return-612837-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 15:26:27 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/71625] missing strlen optimization on different array initialization style
Date: Wed, 15 Aug 2018 15:26:00 -0000
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--- Comment #18 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Wed Aug 15 15:25:46 2018
New Revision: 263561
URL: https://gcc.gnu.org/viewcvs?rev=263561&root=gcc&view=rev
Log:
PR tree-optimization/71625 - missing strlen optimization on different array
initialization style (avoid compilation errors on aarch64)
gcc/ChangeLog:
* config/aarch64/aarch64-builtins.c
(aarch64_init_simd_builtin_types): Clear Poly8_t's TYPE_STRING_FLAG.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/aarch64/aarch64-builtins.c
>From gcc-bugs-return-612838-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 15:46:02 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85412] [8/9 Regression] ICE in put_TImodes, at sel-sched.c:7191
Date: Wed, 15 Aug 2018 15:46:00 -0000
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Sergei Trofimovich <slyfox at inbox dot ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |slyfox at inbox dot ru
--- Comment #5 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Slightly shorter reproduced (shrunk with creduce):
// a.c
int a, b, c;
int e(int h) {
double d;
int f = 1;
while (b < 1) {
c = d + f;
if (b)
a /= h;
else {
long unsigned g;
f = 0;
d = h / g + h;
}
b = a / 3;
}
}
// command:
// x86_64-pc-linux-gnu-gcc-8.2.0 -c a.c -march=haswell -O2
-fselective-scheduling2 -fsel-sched-pipelining -fno-tree-ch -fno-tree-loop-im
>From gcc-bugs-return-612839-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 16:36:50 2018
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Subject: [Bug testsuite/86519] [9 Regression] New test case gcc.dg/strcmpopt_6.c fails with its introduction in r262636
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--- Comment #17 from qinzhao at gcc dot gnu.org ---
the patch has been committed as:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=263563
>From gcc-bugs-return-612840-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 16:51:59 2018
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From: "jason.duerstock at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85412] [8/9 Regression] ICE in put_TImodes, at sel-sched.c:7191
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--- Comment #6 from Jason Duerstock <jason.duerstock at gmail dot com> ---
The fix for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85354 wouldn't happen
to have caused this, would it?
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Subject: [Bug target/86965] New: nios2 optimizer forgets about known upper bits of register
Date: Wed, 15 Aug 2018 17:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86965
Bug ID: 86965
Summary: nios2 optimizer forgets about known upper bits of
register
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: already5chosen at yahoo dot com
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Created attachment 44545
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44545&action=edit
source code that demonstrates my case
Target: nios2-elf
Configured with: ../gcc-8.2.0/configure \
--target=nios2-elf \
--prefix=/home/m/opt/cross \
--disable-nls \
--enable-languages=c,c++ \
--without-headers \
--enable-multiarch
Thread model: single
gcc version 8.2.0 (GCC)
I am not sure if two cases in my report are related to each other. To me it
looks like they are since both cases appear related to optimizer losing track
of known state of upper 24 bits of register.
I know that bug writing guidelines discourage inclusion of the content of the
object file, but I made an effort to make it as short as possible. It really
looks like the only sane way to report.
00000000 <good1>:
0: 20c00007 ldb r3,0(r4)
4: 18bff404 addi r2,r3,-48
8: 28800015 stw r2,0(r5)
c: 18801960 cmpeqi r2,r3,101
10: 18c01120 cmpeqi r3,r3,68
14: 10c4b03a or r2,r2,r3
18: f800283a ret
0000001c <bad1>:
1c: 20800003 ldbu r2,0(r4)
20: 10c03fcc andi r3,r2,255
24: 18c0201c xori r3,r3,128
28: 18ffe004 addi r3,r3,-128
2c: 18fff404 addi r3,r3,-48
30: 108037cc andi r2,r2,223
34: 28c00015 stw r3,0(r5)
38: 10801160 cmpeqi r2,r2,69
3c: f800283a ret
#-- comments:
bad1 should generate approximately the same code as good1.
7 instructions instead of 9
Or, if compiler really wants to be smart, it can generate 6 instructions:
ldb r2,0(r4)
addi r3,r2,-48
stw r3,0(r5)
andi r2,r2,223 ; sign extension in bits[31..24] does not matter!
cmpeqi r2,r2,69
ret
#-- end of comments:
00000040 <good2>:
40: 21800007 ldb r6,0(r4)
44: 30c00b60 cmpeqi r3,r6,45
48: 31800ae0 cmpeqi r6,r6,43
4c: 28c00015 stw r3,0(r5)
50: 1986b03a or r3,r3,r6
54: 20c5883a add r2,r4,r3
58: f800283a ret
0000005c <bad2>:
5c: 21800007 ldb r6,0(r4)
60: 30c00b60 cmpeqi r3,r6,45
64: 31800ae0 cmpeqi r6,r6,43
68: 18803fcc andi r2,r3,255 # this instruction serves no purpose
6c: 1986b03a or r3,r3,r6
70: 28800115 stw r2,4(r5)
74: 28800015 stw r2,0(r5)
78: 20c5883a add r2,r4,r3
7c: f800283a ret
#-- comments:
bad2 should be identical to good2 except of addition of the second store.
#-- end of comments:
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Subject: [Bug c++/70693] valgrind error in get_visual_column
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
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--- Comment #8 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Working on a fix; sorry for the delay.
>From gcc-bugs-return-612843-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 17:42:12 2018
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Subject: [Bug c++/67012] decltype(auto) with trailing return type
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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>From gcc-bugs-return-612844-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 17:47:37 2018
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Subject: [Bug c++/86966] New: ICE (Segmentation fault) for an explicit specialization of a member class template
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Bug ID: 86966
Summary: ICE (Segmentation fault) for an explicit
specialization of a member class template
Product: gcc
Version: 9.0
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/************* SOURCE *************/
template<class... T>
struct S {
template<T...>
struct X { };
};
template<>
template<>
struct S<>::X { };
S<>::X<> x;
/*********** END SOURCE ***********/
/************* OUTPUT *************/
<source>:11:8: internal compiler error: Segmentation fault
11 | S<>::X<> x;
| ^
Compiler returned: 1
/*********** END OUTPUT ***********/
>From gcc-bugs-return-612845-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 17:50:12 2018
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Subject: [Bug c++/86966] ICE (Segmentation fault) for an explicit specialization of a member class template
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |ice-on-invalid-code
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed (but invalid?).
>From gcc-bugs-return-612846-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 18:20:07 2018
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From: "v.reshetnikov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86966] ICE (Segmentation fault) for an explicit specialization of a member class template
Date: Wed, 15 Aug 2018 18:20:00 -0000
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--- Comment #2 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
I believe the code is valid. We explicitly specialize the member class template
X of S for S<> (i.e. the parameter pack T is empty). T is expanded into a list
of zero non-type template parameters of S<>::X.
Here is a similar code where we specialize for S<bool>, i.e. provide one
template argument bool for the pack T:
template<class... T>
struct S {
template<T...>
struct X { };
};
template<>
template<bool>
struct S<bool>::X { };
Here T is expanded into a list of one non-type template parameter of type bool.
This code compiles successfully.
>From gcc-bugs-return-612847-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 19:03:46 2018
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Subject: [Bug sanitizer/86962] [9 Regression] ICE in sanitize_rewrite_addressable_params, at sanopt.c:1173 with nested functions
Date: Wed, 15 Aug 2018 19:03:00 -0000
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--- Comment #1 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Issues is that there's a param with DECL_HAS_VALUE_EXPR_P which is
> addressable. We can probably skip these, but I'm curious Eric how that
> changed in your commit?
It's a new object, i.e. a PARM_DECL with DECL_HAS_VALUE_EXPR_P. Before we
would create a VAR_DECL and leave the PARM_DECL orphaned.
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Subject: [Bug c++/86942] A trailing-return-type is allowed when the return type is not 'auto' for using declarations
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Tweaked example that is accepted:
using T = void() -> int;
void f ();
int
main ()
{
T *t = f;
}
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/70693] valgrind error in get_visual_column
Date: Wed, 15 Aug 2018 19:26:00 -0000
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--- Comment #9 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
The issue occurs due to a stray carriage return aka '\r' aka ^M, occurring
towards the end of line 35 of attachment 38289 - but not at the end itself.
This carriage return confuses our line numbering.
When lexing attachment 38289, the "break" token is recorded as being
at line 55 column 8:
(gdb) p next_tinfo
$1 = (const token_indent_info &) @0x7fffffffd3d0: {location = 382052, type =
CPP_KEYWORD, keyword = RID_BREAK}
...but input.c (and thus diagnostic-show-locus) are accessing the line beyond
for "line 55":
(gdb) call inform (382052, "'break' token is here")
../../src/attachment-38289.cc: In member function ‘bool
{anonymous}::SgmlFilter::process_char(FilterChar::Chr)’:
../../src/attachment-38289.cc:55:8: note: 'break' token is here
55 |
| ^
"cat -n" and emacs both agree with this latter numbering, showing the "break;"
as being on line 54, and with line 55 as that blank line.
This discrepancy between the lexer's line numbering and input.c's line
numbering leads to an out-of-range read in get_visual_column (trying to read
column 8, to locate the "break;", but finding the next line, which is only 4
characters long).
>From gcc-bugs-return-612850-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 19:58:04 2018
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Subject: [Bug c++/86966] ICE (Segmentation fault) for an explicit specialization of a member class template
Date: Wed, 15 Aug 2018 19:58:00 -0000
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--- Comment #3 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
Might be related to Bug 86960 and Bug 86918.
>From gcc-bugs-return-612851-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 20:22:34 2018
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Subject: [Bug c++/86942] A trailing-return-type is allowed when the return type is not 'auto' for using declarations
Date: Wed, 15 Aug 2018 20:22:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
>From gcc-bugs-return-612852-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 20:53:29 2018
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From: "anlauf at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/86945] BUG with optimisation of select case statement in gfortran v8.x
Date: Wed, 15 Aug 2018 20:53:00 -0000
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--- Comment #4 from Harald Anlauf <anlauf at gmx dot de> ---
(In reply to Harald Anlauf from comment #3)
> Self contained alternative testcase:
> With -Og, -O1 and higher:
>
> id= 1
> ierr1, OK = 0 T
> ierr2, OK = 1 F
The magic option is -fwrapv / -fno-wrapv.
With -Og -fwrapv:
ierr1, OK = 0 T
ierr2, OK = 0 T
With -Og -fno-wrapv:
ierr1, OK = 0 T
ierr2, OK = 1 F
Middle-end bug.
>From gcc-bugs-return-612853-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 20:58:07 2018
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From: "slyfox at inbox dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85412] [8/9 Regression] ICE in put_TImodes, at sel-sched.c:7191
Date: Wed, 15 Aug 2018 20:58:00 -0000
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Sergei Trofimovich <slyfox at inbox dot ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |abel at ispras dot ru
--- Comment #7 from Sergei Trofimovich <slyfox at inbox dot ru> ---
(In reply to Sergei Trofimovich from comment #5)
> Slightly shorter reproduced (shrunk with creduce):
>
> // a.c
> int a, b, c;
> int e(int h) {
> double d;
> int f = 1;
> while (b < 1) {
> c = d + f;
> if (b)
> a /= h;
> else {
> long unsigned g;
> f = 0;
> d = h / g + h;
> }
> b = a / 3;
> }
> }
>
> // command:
> // x86_64-pc-linux-gnu-gcc-8.2.0 -c a.c -march=haswell -O2
> -fselective-scheduling2 -fsel-sched-pipelining -fno-tree-ch -fno-tree-loop-im
Bisected this down from gcc-7.3.0 (did not ICE) to gcc-8.
Looks reasonable?
91d7a2f98a6846d6a4ac215abbbcf8e6154b9984 is the first bad commit
commit 91d7a2f98a6846d6a4ac215abbbcf8e6154b9984
Author: abel <abel@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon Apr 9 09:08:28 2018 +0000
PR rtl-optimization/83530
* sel-sched.c (force_next_insn): New global variable.
(remove_insn_for_debug): When force_next_insn is true, also leave
only
next insn in the ready list.
(sel_sched_region): When the region wasn't scheduled, make another
pass
over it with force_next_insn set to 1.
* gcc.dg/pr83530.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@259228
138bc75d-0d04-0410-961f-82ee72b054a4
:040000 040000 11825cae45f4d9839c242188123117a0a9f96803
87391fd9d4f97ee6fe456d1630f37801dc0bf8cc M gcc
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From: "nightstrike at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/86941] ICE in i386/winnt.c:1258 in i386_pe_seh_unwind_emit
Date: Wed, 15 Aug 2018 21:58:00 -0000
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nightstrike <nightstrike at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |uros at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=67967
--- Comment #1 from nightstrike <nightstrike at gmail dot com> ---
Related to PR 67967
>From gcc-bugs-return-612855-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 23:01:01 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug translation/79997] simple-ssa-sprintf i18n: wrong plural form in maybe_warn
Date: Wed, 15 Aug 2018 23:00:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Known to work| |8.1.0
Resolution|--- |FIXED
Known to fail| |7.3.0
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
I believe these issues were fixed in r258154.
>From gcc-bugs-return-612856-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 23:45:00 2018
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Subject: [Bug c/80076] -Wmisleading-indentation doesn't trigger when macro is misindented
Date: Wed, 15 Aug 2018 23:45:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-15
CC| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
Known to fail| |7.3.0, 8.2.0, 9.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed with GCC 7, 8, and trunk (9).
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From: "mascasa at google dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83428] Static initialization and struct with constexpr ctor
Date: Wed, 15 Aug 2018 23:58:00 -0000
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Matt Morehouse <mascasa at google dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mascasa at google dot com
--- Comment #2 from Matt Morehouse <mascasa at google dot com> ---
This also reproduces for me on x86_64 at ToT.
>From gcc-bugs-return-612858-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 15 23:59:00 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/81033] [8/9 Regression] there are cases where ld64 is not able to determine correct atom boundaries from the output GCC currently produces
Date: Wed, 15 Aug 2018 23:59:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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| |patches/2018-08/msg00798.ht
| |ml
--- Comment #43 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #42)
> (In reply to Elliot Saba from comment #41)
> > Has there been any progress on this? We are running into this while trying
> > to cross-compile GCC for Darwin. Has this been fixed in 8.3.0?
>
> I will be posting two patches (one just posted today) that are my proposed
> solution - basically, v2 above plus removing a target hook.
One is here: https://gcc.gnu.org/ml/gcc-patches/2018-08/msg00798.html
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From: "mark.melton at notlem dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/86967] New: time_get fails to parse abbreviated weekday with %A format string
Date: Thu, 16 Aug 2018 00:12:00 -0000
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Bug ID: 86967
Summary: time_get fails to parse abbreviated weekday with %A
format string
Product: gcc
Version: 8.2.0
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Priority: P3
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Created attachment 44546
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44546&action=edit
Small test case showing the bug.
The std::time_get::get(...) function fails to parse an abbreviated weekday name
when using the "%A" format specifier. It works corrected for the "%a" format
specifier where the two specifiers are simply synonyms of one another.
Using both "%A" and "%a", the function successfully parses the unabbreviated
weekday name.
See the attached short test case.
I have tested under both 8.2.0 and 7.3.0.
cheers,
mark
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Subject: [Bug c++/86966] ICE (Segmentation fault) for an explicit specialization of a member class template
Date: Thu, 16 Aug 2018 00:26:00 -0000
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--- Comment #4 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
Also, might be related to Bug 84796.
>From gcc-bugs-return-612861-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 00:29:42 2018
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Subject: [Bug c++/86960] [Regression] internal compiler error: in coerce_template_parms
Date: Thu, 16 Aug 2018 00:29:00 -0000
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--- Comment #2 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
Also, might be related to Bug 84796 and Bug 86961.
>From gcc-bugs-return-612862-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 00:32:09 2018
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Subject: [Bug c++/86961] ICE in finish_member_declaration when an alias template is used
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--- Comment #1 from Vladimir Reshetnikov <v.reshetnikov at gmail dot com> ---
Might be related to Bug 86956 and Bug 86959.
>From gcc-bugs-return-612863-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 01:09:30 2018
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From: "yangyibiao at nju dot edu.cn" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/85367] [GCOV] A call to the _subborrow_u64 builtin-function is wrongly marked as executed twice
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Yibiao Yang <yangyibiao at nju dot edu.cn> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|INVALID |WORKSFORME
--- Comment #2 from Yibiao Yang <yangyibiao at nju dot edu.cn> ---
As you mentioned that it works in gcc 8.1.1 while this bug exist in gcc 8.0.0.
Therefore, I change the bug status into worksforme.
>From gcc-bugs-return-612864-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 01:54:56 2018
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From: "sven.koehler at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/86968] New: Unaligned big-endian access on armv7-a yields 4 ldrb instructions rather than ldr+rev
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Bug ID: 86968
Summary: Unaligned big-endian access on armv7-a yields 4 ldrb
instructions rather than ldr+rev
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: sven.koehler at gmail dot com
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Created attachment 44547
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44547&action=edit
C source code illustrating the problem
armv7-a support unaligned memory access. In case of unaligned little-endian
access, gcc generates a single ldr instrction. Also, for aligned big-endian
access, gcc generates an ldr followed by a rev instruction (reverses byte
order).
However, when big-endian access is not aligned, gcc does not use ldr+rev.
Instead, it generates 4 ldrb instructions plus the code to move the 4 bytes
into a single register.
Find the source and generated assembler code attached.
My compiler command was
arm-none-eabi-gcc -O3 -mthumb -S -o - -march=armv7-a endian.c
The version of gcc is 8.2.0
>From gcc-bugs-return-612865-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 01:55:37 2018
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Subject: [Bug c/86968] Unaligned big-endian access on armv7-a yields 4 ldrb instructions rather than ldr+rev
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--- Comment #1 from Sven <sven.koehler at gmail dot com> ---
Created attachment 44548
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44548&action=edit
the generated assembler code
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Subject: [Bug middle-end/86968] Unaligned big-endian (scalar_storage_order) access on armv7-a yields 4 ldrb instructions rather than ldr+rev
Date: Thu, 16 Aug 2018 02:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86968
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Unaligned big-endian access |Unaligned big-endian
|on armv7-a yields 4 ldrb |(scalar_storage_order)
|instructions rather than |access on armv7-a yields 4
|ldr+rev |ldrb instructions rather
| |than ldr+rev
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
One comment about scalar_storage_order, it is not lowered until RTL time so it
never gets optimized by the tree level. I found scalar_storage_order almost
never to be very optimial at being optimized.
>From gcc-bugs-return-612867-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 02:25:29 2018
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From: "v.reshetnikov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86969] New: [Regression] ICE (in tsubst_copy) for a generic recursive lambda
Date: Thu, 16 Aug 2018 02:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86969
Bug ID: 86969
Summary: [Regression] ICE (in tsubst_copy) for a generic
recursive lambda
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Assignee: unassigned at gcc dot gnu.org
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/************************* BEGIN SOURCE *************************/
auto compose = [](auto... fs) {
if constexpr (sizeof...(fs) == 0) {
return [](auto x) { return x; };
} else {
auto fn = [](auto self, auto f, auto... fs) {
if constexpr (sizeof...(fs) == 0) return f;
else return [=](auto x) {
return f(self(self, fs...)(x));
};
};
return fn(fn, fs...);
}
};
static_assert(compose(
[](auto x) { return x * 3; },
[](auto x) { return x + 1; },
[](auto x) { return x / 2; }
)(6) == 12);
/************************** END SOURCE **************************/
EXPECTED: no errors.
ACTUAL:
<source>: In instantiation of '<lambda(auto:1 ...)> [with auto:1 =
{<lambda(auto:7)>, <lambda(auto:8)>, <lambda(auto:9)>}]::<lambda(auto:3,
auto:4, auto:5 ...)> [with auto:3 = <lambda(auto:1 ...)> [with auto:1 =
{<lambda(auto:7)>, <lambda(auto:8)>, <lambda(auto:9)>}]::<lambda(auto:3,
auto:4, auto:5 ...)>; auto:4 = <lambda(auto:7)>; auto:5 = {<lambda(auto:8)>,
<lambda(auto:9)>}]':
<source>:11:18: required from '<lambda(auto:1 ...)> [with auto:1 =
{<lambda(auto:7)>, <lambda(auto:8)>, <lambda(auto:9)>}]'
<source>:19:5: required from here
<source>:8:30: internal compiler error: in tsubst_copy, at cp/pt.c:15348
8 | return f(self(self, fs...)(x));
| ~~~~^~~~~~~~~~~~~
Compiles successfully with 7.3, fails with 8.1 and newer. Compiles successfully
with Clang. Looks similar to Bug 86926, but ICE location is different.
>From gcc-bugs-return-612868-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 03:27:59 2018
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From: "alkondratenko at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/83428] Static initialization and struct with constexpr ctor
Date: Thu, 16 Aug 2018 03:27:00 -0000
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Aliaksei Kandratsenka <alkondratenko at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |alkondratenko at gmail dot com
--- Comment #3 from Aliaksei Kandratsenka <alkondratenko at gmail dot com> ---
constructor is defined after variable in this example. I am not sure this real
bug.
>From gcc-bugs-return-612869-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 04:29:27 2018
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From: "jbassett271 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86970] New: Rejected constexpr expression involving lambdas and inheritance, "use of this in a constant expression"
Date: Thu, 16 Aug 2018 04:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86970
Bug ID: 86970
Summary: Rejected constexpr expression involving lambdas and
inheritance, "use of this in a constant expression"
Product: gcc
Version: 8.1.0
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Created attachment 44549
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44549&action=edit
The .ii file from -save-temps
The following code fails to compile under g++-8:
Command: g++-8 -Wall -Wextra -std=c++17 min.cpp
Compiler Explorer link: https://godbolt.org/g/iByFDC
#include <tuple>
#include <utility>
namespace ns {
template <typename A>
class Foo : private A
{
public:
template <typename FA>
explicit constexpr Foo(FA&& a)
: A{std::forward<FA>(a)}
{}
};
template <typename A>
Foo(A)->Foo<A>;
template <typename T>
constexpr auto frobnicate(T&& val)
{
return [val = std::forward<T>(val)] {};
}
template <typename A, typename B>
class Bar
{
A a;
std::tuple<B> b;
public:
template <typename FA, typename FB>
explicit constexpr Bar(FA&& a, FB&& b)
: a{a}
, b{b}
{}
};
template <typename A, typename B>
Bar(A, B)->Bar<A, B>;
constexpr auto Baz = ns::Foo{ns::frobnicate(ns::Bar{[] {}, [](int) {}})};
}
Compiler diagnostics:
min.cpp:41:76: error: ‘constexpr ns::Foo<A>::Foo(FA&&) [with FA =
ns::frobnicate(T&&) [with T = ns::Bar<ns::<lambda()>, ns::<lambda(int)>
>]::<lambda()>; A = ns::frobnicate(T&&) [with T = ns::Bar<ns::<lambda()>,
ns::<lambda(int)> >]::<lambda()>]’ called in a constant expression
constexpr auto Baz = ns::Foo{ns::frobnicate(ns::Bar{[] {}, [](int) {}})};
^
min.cpp:10:28: note: ‘constexpr ns::Foo<A>::Foo(FA&&) [with FA =
ns::frobnicate(T&&) [with T = ns::Bar<ns::<lambda()>, ns::<lambda(int)>
>]::<lambda()>; A = ns::frobnicate(T&&) [with T = ns::Bar<ns::<lambda()>,
ns::<lambda(int)> >]::<lambda()>]’ is not usable as a ‘constexpr’ function
because:
explicit constexpr Foo(FA&& a)
^~~
min.cpp:11:36: error: call to non-‘constexpr’ function ‘ns::frobnicate(T&&)
[with T = ns::Bar<ns::<lambda()>, ns::<lambda(int)>
>]::<lambda()>::<lambda>(ns::frobnicate(T&&) [with T = ns::Bar<ns::<lambda()>,
ns::<lambda(int)> >]::<lambda()>&&)’
: A{std::forward<FA>(a)}
^
min.cpp:21:46: note: ‘ns::frobnicate(T&&) [with T = ns::Bar<ns::<lambda()>,
ns::<lambda(int)> >]::<lambda()>::<lambda>(ns::frobnicate(T&&) [with T =
ns::Bar<ns::<lambda()>, ns::<lambda(int)> >]::<lambda()>&&)’ is not usable as a
‘constexpr’ function because:
return [val = std::forward<T>(val)] {};
^
min.cpp:21:46: error: use of ‘this’ in a constant expression
System info (from running `g++-8 -v`):
Using built-in specs.
COLLECT_GCC=g++-8
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
8.1.0-5ubuntu1~16.04' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-8
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib
--with-target-system-zlib --enable-objc-gc=auto --enable-multiarch
--disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 8.1.0 (Ubuntu 8.1.0-5ubuntu1~16.04)
If this is not a bug in GCC, but the code is invalid, perhaps the diagnostic
could be improved. The diagnostics end in a lambda, saying "use of this in a
constant expression", which is confusing, considering that the lambda is not in
a context where `this` is valid and `this` does not appear to be used there.
>From gcc-bugs-return-612870-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 05:00:50 2018
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From: "r030t1 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86971] New: -Wabi warns it will not warn about anything.
Date: Thu, 16 Aug 2018 05:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86971
Bug ID: 86971
Summary: -Wabi warns it will not warn about anything.
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
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Noticed while compiling GCC 8.2.0:
cc1plus: warning: -Wabi won't warn about anything [-Wabi]
This isn't the most pressing issue, but I think the wording should be modified;
perhaps:
cc1plus: warning: -Wabi won't warn about anything else [-Wabi]
>From gcc-bugs-return-612871-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 06:58:29 2018
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From: "aes368 at cornell dot edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/86972] New: Incorrect array-bounds warning with -O2 when creating pointer from array
Date: Thu, 16 Aug 2018 06:58:00 -0000
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Bug ID: 86972
Summary: Incorrect array-bounds warning with -O2 when creating
pointer from array
Product: gcc
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int *p;
int main() {
int a[1];
p = a - 1;
}
The above code raises the warning:
warning: array subscript -1 is below array bounds of ‘int [1]’ [-Warray-bounds]
p = a - 1;
~~^~~
when compiled with
gcc -O2 -Wall
I see this both on 7.3.0 and 8.2.0.
The subscript detected seems to always be the term added to a, though it does
not raise a warning with 0 or +1.
>From gcc-bugs-return-612872-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 08:02:27 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/83428] Static initialization and struct with constexpr ctor
Date: Thu, 16 Aug 2018 08:01:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Aliaksei Kandratsenka from comment #3)
> constructor is defined after variable in this example. I am not sure this
> real bug.
Agreed. If we use Clang and add its require_constant_initialization attribute
to the variable definition it tells us:
83428.cc:20:54: error: variable does not have a constant initializer
__attribute__((require_constant_initialization)) S2 objX;
^~~~
83428.cc:20:17: note: required by 'require_constant_initialization' attribute
here
__attribute__((require_constant_initialization)) S2 objX;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
83428.cc:12:7: note: undefined constructor 'S1' cannot be used in a constant
expression
: m_tabS1()
^
83428.cc:20:54: note: in call to 'S2()'
__attribute__((require_constant_initialization)) S2 objX;
^
83428.cc:3:15: note: declared here
constexpr S1 ();
^
1 error generated.
If the S1::S1() constructor is defined before the definition of objX then Clang
doesn't warn and GCC doesn't use dynamic initialization.
>From gcc-bugs-return-612873-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 08:16:29 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/86973] New: [6/7/8/9 Regression] ICE in expand_call, at calls.c:4217
Date: Thu, 16 Aug 2018 08:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86973
Bug ID: 86973
Summary: [6/7/8/9 Regression] ICE in expand_call, at
calls.c:4217
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at gcc dot gnu.org
Target Milestone: ---
Following ICEs starting from r222173:
$ cat ice.i
__attribute__((sysv_abi))
void a(__attribute__((__vector_size__(8 * sizeof(double)))) double b,
__builtin_va_list c) {
__builtin_va_arg(c, int);
}
$ gcc -fsanitize=thread -c -mabi=ms -mavx512f ice.i
during RTL pass: expand
ice.i: In function ‘a’:
ice.i:3:24: internal compiler error: in expand_call, at calls.c:4217
3 | __builtin_va_list c) {
| ^
0x89d231 expand_call(tree_node*, rtx_def*, int)
/home/marxin/Programming/gcc/gcc/calls.c:4215
0x88d4f5 expand_builtin(tree_node*, rtx_def*, rtx_def*, machine_mode, int)
/home/marxin/Programming/gcc/gcc/builtins.c:8122
0x9b9e81 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
/home/marxin/Programming/gcc/gcc/expr.c:10911
0x8afb99 expand_expr
/home/marxin/Programming/gcc/gcc/expr.h:279
0x8afb99 expand_call_stmt
/home/marxin/Programming/gcc/gcc/cfgexpand.c:2687
0x8afb99 expand_gimple_stmt_1
/home/marxin/Programming/gcc/gcc/cfgexpand.c:3575
0x8afb99 expand_gimple_stmt
/home/marxin/Programming/gcc/gcc/cfgexpand.c:3734
0x8b0a8f expand_gimple_basic_block
/home/marxin/Programming/gcc/gcc/cfgexpand.c:5770
0x8b57f7 execute
/home/marxin/Programming/gcc/gcc/cfgexpand.c:6373
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-612874-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 08:18:05 2018
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Subject: [Bug sanitizer/86973] [6/7/8/9 Regression] ICE in expand_call, at calls.c:4217
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-16
Known to work| |5.4.0
Ever confirmed|0 |1
Known to fail| |6.4.0, 7.3.0, 8.2.0, 9.0
>From gcc-bugs-return-612875-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 08:24:06 2018
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Subject: [Bug c/19315] document undocumented extension that allows code where variable is not emitted in the asm
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Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #11 from Iain Sandoe <iains at gcc dot gnu.org> ---
fixed on trunk
>From gcc-bugs-return-612876-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 08:26:08 2018
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Subject: [Bug libstdc++/86971] -Wabi warns it will not warn about anything.
Date: Thu, 16 Aug 2018 08:26:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|c++ |libstdc++
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No, the wording is correct, "anything else" would not make sense.
You need to look at the full output:
cc1plus: warning: -Wabi won't warn about anything [-Wabi]
cc1plus: note: -Wabi warns about differences from the most up-to-date ABI,
which is also used by default
cc1plus: note: use e.g. -Wabi=11 to warn about changes from GCC 7
This has already been fixed on trunk with r262824
>From gcc-bugs-return-612877-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 08:31:25 2018
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Subject: [Bug c++/86974] New: Support Clang's require_constant_initialization attribute
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86974
Bug ID: 86974
Summary: Support Clang's require_constant_initialization
attribute
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: enhancement
Priority: P3
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As documented at
https://clang.llvm.org/docs/AttributeReference.html#require-constant-initialization-clang-require-constant-initialization
This attribute is very useful to check that a global uses constant
initialization, thus avoiding the Static Initialization Order Fiasco.
For example, see PR 83428 where it was mistakenly believed that the variable
should not be dynamically initialized, but actually there was a bug in the code
preventing it.
If the variable will not get constant initialization Clang gives an error and
states the reason for dynamic init:
83428.cc:20:54: error: variable does not have a constant initializer
__attribute__((require_constant_initialization)) S2 objX;
^~~~
83428.cc:20:17: note: required by 'require_constant_initialization' attribute
here
__attribute__((require_constant_initialization)) S2 objX;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
83428.cc:12:7: note: undefined constructor 'S1' cannot be used in a constant
expression
: m_tabS1()
^
83428.cc:20:54: note: in call to 'S2()'
__attribute__((require_constant_initialization)) S2 objX;
^
83428.cc:3:15: note: declared here
constexpr S1 ();
^
1 error generated.
So this doesn't change the meaning of any code, it just acts as an assertion
that a property is true.
>From gcc-bugs-return-612878-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 08:42:49 2018
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Subject: [Bug target/86975] New: wrong peephole optimization applied on nios2 and mips targets
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Bug ID: 86975
Summary: wrong peephole optimization applied on nios2 and mips
targets
Product: gcc
Version: 8.2.0
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On MIPS and Nios2 architectures logical instruction immediate (andi, ori)
zero-extend immediate field. It means that on this targets small negative
constants in logical expressions are more expensive than small (or not so
small) positive constants. Peephole optimization phase should take it into
account when selecting substitution patterns, but right now it's not smart
enough.
Code:
int isE(int x) { return (x=='e') || (x=='E') ; }
RISV32 (-Os -rv32im) :
00000000 <isE>:
0: fdf57513 andi a0,a0,-33
4: fbb50513 addi a0,a0,-69
8: 00153513 seqz a0,a0
c: 8082 ret
That's good, because RISC-V sign-extends field in logical instructions which
means that it has no problems with small integer constants.
MIPS ( -Os -mips32r6 -mcompact-branches=always) :
00000000 <isE>:
0: 2402ffdf li v0,-33
4: 00821024 and v0,a0,v0
8: 38420045 xori v0,v0,0x45
c: 2c420001 sltiu v0,v0,1
10: d81f0000 jrc ra
Nios2 (-Os) :
00000000 <isE>:
0: 00bff7c4 movi r2,-33
4: 2084703a and r2,r4,r2
8: 10801160 cmpeqi r2,r2,69
c: f800283a ret
That not so good. Both of them are sub-optimal.
These targets should use substitution pattern based on small positive constant.
Like that:
MIPS:
00000000 <smarter_isE>:
0: 34820020 ori v0,a0,0x20
4: 38420065 xori v0,v0,0x65
8: 2c420001 sltiu v0,v0,1
c: d81f0000 jrc ra
Nios2:
00000000 <smarter_isE>:
0: 20800814 ori r2,r4,32
4: 10801960 cmpeqi r2,r2,101
8: f800283a ret
>From gcc-bugs-return-612879-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 08:44:39 2018
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Subject: [Bug libstdc++/86971] -Wabi warns it will not warn about anything.
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
--- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
I think the wording of the opening line can be made unambiguous, which is
probably nice for translators. Can we change it to say e.g.:
cc1plus: warning: -Wabi by itself does not issue any warnings
>From gcc-bugs-return-612880-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 08:46:06 2018
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Subject: [Bug libstdc++/86976] New: [meta-bug] Issues with std::time_get, std::time_put etc.
Date: Thu, 16 Aug 2018 08:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86976
Bug ID: 86976
Summary: [meta-bug] Issues with std::time_get, std::time_put
etc.
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: meta-bug
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Depends on: 9635, 9780, 45896, 71367, 71557, 78714, 86967
Target Milestone: ---
This is a meta-bug for issues in the std::locale time category.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=9635
[Bug 9635] time_get<>::date_order unimplemented
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=9780
[Bug 9780] issues with time_get, time_put not being tied to correct _punct
facet.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45896
[Bug 45896] [C++0x] Facet time_get not reading dates according to the IEEE 1003
standard.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71367
[Bug 71367] std::time_get does not implement 'r' or 'p'
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71557
[Bug 71557] time_get is case sensitive
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78714
[Bug 78714] std::get_time / std::time_get::get does not accept full month name
in %b
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86967
[Bug 86967] time_get fails to parse abbreviated weekday with %A format string
>From gcc-bugs-return-612881-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 08:47:52 2018
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Subject: [Bug c++/86971] -Wabi warns it will not warn about anything.
Date: Thu, 16 Aug 2018 08:47:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Component|libstdc++ |c++
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
OK so let's change the component back to c++ then.
>From gcc-bugs-return-612882-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 08:51:38 2018
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Subject: [Bug libstdc++/86976] [meta-bug] Issues with std::time_get, std::time_put etc.
Date: Thu, 16 Aug 2018 08:51:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-16
Depends on| |79833, 84216, 77760
Ever confirmed|0 |1
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77760
[Bug 77760] get_time needs to set tm_wday amd tm_yday
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79833
[Bug 79833] std::put_time has the wrong values for 2 digit years
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84216
[Bug 84216] std::get_time fails to parse output from std::put_time, but
strptime can parse them (c++11)
>From gcc-bugs-return-612883-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 08:58:06 2018
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Subject: [Bug libstdc++/83906] Random FAIL: libstdc++-prettyprinters/80276.cc whatis p4
Date: Thu, 16 Aug 2018 08:58:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|8.3 |---
>From gcc-bugs-return-612884-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 09:03:53 2018
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Subject: [Bug c++/83615] A reference binding involving a qualification conversion is rejected
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-612885-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 09:05:19 2018
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Subject: [Bug libstdc++/83607] std::boyer_moore_searcher is slow searching through arrays of std::byte
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |8.0
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I'm no longer planning to backport this to gcc-7-branch. It's fixed for GCC 8.1
and later.
>From gcc-bugs-return-612886-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 09:08:42 2018
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Subject: [Bug c/86972] [6/7/8/9 Regression] Incorrect array-bounds warning with -O2 when creating pointer from array
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-16
CC| |marxin at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Summary|Incorrect array-bounds |[6/7/8/9 Regression]
|warning with -O2 when |Incorrect array-bounds
|creating pointer from array |warning with -O2 when
| |creating pointer from array
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with Richi's r222146.
>From gcc-bugs-return-612887-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 09:13:48 2018
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Subject: [Bug target/86745] [9 regression] gcc.target/i386/avx-cvt-2.c etc. FAIL on 64-bit x86
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Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-16
Assignee|unassigned at gcc dot gnu.org |ubizjak at gmail dot com
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--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 44550
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44550&action=edit
Proposed patch
The combine is now able to combine memory operand with the instruction,
creating:
vcvtps2pd f(%rip), %ymm0
This doesn't match the pattern.
The matching pattern is too tight, attached patch "fixes" the PR.
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Subject: [Bug libstdc++/86977] New: [g++ 8.1.0-5ubuntu1~14.04] error: static assertion failed: unordered container must have the same value_type as its allocator
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86977
Bug ID: 86977
Summary: [g++ 8.1.0-5ubuntu1~14.04] error: static assertion
failed: unordered container must have the same
value_type as its allocator
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: joao at neto dot pt
Target Milestone: ---
**I'm not sure this is a bug; but I couldn't find alternate root cause. Sorry
if it's not!**
The following code can be compiled successfully in `g++-6` and `g++-7`, but not
in `g++-8`, which results in an error:
```
In file included from /usr/include/c++/8/unordered_map:46,
from /usr/include/c++/8/functional:61,
from test.cpp:3:
/usr/include/c++/8/bits/hashtable.h: In instantiation of ‘class
std::_Hashtable<int, std::pair<const int, Thing>,
boost::interprocess::allocator<void, boost::interprocess::segment_manager<char,
boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>,
boost::interprocess::iset_index> >, std::__detail::_Select1st,
std::equal_to<int>, std::hash<int>, std::__detail::_Mod_range_hashing,
std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy,
std::__detail::_Hashtable_traits<false, false, true> >’:
/usr/include/c++/8/bits/unordered_map.h:105:18: required from ‘class
std::unordered_map<int, Thing, std::hash<int>, std::equal_to<int>,
boost::interprocess::allocator<void, boost::interprocess::segment_manager<char,
boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>,
boost::interprocess::iset_index> > >’
test.cpp:30:15: required from here
/usr/include/c++/8/bits/hashtable.h:192:21: error: static assertion failed:
unordered container must have the same value_type as its allocator
static_assert(is_same<typename _Alloc::value_type, _Value>{},
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
```
#include <sys/mman.h>
#include <sys/syscall.h>
#include <functional>
#include <memory>
#include <unordered_map>
#include <string>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/shared_memory_object.hpp>
class Thing {
public:
volatile Thing *_parent;
explicit Thing(Thing *parent) : _parent(parent) {}
};
namespace ipc = boost::interprocess;
using Segment = ipc::managed_shared_memory;
using Manager = Segment::segment_manager;
template <typename T> using Alloc = ipc::allocator<T, Manager>;
template <typename K, typename V, typename KH = std::hash<K>, typename KEq =
std::equal_to<K>>
using HashMap = std::unordered_map<K, V, KH, KEq, Alloc<void>>;
typedef HashMap<pid_t, Thing> ThingMap;
int main() {
boost::interprocess::shared_memory_object::remove("test");
Segment my_segment{ipc::create_only, "test", 1ul<<40};
Manager *my_manager = my_segment.get_segment_manager();
ThingMap *my_map =
my_segment.find_or_construct<ThingMap>("my_map")(my_manager);
my_map->emplace(123, nullptr);
printf("Hello world\n");
return 0;
}
```
The code can be seen on GitHub, and there is a Travis build reproducing the
issue. I've posted on StackOverflow but got no replies.
https://github.com/joaomlneto/clang-tidbit
https://travis-ci.com/joaomlneto/clang-tidbit/builds/81896897
https://stackoverflow.com/questions/51858747/compilation-tidbits-on-g-clang-using-libboost-g8-compilation-fails-wh
Using `libboost 1.54` (default for `apt-get install libboost-all-dev` in Ubuntu
14.04).
Compiled with `$(CXX) -std=c++17 $^ -o $@ -pthread -ldl -rdynamic -lrt`
If I change to `-std=gnu++17`, then it works.
https://travis-ci.com/joaomlneto/clang-tidbit/builds/81897835
Below is information on the system (although is a pretty standard Ubuntu
14.04):
```
# g++-8 -v
Using built-in specs.
COLLECT_GCC=g++-8
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
8.1.0-5ubuntu1~14.04' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-8
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=gcc4-compatible --disable-libstdcxx-dual-abi
--enable-gnu-unique-object --disable-vtable-verify --enable-libmpx
--enable-plugin --with-system-zlib --with-target-system-zlib
--enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib
--with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 8.1.0 (Ubuntu 8.1.0-5ubuntu1~14.04)
```
```
# uname -a
Linux d0710afa7fb5 4.15.0-30-generic #32-Ubuntu SMP Thu Jul 26 17:42:43 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux
```
```
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty
```
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Subject: [Bug libstdc++/86977] [g++ 8.1.0-5ubuntu1~14.04] error: static assertion failed: unordered container must have the same value_type as its allocator
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to João Neto from comment #0)
> using HashMap = std::unordered_map<K, V, KH, KEq, Alloc<void>>;
This is invalid, the allocator's value type is not the same as the container's
value type (which is exactly what the error tells you!)
GCC will accept it as an extension in -std=gnu++17 mode, but you compiled with
-std=c++17 which disables the non-standard extension.
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--- Comment #1 from mateuszb at poczta dot onet.pl ---
This bug is when you configure GCC with option
--enable-fully-dynamic-string
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
Leaving unassigned as I'm not planning to working on that.
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Subject: [Bug libstdc++/86977] [g++ 8.1.0-5ubuntu1~14.04] error: static assertion failed: unordered container must have the same value_type as its allocator
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--- Comment #2 from João Neto <joao at neto dot pt> ---
Hi Jonathan! Thanks for the quick reply!
Two follow-up questions:
(1) Shouldn't it be also flagged as an error in `gcc-6` and `gcc-7` with
`-std=c++17`?
(2) How can I reliably find the node-type allocated by the map if I'd want to
use `-std=c++17`? Isn't it implementation-defined?
https://stackoverflow.com/questions/49736817/stdunordered-map-with-boostinterprocess-allocator-in-shared-memory-drawbac/49738871#49738871
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Aug 16 10:16:17 2018
New Revision: 263579
URL: https://gcc.gnu.org/viewcvs?rev=263579&root=gcc&view=rev
Log:
Backport r263246
2018-08-16 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-08-02 Martin Liska <mliska@suse.cz>
PR sanitizer/86022
* sanitizer_common/sanitizer_linux_libcdep.cc (ThreadDescriptorSize):
Cherry-pick compiler-rt revision 338606.
Modified:
branches/gcc-8-branch/libsanitizer/ChangeLog
branches/gcc-8-branch/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Aug 16 10:16:32 2018
New Revision: 263580
URL: https://gcc.gnu.org/viewcvs?rev=263580&root=gcc&view=rev
Log:
Backport r263248
2018-08-16 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-08-02 Martin Liska <mliska@suse.cz>
PR gcov-profile/86817
* gcov.c (process_all_functions): New function.
(main): Call it.
(process_file): Move functions processing to
process_all_functions.
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/gcov.c
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From: "joao at neto dot pt" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/86977] [g++ 8.1.0-5ubuntu1~14.04] error: static assertion failed: unordered container must have the same value_type as its allocator
Date: Thu, 16 Aug 2018 10:19:00 -0000
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--- Comment #3 from João Neto <joao at neto dot pt> ---
>
> (2) How can I reliably find the node-type allocated by the map if I'd want
> to use `-std=c++17`? Isn't it implementation-defined?
>
Please ignore my stupidity. c++17 has a `node_type`
The other one I think is relevant though.
(Sorry for the spam!)
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Subject: [Bug sanitizer/86022] TCB size calculated in ThreadDescriptorSize() is wrong for glibc-2.14
Date: Thu, 16 Aug 2018 10:19:00 -0000
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--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Aug 16 10:19:16 2018
New Revision: 263581
URL: https://gcc.gnu.org/viewcvs?rev=263581&root=gcc&view=rev
Log:
Backport r263246
2018-08-16 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-08-02 Martin Liska <mliska@suse.cz>
PR sanitizer/86022
* sanitizer_common/sanitizer_linux_libcdep.cc (ThreadDescriptorSize):
Cherry-pick compiler-rt revision 338606.
Modified:
branches/gcc-7-branch/libsanitizer/ChangeLog
branches/gcc-7-branch/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc
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Subject: [Bug gcov-profile/86817] [8 Regression] Misleading warning in gcov since r254672
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-612898-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 10:20:37 2018
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Subject: [Bug sanitizer/86022] TCB size calculated in ThreadDescriptorSize() is wrong for glibc-2.14
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-612899-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 10:29:04 2018
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Subject: [Bug bootstrap/81397] mistakes in .opt files not detected
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
As we're staying with Awk, for now I'm planning to work on that.
>From gcc-bugs-return-612900-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 10:29:15 2018
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Subject: [Bug libstdc++/86977] [g++ 8.1.0-5ubuntu1~14.04] error: static assertion failed: unordered container must have the same value_type as its allocator
Date: Thu, 16 Aug 2018 10:29:00 -0000
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to João Neto from comment #2)
> Hi Jonathan! Thanks for the quick reply!
>
> Two follow-up questions:
>
> (1) Shouldn't it be also flagged as an error in `gcc-6` and `gcc-7` with
> `-std=c++17`?
No because the static assertion was only added in gcc 8.
> (2) How can I reliably find the node-type allocated by the map if I'd want
> to use `-std=c++17`? Isn't it implementation-defined?
(In reply to João Neto from comment #3)
> Please ignore my stupidity. c++17 has a `node_type`
No, that's nothing to do with it.
Read the error message! Or read comment 1!
The allocator's value type must be the same as the container's VALUE TYPE. Not
its node type. I really don't know how to make the static assertion any
clearer.
The container's value_type is std::pair<const K, V>.
>From gcc-bugs-return-612902-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 10:31:31 2018
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Subject: [Bug fortran/86545] [6/7/8/9 Regression] ICE in transfer_expr on invalid WRITE statement
Date: Thu, 16 Aug 2018 10:31:00 -0000
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--- Comment #4 from janus at gcc dot gnu.org ---
(In reply to janus from comment #1)
> I guess the problem is the absence of the error message that one gets when
> calling the specific function directly, without going through the generic
> interface:
>
> write(*,*) trim_string(s) ! correctly rejected
> 1
> Error: Data transfer element at (1) cannot have ALLOCATABLE components
> unless it is processed by a defined input/output procedure
That error message comes from resolve_transfer (in resolve.c).
>From gcc-bugs-return-612901-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 10:31:31 2018
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Subject: [Bug c++/52477] Wrong initialization order? __attribute__((constructor)) vs static data access
Date: Thu, 16 Aug 2018 10:31:00 -0000
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--- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> ---
Well, after we documented that can we simply close it?
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Subject: [Bug testsuite/78544] FAIL: gcc.dg/tree-prof/section-attr-*.c compilation, -fprofile-generate -D_PROFILE_GENERATE on darwin
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--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Thu Aug 16 10:33:03 2018
New Revision: 263583
URL: https://gcc.gnu.org/viewcvs?rev=263583&root=gcc&view=rev
Log:
fix section naming convention for Darwin in three tests
2018-08-15 Iain Sandoe <iain@sandoe.co.uk>
gcc/testsuite:
PR testsuite/78544
* gcc.dg/tree-prof/section-attr-1.c: Add Darwin-specific section
attributes and matching.
* gcc.dg/tree-prof/section-attr-2.c: Likewise.
* gcc.dg/tree-prof/section-attr-3.c: Likewise.
6
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/tree-prof/section-attr-1.c
trunk/gcc/testsuite/gcc.dg/tree-prof/section-attr-2.c
trunk/gcc/testsuite/gcc.dg/tree-prof/section-attr-3.c
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Subject: [Bug target/84711] AArch32 big-endian fails when taking subreg of a vector mode to a scalar mode.
Date: Thu, 16 Aug 2018 10:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84711
--- Comment #17 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Author: tnfchris
Date: Thu Aug 16 10:39:13 2018
New Revision: 263584
URL: https://gcc.gnu.org/viewcvs?rev=263584&root=gcc&view=rev
Log:
Update fall through pattern for FP16 patterns in ARM.
The original issue comes from the fact that the code does
... foo (... bar)
{
return bar;
}
The expansion of the return statement causes GCC to try to return the value in
a register. GCC will try to emit the move then, from MEM to REG (due to the
SSA
temporary.). It checks for a mov optab for this which isn't available and
then tries to do the move in bits using emit_move_multi_word.
emit_move_multi_word will split the move into sub parts, but then needs to get
the sub parts and does this using subregs, but it's told it can't do subregs!
The compiler is now stuck in an infinite loop.
The way this is worked around in the back-end is that we have move patterns in
neon.md that usually just force the register instead of checking with the
back-end. This prevents emit_move_multi_word from being needed. However the
pattern for V4HF and V8HF were guarded by TARGET_NEON && TARGET_FP16.
I don't believe the TARGET_FP16 guard to be needed, because the pattern doesn't
actually generate code and requires another pattern for that, and a reg to reg
move
should always be possible anyway. So allowing the force to register here is
safe
and it allows the compiler to generate a correct error instead of ICEing in an
infinite loop.
gcc/
2018-08-16 Tamar Christina <tamar.christina@arm.com>
PR target/84711
* config/arm/arm.c (arm_can_change_mode_class): Disallow subreg.
* config/arm/neon.md (movv4hf, movv8hf): Refactored to..
(mov<mov>): ..this and enable unconditionally.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/arm/arm.c
trunk/gcc/config/arm/neon.md
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Subject: [Bug libstdc++/86447] gcc 9.0 from r262456 can't build cross compiler for mingw-w64 target
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Ever confirmed|0 |1
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Subject: [Bug c++/52477] Wrong initialization order? __attribute__((constructor)) vs static data access
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--- Comment #14 from Rainer Orth <ro at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #13)
> Well, after we documented that can we simply close it?
Quite the contrary: that documents a *current* limitation! See Jason's comment
#6
for what needs to happen.
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Subject: [Bug libstdc++/71641] 22_locale/time_get/get_date/wchar_t/4.cc runs failure if static linking
Date: Thu, 16 Aug 2018 11:35:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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URL| |https://sourceware.org/bugz
| |illa/show_bug.cgi?id=23164
Resolution|--- |DUPLICATE
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
There are two different issues causing this test to fail. It consistently fails
on gcc20 in the compiler farm, even with dynamic linking, which might be the
case for hppa-linux too.
On gcc20 it fails because errorstate == failbit, which happens because the
D_FMT string does not match what the testcase expects.
On my Fedora system D_FMT for the zh_TW locale is "西元%Y年%m月%d日" but on gcc20
(Debian 7.11) it's "%Y年%m月%d日".
The static linking case depends on whether libc is linked statically or not,
because it doesn't fail with -static-libstdc++, so this is the same as
https://sourceware.org/bugzilla/show_bug.cgi?id=23164 (and so a duplicate of PR
85732).
Here's my simplified C testcase:
#define _GNU_SOURCE
#include <locale.h>
#include <langinfo.h>
#include <stdio.h>
int main()
{
locale_t loc = newlocale(1 << LC_ALL, "zh_TW.UTF-8", 0);
const char* dfmt = nl_langinfo_l(D_FMT, loc);
printf("date format: %s\n", dfmt);
while (*dfmt)
printf("\\x%x", (unsigned char)*dfmt++);
printf("\n");
return 0;
}
On Fedora 27 (glibc 2.26) this prints:
date format: 西元%Y年%m月%d日
\xe8\xa5\xbf\xe5\x85\x83\x25\x59\xe5\xb9\xb4\x25\x6d\xe6\x9c\x88\x25\x64\xe6\x97\xa5
On Debian 7.11 (glibc 2.13) this prints:
date format: %Y年%m月%d日
\x25\x59\xe5\xb9\xb4\x25\x6d\xe6\x9c\x88\x25\x64\xe6\x97\xa5
And on either system with static linking it fails to find the locale data:
date format: %m/%d/%y
\x25\x6d\x2f\x25\x64\x2f\x25\x79
So this is not a libstdc++ bug, it's a glibc bug. Debian's glibc 2.13 has bad
locale data for zh_TW, and all versions of glibc have the static linking bug.
*** This bug has been marked as a duplicate of bug 85732 ***
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Subject: [Bug libstdc++/85732] use_facet<moneypunct<char, true>>(mylocale) retrieving wrong locale information
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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CC| |cctsai57 at gmail dot com
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 71641 has been marked as a duplicate of this bug. ***
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Subject: [Bug c++/52477] Wrong initialization order? __attribute__((constructor)) vs static data access
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--- Comment #15 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Rainer Orth from comment #14)
> (In reply to Martin Liška from comment #13)
> > Well, after we documented that can we simply close it?
>
> Quite the contrary: that documents a *current* limitation! See Jason's
> comment #6
> for what needs to happen.
I see, thanks for clarification.
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From: "h2+bugs at fsfe dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86978] New: constraints for friend functions ignored
Date: Thu, 16 Aug 2018 12:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86978
Bug ID: 86978
Summary: constraints for friend functions ignored
Product: gcc
Version: c++-concepts
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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Take the following code:
template <typename t>
struct S
{
template <typename t2>
requires false
friend void foobar(S, t2) {}
};
int main()
{
foobar(S<double>{}, int{});
}
Obviously the friend function should never be available, but the code compiles
just fine, because apparently the constraints on friend functions are ignored
entirely? This took quite long to find, because there is no diagnostic of any
kind, just wrong behaviour.
Tested with GCC 7.3 and 8.1 on godbolt.org
I think this explains https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68093 as
well, because of the constraints are stripped from friend functions than two
functions which differ only in constraints appear as redefinitions.
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Subject: [Bug fortran/80931] ICE on move_alloc in gimplify_expr, at gimplify.c:11335
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--- Comment #5 from snowfed <snowfed at mail dot ru> ---
If you don't mind my asking, are you the Fortran book author Arjen Markus?
>From gcc-bugs-return-612912-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 12:02:56 2018
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From: "h2+bugs at fsfe dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/68093] [concepts] friend function declarations that differ only by constraints are rejected as redefinitions
Date: Thu, 16 Aug 2018 12:02:00 -0000
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Hannes Hauswedell <h2+bugs at fsfe dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |h2+bugs at fsfe dot org
--- Comment #2 from Hannes Hauswedell <h2+bugs at fsfe dot org> ---
Constraints on friend member functions seemed to be stripped entirely,
therefore making two functions with only different constraints appear the same:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86978
>From gcc-bugs-return-612913-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 12:05:16 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/51618] synchronous futures are slow
Date: Thu, 16 Aug 2018 12:05:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-16
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Confirming as an enhancement request, though I'm not sure what (if anything) is
possible here. Multiple threads can still call wait() on a std::future, and
only the first should run the deferred function. The others need to synchronize
on the invocation, and the completion.
We should at least investigate and see if there's any improvement that can be
made.
>From gcc-bugs-return-612914-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 12:09:34 2018
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Subject: [Bug fortran/80931] ICE on move_alloc in gimplify_expr, at gimplify.c:11335
Date: Thu, 16 Aug 2018 12:09:00 -0000
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--- Comment #6 from Arjen Markus <arjen.markus895 at gmail dot com> ---
Yes, I am :).
Regards,
Arjen
2018-08-16 14:02 GMT+02:00 snowfed at mail dot ru <gcc-bugzilla@gcc.gnu.org>:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80931
>
> --- Comment #5 from snowfed <snowfed at mail dot ru> ---
> If you don't mind my asking, are you the Fortran book author Arjen Markus?
>
> --
> You are receiving this mail because:
> You are on the CC list for the bug.
>From gcc-bugs-return-612915-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 12:21:01 2018
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Subject: [Bug middle-end/86968] Unaligned big-endian (scalar_storage_order) access on armv7-a yields 4 ldrb instructions rather than ldr+rev
Date: Thu, 16 Aug 2018 12:21:00 -0000
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--- Comment #3 from Sven <sven.koehler at gmail dot com> ---
I'm not familiar with GCC internals. So my following comments may be completely
off.
This has been classified as a "missed optimization". I would not expect the
optimizer to change 4 ldrb into a single ldr. This seems like a code generation
issue to me, not like an optimization issue. As can be seen with -O0, the
aligned big endian access uses a single ldr but the unaligned big endian access
uses the 4 ldrb.
It seems gcc behaves like this:
if (big_endian_access) {
if (aligned_access) {
issue "ldr"
issue "rev"
} else {
issue 4 "ldrb" in big-endian order
}
} else {
if (aligned_access || arch_supports_unaligned) {
issue "ldr"
} else {
issue 4 "ldrb" in little-endian order
}
}
When instead, gcc should behave like this:
if (aligned_access || arch_supports_unaligned) {
issue "ldr"
if (big_endian_access) {
issue "rev"
}
} else {
if (big_endian_access) {
issue 4 "ldrb" in big-endian order
} else {
issue 4 "ldrb" in little-endian order
}
}
>From gcc-bugs-return-612916-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 13:11:15 2018
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Subject: [Bug fortran/86945] [8/9 Regression] BUG with optimisation of select case statement in gfortran
Date: Thu, 16 Aug 2018 13:11:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|UNCONFIRMED |NEW
Known to work| |7.3.0
Keywords| |wrong-code
Last reconfirmed| |2018-08-16
Ever confirmed|0 |1
Summary|BUG with optimisation of |[8/9 Regression] BUG with
|select case statement in |optimisation of select case
|gfortran v8.x |statement in gfortran
Target Milestone|--- |8.3
Known to fail| |8.2.0, 9.0
--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The bug appeared between revisions r251624 (2017-09-03, OK) and r251946
(2017-09-10, wrong code).
>From gcc-bugs-return-612917-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 13:30:53 2018
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Subject: [Bug middle-end/86979] New: [9 Regression] ICE: in maybe_record_trace_start, at dwarf2cfi.c:2348 with -m32 on darwin
Date: Thu, 16 Aug 2018 13:30:00 -0000
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Bug ID: 86979
Summary: [9 Regression] ICE: in maybe_record_trace_start, at
dwarf2cfi.c:2348 with -m32 on darwin
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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Target Milestone: ---
On x86_64-apple-darwin17the test gcc.c-torture/compile/pr69102.c fails with
-m32
% gfc /opt/gcc/work/gcc/testsuite/gcc.c-torture/compile/pr69102.c -Og
-fschedule-insns2 -fselective-scheduling2 -fno-tree-fre
--param=max-sched-extend-regions-iters=2 -m32
during RTL pass: dwarf2
/opt/gcc/work/gcc/testsuite/gcc.c-torture/compile/pr69102.c: In function 'foo':
/opt/gcc/work/gcc/testsuite/gcc.c-torture/compile/pr69102.c:23:1: internal
compiler error: in maybe_record_trace_start, at dwarf2cfi.c:2348
23 | }
| ^
Revision r263503 was OK, r263560 is not.
>From gcc-bugs-return-612918-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 13:34:35 2018
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Subject: [Bug c++/86969] [Regression] ICE (in tsubst_copy) for a generic recursive lambda
Date: Thu, 16 Aug 2018 13:34:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-16
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-612919-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 13:40:16 2018
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Subject: [Bug c++/86969] [8/9 Regression] ICE (in tsubst_copy) for a generic recursive lambda
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Summary|[Regression] ICE (in |[8/9 Regression] ICE (in
|tsubst_copy) for a generic |tsubst_copy) for a generic
|recursive lambda |recursive lambda
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
commit 10b389b8b205392d32d6d181dc1dbc05cff4e311
Author: jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue Apr 3 17:41:12 2018 +0000
PR c++/85149 - generic lambda and constexpr if.
* pt.c (build_extra_args, add_extra_args): Split from
tsubst_pack_expansion.
(tsubst_expr) [IF_STMT]: Use them.
* cp-tree.h (IF_STMT_EXTRA_ARGS): New.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@259043
138bc75d-0d04-0410-961f-82ee72b054a4
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Subject: [Bug c++/68093] [concepts] friend function declarations that differ only by constraints are rejected as redefinitions
Date: Thu, 16 Aug 2018 13:52:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-16
Ever confirmed|0 |1
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Subject: [Bug c++/86978] [concepts] constraints for friend functions ignored
Date: Thu, 16 Aug 2018 13:54:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Version|c++-concepts |8.1.0
Resolution|--- |DUPLICATE
Summary|constraints for friend |[concepts] constraints for
|functions ignored |friend functions ignored
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Seems like a dup. I'll add your case to the other bug.
*** This bug has been marked as a duplicate of bug 68093 ***
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Subject: [Bug c++/68093] [concepts] friend function declarations that differ only by constraints are rejected as redefinitions
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 86978 has been marked as a duplicate of this bug. ***
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Subject: [Bug c++/68093] [concepts] friend function declarations that differ only by constraints are rejected as redefinitions
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is the accepts-invalid example from PR 86978:
template <typename t>
struct S
{
template <typename t2>
requires false
friend void foobar(S, t2) {}
};
int main()
{
foobar(S<double>{}, int{});
}
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From: "neeraj.sharma at alumni dot iitg.ernet.in" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86980] New: Lambda function with return type rvalue reference dtor issue
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86980
Bug ID: 86980
Summary: Lambda function with return type rvalue reference dtor
issue
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: neeraj.sharma at alumni dot iitg.ernet.in
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Created attachment 44551
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44551&action=edit
preprocessed file for bug
## Summary
The following code misbehaves as the destructor is called before move ctor (see
the console output further below). I not sure as to what is going wrong here!
// ---
auto f = []() -> Traceable&& {
Traceable tmp;
return std::move(tmp);
};
// compiler will call move ctor here because the
// anonymous function above returns a lvalue
//
// Note: One ctor, one move ctor and two dtor invoked
Traceable a = f();
// x--
## Console output
[0x7ffe7d335ca7] ctor Traceable
[0x7ffe7d335ca7] dtor Traceable
[0x7ffe7d335cd7] move ctor Traceable, &other = 0x7ffe7d335ca7
[0x7ffe7d335cd7] dtor Traceable
## Workaround
If I remove the return type then things work as expected.
// ---
auto f = []() {
Traceable tmp;
return std::move(tmp);
};
// compiler will call move ctor here because the
// anonymous function above returns a lvalue
//
// Note: One ctor, one move ctor and two dtor invoked
Traceable a = f();
// x--
## GCC Version Information
Using built-in specs.
COLLECT_GCC=g++-8
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
8.1.0-5ubuntu1~16.04' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-8
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib
--with-target-system-zlib --enable-objc-gc=auto --enable-multiarch
--disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 8.1.0 (Ubuntu 8.1.0-5ubuntu1~16.04)
## Build Command
g++-8 -save-temps -std=c++17 -Wall -Wextra -g -I include/ -I /usr/local/include
-MP -MMD bug.cpp
Note: No compiler warnings or errors were reported by the above command.
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Subject: [Bug fortran/81849] Size of automatic array argument specified by host-associated variable.
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Jürgen Reuter <juergen.reuter at desy dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |juergen.reuter at desy dot de
--- Comment #3 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Confirmed. Still present in gfortran 9.0.
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Subject: [Bug target/86640] [8/9 regression] ICE in combine
Date: Thu, 16 Aug 2018 14:33:00 -0000
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--- Comment #13 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Author: tnfchris
Date: Thu Aug 16 14:32:18 2018
New Revision: 263589
URL: https://gcc.gnu.org/viewcvs?rev=263589&root=gcc&view=rev
Log:
Backporting two Arm fixes from mainline fixing PR86640
gcc/testsuite/
2018-07-31 Segher Boessenkool <segher@kernel.crashing.org>
PR target/86640
* gcc.target/arm/pr86640.c: New testcase.
gcc/
2018-07-31 Segher Boessenkool <segher@kernel.crashing.org>
PR target/86640
* gcc.target/arm/pr86640.c: New testcase.
Added:
branches/gcc-8-branch/gcc/testsuite/gcc.target/arm/pr86640.c
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/config/arm/arm.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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--- Comment #54 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Grepping for IN in the execution traces and then running
a diff reveals interesting things:
IN: __libc_start_main
IN: __libc_start_main
IN: _dl_discover_osversion
-IN: uname
-IN: uname
+IN: __uname
+IN: __uname
IN: _dl_discover_osversion
IN: _dl_discover_osversion
IN: _dl_discover_osversion
@@ -53,18 +53,18 @@
IN: __udivsi3
IN: __udivsi3
IN: __libc_setup_tls
-IN: sbrk
-IN: sbrk
+IN: __sbrk
+IN: __sbrk
IN: __brk
IN: __brk
IN: __brk
-IN: sbrk
-IN: sbrk
-IN: sbrk
-IN: sbrk
-IN: sbrk
-IN: sbrk
-IN: sbrk
+IN: __sbrk
+IN: __sbrk
+IN: __sbrk
+IN: __sbrk
+IN: __sbrk
+IN: __sbrk
+IN: __sbrk
[...]
@@ -445,12 +446,13 @@
IN: _gfortran_set_options
IN: _gfortran_set_options
IN: _gfortran_set_options
-IN: bsd_signal
-IN: bsd_signal
+IN: ssignal
+IN: ssignal
IN: __bsd_signal.part.0
IN: __bsd_signal.part.0
-IN: __sigaction
-IN: __sigaction
+IN: sigaction
+IN: sigaction
+IN: sigaction
IN: __libc_sigaction
IN: __libc_sigaction
IN: memcpy
It seems that the test case is calling a different C library
version with and without the patch; especially, it is using
the bsd_signal function without the patch and ssignal with it.
This is strange, to say the least, and points towards a basic
problem with the OS, or the emulator...
I am a bit at a loss of how to proceed.
>From gcc-bugs-return-612928-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 14:51:35 2018
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Subject: [Bug c++/86980] Lambda function with return type rvalue reference dtor issue
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is a bug in your code, not GCC. you're returning a reference to a local
variable, which goes out of scope, leaving a dangling reference.
When you don't give the lambda an explicit return type it returns by value, so
works correctly.
You should just do:
auto f = []() {
Traceable tmp;
return tmp;
};
This returns by value and can elide the move, so is safer and faster.
>From gcc-bugs-return-612929-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 15:04:36 2018
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Subject: [Bug c++/86981] New: Add Clang's -Wpessmizing-move warning
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Bug ID: 86981
Summary: Add Clang's -Wpessmizing-move warning
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: enhancement
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#include <utility>
struct T {
T() { }
T(const T&) { }
T(T&&) { }
};
T f() {
T t;
return std::move(t);
}
Clang warns about this:
m.cc:5:21: warning: moving a local object in a return statement prevents copy
elision [-Wpessimizing-move]
T f() { T t; return std::move(t); }
^
m.cc:5:21: note: remove std::move call here
T f() { T t; return std::move(t); }
^~~~~~~~~~ ~
1 warning generated.
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Subject: [Bug c++/67906] Missing warning about std::move without effect
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--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Kinda related: PR 86981
>From gcc-bugs-return-612931-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 15:07:52 2018
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Subject: [Bug c++/86981] Add Clang's -Wpessmizing-move warning
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2018-08-16
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
>From gcc-bugs-return-612932-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 15:13:43 2018
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Subject: [Bug c++/86982] New: Make -Wreturn-local-addr know about std::move and std::forward
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86982
Bug ID: 86982
Summary: Make -Wreturn-local-addr know about std::move and
std::forward
Product: gcc
Version: 9.0
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This fails to warn:
#include <utility>
int&& f() { int i = 0; return std::move(i); }
The equivalent code using a static_cast to rvalue reference warns:
move.cc: In function 'int&& f2()':
move.cc:3:52: warning: reference to local variable 'i' returned
[-Wreturn-local-addr]
3 | int&& f2() { int i = 0; return static_cast<int&&>(i); }
| ^
move.cc:3:18: note: declared here
3 | int&& f2() { int i = 0; return static_cast<int&&>(i); }
| ^
This leads to bugs in users' code, like PR 86980.
As std::move is so fundamental to modern C++ I think it deserves special
treatment by the front end, to ensure this warns. (The special handling might
be useful for implementing PR 86981 as well).
It would be great to do the same for std::forward, which has the same problem:
#include <utility>
int&& f() { int i = 0; return std::move(i); }
int&& g() { int i = 0; return std::forward<int>(i); }
std::forward can also be used to return references to temporaries:
int&& h() { long l = 0; return std::forward<int>(l); }
Again, the equivalent with a static_cast gives a warning:
move.cc: In function 'int&& h2()':
move.cc:5:53: warning: returning reference to temporary [-Wreturn-local-addr]
5 | int&& h2() { long l = 0; return static_cast<int&&>(l); }
|
>From gcc-bugs-return-612933-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 15:56:45 2018
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Subject: [Bug libstdc++/86447] gcc 9.0 from r262456 can't build cross compiler for mingw-w64 target
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Should be fixed - thanks for the report.
>From gcc-bugs-return-612934-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 15:56:59 2018
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Subject: [Bug libstdc++/86447] gcc 9.0 from r262456 can't build cross compiler for mingw-w64 target
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu Aug 16 15:56:21 2018
New Revision: 263590
URL: https://gcc.gnu.org/viewcvs?rev=263590&root=gcc&view=rev
Log:
Fix bootstrap with --enable-fully-dynamic-string
PR libstdc++/86447
* src/c++11/cow-stdexcept.cc [_GLIBCXX_FULLY_DYNAMIC_STRING]
(logic_error::logic_error(logic_error&&))
(logic_error::operator=(logic_error&&))
(runtime_error::runtime_error(runtime_error&&))
(runtime_error::operator=(runtime_error&&)): Copy strings instead of
moving, to avoid allocating empty reps for moved-from strings.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/src/c++11/cow-stdexcept.cc
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Subject: [Bug libstdc++/71641] 22_locale/time_get/get_date/wchar_t/4.cc runs failure if static linking
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to John David Anglin from comment #1)
> Fails on hppa-linux with libc 2.25:
Is that a Debian system too?
Maybe we can figure out a condition to use for dg-xfail-if or dg-skip-if.
>From gcc-bugs-return-612936-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 16:36:25 2018
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Subject: [Bug libstdc++/86590] Codegen is poor when passing std::string by value with _GLIBCXX_EXTERN_TEMPLATE undefined
Date: Thu, 16 Aug 2018 16:36:00 -0000
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--- Comment #30 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The thing is that even with the foo that doesn't contain all those
__builtin_constant_p 's after early inlining, we with -std=c++17 -O3 don't
inline for some reason _M_construct.constprop, while we do inline it with
-std=c++14.
With -std=c++14 -O3 we are considering inlining _M_construct.constprop 4 times,
into basic_string ctor twice and into foo twice, with -std=c++17 -O3 only 2
times, both into the ctor.
Richard or Honza, can you please find out why the inliner doesn't consider
inlining it into foo?
>From gcc-bugs-return-612937-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 16:46:48 2018
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Subject: [Bug middle-end/86968] Unaligned big-endian (scalar_storage_order) access on armv7-a yields 4 ldrb instructions rather than ldr+rev
Date: Thu, 16 Aug 2018 16:46:00 -0000
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--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Any unaligned access things that don't work for big-endian ARM are
probably fallout from the issues with big-endian NEON (NEON architectural
lane numbers are different from the architecture-independent lane numbers
in GNU C vector extensions and GCC IR, and GCC expects each machine mode
to have a single defined memory layout and a single defined layout in any
given register, and to be able to move between core and NEON registers,
and between core registers and memory, in the respective layouts used for
those registers, but some NEON loads and stores for big-endian don't work
with those expectations, so unaligned vector operations are limited for
big-endian ARM).
>From gcc-bugs-return-612938-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 16:53:47 2018
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Subject: [Bug target/86640] [8/9 regression] ICE in combine
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Tamar Christina <tnfchris at gcc dot gnu.org> changed:
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--- Comment #14 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Fixed in trunk and backported to GCC-8
>From gcc-bugs-return-612939-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 17:07:53 2018
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/70693] valgrind error in get_visual_column
Date: Thu, 16 Aug 2018 17:07:00 -0000
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--- Comment #10 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Author: dmalcolm
Date: Thu Aug 16 17:07:15 2018
New Revision: 263595
URL: https://gcc.gnu.org/viewcvs?rev=263595&root=gcc&view=rev
Log:
-Wmisleading-indentation: fix ICE in get_visual_column (PR c++/70693)
PR c++/70693 reports a crash within -Wmisleading-indentation in
get_visual_column, reading past the end of a source line.
The issue occurs due to a stray carriage return aka '\r' aka ^M, occurring
towards the end of line 35 of attachment 38289 - but not at the end itself.
This carriage return confuses our line numbering: from that point in the
file, the lexer (and thus location_t values) use line numbers that are
one larger than those seen by input.c, "cat -n" and emacs.
This discrepancy between the lexer's line numbering and input.c's line
numbering leads to an out-of-range read in get_visual_column (trying to
read column 8, to locate the first non-whitespace on the line containing
"break;", but finding the next line, which is only 4 characters long).
This patch fixes the ICE by adding a range check to get_visual_column
before accessing the input.c line buffer. This is arguably papering
over the root cause, but there are presumably other ways of triggering
such an out-of-range read by writing to the source file after the lexer
but before -Wmisleading-indentation, and we ought to be not ICE in the
face of that.
gcc/c-family/ChangeLog:
PR c++/70693
* c-common.c (selftest::c_family_tests): Call
selftest::c_indentation_c_tests.
* c-common.h (selftest::c_indentation_c_tests): New decl.
* c-indentation.c: Include "selftest.h".
(next_tab_stop): Add "tab_width" param, rather than accessing
cpp_opts.
(get_visual_column): Likewise. Clarify comment. Bulletproof
against reading past the end of the line.
(get_first_nws_vis_column): Add "tab_width" param.
(detect_intervening_unindent): Likewise.
(should_warn_for_misleading_indentation): Read tab width from
cpp_opts and pass around.
(selftest::test_next_tab_stop): New test.
(selftest::assert_get_visual_column_succeeds): New function.
(ASSERT_GET_VISUAL_COLUMN_SUCCEEDS): New macro.
(selftest::assert_get_visual_column_fails): New function.
(ASSERT_GET_VISUAL_COLUMN_FAILS): New macro.
(selftest::test_get_visual_column): New test.
(selftest::c_indentation_c_tests): New function.
gcc/testsuite/ChangeLog:
PR c++/70693
* c-c++-common/Wmisleading-indentation-pr70693.c: New test.
Added:
trunk/gcc/testsuite/c-c++-common/Wmisleading-indentation-pr70693.c
Modified:
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c-common.c
trunk/gcc/c-family/c-common.h
trunk/gcc/c-family/c-indentation.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-612941-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 17:14:49 2018
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Subject: [Bug c/86972] [6/7/8/9 Regression] Incorrect array-bounds warning with -O2 when creating pointer from array
Date: Thu, 16 Aug 2018 17:14:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |msebor at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
The result of pointer addition or subtraction must point at an existing element
of an array or just past the last one, otherwise the behavior is undefined.
In the test case in comment #0 the subtraction doesn't satisfy this requirement
and the warning correctly points that out. What makes you think otherwise?
>From gcc-bugs-return-612940-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 17:14:30 2018
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Subject: [Bug c++/86911] [9 Regression] ICE in gcc/c-family/c-indentation.c:403
Date: Thu, 16 Aug 2018 17:14:00 -0000
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--- Comment #3 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Does r263595 fix the issue? (it relates to having stray carriage returns
somewhere above in the file, leading to line-numbering becoming confused)
>From gcc-bugs-return-612942-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 17:40:18 2018
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From: "dave.anglin at bell dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/71641] 22_locale/time_get/get_date/wchar_t/4.cc runs failure if static linking
Date: Thu, 16 Aug 2018 17:40:00 -0000
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--- Comment #4 from dave.anglin at bell dot net ---
On 2018-08-16 12:26 PM, redi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71641
>
> --- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
> (In reply to John David Anglin from comment #1)
>> Fails on hppa-linux with libc 2.25:
> Is that a Debian system too?
Yes. Currently, running Debian sid/unstable with glibc 2.27.
Some people run Gentoo. Don't know if Gentoo is affected.
>From gcc-bugs-return-612943-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 18:06:22 2018
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Subject: [Bug c++/86980] Lambda function with return type rvalue reference dtor issue
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--- Comment #2 from Neeraj <neeraj.sharma at alumni dot iitg.ernet.in> ---
(In reply to Jonathan Wakely from comment #1)
> This is a bug in your code, not GCC. you're returning a reference to a local
> variable, which goes out of scope, leaving a dangling reference.
>
I was just playing with alternatives, hence tried return rvalue reference. The
larger question still remains, which is what is the return type in case of the
following?
auto f = []() {
Traceable tmp;
return std::move(tmp);
};
Traceable a = f();
Additionally, the above code retains the instance till the move is complete
(see the console output below).
// ---
[MoveReturn] START
[0x7ffe53dec857] ctor Traceable
[0x7ffe53dec887] move ctor Traceable, &other = 0x7ffe53dec857
[0x7ffe53dec857] dtor Traceable
[0x7ffe53dec887] dtor Traceable
// x--
> When you don't give the lambda an explicit return type it returns by value,
> so works correctly.
>
> You should just do:
>
> auto f = []() {
> Traceable tmp;
> return tmp;
> };
>
> This returns by value and can elide the move, so is safer and faster.
I agree, but just curious to see possibilities with lambda function :)
>From gcc-bugs-return-612944-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 18:23:48 2018
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Subject: [Bug libstdc++/71641] 22_locale/time_get/get_date/wchar_t/4.cc runs failure if static linking
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--- Comment #5 from dave.anglin at bell dot net ---
On 2018-08-16 7:35 AM, redi at gcc dot gnu.org wrote:
> So this is not a libstdc++ bug, it's a glibc bug. Debian's glibc 2.13 has bad
> locale data for zh_TW, and all versions of glibc have the static linking bug.
I vaguely recall that that this is a "political" issue.
Dave
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Subject: [Bug target/86745] [9 regression] gcc.target/i386/avx-cvt-2.c etc. FAIL on 64-bit x86
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--- Comment #4 from uros at gcc dot gnu.org ---
Author: uros
Date: Thu Aug 16 18:52:26 2018
New Revision: 263598
URL: https://gcc.gnu.org/viewcvs?rev=263598&root=gcc&view=rev
Log:
PR testsuite/86745
* gcc.target/i386/avx-cvt-2.c: Loosen scan-assembler strings.
* gcc.target/i386/avx-cvt-2.c: Ditto.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/i386/avx-cvt-2.c
trunk/gcc/testsuite/gcc.target/i386/avx2-cvt-2.c
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Uroš Bizjak <ubizjak at gmail dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
Fixed.
>From gcc-bugs-return-612947-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 19:18:48 2018
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Subject: [Bug libstdc++/31413] FAIL: 22_locale/time_get/get_date/wchar_t/4.cc execution test
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--- Comment #25 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The test is disabled unless the machine actually has the relevant locale
installed:
// { dg-require-namedlocale "zh_TW.UTF-8" }
That will be why some systems show UNSUPPORTED.
>From gcc-bugs-return-612948-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 19:21:09 2018
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Subject: [Bug libstdc++/71641] 22_locale/time_get/get_date/wchar_t/4.cc runs failure if static linking
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=31413
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, Debian carries a patch for glibc: localedata/locale-zh_TW.diff
That has a comment referring to
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=352600 which has a comment
from one John David Anglin linking to our own PR 31413 :-)
So since this bug is specifically about static linking (which is a glibc bug)
I'll move the discussion of the Debian FAIL back to PR 31413.
>From gcc-bugs-return-612950-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 19:22:37 2018
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Subject: [Bug libstdc++/31413] FAIL: 22_locale/time_get/get_date/wchar_t/4.cc execution test
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--- Comment #26 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This still fails on any Debian system, such as gcc20 in the compile farm. I'd
like to either make it pass, or add dg-xfail-if or dg-skip-if to the test.
Paolo, do you remember if this testcase was specifically testing the zh_TW
locale, or just sing that as an example of a locale using wide characters?
Maybe we can change it to a different locale that still tests the same code,
but using a locale that has consistent localedata across distros?
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Subject: [Bug testsuite/86519] [9 Regression] New test case gcc.dg/strcmpopt_6.c fails with its introduction in r262636
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Rainer Orth <ro at gcc dot gnu.org> changed:
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CC| |ro at gcc dot gnu.org
--- Comment #18 from Rainer Orth <ro at gcc dot gnu.org> ---
(In reply to qinzhao from comment #17)
> the patch has been committed as:
>
> https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=263563
The commit message lacked the ChangeLog entry fragment and didns't otherwise
contain the reference to PR testsuite/86519, so bugzilla didn't pick it up.
What's worse, the patch caused the testcase to regress on 32-bit sparc:
+FAIL: gcc.dg/strcmpopt_6.c scan-assembler-times memcmp 2
The file has
sethi %hi(memcmp), %g1
jmp %g1 + %lo(memcmp)
sethi %hi(memcmp), %g1
jmp %g1 + %lo(memcmp)
while for sparcv9 there's only:
call memcmp, 0
call memcmp, 0
Seems scan-assembler-times isn't reliable here.
Rainer
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Subject: [Bug c/86983] New: documentation inconsistent with always_inline diagnostics for computed goto
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Reporter: richard-gccbugzilla at metafoo dot co.uk
Target Milestone: ---
Per https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html a function
containing a computed goto can be inlined (so long as no label within it is
used to initialize a static variable):
> The &&foo expressions for the same label might have different values if the containing function is inlined or cloned. If a program relies on them being always the same, __attribute__((__noinline__,__noclone__)) should be used to prevent inlining and cloning. If &&foo is used in a static variable initializer, inlining and cloning is forbidden.
However, applying __attribute__((__always_inline__)) to a function containing a
computed goto produces this diagnostic:
> error: function 'void* f(void*)' can never be inlined because it contains a computed goto
... which claims that a computed goto prevents inlining. (See
https://godbolt.org/g/XFhwQq)
Also, GCC warns on returning the address of a label from a function, which
makes sense if different invocations of the same function can have different
addresses for their labels (through inlining / cloning), but is a false
positive on an example such as the one at that godbolt.org link otherwise.
So, which is it?
Is GCC reserving the right to inline functions containing computed gotos in
some future version? (In which case, the always_inline diagnostic is somewhere
between misleading and wrong, and should probably be weakened from "can never
be inlined" to something like "was not inlined".)
Or has the computed goto rule been changed to "functions containing computed
goto will never be inlined or cloned"? (In which case the documentation is
wrong, and the warning on returning the address of a label seems questionable,
at least for an enabled-by-default warning, since it warns on reasonable code
and there doesn't seem to be a simple syntactic way to suppress the warning.)
>From gcc-bugs-return-612952-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 19:56:04 2018
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From: "willschm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86592] [9 regression] gcc.target/powerpc/p8-vec-xl-xst-v2.c fails starting with r261510
Date: Thu, 16 Aug 2018 19:56:00 -0000
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--- Comment #1 from Will Schmidt <willschm at gcc dot gnu.org> ---
This should have cleared up once the gimple-folding support for unaligned loads
and stores went in, and the instruction counts settled on the expected values.
commit c16f12a2dc14256226e85a9a9f82b54eb1de2187
Author: willschm <willschm@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon Aug 13 18:13:20 2018 +0000
I'll keep an eye on this space to make sure.
thanks,
>From gcc-bugs-return-612953-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 20:18:57 2018
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Subject: [Bug tree-optimization/78257] missing memcmp optimization with constant arrays
Date: Thu, 16 Aug 2018 20:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78257
--- Comment #8 from Martin Sebor <msebor at gcc dot gnu.org> ---
With r263561 brace-enclosed initializers for constant character arrays are
handled by transforming them into STRING_CSTs. It should be possible to also
handle wide character types (wchar_t, char16_t, char32_t). Handling arrays of
arbitrary integers will probably take a different approach.
>From gcc-bugs-return-612954-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 20:41:08 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/59847] cast to long makes compiler crash if using option pdp-11/10
Date: Thu, 16 Aug 2018 20:41:00 -0000
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Patrick Conlon <cptjustice at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |cptjustice at gmail dot com
--- Comment #1 from Patrick Conlon <cptjustice at gmail dot com> ---
On gcc 9.0.0 20180808 (experimental) this code no longer give this error.
pdp11-aout-gcc no longer produces the sxt instruction with the -m10 option, but
still does for -m40 as it should.
cptnapalm@oracle~/s/p/p/g/59847_cast_to_long_m10> pdp11-aout-gcc -v
Using built-in specs.
COLLECT_GCC=pdp11-aout-gcc
COLLECT_LTO_WRAPPER=/home/cptnapalm/opt/pdp11-aout/libexec/gcc/pdp11-aout/9.0.0/lto-wrapper
Target: pdp11-aout
Configured with: /home/cptnapalm/src/gnu/gcc/configure --target=pdp11-aout
--prefix=/home/cptnapalm/opt/pdp11-aout --disable-libstdcxx --disable-nls
--without-headers --enable-languages=c : (reconfigured)
/home/cptnapalm/src/gnu/gcc/configure --target=pdp11-aout
--prefix=/home/cptnapalm/opt/pdp11-aout --disable-libstdcxx --disable-nls
--without-headers --enable-languages=c --disable-libssp : (reconfigured)
/home/cptnapalm/src/gnu/gcc/configure --target=pdp11-aout
--prefix=/home/cptnapalm/opt/pdp11-aout --disable-libstdcxx --disable-nls
--without-headers --enable-languages=c --disable-libssp20180808 (experimental)
Thread model: single
gcc version 9.0.0 20180808 (experimental) (GCC)
cptnapalm@oracle~/s/p/p/g/59847_cast_to_long_m10> pdp11-aout-gcc -m10 -S -o
cast_to_long_m10.s cast_to_long_m10.c
cast_to_long_m10.c:1:1: warning: return type defaults to 'int' [-Wimplicit-int]
test ()
^~~~
cptnapalm@oracle~/s/p/p/g/59847_cast_to_long_m10> cat cast_to_long_m10.s
.text
.even
.globl _test
_test:
mov r5,-(sp)
mov sp,r5
add $-06,sp
mov r2,-(sp)
clr -04(r5)
mov $012,-02(r5)
mov $012,-06(r5)
mov -06(r5),r0
mov r0,-02(r5)
mov r0,r1
mov $017,r2
mov r0,r1
L_3:
asr r1
dec r2
bne L_3
mov r1,-04(r5)
nop
mov (sp)+,r2
mov r5,sp
mov (sp)+,r5
rts pc
cptnapalm@oracle~/s/p/p/g/59847_cast_to_long_m10> pdp11-aout-gcc -m40 -S -o
cast_to_long_m40.s cast_to_long_m10.c
cast_to_long_m10.c:1:1: warning: return type defaults to 'int' [-Wimplicit-int]
test ()
^~~~
cptnapalm@oracle~/s/p/p/g/59847_cast_to_long_m10> cat cast_to_long_m40.s
.text
.even
.globl _test
_test:
mov r5,-(sp)
mov sp,r5
add $-06,sp
clr -04(r5)
mov $012,-02(r5)
mov $012,-06(r5)
mov -06(r5),-02(r5)
sxt -04(r5)
nop
mov r5,sp
mov (sp)+,r5
rts pc
cptnapalm@oracle~/s/p/p/g/59847_cast_to_long_m10> cat cast_to_long_m10.c
test ()
{
long a = 10;
short b = 10;
a = (long) b;
}
>From gcc-bugs-return-612955-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 20:51:59 2018
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Subject: [Bug rtl-optimization/59942] pdp11-aout-gcc: PDP-11/10 code generation crashes when trying to do multiple shifts.
Date: Thu, 16 Aug 2018 20:51:00 -0000
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Patrick Conlon <cptjustice at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |cptjustice at gmail dot com
--- Comment #1 from Patrick Conlon <cptjustice at gmail dot com> ---
gcc version 9.0.0 20180808 (experimental) (GCC) no longer produces this
compiler error.
Output of pdp11-aout-gcc -m10... :
.text
.even
.globl _main
_main:
mov r5,-(sp)
mov sp,r5
add $-04,sp
jsr pc,___main
mov $023420,-02(r5)
mov -02(r5),r0
mov $011,r1
mov -02(r5),r0
L_5:
asr r0
dec r1
bne L_5
mov r0,-04(r5)
clr r0
mov r5,sp
mov (sp)+,r5
rts pc
Output of -m40 option:
.text
.even
.globl _main
_main:
mov r5,-(sp)
mov sp,r5
add $-04,sp
jsr pc,___main
mov $023420,-02(r5)
mov -02(r5),r0
ash $-011,r0
mov r0,-04(r5)
clr r0
mov r5,sp
mov (sp)+,r5
rts pc
>From gcc-bugs-return-612956-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 21:03:13 2018
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From: "cptjustice at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84437] long long casting breaks PDP-11 with -m10 model option (includes trivial reproducer)
Date: Thu, 16 Aug 2018 21:03:00 -0000
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Patrick Conlon <cptjustice at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |cptjustice at gmail dot com
--- Comment #1 from Patrick Conlon <cptjustice at gmail dot com> ---
gcc version 9.0.0 20180808 (experimental) (GCC) no longer produces this
compiler error. Below is the output I got:
cptnapalm@oracle~/s/p/p/g/84437 > cat long_long_m10.s
.text
.even
.globl _x
_x:
mov r5,-(sp)
mov sp,r5
add $-014,sp
mov r2,-(sp)
mov r3,-(sp)
mov r4,-(sp)
mov 06(r5),r0
mov r0,-02(r5)
mov -02(r5),r4
mov r4,-06(r5)
mov -02(r5),r4
mov $017,r0
mov r0,-04(r5)
mov -02(r5),r4
mov -04(r5),r0
L_4:
asr r4
dec r0
bne L_4
mov r4,-010(r5)
mov r4,-012(r5)
mov r4,-014(r5)
mov 04(r5),r4
mov -014(r5),(r4)
mov -012(r5),02(r4)
mov -010(r5),04(r4)
mov -06(r5),06(r4)
mov 04(r5),r0
mov (sp)+,r4
mov (sp)+,r3
mov (sp)+,r2
mov r5,sp
mov (sp)+,r5
rts pc
>From gcc-bugs-return-612957-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 21:08:53 2018
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From: "cptjustice at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84438] Another code pattern that breaks PDP11 with -m10: including reproducer code
Date: Thu, 16 Aug 2018 21:08:00 -0000
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Patrick Conlon <cptjustice at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |cptjustice at gmail dot com
--- Comment #1 from Patrick Conlon <cptjustice at gmail dot com> ---
gcc version 9.0.0 20180808 (experimental) (GCC) does not give me this compiler
error. pdp11-aout-gcc -m10 -S 43447_divide_tp_by_10_return_remainder.c -o
43447_divide_tp_by_10_return_remainder.s outputs:
cat 43447_divide_tp_by_10_return_remainder.s
.text
.even
_div10quickm:
mov r5,-(sp)
mov sp,r5
add $-020,sp
mov r2,-(sp)
mov r3,-(sp)
mov 04(r5),r0
mov (r0),-04(r5)
mov 02(r0),-02(r5)
mov -04(r5),r0
mov -02(r5),r1
clc
ror r0
ror r1
mov r0,-020(r5)
mov r1,-016(r5)
mov -04(r5),r0
mov -02(r5),r1
clc
ror r0
ror r1
asr r0
ror r1
mov -020(r5),r2
mov -016(r5),r3
add r0,r2
add r1,r3
adc r2
mov r2,-010(r5)
mov r3,-06(r5)
mov -010(r5),r0
mov -06(r5),r1
mov $04,r2
mov -010(r5),r0
mov -06(r5),r1
L_7:
clc
ror r0
ror r1
dec r2
bne L_7
add r0,-010(r5)
add r1,-06(r5)
adc -010(r5)
mov -010(r5),r0
mov -06(r5),r1
mov $010,r2
mov -010(r5),r0
mov -06(r5),r1
L_8:
clc
ror r0
ror r1
dec r2
bne L_8
add r0,-010(r5)
add r1,-06(r5)
adc -010(r5)
mov -010(r5),r0
mov -06(r5),r1
mov $020,r2
mov -010(r5),r0
mov -06(r5),r1
L_9:
clc
ror r0
ror r1
dec r2
bne L_9
add r0,-010(r5)
add r1,-06(r5)
adc -010(r5)
clc
ror -010(r5)
ror -06(r5)
asr -010(r5)
ror -06(r5)
asr -010(r5)
ror -06(r5)
mov -010(r5),r0
mov -06(r5),r1
asl r1
rol r0
asl r1
rol r0
add -010(r5),r0
add -06(r5),r1
adc r0
asl r1
rol r0
mov -04(r5),r2
mov -02(r5),r3
sub r0,r2
sub r1,r3
sbc r2
mov r2,-014(r5)
mov r3,-012(r5)
mov -014(r5),r0
mov -012(r5),r1
mov $011,r2
mov -014(r5),r0
mov -012(r5),r1
L_10:
clc
ror r0
ror r1
dec r2
bne L_10
mov -010(r5),r2
mov -06(r5),r3
add r0,r2
add r1,r3
adc r2
mov r2,-04(r5)
mov r3,-02(r5)
mov 04(r5),r0
mov -04(r5),(r0)
mov -02(r5),02(r0)
asl -02(r5)
rol -04(r5)
mov -04(r5),r0
mov -02(r5),r1
asl r1
rol r0
asl r1
rol r0
add r0,-04(r5)
add r1,-02(r5)
adc -04(r5)
mov 04(r5),r0
mov (r0),r0
mov 02(r0),r1
sub -04(r5),r0
sub -02(r5),r1
sbc r0
mov (sp)+,r3
mov (sp)+,r2
mov r5,sp
mov (sp)+,r5
rts pc
cptnapalm@oracle~/s/p/p/g/84438_alan_cox> pdp11-aout-gcc -v
Using built-in specs.
COLLECT_GCC=pdp11-aout-gcc
COLLECT_LTO_WRAPPER=/home/cptnapalm/opt/pdp11-aout/libexec/gcc/pdp11-aout/9.0.0/lto-wrapper
Target: pdp11-aout
Configured with: /home/cptnapalm/src/gnu/gcc/configure --target=pdp11-aout
--prefix=/home/cptnapalm/opt/pdp11-aout --disable-libstdcxx --disable-nls
--without-headers --enable-languages=c : (reconfigured)
/home/cptnapalm/src/gnu/gcc/configure --target=pdp11-aout
--prefix=/home/cptnapalm/opt/pdp11-aout --disable-libstdcxx --disable-nls
--without-headers --enable-languages=c --disable-libssp : (reconfigured)
/home/cptnapalm/src/gnu/gcc/configure --target=pdp11-aout
--prefix=/home/cptnapalm/opt/pdp11-aout --disable-libstdcxx --disable-nls
--without-headers --enable-languages=c --disable-libssp
Thread model: single
gcc version 9.0.0 20180808 (experimental) (GCC)
>From gcc-bugs-return-612958-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 21:56:10 2018
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Subject: [Bug c++/86094] [8/9 Regression] Call ABI changed for small objects with defaulted ctor
Date: Thu, 16 Aug 2018 21:56:00 -0000
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Azat <a3at.mail at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |a3at.mail at gmail dot com
--- Comment #12 from Azat <a3at.mail at gmail dot com> ---
Shouldn't such case also be warned by `g++ -Wabi=12` ?
struct noncopyable
{
public:
noncopyable(noncopyable &&) = default;
};
struct S : public noncopyable
{
int i;
};
void foo(S s) {}
>From gcc-bugs-return-612959-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 22:32:55 2018
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From: "virkony at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/67906] Missing warning about std::move without effect
Date: Thu, 16 Aug 2018 22:32:00 -0000
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--- Comment #9 from Nikolay Orliuk <virkony at gmail dot com> ---
Yes. Return value optimization blocked by abusing std::move also close. Somehow
I had feeling that I saw something similar from gcc in pre-C++11 times.
Regarding sample:
struct X {
X() { }
X(const X&) { }
X(const X&&) { }
};
const X x;
const X y = std::move(x);
It shouldn't warn because std::move is effective here and makes choice between
default (const X&) and (const X&&) overloads. I.e. we are not ignoring the fact
that it is rvalue.
As I stated initially I agree that most likely templates will cause false
triggering. Like for other warnings (ex. -Wduplicated-branches ).
The main point here was to identify places that potentially migrated
incompletely. Kinda temporary flag.
Trigger rule might be: cast to rvalue for overloads one of which have slightly
different qualifiers combinations (e.g. const vs non-const).
That should a bit reduce chances of false trigerring compared to "whenever we
ignore rvalue".
If someone will want more noise they can request adding -Wsuggest-move-overload
to supported flags :)
>From gcc-bugs-return-612960-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 23:11:03 2018
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Subject: [Bug target/86984] New: invalid relocation accessing a const char arrray
Date: Thu, 16 Aug 2018 23:11:00 -0000
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Bug ID: 86984
Summary: invalid relocation accessing a const char arrray
Product: gcc
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As discussed here https://gcc.gnu.org/ml/gcc-patches/2018-08/msg00839.html, the
Alpha back end seems to emit invalid relocations for accesses to constant
arrays in some cases, causing Glibc build failures. This must have been latent
a bug that was triggered by the transformation of braced array initializers to
STRING_CSTs in r263511 as the same issue can be reproduced by replacing the
initializer with a string literal in the test case.
>From gcc-bugs-return-612961-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 16 23:14:14 2018
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Subject: [Bug target/86984] invalid relocation accessing a const char arrray
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--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Created attachment 44552
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44552&action=edit
Reduced test case.
Compiling the attached test case shows the invalid offsets in the assembly:
$ gcc -S -O2 -Wall -Wwrite-strings -Werror -fmerge-all-constants
-fno-stack-protector -mieee plural.c -o/dev/stdout | grep gprelhigh
ldah $1,yypgoto+2305843009213693936($29) !gprelhigh
ldah $1,yypact($29) !gprelhigh
ldah $1,yytable($29) !gprelhigh
ldah $1,yydefact($29) !gprelhigh
ldah $2,yyr2($29) !gprelhigh
ldah $15,yyr1($29) !gprelhigh
ldah $1,yypgoto($29) !gprelhigh
ldah $5,yycheck($29) !gprelhigh
ldah $1,yydefgoto($29) !gprelhigh
ldah $2,yypgoto+2305843009213693936($29) !gprelhigh
ldah $2,yytable($29) !gprelhigh
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Subject: [Bug target/86984] invalid relocation accessing a const char arrray
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--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
The excessive offset appears in the first RTL dump:
$ grep -A3 -B3 2305843009213693936 plural.c.230r.expand
(insn 87 86 88 10 (set (reg:DI 154)
(lshiftrt:DI (reg:DI 155)
(const_int 3 [0x3]))) -1
(expr_list:REG_EQUAL (const_int 2305843009213693936 [0x1ffffffffffffff0])
(nil)))
(insn 88 87 89 10 (set (reg/f:DI 152)
(plus:DI (reg:DI 153)
>From gcc-bugs-return-612963-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 00:11:06 2018
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Subject: [Bug fortran/84539] ICE and segfault with assignment to CLASS(*) array
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--- Comment #4 from Neil Carlson <neil.n.carlson at gmail dot com> ---
Update with 8.2.0
The ICE is gone, but a run time segfault remains:
Program received signal SIGSEGV: Segmentation fault - invalid memory reference.
Backtrace for this error:
#0 0x7f82986c06df in ???
#1 0x400754 in MAIN__
at gfortran-20180223a.f90:2
#2 0x400979 in main
at gfortran-20180223a.f90:7
Segmentation fault (core dumped)
>From gcc-bugs-return-612964-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 01:56:17 2018
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Subject: [Bug c++/86980] Lambda function with return type rvalue reference dtor issue
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--- Comment #3 from Neeraj <neeraj.sharma at alumni dot iitg.ernet.in> ---
Ah! Alright so the following two code snippets are equivalent.
// --
auto f = []() {
Traceable tmp;
return std::move(tmp);
};
// ---
auto f = []() -> Traceable {
Traceable tmp;
return std::move(tmp);
};
// x--
>From gcc-bugs-return-612965-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 02:56:37 2018
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Subject: [Bug c++/16166] -Weffc++ finer granularity
Date: Fri, 17 Aug 2018 02:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16166
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
--- Comment #13 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #12)
> Created attachment 43443 [details]
> Patch to split -Weffc++ into separate options.
>
> This adds several new warning options to replace -Weffc++, and makes
> -Weffc++ enable them all.
Right I've been meaning to try this patch but couldn't, due to having been
blocked from bootstrapping for a while by bug 82092... it looks like that one
might be getting fixed around now though, so once I've verified that, I'll try
this...
>From gcc-bugs-return-612966-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 04:02:00 2018
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Subject: [Bug tree-optimization/86853] sprintf optimization for wide strings doesn't account for conversion failure
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--- Comment #2 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Fri Aug 17 04:01:14 2018
New Revision: 263612
URL: https://gcc.gnu.org/viewcvs?rev=263612&root=gcc&view=rev
Log:
gcc/ChangeLog:
PR tree-optimization/86853
* gimple-ssa-sprintf.c (struct format_result): Rename member.
(struct fmtresult): Add member and initialize it in ctors.
(format_character): Handle %C. Extend range to NUL. Set MAYFAIL.
(format_string): Handle %S the same as %ls. Set MAYFAIL.
(format_directive): Set POSUNDER4K when MAYFAIL is set.
(parse_directive): Handle %C same as %c.
(sprintf_dom_walker::compute_format_length): Adjust.
(is_call_safe): Adjust.
gcc/testsuite/ChangeLog:
PR tree-optimization/86853
* gcc.dg/tree-ssa/builtin-sprintf-10.c: New test.
* gcc.dg/tree-ssa/builtin-sprintf-11.c: New test.
* gcc.dg/tree-ssa/builtin-sprintf-warn-18.c: Adjust.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-10.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-11.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/gimple-ssa-sprintf.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-18.c
>From gcc-bugs-return-612967-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 04:20:18 2018
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Subject: [Bug debug/86985] New: https://gcc.gnu.org/bugzilla/enter_bug.cgi?product=gcc
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It is currently impossible for a debugger to distinguish between a zero-length
and a flexible array given the debug info generated by GCC:
$ cat zero_length.c
struct {
int foo;
int bar[0];
} baz;
$ cat flexible.c
struct {
int foo;
int bar[];
} baz;
$ gcc -g -c zero_length.c
$ gcc -g -c flexible.c
$ gdb -batch -ex 'ptype baz' zero_length.o
type = struct {
int foo;
int bar[];
}
$ gdb -batch -ex 'ptype baz' flexible.o
type = struct {
int foo;
int bar[];
}
However, when compiling with clang:
$ clang -g -c zero_length.c
$ clang -g -c flexible.c
$ gdb -batch -ex 'ptype baz' zero_length.o
type = struct {
int foo;
int bar[0];
}
$ gdb -batch -ex 'ptype baz' flexible.o
type = struct {
int foo;
int bar[];
}
This distinction would be useful for certain tools. For example, I have a tool
which feeds the structure definitions from debug info back into a C compiler,
but this fails in some cases where zero-length and flexible array types are not
interchangable.
>From gcc-bugs-return-612968-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 04:30:51 2018
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Subject: [Bug c++/86986] New: Unexpected errors for template parameter pack in a template template parameter
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Bug ID: 86986
Summary: Unexpected errors for template parameter pack in a
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/************* SOURCE *************/
template<class... T>
struct X {
template<template<T...> class...>
struct Y { };
};
using type = X<int>::Y<>;
/*********** END SOURCE ***********/
/************* OUTPUT *************/
<source>: In instantiation of 'struct X<int>':
<source>:7:20: required from here
<source>:4:12: error: '<template-parameter-1-1>' is not a valid type for a
template non-type parameter
4 | struct Y { };
| ^
<source>:4:12: error: '<template-parameter-1-1>' is not a valid type for a
template non-type parameter
<source>:7:22: error: 'Y' in 'struct X<int>' does not name a template type
7 | using type = X<int>::Y<>;
| ^
Compiler returned: 1
/*********** END OUTPUT ***********/
Clang compiles this code successfully
>From gcc-bugs-return-612969-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 04:41:04 2018
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Subject: [Bug debug/86985] Generated DWARF does not distinguish between zero-length and flexible array types
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--- Comment #1 from Omar Sandoval <osandov at osandov dot com> ---
Posted a patch here: https://gcc.gnu.org/ml/gcc-patches/2018-08/msg00994.html.
>From gcc-bugs-return-612970-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 05:16:40 2018
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Subject: [Bug debug/86985] Generated DWARF does not distinguish between zero-length and flexible array types
Date: Fri, 17 Aug 2018 05:16:00 -0000
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Considering GCC considers zero length array as the same as flexible array
types, I don't think this is really an issue.
>this fails in some cases where zero-length and flexible array types are not
interchangable.
There should never be a possiblity of this anyways.
NOTE zero-length array types are a GCC extension anyways.
>From gcc-bugs-return-612971-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 05:26:10 2018
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Subject: [Bug debug/86985] Generated DWARF does not distinguish between zero-length and flexible array types
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--- Comment #3 from Omar Sandoval <osandov at osandov dot com> ---
They are not equivalent in GCC, see
https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html. In particular, flexible
arrays cannot be the only member in a struct, cannot be a member of a union,
cannot be used as a dimension of a multidimensional array, and can have a
static initializer with elements; the opposite is true for zero length arrays.
>From gcc-bugs-return-612972-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 06:32:54 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug hsa/86948] Internal compiler error compiling brig.dg/test/gimple/mulhi.hsail
Date: Fri, 17 Aug 2018 06:32:00 -0000
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--- Comment #5 from Pekka Jääskeläinen <pekka.jaaskelainen at parmance dot com> ---
Hi Alexander. I just verified that the patch fixes the make check-brig
regression here. Are you going to post this to ML for review or how shall we
proceed?
>From gcc-bugs-return-612973-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 07:16:46 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86987] New: ICE in simplify_binary_operation_1, at simplify-rtx.c:3515 on ppc64le
Date: Fri, 17 Aug 2018 07:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86987
Bug ID: 86987
Summary: ICE in simplify_binary_operation_1, at
simplify-rtx.c:3515 on ppc64le
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: segher at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-linux-gnu
Target: ppc64le-linux-gnu
Following ICEs:
$ powerpc64le-suse-linux-gcc
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/fold-vec-splat-short.c
-O -mno-optimize-swaps -c -S
during RTL pass: fwprop1
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/fold-vec-splat-short.c:
In function 'test_obs':
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/fold-vec-splat-short.c:44:1:
internal compiler error: in simplify_binary_operation_1, at simplify-rtx.c:3643
vector bool short test_obs () { const vector bool short y = {1, 2, 3, 4, 5, 6,
7, 8}; return vec_splat (y, 0b10010); }
^~~~~~
0x7ffff69affea __libc_start_main
../csu/libc-start.c:308
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://bugs.opensuse.org/> for instructions.
>From gcc-bugs-return-612974-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 07:28:56 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/86988] New: [7/9 Regression] ICE: tree check: expected integer_cst, have var_decl in get_len, at tree.h:5563
Date: Fri, 17 Aug 2018 07:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86988
Bug ID: 86988
Summary: [7/9 Regression] ICE: tree check: expected
integer_cst, have var_decl in get_len, at tree.h:5563
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: jason at gcc dot gnu.org, msebor at gcc dot gnu.org
Target Milestone: ---
Starting from r246662 we ICE on:
$ gcc /home/marxin/Programming/gcc/gcc/testsuite/g++.dg/ext/vla19.C
-Warray-bounds -O2 -c
during GIMPLE pass: vrp
/home/marxin/Programming/gcc/gcc/testsuite/g++.dg/ext/vla19.C: In function
‘void foo()’:
/home/marxin/Programming/gcc/gcc/testsuite/g++.dg/ext/vla19.C:8:1: internal
compiler error: tree check: expected integer_cst, have var_decl in get_len, at
tree.h:5563
8 | foo ()
| ^~~
0x7870e4 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
/home/marxin/Programming/gcc/gcc/tree.c:9351
0x1153cd7 tree_check(tree_node const*, char const*, int, char const*,
tree_code)
/home/marxin/Programming/gcc/gcc/tree.h:3376
0x1153cd7 wi::extended_tree<128>::get_len() const
/home/marxin/Programming/gcc/gcc/tree.h:5563
0x1153cd7 wi::int_traits<generic_wide_int<wi::extended_tree<128> >
>::decompose(long*, unsigned int, generic_wide_int<wi::extended_tree<128> >
const&)
/home/marxin/Programming/gcc/gcc/wide-int.h:964
0x1153cd7 wide_int_ref_storage<true,
false>::wide_int_ref_storage<generic_wide_int<wi::extended_tree<128> >
>(generic_wide_int<wi::extended_tree<128> > const&, unsigned int)
/home/marxin/Programming/gcc/gcc/wide-int.h:1013
0x1153cd7 generic_wide_int<wide_int_ref_storage<true, false>
>::generic_wide_int<generic_wide_int<wi::extended_tree<128> >
>(generic_wide_int<wi::extended_tree<128> > const&, unsigned int)
/home/marxin/Programming/gcc/gcc/wide-int.h:788
0x1153cd7 wi::binary_traits<generic_wide_int<wi::extended_tree<128> >, int,
wi::int_traits<generic_wide_int<wi::extended_tree<128> > >::precision_type,
wi::int_traits<int>::precision_type>::result_type
wi::add<generic_wide_int<wi::extended_tree<128> >,
int>(generic_wide_int<wi::extended_tree<128> > const&, int const&)
/home/marxin/Programming/gcc/gcc/wide-int.h:2402
0x1146a85 wi::binary_traits<generic_wide_int<wi::extended_tree<128> >, int,
wi::int_traits<generic_wide_int<wi::extended_tree<128> > >::precision_type,
wi::int_traits<int>::precision_type>::operator_result
operator+<generic_wide_int<wi::extended_tree<128> >,
int>(generic_wide_int<wi::extended_tree<128> > const&, int const&)
/home/marxin/Programming/gcc/gcc/wide-int.h:3273
0x1146a85 vrp_prop::check_mem_ref(unsigned int, tree_node*, bool)
/home/marxin/Programming/gcc/gcc/tree-vrp.c:4690
0x1146cd9 check_array_bounds
/home/marxin/Programming/gcc/gcc/tree-vrp.c:4897
0x117486b walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, default_hash_traits<tree_node*> >*, tree_node*
(*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*,
hash_set<tree_node*, default_hash_traits<tree_node*> >*))
/home/marxin/Programming/gcc/gcc/tree.c:11484
0xc6e850 walk_gimple_op(gimple*, tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
/home/marxin/Programming/gcc/gcc/gimple-walk.c:202
0x113e5f1 check_array_bounds_dom_walker::before_dom_children(basic_block_def*)
/home/marxin/Programming/gcc/gcc/tree-vrp.c:4950
0x1677567 dom_walker::walk(basic_block_def*)
/home/marxin/Programming/gcc/gcc/domwalk.c:353
0x114235c vrp_prop::check_all_array_refs()
/home/marxin/Programming/gcc/gcc/tree-vrp.c:4967
0x1143e52 vrp_prop::vrp_finalize(bool)
/home/marxin/Programming/gcc/gcc/tree-vrp.c:6743
0x1151e6e execute_vrp
/home/marxin/Programming/gcc/gcc/tree-vrp.c:6816
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
GCC 8 branch is fine, it again appeared in r263511.
>From gcc-bugs-return-612975-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 07:39:44 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86989] New: ICE in rs6000_output_addr_const_extra, at config/rs6000/rs6000.c:20994
Date: Fri, 17 Aug 2018 07:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86989
Bug ID: 86989
Summary: ICE in rs6000_output_addr_const_extra, at
config/rs6000/rs6000.c:20994
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: segher at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-linux-gnu
Target: ppc64le-linux-gnu
Following causes ICE:
$ ./xgcc -B.
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/pr82337.c
-fno-rerun-cse-after-loop -mminimal-toc -Os
during RTL pass: final
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/pr82337.c: In
function ‘g’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/pr82337.c:27:1:
internal compiler error: in rs6000_output_addr_const_extra, at
config/rs6000/rs6000.c:20994
27 | }
| ^
0x14d9c69 rs6000_output_addr_const_extra
/home/marxin/Programming/gcc/gcc/config/rs6000/rs6000.c:20992
0xb96fb3 output_addr_const(_IO_FILE*, rtx_def*)
/home/marxin/Programming/gcc/gcc/final.c:4202
0x14d9b05 print_operand_address(_IO_FILE*, rtx_def*)
/home/marxin/Programming/gcc/gcc/config/rs6000/rs6000.c:20973
0x102fb5c default_print_operand_address(_IO_FILE*, machine_mode, rtx_def*)
/home/marxin/Programming/gcc/gcc/targhooks.c:366
0xb968f1 output_address(machine_mode, rtx_def*)
/home/marxin/Programming/gcc/gcc/final.c:4066
0x14d966b print_operand(_IO_FILE*, rtx_def*, int)
/home/marxin/Programming/gcc/gcc/config/rs6000/rs6000.c:20886
0x102fb33 default_print_operand(_IO_FILE*, rtx_def*, int)
/home/marxin/Programming/gcc/gcc/targhooks.c:351
0xb9688d output_operand(rtx_def*, int)
/home/marxin/Programming/gcc/gcc/final.c:4050
0xb96452 output_asm_insn(char const*, rtx_def**)
/home/marxin/Programming/gcc/gcc/final.c:3962
0xb948e0 final_scan_insn_1
/home/marxin/Programming/gcc/gcc/final.c:3100
0xb94b05 final_scan_insn(rtx_insn*, _IO_FILE*, int, int, int*)
/home/marxin/Programming/gcc/gcc/final.c:3146
0xb92333 final_1
/home/marxin/Programming/gcc/gcc/final.c:2019
0xb97bdc rest_of_handle_final
/home/marxin/Programming/gcc/gcc/final.c:4657
0xb97f98 execute
/home/marxin/Programming/gcc/gcc/final.c:4731
>From gcc-bugs-return-612976-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 07:56:49 2018
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From: "su at cs dot ucdavis.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/86990] New: wrong code at -O2 on x86_64-linux-gnu in 64-bit mode
Date: Fri, 17 Aug 2018 07:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86990
Bug ID: 86990
Summary: wrong code at -O2 on x86_64-linux-gnu in 64-bit mode
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
It appears to be a recent regression. The reduced version is still quite large
and complex, but it should be valid. The original unreduced test is
miscompiled at -O2 and -O3 in both 32-bit and 64-bit modes.
$ gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/home/su/software/tmp/gcc/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/home/su/software/tmp/gcc/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 9.0.0 20180817 (experimental) [trunk revision 263611] (GCC)
$
$ gcctk -Os -w small.c; ./a.out
5
$ gcc-8.1.0 -O2 -w small.c; ./a.out
5
$
$ gcctk -O2 -w small.c; ./a.out
7
$
---------------------------------------
int printf (const char *, ...);
int i[6];
static int j, v, e, f, h = 5, k, l, n, o, p, q, r, s, u, w, x, y, z, aa, ab,
ac,
ad, ae, af, ag = 8, ah, ai, aj, ak, al;
char c;
struct a {
unsigned b;
int c : 9;
int d;
} static g = {9, 5};
static short m[1], t = 95, am;
int an, ao, ap;
void aq(ar) {
j = j & 5 ^ i[j ^ v & 5];
j = j & 5 ^ i[(j ^ v) & 5];
j = j & 4095 ^ (j ^ v) & 5;
}
void as(ar) {
if (n)
s = 0;
}
static unsigned at() {
int au[] = {4073709551615, 0};
for (; al; al--) {
if (r)
--x;
if (g.d)
l++;
printf("", j);
if (u)
ae = n = au[al];
}
r = 0;
return 0;
}
int aw(ar) {
int ax[] = {9, 5, 5, 9, 5}, ay = 3;
struct a az = {1, 3};
av:
an = (as((at(), ax)[2]), ax[4]);
{
int ba[] = {5, 5, 9, 8, 1, 0, 5, 5, 9, 8, 1, 0,
5, 5, 9, 8, 1, 0, 5, 5, 9, 8, 1};
int a[] = {8, 2, 8, 2, 8, 2, 8};
int b[] = {1027239, 8, 1, 7, 9, 2, 9, 4, 4, 2, 8, 1, 0, 4, 4, 2,
4, 4, 2, 9, 2, 9, 8, 1, 7, 9, 2, 9, 4, 4, 2};
if (z) {
struct a bc;
bb:
for (; e; e++)
for (; q;)
return ax[e];
if (bc.c < g.d <= a[7])
aa--;
}
{
struct a bd = {5};
int d[20] = {1, 9, 7, 7, 8, 4, 4, 4, 4, 8, 1, 9, 7, 7, 8, 4, 4, 4, 4};
c = h | r % g.c ^ x;
printf("", g);
am -= t | x;
if (h)
while (1) {
if (a[o]) {
struct a be;
if (ar) {
struct a bf = {908, 5, 3};
int bg[3], bh = k, bj = ag | ae, bk = aj + 3, bl = u << e;
if (f)
if (ac)
ak = w;
ag = -(ag & t);
af = ag ^ af;
if (8 < af)
break;
if (bj)
goto bi;
if (s)
printf("", 6);
be.d = k;
w = f - bh;
printf("", be);
if (w)
goto bb;
ao = r - aa && g.b;
if (y)
k++;
goto av;
bi:
if (aa)
continue;
if (f)
if (k)
printf("", g);
aj = ac + k ^ g.c;
g.c = bk;
ah = 0;
for (; ah < 3; ah++)
if (s)
bg[ah] = 8;
if (!ay)
printf("", ai);
u = bl;
g = bf;
} else
for (;; o += a[ap])
;
int bm[] = {0};
for (; p; p++)
c = ad;
ad = l;
if (bd.c) {
printf(" ");
goto bi;
}
}
int bn[] = {5, 2, 2, 5, 2, 2, 5, 2, 2, 5, 2, 2, 5, 2, 2, 5,
2, 2, 5, 2, 2, 5, 2, 2, 5, 2, 2, 5, 2, 2, 5, 2,
2, 5, 2, 2, 5, 2, 2, 5, 2, 2, 5, 2, 2, 5, 2};
struct a a[] = {905266581905224, 2, 8, 4, 2, 8, 4, 4, 2, 8, 4};
struct a b = {3075920};
if (f) {
aq(m[am + e]);
printf("", j);
printf("", e);
ab--;
}
if (ax[4]) {
if (l)
goto av;
++f;
} else
ay = az.c && a;
for (; ac; ac++)
m[f] = 0;
}
h = 9;
for (; y; y = 1)
if (f)
goto av;
}
}
return 0;
}
int main() {
aw(1);
printf("%d\n", g.c);
return 0;
}
>From gcc-bugs-return-612977-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 08:31:56 2018
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From: "konstantin.vladimirov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/86991] New: internal compiler error: in vectorizable_reduction, at tree-vect-loop.c:6919
Date: Fri, 17 Aug 2018 08:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86991
Bug ID: 86991
Summary: internal compiler error: in vectorizable_reduction, at
tree-vect-loop.c:6919
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: konstantin.vladimirov at gmail dot com
Target Milestone: ---
Minimal reproduction:
int b;
extern unsigned c[];
unsigned d;
long e;
void f() {
unsigned g, h;
for (; d; d += 2) {
g = 1;
for (; g; g += 3) {
h = 2;
for (; h < 6; h++)
c[h] = c[h] - b - ~e;
}
}
}
Compiler:
gcc -v
Reading specs from
/apps/gcc/8.1.0/.bin/../lib64/gcc/x86_64-suse-linux/8.1.0/specs
COLLECT_GCC=/apps/gcc/8.1.0/.bin/gcc
COLLECT_LTO_WRAPPER=/apps/gcc/8.1.0/.bin/../libexec/gcc/x86_64-suse-linux/8.1.0/lto-wrapper
Target: x86_64-suse-linux
Configured with: ./configure --prefix=/apps/gcc/8.1.0
--libdir=/apps/gcc/8.1.0/lib64 --libexecdir=/apps/gcc/8.1.0/libexec
--bindir=/apps/gcc/8.1.0/bin --with-isl=/apps/gcc/8.1.0
--with-libelf=/apps/gcc/8.1.0 --with-mpfr=/apps/gcc/8.1.0
--with-gmp=/apps/gcc/8.1.0 --with-mpc=/apps/gcc/8.1.0
--disable-gnu-unique-object --enable-gold=yes --enable-lto
--enable-languages=c,c++,objc,fortran --build=x86_64-suse-linux
--host=x86_64-suse-linux --target=x86_64-suse-linux --enable-libotm
--disable-multilib --disable-bootstrap --disable-libstdcxx-pch
Thread model: posix
gcc version 8.1.0 (GCC)
Compile with:
gcc min.c -O3
You shall see:
during GIMPLE pass: vect
min.c: In function ‘f’:
min.c:7:6: internal compiler error: in vectorizable_reduction, at
tree-vect-loop.c:6919
void f() {
^
0x620ba8 ???
../sysdeps/x86_64/elf/start.S:113
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Subject: [Bug middle-end/86505] [6/7/8 Regression] __builtin_va_arg_pack_len() computes the number of arguments wrongly
Date: Fri, 17 Aug 2018 08:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86505
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |9.0
Summary|[6/7/8/9 Regression] |[6/7/8 Regression]
|__builtin_va_arg_pack_len() |__builtin_va_arg_pack_len()
|computes the number of |computes the number of
|arguments wrongly |arguments wrongly
Known to fail|9.0 |
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
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Subject: [Bug middle-end/86505] [6/7/8 Regression] __builtin_va_arg_pack_len() computes the number of arguments wrongly
Date: Fri, 17 Aug 2018 08:49:00 -0000
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Aug 17 08:48:58 2018
New Revision: 263613
URL: https://gcc.gnu.org/viewcvs?rev=263613&root=gcc&view=rev
Log:
2018-08-17 Richard Biener <rguenther@suse.de>
PR middle-end/86505
* tree-inline.c (copy_bb): When inlining __builtin_va_arg_pack_len ()
across a va-arg-pack using call adjust its return value accordingly.
* gcc.dg/torture/pr86505.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr86505.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-inline.c
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Subject: [Bug middle-end/86505] [6/7/8 Regression] __builtin_va_arg_pack_len() computes the number of arguments wrongly
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |asolokha at gmx dot com
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
I wonder if the auto-regression police can help here increasing coverage?
>From gcc-bugs-return-612981-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 09:13:28 2018
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Subject: [Bug c++/54710] moderately large tuple, with many gets, increases compile time
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--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #11)
> Created attachment 41894 [details]
> result of compiling with -ftime-report -ftime-report-details -fstats
>
> (In reply to Larry Evans from comment #10)
> > Created attachment 28294 [details]
> > with optimized clang, still with optimized gcc, both with -O1
> >
> > Remade clang with make ENABLE_OPTIMIZED=1. Clang times improved a lot.
> >
> > Now, the degradation of relative performance of gcc w.r.t. clang
> > is more dramatic.
> >
> > Still, gcc does better at low LAST_LESS, but reaches break even
> > at lower LAST_LESS (about 8).
>
> Confirmed:
>
> $ /usr/local/bin/gcc -c -O1 -time tuple.benchmark.mini.horiz.cpp
> # cc1plus 4.62 0.25
> # as 0.02 0.01
> $
>
> I guess 4 and a half seconds is kinda long. Attaching a more detailed time
> report as a separate file.
Time is spent in the C++ parser and the GIMPLE/tree verifiers. Your
cc1plus is built with --enable-checking=yes ...
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Subject: [Bug tree-optimization/86841] ICE in gcc/gcc/tree-vrp.c:1325 with graphite
Date: Fri, 17 Aug 2018 09:24:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's a problem with the VRP machinery assuming shift counts are never bigger
than 64bits...
/* Transform left shifts by constants into multiplies. */
if (wi::eq_p (vr1_lb, vr1_ub))
{
int shift = wi::extract_uhwi (vr1_ub, 0, vr1_ub.get_precision ());
wide_int tmp = wi::set_bit_in_zero (shift, prec);
return wide_int_range_multiplicative_op (res_lb, res_ub,
MULT_EXPR, sign, prec,
vr0_lb, vr0_ub, tmp, tmp,
overflow_undefined,
/*overflow_wraps=*/true);
this should use wi::to_uhwi.
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Subject: [Bug tree-optimization/86841] ICE in gcc/gcc/tree-vrp.c:1325 with graphite
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Aug 17 09:26:53 2018
New Revision: 263615
URL: https://gcc.gnu.org/viewcvs?rev=263615&root=gcc&view=rev
Log:
2018-08-17 Richard Biener <rguenther@suse.de>
PR tree-optimization/86841
* wide-int-range.cc (wide_int_range_lshift): Use to_uhwi.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/wide-int-range.cc
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Subject: =?UTF-8?B?W0J1ZyBvdGhlci84Njk5Ml0gTmV3OiBbOCBSZWdyZXNzaW9uXSBnY2M6IGVy?= =?UTF-8?B?cm9yOiB1bnJlY29nbml6ZWQgY29tbWFuZCBsaW5lIG9wdGlvbiDigJgtZmNp?= =?UTF-8?B?bGtwbHVz4oCZ?Date: Fri, 17 Aug 2018 09:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86992
Bug ID: 86992
Summary: [8 Regression] gcc: error: unrecognized command line
option ‘-fcilkplus’
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: rejects-valid
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Starting from r255195 the option should be ignored, but is not. On trunk fixed
in r263614.
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Subject: [Bug tree-optimization/86841] ICE in gcc/gcc/tree-vrp.c:1325 with graphite
Date: Fri, 17 Aug 2018 09:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86841
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-612986-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 09:34:17 2018
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Subject: [Bug tree-optimization/59859] [meta-bug] GRAPHITE issues
Date: Fri, 17 Aug 2018 09:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59859
Bug 59859 depends on bug 86841, which changed state.
Bug 86841 Summary: ICE in gcc/gcc/tree-vrp.c:1325 with graphite
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86841
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-612987-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 09:55:24 2018
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Subject: [Bug middle-end/86864] [9 Regression] ICE in commit_one_edge_insertion, at cfgrtl.c:2025 since r261795
Date: Fri, 17 Aug 2018 09:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86864
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ebotcazou at gcc dot gnu.org
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue looks like that
(jump_insn 19 18 20 3 (parallel [
(set (pc)
(reg:DI 94))
(use (label_ref 21))
]) -1
(nil)
-> 21)
(barrier 20 19 21)
doesn't have the jump at the end. Whoever inserted that barrier insn did it
wrong. But I'm not too much of an expert here either.
>From gcc-bugs-return-612988-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 09:56:10 2018
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Subject: [Bug c++/57510] initializer_list memory leak
Date: Fri, 17 Aug 2018 09:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57510
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Comment 1 was fixed, but comment 0 was not, this bug is still present on trunk.
The example in comment 0 built with ASan shows:
=================================================================
==6556==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 8 byte(s) in 2 object(s) allocated from:
#0 0x7ffa9489a340 in operator new(unsigned long)
/home/jwakely/src/gcc/gcc/libsanitizer/asan/asan_new_delete.cc:90
#1 0x400ef6 in X::X() /tmp/leak2.cc:6
#2 0x400db1 in main /tmp/leak2.cc:20
#3 0x7ffa93b33f29 in __libc_start_main ../csu/libc-start.c:308
SUMMARY: AddressSanitizer: 8 byte(s) leaked in 2 allocation(s).
Possibly a dup of PR 66139
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Subject: [Bug c++/57510] initializer_list memory leak
Date: Fri, 17 Aug 2018 10:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57510
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The example from PR 57930 isn't fixed either:
extern "C" int printf(const char *,...);
struct B {
B(int,int) { printf("CB %p\n",this); }
B(const B&) { printf("const CB %pn\n",this); }
B(B&&) { printf("const CB %pn\n",this); }
~B() { printf("B %p\n",this); }
};
struct C {
int c;
int c2;
};
struct A {
struct B b;
struct C c;
};
A test() {
//const A a1 = { { 1, 2 }, { 3, (throw 9, 4) } } ; // destructor for B
called
//const A &a2 = { { 1, 2 }, { 3, (throw 9, 4) } } ; // destructor for B
not called
return { { 1, 2 }, { 3, (throw 9, 4) } } ; // destructor for B not
called
};
int main() {
try {
test();
} catch (...) {
}
}
This prints:
CB 0x7ffd6eac7620
But should be:
CB 0x7ffd6eac7620
B 0x7ffd6eac7620
>From gcc-bugs-return-612990-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 10:08:27 2018
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Subject: =?UTF-8?B?W0J1ZyBvdGhlci84Njk5Ml0gWzggUmVncmVzc2lvbl0gZ2NjOiBlcnJvcjog?= =?UTF-8?B?dW5yZWNvZ25pemVkIGNvbW1hbmQgbGluZSBvcHRpb24g4oCYLWZjaWxrcGx1?= =?UTF-8?B?c+KAmQ==?Date: Fri, 17 Aug 2018 10:08:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-17
Known to work| |7.3.0, 9.0
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
Target Milestone|--- |8.3
Ever confirmed|0 |1
Known to fail| |8.2.0
>From gcc-bugs-return-612991-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 10:11:01 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86986] [6/7/8/9 Regression] Unexpected errors for template parameter pack in a template template parameter
Date: Fri, 17 Aug 2018 10:11:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-17
Known to work| |4.8.5
Summary|Unexpected errors for |[6/7/8/9 Regression]
|template parameter pack in |Unexpected errors for
|a template template |template parameter pack in
|parameter |a template template
| |parameter
Ever confirmed|0 |1
Known to fail| |4.9.0, 5.5.0, 6.4.0, 7.3.0,
| |8.2.0, 9.0
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
GCC 4.8 compiled it too, so this is a regression.
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Subject: [Bug c++/86986] [6/7/8/9 Regression] Unexpected errors for template parameter pack in a template template parameter
Date: Fri, 17 Aug 2018 10:12:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Started with r208178
PR c++/54440
* pt.c (get_template_parm_index): New.
(fixed_parameter_pack_p_1, fixed_parameter_pack_p): New.
(process_template_parm): Allow bare packs in template template
parm template parms.
(coerce_template_parameter_pack): Handle fixed template template
parm packs and fixed packs not at the end of the parm list.
(coerce_template_parms): Handle template parm packs not at the end
of the parm list.
(gen_elem_of_pack_expansion_instantiation): Handle a decl
expansion.
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Subject: [Bug c++/86980] Lambda function with return type rvalue reference dtor issue
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes.
>From gcc-bugs-return-612994-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 10:20:36 2018
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Subject: [Bug c++/86094] [8/9 Regression] Call ABI changed for small objects with defaulted ctor
Date: Fri, 17 Aug 2018 10:20:00 -0000
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--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No, because the same code is generated for -fabi-version=12 and
-fabi-version=13
>From gcc-bugs-return-612995-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 10:25:47 2018
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Subject: [Bug lto/41565] -m32 causes an ICE when the object files were compiled with 64bit
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--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
It should happen everywhere, no explicit lto1 invocation should be necessary.
> ./xgcc -B. t.c -flto -c
> ./xgcc -B. t.o -m32
/usr/lib64/gcc/x86_64-suse-linux/4.8/../../../../x86_64-suse-linux/bin/ld:
skipping incompatible libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/lib64/gcc/x86_64-suse-linux/4.8/../../../../x86_64-suse-linux/bin/ld:
skipping incompatible libgcc_s.so.1 when searching for libgcc_s.so.1
lto1: internal compiler error: in operator[], at vec.h:841
0x871a92 vec<tree_node*, va_heap, vl_embed>::operator[](unsigned int)
/tmp/trunk/gcc/vec.h:841
0x870416 vec<tree_node*, va_heap, vl_ptr>::operator[](unsigned int)
/tmp/trunk/gcc/vec.h:1360
0x11e26fe streamer_tree_cache_get_tree
/tmp/trunk/gcc/tree-streamer.h:98
0x11e6b18 streamer_get_pickled_tree(lto_input_block*, data_in*)
/tmp/trunk/gcc/tree-streamer-in.c:1100
...
but as said, fixing aka diagnosing this in a "nicer" form is somewhat
difficult.
>From gcc-bugs-return-612996-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 10:26:20 2018
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Subject: [Bug tree-optimization/86865] [9 Regression] Wrong code w/ -O2 -floop-parallelize-all -fstack-reuse=none -fwrapv -fno-tree-ch -fno-tree-dce -fno-tree-dominator-opts -fno-tree-loop-ivcanon
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will have a look.
>From gcc-bugs-return-612997-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 10:29:54 2018
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Subject: [Bug tree-optimization/86884] aggressive loop optimization and effective type
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's invalid in GIMPLE as well. You are accessing the storage through p->c[n]
which constrains the accesses to the array size of c (it is not a trailing
array).
>From gcc-bugs-return-612998-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 10:38:54 2018
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From: "malcolm.parsons at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86993] New: assignment of read-only variable error reported at wrong location
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Bug ID: 86993
Summary: assignment of read-only variable error reported at
wrong location
Product: gcc
Version: 6.1.0
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For this C++ code:
int main() {
const int i = 5;
i = 5 + 6;
}
g++ 5.1 reports:
<source>: In function 'int main()':
<source>:3:7: error: assignment of read-only variable 'i'
i = 5 + 6;
^
but g++ 6.1 and later report:
<source>: In function 'int main()':
<source>:3:13: error: assignment of read-only variable 'i'
i = 5 + 6;
^
gcc doesn't have this issue for C code.
See https://godbolt.org/g/Hoojyt and https://godbolt.org/g/WQR5XS
>From gcc-bugs-return-612999-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 10:54:38 2018
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Subject: [Bug tree-optimization/86889] s390x gcc build fails when configured with --disable-checking
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
So the issue is that the __builtin_unreachable () elides the g >= 0 test,
effectively making the loop endless. If you disable EVRP and CUNROLLI then
VRP1 will do this transform.
<bb 6> :
# g_2 = PHI <1(2), g_7(5)>
if (g_2 != -1)
goto <bb 3>; [INV]
else
goto <bb 7>; [INV]
It goes like EVRP computing the range of g_2 to [0, 1] (correctly, based on
the __builtin_unreachable) and then CFG cleanup simplifying the conditional
to false, removing the __builtin_unreachable () call.
cunrolli then computes the loop to run twice and inserts that stray [-1] array
reference, exposing it's old latent issue of sometimes emitting stray
iterations as the reporter already analyzed (it can at most handle the _last_
iteration when marking blocks as never executed, but in cases where the IV
increment is at unfortunate places it has to look at the previous peeled
copy as well).
Maybe I can get to improve this. Don't hold your breath.
I think we have dups of this (but maybe closed because they no longer warn).
>From gcc-bugs-return-613000-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 10:59:58 2018
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Subject: [Bug tree-optimization/80334] [5 Regression] Segfault when taking address of copy of unaligned struct
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--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Alexandre Oliva from comment #12)
> Created attachment 44527 [details]
> candidate patch to fix the error noted in comment 11
>
> This patch fixes the unaligned accesses in the testcase in comment 11. I
> haven't yet tested it otherwise.
The patch doesn't make much sense. Whoever is "consuming" the pointer
does the wrong thing.
Please open a new bug as well.
>From gcc-bugs-return-613001-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 11:03:10 2018
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Subject: [Bug libstdc++/86963] std::tuple incorrectly assigned
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
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Subject: [Bug tree-optimization/86927] [8/9 Regression] Gcc miscompiles at -O3 on valid code
Date: Fri, 17 Aug 2018 11:04:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine then.
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Subject: [Bug c++/86993] [6/7/8/9 Regression] assignment of read-only variable error reported at wrong location
Date: Fri, 17 Aug 2018 11:11:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-17
CC| |dmalcolm at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Started with r231293
C++ FE: expression ranges
gcc/ChangeLog:
* convert.c (convert_to_real_1): When converting from a
REAL_TYPE, preserve the location of EXPR in the result.
* tree.c (get_pure_location): Make non-static.
(set_source_range): Return the resulting location_t.
(make_location): New function.
* tree.h (get_pure_location): New decl.
(get_finish): New inline function.
(set_source_range): Convert return type from void to location_t.
(make_location): New decl.
...
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Fri Aug 17 11:33:25 2018
New Revision: 263616
URL: https://gcc.gnu.org/viewcvs?rev=263616&root=gcc&view=rev
Log:
Fix wrong option declaration of fcilkplus (PR other/86992).
2018-08-17 Martin Liska <mliska@suse.cz>
PR other/86992
* c.opt: Fix declaration of cilkplus.
Modified:
branches/gcc-8-branch/gcc/c-family/ChangeLog
branches/gcc-8-branch/gcc/c-family/c.opt
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug c++/86763] [7/8 Regression] Wrong code comparing member of copy of a 237 byte object with nontrivial default constructor on x86-64 arch
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--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Aug 17 11:51:48 2018
New Revision: 263617
URL: https://gcc.gnu.org/viewcvs?rev=263617&root=gcc&view=rev
Log:
2018-08-17 Richard Biener <rguenther@suse.de>
Backport from mainline
2018-08-02 Richard Biener <rguenther@suse.de>
PR c++/86763
* class.c (layout_class_type): Copy TYPE_TYPELESS_STORAGE
to the CLASSTYPE_AS_BASE.
* g++.dg/torture/pr86763.C: New testcase.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/torture/pr86763.C
Modified:
branches/gcc-8-branch/gcc/cp/ChangeLog
branches/gcc-8-branch/gcc/cp/class.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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Subject: [Bug target/86994] [9 regression] 64-bit gcc.target/i386/20040112-1.c FAILs
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Rainer Orth <ro at gcc dot gnu.org> changed:
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Subject: [Bug target/86994] New: [9 regression] 64-bit gcc.target/i386/20040112-1.c FAILs
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Bug ID: 86994
Summary: [9 regression] 64-bit gcc.target/i386/20040112-1.c
FAILs
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
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CC: ubizjak at gmail dot com
Target Milestone: ---
Target: i?86-*-*, x86-*-*
Between 20180816 (r263590) and 20180817 (r263613), gcc.target/i386/20040112-1.c
started to FAIL for 64-bit:
+FAIL: gcc.target/i386/20040112-1.c scan-assembler testb
Seen on i386-pc-solaris2.11 and x86_64-pc-linux-gnu.
Compared to the gcc-8 branch, the code changed from
- testb %al, %al
- jns .L2
+ cmpb $-1, %al
+ jg .L2
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Subject: [Bug preprocessor/77488] Proposal for __FILENAME_ONLY__
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Piotr Henryk Dabrowski <phd at phd dot re> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |phd at phd dot re
--- Comment #6 from Piotr Henryk Dabrowski <phd at phd dot re> ---
You can use:
#line 2 "FileName.cpp"
at the very top (!) of all your files
to change the content of __FILE__.
This also affects compiler messages.
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Subject: [Bug middle-end/86995] [9 regression] c-c++-common/torture/builtin-arith-overflow-17.c etc. FAIL
Date: Fri, 17 Aug 2018 12:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86995
Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
>From gcc-bugs-return-613010-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 12:27:12 2018
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Subject: [Bug middle-end/86995] New: [9 regression] c-c++-common/torture/builtin-arith-overflow-17.c etc. FAIL
Date: Fri, 17 Aug 2018 12:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86995
Bug ID: 86995
Summary: [9 regression]
c-c++-common/torture/builtin-arith-overflow-17.c etc.
FAIL
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
Target Milestone: ---
Target: i?86-*-*, x86_64-*-*, powerpc64-*-*
Between 20180816 (r263590) and 20180817 (r263613), two tests started to FAIL
on 64-bit Solaris/x86 and Linux/x86_64:
+FAIL: c-c++-common/torture/builtin-arith-overflow-17.c -O0 execution test
+FAIL: c-c++-common/torture/builtin-arith-overflow-17.c -O2 execution test
+FAIL: c-c++-common/torture/builtin-arith-overflow-17.c -O2 -flto execution
test
+FAIL: c-c++-common/torture/builtin-arith-overflow-17.c -O2 -flto
-flto-partition=none execution test
+FAIL: c-c++-common/torture/builtin-arith-overflow-p-17.c -O0 execution test
+FAIL: c-c++-common/torture/builtin-arith-overflow-p-17.c -O2 execution test
+FAIL: c-c++-common/torture/builtin-arith-overflow-p-17.c -O2 -flto
execution test
+FAIL: c-c++-common/torture/builtin-arith-overflow-p-17.c -O2 -flto
-flto-partition=none execution test
There's also a report on Linux/PowerPC64.
The test aborts here:
#0 0x00007fffbe855cca in __lwp_sigqueue () from /lib/64/libc.so.1
#1 0x00007fffbe84c522 in thr_kill () from /lib/64/libc.so.1
#2 0x00007fffbe7870f9 in raise () from /lib/64/libc.so.1
#3 0x00007fffbe750eb1 in abort () from /lib/64/libc.so.1
#4 0x000000000042c3a2 in t150sub ()
at
/vol/gcc/src/hg/trunk/local/gcc/testsuite/c-c++-common/torture/builtin-arith-overflow-17.c:10
#5 0x0000000000435736 in main ()
at
/vol/gcc/src/hg/trunk/local/gcc/testsuite/c-c++-common/torture/builtin-arith-overflow-17.c:18
>From gcc-bugs-return-613012-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 12:32:49 2018
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Subject: [Bug middle-end/86996] New: [9 regression] gcc.dg/tree-ssa/builtin-sprintf-warn-1.c FAILs
Date: Fri, 17 Aug 2018 12:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86996
Bug ID: 86996
Summary: [9 regression]
gcc.dg/tree-ssa/builtin-sprintf-warn-1.c FAILs
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: edlinger at gcc dot gnu.org, law at gcc dot gnu.org,
msebor at gcc dot gnu.org
Target Milestone: ---
Target: *-*-solaris2.*
Between 20180816 (r263590) and 20180817 (r263613), a test started to FAIL on
Solaris/SPARC and x86, both 32 and 64-bit:
+FAIL: gcc.dg/tree-ssa/builtin-sprintf-warn-1.c (test for warnings, line 1563)
+FAIL: gcc.dg/tree-ssa/builtin-sprintf-warn-1.c (test for excess errors)
Excess errors:
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-1.c:1563:3:
warning: '__builtin_snprintf' output may be truncated before the last format
character [-Wformat-truncation=]
This suggests strongly one of the strlen etc. patches committed in that
timeframe.
>From gcc-bugs-return-613013-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 12:33:21 2018
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Subject: [Bug middle-end/86996] [9 regression] gcc.dg/tree-ssa/builtin-sprintf-warn-1.c FAILs
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Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
>From gcc-bugs-return-613014-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 12:38:06 2018
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Subject: [Bug middle-end/86996] [9 regression] gcc.dg/tree-ssa/builtin-sprintf-warn-1.c FAILs
Date: Fri, 17 Aug 2018 12:38:00 -0000
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Bernd Edlinger <bernd.edlinger at hotmail dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bernd.edlinger at hotmail dot de
--- Comment #1 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
is this a target where wchar_t is 16-bit wide?
>From gcc-bugs-return-613015-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 12:41:53 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: =?UTF-8?B?W0J1ZyBjKysvODY5OTddIE5ldzogZXJyb3I6IGNhbGwgb2Ygb3ZlcmxvYWRl?= =?UTF-8?B?ZCDigJhOb0Rlc3RydWN0b3IoPGJyYWNlLWVuY2xvc2VkIGluaXRpYWxpemVy?= =?UTF-8?B?IGxpc3Q+KeKAmSBpcyBhbWJpZ3VvdXM=?Date: Fri, 17 Aug 2018 12:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86997
Bug ID: 86997
Summary: error: call of overloaded
‘NoDestructor(<brace-enclosed initializer list>)’ is
ambiguous
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: jason at gcc dot gnu.org
Target Milestone: ---
All GCC releases reject a test-case isolated from Chromium:
$ cat browser_theme_pack.ii
class a;
struct NoDestructor {
NoDestructor();
NoDestructor(a);
};
int main()
{
NoDestructor b({});
}
$ g++ -c browser_theme_pack.ii
browser_theme_pack.ii: In function ‘int main()’:
browser_theme_pack.ii:10:20: error: call of overloaded
‘NoDestructor(<brace-enclosed initializer list>)’ is ambiguous
NoDestructor b({});
^
browser_theme_pack.ii:5:3: note: candidate: ‘NoDestructor::NoDestructor(a)’
NoDestructor(a);
^~~~~~~~~~~~
browser_theme_pack.ii:3:8: note: candidate: ‘constexpr
NoDestructor::NoDestructor(const NoDestructor&)’
struct NoDestructor {
^~~~~~~~~~~~
browser_theme_pack.ii:3:8: note: candidate: ‘constexpr
NoDestructor::NoDestructor(NoDestructor&&)’
While clang++ and ICC accept that:
$ clang++ -c browser_theme_pack.ii -S -o/dev/stdout | grep call
callq _ZN12NoDestructorC1Ev
$ c++filt _ZN12NoDestructorC1Ev
NoDestructor::NoDestructor()
>From gcc-bugs-return-613016-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 12:42:10 2018
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-17
CC| |nathan at gcc dot gnu.org
Ever confirmed|0 |1
>From gcc-bugs-return-613017-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 12:46:50 2018
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Subject: [Bug middle-end/86996] [9 regression] gcc.dg/tree-ssa/builtin-sprintf-warn-1.c FAILs
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--- Comment #2 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #1 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
> is this a target where wchar_t is 16-bit wide?
No, wchar_t is always 32-bit. Cf. gcc/config/sol2.h:
/* wchar_t is called differently in <wchar.h> for 32 and 64-bit
compilations. This is called for by SCD 2.4.1, p. 6-83, Figure 6-65
(32-bit) and p. 6P-10, Figure 6.38 (64-bit). */
#undef WCHAR_TYPE
#define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
#undef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE 32
>From gcc-bugs-return-613018-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 12:56:07 2018
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86997
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Looks like a dup of PR 59389
>From gcc-bugs-return-613019-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 13:08:21 2018
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Subject: [Bug preprocessor/77488] Proposal for __FILENAME_ONLY__
Date: Fri, 17 Aug 2018 13:08:00 -0000
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--- Comment #7 from R. Diez <rdiezmail-gcc at yahoo dot de> ---
(In reply to Piotr Henryk Dabrowski from comment #6)
> You can use:
>
> #line 2 "FileName.cpp"
>
> at the very top (!) of all your files
> to change the content of __FILE__.
> This also affects compiler messages.
I do not want to override __FILE__. Its original content may be needed for
something else. I just want an alternative to generate smaller asserts.
Besides, maintaining such a "#line" hack in all files is uncomfortable. I
already mentioned that I am including other libraries with their own source
code and build systems. I need a way to tweak the assert definition for all of
them in Newlib. Otherwise, I have to patch all components everywhere.
>From gcc-bugs-return-613020-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 13:13:22 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86998] New: Improve diagnostic for missing comma in template-parameter-list
Date: Fri, 17 Aug 2018 13:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86998
Bug ID: 86998
Summary: Improve diagnostic for missing comma in
template-parameter-list
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
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template<typename T typename U> void f() { }
GCC says:
err.cc:1:19: error: expected nested-name-specifier before 'T'
1 | template<typename T typename U> void f() { }
| ^
err.cc:1:21: error: expected '>' before 'typename'
1 | template<typename T typename U> void f() { }
| ^~~~~~~~
The first error is not helpful. The second error is OK, although it would be
more correct (and helpful) to say that a comma would also be accepted, as Clang
does:
err.cc:1:19: error: expected a qualified name after 'typename'
template<typename T typename U> void f() { }
^
err.cc:1:21: error: expected ',' or '>' in template-parameter-list
template<typename T typename U> void f() { }
^
2 errors generated.
I don't know why all of GCC, Clang and EDG say something about a
nested-name-specifier or qualified name for the first template-parameter. I
don't think the grammar allows a qualified-id there, only a plain identifier.
>From gcc-bugs-return-613022-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 13:26:34 2018
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Subject: [Bug c++/86998] Improve diagnostic for missing comma in template-parameter-list
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The ideal would be a fix-it hint suggesting to add the comma.
Adding the '>' that the parser says is expected would not make the code correct
because 'template<typename T> typename U>' isn't valid as a top-level
declaration (only as a template-parameter).
>From gcc-bugs-return-613021-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 13:26:14 2018
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Subject: [Bug middle-end/86996] [9 regression] gcc.dg/tree-ssa/builtin-sprintf-warn-1.c FAILs
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Jeffrey A. Law <law at redhat dot com> changed:
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CC| |law at redhat dot com
--- Comment #3 from Jeffrey A. Law <law at redhat dot com> ---
Rainer, can you compile the test with -save-temps on one of your solaris boxes
and attach it? Thanks
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Subject: [Bug middle-end/86996] [9 regression] gcc.dg/tree-ssa/builtin-sprintf-warn-1.c FAILs
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--- Comment #4 from Rainer Orth <ro at gcc dot gnu.org> ---
Created attachment 44553
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44553&action=edit
i386-pc-solaris2.11 -m32 builtin-sprintf-warn-1.i
Sure, here's the 32-bit Solaris 11.5/x86 version.
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Subject: [Bug c++/86942] A trailing-return-type is allowed when the return type is not 'auto' for using declarations
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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Keywords| |patch
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2018-08/msg00990.html
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Subject: [Bug fortran/82036] [F08] Recursive allocatable class components cause infinite loop in compilation
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Jürgen Reuter <juergen.reuter at desy dot de> changed:
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--- Comment #2 from Jürgen Reuter <juergen.reuter at desy dot de> ---
In the meantime, this has become an ICE.
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Subject: [Bug c++/86763] [7 Regression] Wrong code comparing member of copy of a 237 byte object with nontrivial default constructor on x86-64 arch
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86763
--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Aug 17 14:17:10 2018
New Revision: 263621
URL: https://gcc.gnu.org/viewcvs?rev=263621&root=gcc&view=rev
Log:
2018-08-17 Richard Biener <rguenther@suse.de>
Backport from mainline
2018-08-02 Richard Biener <rguenther@suse.de>
PR c++/86763
* class.c (layout_class_type): Copy TYPE_TYPELESS_STORAGE
to the CLASSTYPE_AS_BASE.
* g++.dg/torture/pr86763.C: New testcase.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/torture/pr86763.C
Modified:
branches/gcc-7-branch/gcc/cp/ChangeLog
branches/gcc-7-branch/gcc/cp/class.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug c++/86763] [7 Regression] Wrong code comparing member of copy of a 237 byte object with nontrivial default constructor on x86-64 arch
Date: Fri, 17 Aug 2018 14:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86763
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Known to work| |7.3.1
Resolution|--- |FIXED
Target Milestone|8.3 |7.4
Known to fail| |7.3.0
--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug c++/86970] Rejected constexpr expression involving lambdas and inheritance, "use of this in a constant expression"
Date: Fri, 17 Aug 2018 14:54:00 -0000
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ensadc at mailnesia dot com changed:
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----------------------------------------------------------------------------
CC| |ensadc at mailnesia dot com
--- Comment #1 from ensadc at mailnesia dot com ---
Removed `#include`:
----
template<typename T>
struct faketuple
{
template<typename U>
constexpr faketuple(U&& u) { }
constexpr faketuple(const faketuple&) = default;
};
namespace ns {
template <typename A>
class Foo : private A
{
public:
template <typename FA>
explicit constexpr Foo(FA&& a)
: A{static_cast<FA&&>(a)}
{}
};
template <typename A>
Foo(A)->Foo<A>;
template <typename T>
constexpr auto frobnicate(T&& val)
{
return [val = static_cast<T&&>(val)] {};
}
template <typename A, typename B>
class Bar
{
A a;
faketuple<B> b;
public:
template <typename FA, typename FB>
explicit constexpr Bar(FA&& a, FB&& b)
: a{a}
, b{b}
{}
};
template <typename A, typename B>
Bar(A, B)->Bar<A, B>;
constexpr auto Baz = ns::Foo{ns::frobnicate(ns::Bar{[] {}, [](int) {}})};
}
----
But `std::tuple` has a move constructor, unlike `faketuple` :/
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/86999] New: Incorrect code generation and missing optimization with -fno-signed-zeros.
Date: Fri, 17 Aug 2018 17:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86999
Bug ID: 86999
Summary: Incorrect code generation and missing optimization
with -fno-signed-zeros.
Product: gcc
Version: 8.2.0
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Consider the following trivial example (https://godbolt.org/g/5ms6Bf):
#include <limits.h>
typedef float v4f __attribute__((vector_size(16)));
typedef int v4i __attribute__((vector_size(16)));
v4f foo(v4f n, v4f p)
{
return n * p + p;
}
template <int N> v4f __neg1(v4f a)
{
v4i v = {((N & 1) ? INT_MIN : 0), ((N & 2) ? INT_MIN : 0), ((N & 4) ?
INT_MIN : 0), ((N & 8) ? INT_MIN : 0)};
return __builtin_ia32_xorps(a, (v4f)v);
}
template <int N> v4f __neg2(v4f a)
{
v4i v = {((N & 1) ? INT_MIN : 0), ((N & 2) ? INT_MIN : 0), ((N & 4) ?
INT_MIN : 0), ((N & 8) ? INT_MIN : 0)};
return (v4f)((v4i)a ^ v);
}
v4f neg1C(v4f a)
{
return __neg1<0x0C>(a);
}
v4f neg2C(v4f a)
{
return __neg2<0x0C>(a);
}
On GCC 7.x/8.x with -fno-signed-zeros (or implied by other flags eg.: -Ofast)
foo() is not optimal on FMA capable hardware:
foo(float __vector(4), float __vector(4)):
vmulps xmm0, xmm0, xmm1
vaddps xmm0, xmm0, xmm1
ret
With -fsigned-zeros:
foo(float __vector(4), float __vector(4)):
vfmadd132ps xmm0, xmm1, xmm1
ret
Incorrect code is generated only on GCC 8.x with -fno-signed-zeros:
neg1C(float __vector(4)):
ret
With -fsigned-zeros or with GCC 7.x:
neg1C(float __vector(4)):
vxorps xmm0, xmm0, XMMWORD PTR .LC1[rip]
ret
.LC1:
.long 0
.long 0
.long 2147483648
.long 2147483648
Note however when using bitwise xor instead of __builtin_ia32_xorps() the
generated code is correct in all cases:
neg2C(float __vector(4)):
vxorps xmm0, xmm0, XMMWORD PTR .LC1[rip]
ret
.LC1:
.long 0
.long 0
.long 2147483648
.long 2147483648
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From: "nsz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/71625] missing strlen optimization on different array initialization style
Date: Fri, 17 Aug 2018 17:26:00 -0000
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--- Comment #19 from nsz at gcc dot gnu.org ---
Author: nsz
Date: Fri Aug 17 17:26:11 2018
New Revision: 263624
URL: https://gcc.gnu.org/viewcvs?rev=263624&root=gcc&view=rev
Log:
Fix poly types after PR tree-optimization/71625 strlen optimization
Same as r263561, but for arm: avoid compilation errors caused by poly
initializers getting treated as string literals.
Tested on arm-none-linux-gnueabihf.
gcc/ChangeLog:
* config/arm/arm-builtins.c (arm_init_simd_builtin_types): Clear
polyNxK_t element's TYPE_STRING_FLAG.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/arm/arm-builtins.c
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From: "gavin.keith.ridley at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/87000] New: LBOUND and UBOUND give unexpected result for arrays without 1-based indices if in subprogram
Date: Fri, 17 Aug 2018 17:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87000
Bug ID: 87000
Summary: LBOUND and UBOUND give unexpected result for arrays
without 1-based indices if in subprogram
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libfortran
Assignee: unassigned at gcc dot gnu.org
Reporter: gavin.keith.ridley at gmail dot com
Target Milestone: ---
If an array is allocated with indices that don't start at one, lbound and
ubound seem to give incorrect answers if the array is passed to any subprogram.
This program clearly illustrates the issue, compiled with no flags:
program asdf
use iso_fortran_env
implicit none
real(real64), dimension(-5:10) :: arr
print *, 'lbound = ', lbound(arr)
print *, 'ubound = ', ubound(arr)
call boundprinter(arr)
contains
subroutine boundprinter(x)
real(real64), intent(in), dimension(:) :: x
print *, 'lbound = ', lbound(x)
print *, 'ubound = ', ubound(x)
endsubroutine boundprinter
endprogram asdf
Which prints:
lbound = -5
ubound = 10
lbound = 1
ubound = 16
Shouldn't these be consistent?
Very notably, it seems gcc 4 gives the correct answer, but not gcc 8.1.0. This
bug causes segfaults in a program called MPACT developed by Oak Ridge National
Lab and University of Michigan which I'd estimate somewhere between 50 and 100
people use. As a result of this, all of their compiles are still done on gcc 4.
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/87000] LBOUND and UBOUND give unexpected result for arrays without 1-based indices if in subprogram
Date: Fri, 17 Aug 2018 17:47:00 -0000
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kargl at gcc dot gnu.org
--- Comment #1 from kargl at gcc dot gnu.org ---
(In reply to Gavin Ridley from comment #0)
> If an array is allocated with indices that don't start at one, lbound and
> ubound seem to give incorrect answers if the array is passed to any
> subprogram. This program clearly illustrates the issue, compiled with no
> flags:
>
> program asdf
> use iso_fortran_env
> implicit none
> real(real64), dimension(-5:10) :: arr
> print *, 'lbound = ', lbound(arr)
> print *, 'ubound = ', ubound(arr)
> call boundprinter(arr)
>
> contains
> subroutine boundprinter(x)
> real(real64), intent(in), dimension(:) :: x
> print *, 'lbound = ', lbound(x)
> print *, 'ubound = ', ubound(x)
> endsubroutine boundprinter
> endprogram asdf
>
> Which prints:
>
> lbound = -5
> ubound = 10
> lbound = 1
> ubound = 16
>
> Shouldn't these be consistent?
>
> Very notably, it seems gcc 4 gives the correct answer, but not gcc 8.1.0.
> This bug causes segfaults in a program called MPACT developed by Oak Ridge
> National Lab and University of Michigan which I'd estimate somewhere between
> 50 and 100 people use. As a result of this, all of their compiles are still
> done on gcc 4.
I think you may have found a bug in your code.
F2003, 5.1.2.5.2, Assumed-shape array
An assumed-shape array is a nonpointer dummy argument array
that takes its shape from the associated actual argument array.
R514 assumed-shape-spec is [ lower-bound ] :
The rank is equal to the number of colons in the
assumed-shape-spec-list.
The extent of a dimension of an assumed-shape array dummy
argument is the extent of the corresponding dimension of
the associated actual argument array. If the lower bound
value is 'd' and the extent of the corresponding dimension
of the associated actual argument array is 's', then the
value of the upper bound is 's + d - 1'. The lower bound
is 'lower-bound', if present, and 1 otherwise.
Of course, I could be wrong.
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Subject: [Bug middle-end/86999] Incorrect code generation and missing optimization with -fno-signed-zeros.
Date: Fri, 17 Aug 2018 17:51:00 -0000
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
For the first problem -fno-signed-zeros is a bit of a red herring, the real
reason is enabling -fassociative-math makes GCC turn
return n * p + p;
to 'return (n + 1) * p;' and while we slightly optimize it on RTL we don't
recover fma from it.
For the second problem, the expression '(v4f)v' is {0.0f, 0.0f, -0.0f, -0.0f}
and by specifying -fno-signed-zeros you're allowing the compiler to change it
to all-positive-zeros, making the function a no-op. So that is not a bug.
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Subject: [Bug libstdc++/86963] std::tuple incorrectly assigned
Date: Fri, 17 Aug 2018 17:53:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Fri Aug 17 17:52:49 2018
New Revision: 263625
URL: https://gcc.gnu.org/viewcvs?rev=263625&root=gcc&view=rev
Log:
PR libstdc++/86963 Implement LWG 2729 constraints on tuple assignment
PR libstdc++/86963
* include/std/tuple (__tuple_base): New class template with deleted
copy assignment operator.
(tuple, tuple<_T1, _T2>): Derive from __tuple_base<tuple> so that
implicit copy/move assignment operator will be deleted/suppressed.
(tuple::__assignable, tuple<_T1, _T2>::__assignable): New helper
functions for SFINAE constraints on assignment operators.
(tuple::__nothrow_assignable, tuple<_T1, _T2>::__nothrow_assignable):
New helper functions for exception specifications.
(tuple::operator=(const tuple&), tuple::operator=(tuple&&))
(tuple<_T1, _T2>::operator=(const tuple&))
(tuple<_T1, _T2>::operator=(tuple&&)): Change parameter types to
__nonesuch_no_braces when the operator should be defined implicitly.
Use __nothrow_assignable for exception specifications.
(tuple::operator=(const tuple<_UElements...>&))
(tuple::operator=(tuple<_UElements...>&&))
(tuple<_T1, _T2>::operator=(const tuple<_U1, _U2>&))
(tuple<_T1, _T2>::operator=(tuple<_U1, _U2>&&))
(tuple<_T1, _T2>::operator=(const pair<_U1, _U2>&))
(tuple<_T1, _T2>::operator=(pair<_U1, _U2>&&)): Constrain using
__assignable and use __nothrow_assignable for exception
specifications.
* python/libstdcxx/v6/printers.py (is_specialization_of): Accept
gdb.Type as first argument, instead of a string.
(StdTuplePrinter._iterator._is_nonempty_tuple): New method to check
tuple for expected structure.
(StdTuplePrinter._iterator.__init__): Use _is_nonempty_tuple.
* testsuite/20_util/tuple/dr2729.cc: New test.
* testsuite/20_util/tuple/element_access/get_neg.cc: Change dg-error
to dg-prune-output.
Added:
trunk/libstdc++-v3/testsuite/20_util/tuple/dr2729.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/std/tuple
trunk/libstdc++-v3/python/libstdcxx/v6/printers.py
trunk/libstdc++-v3/testsuite/20_util/tuple/element_access/get_neg.cc
>From gcc-bugs-return-613035-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 18:34:07 2018
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From: "gavin.keith.ridley at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/87000] LBOUND and UBOUND give unexpected result for arrays without 1-based indices if in subprogram
Date: Fri, 17 Aug 2018 18:34:00 -0000
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--- Comment #2 from Gavin Ridley <gavin.keith.ridley at gmail dot com> ---
OK, I see, thank you. I believe you're right on that. When I tried to make this
example, I cut out an important part that seems to cause the difference between
gcc compiler versions. This code:
program asdf
use iso_fortran_env
implicit none
real(real64), dimension(:), allocatable :: arr
allocate(arr(-5:10))
print *, 'lbound = ', lbound(arr)
print *, 'ubound = ', ubound(arr)
call boundprinter(arr)
contains
subroutine boundprinter(x)
class(*), intent(in), dimension(:) :: x
print *, 'lbound = ', lbound(x)
print *, 'ubound = ', ubound(x)
endsubroutine boundprinter
endprogram asdf
Gives the difference I'm looking to illustrate. Insteady of specifying the type
of the array, this instead has the polymorphic class(*) which gives lbound=-5
on gcc 4.9.3 but gives lbound=1 on gcc 7.3.1. Which gcc is correct?
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Subject: [Bug libfortran/87000] LBOUND and UBOUND give unexpected result for arrays without 1-based indices if in subprogram
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--- Comment #3 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Fri, Aug 17, 2018 at 06:34:01PM +0000, gavin.keith.ridley at gmail dot com
wrote:
> OK, I see, thank you. I believe you're right on that. When I
> tried to make this example, I cut out an important part that
> seems to cause the difference between
> gcc compiler versions. This code:
>
> program asdf
> use iso_fortran_env
> implicit none
> real(real64), dimension(:), allocatable :: arr
> allocate(arr(-5:10))
> print *, 'lbound = ', lbound(arr)
> print *, 'ubound = ', ubound(arr)
> call boundprinter(arr)
>
> contains
> subroutine boundprinter(x)
> class(*), intent(in), dimension(:) :: x
> print *, 'lbound = ', lbound(x)
> print *, 'ubound = ', ubound(x)
> endsubroutine boundprinter
> endprogram asdf
>
> Gives the difference I'm looking to illustrate. Insteady of
> specifying the type of the array, this instead has the polymorphic
> class(*) which gives lbound=-5 on gcc 4.9.3 but gives lbound=1
> on gcc 7.3.1. Which gcc is correct?
Hmm, I don't use Fortran's OOP features such as CLASS(*), so
I don't know if there are different rules for CLASS(*) dummy
arguments. I would presume the F2003, 5.1.2.5.2, would still
hold in F2008 and later.
Just checked. F2008, 5.3.8.3, appears to be indentical to
F2003. So, I suspect that gcc 7.3.1 is correct. I'll that
or unlimited polymorphic variables (CLASS(*)) first appeared
in gfortran in 4.8.x, so the older version like had a bug.
>From gcc-bugs-return-613037-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 18:52:05 2018
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Subject: [Bug middle-end/86996] [9 regression] gcc.dg/tree-ssa/builtin-sprintf-warn-1.c FAILs
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-17
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed. On Solaris, wint_t is signed but on Linux it's unsigned, so
(wint_t)'\x80' (which is what the test uses) is treated differently between the
two. The failed assertion is fallout from the change to the sprintf pass
(r263612).
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Subject: [Bug c++/86998] Improve diagnostic for missing comma in template-parameter-list
Date: Fri, 17 Aug 2018 19:01:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #0)
> I don't know why all of GCC, Clang and EDG say something about a
> nested-name-specifier or qualified name for the first template-parameter. I
> don't think the grammar allows a qualified-id there, only a plain identifier.
It is allowed, when naming a non-type template parameter using a qualiflied-id
e.g.
template<typename T>
struct X {
template<typename T::U> struct Y { };
};
The rest of the PR still stands, we should add a fix-it for the comma.
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Subject: [Bug libstdc++/86963] std::tuple incorrectly assigned
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for GCC 9.
>From gcc-bugs-return-613040-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 19:33:46 2018
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Subject: [Bug bootstrap/81033] [8/9 Regression] there are cases where ld64 is not able to determine correct atom boundaries from the output GCC currently produces
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81033
--- Comment #44 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #43)
> (In reply to Iain Sandoe from comment #42)
> > (In reply to Elliot Saba from comment #41)
> > > Has there been any progress on this? We are running into this while trying
> > > to cross-compile GCC for Darwin. Has this been fixed in 8.3.0?
> >
> > I will be posting two patches (one just posted today) that are my proposed
> > solution - basically, v2 above plus removing a target hook.
>
> One is here: https://gcc.gnu.org/ml/gcc-patches/2018-08/msg00798.html
(this one still needs review from someone for the dwarf2out / final)
the other was
https://gcc.gnu.org/ml/gcc-patches/2018-08/msg00767.html
(approved and applied, will be backported soon)
>From gcc-bugs-return-613041-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 21:06:24 2018
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From: "snowfed at mail dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/80931] ICE on move_alloc in gimplify_expr, at gimplify.c:11335
Date: Fri, 17 Aug 2018 21:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80931
--- Comment #7 from snowfed <snowfed at mail dot ru> ---
Wow! Read your book with great pleasure! (the Russian translation of it)
(In reply to Arjen Markus from comment #6)
> Yes, I am :).
>
> Regards,
>
> Arjen
>
>From gcc-bugs-return-613042-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 21:18:25 2018
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From: "v.reshetnikov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87001] New: False error "expansion pattern 'x' contains no argument packs"
Date: Fri, 17 Aug 2018 21:18:00 -0000
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Bug ID: 87001
Summary: False error "expansion pattern 'x' contains no
argument packs"
Product: gcc
Version: 9.0
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/******************* BEGIN SOURCE *******************/
template<class... T>
struct X {
template<template<typeof(void(T))... x> class U>
struct Y {
template<typeof(void(T))... f>
using type = U<f...>;
};
};
/******************** END SOURCE ********************/
Or, without using the `typeof` extension, it can be written:
/******************* BEGIN SOURCE *******************/
template<class... T>
struct X {
template<template<void(...x)(T)> class U>
struct Y {
template<void(...f)(T)>
using type = U<f...>;
};
};
/******************** END SOURCE ********************/
There is an unexpected error:
<source>:6:28: error: expansion pattern 'x' contains no parameter packs
6 | using type = U<f...>;
| ^
Compiler returned: 1
For comparison, it compiles fine with Clang.
>From gcc-bugs-return-613043-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 21:59:04 2018
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Subject: [Bug middle-end/86996] [9 regression] gcc.dg/tree-ssa/builtin-sprintf-warn-1.c FAILs
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--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Fri Aug 17 21:58:27 2018
New Revision: 263636
URL: https://gcc.gnu.org/viewcvs?rev=263636&root=gcc&view=rev
Log:
PR testsuite/86996
gcc/testsuite/CHangeLog:
* gcc.dg/tree-ssa/builtin-sprintf-warn-1.c: Adjust.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-1.c
>From gcc-bugs-return-613044-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 21:59:20 2018
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Subject: [Bug testsuite/86996] [9 regression] gcc.dg/tree-ssa/builtin-sprintf-warn-1.c FAILs
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Component|middle-end |testsuite
Resolution|--- |FIXED
--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
Test adjusted in r263636.
>From gcc-bugs-return-613045-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 22:55:15 2018
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From: "tromey at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug jit/87002] New: allow integers larger than "long"
Date: Fri, 17 Aug 2018 22:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87002
Bug ID: 87002
Summary: allow integers larger than "long"
Product: gcc
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gcc-jit has gcc_jit_context_new_rvalue_from_int and
gcc_jit_context_new_rvalue_from_long, but on some platforms
long might be 32 bits, but a program could still use int64_t
or long long. I think gcc-jit should have an intmax_t function,
and perhaps uintmax_t as well.
>From gcc-bugs-return-613046-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 22:58:10 2018
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From: "tromey at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug jit/87003] New: use nonnull attribute in libgccjit.h
Date: Fri, 17 Aug 2018 22:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87003
Bug ID: 87003
Summary: use nonnull attribute in libgccjit.h
Product: gcc
Version: unknown
Status: UNCONFIRMED
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Component: jit
Assignee: dmalcolm at gcc dot gnu.org
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Many functions in libgccjit.h take a pointer argument,
and it isn't clear which of these can be NULL and which cannot.
It would be a bit helpful if the nonnull attribute were applied
where appropriate.
>From gcc-bugs-return-613047-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 23:00:57 2018
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From: "tromey at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug jit/87004] New: no way to mark a function as noreturn
Date: Fri, 17 Aug 2018 23:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87004
Bug ID: 87004
Summary: no way to mark a function as noreturn
Product: gcc
Version: unknown
Status: UNCONFIRMED
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Priority: P3
Component: jit
Assignee: dmalcolm at gcc dot gnu.org
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Currently all blocks must be terminated either with a jump or a return.
I think it should also be possible to terminate a block with
a call to a noreturn function. But, there is no way to indicate
that a function is noreturn.
>From gcc-bugs-return-613048-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 23:02:33 2018
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Subject: [Bug jit/87005] New: gcc_jit_context_get_builtin_function not documented
Date: Fri, 17 Aug 2018 23:02:00 -0000
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Bug ID: 87005
Summary: gcc_jit_context_get_builtin_function not documented
Product: gcc
Version: unknown
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Priority: P3
Component: jit
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The function gcc_jit_context_get_builtin_function is not documented.
>From gcc-bugs-return-613049-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 23:26:04 2018
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Subject: [Bug c/87006] New: Stack Protection with Large File support
Date: Fri, 17 Aug 2018 23:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87006
Bug ID: 87006
Summary: Stack Protection with Large File support
Product: gcc
Version: 5.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: tausrd at gmail dot com
Target Milestone: ---
Dear Sirs,
I would like to report a bug in:
gcc --version
gcc (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
When adding large file features :
#define _FILE_OFFSET_BITS 64
and gcc option :
-D_FILE_OFFSET_BITS=64
The program compiles ok, but when it runs : gets error "Smashed Stack Detected"
when doing "fclose" to a large file.
The error gets cleaned if I use "gcc ... -fno-stack-protector", but there is
no protection of stack.
I would prefer to have "stack protection enabled" always with large files
support.
Please, help me to fix this.
Best Regards,
Claudio SR
>From gcc-bugs-return-613050-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 17 23:51:23 2018
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Subject: [Bug target/87006] Stack Protection with Large File support
Date: Fri, 17 Aug 2018 23:51:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Component|c |target
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
You should report this to Ubuntu since it is their compiler.
Also do you have a full testcase which is causing the failure at runtime?
>From gcc-bugs-return-613051-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 07:57:46 2018
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Subject: [Bug target/87006] Stack Protection with Large File support
Date: Sat, 18 Aug 2018 07:57:00 -0000
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--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> ---
If you are looking for help in fixing your program you should ask on
gcc-help@gcc.gnu.org.
>From gcc-bugs-return-613052-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 08:37:10 2018
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Subject: [Bug target/86994] [9 regression] 64-bit gcc.target/i386/20040112-1.c FAILs
Date: Sat, 18 Aug 2018 08:37:00 -0000
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Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-18
CC| |law at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
It is r263591:
2018-08-16 Vlad Lazar <vlad.lazar@arm.com>
* expmed.h (canonicalize_comparison): New declaration.
* expmed.c (canonicalize_comparison, equivalent_cmp_code): New
function.
* expmed.c (emit_store_flag_1): Add call to canonicalize_comparison.
* optabs.c (prepare_cmp_insn): Likewise.
* rtl.h (unsigned_condition_p): New function which checks if a
comparison operator is unsigned.
That now expands with:
(insn 12 8 13 4 (set (reg:CCGC 17 flags)
(compare:CCGC (reg/v:QI 87 [ status ])
(const_int -1 [0xffffffffffffffff]))) "20040112-1.c":13 9
{*cmpqi_1}
(nil))
instead of:
(insn 10 8 11 4 (set (reg:CCGOC 17 flags)
(compare:CCGOC (reg/v:QI 87 [ status ])
(const_int 0 [0]))) "20040112-1.c":13 5 {*cmpqi_ccno_1}
(nil))
The canonicalization, introduced in r263591 does not universally benefit all
targets. I wonder why TARGET_CANONICALIZE_COMPARISON hook was not used instead.
>From gcc-bugs-return-613053-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 09:18:21 2018
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Subject: [Bug tree-optimization/86844] [8/9 regression] wrong code caused by store merging pass
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-18
CC| |ebotcazou at gcc dot gnu.org
Known to work| |7.3.1
Target Milestone|--- |8.3
Summary|wrong code generation |[8/9 regression] wrong code
|caused by store merging |caused by store merging
|pass |pass
Ever confirmed|0 |1
Known to fail| |8.2.1, 9.0
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Subject: [Bug target/86989] ICE in rs6000_output_addr_const_extra, at config/rs6000/rs6000.c:20994
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed|2018-08-17 00:00:00 |2018-08-18
Assignee|unassigned at gcc dot gnu.org |segher at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Confirmed. I have a patch.
>From gcc-bugs-return-613055-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 09:49:30 2018
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Subject: [Bug target/86987] ICE in simplify_binary_operation_1, at simplify-rtx.c:3515 on ppc64le
Date: Sat, 18 Aug 2018 09:49:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-613056-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 15:23:47 2018
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87007] New: [8/9 Regression] 10% slowdown with -march=skylake-avx512
Date: Sat, 18 Aug 2018 15:23:00 -0000
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Bug ID: 87007
Summary: [8/9 Regression] 10% slowdown with
-march=skylake-avx512
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: skpgkp1 at gmail dot com
Target Milestone: ---
Target: i386,x86-64
On Intel Skylake server, r262649 caused 10% slowdown for 538.imagick_r
in SPEC CPU 2017 when compiled with:
gcc -Ofast -march=skylake-avx512 -mfpmath=sse -fno-associative-math
-funroll-loops -flto
For
[hjl@gnu-cfl-1 skx-2]$ cat foo.i
extern float f;
extern double d;
extern int i;
void
foo (void)
{
d = f;
f = i;
}
r262649 turned on sse_partial_reg_dependency, which generates
vxorpd %xmm0, %xmm0, %xmm0
vcvtss2sd f(%rip), %xmm0, %xmm0
vmovsd %xmm0, d(%rip)
vxorps %xmm0, %xmm0, %xmm0
vcvtsi2ss i(%rip), %xmm0, %xmm0
vmovss %xmm0, f(%rip)
ret
instead of
vcvtss2sd f(%rip), %xmm0, %xmm0
vmovsd %xmm0, d(%rip)
vcvtsi2ss i(%rip), %xmm0, %xmm0
vmovss %xmm0, f(%rip)
ret
One "vxorpd %xmm0, %xmm0, %xmm0" is necessary. But both
vxorps %xmm0, %xmm0, %xmm0
and
vxorps %xmm0, %xmm0, %xmm0
are bad for performance.
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Subject: [Bug tree-optimization/87008] New: [8/9 Regression] gimple mem-to-mem assignment badly optimized
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87008
Bug ID: 87008
Summary: [8/9 Regression] gimple mem-to-mem assignment badly
optimized
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: glisse at gcc dot gnu.org
Target Milestone: ---
Created attachment 44554
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44554&action=edit
preprocessed testcase
Original testcase posted at
https://listengine.tuxfamily.org/lists.tuxfamily.org/eigen/2018/08/msg00012.html
#include <Eigen/Dense>
using Vec = Eigen::Matrix<double, 2, 1>;
Vec f ()
{
Vec sum = Vec::Zero();
for (int i = 0; i < 1024; ++i)
{
const Vec dirA = sum;
const Vec dirB = dirA;
sum += dirA.dot(dirB) * dirA;
}
return sum;
}
compiled on x86_64 with eigen 3.3.4, -DEIGEN_DONT_VECTORIZE -O3 .
The .optimized dump contains
MEM[(struct DenseStorage *)&dirA].m_data = MEM[(const struct DenseStorage
&)sum_5(D)].m_data;
dirA_18 = MEM[(struct plain_array *)&dirA];
dirA$8_3 = MEM[(struct plain_array *)&dirA + 8B];
MEM[(struct DenseStorage *)&dirB].m_data = MEM[(const struct DenseStorage
&)&dirA].m_data;
dirB_35 = MEM[(struct plain_array *)&dirB];
dirB$8_48 = MEM[(struct plain_array *)&dirB + 8B];
which translates to
movdqu (%rax), %xmm1
movaps %xmm1, -40(%rsp)
movsd -40(%rsp), %xmm2
movsd -32(%rsp), %xmm0
movaps %xmm1, -24(%rsp)
movsd -16(%rsp), %xmm1
movsd -24(%rsp), %xmm5
This is clearly quite bad, we should for instance CSE dirA_18 and dirB_35. This
is yet another case where gimple optimizers have a hard time handling
mem-to-mem assignment. I think we have relevant code in vn_reference_lookup_3
(case 5 in particular). ESRA used to help.
I would also have expected better from RTL optimization, but that may be too
optimistic.
>From gcc-bugs-return-613058-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 15:38:27 2018
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Subject: [Bug target/86994] [9 regression] 64-bit gcc.target/i386/20040112-1.c FAILs
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>The canonicalization, introduced in r263591 does not universally benefit all targets.
As mentioned in the thread, there is no canonicalization but there a checking
of the cost. If x86 cost model is incorrect, you would get the incorrect thing
here.
>From gcc-bugs-return-613059-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 16:18:46 2018
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Subject: [Bug target/87007] [8/9 Regression] 10% slowdown with -march=skylake-avx512
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H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 44555
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44555&action=edit
I am testing this patch
>From gcc-bugs-return-613060-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 17:31:00 2018
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Subject: [Bug tree-optimization/87009] New: Can't find XOR pattern applying De Morgan sequentially
Date: Sat, 18 Aug 2018 17:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87009
Bug ID: 87009
Summary: Can't find XOR pattern applying De Morgan sequentially
Product: gcc
Version: 9.0
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Priority: P3
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Optimization: -Ofast
Suggested debugging layout: https://godbolt.org/g/ERWctt
int xor_int(int a, int b) {
...
}
Don't work:
int x = ~(a|b);
return ~(x|a)|~(x|b);
return ~(~(a|b)|a)|~(~(a|b)|b);
int x = ~a&~b;
return ~((x|a)&(x|b));
return ~(((~a&~b)|a)&((~a&~b)|b));
int x = ~a&~b;
return ~(x|a)|~(x|b);
return ~((~a&~b)|a)|~((~a&~b)|b);
int x = ~a&~b;
return (~x&~a)|(~x&~b);
int x = ~a&~b;
return ~x&(~a|~b);
Those two work:
return (~(~a&~b)&~a)|(~(~a&~b)&~b);
return ~(~a&~b)&(~a|~b);
A different calculation:
Don't work:
return ~(~(~a&b)&~(a&~b));
return ~(~(~a|~b)|~(a|b));
return ~((a&b)|~(a|b));
This works:
return ~(a&b)&(a|b);
Different calculation:
return ~((a|~b)&(~a|b));
return ~(a|~b)|~(~a|b);
return (~a&b)|~(~a|b);
This works:
return (~a&b)|(a&~b);
SUGGESTED SOLUTTION
At match.pd:774 There's the De Morgan law
for bitwise AND but there isn't one for OR.
https://github.com/gcc-mirror/gcc/blob/fe4311f/gcc/match.pd#L774
No one noticed this, because it can (somehow) transform ~(~a|b) to a&~b
sometimes, (for example, if BMI instructions is enabled, it can use the 'andn'
instruction which calculates a&~b) If I understand it correctly, it only works
if it's not simplified a different way until RTL optimization comes.
/* ~(~a | b) --> a & ~b */
(simplify
(bit_not (bit_ior:cs (bit_not @0) @1))
(bit_and @0 (bit_not @1)))
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Subject: [Bug tree-optimization/87009] Can't find XOR pattern applying De Morgan sequentially
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--- Comment #1 from MCCCS <mcccs at gmx dot com> ---
Proposed patch:
Index: gcc/match.pd
===================================================================
--- gcc/match.pd (revision 263646)
+++ gcc/match.pd (working copy)
@@ -776,6 +776,11 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(bit_not (bit_and:cs (bit_not @0) @1))
(bit_ior @0 (bit_not @1)))
+/* ~(~a | b) --> a & ~b */
+(simplify
+ (bit_not (bit_ior:cs (bit_not @0) @1))
+ (bit_and @0 (bit_not @1)))
+
/* Simplify (~X & Y) to X ^ Y if we know that (X & ~Y) is 0. */
#if GIMPLE
(simplify
Index: gcc/testsuite/g++.dg/pr87009.C
===================================================================
--- gcc/testsuite/g++.dg/pr87009.C (nonexistent)
+++ gcc/testsuite/g++.dg/pr87009.C (working copy)
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-original" } */
+/* { dg-final { scan-tree-dump-times " ^ " 3 "original" } */
+
+int f1 (int x, int s)
+{
+ return ~(~(x|s)|x)|~(~(x|s)|s);
+}
+
+int f2 (int x, int s)
+{
+ return ~(~(~x&s)&~(x&~s));
+}
+
+int f3 (int x, int s)
+{
+ return ~((x|~s)&(~x|s));
+}
>From gcc-bugs-return-613062-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 17:58:53 2018
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Subject: [Bug tree-optimization/87009] Can't find XOR pattern applying De Morgan sequentially
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--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
Yes, there are still some transformations missing to canonicalize all binary
boolean functions. You mention ~(~a | b). We also need (a|~b)&(~a|b) and the
same with ^ in the middle. Possibly others (ideally, this list of
transformations would be generated by a computer, or at least more
systematically).
Posting a tested patch to the gcc-patches mailing list would be welcome.
>From gcc-bugs-return-613063-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 18:42:57 2018
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Subject: [Bug target/87010] New: FAIL: gcc.dg/torture/20180712-1.c -O1 (test for excess errors)
Date: Sat, 18 Aug 2018 18:42:00 -0000
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Bug ID: 87010
Summary: FAIL: gcc.dg/torture/20180712-1.c -O1 (test for
excess errors)
Product: gcc
Version: 9.0
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Host: hppa*-*-*
Target: hppa*-*-*
Build: hppa*-*-*
Executing on host: /test/gnu/gcc/objdir/gcc/xgcc -B/test/gnu/gcc/objdir/gcc/
/te
st/gnu/gcc/gcc/gcc/testsuite/gcc.dg/torture/20180712-1.c
-fno-diagnostics-show-
caret -fno-diagnostics-show-line-numbers -fdiagnostics-color=never -O1
-fPIC
-lm -o ./20180712-1.exe (timeout = 300)
spawn /test/gnu/gcc/objdir/gcc/xgcc -B/test/gnu/gcc/objdir/gcc/
/test/gnu/gcc/gc
c/gcc/testsuite/gcc.dg/torture/20180712-1.c -fno-diagnostics-show-caret
-fno-diagnostics-show-line-numbers -fdiagnostics-color=never -O1 -fPIC -lm -o
./20180712-1.exe
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/torture/20180712-1.c: In function 'foo':
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/torture/20180712-1.c:13:3: error: can't
find a register in class 'R1_REGS' while reloading 'asm'
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/torture/20180712-1.c:13:3: error: 'asm'
operand has impossible constraints
compiler exited with status 1
output is:
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/torture/20180712-1.c: In function 'foo':
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/torture/20180712-1.c:13:3: error: can't
find a register in class 'R1_REGS' while reloading 'asm'
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/torture/20180712-1.c:13:3: error: 'asm'
operand has impossible constraints
FAIL: gcc.dg/torture/20180712-1.c -O1 (test for excess errors)
Similar fails:
FAIL: gcc.dg/torture/20180712-1.c -O2 (test for excess errors)
UNRESOLVED: gcc.dg/torture/20180712-1.c -O2 compilation failed to produce
executable
FAIL: gcc.dg/torture/20180712-1.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none (test for excess errors)
UNRESOLVED: gcc.dg/torture/20180712-1.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none compilation failed to produce executable
FAIL: gcc.dg/torture/20180712-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects (test for excess errors)
UNRESOLVED: gcc.dg/torture/20180712-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects compilation failed to produce executable
FAIL: gcc.dg/torture/20180712-1.c -O3 -g (test for excess errors)
UNRESOLVED: gcc.dg/torture/20180712-1.c -O3 -g compilation failed to produce
executable
FAIL: gcc.dg/torture/20180712-1.c -Os (test for excess errors)
UNRESOLVED: gcc.dg/torture/20180712-1.c -Os compilation failed to produce
executable
Test passes at -O0.
I tend to think this test needs to be skipped on hppa because it generally
isn't possible for reload to handle the addresses of two or more symbols in
asm.
>From gcc-bugs-return-613064-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 20:05:35 2018
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From: "bernd.edlinger at hotmail dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/71625] missing strlen optimization on different array initialization style
Date: Sat, 18 Aug 2018 20:05:00 -0000
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Bernd Edlinger <bernd.edlinger at hotmail dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bernd.edlinger at hotmail dot de
--- Comment #20 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
it is possible that the poly type returns now a different type class
in __builtin_classify_type:
@defmac __builtin_classify_type (@var{object})
Since each machine has its own conventions for which data types are
passed in which kind of register, your implementation of @code{va_arg}
has to embody these conventions. The easiest way to categorize the
specified data type is to use @code{__builtin_classify_type} together
with @code{sizeof} and @code{__alignof__}.
@code{__builtin_classify_type} ignores the value of @var{object},
considering only its data type. It returns an integer describing what
kind of type that is---integer, floating, pointer, structure, and so on.
The file @file{typeclass.h} defines an enumeration that you can use to
interpret the values of @code{__builtin_classify_type}.
@end defmac
builtins.c-/* Used by expand_builtin_classify_type and
fold_builtin_classify_type. */
builtins.c-
builtins.c-static enum type_class
builtins.c-type_to_class (tree type)
builtins.c-{
builtins.c- switch (TREE_CODE (type))
builtins.c- {
builtins.c- case VOID_TYPE: return void_type_class;
builtins.c- case INTEGER_TYPE: return integer_type_class;
builtins.c- case ENUMERAL_TYPE: return enumeral_type_class;
builtins.c- case BOOLEAN_TYPE: return boolean_type_class;
builtins.c- case POINTER_TYPE: return pointer_type_class;
builtins.c- case REFERENCE_TYPE: return reference_type_class;
builtins.c- case OFFSET_TYPE: return offset_type_class;
builtins.c- case REAL_TYPE: return real_type_class;
builtins.c- case COMPLEX_TYPE: return complex_type_class;
builtins.c- case FUNCTION_TYPE: return function_type_class;
builtins.c- case METHOD_TYPE: return method_type_class;
builtins.c- case RECORD_TYPE: return record_type_class;
builtins.c- case UNION_TYPE:
builtins.c- case QUAL_UNION_TYPE: return union_type_class;
builtins.c: case ARRAY_TYPE: return (TYPE_STRING_FLAG (type)
builtins.c- ? string_type_class :
array_type_class);
builtins.c- case LANG_TYPE: return lang_type_class;
builtins.c- default: return no_type_class;
builtins.c- }
builtins.c-}
builtins.c-
builtins.c-/* Expand a call EXP to __builtin_classify_type. */
builtins.c-
builtins.c-static rtx
builtins.c-expand_builtin_classify_type (tree exp)
builtins.c-{
builtins.c- if (call_expr_nargs (exp))
builtins.c- return GEN_INT (type_to_class (TREE_TYPE (CALL_EXPR_ARG (exp,
0))));
builtins.c- return GEN_INT (no_type_class);
builtins.c-}
>From gcc-bugs-return-613065-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 21:54:45 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87011] New: [9 Regression] partially dead memset before strcpy not eliminated
Date: Sat, 18 Aug 2018 21:54:00 -0000
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Bug ID: 87011
Summary: [9 Regression] partially dead memset before strcpy not
eliminated
Product: gcc
Version: 9.0
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Priority: P3
Component: tree-optimization
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Target Milestone: ---
In released versions of GCC the memset call would be optimized by DSE to memset
(_6, 0, 12). On trunk, however, this is not done:
$ cat f.c && gcc -O2 -S -Wall -fdump-tree-optimized=/dev/stdout f.c
struct S { char a[4]; void (*pf)(void); };
void f (struct S *p)
{
__builtin_memset (p, 0, sizeof *p);
__builtin_strcpy (p->a, "123");
}
;; dump 228: optimized (enabled by -ftree-optimized)
;; Function f (f, funcdef_no=0, decl_uid=1910, cgraph_uid=1, symbol_order=0)
f (struct S * p)
{
char[4] * _1;
<bb 2> [local count: 1073741825]:
__builtin_memset (p_3(D), 0, 16);
_1 = &p_3(D)->a;
__builtin_memcpy (_1, "123", 4); [tail call]
return;
}
>From gcc-bugs-return-613066-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 22:19:27 2018
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Subject: [Bug tree-optimization/87011] [9 Regression] partially dead memset before strcpy not eliminated
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
CC| |law at gcc dot gnu.org
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Bisection points to r262841:
r262841 | law | 2018-07-17 19:54:10 -0400 (Tue, 17 Jul 2018) | 2 lines
PR tree-optimization/86010
* tree-ssa-dse.c (compute_trims): Fix typo/thinko.
The optimization was introduced in r245688 (in GCC 7).
>From gcc-bugs-return-613067-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 23:07:19 2018
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Subject: [Bug c++/81721] precompiled header : internal compiler error: Segmentation fault
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bonzini at gnu dot org,
| |geoffk at gcc dot gnu.org,
| |jsm28 at gcc dot gnu.org
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Juro Bystricky from comment #0)
>
> After some debugging, I found the segmentation fault was caused in
> libcpp/lex.c (cpp_spell_token):
>
> case SPELL_IDENT:
> if (forstring)
> {
> memcpy (buffer, NODE_NAME (token->val.node.spelling),
> NODE_LEN (token->val.node.spelling));
> buffer += NODE_LEN (token->val.node.spelling);
> }
>
svn blame for that part shows:
82199 bonzini case SPELL_IDENT:
96333 geoffk if (forstring)
96333 geoffk {
217202 jsm28 memcpy (buffer, NODE_NAME (token->val.node.spelling),
217202 jsm28 NODE_LEN (token->val.node.spelling));
217202 jsm28 buffer += NODE_LEN (token->val.node.spelling);
96333 geoffk }
cc-ing them.
>From gcc-bugs-return-613068-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 23:09:32 2018
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Subject: [Bug c++/81830] missing Wunused-local-typedef on a typedef of an unnamed enum or struct
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
>From gcc-bugs-return-613069-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 23:37:54 2018
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Subject: [Bug c++/86981] Add Clang's -Wpessimizing-move warning
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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>From gcc-bugs-return-613070-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 18 23:46:16 2018
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Subject: [Bug c++/86982] Make -Wreturn-local-addr know about std::move and std::forward
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----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-18
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Ever confirmed|0 |1
>From gcc-bugs-return-613071-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 03:01:47 2018
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Subject: [Bug c++/87012] New: [Regression] ICE in verify_unstripped_args_1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87012
Bug ID: 87012
Summary: [Regression] ICE in verify_unstripped_args_1
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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/***************** BEGIN SOURCE *****************/
template<class T>
using ref = T&;
int x;
template<template<class> class T, T<int>>
struct X { };
struct Y : X<ref, x> { };
/****************** END SOURCE ******************/
<source>: In instantiation of 'struct X<ref, x>':
<source>:9:12: required from here
<source>:7:10: internal compiler error: in verify_unstripped_args_1, at
cp/pt.c:1155
7 | struct X { };
| ^
Compiler returned: 1
Compiles fine with GCC 8.2 and Clang.
>From gcc-bugs-return-613072-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 05:49:26 2018
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Subject: [Bug bootstrap/87013] New: xgcc: fatal error: no input files
Date: Sun, 19 Aug 2018 05:49:00 -0000
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Bug ID: 87013
Summary: xgcc: fatal error: no input files
Product: gcc
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config.log of gcc-8.2.0-compiled\sparc-linux\libgcc
he exact version of GCC:
gcc-8.2.0
the system type:
NetgearReadyNAS Duo
(http://wiki.dietpc.org/index.php/DIET-PC_on_SPARC_ReadyNAS)
the options given when GCC was configured/built:
../gcc-8.2.0/configure --prefix=/opt/gcc-8.2/ --enable-languages=c,c++,go
--with-mpc=/usr/local --with-mpfr=/usr/local --with-gmp=/usr/local
--with-isl=/usr/local/ --disable-doc --host=sparc-linux --build=sparc-linux
--disable-libstdcxx-pch --disable-linux-futex --disable-libsanitizer
--disable-libcilkrts --disable-libitm --disable-libitm CC=/opt/gcc-7.3/bin/gcc
CXX=/opt/gcc-7.3/bin/g++ && /usr/local/bin/make
## --------- ##
## Platform. ##
## --------- ##
hostname = nas-02-90-38
uname -m = padre
uname -r = 2.6.17.14ReadyNAS
uname -s = Linux
uname -v = #1 Wed Jun 20 20:08:20 PDT 2012
the complete command line that triggers the bug;
/usr/local/bin/make
the compiler output (error messages, warnings, etc.);
[...]
esac
mv tmp2-tm.texi tmp-tm.texi
/bin/sh ../../gcc-8.2.0/gcc/../move-if-change tmp-tm.texi tm.texi
if [ xinfo = xinfo ]; then \
makeinfo --split-size=5000000 --split-size=5000000 --split-size=5000000
--no-split -I . -I ../../gcc-8.2.0/gcc/doc \
-I ../../gcc-8.2.0/gcc/doc/include -o doc/gccint.info
../../gcc-8.2.0/gcc/doc/gccint.texi; \
fi
if [ xinfo = xinfo ]; then \
makeinfo --split-size=5000000 --split-size=5000000 --split-size=5000000
--no-split -I ../../gcc-8.2.0/gcc/doc \
-I ../../gcc-8.2.0/gcc/doc/include -o doc/gccinstall.info
../../gcc-8.2.0/gcc/doc/install.texi; \
fi
if [ xinfo = xinfo ]; then \
makeinfo --split-size=5000000 --split-size=5000000 --split-size=5000000
--no-split -I . -I ../../gcc-8.2.0/gcc/doc \
-I ../../gcc-8.2.0/gcc/doc/include -o doc/cppinternals.info
../../gcc-8.2.0/gcc/doc/cppinternals.texi; \
fi
echo timestamp > gcc.pod
perl ../../gcc-8.2.0/gcc/../contrib/texi2pod.pl
../../gcc-8.2.0/gcc/doc/invoke.texi > gcc.pod
echo timestamp > doc/gcc.1
(pod2man --center="GNU" --release="gcc-8.2.0" --date=2018-07-26 --section=1
gcc.pod > doc/gcc.1.T$$ && \
mv -f doc/gcc.1.T$$ doc/gcc.1) || \
(rm -f doc/gcc.1.T$$ && exit 1)
cp doc/gcc.1 doc/g++.1
/media/gcc-8.2.0-compiled/./gcc/xgcc -B/media/gcc-8.2.0-compiled/./gcc/ -xc
-nostdinc /dev/null -S -o /dev/null
-fself-test=../../gcc-8.2.0/gcc/testsuite/selftests
-fself-test: 40032 pass(es) in 7.230000 seconds
echo timestamp > s-selftest-c
rm gcc.pod
make[3]: Leaving directory '/c/media/gcc-8.2.0-compiled/gcc'
mkdir -p -- sparc-linux/libgcc
Checking multilib configuration for libgcc...
Configuring stage 1 in sparc-linux/libgcc
configure: creating cache ./config.cache
checking build system type... sparc-unknown-linux-gnu
checking host system type... sparc-unknown-linux-gnu
checking for --enable-version-specific-runtime-libs... no
checking for a BSD-compatible install... /usr/bin/install -c
checking for gawk... mawk
checking for sparc-linux-ar... ar
checking for sparc-linux-lipo... lipo
checking for sparc-linux-nm... /media/gcc-8.2.0-compiled/./gcc/nm
checking for sparc-linux-ranlib... ranlib
checking for sparc-linux-strip... strip
checking whether ln -s works... yes
checking for sparc-linux-gcc... /media/gcc-8.2.0-compiled/./gcc/xgcc
-B/media/gcc-8.2.0-compiled/./gcc/ -B/opt/gcc-8.2/sparc-linux/bin/
-B/opt/gcc-8.2/sparc-linux/lib/ -isystem /opt/gcc-8.2/sparc-linux/include
-isystem /opt/gcc-8.2/sparc-linux/sys-include
checking for suffix of object files... configure: error: in
`/media/gcc-8.2.0-compiled/sparc-linux/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.
make[2]: *** [Makefile:18005: configure-stage1-target-libgcc] Error 1
make[2]: Leaving directory '/c/media/gcc-8.2.0-compiled'
make[1]: *** [Makefile:23279: stage1-bubble] Error 2
make[1]: Leaving directory '/c/media/gcc-8.2.0-compiled'
make: *** [Makefile:941: all] Error 2
>From gcc-bugs-return-613073-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 07:21:53 2018
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Subject: [Bug middle-end/86999] Incorrect code generation and missing optimization with -fno-signed-zeros.
Date: Sun, 19 Aug 2018 07:21:00 -0000
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--- Comment #2 from asd_ <asd0025 at gmail dot com> ---
(In reply to Alexander Monakov from comment #1)
> For the first problem -fno-signed-zeros is a bit of a red herring, the real
> reason is enabling -fassociative-math makes GCC turn
>
> return n * p + p;
>
> to 'return (n + 1) * p;' and while we slightly optimize it on RTL we don't
> recover fma from it.
>
> For the second problem, the expression '(v4f)v' is {0.0f, 0.0f, -0.0f,
> -0.0f} and by specifying -fno-signed-zeros you're allowing the compiler to
> change it to all-positive-zeros, making the function a no-op. So that is not
> a bug.
Thanks for the explanation!
I hope there will be one more FMA pass in the RTL stages in the future.:)
>From gcc-bugs-return-613074-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 07:28:36 2018
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Subject: [Bug target/87014] New: [x32] __builtin_eh_return should use 64-bit mov to set return address
Date: Sun, 19 Aug 2018 07:28:00 -0000
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Bug ID: 87014
Summary: [x32] __builtin_eh_return should use 64-bit mov to set
return address
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long offset;
void* ptr;
void f(void)
{
__builtin_eh_return(offset,ptr);
}
with gcc -mx32 produces (gcc (Gentoo Hardened 7.3.0-r3 p1.4) 7.3.0)
f:
pushq %rbp
movl %esp, %ebp
pushq %rdx
pushq %rax
movl %fs:24, %eax
movl %eax, -20(%ebp)
xorl %eax, %eax
movl ptr(%rip), %eax
movl offset(%rip), %edx
movl %edx, %ecx
movl %eax, 8(%ebp,%ecx) # !
movq -16(%ebp), %rax
movq -8(%ebp), %rdx
leal 8(%rbp,%rcx), %ecx
movl 0(%ebp), %ebp
movl %ecx, %esp
ret # !!
Since the upper half of the return address is not cleared this can lead to
SIGSEGV in _Unwind_*
>From gcc-bugs-return-613075-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 07:32:28 2018
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Subject: [Bug target/87014] [x32] __builtin_eh_return should use 64-bit mov to set return address
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--- Comment #1 from camper <theonetruecamper at gmx dot de> ---
Created attachment 44557
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44557&action=edit
[x32] use 64-bit mov to set return address in eh_return
compiles to:
movl handler(%rip), %eax
movl offset(%rip), %edx
movl %edx, %ecx
movl %eax, %eax
movq %rax, 8(%ebp,%ecx)
movq -16(%ebp), %rax
movq -8(%ebp), %rdx
leal 8(%rbp,%rcx), %ecx
movl 0(%ebp), %ebp
movl %ecx, %esp
ret
>From gcc-bugs-return-613076-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 07:44:42 2018
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Subject: [Bug c++/86911] [9 Regression] ICE in gcc/c-family/c-indentation.c:403
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to David Malcolm from comment #3)
> Does r263595 fix the issue? (it relates to having stray carriage returns
> somewhere above in the file, leading to line-numbering becoming confused)
Yes, I can confirm that. Thanks David.
>From gcc-bugs-return-613077-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 08:12:30 2018
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Subject: [Bug debug/83941] Debug info generated with -flto contains useless forwarders
Date: Sun, 19 Aug 2018 08:12:00 -0000
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--- Comment #5 from dpeeters at outlook dot be ---
Yes, but please have a look at https://www.datingvergelijken.be first. It's a
great datingsite in Belgium.
Thanks,
Dirk
>From gcc-bugs-return-613078-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 08:22:55 2018
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Subject: [Bug target/52795] FAIL: gcc.dg/tree-prof/pr34999.c compilation, -fprofile-use -D_PROFILE_USE on {x86_64,i386}-apple-darwin{10,11} at -m64
Date: Sun, 19 Aug 2018 08:22:00 -0000
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Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=81033
--- Comment #9 from Iain Sandoe <iains at gcc dot gnu.org> ---
The fix attached to 81033 also resolves this issue, and is much less intrusive
than #c6 (which is no longer applicable - obsoleted).
>From gcc-bugs-return-613079-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 08:31:08 2018
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Subject: [Bug middle-end/86999] Incorrect code generation and missing optimization with -fno-signed-zeros.
Date: Sun, 19 Aug 2018 08:31:00 -0000
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--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to asd_ from comment #2)
> I hope there will be one more FMA pass in the RTL stages in the future.:)
A new RTL pass is not necessary for this, the GIMPLE pass could be extended to
recognize (x±1)*y and (1-x)*y, if that's useful.
>From gcc-bugs-return-613080-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 13:27:20 2018
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Subject: [Bug c++/87012] [Regression] ICE in verify_unstripped_args_1
Date: Sun, 19 Aug 2018 13:27:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-19
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r241425. Before that we issued an error:
87012.C: In instantiation of ‘struct X<ref, x>’:
87012.C:9:12: required from here
87012.C:7:10: error: type/value mismatch at argument 1 in template parameter
list for ‘template<template<class> class T, T<int> <anonymous> > struct X’
struct X { };
^
87012.C:7:10: note: expected a class template, got ‘ref’
87012.C:7:10: note: invalid template non-type parameter
87012.C:7:10: error: type/value mismatch at argument 1 in template parameter
list for ‘X<T, <anonymous> >::X’
87012.C:7:10: note: expected a class template, got ‘ref’
87012.C:7:10: note: invalid template non-type parameter
>From gcc-bugs-return-613081-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 13:27:38 2018
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Subject: [Bug c++/87012] [Regression] ICE in verify_unstripped_args_1
Date: Sun, 19 Aug 2018 13:27:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
But the code seems to be valid.
>From gcc-bugs-return-613082-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 15:29:44 2018
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From: "daniel.f.starke at freenet dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87015] New: [8 Regression] miscompilation of template heavy Boost Spirit code
Date: Sun, 19 Aug 2018 15:29:00 -0000
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Bug ID: 87015
Summary: [8 Regression] miscompilation of template heavy Boost
Spirit code
Product: gcc
Version: 8.1.0
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Reporter: daniel.f.starke at freenet dot de
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Starting with GCC 8.1.0 I encounter wrong code generations when using template
heavy C++ code with Boost Spirit. Using Boost 1.66 with GCC 7.2.0, 7.3.0, 8.1.0
and 8.2.0 to compile https://github.com/daniel-starke/pp results in the
following test case results of pp:
7.2.0
TOTAL: 767
PASSED: 767
FAILED: 0
7.3.0
TOTAL: 767
PASSED: 767
FAILED: 0
8.1.0
TOTAL: 760
PASSED: 140
FAILED: 620
8.2.0
TOTAL: 760
PASSED: 140
FAILED: 620
Tests with GCC8.2.0 did show that some errors occur because the string
terminator _r2 in
https://github.com/daniel-starke/pp/blob/master/src/pp/parser/Script.hpp#L396
does gets propergated to
https://github.com/daniel-starke/pp/blob/master/src/pp/parser/StringLiteral.hpp#L226
but not properly set.
GCC 8.2.0 was configured with:
../../src/gcc-8.2.0/configure --host=x86_64-w64-mingw32
--enable-languages=c,c++ --enable-seh-exceptions --enable-threads=posix
--disable-nls --disable-shared --enable-static --enable-fully-dynamic-string
--enable-lto --enable-plugins --enable-libgomp --with-dwarf2
--enable-mingw-wildcard=platform --disable-win32-registry
--enable-version-specific-runtime-libs --prefix=/mingw64-64
--with-sysroot=/mingw64-64 --target=x86_64-w64-mingw32 --enable-targets=all
--enable-checking=release --with-gmp=/usr/new-gcc/lib/gmp-5.0.5
--with-mpfr=/usr/new-gcc/lib/mpfr-2.4.2 --with-mpc=/usr/new-gcc/lib/mpc-0.9
--with-isl=/usr/new-gcc/lib/isl-0.18 --with-cloog=/usr/new-gcc/lib/cloog-0.18.4
--with-host-libstdcxx='-lstdc++ -lsupc++' --disable-cloog-version-check
--enable-cloog-backend=isl
Thread model: posix
It is available here: https://sourceforge.net/projects/gcc-win64/files/8.2.0/
Due to the nature of the bug I am unable to provide a reduced test case without
an better idea of what the cause of the issue is. Compiling with -Og or -O1
instead of -O2 did not change the behavior.
>From gcc-bugs-return-613083-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 17:56:55 2018
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Subject: [Bug target/87014] [x32] __builtin_eh_return should use 64-bit mov to set return address
Date: Sun, 19 Aug 2018 17:56:00 -0000
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
> movl %eax, 8(%ebp,%ecx) # !
This is a 32bit zero extending load.
>From gcc-bugs-return-613084-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 17:58:37 2018
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Subject: [Bug target/87014] [x32] __builtin_eh_return should use 64-bit mov to set return address
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> > movl %eax, 8(%ebp,%ecx) # !
>
> This is a 32bit zero extending load.
Meaning the top 32bits of the rax register are zero.
>From gcc-bugs-return-613085-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 18:11:43 2018
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Subject: [Bug target/87014] [x32] __builtin_eh_return should use 64-bit mov to set return address
Date: Sun, 19 Aug 2018 18:11:00 -0000
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--- Comment #4 from Andreas Schwab <schwab@linux-m68k.org> ---
It's a 32bit store, not a load.
>From gcc-bugs-return-613086-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 19:11:15 2018
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Subject: [Bug target/86994] [9 regression] 64-bit gcc.target/i386/20040112-1.c FAILs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86994
--- Comment #3 from uros at gcc dot gnu.org ---
Author: uros
Date: Sun Aug 19 19:10:37 2018
New Revision: 263652
URL: https://gcc.gnu.org/viewcvs?rev=263652&root=gcc&view=rev
Log:
PR target/86994
* config/i386/i386.c (ix86_rtx_costs) [case SET]: Check source for
register_operand when calling ix86_set_reg_reg_cost.
[case CONST_INT, case CONST, case LABEL_REF, case SYMBOL_REF]:
Set *total to 0 for operands that satisfy x86_64_immediate_operand
predicate and to 1 otherwise.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.c
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Subject: [Bug target/86994] [9 regression] 64-bit gcc.target/i386/20040112-1.c FAILs
Date: Sun, 19 Aug 2018 19:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86994
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Assignee|unassigned at gcc dot gnu.org |ubizjak at gmail dot com
--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
Fixed.
>From gcc-bugs-return-613088-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Aug 19 20:09:53 2018
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From: "bobogu at atlas dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87016] New: std::optional::operator= in constexpr context
Date: Sun, 19 Aug 2018 20:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87016
Bug ID: 87016
Summary: std::optional::operator= in constexpr context
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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Created attachment 44558
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44558&action=edit
preprocessed TU
According to the standard, there is no assignment operator that should work in
a constexpr context, however, I am able to successfully compile and use the
following snippet:
// gcc -lstdc++ -std=c++17 main.cpp @Linux laptop 4.17.11-arch1 x86_64
constexpr std::optional<int> foo() {
std::optional<int> bar = 3;
bar = 10;
return bar;
}
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From: "development@faf-ltd.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87017] New: vector must have the same value as its allocator
Date: Sun, 19 Aug 2018 22:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87017
Bug ID: 87017
Summary: vector must have the same value as its allocator
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
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Priority: P3
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This MCVE compiles/runs with gcc 7.3, clang 6.0 and icc 18.0 [this is, what I
tested so far]:
#include <regex>
#include <string>
#include <iostream>
namespace FaF
{
template <typename T>
class Allocator
{
public:
typedef T value_type;
Allocator() throw() {}
template <typename U> Allocator (const Allocator<U>&) throw() {}
~Allocator() throw() {}
T* allocate (std::size_t num, const void* hint = 0)
{
(void) hint; (void) num;
return new ( T );
}
void deallocate (T* p, std::size_t num) { (void) num; (void) p; }
};
using string = std::basic_string<char, std::char_traits<char>,
Allocator<char>>;
using smatch = std::match_results<FaF::string::const_iterator,
Allocator<FaF::string::const_iterator>>;
}
int main()
{
FaF::smatch results {};
std::cout << "OK\n";
}
gcc 8.2 complains here:
FaF::smatch results {};
^--- vector must have the same value as its allocator
Changing it to std::smatch then it compiles.
Compiler options:
-O3 -std=c++17 -Werror -Wextra -Wold-style-cast -Wall
Live version: https://godbolt.org/z/8wI6YS
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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/87018] New: [9 Regression] Boostrap failure on AIX
Date: Sun, 19 Aug 2018 22:14:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87018
Bug ID: 87018
Summary: [9 Regression] Boostrap failure on AIX
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: tkoenig at gcc dot gnu.org
Target Milestone: ---
Created attachment 44559
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44559&action=edit
config.log from failed build
This is on gcc119.fsffrance.org, in case anybody wants to
reproduce. Files are in /home/tkoenig/trunk (source directory) and
/home/tkoenig/trunk-bin (build-directory).
Trying, from the build-directory, to run the shell script
PATH=/opt/freeware/bin:$PATH
../trunk/configure --disable-werror --enable-languages=c,c++,fortran
--with-gmp=/opt/cfarm --with-libiconv-prefix=/opt/cfarm --disable-libstdcxx-pch
--with-included-gettext --prefix=$HOME
make -j32 SHELL=/bin/bash CONFIG_SHELL=/bin/bash
yields the error
In file included from ../../trunk/intl/plural.y:35:0:
../../trunk/intl/plural-exp.h:102:23: error: conflicting types for
'libintl_gettextparse'
# define PLURAL_PARSE libintl_gettextparse
^
../../trunk/intl/plural.y:40:25: note: in expansion of macro 'PLURAL_PARSE'
# define __gettextparse PLURAL_PARSE
^~~~~~~~~~~~
plural.c:184:5: note: in expansion of macro '__gettextparse'
int __gettextparse (void);
^~~~~~~~~~~~~~
../../trunk/intl/plural-exp.h:102:23: note: previous declaration of
'libintl_gettextparse' was here
# define PLURAL_PARSE libintl_gettextparse
^
../../trunk/intl/plural-exp.h:114:12: note: in expansion of macro
'PLURAL_PARSE'
extern int PLURAL_PARSE PARAMS ((void *arg));
^~~~~~~~~~~~
../../trunk/intl/plural-exp.h:102:23: error: conflicting types for
'libintl_gettextparse'
# define PLURAL_PARSE libintl_gettextparse
^
../../trunk/intl/plural.y:40:25: note: in expansion of macro 'PLURAL_PARSE'
# define __gettextparse PLURAL_PARSE
^~~~~~~~~~~~
plural.c:63:25: note: in expansion of macro '__gettextparse'
#define yyparse __gettextparse
^~~~~~~~~~~~~~
plural.c:1129:1: note: in expansion of macro 'yyparse'
yyparse (void)
^~~~~~~
../../trunk/intl/plural-exp.h:102:23: note: previous declaration of
'libintl_gettextparse' was here
# define PLURAL_PARSE libintl_gettextparse
^
../../trunk/intl/plural-exp.h:114:12: note: in expansion of macro
'PLURAL_PARSE'
extern int PLURAL_PARSE PARAMS ((void *arg));
^~~~~~~~~~~~
plural.c: In function 'libintl_gettextparse':
plural.c:64:25: error: too few arguments to function '__gettextlex'
#define yylex __gettextlex
^
plural.c:1298:16: note: in expansion of macro 'yylex'
yychar = yylex (&yylval);
^~~~~
plural.c:64:25: note: declared here
#define yylex __gettextlex
^
../../trunk/intl/plural.y:69:12: note: in expansion of macro 'yylex'
static int yylex PARAMS ((YYSTYPE *lval, const char **pexp));
^~~~~
../../trunk/intl/plural.y:178:29: error: 'arg' undeclared (first use in this
function)
((struct parse_args *) arg)->res = $1;
^~~
../../trunk/intl/plural.y:178:29: note: each undeclared identifier is reported
only once for each function it appears in
Makefile:133: recipe for target 'plural.o' failed
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From: "welttensor at web dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/87019] New: ICE: Static member of derived type, organized in coarray accessed
Date: Sun, 19 Aug 2018 22:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87019
Bug ID: 87019
Summary: ICE: Static member of derived type, organized in
coarray accessed
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
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Created attachment 44560
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44560&action=edit
main and foo_module
When inside of member routine (foo_routine) of a derived type (foo_type) a
member-variable (foo_member) is accessed from a remote image, an internal
compiler error is produced.
This problem exists already in older versions of gfortran like 6.3 as well as
8.2.1
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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/87018] [9 Regression] Boostrap failure on AIX
Date: Sun, 19 Aug 2018 22:23:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
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From: "roland at rschulz dot eu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/87020] New: comparison operator isn't called for stateless allocator without is_always_equal for C++11/14
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Product: gcc
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Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: roland at rschulz dot eu
Target Milestone: ---
For an empty allocator the comparison operators aren't used, unless
is_always_equal=std::false_type is present. This is the correct behavior with
C++17 but for C++11/14 is_always_equal shouldn't have any effect.
This is low impact because any well defined and state-less allocator should
always be equal. But it isn't strictly compliant. This is present since GCC 6.
Reproducer:
https://godbolt.org/z/-5IHwC
>From gcc-bugs-return-613094-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 01:21:45 2018
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Subject: [Bug target/87021] New: New powerpc test cases from r263570 fail
Date: Mon, 20 Aug 2018 01:21:00 -0000
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Bug ID: 87021
Summary: New powerpc test cases from r263570 fail
Product: gcc
Version: 9.0
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r263570 | willschm | 2018-08-15 15:29:04 -0500 (Wed, 15 Aug 2018) | 11 lines
[testsuite]
2018-08-13 Will Schmidt <will_schmidt@vnet.ibm.com>
* gcc.target/powerpc/fold-vec-splat-char.c: New.
* gcc.target/powerpc/fold-vec-splat-floatdouble.c: New.
* gcc.target/powerpc/fold-vec-splat-int.c: New.
* gcc.target/powerpc/fold-vec-splat-longlong.c: New.
* gcc.target/powerpc/fold-vec-splat-pixel.c: New.
* gcc.target/powerpc/fold-vec-splat-short.c: New.
FAIL: gcc.target/powerpc/fold-vec-splat-char.c scan-assembler-times vspltb 24
FAIL: gcc.target/powerpc/fold-vec-splat-floatdouble.c scan-assembler-times
vspltw|xxspltw 9
FAIL: gcc.target/powerpc/fold-vec-splat-floatdouble.c scan-assembler-times
xxpermdi 9
FAIL: gcc.target/powerpc/fold-vec-splat-int.c scan-assembler-times vspltisw 6
FAIL: gcc.target/powerpc/fold-vec-splat-int.c scan-assembler-times
vspltw|xxspltw 24
FAIL: gcc.target/powerpc/fold-vec-splat-pixel.c scan-assembler-times vsplth 8
FAIL: gcc.target/powerpc/fold-vec-splat-pixel.c scan-assembler-times vspltish 2
FAIL: gcc.target/powerpc/fold-vec-splat-short.c scan-assembler-times vsplth 24
FAIL: gcc.target/powerpc/fold-vec-splat-short.c scan-assembler-times vspltish 6
These fail on power 8 (and probably 7).
>From gcc-bugs-return-613095-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 01:54:27 2018
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From: "helloqirun at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87022] New: GCC miscompiles at -O3 on valid code
Date: Mon, 20 Aug 2018 01:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87022
Bug ID: 87022
Summary: GCC miscompiles at -O3 on valid code
Product: gcc
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It also affects gcc-8.1 at -O3. gcc-7.3 works fine.
It appears that it starts at r253679.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 9.0.0 20180819 (experimental) [trunk revision 263651] (GCC)
$ gcc-trunk abc.c ; ./a.out > ref.txt
$ gcc-trunk -O3 abc.c ; ./a.out > a.txt
$ diff ref.txt a.txt
25,49c25,49
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
---
> 1
> 1
> 1
> 1
> 0
> 0
> 1
> 1
> 1
> 1
> 1
> 0
> 0
> 1
> 1
> 1
> 1
> 1
> 0
> 0
> 1
> 1
> 1
> 1
> 1
$ gcc-7.3 -O3 abc.c ; ./a.out > a.txt
$ diff ref.txt a.txt
$
$ cat abc.c
void printf();
char a[7];
char b[10][7];
short c;
int d, e, f, g;
int main() {
for (; d <= 4; d++) {
e = 0;
for (; e <= 6; e++) {
if (a[c])
b[e + 3][d + 2] = 1;
a[0] = 5;
b[e][d + 2] = 0;
}
}
for (; f < 10; f++) {
g = 0;
for (; g < 7; g++)
printf("%d\n", b[f][g]);
}
}
>From gcc-bugs-return-613096-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 03:04:50 2018
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From: "He.Hongjun at zte dot com.cn" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87023] New: It's almost false, when c_fully_fold_internal deal with C_MAYBE_CONST_EXPR.
Date: Mon, 20 Aug 2018 03:04:00 -0000
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Bug ID: 87023
Summary: It's almost false, when c_fully_fold_internal deal
with C_MAYBE_CONST_EXPR.
Product: gcc
Version: unknown
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in c_fully_fold_internal, C_MAYBE_CONST_EXPR's initial value is false. later,
using add operations, it's value is always false.
1. initial value
if (C_MAYBE_CONST_EXPR_INT_OPERANDS (expr))
{
*maybe_const_itself = false; // the initial value is false
inner = c_fully_fold_internal (inner, in_init, maybe_const_operands,
maybe_const_itself, true);
}
2. add operations
*maybe_const_itself &= op0_const_self;
*maybe_const_itself &= op1_const_self;
*maybe_const_itself &= op2_const_self;
Whether the initial value should be true?
>From gcc-bugs-return-613097-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 05:23:49 2018
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Subject: [Bug tree-optimization/87022] [8/9 Regression] miscompilation with -ftree-loop-distribution
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87022
Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
CC| |amker at gcc dot gnu.org,
| |amonakov at gcc dot gnu.org
Summary|GCC miscompiles at -O3 on |[8/9 Regression]
|valid code |miscompilation with
| |-ftree-loop-distribution
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Yep, -O2 -ftree-loop-distribution is enough to trigger miscompilation.
>From gcc-bugs-return-613098-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 05:42:50 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87022] [8/9 Regression] miscompilation with -ftree-loop-distribution
Date: Mon, 20 Aug 2018 05:42:00 -0000
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--- Comment #2 from bin cheng <amker at gcc dot gnu.org> ---
(In reply to Qirun Zhang from comment #0)
> It also affects gcc-8.1 at -O3. gcc-7.3 works fine.
>
> It appears that it starts at r253679.
>
>
> $ gcc-trunk -v
> Using built-in specs.
> COLLECT_GCC=gcc-trunk
> COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-
> linux-gnu/9.0.0/lto-wrapper
> Target: x86_64-pc-linux-gnu
> Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
> --enable-languages=c,c++ --disable-werror --enable-multilib
> Thread model: posix
> gcc version 9.0.0 20180819 (experimental) [trunk revision 263651] (GCC)
>
>
>
> $ gcc-trunk abc.c ; ./a.out > ref.txt
> $ gcc-trunk -O3 abc.c ; ./a.out > a.txt
> $ diff ref.txt a.txt
> 25,49c25,49
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> < 0
> ---
> > 1
> > 1
> > 1
> > 1
> > 0
> > 0
> > 1
> > 1
> > 1
> > 1
> > 1
> > 0
> > 0
> > 1
> > 1
> > 1
> > 1
> > 1
> > 0
> > 0
> > 1
> > 1
> > 1
> > 1
> > 1
> $ gcc-7.3 -O3 abc.c ; ./a.out > a.txt
> $ diff ref.txt a.txt
> $
>
>
> $ cat abc.c
> void printf();
> char a[7];
> char b[10][7];
> short c;
> int d, e, f, g;
> int main() {
> for (; d <= 4; d++) {
> e = 0;
> for (; e <= 6; e++) {
> if (a[c])
> b[e + 3][d + 2] = 1;
> a[0] = 5;
> b[e][d + 2] = 0;
> }
> }
> for (; f < 10; f++) {
> g = 0;
> for (; g < 7; g++)
> printf("%d\n", b[f][g]);
> }
> }
Sorry for the breakage, I will investigate it.
Thanks,
bin
>From gcc-bugs-return-613099-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 06:59:56 2018
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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/87024] New: ICE in fold_stmt_1
Date: Mon, 20 Aug 2018 06:59:00 -0000
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Bug ID: 87024
Summary: ICE in fold_stmt_1
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gcc-9.0.0-alpha20180819 snapshot (r263652), as well as gcc 8.2, 7.3, 6.3, 5.4,
4.9.4, 4.8.5 all ICE when compiling the following snippet w/ -O1 (-O2, -O3,
-Ofast, -Os) -fno-tree-dce:
void
mp (void)
{
(void) __builtin_va_arg_pack_len ();
}
void
ui (void)
{
mp ();
}
% gcc-9.0.0-alpha20180819 -O1 -fno-tree-dce -c zypn5ily.c
during IPA pass: inline
zypn5ily.c: In function 'ui':
zypn5ily.c:8:1: internal compiler error: Segmentation fault
8 | ui (void)
| ^~
0xcb39cf crash_signal
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/toplev.c:325
0xa2b33b fold_stmt_1
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/gimple-fold.c:4634
0xd2a293 fold_marked_statements
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/tree-inline.c:4949
0xd376f2 optimize_inline_calls(tree_node*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/tree-inline.c:5030
0x15029fc inline_transform(cgraph_node*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/ipa-inline-transform.c:682
0xbd726f execute_one_ipa_transform_pass
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/passes.c:2188
0xbd726f execute_all_ipa_transforms()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/passes.c:2230
0x8cacba cgraph_node::expand()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/cgraphunit.c:2109
0x8cbd22 expand_all_functions
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/cgraphunit.c:2254
0x8cbd22 symbol_table::compile()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/cgraphunit.c:2605
0x8ce189 symbol_table::compile()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/cgraphunit.c:2517
0x8ce189 symbol_table::finalize_compilation_unit()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/cgraphunit.c:2698
% gcc-9.0.0-alpha20180819 -O2 -fno-tree-dce -c zypn5ily.c
during GIMPLE pass: einline
zypn5ily.c: In function 'ui':
zypn5ily.c:11:1: internal compiler error: Segmentation fault
11 | }
| ^
0xcb39cf crash_signal
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/toplev.c:325
0xa2b33b fold_stmt_1
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/gimple-fold.c:4634
0xd2a293 fold_marked_statements
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/tree-inline.c:4949
0xd376f2 optimize_inline_calls(tree_node*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/tree-inline.c:5030
0x14f8579 early_inliner(function*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/ipa-inline.c:2796
>From gcc-bugs-return-613100-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 07:01:51 2018
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Subject: [Bug middle-end/86505] [6/7/8 Regression] __builtin_va_arg_pack_len() computes the number of arguments wrongly
Date: Mon, 20 Aug 2018 07:01:00 -0000
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--- Comment #7 from Arseny Solokha <asolokha at gmx dot com> ---
(In reply to Richard Biener from comment #6)
> I wonder if the auto-regression police can help here increasing coverage?
Here you are: PR87024.
>From gcc-bugs-return-613101-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 07:31:25 2018
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Subject: [Bug tree-optimization/87025] New: [9 Regression] ICE in add_record, at optinfo-emit-json.cc:175
Date: Mon, 20 Aug 2018 07:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87025
Bug ID: 87025
Summary: [9 Regression] ICE in add_record, at
optinfo-emit-json.cc:175
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-valid-code
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gcc-9.0.0-alpha20180819 snapshot (r263652) ICEs when compiling the following
snippet w/ -O1 -fsave-optimization-record -ftree-vectorize -fno-tree-scev-cprop
-fno-tree-sink:
void
fk (unsigned int sf)
{
for (;;)
{
if (sf != 0)
{
while (sf != 0)
++sf;
while (sf < 8)
++sf;
}
++sf;
}
}
% gcc-9.0.0-alpha20180819 -O1 -fsave-optimization-record -ftree-vectorize
-fno-tree-scev-cprop -fno-tree-sink -c hdtzb5rs.c
during GIMPLE pass: vect
hdtzb5rs.c: In function 'fk':
hdtzb5rs.c:2:1: internal compiler error: in add_record, at
optinfo-emit-json.cc:175
2 | fk (unsigned int sf)
| ^~
0x64094b optrecord_json_writer::add_record(json::object*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/optinfo-emit-json.cc:175
0xbc42e6 optrecord_json_writer::add_record(optinfo const*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/optinfo-emit-json.cc:156
0x90ba46 dump_context::end_any_optinfo()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/dumpfile.c:1120
0x90bae0 dump_context::begin_next_optinfo(dump_location_t const&)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/dumpfile.c:1107
0x90dd2e dump_context::begin_scope(char const*, dump_location_t const&)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/dumpfile.c:1070
0xf01591 auto_dump_scope::auto_dump_scope(char const*, dump_location_t)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/dumpfile.h:537
0xf01591 vect_analyze_loop(loop*, _loop_vec_info*, vec_info_shared*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/tree-vect-loop.c:2274
0xf1d763 try_vectorize_loop_1
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/tree-vectorizer.c:867
0xf1e591 vectorize_loops()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/tree-vectorizer.c:1075
>From gcc-bugs-return-613102-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 07:32:52 2018
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Subject: [Bug target/87014] [x32] __builtin_eh_return should use 64-bit mov to set return address
Date: Mon, 20 Aug 2018 07:32:00 -0000
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--- Comment #5 from camper <theonetruecamper at gmx dot de> ---
test case (-O0):
using ll = long long;
void fillstack() {
ll foo[] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
}
void f(ll=-1,ll=-1,ll=-1,ll=-1,ll=-1,ll=-1,ll arg7_on_stack=-1) {
throw 0;
}
void g() {
try {
f();
} catch(int) {
}
}
int main() {
fillstack();
g();
}
>From gcc-bugs-return-613103-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 07:46:20 2018
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Subject: [Bug sanitizer/78651] Incorrect exception handling when catch clause uses local class and PIC and sanitizer are active
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--- Comment #10 from chefmax at gcc dot gnu.org ---
Seems to be closed on GCC 8 and 7, OK to close?
>From gcc-bugs-return-613104-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 07:47:22 2018
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Subject: [Bug sanitizer/78651] Incorrect exception handling when catch clause uses local class and PIC and sanitizer are active
Date: Mon, 20 Aug 2018 07:47:00 -0000
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--- Comment #11 from chefmax at gcc dot gnu.org ---
(In reply to chefmax from comment #10)
> Seems to be closed on GCC 8 and 7, OK to close?
s/closed/fixed/
>From gcc-bugs-return-613105-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 07:53:34 2018
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Subject: [Bug target/87014] [x32] __builtin_eh_return should use 64-bit mov to set return address
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Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hjl.tools at gmail dot com
--- Comment #6 from Uroš Bizjak <ubizjak at gmail dot com> ---
Adding CC.
>From gcc-bugs-return-613106-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 07:56:25 2018
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Subject: [Bug rtl-optimization/86107] [9 Regression] ICE: in ix86_mitigate_rop, at config/i386/i386.c:42301 with -O -funroll-loops -mavx5124fmaps -mmitigate-rop --param=hot-bb-frequency-fraction=1
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Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> ---
-mmitigate-rop was deprecated in gcc-9.
>From gcc-bugs-return-613107-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 08:27:11 2018
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Subject: [Bug target/87026] New: [9 Regression] ICE in extract_constrain_insn_cached, at recog.c:2218
Date: Mon, 20 Aug 2018 08:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87026
Bug ID: 87026
Summary: [9 Regression] ICE in extract_constrain_insn_cached,
at recog.c:2218
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: powerpc-*-linux-gnu
gcc-9.0.0-alpha20180819 snapshot (r263652) ICEs when compiling the following
snippet w/ -O2 (-O3, -Ofast, -Os) -fno-if-conversion:
int jd;
int
uq (int u0)
{
goto al;
while (jd < 1)
{
jd = 0;
if (jd != 0)
{
al:
while (u0 != 0)
{
}
}
}
return 1 / u0;
}
% powerpc-e300c3-linux-gnu-gcc-9.0.0-alpha20180819 -O2 -fno-if-conversion -c
sakw6h4j.c
sakw6h4j.c: In function 'uq':
sakw6h4j.c:22:1: error: insn does not satisfy its constraints:
22 | }
| ^
(insn 56 0 0 (set (reg:SI 121)
(const_int 0 [0])) 502 {*movsi_internal1}
(nil))
during RTL pass: ce3
sakw6h4j.c:22:1: internal compiler error: in extract_constrain_insn_cached, at
recog.c:2218
0x61a5f9 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/rtl-error.c:108
0x61a623 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/rtl-error.c:118
0x618be5 extract_constrain_insn_cached(rtx_insn*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/recog.c:2218
0x1209abf insn_default_length(rtx_insn*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/config/rs6000/rs6000.md:7058
0xffe417 rs6000_insn_cost
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/config/rs6000/rs6000.c:34085
0x98a774 canonicalize_comparison(machine_mode, rtx_code*, rtx_def**)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/expmed.c:6249
0xbc36f1 prepare_cmp_insn
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/optabs.c:3816
0xbc402e gen_cond_trap(rtx_code, rtx_def*, rtx_def*, rtx_def*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/optabs.c:5288
0x13febff find_cond_trap
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/ifcvt.c:4657
0x13febff find_if_header
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/ifcvt.c:4282
0x13febff if_convert
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/ifcvt.c:5405
0x140015d execute
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/ifcvt.c:5553
>From gcc-bugs-return-613108-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 08:29:34 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/87013] Error: junk at end of line, first unrecognized character is `i'
Date: Mon, 20 Aug 2018 08:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87013
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |sparc-linux
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-08-20
Summary|xgcc: fatal error: no input |Error: junk at end of line,
|files |first unrecognized
| |character is `i'
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
> xgcc: error: unrecognized command line option '-qversion'; did you mean '--version'?
> xgcc: fatal error: no input files
That's not the problem, this error is supposed to happen, because your compiler
doesn't recognise the -qversion option.
> compilation terminated.
> configure:3458: $? = 1
> configure:3474: /media/gcc-8.2.0-compiled/./gcc/xgcc -B/media/gcc-8.2.0-compiled/./gcc/ -B/opt/gcc-8.2/sparc-linux/bin/ -B/opt/gcc-8.2/sparc-linux/lib/ -isystem /opt/gcc-8.2/sparc-linux/include -isystem /opt/gcc-8.2/sparc-linux/sys-include -o conftest -g -O2 conftest.c >&5
> /tmp/ccvuOEZf.s: Assembler messages:
> /tmp/ccvuOEZf.s:15: Error: junk at end of line, first unrecognized character is `i'
> configure:3477: $? = 1
> configure:3665: checking for suffix of object files
> configure:3687: /media/gcc-8.2.0-compiled/./gcc/xgcc -B/media/gcc-8.2.0-compiled/./gcc/ -B/opt/gcc-8.2/sparc-linux/bin/ -B/opt/gcc-8.2/sparc-linux/lib/ -isystem /opt/gcc-8.2/sparc-linux/include -isystem /opt/gcc-8.2/sparc-linux/sys-include -c -g -O2 conftest.c >&5
> /tmp/ccookNLX.s: Assembler messages:
> /tmp/ccookNLX.s:15: Error: junk at end of line, first unrecognized character is `i'
This is the problem.
Try compiling the source below using the command above, adding -save-temps, and
then look at the resulting .s file. See why your assembler can't process it (do
you even have an assembler for your target?)
> configure:3691: $? = 1
> configure: failed program was:
> | /* confdefs.h */
> | #define PACKAGE_NAME "GNU C Runtime Library"
> | #define PACKAGE_TARNAME "libgcc"
> | #define PACKAGE_VERSION "1.0"
> | #define PACKAGE_STRING "GNU C Runtime Library 1.0"
> | #define PACKAGE_BUGREPORT ""
> | #define PACKAGE_URL "http://www.gnu.org/software/libgcc/"
> | /* end confdefs.h. */
> |
> | int
> | main ()
> | {
> |
> | ;
> | return 0;
> | }
> configure:3705: error: in `/media/gcc-8.2.0-compiled/sparc-linux/libgcc':
> configure:3708: error: cannot compute suffix of object files: cannot compile
> See `config.log' for more details.
>From gcc-bugs-return-613109-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 08:31:06 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87015] [8 Regression] miscompilation of template heavy Boost Spirit code
Date: Mon, 20 Aug 2018 08:31:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Daniel Starke from comment #0)
> It is available here: https://sourceforge.net/projects/gcc-win64/files/8.2.0/
>
> Due to the nature of the bug I am unable to provide a reduced test case
> without an better idea of what the cause of the issue is. Compiling with -Og
> or -O1 instead of -O2 did not change the behavior.
As explained at https://gcc.gnu.org/bugs/ you still need to provide a
preprocessed testcase, not a URL. It doesn't have to be reduced.
>From gcc-bugs-return-613110-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 08:35:19 2018
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Subject: [Bug libstdc++/87027] New: lower_bound returns erroneous result, 32 bit
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Bug ID: 87027
Summary: lower_bound returns erroneous result, 32 bit
Product: gcc
Version: 6.3.0
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The program below outputs 2:
/usr/bin/g++ -m32 -std=c++14 ex.cpp && ./a.out
Vector maximal size: 4294967295 and actual size: 2415919104
Found value 2
It should output 3 or throw std::length_error.
See also
https://stackoverflow.com/questions/51907247/lower-bound-algorithm-stl-usage-preconditions/51910011#51910011
// compile with -m32 switch
#include<algorithm>
#include<iostream>
#include<stdexcept>
#include<vector>
using namespace std;
int main() {
try {
vector<uint8_t> v((1ULL << 28) * 9, 2); // 2.25 G entries
v.back() = 3; // the last of which is greater
cout<< "Vector maximal size: "<<v.max_size()<< " and actual size: " <<
v.size() <<endl;
uint8_t val=3;
auto x= lower_bound(v.begin(), v.end(), val );
if (x!=v.end() && !( val< *x ) ) {
cout << "Found value " << int(*x) << endl;
} else {
cout << "Not Found " << endl;
}
} catch (exception const & ex){
cerr<< ex.what()<<endl;
}
}
//----------
$ /usr/bin/g++ --version
g++ (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>From gcc-bugs-return-613111-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 08:36:33 2018
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Subject: [Bug libstdc++/31413] FAIL: 22_locale/time_get/get_date/wchar_t/4.cc execution test
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--- Comment #27 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #26)
> Paolo, do you remember if this testcase was specifically testing the zh_TW
> locale, or just sing that as an example of a locale using wide characters?
s/just sing/just using/
>From gcc-bugs-return-613112-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 08:44:31 2018
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Subject: [Bug ipa/87024] ICE in fold_stmt_1
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-20
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed. We end up with:
EMERGENCY DUMP:
ui ()
{
<bb 2> :
= 0;
return;
}
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Subject: [Bug c++/81830] missing Wunused-local-typedef on a typedef of an unnamed enum or struct
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
For unnamed class and enumeration types the typedef is the name of the type for
linkage purposes, so it can be used even if it's never referred to e.g.
template<typename T> void use(T) { }
void g (void)
{
typedef enum { e } F; // missing -Wunused-local-typedefs in C++
use(e);
}
The name 'F' is needed for the mangled name of use<F> even though it's not used
directly in the source. So that's probably why G++ treats the typedef names as
used. Maybe it could be made smarter, so that if no name is needed for linkage
purposes, then it still warns.
>From gcc-bugs-return-613114-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 08:54:22 2018
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Subject: [Bug c++/87017] vector must have the same value as its allocator
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----------------------------------------------------------------------------
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Peter VARGA from comment #0)
> using smatch = std::match_results<FaF::string::const_iterator,
> Allocator<FaF::string::const_iterator>>;
The value type of match_result<Iter> is sub_match<Iter>, so you need to use
Allocator<sub_match<Iter>> not Allocator<Iter>.
> Changing it to std::smatch then it compiles.
Because that uses the correct allocator type.
> Compiler options:
> -O3 -std=c++17 -Werror -Wextra -Wold-style-cast -Wall
If you use -std=gnu++17 then your code will be accepted, but is not portable
and is not valid C++.
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Subject: [Bug c++/87017] vector must have the same value as its allocator
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
N.B. it only works with clang and ICC because you're using them with an older
version of libstdc++, which didn't enforce this requirement. Saying "it
compiles with three compilers all using the same standard library" is only one
data point.
If you use clang's own libc++ you get a similar error:
In file included from /opt/wandbox/clang-head/include/c++/v1/regex:770:
/opt/wandbox/clang-head/include/c++/v1/vector:486:5: error: static_assert
failed due to requirement 'is_same<typename allocator_type::value_type,
value_type>::value' "Allocator::value_type must be same type as value_type"
static_assert((is_same<typename allocator_type::value_type,
value_type>::value),
^
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/opt/wandbox/clang-head/include/c++/v1/regex:5228:23: note: in instantiation of
template class
'std::__1::vector<std::__1::sub_match<std::__1::__wrap_iter<const char *> >,
FaF::Allocator<std::__1::__wrap_iter<const char *> > >' requested here
__container_type __matches_;
^
prog.cc:33:15: note: in instantiation of template class
'std::__1::match_results<std::__1::__wrap_iter<const char *>,
FaF::Allocator<std::__1::__wrap_iter<const char *> > >' requested here
FaF::smatch results {};
^
That's because the code is not valid according to the standard.
>From gcc-bugs-return-613116-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 09:01:40 2018
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Subject: [Bug libstdc++/87020] comparison operator isn't called for stateless allocator without is_always_equal for C++11/14
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The is_always_equal trait was invented in libstdc++ before it got into the
standard, and if we didn't give the same behaviour for C++11 and C++14 there
would be ODR violations. So this is not going to change.
The trait was added to resolve a defect report about missing 'noexcept' on
container member functions, so arguably it's needed to fix defects in C++11 and
C++14 anyway.
>From gcc-bugs-return-613117-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 09:08:05 2018
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Subject: [Bug libstdc++/87020] comparison operator isn't called for stateless allocator without is_always_equal for C++11/14
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This property of the library is documented:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/bugs.html#manual.bugs.dr2108
>From gcc-bugs-return-613118-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 09:28:22 2018
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Subject: [Bug c/87028] New: false positive -Wstringop-truncation strncpy with global variable source string
Date: Mon, 20 Aug 2018 09:28:00 -0000
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Bug ID: 87028
Summary: false positive -Wstringop-truncation strncpy with
global variable source string
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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Hi,
Just builded latest gcc (GCC) 9.0.0 20180820 (experimental) commit 316828699
on Debian Linux 4.17.0-1-amd64 with gcc (Debian 8.2.0-3) 8.2.0 and ldd (Debian
GLIBC 2.27-5) 2.27
I know there are already several -Wstringop-truncation false positive related
threads but I'm not sure if this particular behaviour : emit warning when
source string is global variable and does not emit warning when source string
is local variable, has already been addressed.
////////////////////////////////////////////////////////
////////////////////////////////////////////////////////
GLOBAL VARIABLE SOURCE STRING => WARNING
$ cat a.c && gcc -O2 -Wall -Wextra -S a.c
char *strncpy (char *, const char *, __SIZE_TYPE__);
struct S {
char dest[5];
};
const char src[] = "1234567890";
void function(struct S *s)
{
strncpy(s->dest,src,sizeof(s->dest)-1);
s->dest[sizeof(s->dest)-1]='\0';
}
////////////////////////////////////////////////////////
a.c: In function ‘function’:
a.c:12:5: warning: ‘strncpy’ output truncated copying 4 bytes from a string of
length 10 [-Wstringop-truncation]
strncpy(s->dest,src,sizeof(s->dest)-1);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
////////////////////////////////////////////////////////
////////////////////////////////////////////////////////
LOCAL VARIABLE SOURCE STRING => NO WARNING
$ cat a.c && gcc -O2 -Wall -Wextra -S a.c
char *strncpy (char *, const char *, __SIZE_TYPE__);
struct S {
char dest[5];
};
void function(struct S *s)
{
const char src[] = "1234567890";
strncpy(s->dest,src,sizeof(s->dest)-1);
s->dest[sizeof(s->dest)-1]='\0';
}
////////////////////////////////////////////////////////
////////////////////////////////////////////////////////
CONSTANT SOURCE STRING => WARNING
$ cat a.c && gcc -O2 -Wall -Wextra -S a.c
////////////////////////////////////////////////////////
char *strncpy (char *, const char *, __SIZE_TYPE__);
struct S {
char dest[5];
};
void function(struct S *s)
{
strncpy(s->dest,"1234567890",sizeof(s->dest)-1);
s->dest[sizeof(s->dest)-1]='\0';
}
////////////////////////////////////////////////////////
a.c: In function ‘function’:
a.c:11:5: warning: ‘strncpy’ output truncated copying 4 bytes from a string of
length 10 [-Wstringop-truncation]
11 | strncpy(s->dest,"1234567890",sizeof(s->dest)-1);
////////////////////////////////////////////////////////
////////////////////////////////////////////////////////
This last case, constant source string, seems to be duplicate
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84474 but I would like to know if
there are any news/recommendations about this problem.
Lots of codebases can't be compiled with -Werror flag now.
I see lots of people, mechanically changing strncpy for memcpy. Other people do
the transformation strncpy of size n => strncpy of size n-1 + '\0' at index
n-1. Without success for me in the "global variable" case.
What would be the recommended way with the examples above ?
Cheers,
A.
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Subject: [Bug c++/52801] improve selective typedef unwrapping
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The only real difference between Clang and G++ here is that Clang preserves the
vector<Real> type in the output, but G++ shows vector<double>.
GCC's first line shows the
52801.cc:9:8: error: no match for ‘operator=’ (operand types are
‘std::__cxx11::string {aka std::__cxx11::basic_string<char>}’ and
‘std::vector<double>’)
This uses "aka" to relate the type shown in the source (which might be a
typedef) with the canonical types shown in the later errors. If that first line
said "'vector<Real>' {aka 'std::vector<double>'}" I think it would be fine.
The fact the typedef is preserved for the string but not the vector may be
because the string is declared using a typedef ("string") but the vector is not
("Real" is a typedef, but "vector<Real>" is not).
Some of the other differences are due to comparing apples with oranges:
- Several more lines in GCC output, because the clang test was done with
-std=gnu++98 and the GCC one with -std=gnu++14, so there are extra overloads in
the GCC version. Clang also prints more lines for recent standards.
- Clang shows std::basic_string<char> and gcc shows
std::__cxx11::basic_string<char>, but only because the clang test was using GCC
4.3 headers. Using libc++ headers shows std::__1::basic_string<char> which is
no better. N.B. GCC would be improved by PR 81239, so that the first line would
show "std::string {aka 'std::__cxx11::basic_string'}". I might even be able to
make that happen with a libstdc++ change.
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Subject: [Bug libstdc++/87027] lower_bound returns erroneous result, 32 bit
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is the problem I reported as PR 78448
*** This bug has been marked as a duplicate of bug 78448 ***
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Subject: [Bug libstdc++/78448] Container max_size() functions don't consider the range of their difference_type
Date: Mon, 20 Aug 2018 09:59:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |lists at sagnix dot eu
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 87027 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-613122-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 10:01:09 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/78448] Container max_size() functions don't consider the range of their difference_type
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-20
Ever confirmed|0 |1
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Testcase from PR 87027:
The program below outputs 2:
/usr/bin/g++ -m32 -std=c++14 ex.cpp && ./a.out
Vector maximal size: 4294967295 and actual size: 2415919104
Found value 2
It should output 3 or throw std::length_error.
See also
https://stackoverflow.com/questions/51907247/lower-bound-algorithm-stl-usage-preconditions/51910011#51910011
// compile with -m32 switch
#include<algorithm>
#include<iostream>
#include<stdexcept>
#include<vector>
using namespace std;
int main() {
try {
vector<uint8_t> v((1ULL << 28) * 9, 2); // 2.25 G entries
v.back() = 3; // the last of which is greater
cout<< "Vector maximal size: "<<v.max_size()<< " and actual size: " <<
v.size() <<endl;
uint8_t val=3;
auto x= lower_bound(v.begin(), v.end(), val );
if (x!=v.end() && !( val< *x ) ) {
cout << "Found value " << int(*x) << endl;
} else {
cout << "Not Found " << endl;
}
} catch (exception const & ex){
cerr<< ex.what()<<endl;
}
}
//----------
$ /usr/bin/g++ --version
g++ (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>From gcc-bugs-return-613123-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 10:02:43 2018
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Subject: [Bug libstdc++/78448] Container max_size() functions don't consider the range of their difference_type
Date: Mon, 20 Aug 2018 10:02:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
UBsan shows where the overflows happen:
/home/jwakely/gcc/9/include/c++/9.0.0/bits/stl_vector.h:359:59: runtime error:
pointer index expression with base 0x6760f010 overflowed to 0xf760f010
/home/jwakely/gcc/9/include/c++/9.0.0/bits/stl_algobase.h:777:20: runtime
error: pointer index expression with base 0x6760f010 overflowed to 0xf760f010
/home/jwakely/gcc/9/include/c++/9.0.0/bits/stl_algobase.h:778:24: runtime
error: pointer index expression with base 0x6760f010 overflowed to 0xf760f010
Vector maximal size: 4294967295 and actual size: 2415919104
Found value 2
We just need to fix our max_size() as per comment 0.
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Subject: [Bug c++/87017] vector must have the same value as its allocator
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Peter VARGA <development@faf-ltd.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|INVALID |FIXED
--- Comment #3 from Peter VARGA <development@faf-ltd.com> ---
Jonathan, I thank you very much for your clear and simple explanation.
I have fixed it now as you suggested according to the standard!
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Subject: [Bug c++/87016] std::optional::operator= in constexpr context
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The code is valid. The optional<T>::operator=(U&&) assignment operator is not
used when is_scalar<T> and is_same<T, decay_T<U>> (which is true here, where
T=int and U=int).
That means the assignment creates a temporary optional<int> using the constexpr
constructor, i.e.
bar = std::optional<int>(10);
This is valid in a constexpr function.
>From gcc-bugs-return-613126-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 10:41:37 2018
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Subject: [Bug c++/87017] vector must have the same value as its allocator
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Resolution|FIXED |INVALID
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Changing status back. FIXED means GCC was fixed, but GCC doesn't need fixing.
https://gcc.gnu.org/bugzilla/page.cgi?id=fields.html#bug_status
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Subject: [Bug target/87026] [9 Regression] ICE in extract_constrain_insn_cached, at recog.c:2218
Date: Mon, 20 Aug 2018 12:08:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
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--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Confirmed (also on 64-bit, etc.)
>From gcc-bugs-return-613128-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 12:16:15 2018
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Subject: [Bug fortran/87019] ICE: Static member of derived type, organized in coarray accessed
Date: Mon, 20 Aug 2018 12:16:00 -0000
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--- Comment #1 from Alexander Lehmann <welttensor at web dot de> ---
I found out that this bug was encounter in the following forum as well:
https://github.com/szaghi/HASTY/issues/6
and then opened in this case:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78682
But unfortunately the ICE still persists in the current version of gfortran.
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From: "bobogu at atlas dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87016] std::optional::operator= in constexpr context
Date: Mon, 20 Aug 2018 12:38:00 -0000
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--- Comment #2 from bobogu at atlas dot cz ---
Do I understand it correctly that this will get optimized into one statement
saying
bar = std::optional<int>(10);
If so, is there something that could prevent such optimizations in order to
check if the code is portable?
Also, just to clarify, this has nothing to do with this proposal
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0602r3.html to which
someone has pointed me to?
>From gcc-bugs-return-613130-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 12:52:27 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87016] std::optional::operator= in constexpr context
Date: Mon, 20 Aug 2018 12:52:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to bobogu from comment #2)
> Do I understand it correctly that this will get optimized into one statement
> saying
>
> bar = std::optional<int>(10);
No, it's not an optimization.
When you assign an int to optional<int> it is equivalent to constructing a
temporary optional<int> and then assigning that to the left-hand operand.
> If so, is there something that could prevent such optimizations in order to
> check if the code is portable?
It's not an optimization, it's the required behaviour according the the
specification of std::optional in the standard.
> Also, just to clarify, this has nothing to do with this proposal
> http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0602r3.html to
> which someone has pointed me to?
It's nothing to do with that.
>From gcc-bugs-return-613131-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 13:14:30 2018
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From: "bobogu at atlas dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87016] std::optional::operator= in constexpr context
Date: Mon, 20 Aug 2018 13:14:00 -0000
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--- Comment #4 from bobogu at atlas dot cz ---
(In reply to Jonathan Wakely from comment #3)
> (In reply to bobogu from comment #2)
> When you assign an int to optional<int> it is equivalent to constructing a
> temporary optional<int> and then assigning that to the left-hand operand.
I feel stupid, but I still don't understand how that can work in a constexpr
context when the current c++17 standard doesn't specify any constexpr
assignment operator.
The second line of this snippet
std::optional<int> bar = 3;
bar = std::optional<int>(10);
would call the 3rd assignment operator
(https://en.cppreference.com/w/cpp/utility/optional/operator%3D), right? And
the operator isn't constexpr, but works in a constexpr function.
>From gcc-bugs-return-613132-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 13:16:35 2018
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Subject: [Bug bootstrap/87018] [9 Regression] Boostrap failure on AIX
Date: Mon, 20 Aug 2018 13:16:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |segher at gcc dot gnu.org
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
I always use --disable-nls on AIX (and on other systems where NLS causes
problems). I don't know if there is a bug here (and where), or if this
is user error; but that will avoid all such problems.
>From gcc-bugs-return-613133-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 13:29:31 2018
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Subject: [Bug fortran/80931] ICE on move_alloc in gimplify_expr, at gimplify.c:11335
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--- Comment #8 from Arjen Markus <arjen.markus895 at gmail dot com> ---
Thank you! I do appreciate such comments - apart from the fun it was
to write the book and experiment with all the features of Fortran, it
is great to hear that other people enjoy it too.
Regards,
Arjen
2018-08-17 23:06 GMT+02:00 snowfed at mail dot ru <gcc-bugzilla@gcc.gnu.org>:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80931
>
> --- Comment #7 from snowfed <snowfed at mail dot ru> ---
> Wow! Read your book with great pleasure! (the Russian translation of it)
>
> (In reply to Arjen Markus from comment #6)
>> Yes, I am :).
>>
>> Regards,
>>
>> Arjen
>>
>
> --
> You are receiving this mail because:
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>From gcc-bugs-return-613134-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 13:34:37 2018
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Subject: [Bug c++/87016] std::optional::operator= in constexpr context
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to bobogu from comment #4)
> I feel stupid, but I still don't understand how that can work in a constexpr
> context when the current c++17 standard doesn't specify any constexpr
> assignment operator.
That's true, but the standard is broken.
All implementations define the assignment operator as defaulted, and so the
compiler makes it constexpr.
In fact the p0602R3 proposal you linked to is relevant, because it would
*require* implementations to define the operator as defaulted (in order to be
trivial) and so the compiler is always going to make it constexpr for
std::optional<int>.
Anyway, I don't consider "I can use more things in constant expressions than
the standard says" to be a bug.
>From gcc-bugs-return-613135-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 13:54:33 2018
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Subject: [Bug libstdc++/86963] std::tuple incorrectly assigned
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Mon Aug 20 13:53:56 2018
New Revision: 263661
URL: https://gcc.gnu.org/viewcvs?rev=263661&root=gcc&view=rev
Log:
PR libstdc++/86963 Remove use of __tuple_base in std::tuple
The _Tuple_impl base class can be used to disable copy/move assignment,
without requiring an extra base class.
Exception specifications on std::tuple assignment and swap functions can
be defined directly using is_nothrow_swappable, instead of querying the
base classes.
PR libstdc++/86963
* include/std/tuple (_Tuple_impl::operator=): Define as deleted.
(_Tuple_impl::_M_assign): New functions to perform assignment instead
of assignment operators.
(_Tuple_impl::_M_swap): Remove exception specification.
(_Tuple_impl<_Idx, _Head>): Likewise.
(_TC::_NonNestedTuple, _TC::_NotSameTuple): Use __remove_cvref_t.
(__tuple_base): Remove.
(tuple, tuple<_T1, _T2>): Remove inheritance from __tuple_base.
(tuple::operator=, tuple<_T1, _T2>::operator=): Call _M_assign.
(tuple::swap, tuple<_T1, _T2>::swap): Define exception specification
using __is_nothrow_swappable.
(tuple<_T1, _T2>::tuple(_U1&&, _U2&&)): Use __remove_cvref_t.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/std/tuple
>From gcc-bugs-return-613136-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 13:56:44 2018
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Subject: [Bug fortran/87019] ICE: Static member of derived type, organized in coarray accessed
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-20
Ever confirmed|0 |1
--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Duplicate of pr77871?
>From gcc-bugs-return-613137-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 14:00:55 2018
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
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nsz at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
CC| |nsz at gcc dot gnu.org
--- Comment #10 from nsz at gcc dot gnu.org ---
Created attachment 44561
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44561&action=edit
good rtl dump of combine pass
>From gcc-bugs-return-613138-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 14:01:57 2018
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Subject: [Bug c++/78655] gcc doesn't exploit the fact that the result of pointer addition can not be nullptr
Date: Mon, 20 Aug 2018 14:01:00 -0000
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Aug 20 14:01:05 2018
New Revision: 263662
URL: https://gcc.gnu.org/viewcvs?rev=263662&root=gcc&view=rev
Log:
2018-08-20 Richard Biener <rguenther@suse.de>
PR tree-optimization/78655
* tree-vrp.c (extract_range_from_binary_expr_1): Make
pointer + offset nonnull if either operand is nonnull work.
* gcc.dg/tree-ssa/evrp11.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/evrp11.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vrp.c
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Subject: [Bug c++/87016] std::optional::operator= in constexpr context
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #5)
> In fact the p0602R3 proposal you linked to is relevant, because it would
> *require* implementations to define the operator as defaulted (in order to
> be trivial) and so the compiler is always going to make it constexpr for
> std::optional<int>.
I've raised this with the standards committee.
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Subject: [Bug c++/78655] gcc doesn't exploit the fact that the result of pointer addition can not be nullptr
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--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note the original testcase is already optimized with GCC 8 due to the fix for
PR35878 and enabling it for all standard modes.
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From: "nsz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
Date: Mon, 20 Aug 2018 14:04:00 -0000
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--- Comment #11 from nsz at gcc dot gnu.org ---
Created attachment 44562
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44562&action=edit
bad rtl dump of combine pass
attached good and bad dump of combine, i also tried to look at the array
contents, it seems to go from (good):
hello hola! goddag
to (bad):
goddo hola! goddag
in the last option_stopwatch_a call in main (even though the array 'a' seems to
be 'hello' before the call).
>From gcc-bugs-return-613142-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 14:14:10 2018
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87029] New: Add -Wredundant-move
Date: Mon, 20 Aug 2018 14:14:00 -0000
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Bug ID: 87029
Summary: Add -Wredundant-move
Product: gcc
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Similarly to 86981, we could also warn here about the redundant (but not
pessimizing) move here:
#include <utility>
struct S { };
S
foo (S s)
{
return std::move (s);
}
the compiler will try a move operation regardless the std::move (if the move
ctor is present and accessible).
Unless the parameter is const, of course.
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Subject: [Bug c++/87029] Add -Wredundant-move warning
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-20
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
Summary|Add -Wredundant-move |Add -Wredundant-move
| |warning
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This should be a fairly easy extension of -Wpessimizing-move.
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Subject: [Bug target/86984] invalid relocation accessing a const char arrray
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--- Comment #3 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Mon Aug 20 14:20:59 2018
New Revision: 263664
URL: https://gcc.gnu.org/viewcvs?rev=263664&root=gcc&view=rev
Log:
PR target/86984
* expr.c (expand_assignment): Assert that bitpos is positive.
(store_field): Likewise
(expand_expr_real_1): Make sure that bitpos is positive.
* config/alpha/alpha.h (CONSTANT_ADDRESS_P): Avoid signed
integer overflow.
PR target/86984
* gcc.target/alpha/pr86984.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/alpha/pr86984.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/alpha/alpha.h
trunk/gcc/expr.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/87026] [9 Regression] ICE in extract_constrain_insn_cached, at recog.c:2218
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |law at gcc dot gnu.org
--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This is caused by r263591 (of a few days ago).
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Subject: [Bug bootstrap/87030] New: GCC fails to build with Xcode 10, attempting an impossible multilib build
Date: Mon, 20 Aug 2018 14:24:00 -0000
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Bug ID: 87030
Summary: GCC fails to build with Xcode 10, attempting an
impossible multilib build
Product: gcc
Version: 8.2.0
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Building with Xcode 10 (beta) on macOS 10.13 or 10.14 (beta), leads to a build
failure because by default, configure sets GCC up for a multilib build.
However, starting with Xcode 10, Apple has removed support for 32-bit: thus,
the builds fails when trying to link libgcc, because it does not find the
32-bit system libc.
Passing --disable-multilib fixes bootstrap. However, the default configure
should detect that 32-bit is not supported and automatically build without
32-bit multilib.
>From gcc-bugs-return-613147-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 14:31:08 2018
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From: "bobogu at atlas dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87016] std::optional::operator= in constexpr context
Date: Mon, 20 Aug 2018 14:30:00 -0000
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--- Comment #7 from bobogu at atlas dot cz ---
(In reply to Jonathan Wakely from comment #5)
> (In reply to bobogu from comment #4)
> All implementations define the assignment operator as defaulted, and so the
> compiler makes it constexpr.
>
> In fact the p0602R3 proposal you linked to is relevant, because it would
> *require* implementations to define the operator as defaulted (in order to
> be trivial) and so the compiler is always going to make it constexpr for
> std::optional<int>.
Ah, finally it makes sense to me!
> Anyway, I don't consider "I can use more things in constant expressions than
> the standard says" to be a bug.
All right, I'm sorry then... I just thought that as this is undocumented, it
could lead to producing an unportable code.
Anyway, thank you for clearing it out.
> I've raised this with the standards committee.
Thanks!
>From gcc-bugs-return-613148-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 14:37:52 2018
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Subject: [Bug target/87026] [9 Regression] ICE in extract_constrain_insn_cached, at recog.c:2218
Date: Mon, 20 Aug 2018 14:37:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
I have a patch.
>From gcc-bugs-return-613149-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 14:57:01 2018
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Subject: [Bug c++/87015] [8 Regression] miscompilation of template heavy Boost Spirit code
Date: Mon, 20 Aug 2018 14:57:00 -0000
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--- Comment #2 from Daniel Starke <daniel.f.starke at freenet dot de> ---
I am not quite sure how to do this in this case. GCC terminates without an
error but the resulting application misbehaves since GCC 8.1.0. That means the
assembly output is wrong. Any idea on how to make a reproducable test case that
matches the bug reporting guidelines and works for my issue is welcome.
>From gcc-bugs-return-613151-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 15:05:20 2018
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Subject: [Bug middle-end/84184] gcc generates wrong relocations with negative offsets in struct arrays
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
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--- Comment #13 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
.
*** This bug has been marked as a duplicate of bug 86984 ***
>From gcc-bugs-return-613150-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 15:05:17 2018
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Subject: [Bug target/86984] invalid relocation accessing a const char arrray
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
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--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
*** Bug 84184 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-613152-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 15:11:08 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87016] std::optional::operator= in constexpr context
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--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to bobogu from comment #7)
> All right, I'm sorry then... I just thought that as this is undocumented, it
> could lead to producing an unportable code.
It could, except that you should get the same behaviour for every correct
implementation. Your example doesn't compile with libc++, but that's a bug:
https://bugs.llvm.org/show_bug.cgi?id=38638
>From gcc-bugs-return-613154-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 15:18:24 2018
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From: "welttensor at web dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/77871] [6/7/8/9 Regression] [Coarray] [OOP] ICE in gfc_get_caf_token_offset, at fortran/trans-expr.c:1981
Date: Mon, 20 Aug 2018 15:18:00 -0000
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Alexander Lehmann <welttensor at web dot de> changed:
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--- Comment #4 from Alexander Lehmann <welttensor at web dot de> ---
*** Bug 87019 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-613153-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 15:18:23 2018
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Subject: [Bug fortran/87019] ICE: Static member of derived type, organized in coarray accessed
Date: Mon, 20 Aug 2018 15:18:00 -0000
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Alexander Lehmann <welttensor at web dot de> changed:
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--- Comment #3 from Alexander Lehmann <welttensor at web dot de> ---
True, that looks very similar though it is already two years old an still
marked as "NEW".
I marked mine as duplicate, now, but hope that this issue will be resolved in
near future. Unfortunately, this issue hinders the use of the combination of
derived types and co-arrays which would help making code look clean.
*** This bug has been marked as a duplicate of bug 77871 ***
>From gcc-bugs-return-613155-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 15:35:44 2018
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From: "bobogu at atlas dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87016] std::optional::operator= in constexpr context
Date: Mon, 20 Aug 2018 15:35:00 -0000
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--- Comment #9 from bobogu at atlas dot cz ---
(In reply to Jonathan Wakely from comment #8)
> (In reply to bobogu from comment #7)
> > All right, I'm sorry then... I just thought that as this is undocumented, it
> > could lead to producing an unportable code.
>
> It could, except that you should get the same behaviour for every correct
> implementation. Your example doesn't compile with libc++, but that's a bug:
> https://bugs.llvm.org/show_bug.cgi?id=38638
Yes, that was just my misconception before you got me on the right track - I
thought clang's behaviour was correct because of what I saw in the standard :-)
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug jit/87003] use nonnull attribute in libgccjit.h
Date: Mon, 20 Aug 2018 15:36:00 -0000
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--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
It would be good to make the header file be more self-documenting.
In general, every pointer argument ought to be non-NULL, but a NULL will be
checked for and gracefully rejected.
The exception is gcc_jit_location *, which can always be NULL.
libgccjit performs error-checking at the API boundary: there are many places
where a NULL pointer argument will lead to a failure that puts the context into
an "invalid" state, but such a failure will be handled gracefully without
segfaulting:
https://gcc.gnu.org/onlinedocs/jit/topics/contexts.html#error-handling
This means that e.g. C code calling into the API doesn't need to check
everywhere for NULL results before passing them back in as arguments to
followup calls; it can just check once at the end of populating a context.
(FWIW, I notice that the Rust bindings don't do error-handling yet:
https://github.com/swgillespie/gccjit.rs#error-handling )
The docs for attribute "nonnull":
https://gcc.gnu.org/onlinedocs/gcc-8.2.0/gcc/Common-Function-Attributes.html#Common-Function-Attributes
say it:
> "...causes the compiler to check that [...] arguments [...] are
> non-null. If the compiler determines that a null pointer is passed
> in an argument slot marked as non-null, and the -Wnonnull option is
> enabled, a warning is issued. The compiler may also choose to make
> optimizations based on the knowledge that certain function arguments
> will never be null"
That last sentence about optimizations makes me a little wary: it *is* possible
for such arguments to be NULL (and my test cases make use of this to verify
that the API does indeed gracefully handle these errors).
But it does seem useful to mark all those arguments, and potentially warn for
obvious "NULL in the wrong places" typos.
Thoughts?
>From gcc-bugs-return-613157-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 15:49:58 2018
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Subject: [Bug target/87031] New: nios2 optimization for size - two cases of regression relatively to 5.3.0
Date: Mon, 20 Aug 2018 15:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87031
Bug ID: 87031
Summary: nios2 optimization for size - two cases of regression
relatively to 5.3.0
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
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Created attachment 44563
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44563&action=edit
first case - shifts instead of mulx
Here are two cases of significant regression in optimization for size between
5.3.0 (a version supplied in Altera Nios2 SDK) and 8.2.0.
Both cases compiled with -Wall -Os -ffreestanding -fbuiltin -mhw-div -mhw-mul
-mhw-mulx
It looks like in the first case -Os flag caused to compiler to forget that
hw-mulx is present.
The the second case, in addition to the same problem as in the first case,
compiler decided to unroll the loop. An exact opposite of what one expects from
'-s'.
I checked if the problems appear with similar back ends ('riscv -mabi=ilp32
-march=rv32im' and 'mips -mabi=32 -mips32r6 -mcompact-branches=always').
The first problem (shifts instead of mulx) appear unique to nios2. The second
problem (unrolling) shows up on all three architectures.
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Subject: [Bug target/87031] nios2 optimization for size - two cases of regression relatively to 5.3.0
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--- Comment #1 from Michael_S <already5chosen at yahoo dot com> ---
Created attachment 44564
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44564&action=edit
second case - loop unrolled
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Subject: [Bug c/87028] false positive -Wstringop-truncation strncpy with global variable source string
Date: Mon, 20 Aug 2018 16:33:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
CC| |msebor at gcc dot gnu.org
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
This is the same issue as pr84474.
The warning in all these cases is by design. There is an (undocumented)
suppression mechanism in GCC to avoid warning for instances of calls that are
followed by the nul assignment. The suppression works in the second example
when GCC sees the nul assignment but not in the first or last one where the
warning triggers before access to the subsequent statement is available. In
both of these, the strncpy call is transformed early on to memcpy (the warning
is issued just before this transformation) so avoiding the diagnostic in these
cases would prevent diagnosing instances where the nul isn't stored next. In
effect, it's a tradeoff between false positives and false negatives, forced by
the early transformation. IMO, the early folding of strncpy to memcpy is
unhelpful (it causes false negatives in buffer overflow detection) and should
be done later, but so far I haven't been successful at convincing others to
defer it.
>From gcc-bugs-return-613160-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 16:38:03 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87028] false positive -Wstringop-truncation strncpy with global variable source string
Date: Mon, 20 Aug 2018 16:38:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-20
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=84474
Ever confirmed|0 |1
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
The test case here is more compelling than the one in bug 84474 and I agree
that it would be helpful to avoid the warning, although not at the expense of
true positives. Short of deferring the strncpy -> memcpy folding I don't see a
way to do it. Let me confirm this report with the hope that GCC can change to
do the folding later.
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
Date: Mon, 20 Aug 2018 16:49:00 -0000
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--- Comment #12 from nsz at gcc dot gnu.org ---
the wrong string seems to be caused by a missing ldm
good main:
...
mov r4, #0
str r4, [sp, #32]
mov r2, #2
str r2, [sp, #36]
add r2, sp, #40
str r2, [sp, #4]
str r4, [sp, #8]
ldm ip, {r0, r1} /// load r0 (content is 'hell')
str r0, [sp, #40] /// store the right r0
strh r1, [sp, #44] @ movhi
ldr r2, [sp, #66] @ unaligned
str r2, [sp, #46] @ unaligned
ldrh r2, [sp, #70] @ unaligned
strh r2, [sp, #50] @ unaligned
add r2, sp, #72
ldm r2, {r0, r1}
str r0, [sp, #52]
strh r1, [sp, #56] @ movhi
mov r1, r3
add r0, sp, #4
bl option_stopwatch_a.5061
bad main:
...
mov r4, #0
str r4, [sp, #32]
mov r2, #2
str r2, [sp, #36]
add r2, sp, #40
str r2, [sp, #4]
str r4, [sp, #8]
ldr r1, [sp, #64]
str r0, [sp, #40] /// store a bad r0 (content is 'godd')
strh r1, [sp, #44] @ movhi
ldr r2, [sp, #66] @ unaligned
str r2, [sp, #46] @ unaligned
ldrh r2, [sp, #70] @ unaligned
strh r2, [sp, #50] @ unaligned
ldr r1, [sp, #76]
str r0, [sp, #52]
strh r1, [sp, #56] @ movhi
mov r1, r3
add r0, sp, #4
bl option_stopwatch_a.5061
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Subject: [Bug c++/87032] New: incorrect nested structure with union initialization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87032
Bug ID: 87032
Summary: incorrect nested structure with union initialization
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vadim at sukhomlinov dot co
Target Milestone: ---
For the code:
/**************/
struct f1 {int x,y;};
struct f2 {int x,y,z,t;};
struct T {
const char * name;
union {
struct f1 fn1;
struct f2 fn2;
} d;
};
extern "C" void p(struct T);
int main(){
p({"%x",{.fn2={1,2,3,4}}});
}
/******************/
gcc 7.3 generates:
<source>: In function 'int main()':
<source>:15:26: internal compiler error: in reshape_init_class, at
cp/decl.c:5802
p({"%x",{.fn2={1,2,3,4}}});
^
mmap: Invalid argument
gcc 8.1/8.2:
<source>: In function 'int main()':
<source>:15:26: error: could not convert '{"%x", {{1, 2, 3, 4}}}' from
'<brace-enclosed initializer list>' to 'T'
p({"%x",{.fn2={1,2,3,4}}});
^
Compiler returned: 1
At the same time Clang starting 3.1 and higher generates valid code.
Testing done using https://godbolt.org/
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Subject: [Bug c++/78655] gcc doesn't exploit the fact that the result of pointer addition can not be nullptr
Date: Mon, 20 Aug 2018 17:12:00 -0000
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--- Comment #8 from Marc Glisse <glisse at gcc dot gnu.org> ---
(just to put this somewhere)
We have multiple ways of doing pointer arithmetic in gcc. After the recent
patch, we know that g returns nonnull, but we don't know it for f.
struct A{int a,b;};
int*f(A*p){return&p->b;}
int*g(A*p){return(int*)p+1;}
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From: "wilco at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
Date: Mon, 20 Aug 2018 17:21:00 -0000
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Wilco <wilco at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #13 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to nsz from comment #12)
> the wrong string seems to be caused by a missing ldm
Yes what happens is that it decides to combine instruction 150 and 190 and
split an ldm2:
insn_cost 4 for 150: r197:SI=sfp:SI-0x24
...
insn_cost 0 for 190: {r0:SI=[r197:SI];r1:SI=[r197:SI+0x4];}
allowing combination of insns 150 and 190
original costs 4 + 0 = 0
replacement costs 8 + 8 = 16
modifying insn i2 150: r0:SI=[sfp:SI-0x24]
deferring rescan insn with uid = 150.
modifying insn i3 190: r1:SI=[sfp:SI-0x20]
deferring rescan insn with uid = 190.
There are lots of instructions between 150 and 190, including another ldm2
which writes r0:
150: r0:SI=[sfp:SI-0x24]
...
163: {r0:SI=[r206:SI];r1:SI=[r206:SI+0x4];}
...
190: r1:SI=[sfp:SI-0x20]
The combination ends up corrupting r0 because one of the loads is lifted across
many instructions without checking liveness. It seems the safest way to split
an instruction is to place the new instructions next to each other.
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
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--- Comment #14 from Wilco <wilco at gcc dot gnu.org> ---
Note there is also an issue with costs, if the cost is zero then it seems to
behave like infinite cost. It would be better to properly cost an instruction
sequence given there is a new interface for this now. If the cost is still
zero, it could get the default cost rather than being treated like infinite
cost, resulting in non-optimal replacements.
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Subject: [Bug bootstrap/87013] Error: junk at end of line, first unrecognized character is `i'
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--- Comment #2 from martin <mfe at live dot de> ---
Created attachment 44565
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44565&action=edit
conftest.s
Attached is the generated conftest.s file of the command
> /media/gcc-8.2.0-compiled/./gcc/xgcc -B/media/gcc-8.2.0-compiled/./gcc/ -B/opt/gcc-8.2/sparc-linux/bin/ -B/opt/gcc-8.2/sparc-linux/lib/ -isystem /opt/gcc-8.2/sparc-linux/include -isystem /opt/gcc-8.2/sparc-linux/sys-include -c -g -O2 -save-temps conftest.c
I'm afraid I don't have any assembler tools installed (Only the gcc 7.2
enviroment for C and C++)
Let me know, if you need more information.
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Subject: [Bug target/87014] [x32] __builtin_eh_return should use 64-bit mov to set return address
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--- Comment #7 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Mon Aug 20 19:14:04 2018
New Revision: 263672
URL: https://gcc.gnu.org/viewcvs?rev=263672&root=gcc&view=rev
Log:
x86: Always update EH return address in word_mode
On x86, return address is always popped in word_mode. eh_return needs
to put EH return address in word_mode on stack.
gcc/
PR target/87014
* config/i386/i386.md (eh_return): Always update EH return
address in word_mode.
gcc/testsuite/
PR target/87014
* g++.dg/torture/pr87014.C: New file.
Added:
trunk/gcc/testsuite/g++.dg/torture/pr87014.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.md
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/87029] Add -Wredundant-move warning
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=86981,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=67906,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=81159
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
See also: bug 67906 and bug 81159
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Subject: [Bug c++/49974] missing warning for indirectly returning reference to local/temporary
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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| |a/show_bug.cgi?id=986,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=52901
--- Comment #10 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Manuel López-Ibáñez from comment #1)
> Isn't this related to PR986?
(In reply to Jonathan Wakely from comment #2)
> Maybe related, but not the same.
So still worth putting under "See Also" then.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49974
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=86982
--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #4)
> As pointed out in PR 52901 comment 3, this missing warning is likely to bite
> people misusing std::move like so:
>
> X&& f()
> {
> X x;
> return std::move(x);
> }
I created PR 86982 for the special cases of std::move and std::forward, as I
think they're important.
This bug is for the more general case.
>From gcc-bugs-return-613171-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 20:03:18 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/704] --help and --version
Date: Mon, 20 Aug 2018 20:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=704
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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URL| |https://gcc.gnu.org/ml/gcc-
| |patches/2018-08/msg01104.ht
| |ml
CC| |iains at gcc dot gnu.org
--- Comment #14 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #13)
> gcc-ar, gcc-nm, and gcc-ranlib all fail for me when passed --help or
> --version like this:
>
> /usr/local/bin/gcc-ranlib: Cannot find plugin 'liblto_plugin.so'
>
> IMO the --help or --version output should be printed before looking for the
> plugin.
Iain Sandoe has a patch for this:
https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01104.html
>From gcc-bugs-return-613172-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 20:34:22 2018
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From: "meissner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87033] New: The compiler does not generate the LWAX instruction
Date: Mon, 20 Aug 2018 20:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87033
Bug ID: 87033
Summary: The compiler does not generate the LWAX instruction
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: meissner at gcc dot gnu.org
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Created attachment 44566
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44566&action=edit
Simple test case to show the bug
The compiler does not generate LWAX instruction to load up a 32-bit integer
value and sign extend it to 64-bits. This is due to the constraint for
extendsi<mode>2 for the LWA being just 'Y' (offset addressing using DS mode
instruction format) and it should be 'YZ'.
>From gcc-bugs-return-613173-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 20:36:58 2018
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Subject: [Bug target/87033] The compiler does not generate the LWAX instruction
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Michael Meissner <meissner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |powerpc64-linux-gnu-*,
| |powerpc64le-linux-gnu-*
CC| |dje at gcc dot gnu.org,
| |meissner at gcc dot gnu.org,
| |segher at gcc dot gnu.org,
| |wschmidt at gcc dot gnu.org
Host| |powerpc64-linux-gnu-*,
| |powerpc64le-linux-gnu-*
Build| |powerpc64-linux-gnu-*,
| |powerpc64le-linux-gnu-*
--- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> ---
It looks like GCC 8 and GCC 7 are probably not generating LWAX also.
>From gcc-bugs-return-613174-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 20:52:54 2018
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
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--- Comment #15 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Wilco from comment #13)
> It seems the safest way
> to split an instruction is to place the new instructions next to each other.
combine can only place new insns at i2 and i3, in either order. There is
code to figure out which way (if any) works; apparently it doesn't work here.
>From gcc-bugs-return-613175-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 20:58:47 2018
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
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--- Comment #16 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Wilco from comment #14)
> Note there is also an issue with costs, if the cost is zero then it seems to
> behave like infinite cost.
0 means unknown cost. Any known cost is treated as at least as good as
unknown cost.
> It would be better to properly cost an
> instruction sequence given there is a new interface for this now.
Yup.
> If the
> cost is still zero, it could get the default cost rather than being treated
> like infinite cost, resulting in non-optimal replacements.
Treating unknown cost as minimal cost is still non-optimal. It might work
better for your case of course. But it means for example that combine will
modify parallels less often.
>From gcc-bugs-return-613176-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 21:07:26 2018
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/84889] Ideas on revamping how we format diagnostics
Date: Mon, 20 Aug 2018 21:07:00 -0000
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--- Comment #11 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Author: dmalcolm
Date: Mon Aug 20 21:06:46 2018
New Revision: 263675
URL: https://gcc.gnu.org/viewcvs?rev=263675&root=gcc&view=rev
Log:
Add support for grouping of related diagnostics (PR other/84889)
We often emit logically-related groups of diagnostics.
A relatively simple case is this:
if (warning_at (body_loc, OPT_Wmultistatement_macros,
"macro expands to multiple statements"))
inform (guard_loc, "some parts of macro expansion are not guarded by "
"this %qs clause", guard_tinfo_to_string (keyword));
where the "note" diagnostic issued by the "inform" call
is guarded by the -Wmultistatement_macros warning.
More complicated examples can be seen in the C++ frontend,
where e.g. print_z_candidates can lead to numerous "note"
diagnostics being emitted.
I'm looking at various ways to improve how we handle such related
diagnostics, but, prior to this patch, there was no explicit
relationship between these diagnostics: the diagnostics subsystem
had no way of "knowing" that these were related.
This patch introduces a simple way to group the diagnostics:
an auto_diagnostic_group class: all diagnostics emitted within
the lifetime of an auto_diagnostic_group instance are logically
grouped.
Hence in the above example, the two diagnostics can be grouped
by simply adding an auto_diagnostic_group instance:
auto_diagnostic_group d;
if (warning_at (body_loc, OPT_Wmultistatement_macros,
"macro expands to multiple statements"))
inform (guard_loc, "some parts of macro expansion are not guarded by "
"this %qs clause", guard_tinfo_to_string (keyword));
Some more awkard cases are of the form:
if (some_condition
&& warning_at (...)
&& more_conditions)
inform (...);
which thus need restructuring to:
if (some_condition)
{
auto_diagnostic_group d;
warning_at (...);
if (more_conditions)
inform (...);
}
so that the lifetime of the auto_diagnostic_group groups the
warning_at and the inform call.
Nesting is handled by simply tracking a nesting depth within the
diagnostic_context.: all diagnostics are treated as grouped until the
final auto_diagnostic_group is popped.
diagnostic.c uses this internally, so that all diagnostics are part of
a group - those that are "by themselves" are treated as being part of
a group with one element.
The diagnostic_context gains optional callbacks for displaying the
start of a group (when the first diagnostic is emitted within it), and
the end of a group (for when the group was non-empty); these callbacks
are unused by default, but a test plugin demonstrates them (and verifies
that the machinery is working).
As noted above, I'm looking at various ways to use the grouping to
improve how we output the diagnostics.
FWIW, I experimented with a more involved implementation, of the form:
diagnostic_group d;
if (d.warning_at (body_loc, OPT_Wmultistatement_macros,
"macro expands to multiple statements"))
d.inform (guard_loc, "some parts of macro expansion are not guarded by "
"this %qs clause", guard_tinfo_to_string (keyword));
which had the advantage of allowing auto-detection of the places where
groups were needed (by converting ::warning_at's return type to bool),
but it was a much more invasive patch, especially when dealing with
the places in the C++ frontend that can emit numerous notes after
an error or warning (and thus having to pass the group around)
Hence I went with this simpler approach.
gcc/c-family/ChangeLog:
PR other/84889
* c-attribs.c (common_handle_aligned_attribute): Add
auto_diagnostic_group instance.
* c-indentation.c (warn_for_misleading_indentation): Likewise.
* c-opts.c (c_common_post_options): Likewise.
* c-warn.c (warn_logical_not_parentheses): Likewise.
(warn_duplicated_cond_add_or_warn): Likewise.
(warn_for_multistatement_macros): Likewise.
gcc/c/ChangeLog:
PR other/84889
* c-decl.c (pushtag): Add auto_diagnostic_group instance.
(diagnose_mismatched_decls): Likewise, in various places.
(warn_if_shadowing): Likewise.
(implicit_decl_warning): Likewise.
(implicitly_declare): Likewise.
(undeclared_variable): Likewise.
(declare_label): Likewise.
(grokdeclarator): Likewise.
(start_function): Likewise.
* c-parser.c (c_parser_declaration_or_fndef): Likewise.
(c_parser_parameter_declaration): Likewise.
(c_parser_binary_expression): Likewise.
* c-typeck.c (c_expr_sizeof_expr): Likewise.
(parser_build_binary_op): Likewise.
(build_unary_op): Likewise.
(error_init): Likewise.
(pedwarn_init): Likewise.
(warning_init): Likewise.
(convert_for_assignment): Likewise.
gcc/cp/ChangeLog:
PR other/84889
* call.c (build_user_type_conversion_1): Add auto_diagnostic_group
instance(s).
(print_error_for_call_failure): Likewise.
(build_op_call_1): Likewise.
(build_conditional_expr_1): Likewise.
(build_new_op_1): Likewise.
(build_op_delete_call): Likewise.
(convert_like_real): Likewise.
(build_over_call): Likewise.
(build_new_method_call_1): Likewise.
(joust): Likewise.
* class.c (check_tag): Likewise.
(finish_struct_anon_r): Likewise.
(one_inherited_ctor): Likewise.
(finalize_literal_type_property): Likewise.
(explain_non_literal_class): Likewise.
(find_flexarrays): Likewise.
(resolve_address_of_overloaded_function): Likewise.
* constexpr.c (ensure_literal_type_for_constexpr_object): Likewise.
(is_valid_constexpr_fn): Likewise.
(cx_check_missing_mem_inits): Likewise.
* cp-gimplify.c (cp_genericize_r): Likewise.
* cvt.c (maybe_warn_nodiscard): Likewise.
* decl.c (warn_extern_redeclared_static): Likewise.
(check_redeclaration_exception_specification): Likewise.
(check_no_redeclaration_friend_default_args): Likewise.
(duplicate_decls): Likewise.
(redeclaration_error_message): Likewise.
(warn_misplaced_attr_for_class_type): Likewise.
* decl2.c (finish_static_data_member_decl): Likewise.
(no_linkage_error): Likewise.
(cp_warn_deprecated_use): Likewise.
* error.c (qualified_name_lookup_error): Likewise.
* friend.c (make_friend_class): Likewise.
(do_friend): Likewise.
* init.c (perform_member_init): Likewise.
(build_new_1): Likewise.
(build_vec_delete_1): Likewise.
(build_delete): Likewise.
* lex.c (unqualified_name_lookup_error): Likewise.
* name-lookup.c (check_extern_c_conflict): Likewise.
(inform_shadowed): New function.
(check_local_shadow): Add auto_diagnostic_group instances,
replacing goto "inform_shadowed" label with call to subroutine.
(set_local_extern_decl_linkage): Add auto_diagnostic_group
instance(s).
* parser.c (cp_parser_diagnose_invalid_type_name): Likewise.
(cp_parser_namespace_name): Likewise.
* pt.c (check_specialization_namespace): Likewise.
(check_template_variable): Likewise.
(warn_spec_missing_attributes): Likewise.
(check_explicit_specialization): Likewise.
(process_partial_specialization): Likewise.
(lookup_template_class_1): Likewise.
(finish_template_variable): Likewise.
(do_auto_deduction): Likewise.
* search.c (check_final_overrider): Likewise.
(look_for_overrides_r): Likewise.
* tree.c (maybe_warn_parm_abi): Likewise.
* typeck.c (cxx_sizeof_expr): Likewise.
(cp_build_function_call_vec): Likewise.
(cp_build_binary_op): Likewise.
(convert_for_assignment): Likewise.
(maybe_warn_about_returning_address_of_local): Likewise.
* typeck2.c (abstract_virtuals_error_sfinae): Likewise.
(check_narrowing): Likewise.
gcc/ChangeLog:
PR other/84889
* attribs.c (diag_attr_exclusions): Add auto_diagnostic_group instance.
(decl_attributes): Likewise.
* calls.c (maybe_warn_nonstring_arg): Add auto_diagnostic_group
instance.
* cgraphunit.c (maybe_diag_incompatible_alias): Likewise.
* diagnostic-core.h (class auto_diagnostic_group): New class.
* diagnostic.c (diagnostic_initialize): Initialize the new fields.
(diagnostic_report_diagnostic): Handle the first diagnostics within
a group.
(emit_diagnostic): Add auto_diagnostic_group instance.
(inform): Likewise.
(inform_n): Likewise.
(warning): Likewise.
(warning_at): Likewise.
(warning_n): Likewise.
(pedwarn): Likewise.
(permerror): Likewise.
(error): Likewise.
(error_n): Likewise.
(error_at): Likewise.
(sorry): Likewise.
(fatal_error): Likewise.
(internal_error): Likewise.
(internal_error_no_backtrace): Likewise.
(auto_diagnostic_group::auto_diagnostic_group): New ctor.
(auto_diagnostic_group::~auto_diagnostic_group): New dtor.
* diagnostic.h (struct diagnostic_context): Add fields
"diagnostic_group_nesting_depth",
"diagnostic_group_emission_count", "begin_group_cb",
"end_group_cb".
* gimple-ssa-isolate-paths.c (find_implicit_erroneous_behavior):
Add auto_diagnostic_group instance(s).
(find_explicit_erroneous_behavior): Likewise.
* gimple-ssa-warn-alloca.c (pass_walloca::execute): Likewise.
* gimple-ssa-warn-restrict.c (maybe_diag_offset_bounds): Likewise.
* gimplify.c (warn_implicit_fallthrough_r): Likewise.
(gimplify_va_arg_expr): Likewise.
* hsa-gen.c (HSA_SORRY_ATV): Likewise.
(HSA_SORRY_AT): Likewise.
* ipa-devirt.c (compare_virtual_tables): Likewise.
(warn_odr): Likewise.
* multiple_target.c (expand_target_clones): Likewise.
* opts-common.c (cmdline_handle_error): Likewise.
* reginfo.c (globalize_reg): Likewise.
* substring-locations.c (format_warning_n_va): Likewise.
* tree-inline.c (expand_call_inline): Likewise.
* tree-ssa-ccp.c (pass_post_ipa_warn::execute): Likewise.
* tree-ssa-loop-niter.c
(do_warn_aggressive_loop_optimizations): Likewise.
* tree-ssa-uninit.c (warn_uninit): Likewise.
* tree.c (warn_deprecated_use): Likewise.
gcc/testsuite/ChangeLog:
PR other/84889
* gcc.dg/plugin/diagnostic-group-test-1.c: New test.
* gcc.dg/plugin/diagnostic_group_plugin.c: New test.
* gcc.dg/plugin/plugin.exp (plugin_test_list): Add the new tests.
Added:
trunk/gcc/testsuite/gcc.dg/plugin/diagnostic-group-test-1.c
trunk/gcc/testsuite/gcc.dg/plugin/diagnostic_group_plugin.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/attribs.c
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c-attribs.c
trunk/gcc/c-family/c-indentation.c
trunk/gcc/c-family/c-opts.c
trunk/gcc/c-family/c-warn.c
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-decl.c
trunk/gcc/c/c-parser.c
trunk/gcc/c/c-typeck.c
trunk/gcc/calls.c
trunk/gcc/cgraphunit.c
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/cp/class.c
trunk/gcc/cp/constexpr.c
trunk/gcc/cp/cp-gimplify.c
trunk/gcc/cp/cvt.c
trunk/gcc/cp/decl.c
trunk/gcc/cp/decl2.c
trunk/gcc/cp/error.c
trunk/gcc/cp/friend.c
trunk/gcc/cp/init.c
trunk/gcc/cp/lex.c
trunk/gcc/cp/name-lookup.c
trunk/gcc/cp/parser.c
trunk/gcc/cp/pt.c
trunk/gcc/cp/search.c
trunk/gcc/cp/tree.c
trunk/gcc/cp/typeck.c
trunk/gcc/cp/typeck2.c
trunk/gcc/diagnostic-core.h
trunk/gcc/diagnostic.c
trunk/gcc/diagnostic.h
trunk/gcc/gimple-ssa-isolate-paths.c
trunk/gcc/gimple-ssa-warn-alloca.c
trunk/gcc/gimple-ssa-warn-restrict.c
trunk/gcc/gimplify.c
trunk/gcc/hsa-gen.c
trunk/gcc/ipa-devirt.c
trunk/gcc/multiple_target.c
trunk/gcc/opts-common.c
trunk/gcc/reginfo.c
trunk/gcc/substring-locations.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/plugin/plugin.exp
trunk/gcc/tree-inline.c
trunk/gcc/tree-ssa-ccp.c
trunk/gcc/tree-ssa-loop-niter.c
trunk/gcc/tree-ssa-uninit.c
trunk/gcc/tree.c
>From gcc-bugs-return-613177-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 21:23:56 2018
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/84889] Ideas on revamping how we format diagnostics
Date: Mon, 20 Aug 2018 21:23:00 -0000
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--- Comment #12 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Another commit related to this: r263564 (add labeling of source ranges)
>From gcc-bugs-return-613178-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 22:06:19 2018
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From: "jsm28 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87023] It's always false, when c_fully_fold_internal deal with C_MAYBE_CONST_EXPR.
Date: Mon, 20 Aug 2018 22:06:00 -0000
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Joseph S. Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
This is not a bug. The comment on c_fully_fold_internal explains its
semantics, which only ever involve clearing *MAYBE_CONST_OPERANDS and
*MAYBE_CONST_ITSELF (pointers to variables that may have been set to true in a
caller and then are cleared, recursively, in any nested call that discovers a
reason for the expression not to be an integer constant expression). Please
see also the comment on c_fully_fold where it says "(*MAYBE_CONST should
typically be set to true by callers before calling this function.)".
Please use the gcc-help mailing list in future to ask questions about code and
reserve Bugzilla for when you have an actual bug in GCC to report.
>From gcc-bugs-return-613179-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 22:25:38 2018
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Subject: [Bug c++/81761] assembler error on __func__ et al. on attribute target overloads
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at redhat dot com,
| |nathan at acm dot org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing c++ FE maintainers
>From gcc-bugs-return-613181-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 22:27:19 2018
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Subject: [Bug c++/45963] inconsistent and poor array initialization diagnostic
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
>From gcc-bugs-return-613180-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 22:27:15 2018
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
Date: Mon, 20 Aug 2018 22:27:00 -0000
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--- Comment #17 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Please do the combine dumps with details enabled; these are pretty useless.
(-fdump-rtl-combine-all)
A C testcase would be very helpful, too (or some magic configure command
to run on some cfarm machine).
>From gcc-bugs-return-613182-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 22:32:33 2018
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
--- Comment #7 from Eric Gallager <egallager at gcc dot gnu.org> ---
Removing from WAITING since the patch was reported to work
>From gcc-bugs-return-613183-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 22:35:49 2018
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Subject: [Bug target/54006] __atomic_always_lock_free inconsistent with __GCC_ATOMIC_INT_LOCK_FREE et al. on crisv32 and hppa
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |UNCONFIRMED
Last reconfirmed|2017-07-28 00:00:00 |
Ever confirmed|1 |0
--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
I guess I'll put it back in UNCONFIRMED instead of leaving it in WAITING...
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Subject: [Bug target/54006] __atomic_always_lock_free inconsistent with __GCC_ATOMIC_INT_LOCK_FREE et al. on crisv32 and hppa
Date: Mon, 20 Aug 2018 22:40:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dave.anglin at bell dot net,
| |law at redhat dot com,
| |schwab@linux-m68k.org
--- Comment #9 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Hans-Peter Nilsson from comment #0)
> Created attachment 27820 [details]
> Testcase suitable for gcc.dg/torture
>
> See attached test-case, which fails for crisv32-axis-linux-gnu and
> "crisv32-elf -munaligned-atomic-may-use-library" and likely for e.g. m68k
> coldfire and definitely for hppa*-* (only library, no patterns).
cc-ing maintainers for those targets
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87034] New: [9 Regression] missing -Wformat-overflow on a sprintf %s with a wide string
Date: Mon, 20 Aug 2018 22:54:00 -0000
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Bug ID: 87034
Summary: [9 Regression] missing -Wformat-overflow on a sprintf
%s with a wide string
Product: gcc
Version: 9.0
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GCC 8 diagnoses the buffer overflow in the test case below, albeit with a
message that isn't entirely accurate. However, as a result of r263607 GCC 9 no
longer does.
$ cat f.c && gcc -O2 -S -Wall f.c
typedef __WCHAR_TYPE__ wchar_t;
extern int sprintf (char*, const char*, ...);
struct S
{
char a[2];
void (*pf)(void);
};
void test (struct S *p)
{
const char *q = (char*)L"\x41424344\x45464748";
sprintf (p->a, "%s", q);
}
f.c: In function ‘test’:
f.c:15:21: warning: ‘sprintf’ writing a terminating nul past the end of the
destination [-Wformat-overflow=]
sprintf (p->a, "%s", q);
^
f.c:15:3: note: ‘sprintf’ output 3 bytes into a destination of size 2
sprintf (p->a, "%s", q);
^~~~~~~~~~~~~~~~~~~~~~~
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Subject: [Bug tree-optimization/87034] [9 Regression] missing -Wformat-overflow on a sprintf %s with a wide string
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--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Mon Aug 20 23:03:55 2018
New Revision: 263676
URL: https://gcc.gnu.org/viewcvs?rev=263676&root=gcc&view=rev
Log:
PR tree-optimization/87034 - missing -Wformat-overflow on a sprintf %s with a
wide string
gcc/testsuite/ChangeLog:
* gcc.dg/builtin-sprintf-warn-20.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-20.c
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/54006] __atomic_always_lock_free inconsistent with __GCC_ATOMIC_INT_LOCK_FREE et al. on crisv32 and hppa
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John David Anglin <danglin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |danglin at gcc dot gnu.org
--- Comment #10 from John David Anglin <danglin at gcc dot gnu.org> ---
The test passes on hppa. The hppa-linux target has a kernel helper to
implement compare and swap. The hpux target isn't "lock free".
There is a debate as to whether the linux implementation Is "lock free"
or not. See PR83638.
>From gcc-bugs-return-613187-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Aug 20 23:06:11 2018
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Subject: [Bug target/87031] nios2 optimization for size - two cases of regression relatively to 5.3.0
Date: Mon, 20 Aug 2018 23:06:00 -0000
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--- Comment #2 from Michael_S <already5chosen at yahoo dot com> ---
After playing with the 2nd case on godbolt I found that it's not target
specific.
The regression occurred at all targets between gcc6 and gcc7.
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Subject: [Bug testsuite/67958] The tests changed by r223498 now FAILs on darwin
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--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Dominique d'Humieres from comment #4)
> > > Created attachment 39731 [details]
> > > Patch fixing the failures with the patches for pr71767
> >
> > please send this patch to gcc-patches for review
>
> This patch has never been intended to be submitted for review: it does not
> take into account comment 2.
can't that part be done separately?
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Subject: [Bug preprocessor/60723] Line directives with incorrect system header flag
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--- Comment #30 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Steve Ellcey from comment #29)
> I posted this question on gcc@gcc.gnu.org and got not response so I thought
> I would ask here on the bug report.
>
> I am trying to understand the status of this bug and the patch
> that fixes it. It looks like a patch was submitted and checked
> in for 5.0 to fix the problem reported and I see the new
> behavior caused by the patch in GCC 5.X compilers. This behavior
> caused a number of issues with configures and scripts that examined
> preprocessed output as is mentioned in this bug report.
> There was a later bug, 64864, complaining about the behavior and
> that was closed as invalid.
>
> But when I look at GCC 6.X or ToT (7.X) compilers I do not see the same
> behavior as 5.X. Was this patch reverted or was a new patch submitted
> that undid some of this patches behavior? I couldn't find any revert or
> new patch to replace the original one so I am not sure when or why
> the code changed back after the 5.X releases.
>
> Here is a test case that I am preprocessing with g++ -E:
>
> #include <stdbool.h>
> class foo {
> void operator= ( bool bit);
> operator bool() const;
> };
>
> GCC 5.4 breaks up the operator delcarations with line markers and GCC 6.2
> does not.
This is the right link for where it is in the archives, right?
https://gcc.gnu.org/ml/gcc/2016-11/msg00116.html
Probably got lost in the change-of-the-month rollover...
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Subject: [Bug testsuite/62234] warnings/errors from LTO cannot be tested
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--- Comment #10 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #9)
> (In reply to David Malcolm from comment #6)
> > I added support for this in r256801:
> > dg-lto-warning and dg-lto-message
> > https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00257.html
>
> Awesome! It might be worth an email to the dev list to let people aware of
> the limitation know about this enhancement -- I know of least two bugs that
> I should add tests for now that this works.
>
> It might also be helpful to update the README and mention this and the other
> dg-lto- directives. Let me post one.
Did you do this? If so, link?
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--- Comment #2 from Michael Meissner <meissner at gcc dot gnu.org> ---
Author: meissner
Date: Mon Aug 20 23:46:37 2018
New Revision: 263678
URL: https://gcc.gnu.org/viewcvs?rev=263678&root=gcc&view=rev
Log:
[gcc]
2018-08-20 Michael Meissner <meissner@linux.ibm.com>
PR target/87033
* config/rs6000/rs6000.md (extendsi<mode>2): Change constraints
from 'Y' to 'YZ' to enable the LWAX instruction to be generated
for indexed loads.
[gcc/testsuite]
2018-08-20 Michael Meissner <meissner@linux.ibm.com>
PR target/87033
* gcc.target/powerpc/pr87033.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/powerpc/pr87033.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/rs6000.md
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-613193-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 00:07:11 2018
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Subject: [Bug c/87023] It's always false, when c_fully_fold_internal deal with C_MAYBE_CONST_EXPR.
Date: Tue, 21 Aug 2018 00:07:00 -0000
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--- Comment #2 from hhj <He.Hongjun at zte dot com.cn> ---
(In reply to Joseph S. Myers from comment #1)
> This is not a bug. The comment on c_fully_fold_internal explains its
> semantics, which only ever involve clearing *MAYBE_CONST_OPERANDS and
> *MAYBE_CONST_ITSELF (pointers to variables that may have been set to true in
> a caller and then are cleared, recursively, in any nested call that
> discovers a reason for the expression not to be an integer constant
> expression). Please see also the comment on c_fully_fold where it says
> "(*MAYBE_CONST should typically be set to true by callers before calling
> this function.)".
>
> Please use the gcc-help mailing list in future to ask questions about code
> and reserve Bugzilla for when you have an actual bug in GCC to report.
thanks
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Subject: [Bug translation/80191] diagnostic placeholder "new initializer" must be marked for translation
Date: Tue, 21 Aug 2018 02:46:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-08-21
Ever confirmed|0 |1
--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #7)
> Changing component to translation, but leaving UNCONFIRMED since there seems
> to be disagreement
Putting in WAITING in the hopes that someone else will decide one way or
another whether this bug is valid or not.
>From gcc-bugs-return-613195-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 05:58:51 2018
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Subject: [Bug target/86832] [8/9 Regression] GCC v8.2.0 tries to use native TLS with -fstack-protector-strong on Windows (mingw-w64)
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Stefan Weil <sw at weilnetz dot de> changed:
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CC| |sw at weilnetz dot de
--- Comment #4 from Stefan Weil <sw at weilnetz dot de> ---
Related bug reports for other software:
https://sourceforge.net/p/mingw-w64/bugs/755/
http://lists.nongnu.org/archive/html/qemu-devel/2018-08/msg04140.html
>From gcc-bugs-return-613196-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 06:23:21 2018
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Subject: [Bug c++/87035] New: Can't shadow global const int with unnamed enum in class
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Bug ID: 87035
Summary: Can't shadow global const int with unnamed enum in
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const int N = 5;
struct X {
int Array[N]; // int[5]
enum { N }; // fails, redeclaration
};
This is well-formed, as the enum value N is in another scope and so shadows
::N. Removing the array declaration makes the code also compile.
>From gcc-bugs-return-613197-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 06:34:06 2018
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Subject: [Bug c++/87035] Can't shadow global const int with unnamed enum in class
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Actually no this is invalid code at least according to the standard. Since N
definition has to be the same when used and at the end of the scope. In this
case, you have a different one.
The error message is very clear about that too:
t8.cc:5:10: error: declaration of ‘N’ [-fpermissive]
enum { N }; // fails, redeclaration
^
t8.cc:1:11: error: changes meaning of ‘N’ from ‘const int N’ [-fpermissive]
const int N = 5;
^
Maybe just the use of N is not in the error message.
>From gcc-bugs-return-613198-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 06:58:36 2018
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Subject: [Bug c++/87035] Can't shadow global const int with unnamed enum in class
Date: Tue, 21 Aug 2018 06:58:00 -0000
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--- Comment #2 from Nicolas Lesser <blitzrakete at gmail dot com> ---
Huh, interesting. TIL. Where's that rule in the standard? Because I can't find
it in [class.mem]. Is it somewhere else or did I just overlook it?
>From gcc-bugs-return-613199-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 07:06:15 2018
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Subject: [Bug c++/87035] Can't shadow global const int with unnamed enum in class
Date: Tue, 21 Aug 2018 07:06:00 -0000
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Nicolas Lesser from comment #2)
> Huh, interesting. TIL. Where's that rule in the standard? Because I can't
> find it in [class.mem]. Is it somewhere else or did I just overlook it?
C++98 paragraph numbers:
See 3.3.6/1
[...]
2) A name N used in a class S shall refer to the same declaration
in its context and when reevaluated in the completed scope of
S. No diagnostic is required for a violation of this rule.
I think that is the same as [basic.scope.class].
>From gcc-bugs-return-613200-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 07:07:54 2018
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Subject: [Bug c++/87035] Can't shadow global const int with unnamed enum in class
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--- Comment #4 from Nicolas Lesser <blitzrakete at gmail dot com> ---
Nice, thank you!
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87035] Can't shadow global const int with unnamed enum in class
Date: Tue, 21 Aug 2018 07:08:00 -0000
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--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
[basic.scope.class] p2:
"A name N used in a class S shall refer to the same declaration in its context
and when re-evaluated in the completed scope of S. No diagnostic is required
for a violation of this rule."
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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--- Comment #18 from Segher Boessenkool <segher at gcc dot gnu.org> ---
I have a patch.
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Subject: [Bug target/86987] ICE in simplify_binary_operation_1, at simplify-rtx.c:3515 on ppc64le
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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Subject: [Bug target/86832] [8/9 Regression] GCC v8.2.0 tries to use native TLS with -fstack-protector-strong on Windows (mingw-w64)
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Subject: [Bug other/86834] [9 regression] several tests fail with ICE starting with r263245
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Has this been fixed? If so please close.
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Subject: [Bug tree-optimization/86835] [8 Regression] Bogus "is used uninitialized" warning with -ffast-math
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug c++/86836] internal compiler error on structured bindings with shadow parameter on templated function
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Known to work| |9.0
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk(?). Is this a regression?
>From gcc-bugs-return-613208-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 07:40:16 2018
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Subject: [Bug middle-end/86840] __attribute__((optimize("exceptions"))) is silently ignored
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, we have DECL_FUNCTION_PERSONALITY which is used for keying. I guess
"late" processing of -fexceptions doesn't cause that to be "set". So likely
the
optimize attributes are not processed at the time the personality is set.
>From gcc-bugs-return-613209-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 07:41:18 2018
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Subject: [Bug tree-optimization/86844] [8/9 regression] wrong code caused by store merging pass
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug other/87036] New: -O1/-O2 affects floating point precision on at least i686 and ppc64el
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87036
Bug ID: 87036
Summary: -O1/-O2 affects floating point precision on at least
i686 and ppc64el
Product: gcc
Version: 6.4.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: doko at debian dot org
Target Milestone: ---
[forwarded from http://bugs.debian.org/906753]
no difference in the results on x86_64-linux-gnu, the bug submitter claims that
clang 6.0 is working as expected. Seen on at least i686 and ppc64el. Same
behaviour down to GCC 5 on both archs.
on ppc64el:
$ g++ -O0 tst.cc && ./a.out
$ g++ -O2 tst.cc && ./a.out
different mass sq values: 2.42 2.42
difference is : 3.55271e-15
on i686:
$ g++ -O0 tst.cc && ./a.out
$ g++ -O2 tst.cc && ./a.out
different mass sq values: 2.42 2.42
difference is : 1.77636e-15
$cat tst.cc
#include <cmath>
#include <algorithm> // for swap
#include <iostream>
namespace HepMC {
class FourVector {
public:
double m_x, m_y, m_z, m_t;
FourVector( double xin, double yin, double zin, double tin=0) : m_x(xin),
m_y(yin), m_z(zin), m_t(tin) {}
inline double m2() const {
return m_t*m_t - (m_x*m_x + m_y*m_y + m_z*m_z);
}
inline double m() const {
double mm = m2();
return mm < 0.0 ? -std::sqrt(-mm) : std::sqrt(mm);
}
};
} // HepMC
int main()
{
double eps = 1.e-15; // allowed differnce between doubles
// FourVector
HepMC::FourVector vector(1.1,2.2,3.3,4.4);
HepMC::FourVector v4 (1.1,2.2,3.3,4.4);
//vector = v4;
double masssq1 = v4.m2();
double mass1 = v4.m();
double masssq2 = vector.m2();
double mass2 = vector.m();
if( fabs( masssq1 - masssq2 ) > eps ) {
std::cout << "different mass sq values: " << masssq1 << " " << masssq2 <<
std::endl;
std::cout << "difference is : " << ( masssq1 - masssq2 ) << std::endl;
}
return 0;
}
>From gcc-bugs-return-613211-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 07:46:20 2018
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Subject: [Bug jit/86845] libgccjit.so.0.0.1 build error with in-tree isl: relocation R_X86_64_32 against `.rodata.str1.8' can not be used when making a shared object; recompile with -fPIC
Date: Tue, 21 Aug 2018 07:46:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |build
CC| |dmalcolm at gcc dot gnu.org
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Well, looks like all the static libs of the in-tree prerequesites have to be
compiled with -fPIC. We have
host_modules= { module= mpfr; lib_path=src/.libs; bootstrap=true;
extra_configure_flags='--disable-shared
@extra_mpfr_configure_flags@';
extra_make_flags='AM_CFLAGS="-DNO_ASM"';
no_install= true; };
host_modules= { module= mpc; lib_path=src/.libs; bootstrap=true;
extra_configure_flags='--disable-shared
@extra_mpc_gmp_configure_flags@ @extra_mpc_mpfr_configure_flags@
--disable-maintainer-mode';
no_install= true; };
host_modules= { module= isl; lib_path=.libs; bootstrap=true;
extra_configure_flags='--disable-shared
@extra_isl_gmp_configure_flags@';
extra_make_flags='V=1';
no_install= true; };
David? This is really only required for libjit ... :/
>From gcc-bugs-return-613212-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 07:53:23 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/87036] -O1/-O2 affects floating point precision on at least i686 and ppc64el
Date: Tue, 21 Aug 2018 07:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87036
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For powerpc at least this is due to fma. Use -ffp-contract=off to turn it off.
>From gcc-bugs-return-613213-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 07:54:23 2018
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Subject: [Bug other/86834] [9 regression] several tests fail with ICE starting with r263245
Date: Tue, 21 Aug 2018 07:54:00 -0000
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Thomas Preud'homme <thopre01 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
As pointed by Jakub, commit was reverted in r263252. New iteration of the patch
(currently still in testing) has been checked it doesn't have this regression.
Best regards,
Thomas
>From gcc-bugs-return-613214-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 07:55:45 2018
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Subject: [Bug other/87036] -O1/-O2 affects floating point precision on at least i686 and ppc64el
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For x86, this is due to using 80bit fp. See PR 323 for that one.
>From gcc-bugs-return-613215-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 07:55:57 2018
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Subject: [Bug libstdc++/87037] New: vector :: erase return value should be marked "must use"
Date: Tue, 21 Aug 2018 07:55:00 -0000
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Bug ID: 87037
Summary: vector :: erase return value should be marked "must
use"
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
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Given the following C++ source code
# include <vector>
using namespace std;
void f( vector < int > & vec)
{
for (auto i = vec.begin(); i != vec.end(); ++i)
{
vec.erase( i);
}
}
then there is an obvious bug that the return value from the erase
isn't used for loop control. gcc seems strangely silent on the issue:
$ ~/gcc/results.263644/bin/gcc -c -g -O2 -Wall -Wextra aug21a.cc
$
>From gcc-bugs-return-613216-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 07:56:07 2018
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Subject: [Bug other/87036] -O1/-O2 affects floating point precision on at least i686 and ppc64el
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--- Comment #3 from Matthias Klose <doko at ubuntu dot com> ---
On 21.08.2018 09:53, pinskia at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87036
>
> --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
> For powerpc at least this is due to fma. Use -ffp-contract=off to turn it off.
yes, -ffp-contract=off helps.
>From gcc-bugs-return-613217-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 08:09:29 2018
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Subject: [Bug libstdc++/87037] vector :: erase return value should be marked "must use"
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
There's nothing strange about that at all. There are plenty of uses for erase
where it's totally fine to ignore the return value.
auto iter = std::find(v.begin(), v.end(), val);
if (iter != v.end())
{
do_something(*iter);
v.erase(iter);
}
How do you propose to mark it so it only complains when you have a bug?
>From gcc-bugs-return-613218-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 08:26:01 2018
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Subject: [Bug c++/87035] Add "note: used here" to permerror about redeclaration changing the meaning of a name at class scope
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87035
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|RESOLVED |NEW
Last reconfirmed| |2018-08-21
Resolution|INVALID |---
Summary|Can't shadow global const |Add "note: used here" to
|int with unnamed enum in |permerror about
|class |redeclaration changing the
| |meaning of a name at class
| |scope
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yup, this is ill-formed; no diagnostic required.(In reply to Andrew Pinski from
comment #1)
> Actually no this is invalid code at least according to the standard. Since
Yup, ill-formed; no diagnostic required. GCC has been getting smarter about
diagnosing these cases.
> Maybe just the use of N is not in the error message.
Yes, maybe a note pointing to the use of the name would be useful.
t8.cc:5:10: error: declaration of ‘N’ [-fpermissive]
enum { N }; // fails, redeclaration
^
t8.cc:1:11: error: changes meaning of ‘N’ from ‘const int N’ [-fpermissive]
const int N = 5;
^
t8.cc:4:13: note: used here
int Array[N]; // int[5]
^
Re-opening as a diagnostic bug.
>From gcc-bugs-return-613219-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 08:58:14 2018
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Subject: [Bug middle-end/86121] [9 Regression] missing -Wstringop-overflow on strcpy followed by strcat
Date: Tue, 21 Aug 2018 08:58:00 -0000
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--- Comment #4 from Bernd Edlinger <edlinger at gcc dot gnu.org> ---
Author: edlinger
Date: Tue Aug 21 08:56:11 2018
New Revision: 263693
URL: https://gcc.gnu.org/viewcvs?rev=263693&root=gcc&view=rev
Log:
2018-08-21 Bernd Edlinger <bernd.edlinger@hotmail.de>
PR middle-end/86121
* tree-ssa-strlen.c (adjust_last_stmt): Avoid folding away undefined
behaviour.
testsuite:
2018-08-21 Bernd Edlinger <bernd.edlinger@hotmail.de>
PR middle-end/86121
* gcc.dg/Wstringop-overflow-6.c: Remove xfail.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/Wstringop-overflow-6.c
trunk/gcc/tree-ssa-strlen.c
>From gcc-bugs-return-613220-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 09:22:32 2018
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Subject: [Bug c/87038] New: diagnostics: Please add warning for jumping over initializers with switch/case in C mode
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Bug ID: 87038
Summary: diagnostics: Please add warning for jumping over
initializers with switch/case in C mode
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The other day, I had to debug (production!) code that essentially did this:
void func(int x) {
switch (x) {
case 1: {
int foo = 3;
case 0:
printf("foo is %d\n", foo);
}
}
}
If func is called with 0, “foo†is uninitialized, even though it doesn't look
like it. There's a similar construction with goto:
void func2(int x) {
if (x == 0) goto lbl;
int foo = 3;
lbl:
printf("foo is %d\n", foo);
}
In C++ mode, both constructs are rightfully rejected as an error. However, when
compiling as C, there's not even a warning; sometimes, control flow analysis
may detect that foo is used uninitialized, but not always.
Would it be possible to have a warning in C mode that mirrors the C++ error?
Ie. “jump to case label crosses initialization of 'int foo'â€.
>From gcc-bugs-return-613221-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 09:38:04 2018
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Subject: [Bug c/87038] diagnostics: Please add warning for jumping over initializers with switch/case in C mode
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-21
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Confirmed. Clang warns consistently, even at -O0:
87038.c:5:30: warning: variable 'foo' is used uninitialized whenever switch
case is taken [-Wsometimes-uninitialized]
case 0:
^
87038.c:6:55: note: uninitialized use occurs here
printf("foo is %d\n", foo);
^~~
87038.c:4:25: note: variable 'foo' is declared here
int foo = 3;
^
1 warning generated.
>From gcc-bugs-return-613222-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 09:39:10 2018
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Subject: [Bug c/87038] diagnostics: Please add warning for jumping over initializers with switch/case in C mode
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
And for the goto case Clang says:
87038.c:2:13: warning: variable 'foo' is used uninitialized whenever 'if'
condition is true [-Wsometimes-uninitialized]
if (x == 0) goto lbl;
^~~~~~
87038.c:5:31: note: uninitialized use occurs here
printf("foo is %d\n", foo);
^~~
87038.c:2:9: note: remove the 'if' if its condition is always false
if (x == 0) goto lbl;
^~~~~~~~~~~~~~~~~~~~
87038.c:3:9: note: variable 'foo' is declared here
int foo = 3;
^
1 warning generated.
>From gcc-bugs-return-613223-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:25:04 2018
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Subject: [Bug tree-optimization/86847] [9 Regression] Switch code size growth
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
>From gcc-bugs-return-613224-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:27:21 2018
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Subject: [Bug tree-optimization/86850] ubsan: runtime error: member call on null pointer
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
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CC| |rguenth at gcc dot gnu.org,
| |rsandifo at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Can you post a backtrace? Probably vectorizer code.
>From gcc-bugs-return-613225-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:29:37 2018
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Subject: [Bug tree-optimization/86853] [7/8 Regression] sprintf optimization for wide strings doesn't account for conversion failure
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Known to work| |9.0
Target Milestone|--- |7.4
Summary|sprintf optimization for |[7/8 Regression] sprintf
|wide strings doesn't |optimization for wide
|account for conversion |strings doesn't account for
|failure |conversion failure
Known to fail|9.0 |
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
I assume trunk is fixed. This is a regression.
>From gcc-bugs-return-613226-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:36:36 2018
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Subject: [Bug libstdc++/86860] Reject valid overloads of subclass ostream operator<<
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86860
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
So INVALID?
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Subject: [Bug debug/87039] [8/9 Regression] DW_OP_fbreg used without a frame base on a C++ code w/ -fopenmp
Date: Tue, 21 Aug 2018 10:37:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-21
CC| |aoliva at gcc dot gnu.org,
| |jakub at gcc dot gnu.org,
| |mark at gcc dot gnu.org
Ever confirmed|0 |1
>From gcc-bugs-return-613228-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:37:41 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/86864] [9 Regression] ICE in commit_one_edge_insertion, at cfgrtl.c:2025 since r261795
Date: Tue, 21 Aug 2018 10:37:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
Status|ASSIGNED |NEW
Assignee|marxin at gcc dot gnu.org |unassigned at gcc dot gnu.org
>From gcc-bugs-return-613227-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:37:31 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/87039] New: [8/9 Regression] DW_OP_fbreg used without a frame base on a C++ code w/ -fopenmp
Date: Tue, 21 Aug 2018 10:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87039
Bug ID: 87039
Summary: [8/9 Regression] DW_OP_fbreg used without a frame base
on a C++ code w/ -fopenmp
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: wrong-debug
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
Target Milestone: ---
Starting from r257510, GCC emits debug info about which elfutils is not happy
about:
$ cat filter.ii
template <typename a, typename b, typename d> void e(a, d, b);
template <int f> void g(double[][f]) {
for (int c; c;)
;
}
template <typename, int h, int>
void i(int, int, int, int, int, int, int, int, double[], double[], double *[],
int) {
#pragma omp parallel
{
int j;
double k[1][h];
e(j, h, k);
g(k);
}
}
double *l;
int m;
double n[1], o[1];
void p() { i<char, 1, false>(0, 0, 1, 0, 0, 1, 0, 0, n, o, &l, m); }
$ g++ filter.ii -c -g -O2 -fopenmp &&
/home/marxin/Programming/elfutils/tests/varlocs -e filter.o
module 'filter.o'
[b] CU 'filter.ii'@0
[229] inlined function 'i<char, 1, 0>'@20
[24e] parameter '<unknown>'
<constant value>
[254] parameter '<unknown>'
<constant value>
[25a] parameter '<unknown>'
<constant value>
[260] parameter '<unknown>'
<constant value>
[266] parameter '<unknown>'
<constant value>
[26c] parameter '<unknown>'
<constant value>
[272] parameter '<unknown>'
<constant value>
[278] parameter '<unknown>'
<constant value>
[27e] parameter '<unknown>'
[20,30) {addr(0x38), stack_value}
[28e] parameter '<unknown>'
[20,30) {addr(0x30), stack_value}
[29e] parameter '<unknown>'
[20,30) {addr(0x48), stack_value}
[2ae] parameter '<unknown>'
[20,2f) {addr(0x40)}
[18f] function '_Z1iIcLi1ELi0EEviiiiiiiiPdS0_PS0_i._omp_fn.0'@0
frame_base: XXX zero address
[1a6] parameter '<unknown>'
[0,b) {reg5}
[b,1a) {GNU_entry_value(1) {reg5}, stack_value}
[13d] inlined function 'g<1>'@15
[162] parameter '<unknown>'
[15,1a) {/home/marxin/Programming/elfutils/tests/varlocs: DW_OP_fbreg
used without a frame base
The test-case is isolated from Inkscape program.
>From gcc-bugs-return-613230-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:39:44 2018
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Subject: [Bug target/87040] New: ICE in extract_constrain_insn_cached, at recog.c:2218
Date: Tue, 21 Aug 2018 10:39:00 -0000
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Bug ID: 87040
Summary: ICE in extract_constrain_insn_cached, at recog.c:2218
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
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Reporter: marxin at gcc dot gnu.org
CC: segher at gcc dot gnu.org
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Host: x86_64-linux-gnu
Target: ppc64le-linux-gnu
Following ICEs:
$ ./xgcc -B.
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/20030605-1.c
-fif-conversion2 -Og
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/20030605-1.c:
In function ‘set_bh_page’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/20030605-1.c:12:1:
error: insn does not satisfy its constraints:
12 | }
| ^
(insn 25 0 0 (set (reg:DI 121)
(const_int 4095 [0xfff])) 441 {*movdi_internal64}
(nil))
during RTL pass: ce3
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/20030605-1.c:12:1:
internal compiler error: in extract_constrain_insn_cached, at recog.c:2218
0xfa3b95 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/home/marxin/Programming/gcc/gcc/rtl-error.c:108
0xfa3bf9 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/home/marxin/Programming/gcc/gcc/rtl-error.c:118
0xf47798 extract_constrain_insn_cached(rtx_insn*)
/home/marxin/Programming/gcc/gcc/recog.c:2218
0x17b165d insn_default_length(rtx_insn*)
/home/marxin/Programming/gcc/gcc/config/rs6000/rs6000.md:6831
0xb90531 get_attr_length_1
/home/marxin/Programming/gcc/gcc/final.c:407
0xb90566 get_attr_length(rtx_insn*)
/home/marxin/Programming/gcc/gcc/final.c:425
0x14fb201 rs6000_insn_cost
/home/marxin/Programming/gcc/gcc/config/rs6000/rs6000.c:34085
0xfb2b71 insn_cost(rtx_insn*, bool)
/home/marxin/Programming/gcc/gcc/rtlanal.c:5435
0xb574bb canonicalize_comparison(machine_mode, rtx_code*, rtx_def**)
/home/marxin/Programming/gcc/gcc/expmed.c:6249
0xeab7af prepare_cmp_insn
/home/marxin/Programming/gcc/gcc/optabs.c:3816
0xeafb35 gen_cond_trap(rtx_code, rtx_def*, rtx_def*, rtx_def*)
/home/marxin/Programming/gcc/gcc/optabs.c:5288
0x1a5960f find_cond_trap
/home/marxin/Programming/gcc/gcc/ifcvt.c:4657
0x1a58840 find_if_header
/home/marxin/Programming/gcc/gcc/ifcvt.c:4282
0x1a5b381 if_convert
/home/marxin/Programming/gcc/gcc/ifcvt.c:5405
0x1a5b801 execute
/home/marxin/Programming/gcc/gcc/ifcvt.c:5599
>From gcc-bugs-return-613231-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:43:58 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86869] ICE when taking address of array member of __memx struct pointer
Date: Tue, 21 Aug 2018 10:43:00 -0000
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
#ifndef POINTERS_EXTEND_UNSIGNED
gcc_assert (GET_MODE (x) == to_mode || GET_MODE (x) == VOIDmode);
return x;
#else /* defined(POINTERS_EXTEND_UNSIGNED) */
scalar_int_mode pointer_mode, address_mode, from_mode;
rtx temp;
So clearly avr has to define POINTERS_EXTEND_UNSIGNED in the correct way
and/or the assert needs to be ajdusted for pointer/address_mode of as.
>From gcc-bugs-return-613232-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:46:23 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/86990] [9 Regression] wrong code at -O2 on x86_64-linux-gnu in 64-bit mode
Date: Tue, 21 Aug 2018 10:46:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |8.2.0
Version|unknown |9.0
Keywords| |wrong-code
Last reconfirmed| |2018-08-21
CC| |ebotcazou at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Ever confirmed|0 |1
Summary|wrong code at -O2 on |[9 Regression] wrong code
|x86_64-linux-gnu in 64-bit |at -O2 on x86_64-linux-gnu
|mode |in 64-bit mode
Target Milestone|--- |9.0
Known to fail| |9.0
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r261089.
>From gcc-bugs-return-613233-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:47:10 2018
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Subject: [Bug c++/86875] [8/9 Regression] ICE in tsubst_copy, at cp/pt.c:15478
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86875
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Target Milestone|--- |8.3
>From gcc-bugs-return-613235-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:49:13 2018
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Subject: [Bug tree-optimization/86991] [8/9 Regression] ICE in vectorizable_reduction, at tree-vect-loop.c:6919
Date: Tue, 21 Aug 2018 10:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86991
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-21
CC| |marxin at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Target Milestone|--- |8.3
Summary|internal compiler error: in |[8/9 Regression] ICE in
|vectorizable_reduction, at |vectorizable_reduction, at
|tree-vect-loop.c:6919 |tree-vect-loop.c:6919
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r250382.
>From gcc-bugs-return-613234-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:49:14 2018
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Subject: [Bug target/86877] ICE in vectorizable_load, at tree-vect-stmts.c:8038
Date: Tue, 21 Aug 2018 10:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86877
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
Blocks| |53947
Target Milestone|9.0 |---
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
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Subject: [Bug libstdc++/86860] Reject valid overloads of subclass ostream operator<<
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86860
Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yep, let's close it.
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From: "achurch+gcc at achurch dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/87041] New: GCC 8 regression: -Wformat "reading through null pointer" on unreachable code
Date: Tue, 21 Aug 2018 10:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87041
Bug ID: 87041
Summary: GCC 8 regression: -Wformat "reading through null
pointer" on unreachable code
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: achurch+gcc at achurch dot org
Target Milestone: ---
In GCC 8, the following code compiled with -O1 -Wformat warns about passing
NULL to a %s format token even though the call can never be executed:
extern int printf(const char *, ...);
void foo(void) {
const char * const s = 0;
if (s) printf("%s\n", s);
}
foo.c: In function 'foo':
foo.c:4:5: warning: reading through null pointer (argument 2) [-Wformat=]
if (s) printf("%s\n", s);
^~
This breaks testing macros of the following style, which worked fine through
GCC 7.3.0:
#define CHECK_STREQUAL(value, expected) do { \
const char * const _value = value; \
const char * const _expected = expected; \
if (!_value && _expected) FAIL("Got NULL, expected [%s]", _expected); \
if (_value && !_expected) FAIL("Got [%s], expected NULL", _value); \
if (_value && _expected && strcmp(_value, _expected) != 0) \
FAIL("Got [%s], expected [%s]", _value, _expected); \
} while (0)
Here, passing NULL for the value of "expected" triggers the warning on the
final FAIL() invocation, even though that case will never be executed when
"expected" is NULL.
The warning disappears at -O0 or if the variable is not const (e.g., "const
char *s" instead of "const char * const s").
>From gcc-bugs-return-613238-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 10:56:45 2018
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Subject: [Bug tree-optimization/86891] [9 Regression] wrong code with -O -frerun-cse-after-loop -fno-tree-dominator-opts -fno-tree-fre
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Target Milestone|--- |9.0
>From gcc-bugs-return-613239-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 11:01:13 2018
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Subject: [Bug middle-end/87041] GCC 8 regression: -Wformat "reading through null pointer" on unreachable code
Date: Tue, 21 Aug 2018 11:01:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-21
CC| |jakub at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Started on trunk in r254930 to report the warning.
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Subject: [Bug c++/86900] [8/9 Regression] -gdwarf-5 -O2 -ffunction-sections = assembler error
Date: Tue, 21 Aug 2018 11:02:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Priority|P3 |P2
>From gcc-bugs-return-613241-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 11:03:59 2018
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Subject: [Bug target/86902] [9 Regression] ICE: in as_a, at machmode.h:356 at -O
Date: Tue, 21 Aug 2018 11:03:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Target Milestone|--- |9.0
>From gcc-bugs-return-613243-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 11:05:25 2018
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Subject: [Bug fortran/86907] [9 Regression] bogus warning "No location in expression near"
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Target Milestone|--- |9.0
Summary|[9.0 regression] bogus |[9 Regression] bogus
|warning "No location in |warning "No location in
|expression near" |expression near"
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Subject: [Bug c++/86905] [6/7/8/9 Regression] g++ ICE on valid code: verify_cgraph_node failed
Date: Tue, 21 Aug 2018 11:05:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-checking
Known to work| |4.9.4
Version|unknown |9.0
Target Milestone|--- |6.5
Summary|g++ ICE on valid code: |[6/7/8/9 Regression] g++
|verify_cgraph_node failed |ICE on valid code:
| |verify_cgraph_node failed
Known to fail| |5.1.0
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Subject: [Bug tree-optimization/86850] ubsan: runtime error: member call on null pointer
Date: Tue, 21 Aug 2018 11:07:00 -0000
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--- Comment #2 from David Binderman <dcb314 at hotmail dot com> ---
Indeed it does look like vectorizer code. Here are 20 frames,
found by using the UBSAN_OPTIONS=print_stacktrace=1 option:
../../trunk/gcc/vec.h:1688:5: runtime error: member call on null pointer of
type
'struct vec'
#0 0x2be4a24 in vec<_slp_tree*, va_heap, vl_ptr>::splice(vec<_slp_tree*,
va_
heap, vl_ptr> const&) ../../trunk/gcc/vec.h:1688
#1 0x2be4a24 in vect_build_slp_tree_2 ../../trunk/gcc/tree-vect-slp.c:1492
#2 0x2bd779e in vect_build_slp_tree ../../trunk/gcc/tree-vect-slp.c:1105
#3 0x2bdba6c in vect_build_slp_tree_2 ../../trunk/gcc/tree-vect-slp.c:1257
#4 0x2bd779e in vect_build_slp_tree ../../trunk/gcc/tree-vect-slp.c:1105
#5 0x2bdba6c in vect_build_slp_tree_2 ../../trunk/gcc/tree-vect-slp.c:1257
#6 0x2bd779e in vect_build_slp_tree ../../trunk/gcc/tree-vect-slp.c:1105
#7 0x2bf1e80 in vect_analyze_slp_instance
../../trunk/gcc/tree-vect-slp.c:19
56
#8 0x2bfa002 in vect_analyze_slp(vec_info*, unsigned int)
../../trunk/gcc/tr
ee-vect-slp.c:2154
#9 0x2bfaf63 in vect_slp_analyze_bb_1 ../../trunk/gcc/tree-vect-slp.c:2839
#10 0x2bfaf63 in vect_slp_bb(basic_block_def*)
../../trunk/gcc/tree-vect-slp
.c:2973
#11 0x2c0d5bc in execute ../../trunk/gcc/tree-vectorizer.c:1271
#12 0x1b4e1ac in execute_one_pass(opt_pass*) ../../trunk/gcc/passes.c:2446
#13 0x1b51cf7 in execute_pass_list_1 ../../trunk/gcc/passes.c:2535
#14 0x1b51d3e in execute_pass_list_1 ../../trunk/gcc/passes.c:2536
#15 0x1b51d3e in execute_pass_list_1 ../../trunk/gcc/passes.c:2536
#16 0x1b51e18 in execute_pass_list(function*, opt_pass*)
../../trunk/gcc/pas
ses.c:2546
#17 0xc9d9da in cgraph_node::expand() ../../trunk/gcc/cgraphunit.c:2116
#18 0xca2db4 in expand_all_functions ../../trunk/gcc/cgraphunit.c:2254
#19 0xca2db4 in symbol_table::compile() ../../trunk/gcc/cgraphunit.c:2605
#20 0xcaca6a in symbol_table::finalize_compilation_unit()
../../trunk/gcc/cg
raphunit.c:2698
>From gcc-bugs-return-613245-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 11:12:17 2018
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Subject: [Bug c++/86908] static_cast<BaseTypeWithVirtualMethod*>(&derivedClassObject)->virtualMehod() calls base version of virtualMethod()
Date: Tue, 21 Aug 2018 11:12:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> No, your program has undefined behaviour. To make it valid you either need
> to use std::launder, or use the pointer that is returned by the placement
> new.
>
> The compiler is allowed to assume that the dynamic type of &strategy does
> not change (that's why you need to use std::launder).
You need to use std::launder at every use of the object, right? I wonder
why static_cast<BaseStrategy*>() isn't a good enough "hint" here that
the type of strategy changed (from QOI perspective, std::launder is new).
I guess a better testcase would be to declare strategy as AStrategy
and placement-new BaseStrategy over it or does the standard guaranteee
that AStrategy fits in the storage of BaseStrategy?
>From gcc-bugs-return-613246-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 11:19:08 2018
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
Date: Tue, 21 Aug 2018 11:19:00 -0000
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--- Comment #19 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #16)
> (In reply to Wilco from comment #14)
> > Note there is also an issue with costs, if the cost is zero then it seems to
> > behave like infinite cost.
>
> 0 means unknown cost. Any known cost is treated as at least as good as
> unknown cost.
>
> > It would be better to properly cost an
> > instruction sequence given there is a new interface for this now.
>
> Yup.
>
> > If the
> > cost is still zero, it could get the default cost rather than being treated
> > like infinite cost, resulting in non-optimal replacements.
>
> Treating unknown cost as minimal cost is still non-optimal. It might work
> better for your case of course. But it means for example that combine will
> modify parallels less often.
Well insn_cost() uses COSTS_N_INSNS (1) for instructions with unknown (zero)
costs. That's a reasonable default and gives more accurate cost comparisons,
eg. 0 + 4 vs 0 + 8 now becomes 4 + 4 vs 4 + 8.
With insn_cost() the ldm's get cost 8+8, so the comparison is 4 + 16 vs 8 + 8,
and thus the substitution will happen (though it's not clear it's useful for
the selected CPU).
With those changes I think there will be far fewer cases with unknown costs.
There will be cases where target insn_cost needs to be improved to more
accurately model complex instructions, but that will result in even better
code.
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Subject: [Bug tree-optimization/86850] ubsan: runtime error: member call on null pointer
Date: Tue, 21 Aug 2018 11:19:00 -0000
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--- Comment #3 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 21 Aug 2018, dcb314 at hotmail dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86850
>
> --- Comment #2 from David Binderman <dcb314 at hotmail dot com> ---
> Indeed it does look like vectorizer code. Here are 20 frames,
> found by using the UBSAN_OPTIONS=print_stacktrace=1 option:
OK, I suppose we're creating a SLP node for a PHI where there are zero
operands and thus no children and
SLP_TREE_CHILDREN (node).create (nops);
will not create a vector but a splice of an empty vector will barf
when splicing into it.
Index: gcc/tree-vect-slp.c
===================================================================
--- gcc/tree-vect-slp.c (revision 263656)
+++ gcc/tree-vect-slp.c (working copy)
@@ -1489,7 +1489,9 @@ fail:
node = vect_create_new_slp_node (stmts);
SLP_TREE_TWO_OPERATORS (node) = two_operators;
- SLP_TREE_CHILDREN (node).splice (children);
+ gcc_assert (children.length () == nops);
+ if (!children.is_empty ())
+ SLP_TREE_CHILDREN (node).splice (children);
return node;
}
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Subject: =?UTF-8?B?W0J1ZyBjKysvODY5OTddIGVycm9yOiBjYWxsIG9mIG92ZXJsb2FkZWQg4oCY?= =?UTF-8?B?Tm9EZXN0cnVjdG9yKDxicmFjZS1lbmNsb3NlZCBpbml0aWFsaXplciBsaXN0?= =?UTF-8?B?PinigJkgaXMgYW1iaWd1b3Vz?Date: Tue, 21 Aug 2018 11:26:00 -0000
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> Looks like a dup of PR 59389
Any easy workaround for it?
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Don't write weird code?
Either of these works fine and is obvious what it is supposed to do:
NoDestructor b;
NoDestructor b{};
The original is weird. Is it trying to construct an 'a' object and pass that to
the NoDestructor? Or just default construct the NoDestructor object?
>From gcc-bugs-return-613250-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 11:40:50 2018
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Subject: [Bug c++/86908] static_cast<BaseTypeWithVirtualMethod*>(&derivedClassObject)->virtualMehod() calls base version of virtualMethod()
Date: Tue, 21 Aug 2018 11:40:00 -0000
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--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #6)
> (In reply to Jonathan Wakely from comment #1)
> > No, your program has undefined behaviour. To make it valid you either need
> > to use std::launder, or use the pointer that is returned by the placement
> > new.
> >
> > The compiler is allowed to assume that the dynamic type of &strategy does
> > not change (that's why you need to use std::launder).
>
> You need to use std::launder at every use of the object, right?
Or just launder the pointer once and then use that:
auto laundered = std::launder(&strategy);
laundered->doIt(); //
> I wonder
> why static_cast<BaseStrategy*>() isn't a good enough "hint" here that
> the type of strategy changed (from QOI perspective, std::launder is new).
Casting from type X* to Y* where X and Y happen to be the same type can happen
in generic code that was already written years ago, and doesn't play these sort
of dirty tricks. It would be a shame to prevent useful optimisations because of
a no-op cast.
We don't need to make it easier to play nasty games with the type system. There
are ways to do this sanely, without undefined behaviour, even without
std::launder (just using the pointer returned by the placement new-expression
should be good enough, instead of accessing through &strategy every time).
> I guess a better testcase would be to declare strategy as AStrategy
> and placement-new BaseStrategy over it or does the standard guaranteee
> that AStrategy fits in the storage of BaseStrategy?
For these types, with the Itanium ABI, it fits, and you could add a
static_assert to verify it.
Either way you need to placement new the original type back again, otherwise
the wrong destructor gets called on scope exit, which adds more undefined
behaviour.
>From gcc-bugs-return-613251-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 11:47:38 2018
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Subject: [Bug middle-end/86909] Missing common subexpression elimination for types other than int
Date: Tue, 21 Aug 2018 11:47:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Similar "bad" code for using 'unsigned int'. With 'int' the reassoc
pass combines the repetitive checks to
<bb 3> [local count: 840525100]:
_8 = (unsigned int) _9;
_15 = _8 <= 7;
if (_15 != 0)
goto <bb 4>; [50.00%]
else
goto <bb 5>; [50.00%]
<bb 4> [local count: 532808861]:
iftmp.1_6 = &in_3(D)->a;
<bb 5> [local count: 1073741824]:
# _1 = PHI <iftmp.1_6(4), 0B(2), 0B(3)>
return _1;
with char or unsigned int it fails to do that which is because we are
testing different vars:
<bb 3> [local count: 840525100]:
i_36 = (int) _9;
if (i_36 == 0)
goto <bb 4>; [50.00%]
else
goto <bb 6>; [50.00%]
<bb 4> [local count: 420262550]:
if (_9 == 0)
goto <bb 5>; [71.00%]
else
goto <bb 19>; [29.00%]
<bb 5> [local count: 532808861]:
iftmp.1_6 = &in_3(D)->a;
goto <bb 19>; [100.00%]
<bb 6> [local count: 303654184]:
if (i_36 == 1)
goto <bb 7>; [67.33%]
else
goto <bb 8>; [32.67%]
<bb 7> [local count: 182536110]:
if (_9 == 1)
goto <bb 5>; [43.66%]
else
goto <bb 19>; [56.34%]
same for char. We're somehow not seeing the equivalence
_9 = MEM[(unsigned int *)in_3(D) + 4B];
i_36 = (int) _9;
when we know either is of a specific value. Jump threading and/or CSE
should do this job. Btw, the initial code is quite convoluted and needs
lot of threading to get to the above "nice" state. EVRP figures out
the equivalencies but is confused by the initial
<bb 2> :
_24 = MEM[(unsigned int *)in_5(D) + 4B];
if (_24 != 4294967295)
goto <bb 3>; [78.28%]
else
goto <bb 4>; [21.72%]
<bb 3> :
iftmp.0_20 = (long long unsigned int) _24;
<bb 4> :
# iftmp.0_18 = PHI <18446744073709551615(2), iftmp.0_20(3)>
i_7 = (int) iftmp.0_18;
which has to be jump-threaded away first with later
<bb 35> :
if (_24 != 4294967295)
goto <bb 36>; [78.28%]
else
goto <bb 38>; [21.72%]
<bb 36> :
if (_24 == 6)
goto <bb 37>; [55.78%]
else
goto <bb 38>; [44.22%]
<bb 37> :
or alternatively the initial sequence needs to be phi-opted earlier.
In the end it appears to be a pass-ordering issue.
>From gcc-bugs-return-613252-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 12:01:46 2018
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Subject: [Bug c/63303] Pointer subtraction is broken when using -fsanitize=undefined
Date: Tue, 21 Aug 2018 12:01:00 -0000
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Joshua Green <jvg1981 at aim dot com> changed:
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----------------------------------------------------------------------------
CC| |jvg1981 at aim dot com
--- Comment #17 from Joshua Green <jvg1981 at aim dot com> ---
"But if we don't know which pointer is greater, it gets more complicated: ..."
I'm not sure that this is true. For types that are larger than 1 byte, it
seems that one can do the subtraction after any division(s), hence only costing
an additional division (or shift):
T * p;
T * q;
.
.
.
intptr_t pVal = ((uintptr_t) p)/(sizeof *p);
intptr_t qVal = ((uintptr_t) q)/(sizeof *q);
ptrdiff_t p_q = pVal - qVal;
This should work in well-defined cases, for if p and q are pointers into the
same array then (presumably) ((uintptr_t) p) and ((uintptr_t) q) must have the
same remainder modulo sizeof(T).
Of course, even an additional shift may be too expensive in some cases, so it's
not entirely clear that this change should be made.
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Subject: [Bug tree-optimization/86914] [8/9 Regression] -O2 generates wrong code with strlen() of pointers within one-element arrays of structures
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug c/63303] Pointer subtraction is broken when using -fsanitize=undefined
Date: Tue, 21 Aug 2018 12:07:00 -0000
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--- Comment #18 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Tue, 21 Aug 2018, jvg1981 at aim dot com wrote:
> intptr_t pVal = ((uintptr_t) p)/(sizeof *p);
> intptr_t qVal = ((uintptr_t) q)/(sizeof *q);
Note that this can be expanded like an exact division (right shift and
multiply by reciprocal). See bug 67999 comment 24 and bug 81801 comment 4.
>From gcc-bugs-return-613255-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 12:17:05 2018
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Subject: [Bug c++/86917] [6/7/8/9 Regression] ICE in verify_ctor_sanity, at cp/constexpr.c:2798
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Subject: [Bug c/63303] Pointer subtraction is broken when using -fsanitize=undefined
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--- Comment #19 from Marc Glisse <glisse at gcc dot gnu.org> ---
This seems fixed in gcc-8, no?
>From gcc-bugs-return-613257-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 12:41:49 2018
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Subject: [Bug c++/86908] static_cast<BaseTypeWithVirtualMethod*>(&derivedClassObject)->virtualMehod() calls base version of virtualMethod()
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--- Comment #8 from Kostya Frumkin <fro0m.spam at gmail dot com> ---
> Either way you need to placement new the original type back again, otherwise
> the wrong destructor gets called on scope exit, which adds more undefined
> behaviour.
There should not be undefined behavior because the size of both classes is same
and destructors executes same code (in the case it is noop).
So the memory to be freed up is same.
The behavior must be defined by ISO committee because it is counterintuitive
when the base methods are being called. (where to ask?)
At the same time this design pattern (strategy) with placement-new is more
efficient than with common new. So it has no rationale if the base methods are
used when using placement-new. At the same time other compilers generates code
where the derived method is callsed after placement-new.
So I see two ways:
- Ask the community to define behavior.
or
- Define behavior in gcc itself.
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Subject: [Bug tree-optimization/86919] strlen of a multidimensional array element with non-constant offset not folded
Date: Tue, 21 Aug 2018 13:02:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. But you'll have a hard time here since in
_6 = (sizetype) j_3(D);
_1 = &b + _6;
_2 = __builtin_strlen (_1);
the fact that you access a different dimension is lost. Consider
const char b[][3] = { "123", "2" };
where the "123" string overflows into the next dimension when you
ask for strlen (b).
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Subject: [Bug c++/86922] Invoking templated PTMF on subclass gives false strict-aliasing warning
Date: Tue, 21 Aug 2018 13:11:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
It warns about dereferencing
(int (*) () * *) &((const struct B *) obj)->D.2305
which is built via
#2 0x0000000000b585af in cp_build_indirect_ref_1 (
ptr=<nop_expr 0x7ffff6a06220>, errorstring=RO_NULL, complain=3,
do_fold=true) at /tmp/trunk/gcc/cp/typeck.c:3155
#3 0x0000000000b58938 in cp_build_fold_indirect_ref (
pointer=<nop_expr 0x7ffff6a06220>) at /tmp/trunk/gcc/cp/typeck.c:3232
#4 0x0000000000b59a5e in get_member_function_from_ptrfunc (
instance_ptrptr=0x7fffffffc868, function=<ptrmem_cst 0x7ffff69f0600>,
complain=3) at /tmp/trunk/gcc/cp/typeck.c:3565
#5 0x000000000097aabd in build_offset_ref_call_from_tree (
fn=<ptrmem_cst 0x7ffff69f0600>, args=0x7fffffffc958, complain=3)
at /tmp/trunk/gcc/cp/decl2.c:5095
#6 0x0000000000ab9d26 in tsubst_copy_and_build (t=<call_expr 0x7ffff69f61b0>,
args=<tree_vec 0x7ffff69f07a0>, complain=3,
in_decl=<template_decl 0x7ffff68b6580 operator()>, function_p=false,
integral_constant_expression_p=false) at /tmp/trunk/gcc/cp/pt.c:18485
the fnptr type has an alias-set that isn't compatible with that of struct B.
Not sure where that int return type comes from ...
Fishy. And possibly wrong-code afterwards because of that alias set.
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Subject: [Bug tree-optimization/86924] tree-slp-vectorize may create unaligned memory access, causing segmentation fault
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
The question is where rcx comes from and why it isn't suitably aligned. This
is very likely an issue in chromium, not gcc. The workaround patch shows the
things to look at, namely the type declarations of *cpi and ordered_bwd and
where they are allocated.
Please attach preprocessed source for encoder.c as you use it when compiling
for x86_64-w64-mingw32 (just add -save-temps to the compile that reproduces the
failure).
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Subject: [Bug c++/86926] [8/9 Regression] ICE for a recursive generic lambda
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Subject: [Bug c++/86932] [8/9 Regression] Empty non-type template parameter pack not considered for SFINAE.
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Subject: [Bug c++/86908] static_cast<BaseTypeWithVirtualMethod*>(&derivedClassObject)->virtualMehod() calls base version of virtualMethod()
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--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Kostya Frumkin from comment #8)
> At the same time this design pattern (strategy) with placement-new is more
> efficient than with common new.
That's fine, but you can't use &strategy to access the AStrategy object you
created at that position. You have several choices:
- use an untyped buffer and create objects in there:
alignas(AStrategy) unsigned char buf[sizeof(AStrategy)];
- use std::launder
- use the pointer returned by the placement new-expression, which has the right
type
There are ways to do this safely in C++ today, but your original code is not
one of those ways. You should fix your code.
> So it has no rationale if the base methods
> are used when using placement-new. At the same time other compilers
> generates code where the derived method is callsed after placement-new.
It's undefined behaviour, so anything can happen.
>From gcc-bugs-return-613264-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 13:24:57 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87042] New: UBSAN: poly-int.h:1095:5: runtime error: signed integer overflow: 9223372036854775807 * 8 cannot be represented in type 'long int'
Date: Tue, 21 Aug 2018 13:24:00 -0000
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Bug ID: 87042
Summary: UBSAN: poly-int.h:1095:5: runtime error: signed
integer overflow: 9223372036854775807 * 8 cannot be
represented in type 'long int'
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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Maybe a dup of PR85164, but:
$ cat strlen.i
const char a[] = {};
b() { '\0' == a[9223372036854775807]; }
$ UBSAN_OPTIONS=print_stacktrace=1 ./xgcc -B. strlen.i -O1
strlen.i:2:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
2 | b() { '\0' == a[9223372036854775807]; }
| ^
../../gcc/poly-int.h:1095:5: runtime error: signed integer overflow:
9223372036854775807 * 8 cannot be represented in type 'long int'
#0 0xb98b74 in poly_int<1u, poly_result<long, if_nonpoly<int, int,
poly_int_traits<int>::is_poly>::type, poly_coeff_pair_traits<long,
if_nonpoly<int, int, poly_int_traits<int>::is_poly>::type>::result_kind>::type>
operator*<1u, long, int>(poly_int_pod<1u, long> const&, int const&)
../../gcc/poly-int.h:1095
#1 0x23cc1c9 in fully_constant_vn_reference_p(vn_reference_s*)
../../gcc/tree-ssa-sccvn.c:1373
#2 0x23d61f7 in vn_reference_lookup(tree_node*, tree_node*, vn_lookup_kind,
vn_reference_s**, bool) ../../gcc/tree-ssa-sccvn.c:2540
#3 0x23e1b38 in visit_reference_op_load ../../gcc/tree-ssa-sccvn.c:3798
#4 0x23e34a3 in visit_use ../../gcc/tree-ssa-sccvn.c:4163
#5 0x23e43e2 in process_scc ../../gcc/tree-ssa-sccvn.c:4346
#6 0x23e5812 in extract_and_process_scc_for_name
../../gcc/tree-ssa-sccvn.c:4467
#7 0x23e5bc4 in DFS ../../gcc/tree-ssa-sccvn.c:4517
#8 0x23ea154 in sccvn_dom_walker::before_dom_children(basic_block_def*)
../../gcc/tree-ssa-sccvn.c:4956
#9 0x3ada486 in dom_walker::walk(basic_block_def*) ../../gcc/domwalk.c:353
#10 0x23ead4e in run_scc_vn(vn_lookup_kind) ../../gcc/tree-ssa-sccvn.c:5063
#11 0x23f2aa0 in execute ../../gcc/tree-ssa-sccvn.c:6044
#12 0x1a2a1fc in execute_one_pass(opt_pass*) ../../gcc/passes.c:2446
#13 0x1a2ab8d in execute_pass_list_1 ../../gcc/passes.c:2535
#14 0x1a2ac42 in execute_pass_list_1 ../../gcc/passes.c:2536
#15 0x1a2ace1 in execute_pass_list(function*, opt_pass*)
../../gcc/passes.c:2546
#16 0x1a251da in do_per_function_toporder(void (*)(function*, void*),
void*) ../../gcc/passes.c:1688
#17 0x1a2d2b4 in execute_ipa_pass_list(opt_pass*) ../../gcc/passes.c:2894
#18 0xdb3593 in ipa_passes ../../gcc/cgraphunit.c:2407
#19 0xdb434b in symbol_table::compile() ../../gcc/cgraphunit.c:2543
#20 0xdb522e in symbol_table::finalize_compilation_unit()
../../gcc/cgraphunit.c:2788
#21 0x1e2d777 in compile_file ../../gcc/toplev.c:480
#22 0x1e349df in do_compile ../../gcc/toplev.c:2170
#23 0x1e3500d in toplev::main(int, char**) ../../gcc/toplev.c:2305
#24 0x3f49d8a in main ../../gcc/main.c:39
#25 0x7ffff5ca3fea in __libc_start_main ../csu/libc-start.c:308
#26 0x84a529 in _start
(/home/marxin/Programming/gcc2/objdir/gcc/cc1+0x84a529)
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63426
[Bug 63426] [meta-bug] Issues found with -fsanitize=undefined
>From gcc-bugs-return-613265-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 13:25:06 2018
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Subject: [Bug tree-optimization/86936] strnlen() of a constant not folded due to laddress transformation
Date: Tue, 21 Aug 2018 13:25:00 -0000
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note to GIMPLE &a[1][i_3(D)] is just address-computation and carries no
semantics so you can't assume that i_3(D) isn't negative and thus ends up
accessing "123". For the C testcase you of course can, but once we're
in GIMPLE you cannot.
If there's a load like
_7 = a[1][i_3(D)];
you _can_ assume that i_3(D) fits in the respective array types domain.
>From gcc-bugs-return-613266-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 13:28:43 2018
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Subject: [Bug c++/86943] [8/9 Regression] Wrong code when converting stateless generic lambda to function pointer
Date: Tue, 21 Aug 2018 13:28:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-613267-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 14:06:13 2018
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From: "pvitt at posteo dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/87043] New: maybe-uninitialized warning for initialized variable
Date: Tue, 21 Aug 2018 14:06:00 -0000
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Bug ID: 87043
Summary: maybe-uninitialized warning for initialized variable
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
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We have a MWE that provokes a "may be uninitialized" warning despite the value
being initialized in all cases. Additionally, this warning is only created with
-O[1,2,3,s,fast}, but not with -O{g}. The gcc is from Arch Linux.
$ gfortran -v -save-temps -O3 -Wmaybe-uninitialized uninitialized.f90
Driving: gfortran -v -save-temps -O3 -Wmaybe-uninitialized uninitialized.f90 -l
gfortran -l m -shared-libgcc
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --enable-multilib --disable-werror
--enable-checking=release --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 8.1.1 20180531 (GCC)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-Wmaybe-uninitialized'
'-shared-libgcc' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.1/f951 uninitialized.f90 -quiet -dumpbase
uninitialized.f90 -mtune=generic -march=x86-64 -auxbase uninitialized -O3
-Wmaybe-uninitialized -version -fintrinsic-modules-path
/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.1/finclude -o uninitialized.s
GNU Fortran (GCC) version 8.1.1 20180531 (x86_64-pc-linux-gnu)
compiled by GNU C version 8.1.1 20180531, GMP version 6.1.2, MPFR
version 4.0.1, MPC version 1.1.0, isl version isl-0.19-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU Fortran2008 (GCC) version 8.1.1 20180531 (x86_64-pc-linux-gnu)
compiled by GNU C version 8.1.1 20180531, GMP version 6.1.2, MPFR
version 4.0.1, MPC version 1.1.0, isl version isl-0.19-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
uninitialized.f90:20:0:
max_err_len = maxval(len_trim(error_messages))
Warning: ‘error_messages.dim[0].ubound’ may be used uninitialized in this
function [-Wmaybe-uninitialized]
[stripped assembler output...]
$ cat uninitialized.f90
module m
implicit none
integer, parameter :: error_buflen = 80
integer :: world_rank, world_size
contains
subroutine test()
character(len=error_buflen), allocatable :: error_messages(:)
integer :: allocstat, max_err_len
max_err_len = 0
if (world_rank == 0 ) then
allocate(error_messages(world_size), stat=allocstat)
else
allocate(error_messages(0))
end if
if (world_rank == 0) then
max_err_len = maxval(len_trim(error_messages))
end if
if (max_err_len > error_buflen-10) then
write(*,'(a)') 'Note...'
end if
end subroutine test
end module
program uninitialized
use m
implicit none
read(*,*) world_rank
world_size = 2
call test()
end program
>From gcc-bugs-return-613268-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 14:20:40 2018
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Subject: [Bug fortran/86945] [8/9 Regression] BUG with optimisation of select case statement in gfortran
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Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. Likely caused by CFG cleanup convert_single_case_switch which
generates a range test which is done in a signed type:
<bb 2> :
id.8_1 = CHAIN.11->id;
_3 = id.8_1 - -2147483648;
_4 = (unsigned int) _3;
if (_4 <= 2147483647)
when forwprop then combines this we fold (unsigned int) _3 <= 2147483647 to
_3 >= 2147483647 which then is folded as id.8_1 - -2147483648 >= 2147483647
which is then folded to id.8_1 >= 2147483647 + -2147483648. But something
goes wrong end we end up simplifying it as true.
>From gcc-bugs-return-613269-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 14:37:00 2018
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Subject: [Bug fortran/86945] [8/9 Regression] BUG with optimisation of select case statement in gfortran
Date: Tue, 21 Aug 2018 14:37:00 -0000
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--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
With -fsanitize=undefined we get even at -O0
id= 1
<unknown>: runtime error: signed integer overflow: 1 - -2147483647 cannot be
represented in type 'integer(kind=4)'
ierr1, OK = 0 T
<unknown>: runtime error: signed integer overflow: 1 - -2147483648 cannot be
represented in type 'integer(kind=4)'
ierr2, OK = 0 T
so both foo1 and foo2 do not "work".
>From gcc-bugs-return-613270-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 14:40:17 2018
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Subject: [Bug tree-optimization/86924] tree-slp-vectorize may create unaligned memory access, causing segmentation fault
Date: Tue, 21 Aug 2018 14:40:00 -0000
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--- Comment #2 from Mario Rohkrämer <contact at ligh dot de> ---
Unfortunately, I do not have much experience in running a compile manually. I
only let the "media-autobuild suite" batch run.
https://github.com/jb-alvarado/media-autobuild_suite/
I would not know for sure where to manipulate these batch/shell files to add
the requested argument, or how to manually run the compilation for one specific
file. It's all automated. But I will ask around and try to get advice.
>From gcc-bugs-return-613271-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 14:41:49 2018
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Subject: [Bug fortran/86945] [8/9 Regression] BUG with optimisation of select case statement in gfortran
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86945
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
C testcase:
void __attribute__((noinline,noipa))
foo(int id)
{
switch (id)
{
case (-__INT_MAX__ - 1)...-1:
__builtin_abort ();
default:;
}
}
int main()
{
foo(1);
return 0;
}
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--- Comment #3 from Mario Rohkrämer <contact at ligh dot de> ---
Created attachment 44567
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44567&action=edit
Zipped temp output encoder.i by lupo...
This is the "-save-temps" output which user lupo... attached in comment 12 to
the Chromium bug report I linked above.
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From: "barmie.brace at outlook dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/87044] New: stl_construct.h not interoperable with allocators with custom reference types
Date: Tue, 21 Aug 2018 15:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87044
Bug ID: 87044
Summary: stl_construct.h not interoperable with allocators with
custom reference types
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Created attachment 44568
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44568&action=edit
Custom allocator with custom reference object type.
STL containers don't seem to be interoperable with allocators with custom
reference types due to stl_construct.h's use of std::__addressof() instead of
the allocator's address() member.
Attached is a simple example using an allocator with a custom reference type.
[xiii@ea1c9ec7dba3 custom_allocator_test]$ make
g++ test.cpp -o test -std=gnu++14 -O3
In file included from /usr/include/c++/8.2.0/vector:62,
from test.cpp:1:
/usr/include/c++/8.2.0/bits/stl_construct.h: In instantiation of 'void
std::_Destroy(_ForwardIterator, _ForwardIterator, _Allocator&) [with
_ForwardIterator = custom_ptr<int>; _Allocator = custom_allocator<int>]':
/usr/include/c++/8.2.0/bits/stl_vector.h:567:15: required from
'std::vector<_Tp, _Alloc>::~vector() [with _Tp = int; _Alloc =
custom_allocator<int>]'
test.cpp:12:43: required from here
/usr/include/c++/8.2.0/bits/stl_construct.h:198:46: error: cannot bind
non-const lvalue reference of type 'custom_ref<int>&' to an rvalue of type
'custom_ptr<int>::reference' {aka 'custom_ref<int>'}
__traits::destroy(__alloc, std::__addressof(*__first));
^~~~~~~~
In file included from /usr/include/c++/8.2.0/bits/stl_pair.h:59,
from /usr/include/c++/8.2.0/bits/stl_algobase.h:64,
from /usr/include/c++/8.2.0/vector:60,
from test.cpp:1:
/usr/include/c++/8.2.0/bits/move.h:47:5: note: initializing argument 1 of
'constexpr _Tp* std::__addressof(_Tp&) [with _Tp = custom_ref<int>]'
__addressof(_Tp& __r) _GLIBCXX_NOEXCEPT
^~~~~~~~~~~
make: *** [Makefile:2: test] Error 1
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Subject: [Bug c++/65043] Expected narrowing conversion during list initialization of bool from double
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Aug 21 15:25:17 2018
New Revision: 263739
URL: https://gcc.gnu.org/viewcvs?rev=263739&root=gcc&view=rev
Log:
PR c++/65043
* call.c (standard_conversion): Set check_narrowing.
* typeck2.c (check_narrowing): Use CP_INTEGRAL_TYPE_P rather
than comparing with INTEGER_TYPE.
* g++.dg/concepts/pr67595.C: Add dg-warning.
* g++.dg/cpp0x/Wnarrowing11.C: New test.
* g++.dg/cpp0x/Wnarrowing12.C: New test.
* g++.dg/cpp0x/rv-cast5.C: Add static_cast.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/Wnarrowing11.C
trunk/gcc/testsuite/g++.dg/cpp0x/Wnarrowing12.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/cp/typeck2.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/concepts/pr67595.C
trunk/gcc/testsuite/g++.dg/cpp0x/rv-cast5.C
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Subject: [Bug c++/65043] Expected narrowing conversion during list initialization of bool from double
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |FIXED
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-613276-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 15:36:28 2018
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Subject: [Bug fortran/87045] New: pointer to array of character
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Bug ID: 87045
Summary: pointer to array of character
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hi all
i m getting a weird error with the following code.
many thanks
v
cat t2.f90
program test
character(:), dimension(:), allocatable, target :: t
character(:), pointer, dimension(:) :: p
allocate( character(3) :: t(2) )
t(1) = "abc"
t(2) = "123"
write(*,*) t
p => t
write(*,*) p(1)
write(*,*) p(2)
end program test
gfortran-8.1.0 t2.f90 -g -fcheck=all
./a.out
abc123
At line 8 of file t2.f90
Fortran runtime error: Unequal character lengths (-3262553545697656832/3) in
pointer assignment
Error termination. Backtrace:
#0 0x402548 in test
at /home/vwe/work/axv/pkg/build/t2.f90:8
#1 0x402724 in main
at /home/vwe/work/axv/pkg/build/t2.f90:11
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Subject: [Bug c++/86981] Add Clang's -Wpessimizing-move warning
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Aug 21 15:38:36 2018
New Revision: 263741
URL: https://gcc.gnu.org/viewcvs?rev=263741&root=gcc&view=rev
Log:
PR c++/86981, Implement -Wpessimizing-move.
* c.opt (Wpessimizing-move): New option.
* typeck.c (decl_in_std_namespace_p): New.
(is_std_move_p): New.
(maybe_warn_pessimizing_move): New.
(can_do_nrvo_p): New, factored out of ...
(check_return_expr): ... here. Warn about potentially harmful
std::move in a return statement.
* doc/invoke.texi: Document -Wpessimizing-move.
* g++.dg/cpp0x/Wpessimizing-move1.C: New test.
* g++.dg/cpp0x/Wpessimizing-move2.C: New test.
* g++.dg/cpp0x/Wpessimizing-move3.C: New test.
* g++.dg/cpp0x/Wpessimizing-move4.C: New test.
* g++.dg/cpp1z/Wpessimizing-move1.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/Wpessimizing-move1.C
trunk/gcc/testsuite/g++.dg/cpp0x/Wpessimizing-move2.C
trunk/gcc/testsuite/g++.dg/cpp0x/Wpessimizing-move3.C
trunk/gcc/testsuite/g++.dg/cpp0x/Wpessimizing-move4.C
trunk/gcc/testsuite/g++.dg/cpp1z/Wpessimizing-move1.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c.opt
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/typeck.c
trunk/gcc/doc/invoke.texi
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/86981] Add Clang's -Wpessimizing-move warning
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----------------------------------------------------------------------------
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Done for GCC 9.
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From: "yates at cscs dot ch" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/87046] New: Incorrect vectorization of fma with -O3
Date: Tue, 21 Aug 2018 15:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87046
Bug ID: 87046
Summary: Incorrect vectorization of fma with -O3
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: yates at cscs dot ch
Target Milestone: ---
Created attachment 44569
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44569&action=edit
Stripped preprocessed source of minimal test case.
In some circumstances, vectorization of fma at -O3 on broadwell and haswell
incorrectly uses the wrong data for the addition component. While the sample
code was tested with gcc version 7.3.0 with -march=haswell, the same problem
arises with gcc 6.4.0.
Disabling tree-slp-vectorize restores correct behaviour.
I've attached a stripped down preprocessed source that demonstrates the bug.
gcc -v output:
Using built-in specs.
COLLECT_GCC=/opt/gcc/7.3.0/bin/../snos/bin/gcc
COLLECT_LTO_WRAPPER=/opt/gcc/7.3.0/snos/libexec/gcc/x86_64-suse-linux/7.3.0/lto-wrapper
Target: x86_64-suse-linux
Configured with: ../cray-gcc-7.3.0-201801270210.d61239fc6000b/configure
--prefix=/opt/gcc/7.3.0/snos --disable-nls --libdir=/opt/gcc/7.3.0/snos/lib
--enable-languages=c,c++,fortran
--with-gxx-include-dir=/opt/gcc/7.3.0/snos/include/g++
--with-slibdir=/opt/gcc/7.3.0/snos/lib --with-system-zlib --enable-shared
--enable-__cxa_atexit --build=x86_64-suse-linux --with-ppl --with-cloog
--disable-multilib
Thread model: posix
gcc version 7.3.0 20180125 (Cray Inc.) (GCC)
Compilation command line and program output:
$ gcc -O3 -march=haswell fma-reduced-bug.i
$ ./a.out
Aborted (core dumped)
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Subject: [Bug tree-optimization/87046] Incorrect vectorization of fma with -O3
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
Component|target |tree-optimization
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
This appears recently fixed, gcc-8.1 still got this wrong but gcc-8.2 is ok.
Possibly went away with PR 85597 fix, but not sure about that.
On gcc-8.1 SLP incorrectly produced
vectp.1_29 = u_4(D);
vect__26.2_27 = MEM[(const double *)vectp.1_29];
_65 = MEM[(const double *)u_4(D) + 24B];
vectp.4_22 = v_7(D);
vect__28.5_17 = MEM[(const double *)vectp.4_22];
_67 = MEM[(const double *)v_7(D) + 24B];
vectp.7_64 = w_10(D);
vect__30.8_66 = MEM[(const double *)vectp.7_64];
_69 = MEM[(const double *)w_10(D) + 24B];
_68 = {_26, _39, _52, _65};
vect_cst__15 = _68;
vect__31.9_25 = vect__26.2_27 * vect__28.5_17 + vect_cst__15;
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Subject: [Bug libstdc++/87044] stl_construct.h not interoperable with allocators with custom reference types
Date: Tue, 21 Aug 2018 16:16:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is correct: custom reference types are not supported at all, and never
will be. And that's not a bug. The container requirements in the standard
require X::reference to be X::value_type&, and the allocator requirements do
not have any reference/const_reference member types at all.
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Subject: [Bug target/87014] [x32] __builtin_eh_return should use 64-bit mov to set return address
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--- Comment #8 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Tue Aug 21 16:17:35 2018
New Revision: 263743
URL: https://gcc.gnu.org/viewcvs?rev=263743&root=gcc&view=rev
Log:
x86: Always update EH return address in word_mode
On x86, return address is always popped in word_mode. eh_return needs
to put EH return address in word_mode on stack.
gcc/
Backport from mainline
PR target/87014
* config/i386/i386.md (eh_return): Always update EH return
address in word_mode.
gcc/testsuite/
Backport from mainline
PR target/87014
* g++.dg/torture/pr87014.C: New file.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/torture/pr87014.C
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/config/i386/i386.md
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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Subject: [Bug libstdc++/87044] stl_construct.h not interoperable with allocators with custom reference types
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The address() member was removed from the allocator requirements for C++11, so
it's wrong to expect it to be used.
https://en.cppreference.com/w/cpp/named_req/Allocator#Requirements
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Subject: [Bug libstdc++/87044] stl_construct.h not interoperable with allocators with custom reference types
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
See also https://cplusplus.github.io/LWG/lwg-closed.html#1318 which requested
that custom references be put back, and was closed as Not A Defect.
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Subject: [Bug target/87014] [x32] __builtin_eh_return should use 64-bit mov to set return address
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--- Comment #9 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Tue Aug 21 16:27:22 2018
New Revision: 263744
URL: https://gcc.gnu.org/viewcvs?rev=263744&root=gcc&view=rev
Log:
x86: Always update EH return address in word_mode
On x86, return address is always popped in word_mode. eh_return needs
to put EH return address in word_mode on stack.
gcc/
Backport from mainline
PR target/87014
* config/i386/i386.md (eh_return): Always update EH return
address in word_mode.
gcc/testsuite/
Backport from mainline
PR target/87014
* g++.dg/torture/pr87014.C: New file.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/torture/pr87014.C
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/i386/i386.md
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug target/87014] [x32] __builtin_eh_return should use 64-bit mov to set return address
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--- Comment #10 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Tue Aug 21 16:38:17 2018
New Revision: 263745
URL: https://gcc.gnu.org/viewcvs?rev=263745&root=gcc&view=rev
Log:
x86: Always update EH return address in word_mode
On x86, return address is always popped in word_mode. eh_return needs
to put EH return address in word_mode on stack.
gcc/
Backport from mainline
PR target/87014
* config/i386/i386.md (eh_return): Always update EH return
address in word_mode.
gcc/testsuite/
Backport from mainline
PR target/87014
* g++.dg/torture/pr87014.C: New file.
Added:
branches/gcc-6-branch/gcc/testsuite/g++.dg/torture/pr87014.C
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/config/i386/i386.md
branches/gcc-6-branch/gcc/testsuite/ChangeLog
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87014] [x32] __builtin_eh_return should use 64-bit mov to set return address
Date: Tue, 21 Aug 2018 16:39:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Version|unknown |9.0
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #11 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 9 and on GCC 6/7/8 branches.
>From gcc-bugs-return-613288-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 18:32:00 2018
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From: "already5chosen at yahoo dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/87047] New: gcc 7 & 8 - performance regression because of if-conversion
Date: Tue, 21 Aug 2018 18:31:00 -0000
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Bug ID: 87047
Summary: gcc 7 & 8 - performance regression because of
if-conversion
Product: gcc
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Created attachment 44570
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44570&action=edit
demonstrate performance regression because of if-conversion
Very significant performance regression from gcc 6.x to 7.x and 8.x cause by
if-conversion of predictable branch.
Compilation flags: -O2 -Wall
Target: x86-64 (my test machine is IvyBridge)
It is possible that the problem is specific to x86-64 target. I tested (by
observing compiler output) aarch64 target and it looks o.k.
The problem occurs here:
if ((i & 15)==0) {
const uint64_t PROD_ONE = (uint64_t)(1) << 19;
uint64_t prod = umulh(invRange, range);
invRange = umulh(invRange, (PROD_ONE*2-1-prod)<<44)<<1;
}
The condition has low probability and is easily predicted by branch predictor,
while code within if has relatively high latency.
gcc, starting from gcc.7.x and up to the latest, is convinced that always
executing the inner part of the if is a bright idea. Measurements, on my
real-world code, do not agree and show 30% slowdown. I'm sure that on
artificial sequences I can demonstrate a slowdown of 100% and more.
What is special about this case is that compiler is VERY confident in its
stupid decision. It does not change its mind even when I replace
if ((i & 15)==0) {
by
if (__builtin_expect((i & 15)==0, 0)) {
I found only two ways of forcing sane code generation:
1. -fno-if-conversion
2.
if ((i & 15)==0) {
asm volatile("");
...
}
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86499] lambda-expressions with capture-default are allowed at namespace scope
Date: Tue, 21 Aug 2018 18:37:00 -0000
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Aug 21 18:37:23 2018
New Revision: 263749
URL: https://gcc.gnu.org/viewcvs?rev=263749&root=gcc&view=rev
Log:
PR c++/86499
* parser.c (cp_parser_lambda_introducer): Give error if a non-local
lambda has a capture-default.
* g++.dg/cpp0x/lambda/lambda-non-local.C: New test.
* g++.dg/cpp0x/lambda/lambda-this10.C: Adjust dg-error.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-non-local.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-this10.C
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Subject: [Bug c++/86499] lambda-expressions with capture-default are allowed at namespace scope
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-613291-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 18:49:46 2018
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Subject: [Bug fortran/25829] [F03] Asynchronous IO support
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--- Comment #55 from Nicolas Koenig <koenigni at gcc dot gnu.org> ---
Author: koenigni
Date: Tue Aug 21 18:48:59 2018
New Revision: 263750
URL: https://gcc.gnu.org/viewcvs?rev=263750&root=gcc&view=rev
Log:
2018-08-21 Nicolas Koenig <koenigni@gcc.gnu.org>
Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/25829
* gfortran.texi: Add description of asynchronous I/O.
* trans-decl.c (gfc_finish_var_decl): Treat asynchronous variables
as volatile.
* trans-io.c (gfc_build_io_library_fndecls): Rename st_wait to
st_wait_async and change argument spec from ".X" to ".w".
(gfc_trans_wait): Pass ID argument via reference.
2018-08-21 Nicolas Koenig <koenigni@gcc.gnu.org>
Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/25829
* gfortran.dg/f2003_inquire_1.f03: Add write statement.
* gfortran.dg/f2003_io_1.f03: Add wait statement.
2018-08-21 Nicolas Koenig <koenigni@gcc.gnu.org>
Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/25829
* Makefile.am: Add async.c to gfor_io_src.
Add async.h to gfor_io_headers.
* Makefile.in: Regenerated.
* gfortran.map: Add _gfortran_st_wait_async.
* io/async.c: New file.
* io/async.h: New file.
* io/close.c: Include async.h.
(st_close): Call async_wait for an asynchronous unit.
* io/file_pos.c (st_backspace): Likewise.
(st_endfile): Likewise.
(st_rewind): Likewise.
(st_flush): Likewise.
* io/inquire.c: Add handling for asynchronous PENDING
and ID arguments.
* io/io.h (st_parameter_dt): Add async bit.
(st_parameter_wait): Correct.
(gfc_unit): Add au pointer.
(st_wait_async): Add prototype.
(transfer_array_inner): Likewise.
(st_write_done_worker): Likewise.
* io/open.c: Include async.h.
(new_unit): Initialize asynchronous unit.
* io/transfer.c (async_opt): New struct.
(wrap_scalar_transfer): New function.
(transfer_integer): Call wrap_scalar_transfer to do the work.
(transfer_real): Likewise.
(transfer_real_write): Likewise.
(transfer_character): Likewise.
(transfer_character_wide): Likewise.
(transfer_complex): Likewise.
(transfer_array_inner): New function.
(transfer_array): Call transfer_array_inner.
(transfer_derived): Call wrap_scalar_transfer.
(data_transfer_init): Check for asynchronous I/O.
Perform a wait operation on any pending asynchronous I/O
if the data transfer is synchronous. Copy PDT and enqueue
thread for data transfer.
(st_read_done_worker): New function.
(st_read_done): Enqueue transfer or call st_read_done_worker.
(st_write_done_worker): New function.
(st_write_done): Enqueue transfer or call st_read_done_worker.
(st_wait): Document as no-op for compatibility reasons.
(st_wait_async): New function.
* io/unit.c (insert_unit): Use macros LOCK, UNLOCK and TRYLOCK;
add NOTE where necessary.
(get_gfc_unit): Likewise.
(init_units): Likewise.
(close_unit_1): Likewise. Call async_close if asynchronous.
(close_unit): Use macros LOCK and UNLOCK.
(finish_last_advance_record): Likewise.
(newunit_alloc): Likewise.
* io/unix.c (find_file): Likewise.
(flush_all_units_1): Likewise.
(flush_all_units): Likewise.
* libgfortran.h (generate_error_common): Add prototype.
* runtime/error.c: Include io.h and async.h.
(generate_error_common): New function.
2018-08-21 Nicolas Koenig <koenigni@gcc.gnu.org>
Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/25829
* testsuite/libgomp.fortran/async_io_1.f90: New test.
* testsuite/libgomp.fortran/async_io_2.f90: New test.
* testsuite/libgomp.fortran/async_io_3.f90: New test.
* testsuite/libgomp.fortran/async_io_4.f90: New test.
* testsuite/libgomp.fortran/async_io_5.f90: New test.
* testsuite/libgomp.fortran/async_io_6.f90: New test.
* testsuite/libgomp.fortran/async_io_7.f90: New test.
Added:
trunk/libgfortran/io/async.c
trunk/libgfortran/io/async.h
trunk/libgomp/testsuite/libgomp.fortran/async_io_1.f90
trunk/libgomp/testsuite/libgomp.fortran/async_io_2.f90
trunk/libgomp/testsuite/libgomp.fortran/async_io_3.f90
trunk/libgomp/testsuite/libgomp.fortran/async_io_4.f90
trunk/libgomp/testsuite/libgomp.fortran/async_io_5.f90
trunk/libgomp/testsuite/libgomp.fortran/async_io_6.f90
trunk/libgomp/testsuite/libgomp.fortran/async_io_7.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/gfortran.texi
trunk/gcc/fortran/trans-decl.c
trunk/gcc/fortran/trans-io.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/f2003_inquire_1.f03
trunk/gcc/testsuite/gfortran.dg/f2003_io_1.f03
trunk/libgfortran/ChangeLog
trunk/libgfortran/Makefile.am
trunk/libgfortran/Makefile.in
trunk/libgfortran/gfortran.map
trunk/libgfortran/io/close.c
trunk/libgfortran/io/file_pos.c
trunk/libgfortran/io/inquire.c
trunk/libgfortran/io/io.h
trunk/libgfortran/io/open.c
trunk/libgfortran/io/read.c
trunk/libgfortran/io/transfer.c
trunk/libgfortran/io/unit.c
trunk/libgfortran/io/unix.c
trunk/libgfortran/libgfortran.h
trunk/libgfortran/runtime/error.c
trunk/libgomp/ChangeLog
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Subject: [Bug tree-optimization/87008] [8/9 Regression] gimple mem-to-mem assignment badly optimized
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--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
struct A { double a, b; };
struct B : A {};
template<class T>void cp(T&a,T const&b){a=b;}
double f(B x){
B y; cp<A>(y,x);
B z; cp<A>(z,x);
return y.a - z.a;
}
This is not quite equivalent because RTL manages to optimize this case, but
gimple, with -Ofast, still gets the ugly:
ISRA.1 = MEM[(const struct A &)&x];
SR.9_9 = MEM[(struct A *)&ISRA.1];
ISRA.1 = MEM[(const struct A &)&x];
SR.8_10 = MEM[(struct A *)&ISRA.1];
_3 = SR.9_9 - SR.8_10;
return _3;
Writing cp<B> instead of cp<A> makes it work, and the main difference starts in
SRA. I expect (didn't check) this is another victim of r255510 .
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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/87048] New: [9 Regression] array_constructor_8.f90 failure on armeb
Date: Tue, 21 Aug 2018 19:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87048
Bug ID: 87048
Summary: [9 Regression] array_constructor_8.f90 failure on
armeb
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libfortran
Assignee: unassigned at gcc dot gnu.org
Reporter: tkoenig at gcc dot gnu.org
Target Milestone: ---
Since r263082, array_constructor_8.f90 fails on armeb.
PR 25829 contains debugging info on that, see also
https://gcc.gnu.org/ml/fortran/2018-08/msg00010.html and
the following discussion.
>From gcc-bugs-return-613294-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 19:41:12 2018
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Subject: [Bug libfortran/87048] [9 Regression] array_constructor_8.f90 failure on armeb
Date: Tue, 21 Aug 2018 19:41:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |25829
Target Milestone|--- |9.0
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25829
[Bug 25829] [F03] Asynchronous IO support
>From gcc-bugs-return-613295-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 20:30:53 2018
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From: "bunk at stusta dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/87049] New: __clear_cache() prototype confusion
Date: Tue, 21 Aug 2018 20:30:00 -0000
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Bug ID: 87049
Summary: __clear_cache() prototype confusion
Product: gcc
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$ cat test.cc
extern "C" void __clear_cache(char *beg, char *end);
$ g++-5 -c test.cc
test.cc:1:51: warning: new declaration 'void __clear_cache(char*, char*)'
ambiguates built-in declaration 'void __clear_cache(void*, void*)'
extern "C" void __clear_cache(char *beg, char *end);
^
$ g++-7 -c test.cc
test.cc:1:17: warning: new declaration 'void __clear_cache(char*, char*)'
ambiguates built-in declaration 'void __clear_cache(void*, void*)'
[-Wbuiltin-declaration-mismatch]
extern "C" void __clear_cache(char *beg, char *end);
^~~~~~~~~~~~~
$ g++-8 -c test.cc
test.cc:1:17: error: new declaration 'void __clear_cache(char*, char*)'
ambiguates built-in declaration 'void __clear_cache(void*, void*)'
[-fpermissive]
extern "C" void __clear_cache(char *beg, char *end);
^~~~~~~~~~~~~
$
The bug is not that g++ became more strict, the bug is that the built-in
declaration differs from the documented declaration.
Relevant part of the gcc sources:
gcc/builtins.def:DEF_EXT_LIB_BUILTIN (BUILT_IN_CLEAR_CACHE, "__clear_cache",
BT_FN_VOID_PTR_PTR, ATTR_NOTHROW_LEAF_LIST)
gcc/doc/extend.texi:@deftypefn {Built-in Function} void __builtin___clear_cache
(char *@var{begin}, char *@var{end})
libgcc/libgcc2.h:extern void __clear_cache (char *, char *);
Doesn't seem to be a new issue:
http://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20130513/079828.html
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Subject: [Bug debug/79342] [6 Regression] ICE in output_index_string, at dwarf2out.c:25635 with -gsplit-dwarf
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H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
*** Bug 70578 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-613296-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 20:31:52 2018
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Subject: [Bug debug/70578] internal compiler error: in output_index_string, at dwarf2out.c with -gsplit-dwarf
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H.J. Lu <hjl.tools at gmail dot com> changed:
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--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
Dup.
*** This bug has been marked as a duplicate of bug 79342 ***
>From gcc-bugs-return-613298-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 20:33:54 2018
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/87008] [8/9 Regression] gimple mem-to-mem assignment badly optimized
Date: Tue, 21 Aug 2018 20:33:00 -0000
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--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
Or just:
struct A { double a, b; };
struct B : A {};
double f(B x){
B y;
A*px=&x;
A*py=&y;
*py=*px;
return y.a;
}
MEM[(struct A *)&y] = MEM[(const struct A &)&x];
y_6 = MEM[(struct A *)&y];
y ={v} {CLOBBER};
return y_6;
where y_6 should be read directly from x. SRA doesn't dare touch it. SCCVN does
see that reading from y is equivalent to reading from x, but unless something
else is already reading from x, it keeps the read from y.
>From gcc-bugs-return-613299-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 20:40:57 2018
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From: "jb at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug web/87050] New: Bump wwwdocs to html5
Date: Tue, 21 Aug 2018 20:40:00 -0000
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Bug ID: 87050
Summary: Bump wwwdocs to html5
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Currently the GCC website is "XHTML 1.0 Transitional". This specification has
been superseded in favor of the latest HTML version, currently 5.2 (see
https://www.w3.org/TR/xhtml1/ ). Reasons to update
- Easier to hand-edit, e.g. in many cases no need for closing tags, and in
general more forgiving parsing.
- XHTML, and in particular XHTML delivered as text/html, is a technological
dead end. People will only get less and less familiar with it.
For a relatively simple set of pages like the GCC wwwdocs that doesn't use any
particularly exotic features, HTML5 is more or less completely backwards
compatible with XHTML 1.0 (for details, see https://www.w3.org/TR/html5-diff/
). So apart from the headers, little work ought to be needed for the conversion
itself.
>From gcc-bugs-return-613300-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 20:47:13 2018
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Subject: [Bug target/87040] ICE in extract_constrain_insn_cached, at recog.c:2218
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|ppc64le-linux-gnu |powerpc*-*-*
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-21
Host|x86_64-linux-gnu |
Assignee|unassigned at gcc dot gnu.org |segher at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This is a dup of some other PR I already have a patch for.
>From gcc-bugs-return-613301-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 21:16:10 2018
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Subject: [Bug target/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
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--- Comment #20 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Wilco from comment #19)
> Well insn_cost() uses COSTS_N_INSNS (1) for instructions with unknown (zero)
> costs. That's a reasonable default and gives more accurate cost comparisons,
> eg. 0 + 4 vs 0 + 8 now becomes 4 + 4 vs 4 + 8.
You're talking about the default insn_cost, which uses pattern_cost to do the
work; pattern_cost returns COSTS_N_INSNS (1) if there is a single SET (or a
single SET and a single SET of COMPARE), and set_src_cost of that SET says it
is cost 0. It does not say cost 0 for a PARALLEL of two SETs, like you have
here.
A target-specific insn_cost can return a saner cost for all insns, including
for those that are a "real" PARALLEL.
(COSTS_N_INSNS (1) isn't minimal of course, it is 4 like you already point
out; it is the default insn cost).
It never is clear that 0+4 is better than 0+8, because the 0's usually are not
the cost of the same insn.
> With those changes I think there will be far fewer cases with unknown costs.
I'm not sure what changes you propose.
> There will be cases where target insn_cost needs to be improved to more
> accurately model complex instructions, but that will result in even better
> code.
The arm port does not _have_ the insn_cost hook implemented; doing that will
probably help, sure.
>From gcc-bugs-return-613302-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 21:27:17 2018
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Subject: [Bug c/87038] diagnostics: Please add warning for jumping over initializers with switch/case in C mode
Date: Tue, 21 Aug 2018 21:27:00 -0000
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--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
This is Wjump-misses-init. Is this a request to make some other option
such as -Wall or -Wextra enable that option (rather than just -Wc++-compat
as at present)?
>From gcc-bugs-return-613303-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 21:34:17 2018
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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/87047] [7/8/9 Regression] performance regression because of if-conversion
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-21
CC| |amonakov at gcc dot gnu.org
Component|middle-end |rtl-optimization
Summary|gcc 7 & 8 - performance |[7/8/9 Regression]
|regression because of |performance regression
|if-conversion |because of if-conversion
Ever confirmed|0 |1
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Indeed, on first glance something is suspicious in RTL if-conversion, the block
is quite large and should not be transformed. Unfortunately the pass doesn't
dump estimated costs :(
>From gcc-bugs-return-613304-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 21:38:39 2018
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Subject: [Bug rtl-optimization/87047] [7/8/9 Regression] performance regression because of if-conversion
Date: Tue, 21 Aug 2018 21:38:00 -0000
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I suspect it is treating cost 0 as being free rather than unknown cost. And
the x86 backend is returning 0 cost for the upper multiple.
>From gcc-bugs-return-613305-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 22:12:30 2018
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From: "arthur.j.odwyer at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87051] New: is_trivially_move_constructible wrongly gives `false` for class with user-provided non-const copy constructor
Date: Tue, 21 Aug 2018 22:12:00 -0000
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Bug ID: 87051
Summary: is_trivially_move_constructible wrongly gives `false`
for class with user-provided non-const copy
constructor
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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cat > test.cc <<EOF
struct M {
M(M&);
M(const M&) = default;
};
static_assert( __is_trivially_constructible(M, M&&) );
EOF
g++ -std=c++17 test.cc
GCC fails the static-assert:
test.cc:5:16: error: static assertion failed
static_assert( __is_trivially_constructible(M, M&&) );
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Comparison to other compilers: https://godbolt.org/z/mbeKD5
Verification that the codegen for a move-construction correctly picks the
trivial constructor, not the non-trivial one: https://godbolt.org/z/IBkgPY
>From gcc-bugs-return-613306-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 22:29:54 2018
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Subject: [Bug c/87038] diagnostics: Please add warning for jumping over initializers with switch/case in C mode
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--- Comment #4 from Steinar H. Gunderson <steinar+gcc at gunderson dot no> ---
Oh, it exists? Yes, if so, please count this as a request for enabling on
-Wextra.
>From gcc-bugs-return-613307-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 22:36:24 2018
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Subject: [Bug web/87050] Bump wwwdocs to html5
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |gerald at gcc dot gnu.org
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Makes sense to me. CCing Gerald.
>From gcc-bugs-return-613308-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 22:39:57 2018
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Subject: [Bug c++/87051] is_trivially_move_constructible wrongly gives `false` for class with user-provided non-const copy constructor
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-21
CC| |ville at gcc dot gnu.org
Ever confirmed|0 |1
>From gcc-bugs-return-613309-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 23:19:12 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug sanitizer/82076] inconsistencies between sanitizer and -Wstringop-overflow
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--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
I think the problem in this case is that a) the sanitizers don't instrument
calls to built-in functions like memcpy (the reason for the missing runtime
error in the case of -DN=3), and b) -Wstringop-overflow doesn't handle MEM_REF
(which is what memcpy with a small power-of-2 size is transformed into). Both
should be solvable.
>From gcc-bugs-return-613310-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 23:33:19 2018
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Subject: [Bug c++/87051] is_trivially_move_constructible wrongly gives `false` for class with user-provided non-const copy constructor
Date: Tue, 21 Aug 2018 23:33:00 -0000
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Ville Voutilainen <ville.voutilainen at gmail dot com> changed:
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----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |ville.voutilainen at gmail dot com
Assignee|unassigned at gcc dot gnu.org |ville.voutilainen at gmail dot com
--- Comment #1 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
I'll take a look.
>From gcc-bugs-return-613311-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 23:57:51 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/87052] New: STRING_CST printing incomplete in Gimple dumps
Date: Tue, 21 Aug 2018 23:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87052
Bug ID: 87052
Summary: STRING_CST printing incomplete in Gimple dumps
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
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STRING_CST nodes with embedded nuls are formatted in Gimple dumps only up to
the first nul. Characters beyond the first nul are not printed. This makes
the dumps incomplete (and raises the question of whether the code is even
correct.) This has recently been exacerbated by transforming braced-list
initialized constant character arrays into STRING_CSTs (r263511).
$ cat f.c && gcc -O2 -S -Wall -fdump-tree-gimple=/dev/stdout f.c
void f (char *d)
{
const char a[3] = "\000ab";
__builtin_strcpy (d, a);
}
void g (char *d)
{
const char a[] = { 0, 'a', 'b', 'b' };
__builtin_strcpy (d, a);
}
f (char * d)
{
const char a[3];
try
{
a = "";
__builtin_strcpy (d, &a);
}
finally
{
a = {CLOBBER};
}
}
g (char * d)
{
const char a[4];
try
{
a = "";
__builtin_strcpy (d, &a);
}
finally
{
a = {CLOBBER};
}
}
>From gcc-bugs-return-613312-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 21 23:58:33 2018
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Subject: [Bug middle-end/87052] STRING_CST printing incomplete in Gimple dumps
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2018-08-21
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>From gcc-bugs-return-613314-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 00:28:57 2018
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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87026] [9 Regression] ICE in extract_constrain_insn_cached, at recog.c:2218
Date: Wed, 22 Aug 2018 00:28:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |marxin at gcc dot gnu.org
--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
*** Bug 87040 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-613313-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 00:28:57 2018
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Subject: [Bug target/87040] ICE in extract_constrain_insn_cached, at recog.c:2218
Date: Wed, 22 Aug 2018 00:28:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Dup of PR87026.
*** This bug has been marked as a duplicate of bug 87026 ***
>From gcc-bugs-return-613315-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 01:53:24 2018
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From: "qinzhao at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/86519] [9 Regression] New test case gcc.dg/strcmpopt_6.c fails with its introduction in r262636
Date: Wed, 22 Aug 2018 01:53:00 -0000
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--- Comment #19 from qinzhao at gcc dot gnu.org ---
which sparc machine was used to repeat the failure, and what's the configure
and make options?
>From gcc-bugs-return-613316-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 02:14:34 2018
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From: "jvdelisle at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/86837] Optimization breaks an unformatted read with implicit loop on Mac OS X
Date: Wed, 22 Aug 2018 02:14:00 -0000
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Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-22
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--- Comment #3 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Confirmed on current trunk.
>From gcc-bugs-return-613317-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 02:57:20 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/87052] STRING_CST printing incomplete in Gimple dumps
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |patch
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01324.html
>From gcc-bugs-return-613318-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 02:58:04 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/87034] [9 Regression] missing -Wformat-overflow on a sprintf %s with a wide string
Date: Wed, 22 Aug 2018 02:58:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-22
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01321.html
>From gcc-bugs-return-613319-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 03:16:04 2018
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Subject: [Bug middle-end/87053] New: wrong code with c_strlen
Date: Wed, 22 Aug 2018 03:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87053
Bug ID: 87053
Summary: wrong code with c_strlen
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
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$ cat u.c
const union
{ struct {
char x[4];
char y[4];
};
struct {
char z[8];
};
} u = {{"1234", "567"}};
int test()
{
return __builtin_strlen(u.z);
}
$ gcc -S u.c
$
cat u.s
.file "u.c"
.text
.globl u
.section .rodata
.align 8
.type u, @object
.size u, 8
u:
.ascii "1234"
.string "567"
.text
.globl test
.type test, @function
test:
.LFB0:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
movl $4, %eax
popq %rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE0:
.size test, .-test
.ident "GCC: (GNU) 9.0.0 20180821 (experimental)"
.section .note.GNU-stack,"",@progbits
which Looks wrong.
expected: not folded, or evaluate to 7.
>From gcc-bugs-return-613320-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 05:41:41 2018
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From: "aoliva at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87054] New: misaligned asm output is turned into dereferenced pointer-to-aligned
Date: Wed, 22 Aug 2018 05:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87054
Bug ID: 87054
Summary: misaligned asm output is turned into dereferenced
pointer-to-aligned
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: aoliva at gcc dot gnu.org
Depends on: 80334
Target Milestone: ---
This bug came up while attempting to trigger the bug 80334, that was suspected
to be latent in earlier versions. I managed to trigger the latent problem with
a variant of the testcase below, but attempting to further minimize it, I found
a way to trigger it even in GCC 8 and trunk:
#ifndef T
# define T long
#endif
#ifndef R
# define R "r"
#endif
typedef T A; // #define T to long or __int128
struct B { char d; A c; } __attribute__((packed));
B b[50]; // many elements to avoid loop unrolling
int main () {
for (int i = 0; i < sizeof(b) / sizeof(*b); i++) {
asm ("" : "+" R (b[i].unpacked)); // #define R to "r" on ppc or "x" on
x86_64
}
}
The gimplifier introduces a pointer to the misaligned field for the asm output,
discarding the information about the misalignment, and that pointer is
dereferenced as if the object was aligned. There is a (broken) patch in that
bug that works around the problem, but that fails to build libstdc++-v3
(unbound template names).
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80334#c12
FTR, the testcase that exercises the bug in older compilers, before the fix was
backported, has a "manual reload" of the asm operand, compared with the above:
auto r = b[i].unpacked; // aligned access to unaligned address
asm ("" : "+" R (r)); // #define R to "r" on ppc or "x" on x86_64
b[i].unpacked = r; // pretend the loop has externally-visible effects
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80334
[Bug 80334] [5 Regression] Segfault when taking address of copy of unaligned
struct
>From gcc-bugs-return-613321-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 05:49:01 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/80334] [5 Regression] Segfault when taking address of copy of unaligned struct
Date: Wed, 22 Aug 2018 05:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80334
--- Comment #14 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Done, bug 87054.
The patch in comment 13 fails libstdc++-v3; the language-independent
get_object_alignment can't deal with unresolved template expressions, so using
the same logic you added to ivopts to adjust the type of the
compiler-introduced pointer won't do in build_fold_addr_expr_loc.
>From gcc-bugs-return-613322-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 07:14:46 2018
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From: "jb at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug web/87050] Bump wwwdocs to html5
Date: Wed, 22 Aug 2018 07:14:00 -0000
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--- Comment #2 from Janne Blomqvist <jb at gcc dot gnu.org> ---
The validation script that runs upon committing a change and sends email likely
needs to change too. There is https://validator.github.io/validator/ that can
be run as a batch script (needs java), or one can use a publically available
hosted service (a few listed on the page above).
>From gcc-bugs-return-613323-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 07:21:19 2018
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Subject: [Bug middle-end/63155] [6/7/8/9 Regression] memory hog
Date: Wed, 22 Aug 2018 07:21:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2014-09-03 00:00:00 |2018-8-22
Known to fail| |8.2.0
--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> ---
Re-confirmed.
>From gcc-bugs-return-613324-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 07:28:01 2018
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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/87055] New: Unoptimal address calculation
Date: Wed, 22 Aug 2018 07:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87055
Bug ID: 87055
Summary: Unoptimal address calculation
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
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Following testcase:
--cut here--
int a[256];
int foo (int i)
{
return a[i+1];
}
--cut here--
compiles on x86_64 (-O2) to:
addl $1, %edi
movslq %edi, %rdi
movl a(,%rdi,4), %eax
ret
clang merges the addition with the address:
movslq %edi, %rax
movl a+4(,%rax,4), %eax
retq
Related: PR54589
>From gcc-bugs-return-613325-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 07:33:18 2018
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Subject: [Bug target/54589] struct offset add should be folded into address calculation
Date: Wed, 22 Aug 2018 07:33:00 -0000
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--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
clang generates for x86_64:
movzbl (%rsi), %eax
shlq $4, %rax
movl 16(%rdi,%rax), %eax
movl %eax, (%rdx)
retq
and for i?86:
movl 8(%esp), %edx
movl 4(%esp), %ecx
movl 12(%esp), %eax
movzbl (%edx), %edx
shll $4, %edx
movl 16(%ecx,%edx), %ecx
movl %ecx, (%eax)
retl
for the later case (-m32), gcc generates:
movl 8(%esp), %eax
movzbl (%eax), %eax
addl $1, %eax
sall $4, %eax
addl 4(%esp), %eax
movl (%eax), %edx
movl 12(%esp), %eax
movl %edx, (%eax)
ret
so, two extra additions.
>From gcc-bugs-return-613326-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 07:35:49 2018
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Subject: [Bug target/86947] Erroneous code generated with O2 and O3 for PPC
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |powerpc
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-08-22
CC| |rguenth at gcc dot gnu.org
Component|c |target
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Can you possibly provide a driver (main() function) that calls abort() when
the miscompilation occurs and exits without error if not?
>From gcc-bugs-return-613327-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 07:38:13 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86953] [6/7/8/9 Regression] compiler crashes with constexpr operator== and specific struct (cxx_eval_bit_field_ref, at cp/constexpr.c:2704)
Date: Wed, 22 Aug 2018 07:38:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Known to work| |5.4.0
Target Milestone|--- |6.5
>From gcc-bugs-return-613328-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 07:42:01 2018
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Subject: [Bug gcov-profile/86957] gcc should warn about missing profiles for a compilation unit or a new function with -fprofile-use
Date: Wed, 22 Aug 2018 07:42:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I wonder if for assessing the quality of a profile it is somehow possible to
dump
all functions that got never executed during training? Because all those
functions will be optimized as cold by GCC AFAIK.
>From gcc-bugs-return-613329-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 07:43:00 2018
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Subject: [Bug c++/86960] [8/9 Regression] internal compiler error: in coerce_template_parms
Date: Wed, 22 Aug 2018 07:43:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Priority|P3 |P2
Known to work| |7.3.0
Target Milestone|--- |8.3
Summary|[Regression] internal |[8/9 Regression] internal
|compiler error: in |compiler error: in
|coerce_template_parms |coerce_template_parms
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Subject: [Bug fortran/86837] [8/9 Regression] Optimization breaks an unformatted read with implicit loop
Date: Wed, 22 Aug 2018 07:44:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Target Milestone|--- |8.3
Summary|Optimization breaks an |[8/9 Regression]
|unformatted read with |Optimization breaks an
|implicit loop on Mac OS X |unformatted read with
| |implicit loop
Build|x86_64-darwin |
--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The change occurred between revisions r248853 (2017-06-03, OK) and r249632
(2017-06-25, wrong code), r249092 (pr80988) or r248877 (pr35339)?
>From gcc-bugs-return-613331-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 07:55:58 2018
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Subject: [Bug debug/86964] Too many debug symbols included, especially for extern globals
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-22
CC| |rguenth at gcc dot gnu.org,
| |vries at gcc dot gnu.org
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. Debug info is now more complete. Note
-feliminate-unused-debug-symbols is only implemented for STABS debugging, not
for DWARF and from
my reading implementing it for DWARF is what you'd like to see.
If you use GCC 8 or newer and LTO and apply dwarf compression using the dwz
tool the final debug info will be smaller than with GCC 4.9. Unfortunately
dwarf compression doesn't help when not using LTO as it seems to be "confused"
by location attributes.
Let's make this bug a request for implementing -feliminate-unused-debug-symbols
for DWARF.
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Subject: [Bug c++/86969] [8/9 Regression] ICE (in tsubst_copy) for a generic recursive lambda
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug c++/86970] Rejected constexpr expression involving lambdas and inheritance, "use of this in a constant expression"
Date: Wed, 22 Aug 2018 08:06:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-22
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
clang accepts it.
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Subject: [Bug fortran/86945] [8/9 Regression] BUG with optimisation of select case statement in gfortran
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--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Aug 22 08:07:36 2018
New Revision: 263761
URL: https://gcc.gnu.org/viewcvs?rev=263761&root=gcc&view=rev
Log:
2018-08-22 Richard Biener <rguenther@suse.de>
PR tree-optimization/86945
* tree-cfg.c (generate_range_test): Use unsigned arithmetic.
* gcc.dg/torture/pr86945.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr86945.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-cfg.c
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Subject: [Bug c++/86971] -Wabi warns it will not warn about anything.
Date: Wed, 22 Aug 2018 08:11:00 -0000
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Alexander Monakov from comment #2)
> I think the wording of the opening line can be made unambiguous, which is
> probably nice for translators. Can we change it to say e.g.:
>
> cc1plus: warning: -Wabi by itself does not issue any warnings
Maybe
cc1plus: warning: -Wabi without specified version does not issue any warnings
? Btw, is that true when I use -fabi-version=11 -Wabi?
>From gcc-bugs-return-613336-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 08:16:27 2018
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Subject: [Bug target/86973] [6/7/8/9 Regression] ICE in expand_call, at calls.c:4217
Date: Wed, 22 Aug 2018 08:15:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug tree-optimization/86945] [8 Regression] BUG with optimisation of select case statement in gfortran
Date: Wed, 22 Aug 2018 08:19:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|fortran |tree-optimization
Known to work| |9.0
Summary|[8/9 Regression] BUG with |[8 Regression] BUG with
|optimisation of select case |optimisation of select case
|statement in gfortran |statement in gfortran
Known to fail|9.0 |
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
>From gcc-bugs-return-613338-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 08:20:01 2018
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Subject: [Bug c++/86974] Support Clang's require_constant_initialization attribute
Date: Wed, 22 Aug 2018 08:20:00 -0000
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, can't the thing be just marked constexpr?
>From gcc-bugs-return-613339-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 08:22:37 2018
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Subject: [Bug middle-end/86979] [9 Regression] ICE: in maybe_record_trace_start, at dwarf2cfi.c:2348 with -m32 on darwin
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-apple-darwin
Target Milestone|--- |9.0
>From gcc-bugs-return-613340-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 08:29:23 2018
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Subject: [Bug c/86983] documentation inconsistent with always_inline diagnostics for computed goto
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |documentation
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-22
CC| |hubicka at gcc dot gnu.org,
| |jsm28 at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
case GIMPLE_GOTO:
t = gimple_goto_dest (stmt);
/* We will not inline a function which uses computed goto. The
addresses of its local labels, which may be tucked into
global storage, are of course not constant across
instantiations, which causes unexpected behavior. */
if (TREE_CODE (t) != LABEL_DECL)
{
inline_forbidden_reason
= G_("function %q+F can never be inlined "
"because it contains a computed goto");
*handled_ops_p = true;
return t;
}
we have to assume that the goto is to labels of the function or functions
inlined into it. We do not seem to compute whether any of those escape
(your testcase returns them though).
So the wording is correct and the Labels-as-Values documentation is
wrong.
Of course if we get enough analysis GCC might decide to inline, all the
wording always applies to a concrete implementation and is not to be
treated as language specification.
>From gcc-bugs-return-613341-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 08:32:06 2018
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Subject: [Bug c++/86974] Support Clang's require_constant_initialization attribute
Date: Wed, 22 Aug 2018 08:32:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No because that also makes it const, i.e. immutable.
It's useful for non-const globals.
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Subject: [Bug target/86984] invalid relocation accessing a const char array
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed I assume.
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Subject: [Bug debug/86985] Generated DWARF does not distinguish between zero-length and flexible array types
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-22
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-613344-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 08:43:51 2018
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Subject: [Bug c++/86986] [6/7/8/9 Regression] Unexpected errors for template parameter pack in a template template parameter
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>From gcc-bugs-return-613345-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 08:52:10 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/86971] -Wabi warns it will not warn about anything.
Date: Wed, 22 Aug 2018 08:52:00 -0000
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #4)
> ? Btw, is that true when I use -fabi-version=11 -Wabi?
That will give warnings.
-Wabi (with no =n value) is only useless without an explicit -fabi-version,
because it means "warn about incompatibilities with the default -fabi-version".
If you don't use -fabi-version then you're using the default, and so there are
no differences.
>From gcc-bugs-return-613346-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 08:52:28 2018
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From: "ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/86519] [9 Regression] New test case gcc.dg/strcmpopt_6.c fails with its introduction in r262636
Date: Wed, 22 Aug 2018 08:52:00 -0000
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--- Comment #20 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #19 from qinzhao at gcc dot gnu.org ---
> which sparc machine was used to repeat the failure, and what's the configure
> and make options?
I just saw there are gcc210 and gcc211 in the compile farm running
Solaris 10 and 11 respectively. No specific configure options should be
necessary to reproduce this.
>From gcc-bugs-return-613347-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 08:54:37 2018
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Subject: [Bug tree-optimization/86988] [7/9 Regression] ICE: tree check: expected integer_cst, have var_decl in get_len, at tree.h:5563
Date: Wed, 22 Aug 2018 08:54:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-22
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Target Milestone|--- |7.4
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Testing
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c
index 24e089b019b..ead19f15996 100644
--- a/gcc/tree-vrp.c
+++ b/gcc/tree-vrp.c
@@ -4581,6 +4581,7 @@ vrp_prop::check_mem_ref (location_t location, tree ref,
tree reftype = TREE_TYPE (arg);
if (POINTER_TYPE_P (reftype)
|| !COMPLETE_TYPE_P (reftype)
+ || TREE_CODE (TYPE_SIZE_UNIT (reftype)) != INTEGER_CST
|| RECORD_OR_UNION_TYPE_P (reftype))
return;
for trunk.
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Subject: [Bug tree-optimization/86990] [9 Regression] wrong code at -O2 on x86_64-linux-gnu in 64-bit mode
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Subject: [Bug tree-optimization/86991] [8/9 Regression] ICE in vectorizable_reduction, at tree-vect-loop.c:6919
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will have a look.
>From gcc-bugs-return-613350-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 08:56:53 2018
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Subject: [Bug c++/86993] [6/7/8/9 Regression] assignment of read-only variable error reported at wrong location
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug middle-end/86995] [9 regression] c-c++-common/torture/builtin-arith-overflow-17.c etc. FAIL
Date: Wed, 22 Aug 2018 09:01:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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CC| |law at gcc dot gnu.org
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
From looking at svn log it must be caused by
r263591 | law | 2018-08-16 18:33:43 +0200 (Thu, 16 Aug 2018) | 8 lines
* expmed.h (canonicalize_comparison): New declaration.
* expmed.c (canonicalize_comparison, equivalent_cmp_code): New
function.
* expmed.c (emit_store_flag_1): Add call to canonicalize_comparison.
* optabs.c (prepare_cmp_insn): Likewise.
* rtl.h (unsigned_condition_p): New function which checks if a
comparison operator is unsigned.
* gcc.target/aarch64/imm_choice_comparison.c: New test.
Vlad doesn't seem to have a bugzilla account.
>From gcc-bugs-return-613352-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 09:02:05 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug driver/87056] New: [9 Regression] GCC does not work when using -pipe
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Bug ID: 87056
Summary: [9 Regression] GCC does not work when using -pipe
Product: gcc
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Probably starting from r263679 I see:
$ gcc /tmp/empty.c -c -pipe
gcc: error: close: No such file or directory
abuild@kunlun:~> /tmp/empty.c:1:1: fatal error: error closing -: Broken pipe
1 | int main() {}
| ^~~
compilation terminated.
when running in GDB:
Breakpoint 1, 0x00007ffff7b03520 in close () from /lib64/libc.so.6
(gdb) bt
#0 0x00007ffff7b03520 in close () from /lib64/libc.so.6
#1 0x0000000000445f21 in pex_run_in_environment (err=0x7fffffffe71c,
errname=<optimized out>, orig_outname=<optimized out>, env=0x0, argv=<optimized
out>, executable=<optimized out>, flags=<optimized out>, obj=0x53fbe0) at
../../libiberty/pex-common.c:359
#2 pex_run (obj=0x53fbe0, flags=<optimized out>, executable=<optimized out>,
argv=<optimized out>, orig_outname=<optimized out>, errname=<optimized out>,
err=0x7fffffffe71c) at ../../libiberty/pex-common.c:374
#3 0x000000000045534d in execute() () at ../../gcc/gcc.c:3166
#4 0x0000000000453e29 in do_spec(char const*) () at ../../gcc/gcc.c:4957
#5 0x00000000004535bc in driver::do_spec_on_infiles() const () at
../../gcc/gcc.c:8107
#6 0x0000000000447ae6 in driver::main(int, char**) () at ../../gcc/gcc.c:7334
#7 0x0000000000447cb4 in main (argc=4, argv=0x7fffffffea38) at
../../gcc/gcc-main.c:47
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug driver/87056] [9 Regression] GCC does not work when using -pipe
Date: Wed, 22 Aug 2018 09:04:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-22
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Would be related to:
gcc -c -DHAVE_CONFIG_H -g -O2 -I.
-I/home/marxin/Programming/gcc/libiberty/../include -W -Wall -Wwrite-strings
-Wc++-compat -Wstrict-prototypes -Wshadow=local -pedantic -D_GNU_SOURCE
/home/marxin/Programming/gcc/libiberty/pex-unix.c -o pex-unix.o
/home/marxin/Programming/gcc/libiberty/pex-unix.c: In function
‘pex_unix_exec_child’:
/home/marxin/Programming/gcc/libiberty/pex-unix.c:659:6: warning: declaration
of ‘err’ shadows a parameter [-Wshadow=local]
int err = errno;
^~~
/home/marxin/Programming/gcc/libiberty/pex-unix.c:569:47: note: shadowed
declaration is here
int toclose, const char **errmsg, int *err)
~~~~~^~~
I'm going to fix it.
>From gcc-bugs-return-613354-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 09:06:00 2018
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Subject: [Bug tree-optimization/86999] missed FMA optimization with -fassociative-math
Date: Wed, 22 Aug 2018 09:05:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|wrong-code |
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-22
CC| |rguenth at gcc dot gnu.org
Component|middle-end |tree-optimization
Summary|Incorrect code generation |missed FMA optimization
|and missing optimization |with -fassociative-math
|with -fno-signed-zeros. |
Ever confirmed|0 |1
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
So as far as I understand comment#1 remains. The FMA pass should
handle (x +- 1)*y and (1 - x)*y.
>From gcc-bugs-return-613355-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 09:08:51 2018
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Subject: [Bug libstdc++/77854] std::deque doesn't use allocator's size_type and difference_type
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |documentation
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Our other containers do the same, which is OK.
The standard requires that difference_type "is identical to the difference type
of X::iterator and X::const_iterator" and "size_type can represent any
non-negative value of difference_type".
So in fact they need to correspond to the container's iterators, not come from
the allocator.
We do need to document the types though, because they're
implementation-defined.
>From gcc-bugs-return-613356-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 09:09:39 2018
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Subject: [Bug target/87006] Stack Protection with Large File support
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
.
>From gcc-bugs-return-613357-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 09:10:50 2018
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Subject: [Bug target/87007] [8/9 Regression] 10% slowdown with -march=skylake-avx512
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-613358-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 09:17:12 2018
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Subject: [Bug tree-optimization/87008] [8/9 Regression] gimple mem-to-mem assignment badly optimized
Date: Wed, 22 Aug 2018 09:17:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-22
CC| |jamborm at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Target Milestone|--- |8.3
Ever confirmed|0 |1
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #2)
> Or just:
>
> struct A { double a, b; };
> struct B : A {};
> double f(B x){
> B y;
> A*px=&x;
> A*py=&y;
> *py=*px;
> return y.a;
> }
>
> MEM[(struct A *)&y] = MEM[(const struct A &)&x];
> y_6 = MEM[(struct A *)&y];
> y ={v} {CLOBBER};
> return y_6;
>
> where y_6 should be read directly from x. SRA doesn't dare touch it. SCCVN
> does see that reading from y is equivalent to reading from x, but unless
> something else is already reading from x, it keeps the read from y.
Yeah, SCCVN doesn't change the read to one from x because generally it
cannot know y will go away and reading from x possibly enlarges its
lifetime (no stack sharing).
To really handle this we need to expose the way we'd expand such aggregate
copies to RTL already at GIMPLE stage. SRA could be the pass that should
eventually do that (but of course avoid exposing copy loops or calls to
memcpy we might expand to ...). So it boils down to heuristics again...
>From gcc-bugs-return-613359-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 09:26:20 2018
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Subject: [Bug driver/87056] [9 Regression] GCC does not work when using -pipe
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |NEW
CC| |nathan at gcc dot gnu.org
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
No, the warning was here even before..
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Subject: [Bug tree-optimization/87008] [8/9 Regression] gimple mem-to-mem assignment badly optimized
Date: Wed, 22 Aug 2018 09:31:00 -0000
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #1)
> struct A { double a, b; };
> struct B : A {};
> template<class T>void cp(T&a,T const&b){a=b;}
> double f(B x){
> B y; cp<A>(y,x);
> B z; cp<A>(z,x);
> return y.a - z.a;
> }
>
> This is not quite equivalent because RTL manages to optimize this case, but
> gimple, with -Ofast, still gets the ugly:
>
> ISRA.1 = MEM[(const struct A &)&x];
> SR.9_9 = MEM[(struct A *)&ISRA.1];
> ISRA.1 = MEM[(const struct A &)&x];
> SR.8_10 = MEM[(struct A *)&ISRA.1];
> _3 = SR.9_9 - SR.8_10;
> return _3;
>
> Writing cp<B> instead of cp<A> makes it work, and the main difference starts
> in SRA. I expect (didn't check) this is another victim of r255510 .
The initial IL is too convoluted for early FRE to figure out the equivalences.
For the above which is visible to the late FRE the issue is that the
redundant aggregate copy gets in the way which isn't detected in early FRE
and FRE also doesn't try to remove or detect redundant aggregate copies
because we don't really "value-number" aggregate stores.
To sum up it - aggregate copies are bad ;) But they also sometimes
help - all the vn_reference_op_lookup_3 tricks wouldn't work without
them unless you end up with store pieces that always fully cover all
downstream loads.
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Subject: [Bug middle-end/87009] Can't find XOR pattern applying De Morgan sequentially
Date: Wed, 22 Aug 2018 09:32:00 -0000
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----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-22
Component|tree-optimization |middle-end
Ever confirmed|0 |1
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Subject: [Bug tree-optimization/87011] [9 Regression] partially dead memset before strcpy not eliminated
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug c++/87012] [7/8/9 Regression] ICE in verify_unstripped_args_1
Date: Wed, 22 Aug 2018 09:37:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Priority|P3 |P2
Target Milestone|--- |7.4
Summary|[Regression] ICE in |[7/8/9 Regression] ICE in
|verify_unstripped_args_1 |verify_unstripped_args_1
>From gcc-bugs-return-613364-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 09:46:12 2018
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From: "Hi-Angel at yandex dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87057] New: in compilation error, gcc should note about deleted copy-constructor
Date: Wed, 22 Aug 2018 09:45:00 -0000
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Bug ID: 87057
Summary: in compilation error, gcc should note about deleted
copy-constructor
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: Hi-Angel at yandex dot ru
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When, in a code, a copy-constructor deleted but used, GCC issues an absolutely
unhelpful message that it couldn't convert the argument. "Why can't it?". It's
extremely difficult to diagnose — e.g. in my case I had to go down from a
project code to the minimal example below before I could figure it out. There's
really no other way, except as of magically guessing that some of fields used
in the struct being copied has its copy-constructor deleted.
FTR: to fix the code below you need to replace `return {ret}` with `return
{move(ret)}`.
# Steps to reproduce:
$ cat test.cpp
#include <memory>
#include <variant>
struct PacketErr {
std::unique_ptr<char> failed_devices;
};
std::variant<std::monostate, PacketErr> deserialize(){
PacketErr ret;
return {ret};
}
int main() {}
$ g++ test.cpp -std=c++17
test.cpp: In function ‘std::variant<std::monostate, PacketErr>
deserialize()’:
test.cpp:10:16: error: could not convert ‘{ret}’ from ‘<brace-enclosed
initializer list>’ to ‘std::variant<std::monostate, PacketErr>’
return {ret};
# Expected
GCC should mention that a copy is not possible since there's a copy-constructor
deleted.
# Actual
GCC basically says there's some error at the line — go figure what problem is
it.
>From gcc-bugs-return-613365-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 09:48:57 2018
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Subject: [Bug target/86947] Erroneous code generated with O2 and O3 for PPC
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----------------------------------------------------------------------------
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--- Comment #2 from Vinay Kumar <vinay.m.engg at gmail dot com> ---
Created attachment 44571
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44571&action=edit
Testcase t1.c
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Subject: [Bug target/86947] Erroneous code generated with O2 and O3 for PPC
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--- Comment #3 from Vinay Kumar <vinay.m.engg at gmail dot com> ---
Created attachment 44572
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Testcase t2.c
>From gcc-bugs-return-613367-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 09:50:24 2018
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Subject: [Bug target/86947] Erroneous code generated with O2 and O3 for PPC
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--- Comment #4 from Vinay Kumar <vinay.m.engg at gmail dot com> ---
Hi Richard,
Thanks for checking the bug.
Please find attached the testcase that would exit with message
"Should NOT BE here" on miscompilation.
The behavior is same with other targets as well.
We have checked it with latest X86 and Aarch64 targets.
gcc t1.c t2.c -O2 -m64 -lm
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/87013] Error: junk at end of line, first unrecognized character is `i'
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |aoliva at gcc dot gnu.org
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
.loc 1 15 1 is_stmt 0
we don't seem to have an assembler test for is_stmt support. Alex?
Martin, can you attach gcc/config.log?
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87015] [8/9 Regression] miscompilation of template heavy Boost Spirit code
Date: Wed, 22 Aug 2018 09:57:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
Target Milestone|--- |8.3
Summary|[8 Regression] |[8/9 Regression]
|miscompilation of template |miscompilation of template
|heavy Boost Spirit code |heavy Boost Spirit code
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Can you check with a snapshot of the GCC 8 branch after 2018-08-17 (including
the fix for PR86763)?
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Subject: [Bug tree-optimization/87022] [8/9 Regression] miscompilation with -ftree-loop-distribution
Date: Wed, 22 Aug 2018 09:58:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Priority|P3 |P2
Known to work| |7.3.0
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Subject: [Bug c++/4898] adding an option to verify exception specifications
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--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #4)
> Dynamic exception specifications are no longer part of the C++ language
> anyway.
Well, in newer standards at least, but they were at one point in an older
standard, right?
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Subject: [Bug c++/79695] spurious -Wunused-variable on a static global of a type declared unused
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #1)
> Let me correct that: GCC warns on the first two variables, not on the local
> one defined in function g(). It used to warn on it until r145440.
cc-ing Dodji who did that commit
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Subject: [Bug ipa/87024] ICE in fold_stmt_1
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Testing patch.
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Subject: [Bug ipa/87024] [6/7/8/9 Regression] ICE in fold_stmt_1
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Summary|ICE in fold_stmt_1 |[6/7/8/9 Regression] ICE in
| |fold_stmt_1
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Subject: [Bug target/87026] [9 Regression] ICE in extract_constrain_insn_cached, at recog.c:2218
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Subject: [Bug tree-optimization/87025] [9 Regression] ICE in add_record, at optinfo-emit-json.cc:175
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CC| |dmalcolm at gcc dot gnu.org
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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| |dodji at gcc dot gnu.org
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
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Subject: [Bug ada/87058] New: FAIL: gnat.dg/slice7.adb (test for excess errors)
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Bug ID: 87058
Summary: FAIL: gnat.dg/slice7.adb (test for excess errors)
Product: gcc
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I see this extra fail when running the testsuite with --enable-checking=yes on
the branch. It is
+===========================GNAT BUG DETECTED==============================+^M
| 8.2.1 20180822 (x86_64-pc-linux-gnu) in add_expr, at tree.c:7277 |^M
| Error detected around
/space/rguenther/src/svn/gcc-8-branch/gcc/testsuite/gnat.dg/slice7.adb:35:3|^M
| Please submit a bug report; see https://gcc.gnu.org/bugs/ . |^M
| Use a subject line meaningful to you and us to track the bug. |^M
| Include the entire contents of this bug box in the report. |^M
| Include the exact command that you entered. |^M
| Also include sources listed below. |^M
+==========================================================================+^M
case INTEGER_CST:
gcc_checking_assert (!(flags & OEP_ADDRESS_OF));
for (i = 0; i < TREE_INT_CST_EXT_NUNITS (t); i++)
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87031] nios2 optimization for size - two cases of regression relatively to 5.3.0
Date: Wed, 22 Aug 2018 10:36:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-22
CC| |hubicka at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Component|target |tree-optimization
Ever confirmed|0 |1
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
size: 24-3, last_iteration: 19-3
Loop size: 24
Estimated size after unrolling: 24
so GCC estimates that unrolling doesn't change size. It arrives here
by applying it's "unrolling saves 1/3 of insns" heuristic.
First of all this isn't controlled by a --param but hard-coded. Second,
it wasn't reduced after we improved estimates of what is optimized away.
Third, we probably shouldn't apply this when optimizing the loop for size
(aka UL_NO_GROWTH).
Honza? Any opinion on the above? Did you ever try removing that * 2/3
completely?
>From gcc-bugs-return-613380-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 10:38:31 2018
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Subject: [Bug target/87033] The compiler does not generate the LWAX instruction
Date: Wed, 22 Aug 2018 10:38:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
fixed?
>From gcc-bugs-return-613381-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 10:39:09 2018
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Subject: [Bug tree-optimization/87034] [9 Regression] missing -Wformat-overflow on a sprintf %s with a wide string
Date: Wed, 22 Aug 2018 10:39:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-613382-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 10:40:47 2018
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Subject: [Bug c/87038] diagnostics: Please add warning for jumping over initializers with switch/case in C mode
Date: Wed, 22 Aug 2018 10:40:00 -0000
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think even -Wall makes sense.
>From gcc-bugs-return-613383-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 10:41:21 2018
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Subject: [Bug debug/87039] [8/9 Regression] DW_OP_fbreg used without a frame base on a C++ code w/ -fopenmp
Date: Wed, 22 Aug 2018 10:41:00 -0000
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----------------------------------------------------------------------------
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>From gcc-bugs-return-613384-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 10:43:00 2018
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Subject: [Bug middle-end/87041] [8/9 Regression] GCC 8 regression: -Wformat "reading through null pointer" on unreachable code
Date: Wed, 22 Aug 2018 10:43:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Target Milestone|--- |8.3
Summary|GCC 8 regression: -Wformat |[8/9 Regression] GCC 8
|"reading through null |regression: -Wformat
|pointer" on unreachable |"reading through null
|code |pointer" on unreachable
| |code
>From gcc-bugs-return-613385-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 10:49:36 2018
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Subject: [Bug tree-optimization/87042] UBSAN: poly-int.h:1095:5: runtime error: signed integer overflow: 9223372036854775807 * 8 cannot be represented in type 'long int'
Date: Wed, 22 Aug 2018 10:49:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm. Those poly_offset params should have got poly_offset_int instead of
poly_uint64 (they were HOST_WIDE_INT though, not offset_int).
Well, we should fix it nevertheless, but fixing comes at a cost :/
The particular case might be fixed by simply guarding the fold_ctor_reference
call for too big offset.
>From gcc-bugs-return-613386-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 10:57:55 2018
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Subject: [Bug fortran/87043] maybe-uninitialized warning for initialized variable
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
In .original I see
if (world_rank == 0)
{
...
stat.0 = 0;
error_messages.data = (void * restrict) __builtin_malloc
(MAX_EXPR <size.1, 1>);
if (__builtin_expect ((integer(kind=8))
(error_messages.data == 0B), 0, 40))
{
stat.0 = 5014;
}
}
}
if (stat.0 == 0)
{
error_messages.dim[0].lbound = 1;
error_messages.dim[0].ubound = (integer(kind=8)) world_size;
error_messages.dim[0].stride = 1;
error_messages.offset = -1;
}
if (__builtin_expect ((integer(kind=8)) (stat.0 != 0), 0, 40)) goto
L.2;
L.2:;
allocstat = stat.0;
}
...
L.1:;
if (world_rank == 0)
{
{
integer(kind=4) limit.4;
character(kind=1)[0:][1:80] * restrict D.3813;
integer(kind=8) D.3814;
integer(kind=8) D.3815;
integer(kind=8) D.3816;
limit.4 = -2147483648;
D.3813 = (character(kind=1)[0:][1:80] * restrict)
error_messages.data;
D.3814 = error_messages.offset;
D.3815 = error_messages.dim[0].lbound;
D.3816 = error_messages.dim[0].ubound;
so when error_messages allocation fails then you access uninitialized
error_messages.
Not sure if
allocate(error_messages(world_size), stat=allocstat)
max_err_len = maxval(len_trim(error_messages))
is well-defined fortran iff allocation fails? I suppose not, so
warning is correct, testcase is broken?
>From gcc-bugs-return-613387-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 10:59:16 2018
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Subject: [Bug tree-optimization/87046] Incorrect vectorization of fma with -O3
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |needs-bisection
CC| |marxin at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Martin, can you bisect what fixed this?
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Subject: [Bug tree-optimization/86988] [7/9 Regression] ICE: tree check: expected integer_cst, have var_decl in get_len, at tree.h:5563
Date: Wed, 22 Aug 2018 11:02:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Aug 22 11:01:58 2018
New Revision: 263762
URL: https://gcc.gnu.org/viewcvs?rev=263762&root=gcc&view=rev
Log:
2018-08-22 Richard Biener <rguenther@suse.de>
PR tree-optimization/86988
* tree-vrp.c (vrp_prop::check_mem_ref): Bail out on VLAs.
* g++.dg/pr86988.C: New testcase.
Added:
trunk/gcc/testsuite/g++.dg/pr86988.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vrp.c
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Subject: [Bug target/87047] [7/8/9 Regression] performance regression because of if-conversion
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-*-*, i?86-*-*
Component|rtl-optimization |target
Target Milestone|--- |7.4
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Subject: [Bug libfortran/87048] [9 Regression] array_constructor_8.f90 failure on armeb
Date: Wed, 22 Aug 2018 11:04:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Target| |armeb
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Odd bisection result so not exact revision?
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Subject: [Bug middle-end/87049] __clear_cache() prototype confusion
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
probably easiest to rectify the builtin type.
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Subject: [Bug target/87033] The compiler does not generate the LWAX instruction
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|powerpc64-linux-gnu-*, |powerpc*-*-*
|powerpc64le-linux-gnu-* |
Host|powerpc64-linux-gnu-*, |
|powerpc64le-linux-gnu-* |
Build|powerpc64-linux-gnu-*, |
|powerpc64le-linux-gnu-* |
--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Backports are wanted still.
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Subject: [Bug middle-end/87054] misaligned asm output is turned into dereferenced pointer-to-aligned
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
there's no member 'unpacked'. With chaning 'c' to unpacked and using "+x" on
x86_64 I see
_2 = &b[i].unpacked;
_3 = *_2;
__asm__("" : "=x" *_2 : "0" _3);
which is probably what you refer to.
Can you test the following? The code indeed seems to be overly simplistic...
diff --git a/gcc/gimplify.c b/gcc/gimplify.c
index e35137aec2c..117e5fcedc9 100644
--- a/gcc/gimplify.c
+++ b/gcc/gimplify.c
@@ -12540,9 +12540,15 @@ gimplify_expr (tree *expr_p, gimple_seq *pre_p,
gimple_seq *post_p,
/* An lvalue will do. Take the address of the expression, store it
in a temporary, and replace the expression with an INDIRECT_REF of
that temporary. */
+ tree ref_alias_type = reference_alias_ptr_type (*expr_p);
+ unsigned int ref_align = get_object_alignment (*expr_p);
+ tree ref_type = TREE_TYPE (*expr_p);
tmp = build_fold_addr_expr_loc (input_location, *expr_p);
gimplify_expr (&tmp, pre_p, post_p, is_gimple_reg, fb_rvalue);
- *expr_p = build_simple_mem_ref (tmp);
+ if (TYPE_ALIGN (ref_type) != ref_align)
+ ref_type = build_aligned_type (ref_type, ref_align);
+ *expr_p = build2 (MEM_REF, ref_type,
+ tmp, build_zero_cst (ref_alias_type));
}
else if ((fallback & fb_rvalue) && is_gimple_reg_rhs_or_call (*expr_p))
{
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Subject: [Bug tree-optimization/87046] Incorrect vectorization of fma with -O3
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed in r259840.
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Subject: [Bug target/52795] FAIL: gcc.dg/tree-prof/pr34999.c compilation, -fprofile-use -D_PROFILE_USE on {x86_64,i386}-apple-darwin{10,11} at -m64
Date: Wed, 22 Aug 2018 11:37:00 -0000
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--- Comment #10 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Wed Aug 22 11:37:02 2018
New Revision: 263763
URL: https://gcc.gnu.org/viewcvs?rev=263763&root=gcc&view=rev
Log:
Fix FDE labels for Darwin
gcc/
PR bootstrap/81033
PR target/81733
PR target/52795
* gcc/dwarf2out.c (FUNC_SECOND_SECT_LABEL): New.
(dwarf2out_switch_text_section): Generate a local label for the second
function sub-section and apply it as the second FDE start label.
* gcc/final.c (final_scan_insn_1): Emit second FDE label after the
second
sub-section start.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
trunk/gcc/final.c
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Subject: [Bug target/81733] stage1 libgcc_s.dylib fails to link on Darwin 11/x86_64
Date: Wed, 22 Aug 2018 11:37:00 -0000
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--- Comment #18 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Wed Aug 22 11:37:02 2018
New Revision: 263763
URL: https://gcc.gnu.org/viewcvs?rev=263763&root=gcc&view=rev
Log:
Fix FDE labels for Darwin
gcc/
PR bootstrap/81033
PR target/81733
PR target/52795
* gcc/dwarf2out.c (FUNC_SECOND_SECT_LABEL): New.
(dwarf2out_switch_text_section): Generate a local label for the second
function sub-section and apply it as the second FDE start label.
* gcc/final.c (final_scan_insn_1): Emit second FDE label after the
second
sub-section start.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
trunk/gcc/final.c
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Subject: [Bug bootstrap/81033] [8/9 Regression] there are cases where ld64 is not able to determine correct atom boundaries from the output GCC currently produces
Date: Wed, 22 Aug 2018 11:37:00 -0000
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--- Comment #45 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Wed Aug 22 11:37:02 2018
New Revision: 263763
URL: https://gcc.gnu.org/viewcvs?rev=263763&root=gcc&view=rev
Log:
Fix FDE labels for Darwin
gcc/
PR bootstrap/81033
PR target/81733
PR target/52795
* gcc/dwarf2out.c (FUNC_SECOND_SECT_LABEL): New.
(dwarf2out_switch_text_section): Generate a local label for the second
function sub-section and apply it as the second FDE start label.
* gcc/final.c (final_scan_insn_1): Emit second FDE label after the
second
sub-section start.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
trunk/gcc/final.c
>From gcc-bugs-return-613398-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 11:39:58 2018
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Subject: [Bug bootstrap/87013] Error: junk at end of line, first unrecognized character is `i'
Date: Wed, 22 Aug 2018 11:39:00 -0000
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |aoliva at gcc dot gnu.org
--- Comment #4 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Created attachment 44573
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44573&action=edit
untested candidate patch
Yeah, it looks like we never checked for is_stmt support; we had it in
unconditionally, but it was never exercised, so it didn't come up.
This patch should be enough to avoid the problem, provided that gcc/configure
and gcc/config.in are regenerated after putting the configure.ac change in.
I'll turn that into a proper patch eventually, but I'd appreciate confirmation
that it does solve the problem indeed. Thanks,
>From gcc-bugs-return-613400-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 11:42:22 2018
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Subject: [Bug tree-optimization/85597] [6 Regression] internal compiler error: in compute_live_loop_exits, at tree-ssa-loop-manip.c:229
Date: Wed, 22 Aug 2018 11:42:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |yates at cscs dot ch
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 87046 has been marked as a duplicate of this bug. ***
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Subject: [Bug tree-optimization/87046] Incorrect vectorization of fma with -O3
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Dup.
*** This bug has been marked as a duplicate of bug 85597 ***
>From gcc-bugs-return-613401-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 11:43:39 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/4898] adding an option to verify exception specifications
Date: Wed, 22 Aug 2018 11:43:00 -0000
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, but IMHO it would be a huge waste of time to add a ton of new machinery to
the compiler to check for "correct" usage of an obsolete feature. Most C++98
code didn't even use them, because they were not useful. Most code still using
them should never have used them in the first place, because they don't work
the way people think. C++ is not Java.
From the original rationale:
(In reply to luc.maisonobe from comment #0)
> C++ allows to specify exceptions in the function declaration
> but do not enforces it. When lots of classes and methods are
> involved, maintaining up-to-date specifications is very
> difficult, and every missed exception create runtime
> problems (unexpected exception -> abort -> core dumped). For
That's a reason to avoid using them, not a reason to complicate the compiler.
> the moment the lack of support tools prevents developers
> from using these specifications effectively.
Even with tooling they can't be used effectively.
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Subject: [Bug c++/4898] adding an option to verify exception specifications
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--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #2)
> I agree a new warning would be useful. For example, the following code should
> be diagnosed:
>
> struct S { S () throw () { throw 0; } };
This is still relevant in current standards, where throw() is equivalent to
noexcept.
Clang warns:
throw.cc:1:28: warning: 'S' has a non-throwing exception specification but can
still throw [-Wexceptions]
struct S { S () throw () { throw 0; } };
^
throw.cc:1:12: note: function declared non-throwing here
struct S { S () throw () { throw 0; } };
^ ~~~~~~~~
1 warning generated.
GCC only warns if we replace throw() with noexcept:
struct S { S () noexcept { throw 0; } };
throw.cc: In constructor 'S::S()':
throw.cc:1:34: warning: throw will always call terminate() [-Wterminate]
1 | struct S { S () noexcept { throw ""; } };
| ^~
We should warn for the equivalent throw() as well.
> as should this:
>
> struct S { S () throw (int) { throw ""; } };
Clang doesn't bother warning about this, with -std=c++98 or any other mode.
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Subject: [Bug middle-end/87055] Unoptimal address calculation
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |x86_64-*-*, i?86-*-*
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-22
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Isn't that a target (cost) issue?
Failed to match this instruction:
(set (reg:SI 94)
(mem:SI (plus:DI (sign_extract:DI (mult:DI (subreg:DI (plus:SI (reg/v:SI 89
[ i ])
(const_int 1 [0x1])) 0)
(const_int 4 [0x4]))
(const_int 34 [0x22])
(const_int 0 [0]))
(symbol_ref:DI ("a") [flags 0x2] <var_decl 0x7fb5206f3e10 a>)) [1
a S4 A32]))
looks like the usual type issue to me since it works with i being long where
combine then successfully matches
(set (reg:SI 93)
(mem:SI (plus:DI (mult:DI (reg/v:DI 89 [ i ])
(const_int 4 [0x4]))
(const:DI (plus:DI (symbol_ref:DI ("a") [flags 0x2] <var_decl
0x7fcf728d6e10 a>)
(const_int 4 [0x4])))) [1 a S4 A32]))
I guess we need to exploit the undefined overflow of i+1 on GIMPLE though
which would mean handling this in a IVOPTs-like pass (SLSR?). Or we need
to promote address computation parts (array indexes) earlier. Or we need
to avoid using a DImode multiply for SImode indexes... (we only need
a widening multiply).
Anyway, clang correctly doesn't optimize
int a[256];
int foo (unsigned int i)
{
return a[i+1];
}
I think we have a duplicate of this bug somewhere.
>From gcc-bugs-return-613404-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 11:53:05 2018
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Subject: [Bug driver/87056] [9 Regression] GCC does not work when using -pipe
Date: Wed, 22 Aug 2018 11:53:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
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From: "anton at samba dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87059] New: internal compiler error: in set_value_range, at tree-vrp.c:289
Date: Wed, 22 Aug 2018 11:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87059
Bug ID: 87059
Summary: internal compiler error: in set_value_range, at
tree-vrp.c:289
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: anton at samba dot org
CC: meissner at gcc dot gnu.org, segher at gcc dot gnu.org,
wschmidt at gcc dot gnu.org
Target Milestone: ---
Target: powerpc64le-linux
The following test case:
#include <string.h>
void d(void);
char *a, *b;
void c(void) {
if (b == a)
return;
if (strncmp(a, "", b - a))
d();
}
hits an ICE on trunk:
gcc -O2 test.c
during RTL pass: expand
test.c: In function ‘c’:
test.c:9:7: internal compiler error: in set_value_range, at tree-vrp.c:289
9 | if (strncmp(a, "", b - a))
| ^~~~~~~~~~~~~~~~~~~~~
0x10d3ceb7 set_value_range(value_range*, value_range_type, tree_node*,
tree_node*, bitmap_head*)
../../gcc/gcc/tree-vrp.c:289
0x10d4106f extract_range_from_binary_expr_1(value_range*, tree_code,
tree_node*, value_range*, value_range*)
../../gcc/gcc/tree-vrp.c:1893
0x10d43a2b determine_value_range_1
../../gcc/gcc/tree-vrp.c:6866
0x10d43cbf determine_value_range(tree_node*,
generic_wide_int<wide_int_storage>*, generic_wide_int<wide_int_storage>*)
../../gcc/gcc/tree-vrp.c:6901
0x1036385b get_size_range(tree_node*, tree_node**, bool)
../../gcc/gcc/calls.c:1258
0x10369c5b maybe_warn_nonstring_arg(tree_node*, tree_node*)
../../gcc/gcc/calls.c:1617
0x1036c003 initialize_argument_information
../../gcc/gcc/calls.c:2197
0x1036d367 expand_call(tree_node*, rtx_def*, int)
../../gcc/gcc/calls.c:3577
0x103454ef expand_builtin_strncmp
../../gcc/gcc/builtins.c:4793
0x10355f5b expand_builtin(tree_node*, rtx_def*, rtx_def*, machine_mode, int)
../../gcc/gcc/builtins.c:7445
0x1052816f expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
../../gcc/gcc/expr.c:10943
0x10542cc3 expand_expr
../../gcc/gcc/expr.h:279
0x10542cc3 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
../../gcc/gcc/expr.c:8456
0x10528703 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
../../gcc/gcc/expr.c:11230
0x1053958f expand_expr
../../gcc/gcc/expr.h:279
0x1053958f store_expr(tree_node*, rtx_def*, int, bool, bool)
../../gcc/gcc/expr.c:5556
0x1053b6a3 expand_assignment(tree_node*, tree_node*, bool)
../../gcc/gcc/expr.c:5420
0x10388133 expand_call_stmt
../../gcc/gcc/cfgexpand.c:2685
0x10388133 expand_gimple_stmt_1
../../gcc/gcc/cfgexpand.c:3575
0x10388133 expand_gimple_stmt
../../gcc/gcc/cfgexpand.c:3734
The CI that tripped up on this started failing at:
commit 9e4ef9eec6c786e3edbdcb7f26a1d735c9d7f4b9
Author: aldyh <aldyh@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue Aug 21 06:27:14 2018 +0000
* wide-int-range.cc (wide_int_range_abs): New.
(wide_int_range_order_set): Rename from wide_int_range_min_max.
* wide-int-range.h (wide_int_range_abs): New.
(wide_int_range_min_max): New.
* tree-vrp.c (extract_range_from_unary_expr): Rewrite ABS_EXPR
case to call wide_int_range_abs.
Rewrite MIN/MAX_EXPR to call wide_int_range_min_max.
(extract_range_from_abs_expr): Delete.
>From gcc-bugs-return-613406-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 12:02:16 2018
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Subject: [Bug c++/87057] in compilation error, gcc should note about deleted copy-constructor
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Konstantin Kharlamov from comment #0)
> When, in a code, a copy-constructor deleted but used, GCC issues an
> absolutely unhelpful message that it couldn't convert the argument. "Why
> can't it?". It's extremely difficult to diagnose — e.g. in my case I had to
> go down from a project code to the minimal example below before I could
> figure it out. There's really no other way, except as of magically guessing
> that some of fields used in the struct being copied has its copy-constructor
> deleted.
>
> FTR: to fix the code below you need to replace `return {ret}` with `return
> {move(ret)}`.
>
> # Steps to reproduce:
>
> $ cat test.cpp
> #include <memory>
> #include <variant>
>
> struct PacketErr {
> std::unique_ptr<char> failed_devices;
> };
>
> std::variant<std::monostate, PacketErr> deserialize(){
> PacketErr ret;
> return {ret};
> }
>
> int main() {}
> $ g++ test.cpp -std=c++17
> test.cpp: In function ‘std::variant<std::monostate, PacketErr>
> deserialize()’:
> test.cpp:10:16: error: could not convert ‘{ret}’ from ‘<brace-enclosed
> initializer list>’ to ‘std::variant<std::monostate, PacketErr>’
> return {ret};
>
> # Expected
>
> GCC should mention that a copy is not possible since there's a
> copy-constructor deleted.
I don't think that's really plausible. If fails because you cannot construct
the variant type from a PacketErr lvalue, because it fails the SFINAE
constraints.
For the compiler to tell you why it fails them it would have to analyse those
constraints and tell you that __is_accepted_index returns variant_npos, because
none of the alternatives can be constructed from PacketErr&. It would then have
to look at each alternative and see why each one fails, and then whether that
is worth reporting to the user. So it would have to try to convert PacketErr&
to monostate, and decide if any of the reasons for failure was useful to
report. Then it would have to try to convert PacketErr& to PacketErr, and see
if any of the reasons for failure was useful to report.
That would require a lot of special-casing just for std::variant.
Clang does print a lot more info, including this:
/home/jwakely/gcc/latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/../../../../include/c++/9.0.0/variant:1093:2:
note: candidate template ignored: substitution failure [with _Tp = PacketErr &,
$1 = void, $2 = void]: implicit instantiation of undefined template
'std::variant<std::monostate,
PacketErr>::__to_type_impl<18446744073709551615, false>'
variant(_Tp&& __t)
^
But that still doesn't come close to telling you that the type is not copyable.
N.B. If you just write "return ret;" it will compile fine. In general "return
x;" is better than "return {x};" because it doesn't prevent NRVO.
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Subject: [Bug c++/87057] in compilation error, gcc should note about deleted copy-constructor
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--- Comment #2 from Konstantin Kharlamov <Hi-Angel at yandex dot ru> ---
(In reply to Jonathan Wakely from comment #1)
> That would require a lot of special-casing just for std::variant.
Well, I think, in place of std::variant there could be any struct-wrapper; but
I get it.
> Clang does print a lot more info, including this:
>
> /home/jwakely/gcc/latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/../../../../
> include/c++/9.0.0/variant:1093:2: note: candidate template ignored:
> substitution failure [with _Tp = PacketErr &, $1 = void, $2 = void]:
> implicit instantiation of undefined template
> 'std::variant<std::monostate,
> PacketErr>::__to_type_impl<18446744073709551615, false>'
> variant(_Tp&& __t)
> ^
>
> But that still doesn't come close to telling you that the type is not
> copyable.
Actually, GCC does give the like output if you'd replace `return {ret}` with
explicit `return std::variant<std::monostate, PacketErr>{ret}`, though it
doesn't hint about the type being non-copyable either.
> N.B. If you just write "return ret;" it will compile fine. In general
> "return x;" is better than "return {x};" because it doesn't prevent NRVO.
Thanks, I prefer the `{x}` to just `x` because in the latter I'm being explicit
that the `x` is not the type I'm returning, but there's some other type that
it's being wrapped to.
As far as such trivial optimizations concerned, I'd prefer to rely on the
compiler figuring that out — in the end, that's why we don't write assembly,
right? =)
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Subject: [Bug c++/87057] in compilation error, gcc should note about deleted copy-constructor
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--- Comment #3 from Konstantin Kharlamov <Hi-Angel at yandex dot ru> ---
(In reply to Konstantin Kharlamov from comment #2)
> Thanks, I prefer the `{x}` to just `x` because in the latter I'm being
*"in the former", sorry.
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Subject: [Bug libstdc++/77854] std::deque doesn't use allocator's size_type and difference_type
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Aug 22 12:11:17 2018
New Revision: 263767
URL: https://gcc.gnu.org/viewcvs?rev=263767&root=gcc&view=rev
Log:
PR libstdc++/77854 document size_type for containers
PR libstdc++/77854
* doc/xml/manual/status_cxx1998.xml: Document size_type and
difference_type for containers.
* doc/html/*: Regenerate.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/doc/html/manual/abi.html
trunk/libstdc++-v3/doc/html/manual/bugs.html
trunk/libstdc++-v3/doc/html/manual/status.html
trunk/libstdc++-v3/doc/xml/manual/status_cxx1998.xml
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Subject: [Bug libstdc++/77854] std::deque doesn't use allocator's size_type and difference_type
Date: Wed, 22 Aug 2018 12:12:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Done.
>From gcc-bugs-return-613411-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 12:13:24 2018
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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug other/704] --help and --version
Date: Wed, 22 Aug 2018 12:13:00 -0000
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--- Comment #15 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Wed Aug 22 12:12:46 2018
New Revision: 263768
URL: https://gcc.gnu.org/viewcvs?rev=263768&root=gcc&view=rev
Log:
Make the gcc-ar,nm, strip tools respond correctly to --help and --version
when there's no plugin built.
gcc/
PR other/704
* gcc-ar.c (main): Don’t try to invoke the plug-in if we’re not
building it.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/gcc-ar.c
>From gcc-bugs-return-613412-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 12:21:41 2018
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Subject: [Bug fortran/87043] maybe-uninitialized warning for initialized variable
Date: Wed, 22 Aug 2018 12:21:00 -0000
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--- Comment #2 from Peter Vitt <pvitt at posteo dot de> ---
Oh, I see your point. But then still the question is why this warning is not
shown when compiling with -Og.
>From gcc-bugs-return-613413-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 12:31:58 2018
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Subject: [Bug middle-end/87049] __clear_cache() prototype confusion
Date: Wed, 22 Aug 2018 12:31:00 -0000
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--- Comment #2 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
But won't that give problems for C++ because now you'll need to cast the
pointers?
>From gcc-bugs-return-613414-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 12:38:08 2018
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Subject: [Bug target/87047] [7/8/9 Regression] performance regression because of if-conversion
Date: Wed, 22 Aug 2018 12:38:00 -0000
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--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Andrew Pinski from comment #2)
> I suspect it is treating cost 0 as being free rather than unknown cost. And
> the x86 backend is returning 0 cost for the upper multiple.
There is no truncate RTX present in the dumps.
But in any case, moving 10+ insns out of THEN block seems excessive:
IF-THEN-JOIN block found, pass 1, test 34, then 35, join 15
scanning new insn with uid = 320.
scanning new insn with uid = 321.
scanning new insn with uid = 322.
scanning new insn with uid = 323.
scanning new insn with uid = 324.
scanning new insn with uid = 325.
scanning new insn with uid = 326.
scanning new insn with uid = 327.
scanning new insn with uid = 328.
scanning new insn with uid = 329.
scanning new insn with uid = 330.
if-conversion succeeded through noce_try_cmove_arith
Removing jump 225.
deleting insn with uid = 225.
deleting insn with uid = 235.
deleting insn with uid = 286.
deleting insn with uid = 232.
deleting insn with uid = 231.
deleting insn with uid = 230.
deleting insn with uid = 229.
deleting insn with uid = 284.
deleting insn with uid = 227.
deleting block 35
Conversion succeeded on pass 1.
...
* 224: flags:CCZ=cmp(r245:SI,0)
* REG_DEAD r245:SI
225: pc={(flags:CCZ!=0)?L222:pc}
REG_DEAD flags:CCZ
REG_BR_PROB 536870916
226: NOTE_INSN_BASIC_BLOCK 40
227: {r246:TI=zero_extend(r91:DI)*zero_extend(r136:DI);clobber flags:CC;}
REG_UNUSED flags:CC
284: r262:DI=r246:TI#8
REG_DEAD r246:TI
229: r249:DI=0xfffff
230: {r248:DI=r249:DI-r262:DI;clobber flags:CC;}
REG_DEAD r262:DI
REG_DEAD r249:DI
REG_UNUSED flags:CC
231: {r250:DI=r248:DI<<0x2c;clobber flags:CC;}
REG_DEAD r248:DI
REG_UNUSED flags:CC
232: {r251:TI=zero_extend(r250:DI)*zero_extend(r91:DI);clobber flags:CC;}
REG_DEAD r250:DI
REG_DEAD r91:DI
REG_UNUSED flags:CC
286: r264:DI=r251:TI#8
REG_DEAD r251:TI
235: {r91:DI=r264:DI<<0x1;clobber flags:CC;}
REG_DEAD r264:DI
REG_UNUSED flags:CC
...
is moved to:
...
* 224: flags:CCZ=cmp(r245:SI,0)
* REG_DEAD r245:SI
320: {r246:TI=zero_extend(r91:DI)*zero_extend(r136:DI);clobber flags:CC;}
321: r262:DI=r246:TI#8
322: r249:DI=0xfffff
323: {r248:DI=r249:DI-r262:DI;clobber flags:CC;}
324: {r250:DI=r248:DI<<0x2c;clobber flags:CC;}
325: {r251:TI=zero_extend(r250:DI)*zero_extend(r91:DI);clobber flags:CC;}
326: r264:DI=r251:TI#8
327: {r270:DI=r264:DI<<0x1;clobber flags:CC;}
328: {r269:DI=r243:DI<<0xf;clobber flags:CC;}
* 329: flags:CCZ=cmp(r245:SI,0)
330: r91:DI={(flags:CCZ!=0)?r269:DI:r270:DI}
...
(not to mention that (insn 224) in front should be removed as well, it is
duplicated as (insn 329)).
I don't think x86 declares all moved insn costs as 0.
>From gcc-bugs-return-613415-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 12:39:38 2018
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Subject: [Bug debug/86964] Too many debug symbols included, especially for extern globals
Date: Wed, 22 Aug 2018 12:39:00 -0000
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--- Comment #2 from Joe Lorenz <znerol at gmail dot com> ---
(In reply to Richard Biener from comment #1)
> Confirmed. Debug info is now more complete. Note
> -feliminate-unused-debug-symbols is only implemented for STABS debugging,
> not for DWARF and from
> my reading implementing it for DWARF is what you'd like to see.
>
> If you use GCC 8 or newer and LTO and apply dwarf compression using the dwz
> tool the final debug info will be smaller than with GCC 4.9. Unfortunately
> dwarf compression doesn't help when not using LTO as it seems to be
> "confused"
> by location attributes.
>
> Let's make this bug a request for implementing
> -feliminate-unused-debug-symbols
> for DWARF.
If implementing that option for DWARF will achieve the same behavior as the 4.9
version, then yes, I think that would be exactly what I'm after. I think it's
fine if the default behavior (with no added option) stays as it is. But having
control over it is essential when working with the nature of the source tree I
am saddled with.
I'm grateful for your focus and effort and I hesitate to ask, but what sort of
time frame are we talking for a change like this?
>From gcc-bugs-return-613416-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 12:53:31 2018
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Subject: [Bug c/87038] diagnostics: Please add warning for jumping over initializers with switch/case in C mode
Date: Wed, 22 Aug 2018 12:53:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #5)
> I think even -Wall makes sense.
Maybe eventually, but I think a good compromise would be to put it in -Wextra
for gcc 9, and then move it to -Wall for gcc 10, so people have time to adjust
to the gradual strictening
>From gcc-bugs-return-613417-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 13:01:51 2018
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Subject: [Bug debug/86964] Too many debug symbols included, especially for extern globals
Date: Wed, 22 Aug 2018 13:01:00 -0000
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--- Comment #3 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 22 Aug 2018, znerol at gmail dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86964
>
> --- Comment #2 from Joe Lorenz <znerol at gmail dot com> ---
> (In reply to Richard Biener from comment #1)
> > Confirmed. Debug info is now more complete. Note
> > -feliminate-unused-debug-symbols is only implemented for STABS debugging,
> > not for DWARF and from
> > my reading implementing it for DWARF is what you'd like to see.
> >
> > If you use GCC 8 or newer and LTO and apply dwarf compression using the dwz
> > tool the final debug info will be smaller than with GCC 4.9. Unfortunately
> > dwarf compression doesn't help when not using LTO as it seems to be
> > "confused"
> > by location attributes.
> >
> > Let's make this bug a request for implementing
> > -feliminate-unused-debug-symbols
> > for DWARF.
>
> If implementing that option for DWARF will achieve the same behavior as the 4.9
> version, then yes, I think that would be exactly what I'm after. I think it's
> fine if the default behavior (with no added option) stays as it is. But having
> control over it is essential when working with the nature of the source tree I
> am saddled with.
>
> I'm grateful for your focus and effort and I hesitate to ask, but what sort of
> time frame are we talking for a change like this?
Well, implementing shouldn't take more than a day or so but that day
has to be carved out of somebodies spare time to work on GCC.
Eventually Tom can help out.
>From gcc-bugs-return-613419-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 13:03:27 2018
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Subject: [Bug tree-optimization/86725] ICE: Segmentation fault (in vect_get_vec_def_for_operand_1)
Date: Wed, 22 Aug 2018 13:03:00 -0000
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--- Comment #3 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Author: rsandifo
Date: Wed Aug 22 13:02:48 2018
New Revision: 263774
URL: https://gcc.gnu.org/viewcvs?rev=263774&root=gcc&view=rev
Log:
[2/2] Fix bogus inner induction (PR 86725)
This patch is the second part of the fix for PR 86725. The problem
in the original test is that for:
outer1:
x_1 = PHI <x_4(outer2), ...>;
...
inner:
x_2 = PHI <x_1(outer1), x_3(...)>;
...
x_3 = ...;
...
outer2:
x_4 = PHI <x_3(inner)>;
...
there are corner cases in which it is possible to classify the
inner phi as an induction but not the outer phi. The -4.c test
is a more direct example.
After failing to classify x_1 as an induction, we go on to
classify it as a double reduction (which is basically true).
But we still classified the inner phi as an induction rather
than as part of a reduction, leading to an ICE when trying
to vectorise the outer phi.
We analyse the phis for outer loops first, so the simplest
fix is not to classify the phi as an induction if outer loop
analysis said that it should be a reduction.
The -2.c test is from the original PR. The -3.c test is a
version in which "wo" really is used a reduction; this was
already correctly rejected, but for the wrong reason ("inner-loop
induction only used outside of the outer vectorized loop").
The -4.c test is another way of tickling the original problem
without relying on the undefinedness of signed overflow.
The -5.c test shows an (uninteresting) example in which the
patch prevents a spurious failure to vectorise the outer loop.
2018-08-22 Richard Sandiford <richard.sandiford@arm.com>
gcc/
PR tree-optimization/86725
* tree-vect-loop.c (vect_inner_phi_in_double_reduction_p): New
function.
(vect_analyze_scalar_cycles_1): Check it.
gcc/testsuite/
PR tree-optimization/86725
* gcc.dg/vect/no-scevccp-pr86725-2.c: New test.
* gcc.dg/vect/no-scevccp-pr86725-3.c: Likewise.
* gcc.dg/vect/no-scevccp-pr86725-4.c: Likewise.
* gcc.dg/vect/no-scevccp-pr86725-5.c: Likewise.
Added:
trunk/gcc/testsuite/gcc.dg/vect/no-scevccp-pr86725-2.c
trunk/gcc/testsuite/gcc.dg/vect/no-scevccp-pr86725-3.c
trunk/gcc/testsuite/gcc.dg/vect/no-scevccp-pr86725-4.c
trunk/gcc/testsuite/gcc.dg/vect/no-scevccp-pr86725-5.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vect-loop.c
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Subject: [Bug tree-optimization/86725] ICE: Segmentation fault (in vect_get_vec_def_for_operand_1)
Date: Wed, 22 Aug 2018 13:03:00 -0000
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--- Comment #2 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Author: rsandifo
Date: Wed Aug 22 13:02:39 2018
New Revision: 263773
URL: https://gcc.gnu.org/viewcvs?rev=263773&root=gcc&view=rev
Log:
[1/2] Fix bogus double reduction (PR 86725)
This patch is the first part of the fix for PR 86725. We would
treat x_1 in:
outer1:
x_1 = PHI <x_4(outer2), ...>;
...
inner:
x_2 = ...x_1...;
...
x_3 = ...;
...
outer2:
x_4 = PHI <x_3(inner)>;
...
as a double reduction without checking what kind of statement x_2 is.
In practice it has to be a phi, since for other x_2, x_1 would simply
be a loop invariant that gets used for every inner loop iteration.
The idea with doing this patch first is that, by checking x_2 really
is a phi, we can hand off the validation of the rest of the reduction
to the phi analysis in the inner loop.
The test case is a variant of the one in the PR.
2018-08-22 Richard Sandiford <richard.sandiford@arm.com>
gcc/
PR tree-optimization/86725
* tree-vect-loop.c (vect_is_simple_reduction): When treating
an outer loop phi as a double reduction, make sure that the
single user of the phi result is an inner loop phi.
gcc/testsuite/
PR tree-optimization/86725
* gcc.dg/vect/no-scevccp-pr86725-1.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/vect/no-scevccp-pr86725-1.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vect-loop.c
>From gcc-bugs-return-613420-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 13:04:26 2018
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Subject: [Bug tree-optimization/86725] ICE: Segmentation fault (in vect_get_vec_def_for_operand_1)
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--- Comment #4 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Fixed on trunk so far.
>From gcc-bugs-return-613421-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 13:16:02 2018
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
Date: Wed, 22 Aug 2018 13:16:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |aldyh at gcc dot gnu.org
Component|target |tree-optimization
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Target Milestone|--- |9.0
Summary|internal compiler error: in |[9 Regression] internal
|set_value_range, at |compiler error: in
|tree-vrp.c:289 |set_value_range, at
| |tree-vrp.c:289
>From gcc-bugs-return-613422-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 13:47:59 2018
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
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Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Mine.
>From gcc-bugs-return-613423-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 14:09:52 2018
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Subject: [Bug target/87047] [7/8/9 Regression] performance regression because of if-conversion
Date: Wed, 22 Aug 2018 14:09:00 -0000
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--- Comment #4 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
This is probably due to logic issue in PR 78120 fix. Its Changelog said,
(noce_process_if_block): Compute an estimate for the original cost when
optimizing for speed, using the minimum of then and else block costs.
but the change was
+ if (else_bb == NULL)
+ if_info->original_cost += then_cost;
+ else if (speed_p)
+ if_info->original_cost += MIN (then_cost, else_cost);
+ else
+ if_info->original_cost += then_cost + else_cost;
so when there's no else_bb, it effectively treats its cost as infinite rather
than zero. As a result GCC wrongly decides that replacing conditionally
executed block with cost 80 by a sequence with cost 72 is fine.
It also seems strange that costs are not scaled by edge probabilities.
>From gcc-bugs-return-613424-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 14:19:46 2018
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Subject: [Bug target/86684] ICE in extract_insn, at recog.c:2304 on ppc64le
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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Subject: [Bug driver/87056] [9 Regression] GCC does not work when using -pipe
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--- Comment #3 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
not able to reproduce, (both build using 7.3.0 and bootstrapping)
>From gcc-bugs-return-613426-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 14:41:39 2018
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From: "daniel.f.starke at freenet dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87015] [8/9 Regression] miscompilation of template heavy Boost Spirit code
Date: Wed, 22 Aug 2018 14:41:00 -0000
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--- Comment #4 from Daniel Starke <daniel.f.starke at freenet dot de> ---
Sure, but it will take some days as I am currently reducing a testcase for
another bug.
>From gcc-bugs-return-613427-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 15:12:52 2018
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From: "iii at linux dot ibm.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/80080] S390: Isses with emitted cs-instructions for __atomic builtins.
Date: Wed, 22 Aug 2018 15:12:00 -0000
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--- Comment #12 from Ilya Leoshkevich <iii at linux dot ibm.com> ---
I've investigated foo3, foo4 and foo5, and came to the following
conclusions:
When foo3 is compiled with -march=z10 or later, cprop1 pass propagates
global's SYMBOL_REF value into UNSPECV_CAS. On previous machines it
does not happen, because the result is rejected by insn_invalid_p ().
Then, reload realizes that SYMBOL_REF cannot be a legitimate UNSPECV_CAS
argument, and loads it into a pseudo right before. The net result is
that loading of SYMBOL_REF is moved from outside of the loop into the
loop. So we need to somehow inhibit constant propagation for this case.
Jump threading in foo4 does not work, because it's done only during
`jump' pass, at which point there are insns with side-effects in the
basic block of the 2nd jump. They are later deleted by the `combine'
pass, but we don't request CLEANUP_THREADING after that. I wonder if we
could introduce it?
In addition, when foo4 is compiled with -O2 or -O3, we don't use
conditional return, because our return sequence contains a PARALLEL,
which is rejected by bb_is_just_return (). This can also be improved.
Finally, in foo5 `cs' is generated by s390_expand_cs_tdsi (), and
comparison is generated by common expansion logic, so it doesn't look
possible to improve the situation solely in the back-end. We need to
somehow make gcc aware that (oldval == 0) and (retval != 0) are
equivalent after `cs', but I'm not sure at which point we could and
should do this - in theory doing this on tree rather than RTL level can
help other architectures.
>From gcc-bugs-return-613428-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 15:13:49 2018
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Subject: [Bug c/87060] New: Condition check is optimized out for volatile unsigned char / short
Date: Wed, 22 Aug 2018 15:13:00 -0000
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Bug ID: 87060
Summary: Condition check is optimized out for volatile unsigned
char / short
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
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Compilers from http://gcc.godbolt.org/ are used to reproduce the issue.
Compiler: x86-64 gcc (trunk); gcc (GCC-Explorer-Build) 9.0.0 20180821
(experimental)
Options: -Os
Test code:
```
volatile unsigned char u8;
void test_u8 (void)
{
if (u8 + 1) { u8 = 1; }
}
```
Disassembly:
```
test_u8:
mov al, BYTE PTR u8[rip]
mov BYTE PTR u8[rip], 1
ret
```
Condition check is optimized out, while unsigned overflow is perfectly
legitimate operation.
- also can be reproduced in gcc 8/7/6/5 and 4 (after 4.1.2)
- also with unsigned short type
>From gcc-bugs-return-613429-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 15:28:16 2018
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Subject: [Bug c/87060] Condition check is optimized out for volatile unsigned char / short
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--- Comment #1 from Yevheniy Soloshenko <yso at melexis dot com> ---
Ok, my fault. Integer promotion in action.
The code below is fine.
```
void test_u8 (void)
{
if ((unsigned char)(u8 + 1)) { u8 = 1; }
}
```
>From gcc-bugs-return-613430-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 15:52:32 2018
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Subject: [Bug target/86973] [6/7/8/9 Regression] ICE in expand_call, at calls.c:4217
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--- Comment #1 from Michael Matz <matz at gcc dot gnu.org> ---
I can reproduce the same error without any va-args:
% cat bug.i
extern void foo(void *);
__attribute__((sysv_abi))
void a(__attribute__((__vector_size__(8 * sizeof(double)))) double b){
foo(0);
}
% ./cc1 -mabi=ms -mavx512f pr86973.i
pr86973.i:4:5: internal compiler error: in expand_call, at calls.c:4218
4 | foo(0);
So, are you absolutely sure that r222173 (which delayed expansion of va_arg
until pass_stdarg) is the one that introduced this error? As far as I can
determine this is some interaction between backend and call setup going
wrong, which specifically is about a sysv_abi function (with large param)
calling a ms_abi function.
>From gcc-bugs-return-613431-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 16:01:14 2018
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Subject: [Bug target/86973] [6/7/8/9 Regression] ICE in expand_call, at calls.c:4217
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work|5.4.0 |
Known to fail| |4.9.0, 5.4.0
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Michael Matz from comment #1)
> I can reproduce the same error without any va-args:
>
> % cat bug.i
> extern void foo(void *);
> __attribute__((sysv_abi))
> void a(__attribute__((__vector_size__(8 * sizeof(double)))) double b){
> foo(0);
> }
> % ./cc1 -mabi=ms -mavx512f pr86973.i
> pr86973.i:4:5: internal compiler error: in expand_call, at calls.c:4218
> 4 | foo(0);
>
> So, are you absolutely sure that r222173 (which delayed expansion of va_arg
> until pass_stdarg) is the one that introduced this error? As far as I can
> determine this is some interaction between backend and call setup going
> wrong, which specifically is about a sysv_abi function (with large param)
> calling a ms_abi function.
Yes, I can confirm this test-case is as old as GCC 4.9.0 where the AVX512
extension was added.
>From gcc-bugs-return-613432-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 16:03:10 2018
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From: "tromey at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug jit/87003] use nonnull attribute in libgccjit.h
Date: Wed, 22 Aug 2018 16:03:00 -0000
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--- Comment #2 from Tom Tromey <tromey at gcc dot gnu.org> ---
I don't really know the best thing to do.
I see your point about graceful failure being a useful
feature, in cases where the result of some gcc-jit function
is passed as an argument to another one.
Maybe there are some arguments that truly cannot be NULL?
If any exist I think it would be fine to mark them as nonnull
and have the implementation simply assert. Perhaps there
aren't many of these though.
Another thing that would be useful would be a section in the
manual explaining the null-handling approach. I see there
is some text about this but perhaps it could be made more
prominent, like having a whole section just dedicated to this
topic?
>From gcc-bugs-return-613433-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 16:03:22 2018
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
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--- Comment #2 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
I can't reproduce with a cross to powerpc64le-linux.
I'm trying this:
void d(void);
char *a, *b;
void c(void) {
if (b == a)
return;
if (__builtin_strncmp(a, "", b - a))
d();
}
I also tried using x86-64 linux headers, which I assume are sufficiently
similar:
typedef long unsigned int size_t;
extern int strncmp (const char *__s1, const char *__s2, size_t __n)
__attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__pure__))
__attribute__ ((__nonnull__ (1, 2)));
etc
etc
Could someone provide a preprocessed source just in case my definitions above
are wrong?
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Subject: [Bug rtl-optimization/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
Date: Wed, 22 Aug 2018 16:04:00 -0000
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--- Comment #21 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Wed Aug 22 16:04:09 2018
New Revision: 263780
URL: https://gcc.gnu.org/viewcvs?rev=263780&root=gcc&view=rev
Log:
[ fix changelog ]
2018-08-22 Segher Boessenkool <segher@kernel.crashing.org>
PR rtl-optimization/86771
* combine.c (try_combine): Do not allow splitting a resulting PARALLEL
of two SETs into those two SETs, one to be placed at i2, if that SETs
destination is modified between i2 and i3.
Modified:
trunk/gcc/ChangeLog
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Subject: [Bug c/86983] documentation inconsistent with always_inline diagnostics for computed goto
Date: Wed, 22 Aug 2018 16:32:00 -0000
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
--- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
We are doing it wrong, both on documentation and implementation sides.
What matters is taking the address of a label. Looking through goto argument
like the quoted code does is poor logic: as inlining can remap normal labels,
it should be equally able to remap address-taken labels.
In other words: decisions whether some BB or function may be duplicated should
be driven by whether they have address-taken labels, not indirect gotos.
We are inconsistent in whether labels are similar to automatic variables or
function-scope static variables. The documentation explains them mostly as if
they are similar to automatic variables, but then it allows using their
addresses in constant expression context, for which they act similar to static
variables.
We should make the distinction between 'auto' and 'static' labels clear both in
documentation and implementation.
What I suggest is to make labels fully auto-like, implying their addresses are
not constant expressions. Auto labels can be safely remapped during inlining.
For static labels we could require declaring them with 'static __label', and to
keep backwards compatibility also deduce that a label should be static if its
address needs to be usable in a constant expression.
PR 80053 gives an example where we miscompile due to a similar confusion.
Does my proposed way forward make sense?
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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/87030] GCC fails to build with Xcode 10, attempting an impossible multilib build
Date: Wed, 22 Aug 2018 16:32:00 -0000
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Iain Sandoe <iains at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |iains at gcc dot gnu.org
--- Comment #1 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Francois-Xavier Coudert from comment #0)
> Building with Xcode 10 (beta) on macOS 10.13 or 10.14 (beta), leads to a
> build failure because by default, configure sets GCC up for a multilib
> build. However, starting with Xcode 10, Apple has removed support for
> 32-bit: thus, the builds fails when trying to link libgcc, because it does
> not find the 32-bit system libc.
>
> Passing --disable-multilib fixes bootstrap. However, the default configure
> should detect that 32-bit is not supported and automatically build without
> 32-bit multilib.
Agreed; I was kinda expecting this - do you have a patch?
( or I can add it to the TODO ;) )
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Subject: [Bug middle-end/87052] STRING_CST printing incomplete in Gimple dumps
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Status|RESOLVED |ASSIGNED
Resolution|FIXED |---
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch committed in r263781.
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Wed Aug 22 16:42:56 2018
New Revision: 263781
URL: https://gcc.gnu.org/viewcvs?rev=263781&root=gcc&view=rev
Log:
PR middle-end/87052 - STRING_CST printing incomplete in Gimple dumps
gcc/testsuite/ChangeLog:
PR middle-end/87052
* gcc.dg/pr87052.c: New test.
* gcc.dg/tree-ssa/dump-3.c: Adjust.
gcc/ChangeLog:
PR middle-end/87052
* tree-pretty-print.c (pretty_print_string): Add argument.
(dump_generic_node): Call to pretty_print_string with string size.
Added:
trunk/gcc/testsuite/gcc.dg/pr87052.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/tree-ssa/dump-3.c
trunk/gcc/tree-pretty-print.c
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Subject: [Bug middle-end/87052] STRING_CST printing incomplete in Gimple dumps
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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Status|RESOLVED |ASSIGNED
Resolution|FIXED |---
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch committed in r263781.
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Wed Aug 22 16:42:56 2018
New Revision: 263781
URL: https://gcc.gnu.org/viewcvs?rev=263781&root=gcc&view=rev
Log:
PR middle-end/87052 - STRING_CST printing incomplete in Gimple dumps
gcc/testsuite/ChangeLog:
PR middle-end/87052
* gcc.dg/pr87052.c: New test.
* gcc.dg/tree-ssa/dump-3.c: Adjust.
gcc/ChangeLog:
PR middle-end/87052
* tree-pretty-print.c (pretty_print_string): Add argument.
(dump_generic_node): Call to pretty_print_string with string size.
Added:
trunk/gcc/testsuite/gcc.dg/pr87052.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/tree-ssa/dump-3.c
trunk/gcc/tree-pretty-print.c
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Subject: [Bug jit/64949] jit linking fails when building with in-tree libraries (mpc etc...)
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qinzhao at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
CC| |qinzhao at gcc dot gnu.org
--- Comment #1 from qinzhao at gcc dot gnu.org ---
GCC7, 8, and 9 all have the same issue as my latest experiments.
Will a fix to this issue be available soon?
>From gcc-bugs-return-613440-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 17:09:15 2018
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From: "matz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86973] [6/7/8/9 Regression] ICE in expand_call, at calls.c:4217
Date: Wed, 22 Aug 2018 17:09:00 -0000
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--- Comment #3 from Michael Matz <matz at gcc dot gnu.org> ---
A testcase that doesn't need -mabi cmdline args:
extern __attribute__((ms_abi)) void foo(void);
__attribute__((sysv_abi))
void a(__attribute__((__vector_size__(8 * sizeof(double)))) double b){
foo();
}
For very old GCCs (starting with r206947 from 2014) we actually get a sorry,
and
then the known ICE:
pr86973.i: In function ‘a’:
pr86973.i:4:8: sorry, unimplemented: ms_abi attribute requires
-maccumulate-outgoing-args or subtarget optimization implying it
foo();
^
pr86973.i:4:8: internal compiler error: in expand_call, at calls.c:3471
0x6ed0b1 expand_call(tree_node*, rtx_def*, int)
../../gcc/gcc/calls.c:3469
Indeed adding -maccumulate-outgoing-args removes the error. That revision
simply changed the default for that option.
We lost the sorry with r207677, but retained the ICE. Since then we ICE.
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Subject: [Bug fortran/86888] [F08] allocatable components of indirectly recursive type
Date: Wed, 22 Aug 2018 17:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86888
--- Comment #2 from janus at gcc dot gnu.org ---
Author: janus
Date: Wed Aug 22 17:10:00 2018
New Revision: 263782
URL: https://gcc.gnu.org/viewcvs?rev=263782&root=gcc&view=rev
Log:
fix PR 86888
2018-08-22 Janus Weil <janus@gcc.gnu.org>
PR fortran/86888
* decl.c (gfc_match_data_decl): Allow allocatable components of
indirectly recursive type.
* resolve.c (resolve_component): Remove two errors messages ...
(resolve_fl_derived): ... and replace them by a new one.
2018-08-22 Janus Weil <janus@gcc.gnu.org>
PR fortran/86888
* gfortran.dg/alloc_comp_basics_6.f90: Update an error message and add
an additional case.
* gfortran.dg/alloc_comp_basics_7.f90: New test case.
* gfortran.dg/class_17.f03: Update error message.
* gfortran.dg/class_55.f90: Ditto.
* gfortran.dg/dtio_11.f90: Update error messages.
* gfortran.dg/implicit_actual.f90: Add an error message.
* gfortran.dg/typebound_proc_12.f90: Update error message.
Added:
trunk/gcc/testsuite/gfortran.dg/alloc_comp_basics_7.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/decl.c
trunk/gcc/fortran/resolve.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/alloc_comp_basics_6.f90
trunk/gcc/testsuite/gfortran.dg/class_17.f03
trunk/gcc/testsuite/gfortran.dg/class_55.f90
trunk/gcc/testsuite/gfortran.dg/dtio_11.f90
trunk/gcc/testsuite/gfortran.dg/implicit_actual.f90
trunk/gcc/testsuite/gfortran.dg/typebound_proc_12.f90
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Subject: [Bug libstdc++/87061] New: [9 Regression] regex cannot be compiled with -std=c++1z -D_GLIBCXX_USE_CXX11_ABI=0
Date: Wed, 22 Aug 2018 17:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87061
Bug ID: 87061
Summary: [9 Regression] regex cannot be compiled with
-std=c++1z -D_GLIBCXX_USE_CXX11_ABI=0
Product: gcc
Version: 9.0
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Using the regex header (like in the code snippet below) with the the options
"-std=c++1z -D_GLIBCXX_USE_CXX11_ABI=0" results in an error message.
This is a regression introduced between 2018-07-26 and 2018-08-17.
===================================
#include <regex>
===================================
In file included from /gcc-9/include/c++/9.0.0/string:52,
from /gcc-9/include/c++/9.0.0/bitset:47,
from /gcc-9/include/c++/9.0.0/regex:39,
from bug.cc:1:
/gcc-9/include/c++/9.0.0/bits/basic_string.h: In instantiation of 'class
std::basic_string<char, std::char_traits<char>,
std::pmr::polymorphic_allocator<char> >':
/gcc-9/include/c++/9.0.0/regex:77:41: required from here
/gcc-9/include/c++/9.0.0/bits/basic_string.h:3103:63: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<char>'
3103 | typedef typename _Alloc::template rebind<_CharT>::other
_CharT_alloc_type;
|
^~~~~~~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:3116:68: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<char>'
3116 | typedef __gnu_cxx::__normal_iterator<pointer, basic_string>
iterator;
|
^~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:3118:61: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<char>'
3118 |
const_iterator;
|
^~~~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:3119:53: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<char>'
3119 | typedef std::reverse_iterator<const_iterator>
const_reverse_iterator;
|
^~~~~~~~~~~~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:3120:52: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<char>'
3120 | typedef std::reverse_iterator<iterator> reverse_iterator;
| ^~~~~~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:5233:2: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<char>'
5233 | find(const _Tp& __svt, size_type __pos = 0) const
| ^~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:5311:2: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<char>'
5311 | rfind(const _Tp& __svt, size_type __pos = npos) const
| ^~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:5395:2: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<char>'
5395 | find_first_of(const _Tp& __svt, size_type __pos = 0) const
| ^~~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:5479:2: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<char>'
5479 | find_last_of(const _Tp& __svt, size_type __pos = npos) const
| ^~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:5560:2: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<char>'
5560 | find_first_not_of(const _Tp& __svt, size_type __pos = 0) const
| ^~~~~~~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:5642:2: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<char>'
5642 | find_last_not_of(const _Tp& __svt, size_type __pos = npos) const
| ^~~~~~~~~~~~~~~~
In file included from bug.cc:3:
/gcc-9/include/c++/9.0.0/regex:77:57: error: template argument 1 is invalid
77 | using smatch = match_results<string::const_iterator>;
| ^
In file included from /gcc-9/include/c++/9.0.0/string:52,
from /gcc-9/include/c++/9.0.0/bitset:47,
from /gcc-9/include/c++/9.0.0/regex:39,
from bug.cc:1:
/gcc-9/include/c++/9.0.0/bits/basic_string.h: In instantiation of 'class
std::basic_string<wchar_t, std::char_traits<wchar_t>,
std::pmr::polymorphic_allocator<wchar_t> >':
/gcc-9/include/c++/9.0.0/regex:80:42: required from here
/gcc-9/include/c++/9.0.0/bits/basic_string.h:3103:63: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<wchar_t>'
3103 | typedef typename _Alloc::template rebind<_CharT>::other
_CharT_alloc_type;
|
^~~~~~~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:3116:68: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<wchar_t>'
3116 | typedef __gnu_cxx::__normal_iterator<pointer, basic_string>
iterator;
|
^~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:3118:61: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<wchar_t>'
3118 |
const_iterator;
|
^~~~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:3119:53: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<wchar_t>'
3119 | typedef std::reverse_iterator<const_iterator>
const_reverse_iterator;
|
^~~~~~~~~~~~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:3120:52: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<wchar_t>'
3120 | typedef std::reverse_iterator<iterator> reverse_iterator;
| ^~~~~~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:5233:2: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<wchar_t>'
5233 | find(const _Tp& __svt, size_type __pos = 0) const
| ^~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:5311:2: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<wchar_t>'
5311 | rfind(const _Tp& __svt, size_type __pos = npos) const
| ^~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:5395:2: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<wchar_t>'
5395 | find_first_of(const _Tp& __svt, size_type __pos = 0) const
| ^~~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:5479:2: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<wchar_t>'
5479 | find_last_of(const _Tp& __svt, size_type __pos = npos) const
| ^~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:5560:2: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<wchar_t>'
5560 | find_first_not_of(const _Tp& __svt, size_type __pos = 0) const
| ^~~~~~~~~~~~~~~~~
/gcc-9/include/c++/9.0.0/bits/basic_string.h:5642:2: error: no class template
named 'rebind' in 'class std::pmr::polymorphic_allocator<wchar_t>'
5642 | find_last_not_of(const _Tp& __svt, size_type __pos = npos) const
| ^~~~~~~~~~~~~~~~
In file included from bug.cc:3:
/gcc-9/include/c++/9.0.0/regex:80:58: error: template argument 1 is invalid
80 | using wsmatch = match_results<wstring::const_iterator>;
| ^
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/39627] [meta-bug] Fortran 2008 support
Date: Wed, 22 Aug 2018 17:31:00 -0000
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Bug 39627 depends on bug 86888, which changed state.
Bug 86888 Summary: [F08] allocatable components of indirectly recursive type
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86888
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug fortran/86888] [F08] allocatable components of indirectly recursive type
Date: Wed, 22 Aug 2018 17:31:00 -0000
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janus at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #3 from janus at gcc dot gnu.org ---
Fixed on 9-trunk with r263782. Closing.
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Subject: [Bug fortran/86837] [8/9 Regression] Optimization breaks an unformatted read with implicit loop
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Assignee|unassigned at gcc dot gnu.org |tkoenig at gcc dot gnu.org
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |marxin at gcc dot gnu.org
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 44574
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44574&action=edit
pre-processed test-case
Here it is, however I can't reproduce that with a cross compiler on x86_64.
>From gcc-bugs-return-613447-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 17:40:26 2018
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From: "tromey at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87062] New: mis-optimized code with -O3 and std::pair
Date: Wed, 22 Aug 2018 17:40:00 -0000
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Bug ID: 87062
Summary: mis-optimized code with -O3 and std::pair
Product: gcc
Version: unknown
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I'm filing this on behalf of someone who posted this bug on reddit.
https://www.reddit.com/r/cpp/comments/99e1ri/interesting_gcc_optimizer_bug/
Copying text from there:
Looks like there is an interesting gcc optimizer bug in gcc 7+.
#include <utility>
std::pair<long, long> fret(long i) { return {i, i}; }
​
With -O2 gcc generates the expected:
mov rdx, rdi
mov rax, rdi
But with -O3 it generates:
mov QWORD PTR [rsp-24], rdi
movq xmm0, QWORD PTR [rsp-24]
punpcklqdq xmm0, xmm0
movaps XMMWORD PTR [rsp-24], xmm0
mov rax, QWORD PTR [rsp-24]
mov rdx, QWORD PTR [rsp-16]
https://godbolt.org/z/lXoaA4
>From gcc-bugs-return-613448-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 17:41:36 2018
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Subject: [Bug c++/87062] mis-optimized code with -O3 and std::pair
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--- Comment #1 from Tom Tromey <tromey at gcc dot gnu.org> ---
Analysis in the comments there puts the blame on -ftree-slp-vectorize
>From gcc-bugs-return-613449-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 17:42:16 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
Date: Wed, 22 Aug 2018 17:42:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-22
Known to work| |8.2.0
Ever confirmed|0 |1
Known to fail| |9.0
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Maybe it will help:
(gdb) p debug_tree(min)
<integer_cst 0x3fffaf0cc750 type <integer_type 0x3fffaf1a0150 ssizetype>
constant 1>
$4 = void
(gdb) p debug_tree(max)
<integer_cst 0x3fffaf0ccae0 type <integer_type 0x3fffaf1a0150 ssizetype>
constant -1>
$5 = void
(gdb) p cmp
$6 = 1
Please use e.g. gcc112 machine, one can reproduce that there.
>From gcc-bugs-return-613450-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 17:47:18 2018
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Subject: [Bug target/87047] [7/8/9 Regression] performance regression because of if-conversion
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--- Comment #5 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
... and avoiding the wrong branch fixes this bug without regressing pr78120.c
testcase:
--- a/gcc/ifcvt.c
+++ b/gcc/ifcvt.c
@@ -3413,7 +3413,7 @@ noce_process_if_block (struct noce_if_info *if_info)
&if_info->else_simple))
return false;
- if (else_bb == NULL)
+ if (0 && else_bb == NULL)
if_info->original_cost += then_cost;
else if (speed_p)
if_info->original_cost += MIN (then_cost, else_cost);
>From gcc-bugs-return-613451-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 17:48:58 2018
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Subject: [Bug target/87062] mis-optimized code with -O3 and std::pair
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |x86_64-linux-gnu
Component|c++ |target
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Tom Tromey from comment #1)
> Analysis in the comments there puts the blame on -ftree-slp-vectorize
Actually it is a cost model issue ...
>From gcc-bugs-return-613452-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 18:11:06 2018
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Subject: [Bug c/87060] Condition check is optimized out for volatile unsigned char / short
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Not a bug as unsigned char + 1 is promoted to int(u8) + 1
>From gcc-bugs-return-613453-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 18:39:21 2018
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From: "gerald at pfeifer dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug web/87050] Bump wwwdocs to html5
Date: Wed, 22 Aug 2018 18:39:00 -0000
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Gerald Pfeifer <gerald at pfeifer dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-22
CC| |gerald at pfeifer dot com
Assignee|unassigned at gcc dot gnu.org |gerald at pfeifer dot com
Ever confirmed|0 |1
--- Comment #3 from Gerald Pfeifer <gerald at pfeifer dot com> ---
Agreed, and I've started to work on this earlier this year.
There are a number of posts to gcc-patches@ with work in that direction;
as usual the devil is in the detail (such as <a name="..."> being replaced
by <... id="...">, alas with different restrictions).
Are you willing to help with the conversation of the HTML pages?
>From gcc-bugs-return-613454-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 18:43:56 2018
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From: "wandersys at aim dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87063] New: Const subobject with const assignment operator, but operator anyway deleted
Date: Wed, 22 Aug 2018 18:43:00 -0000
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Bug ID: 87063
Summary: Const subobject with const assignment operator, but
operator anyway deleted
Product: gcc
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Hello!
Here is an example:
class bar
{
public:
bar() {}
bar const & operator=(bar const &) const
{
return *this;
}
};
class foo
{
bar const v;
};
int main()
{
foo a;
a = foo();
}
Here are the relevant points of the standard:
------
7) A defaulted copy/move assignment operator for class X is defined as deleted
if X has:
(7.1) a variant member with a non-trivial corresponding assignment operator and
X is a union-like class, or
(7.2) a non-static data member of const non-class type (or array thereof), or
(7.3) a non-static data member of reference type, or
(7.4) a direct non-static data member of class type M (or array thereof) or a
direct base class M that cannot be copied/moved because overload resolution, as
applied to find M's corresponding assignment operator, results in an ambiguity
or a function that is deleted or inaccessible from the defaulted assignment
operator.
------
Thus, the operator can be `deleted` because of clause 7.4, which relies on
overload resolution rules. If we remove the const qualification from the
assignment operator, then this clause will be executed, since we cannot allow
assignment overloading for a constant object (in this way). Currently, by
adding the const-qualification of the operator, I hope to disable this rule
because overload resolution becomes possible. However, the compiler forbids me.
This code works fine in vc++ and clang, but not in gcc.
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Subject: [Bug libstdc++/87061] [9 Regression] regex cannot be compiled with -std=c++1z -D_GLIBCXX_USE_CXX11_ABI=0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87061
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-22
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Those std::pmr type aliases should only be defined for the new ABI, because the
old std::string doesn't support C++11 allocators.
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Subject: [Bug libstdc++/68222] _Safe_iterator provides operators the wrapped iterator can't actually support
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--- Comment #2 from François Dumont <fdumont at gcc dot gnu.org> ---
Author: fdumont
Date: Wed Aug 22 18:51:25 2018
New Revision: 263786
URL: https://gcc.gnu.org/viewcvs?rev=263786&root=gcc&view=rev
Log:
2018-08-22 François Dumont <fdumont@gcc.gnu.org>
PR libstdc++/68222
* include/debug/safe_iterator.h
(_Safe_iterator<_It, _Sq, _Cat>): Add category template parameter.
(_Safe_iterator<>::_Const_iterator): Remove.
(_Safe_iterator<>::_IsConstant): New.
(_Safe_iterator<>::_OtherIterator): New.
(_Safe_iterator<_It, _Sq, _Cat>::_Safe_iterator<_MutIte>(
const _Safe_iterator<_MutIte, _Sq, _Cat>&)): Add _IsConstant::__value
in
__gnu_cxx::__enable_if condition.
(_Safe_iterator<_It, _Sq, _Cat>::_M_get_distance_to): New.
(_Safe_iterator<_It, _Sq, _Cat>::_M_get_distance_from_begin): New.
(_Safe_iterator<_It, _Sq, _Cat>::_M_get_distance_to_end): New.
(_Safe_iterator<_It, _Sq, std::bidirectional_iterator_tag>): New.
(_Safe_iterator<_It, _Sq, _Cat>::operator--()): Move...
(_Safe_iterator<_It, _Sq, std::bidirectional_iterator_tag>
::operator--()): ...here.
(_Safe_iterator<_It, _Sq, _Cat>::operator--(int)): Move...
(_Safe_iterator<_It, _Sq, std::bidirectional_iterator_tag>
::operator--(int)): ...here.
(_Safe_iterator<_It, _Sq, _Cat>::_M_decrementable()): Move...
(_Safe_iterator<_It, _Sq, std::bidirectional_iterator_tag>
::_M_decrementable()): ...here.
(_Safe_iterator<_It, _Sq, std::random_access_iterator_tag>): New.
(_Safe_iterator<_It, _Sq, _Cat>::operator[](const difference_type&)):
Move...
(_Safe_iterator<_It, _Sq, std::random_access_iterator_tag>
::operator[](const difference_type&)): ...here.
(_Safe_iterator<_It, _Sq, _Cat>::operator+=(const difference_type&)):
Move...
(_Safe_iterator<_It, _Sq, std::random_access_iterator_tag>
::operator+=(const difference_type&)): ...here.
(_Safe_iterator<_It, _Sq, _Cat>::operator+(const difference_type&)):
Move...
(_Safe_iterator<_It, _Sq, std::random_access_iterator_tag>
::operator+(const difference_type&)): ...here.
(_Safe_iterator<_It, _Sq, _Cat>::operator-=(const difference_type&)):
Move...
(_Safe_iterator<_It, _Sq, std::random_access_iterator_tag>
::operator-=(const difference_type&)): ...here.
(_Safe_iterator<_It, _Sq, _Cat>::operator-(const difference_type&)):
Move...
(_Safe_iterator<_It, _Sq, std::random_access_iterator_tag>
::operator-(const difference_type&)): ...here.
(operator<(const _Safe_iterator<>&, const _Safe_iterator<>&)):
Constraint to random access iterators.
(operator<=(const _Safe_iterator<>&, const _Safe_iterator<>&)):
Likewise.
(operator>(const _Safe_iterator<>&, const _Safe_iterator<>&)):
Likewise.
(operator>=(const _Safe_iterator<>&, const _Safe_iterator<>&)):
Likewise.
(operator-(const _Safe_iterator<>&, const _Safe_iterator<>&)):
Likewise.
(operator+(const difference_type&, const _Safe_iterator<>&)): Likewise.
(__check_dereferenceable(const _Safe_iterator<>&)): Remove.
(__get_distance): Remove.
(__get_distance_from_begin): Remove.
(__get_distance_to_end): Remove.
(struct __is_safe_random_iterator<_Safe_iterator<>>): Remove partial
specialization.
(__base(const _Safe_iterator<>&, std::input_iterator_tag)): Remove.
(__base(const _Safe_iterator<>&, std::random_access_iterator_tag)):
Remove.
(__base(const _Safe_iterator<>&)): Constraint to random access
iterator.
* include/debug/safe_iterator.tcc
(_Safe_iterator<>::_M_get_distance_from_begin()): New.
(_Safe_iterator<>::_M_get_distance_to_end()): New.
(_Safe_iterator<>::_M_get_distance_to(const _Safe_iterator<>&)): New.
(_Safe_iterator<_It, _Seq, std::random_access_iterator_tag>
::_M_valid_range): New.
* include/debug/safe_local_iterator.h
(_Safe_local_iterator<>::_Const_local_iterator): Remove.
(_Safe_local_iterator<>::_IsConstant): New.
(_Safe_local_iterator<>::_OtherIterator): New.
(_Safe_local_iterator<_It, _Cont>::_Safe_local_iterator<_MutIte,
_Cont>(
const _Safe_local_iterator<_MutIte, _Seq>&)): Add _IsConstant::__value
in __gnu_cxx::__enable_if condition. If singular compare base iterator
with _MutIte rather than _It.
(_Safe_local_iterator<>::_S_constant): Make constexpr.
(_Safe_local_iterator<>::_M_get_distance_to): New.
(__check_dereferenceable(const _Safe_local_iterator<>&)): Remove.
(__get_distance(const _Safe_local_iterator<>&,
const _Safe_local_iterator<>&, std::input_iterator_tag)): Remove.
(__valid_range(const _Safe_local_iterator<>&,
const _Safe_local_iterator<>&)): New.
* include/debug/safe_local_iterator.tcc
(_Safe_local_iterator<>::_M_get_distance_to): New.
* include/debug/deque (std::__debug::deque<>): Add
::__gnu_debug::_Safe_iterator<> friend declaration.
* include/debug/forward_list (std::__debug::forward_list<>): Likewise.
* include/debug/list (std::__debug::list<>): Likewise.
* include/debug/map.h (std::__debug::map<>): Likewise.
* include/debug/multimap.h (std::__debug::multimap<>): Likewise.
* include/debug/set.h (std::__debug::set<>): Likewise.
* include/debug/multiset.h (std::__debug::multiset<>): Likewise.
* include/debug/string (std::__debug::basic_string<>): Likewise.
* include/debug/unordered_map (std::__debug::unordered_map<>): Likewise
and add ::__gnu_debug::_Safe_local_iterator<> friend declaration.
(std::__debug::unordered_multimap<>): Likewise.
* include/debug/unordered_set (std::__debug::unordered_set<>):
Likewise.
(std::__debug::unordered_multiset<>): Likewise.
* include/debug/formatter.h: Adapt.
* include/debug/helper_functions.h
(__gnu_debug::_Safe_local_iterator<>): Add declaration.
(__get_distance<_Ite>(_Ite, _Ite, std::random_access_iterator_tag):
Pass parameter by copy.
(__get_distance<_Ite>(_Ite, _Ite, std::input_iterator_tag): Likewise.
(__get_distance<_Ite>(_Ite, _Ite): Likewise.
(__valid_range_aux<_Integral>): Pass _Integral by copy.
(__valid_range<_InputIterator>): Pass _InputIterator by copy.
(__valid_range<>(const _Safe_iterator<>&,
const _Safe_iterator<>&, typename _Distance_traits<>::__type&)):
Declare.
(__valid_range(const _Safe_local_iterator<>&,
const _Safe_local_iterator<>&, typename _Distance_traits<>::__type&)):
Declare.
(__valid_range<>(const _Safe_iterator<>&, const _Safe_iterator<>&)):
Declare.
(__valid_range(const _Safe_local_iterator<>&, const
_Safe_local_iterator<>&)):
Declare.
(__can_advance): Adapt.
(struct __is_safe_random_iterator<>): Remove.
(struct _SIter_base<>): Remove.
* include/debug/functions.h: Include <bits/stl_iterator.h>.
(__check_dereferenceable): Remove.
(__foreign_iterator_aux4, __foreign_iterator_aux3): Adapt.
(__foreign_iterator_aux2, __foreign_iterator_aux): Adapt.
(__foreign_iterator): Adapt.
* include/debug/stl_iterator.h
(__is_safe_random_iterator<std::reverse_iterator<>>): Remove.
(__base(const std::reverse_iterator<_Safe_iterator<_It, _Sq>)):
Constraint for random access iterators.
(__niter_base): Adapt.
* testsuite/util/testsuite_containers.h:
Include <bits/boost_concept_check.h>.
(iterator_concept_checks<_It, _Mutable, _Category>): New.
(citerator<_Cont>::forward_members::forward_members()): Instantiate
latter for container iterator and const_iterator.
* testsuite/23_containers/list/68222_neg.cc: New.
* testsuite/23_containers/vector/cons/destructible_debug_neg.cc: Adapt
line number.
* testsuite/23_containers/unordered_set/debug/debug_functions.cc:
(test01): Remove.
* testsuite/23_containers/vector/debug/debug_functions.cc (test01):
Remove.
Added:
trunk/libstdc++-v3/testsuite/23_containers/list/68222_neg.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/debug/deque
trunk/libstdc++-v3/include/debug/formatter.h
trunk/libstdc++-v3/include/debug/forward_list
trunk/libstdc++-v3/include/debug/functions.h
trunk/libstdc++-v3/include/debug/helper_functions.h
trunk/libstdc++-v3/include/debug/list
trunk/libstdc++-v3/include/debug/map.h
trunk/libstdc++-v3/include/debug/multimap.h
trunk/libstdc++-v3/include/debug/multiset.h
trunk/libstdc++-v3/include/debug/safe_iterator.h
trunk/libstdc++-v3/include/debug/safe_iterator.tcc
trunk/libstdc++-v3/include/debug/safe_local_iterator.h
trunk/libstdc++-v3/include/debug/safe_local_iterator.tcc
trunk/libstdc++-v3/include/debug/set.h
trunk/libstdc++-v3/include/debug/stl_iterator.h
trunk/libstdc++-v3/include/debug/string
trunk/libstdc++-v3/include/debug/unordered_map
trunk/libstdc++-v3/include/debug/unordered_set
trunk/libstdc++-v3/include/debug/vector
trunk/libstdc++-v3/testsuite/23_containers/unordered_set/debug/debug_functions.cc
trunk/libstdc++-v3/testsuite/23_containers/vector/cons/destructible_debug_neg.cc
trunk/libstdc++-v3/testsuite/23_containers/vector/debug/debug_functions.cc
trunk/libstdc++-v3/testsuite/util/testsuite_containers.h
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Subject: [Bug c++/87057] in compilation error, gcc should note about deleted copy-constructor
Date: Wed, 22 Aug 2018 18:54:00 -0000
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Konstantin Kharlamov from comment #2)
> (In reply to Jonathan Wakely from comment #1)
> > That would require a lot of special-casing just for std::variant.
>
> Well, I think, in place of std::variant there could be any struct-wrapper;
If you have an example with a simple struct then please show it, maybe we can
improve that case. std::variant is hundreds of lines of complex
metaprogramming, not a struct-wrapper.
> > N.B. If you just write "return ret;" it will compile fine. In general
> > "return x;" is better than "return {x};" because it doesn't prevent NRVO.
>
> Thanks, I prefer the `{x}` to just `x` because in the latter I'm being
> explicit that the `x` is not the type I'm returning, but there's some other
> type that it's being wrapped to.
Which means you pessimize the code, because you force a copy, not an elidable
move.
> As far as such trivial optimizations concerned, I'd prefer to rely on the
> compiler figuring that out — in the end, that's why we don't write assembly,
> right? =)
If you write "return ret;" the compiler is allowed to move from the variable,
and is allowed to use the NVRO. It's not allowed to do that if you write
"return {ret};".
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Subject: [Bug libstdc++/68222] _Safe_iterator provides operators the wrapped iterator can't actually support
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François Dumont <fdumont at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #3 from François Dumont <fdumont at gcc dot gnu.org> ---
Now _Safe_iterator has the iterator category in its type and operators are
constraint depending on this category.
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Subject: [Bug c++/87057] in compilation error, gcc should note about deleted copy-constructor
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #4)
> (In reply to Konstantin Kharlamov from comment #2)
> > (In reply to Jonathan Wakely from comment #1)
> > > That would require a lot of special-casing just for std::variant.
> >
> > Well, I think, in place of std::variant there could be any struct-wrapper;
>
> If you have an example with a simple struct then please show it, maybe we
> can improve that case. std::variant is hundreds of lines of complex
> metaprogramming, not a struct-wrapper.
Given:
#include <memory>
struct PacketErr {
std::unique_ptr<char> failed_devices;
};
struct V
{
PacketErr p;
};
V deserialize() {
PacketErr ret;
return {ret};
}
GCC says:
s.cc: In function 'V deserialize()':
s.cc:14:14: error: use of deleted function 'PacketErr::PacketErr(const
PacketErr&)'
14 | return {ret};
| ^
s.cc:3:8: note: 'PacketErr::PacketErr(const PacketErr&)' is implicitly deleted
because the default definition would be ill-formed:
3 | struct PacketErr {
| ^~~~~~~~~
s.cc:3:8: error: use of deleted function 'std::unique_ptr<_Tp,
_Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = char; _Dp =
std::default_delete<char>]'
In file included from /home/jwakely/gcc/9/include/c++/9.0.0/memory:80,
from s.cc:1:
/home/jwakely/gcc/9/include/c++/9.0.0/bits/unique_ptr.h:394:7: note: declared
here
394 | unique_ptr(const unique_ptr&) = delete;
| ^~~~~~~~~~
This seems pretty damn good.
As I said, the problem is that std::variant consists of hundreds of lines of
complex metaprogramming. When a variant<X,Y> can't be constructed from Y& the
failure happens deep inside a nested template metaprogram. It's very difficult
for the compiler to guess what outcome you expected and to print an error
explaining why that didn't happen.
>
> > > N.B. If you just write "return ret;" it will compile fine. In general
> > > "return x;" is better than "return {x};" because it doesn't prevent NRVO.
> >
> > Thanks, I prefer the `{x}` to just `x` because in the latter I'm being
> > explicit that the `x` is not the type I'm returning, but there's some other
> > type that it's being wrapped to.
>
> Which means you pessimize the code, because you force a copy, not an
> elidable move.
>
> > As far as such trivial optimizations concerned, I'd prefer to rely on the
> > compiler figuring that out — in the end, that's why we don't write assembly,
> > right? =)
>
> If you write "return ret;" the compiler is allowed to move from the
> variable, and is allowed to use the NVRO. It's not allowed to do that if you
> write "return {ret};".
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Subject: [Bug fortran/86935] Bad locus in ASSOCIATE statement
Date: Wed, 22 Aug 2018 19:32:00 -0000
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--- Comment #2 from janus at gcc dot gnu.org ---
Author: janus
Date: Wed Aug 22 19:31:40 2018
New Revision: 263787
URL: https://gcc.gnu.org/viewcvs?rev=263787&root=gcc&view=rev
Log:
fix PR 86935
2018-08-22 Janus Weil <janus@gcc.gnu.org>
PR fortran/86935
* match.c (gfc_match_associate): Improve diagnostics for the ASSOCIATE
statement.
2018-08-22 Janus Weil <janus@gcc.gnu.org>
PR fortran/86935
* gfortran.dg/associate_3.f90: Update error message.
* gfortran.dg/associate_39.f90: New test case.
Added:
trunk/gcc/testsuite/gfortran.dg/associate_39.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/match.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/associate_3.f03
>From gcc-bugs-return-613461-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 19:37:09 2018
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Subject: [Bug debug/79342] [6 Regression] ICE in output_index_string, at dwarf2out.c:25635 with -gsplit-dwarf
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--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
A patch is posted at
https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01389.html
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Subject: [Bug fortran/86935] Bad locus in ASSOCIATE statement
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janus at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #3 from janus at gcc dot gnu.org ---
Fixed on 9-trunk with r263787. Closing.
>From gcc-bugs-return-613463-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 20:03:46 2018
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Subject: [Bug gcov-profile/86957] gcc should warn about missing profiles for a compilation unit or a new function with -fprofile-use
Date: Wed, 22 Aug 2018 20:03:00 -0000
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--- Comment #3 from Indu Bhagat <ibhagatgnu at gmail dot com> ---
Currently, GCC dumps some information in the dump files regarding functions not
being executed in the training run (And, I agree its not satisfactorily
direct).
First, in the "Symbol table:" dump section in the .*i.profile dumpfile -
a. functions which are not executed in the training run (hence, zero count
profiles) are shown as "unlikely_executed". Thats the case when profiles
are not estimated.
b. If function profiles are estimated however (in -O1,
-fguess-branch-probability is enabled), an "estimated_locally"
appears alongside "unlikely_executed", e.g., ["Function flags: count: XXX
(estimated locally, globally 0) body unlikely_executed"].
I see deeper classification in profile_count::dump (FILE *f) const API (which
needs closer look), but I agree that we can improve the presented information
regarding the quality of the profile. Perhaps abstracting out the somewhat
superfluous information (in the current context), e.g., "globally 0" vs
"globally 0 adjusted"...
Why not additionally dump a clear "Profile Feedback" : "Run/Not run" per
function in the dump file ?
I need to take a closer look at the information being dumped currently before I
make a proposal. But I agree that gcc can give clearer information.
Will be happy to work on this as another CR.
>From gcc-bugs-return-613464-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 20:18:43 2018
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Subject: [Bug tree-optimization/87031] nios2 optimization for size - two cases of regression relatively to 5.3.0
Date: Wed, 22 Aug 2018 20:18:00 -0000
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--- Comment #4 from Michael_S <already5chosen at yahoo dot com> ---
It's fine that you moved the 2nd case to 'tree-optimization'. I suppose that's
where it belongs.
But I just saw the second case by chance in the process of reduction of the
first case to bare minimum. For me it (the second case) is not really
important.
What I care about is the first case.
Could you please mark it as 'target', so persons responsible for Nios2 back end
wouldn't overlook it?
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Subject: [Bug target/87021] New powerpc test cases from r263570 fail
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--- Comment #1 from Will Schmidt <willschm at gcc dot gnu.org> ---
These should clear up once the gimple-folding for vec_splat() code goes in.
If that patch is held up much longer (relatively), i will probably disable the
scan-assembler counts for those tests.
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Subject: [Bug tree-optimization/87031] nios2 optimization for size - two cases of regression relatively to 5.3.0
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--- Comment #5 from Michael_S <already5chosen at yahoo dot com> ---
It's fine that you moved the 2nd case to 'tree-optimization'. I suppose that's
where it belongs.
But I just saw the second case by chance in the process of reduction of the
first case to bare minimum. For me it (the second case) is not really
important.
What I care about is the first case.
Could you please mark it as 'target', so persons responsible for Nios2 back end
wouldn't overlook it?
>From gcc-bugs-return-613467-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 20:25:13 2018
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From: "Hi-Angel at yandex dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87057] in compilation error, gcc should note about deleted copy-constructor
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--- Comment #6 from Konstantin Kharlamov <Hi-Angel at yandex dot ru> ---
(In reply to Jonathan Wakely from comment #4)
> (In reply to Konstantin Kharlamov from comment #2)
> > As far as such trivial optimizations concerned, I'd prefer to rely on the
> > compiler figuring that out — in the end, that's why we don't write assembly,
> > right? =)
>
> If you write "return ret;" the compiler is allowed to move from the
> variable, and is allowed to use the NVRO. It's not allowed to do that if you
> write "return {ret};".
Hmm… But, isn't any optimization allowed that doesn't change semantic of the
program? And, at the very least, if a struct have no explicit copy- and move-
constructors, then replacing copy with a move wherever possible shouldn't go
noticed by the program.
(In reply to Jonathan Wakely from comment #5)
> (In reply to Jonathan Wakely from comment #4)
> > (In reply to Konstantin Kharlamov from comment #2)
> > > (In reply to Jonathan Wakely from comment #1)
> > > > That would require a lot of special-casing just for std::variant.
> > >
> > > Well, I think, in place of std::variant there could be any struct-wrapper;
> >
> > If you have an example with a simple struct then please show it, maybe we
> > can improve that case. std::variant is hundreds of lines of complex
> > metaprogramming, not a struct-wrapper.
>
> Given:
>
> #include <memory>
>
> struct PacketErr {
> std::unique_ptr<char> failed_devices;
> };
>
> struct V
> {
> PacketErr p;
> };
>
> V deserialize() {
> PacketErr ret;
> return {ret};
> }
>
> GCC says:
>
> s.cc: In function 'V deserialize()':
> s.cc:14:14: error: use of deleted function 'PacketErr::PacketErr(const
> PacketErr&)'
> 14 | return {ret};
> | ^
> s.cc:3:8: note: 'PacketErr::PacketErr(const PacketErr&)' is implicitly
> deleted because the default definition would be ill-formed:
> 3 | struct PacketErr {
> | ^~~~~~~~~
> s.cc:3:8: error: use of deleted function 'std::unique_ptr<_Tp,
> _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = char; _Dp =
> std::default_delete<char>]'
> In file included from /home/jwakely/gcc/9/include/c++/9.0.0/memory:80,
> from s.cc:1:
> /home/jwakely/gcc/9/include/c++/9.0.0/bits/unique_ptr.h:394:7: note:
> declared here
> 394 | unique_ptr(const unique_ptr&) = delete;
> | ^~~~~~~~~~
>
> This seems pretty damn good.
>
> As I said, the problem is that std::variant consists of hundreds of lines of
> complex metaprogramming. When a variant<X,Y> can't be constructed from Y&
> the failure happens deep inside a nested template metaprogram. It's very
> difficult for the compiler to guess what outcome you expected and to print
> an error explaining why that didn't happen.
Oh, hmm, indeed it does print that there's a copy-constructor missing. Oh well,
I think the bug can probably be closed as WONTFIX :)
>From gcc-bugs-return-613468-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 20:26:10 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/87064] New: [9 regression] libgomp.oacc-fortran/reduction-3.f90 fails starting with r263751
Date: Wed, 22 Aug 2018 20:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87064
Bug ID: 87064
Summary: [9 regression] libgomp.oacc-fortran/reduction-3.f90
fails starting with r263751
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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Note this fails on powerpc64 le but not be
# of expected passes 11
# of unexpected failures 1
FAIL: libgomp.oacc-fortran/reduction-3.f90 -DACC_DEVICE_TYPE_host=1
-DACC_MEM_SHARED=1 -O1 execution test
-================================-
bisectgcc: Tried [263705 - 263777]
bisectgcc: 263750 had no unexpected test case failures
bisectgcc: 263751 had unexpected test case failures
bisectgcc: make -k check-target-libgomp
RUNTESTFLAGS=fortran.exp=libgomp.oacc-fortran/reduction-3.f90
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-trunk/gcc/xgcc
-B/home/seurer/gcc/build/gcc-trunk/gcc/
/home/seurer/gcc/gcc-trunk/libgomp/testsuite/libgomp.oacc-fortran/reduction-3.f90
-B/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/
-B/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/.libs
-I/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp
-I/home/seurer/gcc/gcc-trunk/libgomp/testsuite/../../include
-I/home/seurer/gcc/gcc-trunk/libgomp/testsuite/.. -fmessage-length=0
-fno-diagnostics-show-caret -Wno-hsa -fdiagnostics-color=never -fopenacc
-B/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/../libquadmath/.libs/
-DACC_DEVICE_TYPE_host=1 -DACC_MEM_SHARED=1 -O1
-B/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/../libgfortran/.libs
-fintrinsic-modules-path=/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp
-L/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/.libs
-L/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/../libquadmath/.libs/
-L/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/../libgfortran/.libs
-lgfortran -foffload=-lgfortran -lm -o ./reduction-3.exe
PASS: libgomp.oacc-fortran/reduction-3.f90 -DACC_DEVICE_TYPE_host=1
-DACC_MEM_SHARED=1 -O1 (test for excess errors)
Setting LD_LIBRARY_PATH to
.:/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/.libs:/home/seurer/gcc/build/gcc-trunk/gcc:/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/../libgfortran/.libs:/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/../libquadmath/.libs:.:/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/.libs:/home/seurer/gcc/build/gcc-trunk/gcc:/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/../libgfortran/.libs:/home/seurer/gcc/build/gcc-trunk/powerpc64le-unknown-linux-gnu/./libgomp/../libquadmath/.libs:/home/seurer/gcc/build/gcc-trunk/./gmp/.libs:/home/seurer/gcc/build/gcc-trunk/./prev-gmp/.libs:/home/seurer/gcc/build/gcc-trunk/./mpfr/src/.libs:/home/seurer/gcc/build/gcc-trunk/./prev-mpfr/src/.libs:/home/seurer/gcc/build/gcc-trunk/./mpc/src/.libs:/home/seurer/gcc/build/gcc-trunk/./prev-mpc/src/.libs:/home/seurer/gcc/build/gcc-trunk/./isl/.libs:/home/seurer/gcc/build/gcc-trunk/./prev-isl/.libs:/home/seurer/gcc/install/gcc-7.2.0/lib64
Execution timeout is: 300
spawn [open ...]
STOP 11
FAIL: libgomp.oacc-fortran/reduction-3.f90 -DACC_DEVICE_TYPE_host=1
-DACC_MEM_SHARED=1 -O1 execution test
>From gcc-bugs-return-613469-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 20:42:04 2018
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Subject: [Bug c/87065] New: ice in trunc_int_for_mode
Date: Wed, 22 Aug 2018 20:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87065
Bug ID: 87065
Summary: ice in trunc_int_for_mode
Product: gcc
Version: 8.0
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Created attachment 44575
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44575&action=edit
C source code
The attached C code, when compiled by flags -c -w -O3 -march=native,
does this:
destDir/testFile.5246.c: In function ‘func_12’:
destDir/testFile.5246.c:1626:1: internal compiler error: in trunc_int_for_mode,
at explow.c:59
0x5baff7 trunc_int_for_mode(long, machine_mode)
../../trunk/gcc/explow.c:59
0x103a468 trunc_int_for_mode(poly_int<1u, long>, machine_mode)
../../trunk/gcc/explow.c:87
0xfd6258 gen_int_mode(poly_int<1u, long>, machine_mode)
../../trunk/gcc/emit-rtl.c:532
0x1fcc72b neg_const_int
../../trunk/gcc/simplify-rtx.c:69
/proc/cpuinfo says
model name : AMD FX(tm)-8350 Eight-Core Processor
I'll have my usual go at reducing the code and finding a range
of revisions where it went wrong.
>From gcc-bugs-return-613470-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 20:44:37 2018
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Subject: [Bug c/87065] ice in trunc_int_for_mode
Date: Wed, 22 Aug 2018 20:44:00 -0000
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--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
Reduced C code is this:
a, b, c, d, e;
f() {
short *g = b;
int h = 1;
for (; h <= 1; h++)
g = &c;
unsigned i;
for (; c; c++) {
for (; i <= 1; i++)
;
a ^= (a > 0 <= i) + ((e += d) == 0 ?: (*g = 8));
}
}
>From gcc-bugs-return-613471-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 20:46:20 2018
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Subject: [Bug c/87065] ice in trunc_int_for_mode
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--- Comment #2 from David Binderman <dcb314 at hotmail dot com> ---
It also seems to have been going wrong since sometime before
revision 262835.
>From gcc-bugs-return-613472-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 21:51:55 2018
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Subject: [Bug c++/87057] in compilation error, gcc should note about deleted copy-constructor
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |WONTFIX
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Closing then.
>From gcc-bugs-return-613473-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 22:14:30 2018
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From: "okannen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87066] New: new expression and potential destructor invokation
Date: Wed, 22 Aug 2018 22:14:00 -0000
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Bug ID: 87066
Summary: new expression and potential destructor invokation
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In the c++ standard [expr.new]:
>> if the new-expression creates an array of objects of class type, the destructor is potentially invoked.
And potentially invoked means that it is odr-used [basic.odr.def].
Gcc seems to apply this rule chaotically:
#include <string>
struct A
{
~A() = delete;
std::string s;
};
struct B
{
~B() = delete;
};
int main()
{
new A{}; //accepted
new B{}; //error: use of deleted function ~B()
//this is not a odr-use of ~B because this is not
//an array creation
new B; //accepted
new B[1]{}; //wrongly accepted: array creation odr-use the deleted
destructor
new B[1]; //wrongly accepted: array creation odr-use the deleted
}
>From gcc-bugs-return-613474-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 22:23:18 2018
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Subject: [Bug libstdc++/78448] Container max_size() functions don't consider the range of their difference_type
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78448
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Aug 22 22:22:40 2018
New Revision: 263789
URL: https://gcc.gnu.org/viewcvs?rev=263789&root=gcc&view=rev
Log:
PR libstdc++/78448 limit vector::max_size and deque::max_size
The container requirements imply that max_size() can't exceed the
maximum value of the container's difference_type. Enforce this for
std::vector and std::deque, and add checks to ensure the container
doesn't grow larger than that.
PR libstdc++/78448
* include/bits/deque.tcc (deque::_M_range_initialize): Use
_S_check_init_len to check size.
(deque::_M_push_back_aux, deque::_M_push_front_aux): Throw length
error if size would exceed max_size().
* include/bits/stl_deque.h (_Deque_base::size_type): Remove typedef.
(_Deque_base(_Deque_base&&, const allocator_type&, size_t)): Use
size_t instead of size_type.
(deq(size_type, const allocator_type&)
(deq(size_type, const value_type&, const allocator_type&)
(deque::_M_initialize_dispatch): Use _S_check_init_len to check size.
(deque::max_size): Call _S_max_size.
(deque::_S_check_init_len, deque::_S_max_size): New functions.
* include/bits/stl_vector.h (vector(size_type, const allocator_type&))
(vector(size_type, const value_type&, const allocator_type&))
(vector::_M_initialize_dispatch, vector::_M_range_initialize): Use
_S_check_init_len to check size.
(vector::max_size): Call _S_max_size.
(vector::_M_check_len): Prevent max from being expanded as a
function-like macro.
(vector::_S_check_init_len, vector::_S_max_size): New functions.
* include/bits/vector.tcc (vector::_M_assign_aux): Use
_S_check_init_len to check size.
* testsuite/23_containers/deque/capacity/max_size.cc: New test.
* testsuite/23_containers/vector/capacity/max_size.cc: New test.
Added:
trunk/libstdc++-v3/testsuite/23_containers/deque/capacity/max_size.cc
trunk/libstdc++-v3/testsuite/23_containers/vector/capacity/max_size.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/bits/deque.tcc
trunk/libstdc++-v3/include/bits/stl_deque.h
trunk/libstdc++-v3/include/bits/stl_vector.h
trunk/libstdc++-v3/include/bits/vector.tcc
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Subject: [Bug libstdc++/78448] Container max_size() functions don't consider the range of their difference_type
Date: Wed, 22 Aug 2018 22:25:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for std::vector and std::deque.
For the other containers the overhead of the nodes means that the allocator's
max_size will never be larger than ptrdiff_t anyway.
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/87061] [9 Regression] regex cannot be compiled with -std=c++1z -D_GLIBCXX_USE_CXX11_ABI=0
Date: Wed, 22 Aug 2018 22:54:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug c++/87066] new expression and potential destructor invokation
Date: Wed, 22 Aug 2018 22:54:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This looks related to PR 59238.
>From gcc-bugs-return-613478-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Aug 22 22:55:12 2018
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Subject: [Bug libstdc++/87061] [9 Regression] regex cannot be compiled with -std=c++1z -D_GLIBCXX_USE_CXX11_ABI=0
Date: Wed, 22 Aug 2018 22:55:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Aug 22 22:54:33 2018
New Revision: 263791
URL: https://gcc.gnu.org/viewcvs?rev=263791&root=gcc&view=rev
Log:
PR libstdc++/87061 remove pmr type aliases for COW strings
The pmr aliases for basic_string and match_results are incompatible with
the gcc4-compatible ABI because the Copy-On-Write basic_string class
doesn't support C++11 allocators.
PR libstdc++/87061
* include/experimental/regex [!_GLIBCXX_USE_CXX11_ABI]
(experimental::pmr::match_results, experimental::pmr::cmatch)
(experimental::pmr::smatch, experimental::pmr::wcmatch)
(experimental::pmr::wsmatch): Do not declare for gcc4-compatible ABI,
because COW strings don't support C++11 allocator model.
* include/experimental/string [!_GLIBCXX_USE_CXX11_ABI]
(experimental::pmr::basic_string, experimental::pmr::string)
(experimental::pmr::u16string, experimental::pmr::u32string)
(experimental::pmr::wstring): Likewise.
* include/std/regex [!_GLIBCXX_USE_CXX11_ABI] (pmr::match_results)
(pmr::cmatch, pmr::smatch, pmr::wcmatch, pmr::wsmatch): Likewise.
* include/std/string [!_GLIBCXX_USE_CXX11_ABI] (pmr::basic_string)
(pmr::string, pmr::u16string, pmr::u32string, pmr::wstring): Likewise.
* testsuite/21_strings/basic_string/types/pmr_typedefs.cc: Require
cxx11-abi.
* testsuite/28_regex/match_results/pmr_typedefs.cc: Likewise.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/experimental/regex
trunk/libstdc++-v3/include/experimental/string
trunk/libstdc++-v3/include/std/regex
trunk/libstdc++-v3/include/std/string
trunk/libstdc++-v3/testsuite/21_strings/basic_string/types/pmr_typedefs.cc
trunk/libstdc++-v3/testsuite/28_regex/match_results/pmr_typedefs.cc
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Subject: [Bug testsuite/77684] many tree-prof testsuite failures in parallel make check
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--- Comment #9 from Martin Sebor <msebor at gcc dot gnu.org> ---
Andi, we keep seeing intermittent failures in these tests. Can you help?
>From gcc-bugs-return-613480-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 03:01:37 2018
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From: "amker at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/87022] [8/9 Regression] miscompilation with -ftree-loop-distribution
Date: Thu, 23 Aug 2018 03:01:00 -0000
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bin cheng <amker at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-23
Ever confirmed|0 |1
--- Comment #3 from bin cheng <amker at gcc dot gnu.org> ---
This was first introduced enabling loop nest distribution. Reason is we
compute wrong dependence direction for two partitions. I suspect it kind of
relates with PR85804 which in essence a fusion issue, while this is
distribution. Will keep investigating.
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From: "kelledin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/87067] New: [8.1, 8.2] LTO-related ICE when running armv7 binutils test suite
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87067
Bug ID: 87067
Summary: [8.1, 8.2] LTO-related ICE when running armv7 binutils
test suite
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: kelledin at gmail dot com
CC: marxin at gcc dot gnu.org
Target Milestone: ---
I'm attempting to build gcc-8.2.0+binutils-2.31.1 native compiler for ARMv7,
and the binutils test-suite is noticing a LOT of test failures (63 to be
precise), mostly due to gcc ICEing during the link phase, i.e.:
gcc -B/usr/src/binutils-build/ld/tmpdir/ld/
-I/usr/src/binutils-2.31.1/ld/testsuite/ld-plugin -g -O2 -march=armv7-a
-mfpu=neon -mhard-float -c -g -O2 -march=armv7-a -mfpu=neon -flto
-fuse-linker-plugin -c /usr/src/binutils-2.31.1/ld/testsuite/ld-plugin/lto-1a.c
-o tmpdir/lto-1a.o
gcc -B/usr/src/binutils-build/ld/tmpdir/ld/
-I/usr/src/binutils-2.31.1/ld/testsuite/ld-plugin -g -O2 -march=armv7-a
-mfpu=neon -mhard-float -c -g -O2 -march=armv7-a -mfpu=neon -flto
-fuse-linker-plugin -c /usr/src/binutils-2.31.1/ld/testsuite/ld-plugin/lto-1b.c
-o tmpdir/lto-1b.o
gcc -B/usr/src/binutils-build/ld/tmpdir/ld/ -mhard-float -L/lib -L/usr/lib
-L/usr/local/lib -L/usr/arm-linux-gnueabihf/lib -o tmpdir/lto-1.exe
-L/usr/src/binutils-2.31.1/ld/testsuite/ld-plugin -O2 -flto -fuse-linker-plugin
tmpdir/lto-1a.o tmpdir/lto-1b.o
In function 'main':
lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
lto-wrapper: fatal error: gcc returned 1 exit status
compilation terminated.
The ICE errors seem to be related to LTO with -march optimizations: remove
either the -flto flag or the -march=armv7-a flag from the above commands, and
gcc succeeds. Removing any other flags doesn't seem to make a difference.
(For reference, similar failures happen with gcc-8.1.0+binutils-2.30. I had
hoped the newer toolchain versions might help, but no dice.)
The platform is a SolidRun MacchiatoBin (Marvell Armada 8040, Cortex-A72), but
running under a linux32 chroot (such that `uname -m`==armv8l) for building
32-bit software. FWIW I saw no such failures when bringing up a native AArch64
compiler (gcc 8.1.0+binutils 2.30). I can accept this is possibly a binutils
bug rather than a gcc bug--but even in that case, gcc should handle it a little
more gracefully than an ICE.
"gcc -v" says:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/arm-linux-gnueabihf/8.2.0/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: ../gcc-8.2.0/configure --prefix=/usr --libdir=/usr/lib
--enable-threads=posix --enable-__cxa_atexit --enable-languages=c,c++
--enable-install-libiberty --enable-multiarch --enable-multilib --enable-shared
--enable-static --disable-bootstrap --with-system-zlib --with-float=hard
--with-fpu=neon --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf
--build=arm-linux-gnueabihf
Thread model: posix
gcc version 8.2.0 (GCC)
I'm trying to build binutils with:
../binutils-2.31.1/configure --prefix=/usr
--libdir=/usr/lib/arm-linux-gnueabihf
--with-lib-path=/lib:/usr/lib:/usr/local/lib --enable-shared --enable-gold=yes
--enable-plugins --enable-threads --disable-werror --with-system-zlib
--host=arm-linux-gnueabihf --target=arm-linux-gnueabihf
--build=arm-linux-gnueabihf
I can post the ld.log if anyone wants it, but it's 111K even when compressed.
I figured it might be nicer to post specific failure reports.
>From gcc-bugs-return-613482-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 05:59:19 2018
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87066] new expression and potential destructor invokation
Date: Thu, 23 Aug 2018 05:59:00 -0000
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--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
I am not convinced that rejecting new B[1] is a good idea, you could also
change the standard to say that it is ok. The destructor is only useful here
if, for new B[2], the first B is constructed ok but the constructor of the
second throws an exception. If the constructor is noexcept, there is no need
for the destructor. And the last subobject of the aggregate does not need a
destructor, which for an array of size 1 means no destructor is needed.
>From gcc-bugs-return-613483-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 06:28:31 2018
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Subject: [Bug fortran/86863] [OOP][F2008] type-bound module procedure name not recognized
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--- Comment #3 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Thu Aug 23 06:27:54 2018
New Revision: 263799
URL: https://gcc.gnu.org/viewcvs?rev=263799&root=gcc&view=rev
Log:
2017-08-23 Paul Thomas <pault@gcc.gnu.org>
PR fortran/86863
* resolve.c (resolve_typebound_call): If the TBP is not marked
as a subroutine, check the specific symbol.
2017-08-23 Paul Thomas <pault@gcc.gnu.org>
PR fortran/86863
* gfortran.dg/submodule_32.f08: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/submodule_32.f08
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/resolve.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/87018] Boostrap problems on AIX
Date: Thu, 23 Aug 2018 07:26:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|bootstrap |target
Summary|[9 Regression] Boostrap |Boostrap problems on AIX
|failure on AIX |
--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
This would appear to have been a local configuration / user
error, because other people can still bootstrap AIX.
Apparently, AIX is not supported to the degree that a normal developer
can just work with it, see also
https://gcc.gnu.org/ml/fortran/2018-08/msg00097.html .
Removing regression marker and re-assigning to "target".
It is very hard to avoid breaking bootstrap on a platform
that does not have adequate support so that a normal developer
can not bootstrap gcc there in the first place.
>From gcc-bugs-return-613485-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 07:35:53 2018
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rsandifo at gcc dot gnu.org
>From gcc-bugs-return-613486-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 07:41:12 2018
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Subject: [Bug lto/87067] [8.1, 8.2] LTO-related ICE when running armv7 binutils test suite
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-08-23
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Can you please attach some small bunch of pre-processed source files (-E) that
can be used to reproduce that?
>From gcc-bugs-return-613487-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 07:43:36 2018
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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84353] [8/9 Regression] [graphite] ICE in set_codegen_error, at graphite-isl-ast-to-gimple.c:206
Date: Thu, 23 Aug 2018 07:43:00 -0000
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--- Comment #9 from Arseny Solokha <asolokha at gmx dot com> ---
(In reply to Richard Biener from comment #5)
> Getting more testcase for this is nice though.
int pl, ag;
void
g9 (unsigned __int128 zo, int ji)
{
if (ag == 0)
__builtin_abort ();
while (ag < 1)
++ag;
if (zo != ji)
for (pl = 0; pl < 2; ++pl)
{
}
__builtin_abort ();
}
% gcc-9.0.0-alpha20180819 -O2 -floop-parallelize-all -fno-tree-loop-im -w -c
vlwdxwlb.c
during GIMPLE pass: graphite
vlwdxwlb.c: In function 'g9':
vlwdxwlb.c:4:1: internal compiler error: in set_codegen_error, at
graphite-isl-ast-to-gimple.c:205
4 | g9 (unsigned __int128 zo, int ji)
| ^~
0x73843a translate_isl_ast_to_gimple::set_codegen_error()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/graphite-isl-ast-to-gimple.c:205
0x7384cb translate_isl_ast_to_gimple::set_codegen_error()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/tree.h:3243
0x7384cb
translate_isl_ast_to_gimple::gcc_expression_from_isl_expr_int(tree_node*,
isl_ast_expr*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/graphite-isl-ast-to-gimple.c:308
0x14ad73b translate_isl_ast_to_gimple::binary_op_to_tree(tree_node*,
isl_ast_expr*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/graphite-isl-ast-to-gimple.c:340
0x14ae044 translate_isl_ast_to_gimple::graphite_create_new_guard(edge_def*,
isl_ast_expr*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/graphite-isl-ast-to-gimple.c:873
0x14af5e7 translate_isl_ast_to_gimple::translate_isl_ast_node_if(loop*,
isl_ast_node*, edge_def*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/graphite-isl-ast-to-gimple.c:892
0x14af564 translate_isl_ast_to_gimple::translate_isl_ast_node_block(loop*,
isl_ast_node*, edge_def*, std::map<isl_id*, tree_node*, std::less<isl_id*>,
std::allocator<std::pair<isl_id* const, tree_node*> > >&)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/graphite-isl-ast-to-gimple.c:859
0x14af947 graphite_regenerate_ast_isl(scop*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/graphite-isl-ast-to-gimple.c:1505
0x14abc1c graphite_transform_loops()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/graphite.c:413
0x14ac020 graphite_transforms
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/graphite.c:475
0x14ac020 execute
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/graphite.c:552
(r263652)
>From gcc-bugs-return-613488-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 08:26:15 2018
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Subject: [Bug tree-optimization/87031] nios2 optimization for size - two cases of regression relatively to 5.3.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87031
--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 22 Aug 2018, already5chosen at yahoo dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87031
>
> --- Comment #5 from Michael_S <already5chosen at yahoo dot com> ---
> It's fine that you moved the 2nd case to 'tree-optimization'. I suppose that's
> where it belongs.
> But I just saw the second case by chance in the process of reduction of the
> first case to bare minimum. For me it (the second case) is not really
> important.
> What I care about is the first case.
> Could you please mark it as 'target', so persons responsible for Nios2 back end
> wouldn't overlook it?
We should split the issue - having multiple ones in one bug usually
doesn't help. So - can you open a separate one for the first issue?
>From gcc-bugs-return-613489-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 08:53:58 2018
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Subject: =?UTF-8?B?W0J1ZyB0YXJnZXQvODU5MTBdIGNvbmZpZy9hYXJjaDY0L2FhcmNoNjQuYzox?= =?UTF-8?B?NTY1MzoxMjogd2FybmluZzogZHVwbGljYXRlZCDigJhpZuKAmSBjb25kaXRp?= =?UTF-8?B?b24=?Date: Thu, 23 Aug 2018 08:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85910
--- Comment #2 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Author: rsandifo
Date: Thu Aug 23 08:51:38 2018
New Revision: 263803
URL: https://gcc.gnu.org/viewcvs?rev=263803&root=gcc&view=rev
Log:
Fix aarch64_evpc_tbl guard (PR 85910)
This patch fixes a typo in aarch64_expand_vec_perm_const_1 that I
introduced as part of the SVE changes. I don't know of any cases in
which it has any practical effect, since we'll eventually try to use
TBL as a variable permute instead. Having the code is still an
important part of defining the interface properly and so we shouldn't
simply drop it.
2018-08-23 Richard Sandiford <richard.sandiford@arm.com>
gcc/
PR target/85910
* config/aarch64/aarch64.c (aarch64_expand_vec_perm_const_1): Fix
aarch64_evpc_tbl guard.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/aarch64/aarch64.c
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Subject: [Bug target/87067] [8.1, 8.2] LTO-related ICE when running armv7 binutils test suite
Date: Thu, 23 Aug 2018 08:53:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |lto
Component|lto |target
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I suppose that with your compiler a simple
int main() {}
would exhibit the same issue when doing
gcc -c -flto -march=armv7-a t.c
gcc -o t t.o -flto
? That is, somehow target specific option handling wrecks things here.
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
Date: Thu, 23 Aug 2018 08:57:00 -0000
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Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |law at gcc dot gnu.org
--- Comment #5 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Confirmed on a stage1 compiler natively.
Breakpoint 2, extract_range_from_binary_expr_1 (vr=0x3fffffffb1f0,
code=MIN_EXPR, expr_type=0x3fffaf1a0150, vr0_=0x3fffffffb138,
vr1_=0x3fffffffb118) at /home/aldyh/src/gcc/gcc/tree-vrp.c:1600
(gdb) p vr0.dump()
[1, +INF]
$78 = void
(gdb) p debug_generic_stmt(vr0.max)
18446744073709551615
$80 = void
(gdb) p/x 18446744073709551615
$82 = 0xffffffffffffffff
(gdb) p sign
$81 = SIGNED
It looks like extract_range_from_binary_expr_1 is being passed a nonsensical
range. VR0 is suppsed to be SIGNED, but yet the range is:
[1, 0xffffffffffffffff]
If the range should be really [1, +INF], I would've expected it to be
[1, 0x7ffffff...]
Obviously MIN/MAX handling in VRP will get confused by this ;-). I'll
investigate.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/87065] [7/8/9 Regression] combine causes ICE in trunc_int_for_mode
Date: Thu, 23 Aug 2018 09:08:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-23
CC| |segher at gcc dot gnu.org
Known to work| |6.4.1
Target Milestone|--- |7.4
Summary|ice in trunc_int_for_mode |[7/8/9 Regression] combine
| |causes ICE in
| |trunc_int_for_mode
Ever confirmed|0 |1
Known to fail| |7.1.0, 7.3.1
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. We can simplify_binary_operation with
(gdb) p debug_rtx (op0)
(reg:V4SI 195)
$2 = void
(gdb) p debug_rtx (op1)
(const_int 1 [0x1])
(gdb) p code
$6 = MINUS
via
#8 0x0000000001bec108 in combine_simplify_rtx (x=0x7ffff6a65228,
op0_mode=E_V4SImode, in_dest=0, in_cond=0)
at /space/rguenther/src/gcc-sccvn/gcc/combine.c:5730
5730 temp = simplify_binary_operation (code, mode, XEXP (x, 0), XEXP
(x, 1));
(gdb) p debug_rtx (x)
(minus:V4SI (reg:V4SI 195)
(const_int 1 [0x1]))
...
#11 0x0000000001bee30e in combine_simplify_rtx (x=0x7ffff6a3dc40,
op0_mode=E_V4SImode, in_dest=0, in_cond=0)
at /space/rguenther/src/gcc-sccvn/gcc/combine.c:6367
6367 return simplify_if_then_else (x);
(gdb) p debug_rtx (x)
(if_then_else:V4SI (eq:V4SI (reg:V4SI 134 [ vect__6.22 ])
(reg:V4SI 169))
(minus:V4SI (reg:V4SI 195)
(eq:V4SI (reg:V4SI 134 [ vect__6.22 ])
(reg:V4SI 169)))
(reg:V4SI 196))
segher?
Use -O3 -march=bdver2
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Subject: [Bug testsuite/87064] [9 regression] libgomp.oacc-fortran/reduction-3.f90 fails starting with r263751
Date: Thu, 23 Aug 2018 09:09:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|other |testsuite
Target Milestone|--- |9.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
The testcase probably needs adjustment.
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Subject: [Bug libstdc++/87061] [9 Regression] regex cannot be compiled with -std=c++1z -D_GLIBCXX_USE_CXX11_ABI=0
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87062] mis-optimized code with -O3 and std::pair
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-23
Blocks| |53947
Ever confirmed|0 |1
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
A dup of PR84101 and others. The vectorizer has a hard time accounting for
ABI details of parameter passing and return value handling because those are
not reflected in GIMPLE. There's a patch posted that maybe handles this
case, but I don't see a RESULT_DECL in the IL so it might not:
fret (long int i)
{
struct pair D.7982;
<bb 2> [local count: 1073741825]:
MEM[(struct pair *)&D.7982] = i_2(D);
MEM[(struct pair *)&D.7982 + 8B] = i_2(D);
return D.7982;
}
that is, the vectorizer doesn't know D.7982 is forcefully allocated to
a rax/rdx register pair but thinks it is memory (it is memory in GIMPLE).
A heuristic besides the one in the posted patch would be to slightly
pessimize non-TREE_ADDRESSABLE sources/destinations for vectorization,
but if the ABI would return std::pair<long, long> in %xmm0 we'd lose.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/84101] [7/8/9 Regression] -O3 and -ftree-vectorize trying too hard for function returning trivial pair-of-uint64_t-structure
Date: Thu, 23 Aug 2018 09:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84101
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tromey at gcc dot gnu.org
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 87062 has been marked as a duplicate of this bug. ***
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Subject: [Bug target/87062] mis-optimized code with -O3 and std::pair
Date: Thu, 23 Aug 2018 09:23:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Actually quite exact dup.
*** This bug has been marked as a duplicate of bug 84101 ***
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/53947] [meta-bug] vectorizer missed-optimizations
Date: Thu, 23 Aug 2018 09:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
Bug 53947 depends on bug 87062, which changed state.
Bug 87062 Summary: mis-optimized code with -O3 and std::pair
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87062
What |Removed |Added
----------------------------------------------------------------------------
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>From gcc-bugs-return-613499-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 09:25:41 2018
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From: "jb at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug testsuite/87064] [9 regression] libgomp.oacc-fortran/reduction-3.f90 fails starting with r263751
Date: Thu, 23 Aug 2018 09:25:00 -0000
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--- Comment #2 from Janne Blomqvist <jb at gcc dot gnu.org> ---
I'm a bit confused, r263751 should only affect behavior wrt NaN's and possibly
signed zeroes, and AFAICS none of those are present in the testcase. Can you
print out the values of rv and vresult just before it stops?
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Subject: [Bug fortran/86837] [8/9 Regression] Optimization breaks an unformatted read with implicit loop
Date: Thu, 23 Aug 2018 09:27:00 -0000
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--- Comment #5 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
I have a patch.
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Subject: [Bug ipa/87024] [6/7/8 Regression] ICE in fold_stmt_1
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |9.0
Summary|[6/7/8/9 Regression] ICE in |[6/7/8 Regression] ICE in
|fold_stmt_1 |fold_stmt_1
Known to fail|9.0 |
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
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Subject: [Bug ipa/87024] [6/7/8 Regression] ICE in fold_stmt_1
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Aug 23 09:29:45 2018
New Revision: 263805
URL: https://gcc.gnu.org/viewcvs?rev=263805&root=gcc&view=rev
Log:
2018-08-23 Richard Biener <rguenther@suse.de>
PR middle-end/87024
* tree-inline.c (copy_bb): Drop unused __builtin_va_arg_pack_len
calls.
* gcc.dg/pr87024.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/pr87024.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-inline.c
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Subject: [Bug tree-optimization/86988] [7 Regression] ICE: tree check: expected integer_cst, have var_decl in get_len, at tree.h:5563
Date: Thu, 23 Aug 2018 09:35:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[7/9 Regression] ICE: tree |[7 Regression] ICE: tree
|check: expected |check: expected
|integer_cst, have var_decl |integer_cst, have var_decl
|in get_len, at tree.h:5563 |in get_len, at tree.h:5563
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
>From gcc-bugs-return-613504-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 09:41:01 2018
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Subject: [Bug target/86947] Erroneous code generated with O2 and O3 for PPC
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |INVALID
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Thanks. This is invalid:
unsigned short *_Pmsw (double * px)
{
volatile _Dconst *ps = (_Dconst *)(char *)px;
return (unsigned short *)&ps->_Word[3];
}
if (x < 0.0)
{
((*_Pmsw (&(x))) ^= ((unsigned short) 0x8000));
neg = 1;
}
else
neg = 0;
/* _Eps._Double = 1.0 */
/* aliasing issue here. Compiler uses old value of x */
if (x < _Eps._Double) {
the compiler can CSE the value of x across the *_Pmsw (&x) modification
because
1) the load from x via an lvalue of type unsigned short violates type
based aliasing rules
2) the store to x via an lvalue of type unsigned short changes the dynamic
type of x which in turn makes the later load of x violate type based
aliasing rules
You can use -fno-strict-aliasing to make your code work. You might think
that having the _Dconst union in scope makes your program conforming but
GCC does not implement this reading of the standard unless you use
-fno-strict-aliasing which is not the default when optimizing with -O2
or higher.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86951] arm speculation barrier incompatible with ARMv6 or earlier
Date: Thu, 23 Aug 2018 09:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86951
--- Comment #1 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Author: rearnsha
Date: Thu Aug 23 09:47:34 2018
New Revision: 263806
URL: https://gcc.gnu.org/viewcvs?rev=263806&root=gcc&view=rev
Log:
PR target/86951 arm - Handle speculation barriers on pre-armv7 CPUs
The AArch32 instruction sets prior to Armv7 do not define the ISB and
DSB instructions that are needed to form a speculation barrier. While
I do not know of any instances of cores based on those instruction
sets being vulnerable to speculative side channel attacks it is
possible to run code built for those ISAs on more recent hardware
where they would become vulnerable.
This patch works around this by using a library call added to libgcc.
That code can then take any platform-specific actions necessary to
ensure safety.
For the moment I've only handled two cases: the library code being
built for armv7 or later anyway and running on Linux.
On Linux we can handle this by calling the kernel function that will
flush a small amount of cache. Such a sequence ends with a ISB+DSB
sequence if running on an Armv7 or later CPU.
gcc:
PR target/86951
* config/arm/arm-protos.h (arm_emit_speculation_barrier): New
prototype.
* config/arm/arm.c (speculation_barrier_libfunc): New static
variable.
(arm_init_libfuncs): Initialize it.
(arm_emit_speculation_barrier): New function.
* config/arm/arm.md (speculation_barrier): Call
arm_emit_speculation_barrier for architectures that do not have
DSB or ISB.
(speculation_barrier_insn): Only match on Armv7 or later.
libgcc:
PR target/86951
* config/arm/lib1funcs.asm (speculation_barrier): New function.
* config/arm/t-arm (LIB1ASMFUNCS): Add it to list of functions
to build.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/arm/arm-protos.h
trunk/gcc/config/arm/arm.c
trunk/gcc/config/arm/arm.md
trunk/libgcc/ChangeLog
trunk/libgcc/config/arm/lib1funcs.S
trunk/libgcc/config/arm/t-arm
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
Date: Thu, 23 Aug 2018 09:53:00 -0000
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Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #6 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(tl;dr: strncmp code is creating a MIN_EXPR with incompatible types).
I think my patch exposed a latent bug.
Previously, the min/max code was calling int_const_binop() code, which in turns
calls wide_int_binop() with the type of the first argument:
int_const_binop():
...
tree type = TREE_TYPE (arg1);
...
if (TREE_CODE (arg1) == INTEGER_CST && TREE_CODE (arg2) == INTEGER_CST)
{
wide_int warg1 = wi::to_wide (arg1), res;
wide_int warg2 = wi::to_wide (arg2, TYPE_PRECISION (type));
success = wide_int_binop (res, code, warg1, warg2, sign, &overflow);
poly_res = res;
}
But in this particular case the MIN_EXPR that was passed to VRP, and
consequently int_const_binop() has incompatible argument types.
Placing a breakpoint on VRP around here:
else if (code == MIN_EXPR
|| code == MAX_EXPR)
One can see that the types of vr0.min, vr1.min, and the entire MIN_EXPR
(expr_type) are not entirely compatible:
(gdb) p debug_generic_stmt(vr0.min.typed.type)
sizetype
$33 = void
(gdb) p debug_generic_stmt(vr1.min.typed.type)
ssizetype
$34 = void
(gdb) p debug_generic_stmt(expr_type)
ssizetype
vr0.min is unsigned, but vr1.min and the MIN_EXPR are signed.
We can trace the MIN_EXPR to:
expand_builtin_strncmp():
/* If we are not using the given length, we must incorporate it here.
The actual new length parameter will be MIN(len,arg3) in this case. */
if (len != len3)
len = fold_build2_loc (loc, MIN_EXPR, TREE_TYPE (len), len, len3);
(gdb) p debug_generic_stmt(len)
MIN_EXPR <(sizetype) _4, 1>;
I could easily change the new VRP code to use the type of vr0 when calling
wide_int_binop, fixing the PR, and keeping to the previous functionality, but I
think the problem here is the incompatible MIN_EXPR.
Am I missing something, or should MIN_EXPR have compatible types?
Tagging Martin, since the MIN_EXPR code came from:
commit 5c5d012be3c48bfcd674e4ab9d8158b171cb0e58
Author: msebor <msebor@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed Dec 20 16:56:20 2017 +0000
PR testsuite/83131 - c-c++/common/attr-nonstring-3 failure for strcmp tests
on PowerPC
gcc/ChangeLog:
PR testsuite/83131
* builtins.c (expand_builtin_strlen): Use get_callee_fndecl.
(expand_builtin_strcmp): Call maybe_warn_nonstring_arg.
(expand_builtin_strncmp): Same.
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Subject: [Bug target/86772] [meta-bug] tracking port status for CVE-2017-5753
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Bug 86772 depends on bug 86951, which changed state.
Bug 86951 Summary: arm speculation barrier incompatible with ARMv6 or earlier
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86951
What |Removed |Added
----------------------------------------------------------------------------
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Subject: [Bug target/86951] arm speculation barrier incompatible with ARMv6 or earlier
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Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Fixed
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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87018] Boostrap problems on AIX
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--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Here is one way that works: (this is on gcc119):
Use bash as your shell.
export SHELL=/usr/bin/bash
export CONFIG_SHELL=/usr/bin/bash
export PATH=/opt/freeware/bin:$PATH
~/src/gcc/configure --disable-werror --enable-languages=c,c++ \
--with-gmp=/opt/cfarm --with-libiconv-prefix=/opt/cfarm \
--disable-libstdcxx-pch --disable-nls
(not sure if that --disable-werror is needed, or was only temporarily needed,
or what; but it works. No idea if that libiconv thing is needed either, there
is disable-nls after all. And the pch thing is just to make bootstrap a lot
faster).
Here is one I use on gcc111:
~/src/gcc/configure --prefix=$HOME/tot --enable-languages=c,c++,fortran \
--with-gmp=/opt/cfarm/gmp-latest --with-mpfr=/opt/cfarm/mpfr-latest \
--with-mpc=/opt/cfarm/mpc-latest --disable-nls --disable-libsanitizer
(and same env settings as on gcc119).
I don't know what you are doing that causes problems. The AIX systems are
annoyingly slow to experiment on, but they aren't harder at all to build on
than other less mainstream systems, in my experience. So please just
experiment, or ask for help when you get stuck. Good luck!
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Subject: [Bug driver/87056] [9 Regression] GCC does not work when using -pipe
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Assignee|unassigned at gcc dot gnu.org |nathan at gcc dot gnu.org
--- Comment #4 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Fixed r263807
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--- Comment #5 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Author: nathan
Date: Thu Aug 23 10:21:21 2018
New Revision: 263807
URL: https://gcc.gnu.org/viewcvs?rev=263807&root=gcc&view=rev
Log:
[libiberty patch] Fix PGO bootstrap
https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01386.html
PR driver/87056
* pex-unix.c (pex_unix_exec_child): Duplicate bad_fn into local
scopes to avoid potential clobber.
Modified:
trunk/libiberty/ChangeLog
trunk/libiberty/pex-unix.c
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From: "anon63 at protonmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87028] false positive -Wstringop-truncation strncpy with global variable source string
Date: Thu, 23 Aug 2018 10:42:00 -0000
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--- Comment #3 from anon63 <anon63 at protonmail dot com> ---
Dear Martin,
Thank you for the explanations.
Do you have any advice of what we should do before this eventual deferring of
the strncpy -> memcpy folding in a future gcc release ?
In particular, can you elaborate just a bit on what you said in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84474 :
"strncpy is being misused and strcpy (or other string functions if strcpy is
not acceptable) would be more appropriate"
I am searching for a strategic way of dealing with these false positive when
lots of codebases are going to be compiled by default with gcc-8. (as you know,
gcc 8 is the default on debian sid since end of July 2018 but people are coming
back from holidays now :) )
For example, here https://lkml.org/lkml/2018/2/17/198, a guy suggests to use
-Wno-stringop-truncation until gcc deals true/false positive correctly
or here
https://stackoverflow.com/questions/50198319/gcc-8-wstringop-truncation-what-is-the-good-practice
the pragma diagnostic solution, the manual strncmp->memcmp solution...
Best,
>From gcc-bugs-return-613513-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 10:50:28 2018
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Subject: [Bug rtl-optimization/87065] [7/8/9 Regression] combine causes ICE in trunc_int_for_mode
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |marxin at gcc dot gnu.org,
| |rsandifo at gcc dot gnu.org
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Btw. started with r224941.
>From gcc-bugs-return-613514-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 10:52:03 2018
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From: "luk32 at o2 dot pl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87068] New: No diagnostic on an ill-formed [[fallthrough]]
Date: Thu, 23 Aug 2018 10:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87068
Bug ID: 87068
Summary: No diagnostic on an ill-formed [[fallthrough]]
Product: gcc
Version: unknown
Status: UNCONFIRMED
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Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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gcc cleanly compiles an ill-formed [[fallthrough]] example from the standard,
producing no diagnostic. I believe it's a bug.
Problematic code:
// http://eel.is/c++draft/dcl.attr.fallthrough
void f(int n) {
void g(), h(), i();
switch (n) {
case 1:
case 2:
g();
[[fallthrough]];
case 3: // warning on fallthrough discouraged
h();
case 4: // implementation may warn on fallthrough
i();
[[fallthrough]]; // ill-formed
}
}
Live example https://godbolt.org/z/fftSM-
Credit:
https://stackoverflow.com/questions/51983560/should-there-be-a-diagnostic-from-from-gcc-for-this-ill-formed-c-code
>From gcc-bugs-return-613515-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 10:54:06 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/87069] New: gcov accumulates results for identical files
Date: Thu, 23 Aug 2018 10:54:00 -0000
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Bug ID: 87069
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It's probably issue when one provides one files twice on command line:
$ cat gcov.c
int foo()
{
return 0;
}
int main()
{
return foo();
}
$ gcov gcov.c gcov.c -t
-: 0:Source:gcov.c
-: 0:Programs:2
2: 1:int foo()
-: 2:{
2: 3: return 0;
-: 4:}
------------------
foo:
1: 1:int foo()
-: 2:{
1: 3: return 0;
-: 4:}
------------------
foo:
1: 1:int foo()
-: 2:{
1: 3: return 0;
-: 4:}
------------------
-: 5:
2: 6:int main()
-: 7:{
2: 8: return foo();
-: 9:}
>From gcc-bugs-return-613516-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 10:54:19 2018
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Subject: [Bug gcov-profile/87069] gcov accumulates results for identical files
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>From gcc-bugs-return-613517-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 10:57:17 2018
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Subject: [Bug gcov-profile/86957] gcc should warn about missing profiles for a compilation unit or a new function with -fprofile-use
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Agree that we should provide that information to user. Question is whether we
want to present it as a note (of a warning) or use new dump_printf_loc
machinery?
I can Indu help with that if needed?
>From gcc-bugs-return-613518-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 11:01:18 2018
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Subject: [Bug tree-optimization/87070] New: Combine popcount on pieces to a single popcountll
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Bug ID: 87070
Summary: Combine popcount on pieces to a single popcountll
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#include <bitset>
int f(unsigned long long x){ return std::bitset<64>(x).count(); }
should be a portable way to call a 64-bit popcount if it exists. Bug 63218
(bitset always uses long, never anything larger or smaller) sadly makes it
harder. The optimizer could compensate, but it doesn't, not in the "too small"
case (bug 83171), and not in the "too large" case, which is the topic of this
report. What I get with gcc on win64:
_13 = (long unsigned int) x_2(D);
_14 = x_2(D) >> 32;
_15 = (long unsigned int) _14;
_22 = __builtin_popcountl (_13);
_29 = __builtin_popcountl (_15);
_12 = (unsigned int) _22;
_3 = (unsigned int) _29;
_9 = _3 + _12;
_4 = (int) _9;
return _4;
This dump is from gcc-7, but testing
int f(unsigned long long x){
return __builtin_popcount(x)+__builtin_popcount(x>>32);
}
with trunk on linux shows it can't have changed much.
To be clear, this report is specifically about transforming the sum of popcount
on the 2 halves of a number into a single bigger popcount. A match.pd
transformation may be sufficient.
>From gcc-bugs-return-613519-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 11:27:11 2018
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Subject: [Bug c++/87068] No diagnostic on an ill-formed [[fallthrough]]
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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>From gcc-bugs-return-613520-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 11:31:20 2018
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Subject: [Bug rtl-optimization/87065] [7/8/9 Regression] combine causes ICE in trunc_int_for_mode
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--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-613521-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 11:47:55 2018
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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/87065] [7/8/9 Regression] combine causes ICE in trunc_int_for_mode
Date: Thu, 23 Aug 2018 11:47:00 -0000
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--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
So this is when trying
Trying 60, 63 -> 67:
60: r163:V4SI=r127:V4SI==r162:V4SI
REG_DEAD r127:V4SI
REG_EQUAL r127:V4SI==const_vector
63: r164:V4SI=r188:V4SI-r163:V4SI
67: r166:V4SI={(r163:V4SI)?r164:V4SI:r190:V4SI}
REG_DEAD r164:V4SI
REG_DEAD r163:V4SI
That looks fine as far as I see.
but, gdb on it:
(gdb) frame 6
#6 0x0000000000dbf196 in simplify_binary_operation(rtx_code, machine_mode,
rtx_def*, rtx_def*) () at /home/segher/src/gcc/gcc/simplify-rtx.c:2167
2167 tem = simplify_binary_operation_1 (code, mode, op0, op1, trueop0,
trueop1);
(gdb) p op0
$1 = (rtx) 0x7ffff04e6f30
(gdb) pr
(reg:V4SI 188)
(gdb) p op1
$2 = (rtx) 0x7ffff03254a0
(gdb) pr
(const_int 1 [0x1])
It is using the "==" as a const_int, while it should be a const_vector here?
>From gcc-bugs-return-613522-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 12:09:16 2018
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From: "virtuousfox at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/87071] New: libstdc++ crashes during GPU driver initialization with suspected attempt to execute unsupported instruction by Athlon64 X2 TK-57
Date: Thu, 23 Aug 2018 12:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87071
Bug ID: 87071
Summary: libstdc++ crashes during GPU driver initialization
with suspected attempt to execute unsupported
instruction by Athlon64 X2 TK-57
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: virtuousfox at gmail dot com
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Created attachment 44576
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44576&action=edit
Xorg.pid-1158.gdb.log
So I've updated the system on an old laptop after neglecting to do so for a
long time and was met with inoperable X server. After sending a report to Mesa
developers they insisted on that being an issue in libstdc++. Attached file
contains full gdb dump made by automated script and filled with relevant
debuginfo.
Affected libstdc++ version are 8.1.1 from
https://build.opensuse.org/package/show/openSUSE:Factory/gcc8 and 8.2.1 from
https://build.opensuse.org/package/show/devel:gcc/gcc8
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib64/gcc/x86_64-suse-linux/8/lto-wrapper
OFFLOAD_TARGET_NAMES=hsa:nvptx-none
Target: x86_64-suse-linux
Configured with: ../configure --prefix=/usr --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64
--enable-languages=c,c++,objc,fortran,obj-c++,ada,go
--enable-offload-targets=hsa,nvptx-none=/usr/nvptx-none, --without-cuda-driver
--enable-checking=release --disable-werror
--with-gxx-include-dir=/usr/include/c++/8 --enable-ssp --disable-libssp
--disable-libvtv --disable-cet --disable-libcc1 --enable-plugin
--with-bugurl=http://bugs.opensuse.org/ --with-pkgversion='SUSE Linux'
--with-slibdir=/lib64 --with-system-zlib --enable-__cxa_atexit
--enable-libstdcxx-allocator=new --disable-libstdcxx-pch
--enable-version-specific-runtime-libs --with-gcc-major-version-only
--enable-linker-build-id --enable-linux-futex --enable-gnu-indirect-function
--program-suffix=-8 --without-system-libunwind --enable-multilib
--with-arch-32=x86-64 --with-tune=generic --build=x86_64-suse-linux
--host=x86_64-suse-linux
Thread model: posix
gcc version 8.2.1 20180817 [gcc-8-branch revision 263612] (SUSE Linux)
cpuinfo from affected machine:
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 104
model name : AMD Athlon(tm) 64 X2 Dual-Core Processor TK-57
stepping : 2
cpu MHz : 800.000
cache size : 256 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm
3dnowext 3dnow rep_good nopl cpuid extd_apicid pni cx16 lahf_lm cmp_legacy svm
extapic cr8_legacy 3dnowprefetch vmmcall lbrv
bugs : apic_c1e fxsave_leak sysret_ss_attrs null_seg swapgs_fence
amd_e400 spectre_v1 spectre_v2
bogomips : 1596.01
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc 100mhzsteps
processor : 1
…
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
…
However, same versions run fine on machine with Radeon RX580 (radeonsi_dri) and
processor : 0
vendor_id : AuthenticAMD
cpu family : 21
model : 1
model name : AMD FX(tm)-6100 Six-Core Processor
stepping : 2
microcode : 0x600063e
cpu MHz : 3780.977
cache size : 2048 KB
physical id : 0
siblings : 6
core id : 0
cpu cores : 3
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb
rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf
pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 popcnt aes xsave avx lahf_lm
cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs
xop skinit wdt fma4 nodeid_msr topoext perfctr_core perfctr_nb cpb hw_pstate
ssbd ibpb vmmcall arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean
flushbyasid decodeassists pausefilter pfthreshold
bugs : fxsave_leak sysret_ss_attrs null_seg spectre_v1 spectre_v2
spec_store_bypass
bogomips : 7919.04
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate cpb
>From gcc-bugs-return-613523-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 12:10:57 2018
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Subject: [Bug libstdc++/87071] libstdc++ crashes during GPU driver initialization with suspected attempt to execute unsupported instruction by Athlon64 X2 TK-57
Date: Thu, 23 Aug 2018 12:10:00 -0000
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--- Comment #1 from Sergey Kondakov <virtuousfox at gmail dot com> ---
Created attachment 44577
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44577&action=edit
Asus_F3Ke.dmesg
Verbose dmesg from affected machine.
>From gcc-bugs-return-613524-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 12:35:52 2018
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Subject: [Bug libstdc++/87071] libstdc++ crashes during GPU driver initialization with suspected attempt to execute unsupported instruction by Athlon64 X2 TK-57
Date: Thu, 23 Aug 2018 12:35:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(EE) Illegal instruction at address 0x7ffff2f2c8ea
I don't see how this can possibly be a libstdc++ problem, since libstdc++
doesn't produce any CPU instructions, illegal or not.
As I already said to you, there's nothing we can do with this info.
>From gcc-bugs-return-613525-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 12:40:52 2018
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Subject: [Bug rtl-optimization/87026] [9 Regression] ICE in extract_constrain_insn_cached, at recog.c:2218
Date: Thu, 23 Aug 2018 12:40:00 -0000
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--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Thu Aug 23 12:40:14 2018
New Revision: 263810
URL: https://gcc.gnu.org/viewcvs?rev=263810&root=gcc&view=rev
Log:
Fix recent bug in canonicalize_comparison (PR87026)
The new code testing which way a comparison is best expressed creates
a pseudoregister (by hand) and creates some insns with that. Such
insns will no longer recog() when pseudo-registers are no longer
aloowed (after reload). But we have an ifcvt pass after reload (ce3).
This patch simply returns if we cannot create pseudos.
PR rtl-optimization/87026
* expmed.c (canonicalize_comparison): If we can no longer create
pseudoregisters, don't.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/expmed.c
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Subject: [Bug rtl-optimization/87026] [9 Regression] ICE in extract_constrain_insn_cached, at recog.c:2218
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug libstdc++/87071] libstdc++ crashes during GPU driver initialization with suspected attempt to execute unsupported instruction by Athlon64 X2 TK-57
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--- Comment #3 from Sergey Kondakov <virtuousfox at gmail dot com> ---
(In reply to Jonathan Wakely from comment #2)
> (EE) Illegal instruction at address 0x7ffff2f2c8ea
>
> I don't see how this can possibly be a libstdc++ problem, since libstdc++
> doesn't produce any CPU instructions, illegal or not.
>
> As I already said to you, there's nothing we can do with this info.
And Mesa devs said that it is. So everyone points fingers at each other in a
circle and what am I supposed to do ?
Program received signal SIGILL, Illegal instruction.
0x00007ffff2f2c8ea in _GLOBAL__sub_I_lower_x86.cpp () at
/usr/bin/../lib64/gcc/x86_64-suse-linux/8/../../../../include/c++/8/bits/char_traits.h:350
350 return static_cast<char_type*>(__builtin_memcpy(__s1, __s2,
__n));
#0 0x00007ffff2f2c8ea in _GLOBAL__sub_I_lower_x86.cpp () at
/usr/bin/../lib64/gcc/x86_64-suse-linux/8/../../../../include/c++/8/bits/char_traits.h:350
InitializeLowerX86PassFlag = {_M_once = 0}
SwrJit::intrinsicMap2[abi:cxx11] = {std::map with 0 elements, std::map
with 0 elements, std::map with 0 elements}
std::__ioinit = {static _S_refcount = 13, static _S_synced_with_stdio =
true}
SwrJit::DOUBLE = <optimized out>
std::piecewise_construct = <optimized out>
(anonymous namespace)::ForceMCJITLinking = <optimized out>
SwrJit::intrinsicMap[abi:cxx11] = std::map with 0 elements
SwrJit::LowerX86::ID = 0 '\000'
Is include/c++/8/bits/char_traits.h not part of libstdc++ ?
If your code is correct then whose isn't ?
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Subject: [Bug rtl-optimization/86771] [9 Regression] gfortran.dg/actual_array_constructor_1.f90 fails on arm after combine 2 insns to 2 insns patch
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #22 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Fixed on trunk; I'll backport it to 8 next week.
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Subject: [Bug libstdc++/87071] libstdc++ crashes during GPU driver initialization with suspected attempt to execute unsupported instruction by Athlon64 X2 TK-57
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--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Sergey Kondakov from comment #3)
> If your code is correct then whose isn't ?
Instructions are generated by the compiler. So, it is the compiler's fault, it
probably emits a SSE instruction that your processor doesn't understand.
That said, at least we need a runtime testcase that fails on your target. If
this is not possible, then please at least decompile the library and show the
instruction that fails. We also need preprocessed source and exact
instructions, how to build the source, so the illegal insn will be generated.
Also, please read https://gcc.gnu.org/bugs/
>From gcc-bugs-return-613530-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 13:04:57 2018
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Subject: [Bug c++/87068] No diagnostic on an ill-formed [[fallthrough]]
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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Subject: [Bug libstdc++/87071] libstdc++ crashes during GPU driver initialization with suspected attempt to execute unsupported instruction by Athlon64 X2 TK-57
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Uroš Bizjak from comment #4)
> (In reply to Sergey Kondakov from comment #3)
>
> > If your code is correct then whose isn't ?
> Instructions are generated by the compiler. So, it is the compiler's fault,
> it probably emits a SSE instruction that your processor doesn't understand.
Right. As you can see in GDB, the libstdc++ code says:
350 return static_cast<char_type*>(__builtin_memcpy(__s1, __s2,
__n));
Do you see any processor instructions there? Anything that isn't valid on your
CPU? No, because it's just C++ code.
> Also, please read https://gcc.gnu.org/bugs/
I already said that before the bug was even filed.
>From gcc-bugs-return-613532-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 13:16:07 2018
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Subject: [Bug c++/87072] New: g++6.2.0 false warning: array subscript is above array bounds, with misleading line number
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Bug ID: 87072
Summary: g++6.2.0 false warning: array subscript is above array
bounds, with misleading line number
Product: gcc
Version: 6.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Created attachment 44578
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44578&action=edit
C++ code fragment to reproduce the false warning
The code attached below gives a false warning:
fit.cxx: In member function ‘void Fit::NewtonStep()’:
fit.cxx:7:53: warning: array subscript is above array bounds [-Warray-bounds]
inline void AddToPar(unsigned i,double x) { par[i]+=x; }
when compiled with: g++ -Wall -O3 -c
The warning disappears when commenting out line 11, which contains completely
unrelated code. It also disappears when commenting out line 28, where the
inline code from line 7 actually is expanded. The warning is also absent when
compiling with a reduced level of optimisation.
output of g++ -v
=================
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/cvmfs/atlas.cern.ch/repo/ATLASLocalRootBase/x86_64/Gcc/gcc620_x86_64_slc6/6.2.0/x86_64-slc6/bin/../libexec/gcc/x86_64-pc-linux-gnu/6.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-6.2.0/configure
--prefix=/build/pmendez-sftnight/install-620local -with-system-zlib
--disable-multilib --enable-languages=all
Thread model: posix
gcc version 6.2.0 (GCC)
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Subject: [Bug middle-end/63155] [6/7/8/9 Regression] memory hog
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--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 44579
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44579&action=edit
alternate testcase
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Subject: [Bug middle-end/87054] misaligned asm output is turned into dereferenced pointer-to-aligned
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Created attachment 44580
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44580&action=edit
tested patch
Yeah, sorry, I mangled the patch a bit while simplifying it.
I've tested your patch, and combined it with a corrected testcase, into the
attached file, that I regstrapped on x86_64-linux-gnu.
Want me to post it, or will you?
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From: "vlad.lazar at arm dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/86995] [9 regression] c-c++-common/torture/builtin-arith-overflow-17.c etc. FAIL
Date: Thu, 23 Aug 2018 13:37:00 -0000
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Vlad Lazar <vlad.lazar at arm dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |vlad.lazar at arm dot com
--- Comment #2 from Vlad Lazar <vlad.lazar at arm dot com> ---
On x86 this was caused by the cost model and has been fixed in r263652.
However, upon further inspection, it surfaced that wi::add does not detect
underflow for unsigned operations. I am currently testing a patch which should
solve the issue.
>From gcc-bugs-return-613536-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 13:46:37 2018
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Subject: [Bug c/85433] -fdiagnostics-color=auto doesn't work properly with LTO
Date: Thu, 23 Aug 2018 13:46:00 -0000
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Jan Hubicka <hubicka at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
We use files for tlink use which IMO is never executed when we do plugin
enabled LTO link. I think we can just disable creation of those files for
use_plugin path.
>From gcc-bugs-return-613537-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 13:49:00 2018
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Subject: [Bug libstdc++/87071] libstdc++ crashes during GPU driver initialization with suspected attempt to execute unsupported instruction by Athlon64 X2 TK-57
Date: Thu, 23 Aug 2018 13:48:00 -0000
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
--- Comment #6 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
In your gdb script, please add
x/i $pc
disas
after the backtrace command (probably 'bt full') and regenerate the log.
Without that the log doesn't actually show the "illegal" instruction.
Also please show output of rpm -qf /usr/lib64/dri/r300_dri.so
>From gcc-bugs-return-613538-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 13:50:40 2018
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Subject: [Bug bootstrap/87013] Error: junk at end of line, first unrecognized character is `i'
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Attachment #44573|0 |1
is obsolete| |
--- Comment #5 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Created attachment 44581
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44581&action=edit
tested patch
This is a complete patch, with all the generated files, that I tested on
x86_64-linux-gnu, with an assembler that supports is_stmt. I've also manually
tested manually removing the #define HAVE_GAS_LOC_STMT in auto-host.h, and
checked that the compiler wouldn't output is_stmt directives. (It would still
emit negate_stmt opcodes when generating line number programs itself)
>From gcc-bugs-return-613539-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 13:51:50 2018
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Subject: [Bug bootstrap/87013] Error: junk at end of line, first unrecognized character is `i'
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--- Comment #6 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
I wanted to ask, martin, can you please confirm that it does indeed fix the
problem for you?
>From gcc-bugs-return-613540-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 14:12:37 2018
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Subject: [Bug bootstrap/84554] make check: FAIL: tversion: ERROR! The versions of gmp.h (5.0.5) and libgmp (4.3.1) do not match.
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matthew.hambley at metoffice dot gov.uk changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |matthew.hambley at metoffice dot g
| |ov.uk
--- Comment #1 from matthew.hambley at metoffice dot gov.uk ---
I see this too, with GCC 8.2.0.
tar -xf gcc-8.2.0.tar.xz
cd gcc-8.2.0
./contrib/download_prerequisites
cd ..
mkdir -p gcc-8.2.0-build
cd gcc-8.2.0-build
../gcc-8.2.0/configure --prefix=$package_dir/gcc/8.2.0
--enable-languages=c,c++,fortran,go --disable-multilib
make -j 16
It looks like it gets to stage 2 of the bootstrapping process, then it fails in
the MPFR self-test in the way described.
What seems to be happening is that it's correctly picking up gmp.h from the
in-source version but and old version of the library from /usr/lib64/libgmp.so.
>From gcc-bugs-return-613541-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 14:18:11 2018
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Subject: [Bug middle-end/87054] misaligned asm output is turned into dereferenced pointer-to-aligned
Date: Thu, 23 Aug 2018 14:18:00 -0000
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--- Comment #3 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 23 Aug 2018, aoliva at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87054
>
> Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> Status|NEW |ASSIGNED
> Assignee|unassigned at gcc dot gnu.org |aoliva at gcc dot gnu.org
>
> --- Comment #2 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
> Created attachment 44580
> --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44580&action=edit
> tested patch
>
> Yeah, sorry, I mangled the patch a bit while simplifying it.
>
> I've tested your patch, and combined it with a corrected testcase, into the
> attached file, that I regstrapped on x86_64-linux-gnu.
>
> Want me to post it, or will you?
Please go ahead - the patch is OK for trunk and branches after a while.
>From gcc-bugs-return-613542-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 15:01:16 2018
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Subject: [Bug libstdc++/83754] Segmentation fault in regex_search
Date: Thu, 23 Aug 2018 15:01:00 -0000
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Wendell Baker <wendellcraigbaker at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |wendellcraigbaker at gmail dot com
--- Comment #2 from Wendell Baker <wendellcraigbaker at gmail dot com> ---
Created attachment 44582
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44582&action=edit
test case using gcc compilation output
$ tar -avxf example.tar.gz
libstdc++_std_regex_executor/
libstdc++_std_regex_executor/.gitignore
libstdc++_std_regex_executor/Makefile
libstdc++_std_regex_executor/exhibit_grep
libstdc++_std_regex_executor/exhibit_perl
libstdc++_std_regex_executor/exhibit_sed
libstdc++_std_regex_executor/main.cpp
$ cd libstdc++_std_regex_executor/
$ make check
g++ -c -o main.o -std=c++1z main.cpp
g++ -o driver main.o
./driver
make: *** [Makefile:14: check] Segmentation fault (core dumped)
>From gcc-bugs-return-613544-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 15:16:56 2018
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Subject: [Bug c++/85875] -Weffc++ can't understand auto return values
Date: Thu, 23 Aug 2018 15:16:00 -0000
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programmer at posteo dot de changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |programmer at posteo dot de
--- Comment #1 from programmer at posteo dot de ---
Related: If the return type shall be used for SFINAE then GCC complains before
any instantiation takes place.
#include <type_traits>
template<class T> struct UseOps;
template<class T>
constexpr std::enable_if_t<
UseOps<T>{},
T&
> operator++(T&);
// warning: prefix 'constexpr std::enable_if_t<UseOps<T>{}, T&> operator++(T&)'
// should return 'T&' [-Weffc++]
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From: "seurer at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/87064] [9 regression] libgomp.oacc-fortran/reduction-3.f90 fails starting with r263751
Date: Thu, 23 Aug 2018 15:16:00 -0000
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--- Comment #3 from seurer at gcc dot gnu.org ---
First off I know little about Fortran. I looked at some articles about how to
write out values and changed the code to this (sorry if this offends any
Fortran enthusiasts):
WRITE(*,'(L1,L2,F8.2,F8.2,F8.2)') rg, vresult, abs (rg - 0.0), abs (vresult -
0.0), abs (rg - vresult)
if (abs (rg - vresult) .ge. e) STOP 9
WRITE(*,'(L1,L2,F8.2,F8.2,F8.2)') rw, vresult, abs (rw - 0.0), abs (vresult -
0.0), abs (rw - vresult)
if (abs (rw - vresult) .ge. e) STOP 10
WRITE(*,'(L1,L2,F8.2,F8.2,F8.2)') rv, vresult, abs (rv - 0.0), abs (vresult -
0.0), abs (rv - vresult)
if (abs (rv - vresult) .ge. e) STOP 11
if (abs (rc - vresult) .ge. e) STOP 12
When I run it with r263751 I get:
T T 10.00 10.00 0.00
T T 10.00 10.00 0.00
T T 9.00 10.00 1.00
STOP 11
FAIL: libgomp.oacc-fortran/reduction-3.f90 -DACC_DEVICE_TYPE_host=1
-DACC_MEM_SHARED=1 -O1 execution test
With r263750 I get:
T T 10.00 10.00 0.00
T T 10.00 10.00 0.00
T T 10.00 10.00 0.00
PASS: libgomp.oacc-fortran/reduction-3.f90 -DACC_DEVICE_TYPE_host=1
-DACC_MEM_SHARED=1 -O1 execution test
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Subject: [Bug hsa/86948] Internal compiler error compiling brig.dg/test/gimple/mulhi.hsail
Date: Thu, 23 Aug 2018 15:31:00 -0000
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--- Comment #6 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Please follow up on the ML to
https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01128.html
>From gcc-bugs-return-613546-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 16:04:03 2018
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Subject: [Bug bootstrap/84554] make check: FAIL: tversion: ERROR! The versions of gmp.h (5.0.5) and libgmp (4.3.1) do not match.
Date: Thu, 23 Aug 2018 16:04:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to matthew.hambley from comment #1)
> What seems to be happening is that it's correctly picking up gmp.h from the
> in-source version but and old version of the library from
> /usr/lib64/libgmp.so.
That shouldn't be possible, because by using contrib/download_prerequisites GCC
will link to a static in-tree libgmp.a and so doesn't need any libgmp.so at
all.
Do you have any odd environment variables that would be forcing it to link to
the shared library?
>From gcc-bugs-return-613547-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 16:30:48 2018
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Subject: [Bug target/86722] ifcvt produces x&0 that is never cleaned up
Date: Thu, 23 Aug 2018 16:30:00 -0000
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--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
noce_try_cmove has
if ((CONSTANT_P (if_info->a) || register_operand (if_info->a, VOIDmode))
&& (CONSTANT_P (if_info->b) || register_operand (if_info->b, VOIDmode)))
but the first 3 times we go through there, we give up because if_info->a is
(mem/u/c:DF (symbol_ref/u:DI ("*.LC1") [flags 0x2]) [0 S8 A64])
Looking in the dump, I see:
(insn 6 15 16 5 (set (reg:DF 88 [ iftmp.0_3 ])
(mem/u/c:DF (symbol_ref/u:DI ("*.LC1") [flags 0x2]) [0 S8 A64]))
"e.c":3 130 {*movdf_internal}
(expr_list:REG_EQUAL (const_double:DF 0.0 [0x0.0p+0])
(nil)))
so if we had looked through the REG_EQUAL to see the constant, things might
have worked better. I don't know if we can do that though, since we seem very
adverse to anything that looks like constant propagation in RTL.
In ce2, we arrive there with registers instead of constants, so we do
transform, but without seeing the constant 0 we cannot simplify.
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/87073] New: go bootstrap failure due to ICE in vr_values::extract_range_from_binary_expr
Date: Thu, 23 Aug 2018 16:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87073
Bug ID: 87073
Summary: go bootstrap failure due to ICE in
vr_values::extract_range_from_binary_expr
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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Priority: P3
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I see an ICE in an x86_64-linux bootstrap:
/opt/notnfs/msebor/src/gcc/87028/libgo/go/runtime/runtime.go:26:1: internal
compiler error: Segmentation fault
26 | func tickspersecond() int64 {
| ^
yes
checking for exp... 0xcc972f crash_signal
/opt/notnfs/msebor/src/gcc/87028/gcc/toplev.c:325
0x7fe5f045d94f ???
/usr/src/debug/glibc-2.24-66-gd5a4092c36/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0xf4f5b3 generic_wide_int<wide_int_ref_storage<false, true> >::elt(unsigned
int) const
/opt/notnfs/msebor/src/gcc/87028/gcc/wide-int.h:908
0xf4f5b3 wide_int_to_tree_1
/opt/notnfs/msebor/src/gcc/87028/gcc/tree.c:1488
yes
checking for expl... 0xf35ad2 extract_range_from_binary_expr_1(value_range*,
tree_code, tree_node*, value_range*, value_range*)
/opt/notnfs/msebor/src/gcc/87028/gcc/tree-vrp.c:1675
0xf36247 extract_range_from_binary_expr_1(value_range*, tree_code, tree_node*,
value_range*, value_range*)
/opt/notnfs/msebor/src/gcc/87028/gcc/tree-vrp.c:1373
0xf9c846 vr_values::extract_range_from_binary_expr(value_range*, tree_code,
tree_node*, tree_node*, tree_node*)
/opt/notnfs/msebor/src/gcc/87028/gcc/vr-values.c:768
0xf9ea70 vr_values::extract_range_from_assignment(value_range*, gassign*)
/opt/notnfs/msebor/src/gcc/87028/gcc/vr-values.c:1429
0x146d968 evrp_range_analyzer::record_ranges_from_stmt(gimple*, bool)
/opt/notnfs/msebor/src/gcc/87028/gcc/gimple-ssa-evrp-analyze.c:293
0x148e8cd before_dom_children
/opt/notnfs/msebor/src/gcc/87028/gcc/gimple-ssa-sprintf.c:3968
0x14506f2 dom_walker::walk(basic_block_def*)
/opt/notnfs/msebor/src/gcc/87028/gcc/domwalk.c:353
0x1487e5b execute
/opt/notnfs/msebor/src/gcc/87028/gcc/gimple-ssa-sprintf.c:3996
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Makefile:2941: recipe for target 'runtime.lo' failed
make[4]: *** [runtime.lo] Error 1
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From: "konstantin.vladimirov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87074] New: Vectorization bug: O3 result differ from O2
Date: Thu, 23 Aug 2018 16:57:00 -0000
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Bug ID: 87074
Summary: Vectorization bug: O3 result differ from O2
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
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Reporter: konstantin.vladimirov at gmail dot com
Target Milestone: ---
Reproduction:
long b;
unsigned c[5];
unsigned long long d = 3;
int e, f, g;
void h() {
for (; f < 11; f++) {
b = g;
for (e = 0; e < 5; e++) {
c[e] = e - b - (c[e] >> 5);
g = c[e];
}
}
if (c[0])
d = 0;
}
int main() {
h();
return d;
}
Compiler:
> gcc -v
Reading specs from
/apps/gcc/8.1.0/.bin/../lib64/gcc/x86_64-suse-linux/8.1.0/specs
COLLECT_GCC=/apps/gcc/8.1.0/.bin/gcc
COLLECT_LTO_WRAPPER=/apps/gcc/8.1.0/.bin/../libexec/gcc/x86_64-suse-linux/8.1.0/lto-wrapper
Target: x86_64-suse-linux
Configured with: ./configure --prefix=/apps/gcc/8.1.0
--libdir=/apps/gcc/8.1.0/lib64 --libexecdir=/apps/gcc/8.1.0/libexec
--bindir=/apps/gcc/8.1.0/bin --with-isl=/apps/gcc/8.1.0
--with-libelf=/apps/gcc/8.1.0 --with-mpfr=/apps/gcc/8.1.0
--with-gmp=/apps/gcc/8.1.0 --with-mpc=/apps/gcc/8.1.0
--disable-gnu-unique-object --enable-gold=yes --enable-lto
--enable-languages=c,c++,objc,fortran --build=x86_64-suse-linux
--host=x86_64-suse-linux --target=x86_64-suse-linux --enable-libotm
--disable-multilib --disable-bootstrap --disable-libstdcxx-pch
Thread model: posix
gcc version 8.1.0 (GCC)
Compile and run with:
> gcc -O2 minimize.c
> ./a.out
> echo $?
0
> gcc -O3 minimize.c
> ./a.out
> echo $?
3
0 is correct, 3 is incorrect
I also tried with sanitizer, just in case I missed some UB here
> gcc -O2 -fsanitize=undefined minimize.c
> ./a.out
Sanitizer catchs nothing. So if there is really UB (not sure) it is sanitizer
bug.
Clang 6 returns 0 in both cases. GCC 7.3.0 also returns 0 both times.
>From gcc-bugs-return-613550-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 16:58:03 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/87073] go bootstrap failure due to ICE in vr_values::extract_range_from_binary_expr
Date: Thu, 23 Aug 2018 16:58:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=87059
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
I wonder if it's related to pr87059.
>From gcc-bugs-return-613551-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 17:48:04 2018
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Subject: [Bug c++/82760] Incorrect code generated for aligned new
Date: Thu, 23 Aug 2018 17:48:00 -0000
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Marc Glisse <glisse at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
I think this was fixed by Jason's patch. Please reopen otherwise.
>From gcc-bugs-return-613552-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 18:01:34 2018
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Subject: [Bug bootstrap/87073] go bootstrap failure due to ICE in vr_values::extract_range_from_binary_expr
Date: Thu, 23 Aug 2018 18:01:00 -0000
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Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |aldyh at gcc dot gnu.org
--- Comment #2 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #1)
> I wonder if it's related to pr87059.
No, not related.
Reproduced with a stage1 compiler just with --disable-multilib and
--enable-languages=go and make all-target-libgo.
This one's entirely my fault. For all my whining about Ada, I should really
start testing go and ada for all my VRP changes :-/.
Does this cause the bootstrap to succeed?
diff --git a/gcc/wide-int-range.cc b/gcc/wide-int-range.cc
index cbc71c25cfe..3cdcede04cd 100644
--- a/gcc/wide-int-range.cc
+++ b/gcc/wide-int-range.cc
@@ -687,14 +687,11 @@ wide_int_range_div (wide_int &wmin, wide_int &wmax,
/* If we know we won't divide by zero, just do the division. */
if (!wide_int_range_includes_zero_p (divisor_min, divisor_max, sign))
- {
- wide_int_range_multiplicative_op (wmin, wmax, code, sign, prec,
- dividend_min, dividend_max,
- divisor_min, divisor_max,
- overflow_undefined,
- overflow_wraps);
- return true;
- }
+ return wide_int_range_multiplicative_op (wmin, wmax, code, sign, prec,
+ dividend_min, dividend_max,
+ divisor_min, divisor_max,
+ overflow_undefined,
+ overflow_wraps);
/* If flag_non_call_exceptions, we must not eliminate a division
by zero. */
>From gcc-bugs-return-613553-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 18:03:07 2018
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Subject: [Bug c++/80792] worse code generated compared to clang when using std::tuple
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Marc Glisse <glisse at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
No objection has appeared.
>From gcc-bugs-return-613554-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 18:21:34 2018
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From: "virtuousfox at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/87071] libstdc++ crashes during GPU driver initialization with suspected attempt to execute unsupported instruction by Athlon64 X2 TK-57
Date: Thu, 23 Aug 2018 18:21:00 -0000
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--- Comment #7 from Sergey Kondakov <virtuousfox at gmail dot com> ---
Created attachment 44583
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44583&action=edit
Xorg.pid-1381.gdb.log with disas
(In reply to Alexander Monakov from comment #6)
> In your gdb script, please add
>
> x/i $pc
> disas
>
> after the backtrace command (probably 'bt full') and regenerate the log.
> Without that the log doesn't actually show the "illegal" instruction.
>
Now, THAT's some real advice, thanks ! I've managed get that log but…
> Also please show output of rpm -qf /usr/lib64/dri/r300_dri.so
This, of course, points to Mesa-dri package BUT that gave me an idea to not
rule out Mesa yet. And, indeed, it was the culprit all along, despite of what
its dev have said. Or, more accurately, it was clang/LLVM… probably, I haven't
properly checked yet.
I've forked distro package (or, more precisely, its auto-build OBS scripts) of
Mesa to build it with LTO and decrease its monstrous size. But it doesn't
compile with gcc that way because of a long-standing bug and broken autotools
scripts + OBS can't handle requirements of full LTO anyway. So I used clang &
gold for building Mesa (and only it) with ThinLTO and it worked (and works, on
newer PCs) fine.
I spent days on figuring that out and hours on fighting package manager to
selectively install "old", default Mesa package-set without affecting anything
else. And it worked, crash is gone. Maybe it was combination of factors but I
shouldn't have believed Mesa is irrelevant, as I was told, just because it's
far from being the first in the chain of jumps of the backtrace. But then
again, I don't have much clue about how it works.
So, this issue can be closed UNLESS you think that backtrace shouldn't have
lead to libstdc++ anyway and/or clang & Mesa couldn't have failed like that on
their own. Normally, such suicidal code should not come out of a compiler with
almost-default non-aggressive settings, wherever it may be.
(In reply to Uroš Bizjak from comment #4)
> (In reply to Sergey Kondakov from comment #3)
>
> > If your code is correct then whose isn't ?
> Instructions are generated by the compiler. So, it is the compiler's fault,
> it probably emits a SSE instruction that your processor doesn't understand.
>
> That said, at least we need a runtime testcase that fails on your target. If
> this is not possible, then please at least decompile the library and show
> the instruction that fails. We also need preprocessed source and exact
> instructions, how to build the source, so the illegal insn will be generated.
>
> Also, please read https://gcc.gnu.org/bugs/
Oh, I've read that, all right.
Full verbose (very, very verbose) build logs, self-tests, compilation scripts
and built gcc/libstdc++ packages are in the OBS links in the original post,
more precisely:
https://build.opensuse.org/package/live_build_log/devel:gcc/gcc8/openSUSE_Factory/x86_64
https://build.opensuse.org/package/binaries/devel:gcc/gcc8/openSUSE_Factory
(requires OBS registration to show download links)
https://download.opensuse.org/repositories/devel:/gcc/openSUSE_Factory/ (does
not require registration but page with massive package-listing halts browser
and requires a lot of RAM to view)
Except for https://build.opensuse.org/package/show/home:X0F:HSF/Mesa where my
Mesa-dri:r300_dri.so is built.
But asking to decompile one of the core system libraries or make an example,
faulty program on a spot is like asking to decompile kernel or write a driver
(actually, probably even worse): anyone capable of doing it in a day does not
require anyone else's software-related assistance.
(In reply to Jonathan Wakely from comment #5)
> Right. As you can see in GDB, the libstdc++ code says:
>
> 350 return static_cast<char_type*>(__builtin_memcpy(__s1, __s2, __n));
>
> Do you see any processor instructions there? Anything that isn't valid on
> your CPU? No, because it's just C++ code.
I see a bunch of over-complicated gibberish starting with libstdc++ which was
used as an argument by widely-known, reputable and respected Mesa developer to
look into libstdc++. Your reclussive, insular existance and passive-aggressive
"deal with issues of our _irreplaceable_ software, requiring high-level
low-abstraction-layer engineer-grade knowledge and experience,
yourself"-attitude in relation to one of the most obscure subject matters, on
the other hand, begets only distrust and frustration.
As the result, I spent almost no time investigating my suspicion which was
correct in the first place, spent a lot of effort to investigate his claim and
couldn't do anything with yours because of how non-productive it was.
> (In reply to Uroš Bizjak from comment #4)
> > Also, please read https://gcc.gnu.org/bugs/
>
> I already said that before the bug was even filed.
No wonder googling "gcc bugzilla registration" brings up an upvoted years-old
post that's advising not to bother.
>From gcc-bugs-return-613555-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 18:34:32 2018
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Subject: [Bug bootstrap/87013] Error: junk at end of line, first unrecognized character is `i'
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--- Comment #7 from martin <mfe at live dot de> ---
Created attachment 44584
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44584&action=edit
gcc\config.log
Hi, sry for the delayed answer. I wanted to make sure that the compiler passed
the related point, but I don't know how to verify this (the machine is still
compiling). So I assume the patch is working. I attached the config.log.
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Subject: [Bug bootstrap/87073] go bootstrap failure due to ICE in vr_values::extract_range_from_binary_expr
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--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Yes Aldy, your patch does make the ICE go away.
>From gcc-bugs-return-613557-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 18:59:50 2018
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Subject: [Bug c++/87075] New: ICE when compiling the test suite of GLM 0.9.9.0
Date: Thu, 23 Aug 2018 18:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87075
Bug ID: 87075
Summary: ICE when compiling the test suite of GLM 0.9.9.0
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: guus at debian dot org
Target Milestone: ---
When compiling the test suite of GLM 0.9.9.0, a header-only OpenGL mathematics
library, a compiler error occurs with GCC 7 and later, but it seems earlier
versions work fine. The attached dump is from 8.2.0 when compiling the test
suite. A minimal program to reproduce it, with the GLM 0.9.9.0 headers
installed, is:
#include <glm/glm.hpp>
using namespace glm;
int main() {
mat2 a(0,1,2,3); // GCC from trunk already fails here
mat2 b = matrixCompMult(a, a);
mat2 c = mat2(0,1,2,3); // no ICE on 8.2.0 for: mat2 c(0,1,2,3);
}
The error message when compiling this example with 8.2.0:
<source>: In function 'int main()':
<source>:8:26: internal compiler error: in gimplify_expr, at gimplify.c:12385
mat2 c = mat2(0,1,2,3); // no ICE on 8.2.0 for: mat2 c(0,1,2,3);
^
The error message when compiling this example with trunk:
<source>: In function 'int main()':
<source>:6:19: in 'constexpr' expansion of 'a.glm::mat<2, 2, float,
(glm::qualifier)0>::mat<int, int, int, int>(0, 1, 2, 3)'
<source>:6:19: internal compiler error: tree check: expected constructor, have
void_cst in cxx_eval_store_expression, at cp/constexpr.c:3785
6 | mat2 a(0,1,2,3); // GCC from trunk already fails here
| ^
Let me know if I can provide more help.
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From: "vlad at ispras dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/87076] New: -mpcu/-march not propagated through LTO bytecode (ice/segfault if arch flags do not match)
Date: Thu, 23 Aug 2018 19:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87076
Bug ID: 87076
Summary: -mpcu/-march not propagated through LTO bytecode
(ice/segfault if arch flags do not match)
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: vlad at ispras dot ru
CC: marxin at gcc dot gnu.org
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# run.sh:
cat << EOF > 1.c
typedef int i1 __attribute__((aligned(1)));
int f(i1 *p)
{
return *p;
}
EOF
# base=/usr/lib/gcc/arm-none-eabi/8.2.0/
case $1 in
ice|"")
$base/cc1 1.c -march=armv7-r -mthumb -flto
arm-none-eabi-as 1.s -o 1.o
# Next line yields a warning. Also note Tag_CPU_unaligned_access in 2.s
$base/lto1 -munaligned-access -fverbose-asm 1.o -o 2.s
;;
segfault)
$base/cc1 1.c -mthumb -flto
arm-none-eabi-as 1.s -o 1.o
$base/lto1 -march=armv7-r 1.o
;;
esac
# end of run.sh
FWIW, having -mcpu=cortex-r4 in place of -march=armv7-r in this script doesn't
change anything.
$ ./run.sh ice
Looks like it has always given the
warning: target CPU does not support unaligned accesses
(I tested on gcc-{5,6,7,8,trunk}.)
This is because -march=armv7-r (which would cause unaligned_access to be set)
is not visible in lto1 -- it seems neither -march/-mcpu, nor
Tag_CPU_unaligned_access is serialized.
Also, since r231114 -- gcc-6 and above -- lto1 throws an ICE:
1.c: In function 'f':
1.c:5:1: internal compiler error: output_operand: invalid %-code
}
^
0x89b17a output_operand_lossage(char const*, ...)
/mnt/co/gcc/gcc/final.c:3409
0x89bcdb output_asm_insn(char const*, rtx_def**)
/mnt/co/gcc/gcc/final.c:3774
0x89a796 final_scan_insn(rtx_insn*, _IO_FILE*, int, int, int*)
/mnt/co/gcc/gcc/final.c:3015
0x898a44 final(rtx_insn*, _IO_FILE*, int)
/mnt/co/gcc/gcc/final.c:2045
0x89d237 rest_of_handle_final
/mnt/co/gcc/gcc/final.c:4441
0x89d436 execute
/mnt/co/gcc/gcc/final.c:4516
Probably because this
- if (unaligned_access)
- builtin_define ("__ARM_FEATURE_UNALIGNED");
+ def_or_undef_macro (pfile, "__ARM_FEATURE_UNALIGNED", unaligned_access);
changed the semantics: it used to only define, now it also undefs the macro.
But it only made the underlying problem surface.
$ ./run.sh segfault
segfaults with gcc-8 and trunk:
In function 'f':
lto1: internal compiler error: Segmentation fault
0xec8f1c crash_signal
/mnt/co/gcc/gcc/toplev.c:325
0x1aa3dca arm_parse_arch_option_name(arch_option const*, char const*, char
const*, bool)
/mnt/co/gcc/gcc/common/config/arm/arm-common.c:394
0x133e85c arm_configure_build_target(arm_build_target*, cl_target_option*,
gcc_options*, bool)
/mnt/co/gcc/gcc/config/arm/arm.c:3123
0x133e3dd arm_option_restore
/mnt/co/gcc/gcc/config/arm/arm.c:2989
0xd7328e cl_target_option_restore(gcc_options*, cl_target_option*)
/mnt/bld/gcc-trunk-arm/gcc-gomp-host/gcc/options-save.c:3749
0x138ddec arm_set_current_function
/mnt/co/gcc/gcc/config/arm/arm.c:30609
0xaa339d invoke_set_current_function_hook
/mnt/co/gcc/gcc/function.c:4616
0xaa36d1 allocate_struct_function(tree_node*, bool)
/mnt/co/gcc/gcc/function.c:4729
0xaa39d8 push_struct_function(tree_node*)
/mnt/co/gcc/gcc/function.c:4792
0xccbbbd input_function
/mnt/co/gcc/gcc/lto-streamer-in.c:1065
0xccc668 lto_read_body_or_constructor
/mnt/co/gcc/gcc/lto-streamer-in.c:1295
0xccc97c lto_input_function_body(lto_file_decl_data*, cgraph_node*, char
const*)
/mnt/co/gcc/gcc/lto-streamer-in.c:1343
0x8d1084 cgraph_node::get_untransformed_body()
/mnt/co/gcc/gcc/cgraph.c:3548
0x8de11b cgraph_node::expand()
/mnt/co/gcc/gcc/cgraphunit.c:2091
0x8ded39 output_in_order
/mnt/co/gcc/gcc/cgraphunit.c:2365
0x8df479 symbol_table::compile()
/mnt/co/gcc/gcc/cgraphunit.c:2609
0x7ee5d3 lto_main()
/mnt/co/gcc/gcc/lto/lto.c:3428
Of course, none of this happens if the user specifies same arch flags for lto1
as they did for cc1. But my understanding is that
a. the compiler should not segfault;
b. it could store this information in the bytecode as it does for other
function attributes. And it probably should: consider what happens if we
specify __attribute__ ((__target__ ("arch=armv7-r"))) for f [for some reason,
this feature doesn't work for me without LTO either, but that's a separate
issue], or what happens if different TUs were compiled with different -march's;
c. from the usability standpoint, this would allow the lazy user to forget to
specify the flags for LTO link and still have the correct ones deduced for
them.
>From gcc-bugs-return-613559-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 19:03:20 2018
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From: "guus at debian dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87075] ICE when compiling the test suite of GLM 0.9.9.0
Date: Thu, 23 Aug 2018 19:03:00 -0000
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Guus Sliepen <guus at debian dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |guus at debian dot org
--- Comment #1 from Guus Sliepen <guus at debian dot org> ---
Created attachment 44585
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44585&action=edit
GCC dump
>From gcc-bugs-return-613561-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 19:08:29 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87072] [6/7 Regression] g++6.2.0 false warning: array subscript is above array bounds, with misleading line number
Date: Thu, 23 Aug 2018 19:08:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |4.7.4, 8.1.0, 9.0
Keywords| |diagnostic
Last reconfirmed| |2018-08-23
CC| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
Summary|g++6.2.0 false warning: |[6/7 Regression] g++6.2.0
|array subscript is above |false warning: array
|array bounds, with |subscript is above array
|misleading line number |bounds, with misleading
| |line number
Known to fail| |6.4.0, 7.3.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed with GCC 5, 6 and 7. The warning wasn't issued by GCC 4.7, started
with 4.8, and went away in 8.0 with r255267. I suspect the change is not going
to be backported.
2017-11-30 Richard Biener <rguenther@suse.de>
PR tree-optimization/83202
* tree-ssa-loop-ivcanon.c (try_unroll_loop_completely): Add
allow_peel argument and guard peeling.
(canonicalize_loop_induction_variables): Likewise.
(canonicalize_induction_variables): Pass false.
(tree_unroll_loops_completely_1): Pass unroll_outer to disallow
peeling from cunrolli.
>From gcc-bugs-return-613560-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 19:08:28 2018
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87075] ICE when compiling the test suite of GLM 0.9.9.0
Date: Thu, 23 Aug 2018 19:08:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-23
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed:
$ ./cc1plus -quiet 87075.ii
/home/guus/scratch/glm/glm/test/core/core_func_matrix.cpp: In function ‘int
test_matrixCompMult()’:
/home/guus/scratch/glm/glm/test/core/core_func_matrix.cpp:17:20: in
‘constexpr’ expansion of ‘m.glm::mat<2, 2, float, (glm::qualifier)0>::mat<int,
int, int, int>(0, 1, 2, 3)’
/home/guus/scratch/glm/glm/test/core/core_func_matrix.cpp:17:20: internal
compiler error: tree check: expected constructor, have void_cst in
cxx_eval_store_expression, at cp/constexpr.c:3785
0x161e07d tree_check_failed(tree_node const*, char const*, int, char const*,
...)
/home/mpolacek/src/gcc/gcc/tree.c:9370
0x840141 tree_check(tree_node*, char const*, int, char const*, tree_code)
/home/mpolacek/src/gcc/gcc/tree.h:3120
0x8b072d cxx_eval_store_expression
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:3785
0x8b29fd cxx_eval_constant_expression
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4355
0x8b3828 cxx_eval_constant_expression
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4664
0x8b2ca2 cxx_eval_constant_expression
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4403
0x8b2ca2 cxx_eval_constant_expression
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4403
0x8b132c cxx_eval_statement_list
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:3996
0x8b3e46 cxx_eval_constant_expression
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4755
0x8b3ec5 cxx_eval_constant_expression
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4759
0x8b132c cxx_eval_statement_list
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:3996
0x8b3e46 cxx_eval_constant_expression
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4755
0x8a78a2 cxx_eval_call_expression
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:1737
0x8b2201 cxx_eval_constant_expression
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4276
0x8b4be3 cxx_eval_outermost_constant_expr
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4980
0x8b5e00 maybe_constant_init_1
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:5328
0x8b5e8a maybe_constant_init(tree_node*, tree_node*, bool)
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:5345
0x974f2b expand_default_init
/home/mpolacek/src/gcc/gcc/cp/init.c:1982
0x97544a expand_aggr_init_1
/home/mpolacek/src/gcc/gcc/cp/init.c:2085
0x9740b5 build_aggr_init(tree_node*, tree_node*, int, int)
/home/mpolacek/src/gcc/gcc/cp/init.c:1819
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
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Subject: [Bug c/87028] false positive -Wstringop-truncation strncpy with global variable source string
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87028
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
The test case in pr84474 uses strncpy to needlessly exclude the terminating nul
from the copy only to then add it explicitly. That's not what the function is
meant to be used for -- when it's safe to copy the whole string using strcpy is
more appropriate.
The test case in this bug is different because it uses strncpy to copy only the
leading part of a string, up to the size of the destination, excluding more
than just the terminating nul. In general, that is one of the valid use cases
for strncpy, but in designing the warning and faced with the GCC strncpy to
memcpy transformation, I considered the constant case to be more likely a
mistake than not. To help me gauge the priority of this report, how common is
it intended in your experience (and how much software does that represent)?
I have been working with Miguel and others on fixing false positives exposed by
the kernel. I believe they decided that the warning is useful despite some
lingering instances of it and have been putting it to good use (in conjunction
with the new nonstring attribute).
There are a few ways to avoid the warning in the constant case:
1) use a different function
2) use __attribute__ ((nonstring))
3) suppress the diagnostic using #pargma GCC ignore
(1) might be:
memcpy (s->dest, src, min (sizeof (s->dest) - 1, strlen (src)));
(2) would look like this:
__attribute__ ((nonstring)) char *d = s->dest;
strncpy (d, src, sizeof (s->dest) - 1);
I realize these are workarounds and that getting the suppression to work in GCC
would be ideal. It's trivial to do:
@@ -1653,6 +1654,9 @@ gimple_fold_builtin_strncpy (gimple_stmt_iterator
tree dest, tree src, tree len)
{
gimple *stmt = gsi_stmt (*gsi);
+ if (!gimple_bb (stmt))
+ return false;
+
location_t loc = gimple_location (stmt);
but because it defers the strncpy folding it will likely be controversial.
>From gcc-bugs-return-613563-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 19:21:24 2018
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From: "trashyankes at wp dot pl" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87077] New: missed optimization for horizontal add for x86 SSE
Date: Thu, 23 Aug 2018 19:21:00 -0000
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Bug ID: 87077
Summary: missed optimization for horizontal add for x86 SSE
Product: gcc
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During some experiments with toy programs I find out that GCC do not do any
horizontal adding for xmm registers.
Some benchmark code:
http://quick-bench.com/HhZPnOtb9SYYK8z4IMKb_XAWYCI
If I'm not mistaken both function do same work and one hand written is faster.
And IIRC `_mm_hadd_ps` is consider a slow way to do this but is still faster
than standard function.
Is my finding correct or I simply miss some important details why GCC do not do
this?
>From gcc-bugs-return-613564-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 19:29:33 2018
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Subject: [Bug testsuite/87078] New: [9 regression] gcc.dg/vect/slp-37.c begins failing with r263772
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Bug ID: 87078
Summary: [9 regression] gcc.dg/vect/slp-37.c begins failing
with r263772
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Does the test case needs updating with this revision? Hmmm, the test case WAS
updated it looks like.
Some further testing shows this happens only on power 7 and earlier. Power 8
and 9 work fine.
testgcc: 263772 had unexpected test case failures
testgcc: results of test run:
# of expected passes 4
# of unexpected failures 4
FAIL: gcc.dg/vect/slp-37.c scan-tree-dump-times vect "vectorized 1 loops" 1
FAIL: gcc.dg/vect/slp-37.c scan-tree-dump-times vect "vectorizing stmts using
SLP" 1
FAIL: gcc.dg/vect/slp-37.c -flto -ffat-lto-objects scan-tree-dump-times vect
"vectorized 1 loops" 1
FAIL: gcc.dg/vect/slp-37.c -flto -ffat-lto-objects scan-tree-dump-times vect
"vectorizing stmts using SLP" 1
make -k check-gcc RUNTESTFLAGS=vect.exp=gcc.dg/vect/slp-37.c
Executing on host: /home/seurer/gcc/build/gcc-trunk/gcc/xgcc
-B/home/seurer/gcc/build/gcc-trunk/gcc/
/home/seurer/gcc/gcc-trunk/gcc/testsuite/gcc.dg/vect/slp-37.c
-fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -maltivec -mvsx -mno-allow-movmisalign
-ftree-vectorize -fno-vect-cost-model -fno-common -O2 -fdump-tree-vect-details
-lm -o ./slp-37.exe (timeout = 300)
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-trunk/gcc/xgcc
-B/home/seurer/gcc/build/gcc-trunk/gcc/
/home/seurer/gcc/gcc-trunk/gcc/testsuite/gcc.dg/vect/slp-37.c
-fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -maltivec -mvsx -mno-allow-movmisalign
-ftree-vectorize -fno-vect-cost-model -fno-common -O2 -fdump-tree-vect-details
-lm -o ./slp-37.exe
PASS: gcc.dg/vect/slp-37.c (test for excess errors)
Setting LD_LIBRARY_PATH to
:/home/seurer/gcc/build/gcc-trunk/gcc::/home/seurer/gcc/build/gcc-trunk/gcc:/home/seurer/gcc/build/gcc-trunk/./gmp/.libs:/home/seurer/gcc/build/gcc-trunk/./prev-gmp/.libs:/home/seurer/gcc/build/gcc-trunk/./mpfr/src/.libs:/home/seurer/gcc/build/gcc-trunk/./prev-mpfr/src/.libs:/home/seurer/gcc/build/gcc-trunk/./mpc/src/.libs:/home/seurer/gcc/build/gcc-trunk/./prev-mpc/src/.libs:/home/seurer/gcc/build/gcc-trunk/./isl/.libs:/home/seurer/gcc/build/gcc-trunk/./prev-isl/.libs:/home/seurer/gcc/install/gcc-7.2.0/lib64
Execution timeout is: 300
spawn [open ...]
PASS: gcc.dg/vect/slp-37.c execution test
gcc.dg/vect/slp-37.c: pattern found 0 times
FAIL: gcc.dg/vect/slp-37.c scan-tree-dump-times vect "vectorized 1 loops" 1
gcc.dg/vect/slp-37.c: pattern found 0 times
FAIL: gcc.dg/vect/slp-37.c scan-tree-dump-times vect "vectorizing stmts using
SLP" 1
Executing on host: /home/seurer/gcc/build/gcc-trunk/gcc/xgcc
-B/home/seurer/gcc/build/gcc-trunk/gcc/
/home/seurer/gcc/gcc-trunk/gcc/testsuite/gcc.dg/vect/slp-37.c
-fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -flto -ffat-lto-objects -maltivec -mvsx
-mno-allow-movmisalign -ftree-vectorize -fno-vect-cost-model -fno-common -O2
-fdump-tree-vect-details -lm -o ./slp-37.exe (timeout = 300)
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-trunk/gcc/xgcc
-B/home/seurer/gcc/build/gcc-trunk/gcc/
/home/seurer/gcc/gcc-trunk/gcc/testsuite/gcc.dg/vect/slp-37.c
-fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -flto -ffat-lto-objects -maltivec -mvsx
-mno-allow-movmisalign -ftree-vectorize -fno-vect-cost-model -fno-common -O2
-fdump-tree-vect-details -lm -o ./slp-37.exe
PASS: gcc.dg/vect/slp-37.c -flto -ffat-lto-objects (test for excess errors)
Setting LD_LIBRARY_PATH to
:/home/seurer/gcc/build/gcc-trunk/gcc::/home/seurer/gcc/build/gcc-trunk/gcc:/home/seurer/gcc/build/gcc-trunk/./gmp/.libs:/home/seurer/gcc/build/gcc-trunk/./prev-gmp/.libs:/home/seurer/gcc/build/gcc-trunk/./mpfr/src/.libs:/home/seurer/gcc/build/gcc-trunk/./prev-mpfr/src/.libs:/home/seurer/gcc/build/gcc-trunk/./mpc/src/.libs:/home/seurer/gcc/build/gcc-trunk/./prev-mpc/src/.libs:/home/seurer/gcc/build/gcc-trunk/./isl/.libs:/home/seurer/gcc/build/gcc-trunk/./prev-isl/.libs:/home/seurer/gcc/install/gcc-7.2.0/lib64
Execution timeout is: 300
spawn [open ...]
PASS: gcc.dg/vect/slp-37.c -flto -ffat-lto-objects execution test
gcc.dg/vect/slp-37.c -flto -ffat-lto-objects : pattern found 0 times
FAIL: gcc.dg/vect/slp-37.c -flto -ffat-lto-objects scan-tree-dump-times vect
"vectorized 1 loops" 1
gcc.dg/vect/slp-37.c -flto -ffat-lto-objects : pattern found 0 times
FAIL: gcc.dg/vect/slp-37.c -flto -ffat-lto-objects scan-tree-dump-times vect
"vectorizing stmts using SLP" 1
testcase /home/seurer/gcc/gcc-trunk/gcc/testsuite/gcc.dg/vect/vect.exp
completed in 3 seconds
>From gcc-bugs-return-613566-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 19:33:31 2018
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Subject: [Bug target/87067] [8.1, 8.2] LTO-related ICE when running armv7 binutils test suite
Date: Thu, 23 Aug 2018 19:33:00 -0000
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--- Comment #3 from Frank Schaefer <kelledin at gmail dot com> ---
Well...it looks like Vladislav Ivanishin actually nailed down the root-cause
(see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87076 ). His small test
program reproduces the same issue I'm seeing--and based on his input, if I take
the offending commands and add matching -march flags to the link command, the
ICE no longer occurs.
I'm guessing this didn't affect my AArch64 build because AArch64 just doesn't
have significantly-different -march options (I just set it to -march=armv8-a
and left it at that).
I suggest we do any necessary changes under 87076 and mark this as a duplicate.
>From gcc-bugs-return-613565-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 19:33:12 2018
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Subject: [Bug c++/87072] [6/7 Regression] g++6.2.0 false warning: array subscript is above array bounds, with misleading line number
Date: Thu, 23 Aug 2018 19:33:00 -0000
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--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
A simplified test case:
$ cat t.c && gcc -O3 -S -Wall t.c
int a[10];
void f (unsigned n)
{
for (unsigned j = 0; j < n; j++) {
for (unsigned k = 0; k < j; k++)
a[j] += k;
a[j] += j;
}
}
t.c: In function ‘f’:
t.c:7:14: warning: array subscript is above array bounds [-Warray-bounds]
a[j] += k;
~~~~~^~~~
The VRP dump shows the out-of-bounds index:
if (j_16 == 10)
goto <bb 22>; [85.00%]
else
goto <bb 4>; [15.00%]
<bb 22> [3.00%]:
_95 = _44 + 45;
_96 = (int) _95;
a[10] = _96; <<<
goto <bb 4>; [100.00%]
<bb 23> [2.65%]:
return;
}
>From gcc-bugs-return-613567-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 19:34:12 2018
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Subject: [Bug libstdc++/87071] libstdc++ crashes during GPU driver initialization with suspected attempt to execute unsupported instruction by Athlon64 X2 TK-57
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |INVALID
--- Comment #8 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
You should have mentioned you were using a custom-compiled Mesa, not the
distribution package (both here and in the original report to Mesa project).
For some reason the disasm in the provided log is unusable (shows assembly of
the outermost frame), but downloading your package shows that failing
instruction is
928ea: c5 fa 6f 05 0e 09 c3 00 vmovdqu 0xc3090e(%rip),%xmm0
# cc3200 <amdgpu_winsys_create@@Base+0x1539a0>
i.e. an AVX instruction, not supported on the CPU. Given that you were using
Clang to compile the package, this is not a GCC issue.
>From gcc-bugs-return-613568-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 19:39:54 2018
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Subject: [Bug c++/87072] [6/7 Regression] g++6.2.0 false warning: array subscript is above array bounds, with misleading line number
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--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Thu Aug 23 19:39:18 2018
New Revision: 263822
URL: https://gcc.gnu.org/viewcvs?rev=263822&root=gcc&view=rev
Log:
PR tree-optimization/87072 - false warning: array subscript is above array
bounds
gcc/testsuite/ChangeLog:
* gcc.dg/Warray-bounds-35.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/Warray-bounds-35.c
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug rtl-optimization/87047] [7/8/9 Regression] performance regression because of if-conversion
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Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |law at gcc dot gnu.org
Component|target |rtl-optimization
--- Comment #6 from Uroš Bizjak <ubizjak at gmail dot com> ---
Soooo...
... back to rtl-optimization.
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Subject: [Bug c++/87075] ICE when compiling the test suite of GLM 0.9.9.0
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Maybe started with r239783.
>From gcc-bugs-return-613571-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 20:08:21 2018
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
Date: Thu, 23 Aug 2018 20:08:00 -0000
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--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
The MIN_EXPR code predates my change -- r255898 just moved indentation. Based
on past experience I would assume MIN_EXPR to need the same types. The code in
expand_builtin_strncmp mixes ssizetype and sizetype:
len1 = c_strlen (arg1, 1); // returns ssizetype
len2 = c_strlen (arg2, 1);
if (len1)
len1 = size_binop_loc (loc, PLUS_EXPR, ssize_int (1), len1);
if (len2)
len2 = size_binop_loc (loc, PLUS_EXPR, ssize_int (1), len2);
len3 = fold_convert_loc (loc, sizetype, arg3);
...
if (len != len3)
len = fold_build2_loc (loc, MIN_EXPR, TREE_TYPE (len), len, len3);
So the fix is presumably to change len3 to
len3 = fold_convert_loc (loc, ssizetype, arg3);
Given the difference between sizetype and ssizetype is just one 's' it seems
like an easy mistake to make. If MIN_EXPR does, in fact, require arguments of
the same type then adding an assertion to fold_binary_loc() to verify it would
help expose these mistakes early. I'm not sure what the right predicate is to
use in the assertion. Just compare TYPE_MAIN_VARIANT of the two argument types
for equality?
>From gcc-bugs-return-613572-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 20:17:50 2018
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Subject: [Bug target/87077] missed optimization for horizontal add for x86 SSE
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--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
SLP doesn't like the completely unrolled code. With #pragma GCC unroll 1, we
get at least some kind of vectorization.
>From gcc-bugs-return-613573-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 20:41:52 2018
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Subject: [Bug target/87079] New: nios2 optimization for size - case of regression relatively to 5.3.0
Date: Thu, 23 Aug 2018 20:41:00 -0000
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Bug ID: 87079
Summary: nios2 optimization for size - case of regression
relatively to 5.3.0
Product: gcc
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Created attachment 44586
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44586&action=edit
5.3->8.3 regression - shifts instead of mulx
The issue was already reported together with another case that proved unrelated
to nios2. The original thread is now dedicated to this more general issue, so I
am repeating the reort of the first issue for convenience of tracking.
A case of significant regression in optimization for size between 5.3.0 (a
version supplied in Altera Nios2 SDK) and 8.2.0.
Compiled with -Wall -Os -ffreestanding -fbuiltin -mhw-div -mhw-mul -mhw-mulx
It looks like -Os flag caused to compiler to forget that hw-mulx is present.
The problem appears unique to nios2 back end. Similar back ends (MIPS32r6 and
RISCV32IM) are not affected.
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Subject: [Bug c/87028] false positive -Wstringop-truncation strncpy with global variable source string
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=81704
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
See also bug 81704 for another problem the early folding causes (though
deferring the folding only until the next statement in the basic block can be
reached, which is all it takes to suppress the false positive, won't solve that
bug).
>From gcc-bugs-return-613575-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 20:43:12 2018
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Subject: [Bug tree-optimization/87031] nios2 optimization for size - two cases of regression relatively to 5.3.0
Date: Thu, 23 Aug 2018 20:43:00 -0000
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--- Comment #7 from Michael_S <already5chosen at yahoo dot com> ---
Done. a new report = 87079
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Subject: [Bug c++/87068] No diagnostic on an ill-formed [[fallthrough]]
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01504.html
>From gcc-bugs-return-613577-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 21:06:04 2018
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Subject: [Bug fortran/83113] Bogus "duplicate allocatable attribute" error for submodule character function
Date: Thu, 23 Aug 2018 21:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83113
--- Comment #2 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Still present in 9.0.
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Subject: [Bug c++/87080] New: ice in cp_get_fndecl_from_callee, at cp/cvt.c:965
Date: Thu, 23 Aug 2018 22:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87080
Bug ID: 87080
Summary: ice in cp_get_fndecl_from_callee, at cp/cvt.c:965
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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The following C++ code, on recent gcc trunk, and flag -Wall,
does this:
$ ~/gcc/results/bin/g++ -c -Wall bug459.cc
bug459.cc: In function ‘a fn2()’:
bug459.cc:7:17: internal compiler error: in cp_get_fndecl_from_callee, at
cp/cvt.c:965
7 | return c() << d;
| ^
0x5b0ede cp_get_fndecl_from_callee(tree_node*, bool)
../../trunk/gcc/cp/cvt.c:965
0x5b0ede cp_get_callee_fndecl_nofold(tree_node*)
../../trunk/gcc/cp/cvt.c:992
0xca6670 is_std_move_p
../../trunk/gcc/cp/typeck.c:9147
0xca6670 maybe_warn_pessimizing_move
../../trunk/gcc/cp/typeck.c:9204
class a {
template <typename b> a &operator<<(b);
};
a c();
template <typename> a fn2() {
int d;
return c() << d;
}
>From gcc-bugs-return-613579-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 22:04:33 2018
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Subject: [Bug c++/87080] ice in cp_get_fndecl_from_callee, at cp/cvt.c:965
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--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
The bug seems to first occur between revisions 263693
and 263799, so fairly recent.
>From gcc-bugs-return-613580-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 22:05:21 2018
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From: "seurer at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug testsuite/87081] New: [9 regression] new test case failures with r262930
Date: Thu, 23 Aug 2018 22:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87081
Bug ID: 87081
Summary: [9 regression] new test case failures with r262930
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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Priority: P3
Component: testsuite
Assignee: unassigned at gcc dot gnu.org
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Test cases need updating.
make -k check-gcc RUNTESTFLAGS=powerpc.exp=gcc.target/powerpc/vec-init-6.c
# of expected passes 4
# of unexpected failures 2
FAIL: gcc.target/powerpc/vec-init-6.c scan-assembler rldicr
FAIL: gcc.target/powerpc/vec-init-6.c scan-assembler rldicl
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-test2/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test2/gcc/
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.target/powerpc/vec-init-6.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -mcpu=power8 -O2
-ffat-lto-objects -S -o vec-init-6.s
PASS: gcc.target/powerpc/vec-init-6.c (test for excess errors)
FAIL: gcc.target/powerpc/vec-init-6.c scan-assembler rldicr
FAIL: gcc.target/powerpc/vec-init-6.c scan-assembler rldicl
PASS: gcc.target/powerpc/vec-init-6.c scan-assembler mtvsrd
PASS: gcc.target/powerpc/vec-init-6.c scan-assembler-not stw
PASS: gcc.target/powerpc/vec-init-6.c scan-assembler-not lxvw4x
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Subject: [Bug testsuite/87081] [9 regression] gcc.target/powerpc/vec-init-6.c failures with r262930
Date: Thu, 23 Aug 2018 22:09:00 -0000
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seurer at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |powerpc64le-unknown-linux-g
| |nu
CC| |segher at gcc dot gnu.org
Host| |powerpc64le-unknown-linux-g
| |nu
Summary|[9 regression] new test |[9 regression]
|case failures with r262930 |gcc.target/powerpc/vec-init
| |-6.c failures with r262930
Build| |powerpc64le-unknown-linux-g
| |nu
--- Comment #1 from seurer at gcc dot gnu.org ---
This only occurs on LE.
>From gcc-bugs-return-613582-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 22:11:40 2018
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From: "ark at acm dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/87082] New: Missing default argument in string::assign
Date: Thu, 23 Aug 2018 22:11:00 -0000
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Bug ID: 87082
Summary: Missing default argument in string::assign
Product: gcc
Version: 7.3.0
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Priority: P3
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Created attachment 44587
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44587&action=edit
This file should compile but doesn't.
If s is a string, s.assign(t, n) fails to compile. It should be equivalent to
s.assign(t, n, std::npos), which does compile.
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Subject: [Bug testsuite/87081] [9 regression] gcc.target/powerpc/vec-init-6.c failures with r262930
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seurer at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|powerpc64le-unknown-linux-g |powerpc64*-*-*
|nu |
Host|powerpc64le-unknown-linux-g |powerpc64*-*-*
|nu |
Build|powerpc64le-unknown-linux-g |powerpc64*-*-*
|nu |
--- Comment #2 from seurer at gcc dot gnu.org ---
I take that back, it occurs on both LE and BE.
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Subject: [Bug c++/87080] ice in cp_get_fndecl_from_callee, at cp/cvt.c:965
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David Binderman <dcb314 at hotmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
--- Comment #2 from David Binderman <dcb314 at hotmail dot com> ---
svn blame says
263741 mpolacek if (is_std_move_p (fn))
Adding mpolacek
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Subject: [Bug c++/87080] ice in cp_get_fndecl_from_callee, at cp/cvt.c:965
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87080
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-23
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Sorry, will fix.
>From gcc-bugs-return-613586-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 23:26:09 2018
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Subject: [Bug c++/87080] ice in cp_get_fndecl_from_callee, at cp/cvt.c:965
Date: Thu, 23 Aug 2018 23:26:00 -0000
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Probably with this:
--- a/gcc/cp/typeck.c
+++ b/gcc/cp/typeck.c
@@ -9196,6 +9196,9 @@ maybe_warn_pessimizing_move (tree retval, tree functype)
if (!CLASS_TYPE_P (functype))
return;
+ if (processing_template_decl)
+ return;
+
/* We're looking for *std::move<T&> (&arg). */
if (REFERENCE_REF_P (retval)
&& TREE_CODE (TREE_OPERAND (retval, 0)) == CALL_EXPR)
>From gcc-bugs-return-613587-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 23:53:03 2018
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Subject: [Bug libstdc++/87082] Missing default argument in string::assign
Date: Thu, 23 Aug 2018 23:53:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This was reported as PR 84087 and is already fixed on the gcc-7-branch for the
next release (7.4)
*** This bug has been marked as a duplicate of bug 84087 ***
>From gcc-bugs-return-613588-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Aug 23 23:53:03 2018
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Subject: [Bug libstdc++/84087] string::assign problem with two arguments
Date: Thu, 23 Aug 2018 23:53:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ark at acm dot org
--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 87082 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-613589-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 01:12:41 2018
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87075] [7/8/9 Regression] ICE when compiling the test suite of GLM 0.9.9.0
Date: Fri, 24 Aug 2018 01:12:00 -0000
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Reduced:
template <typename T>
struct vec
{
struct { T y; };
vec() = default;
};
template <typename T>
struct S
{
vec<T> value[2];
template<typename U>
constexpr S(const U&);
};
template<typename T>
template<typename X>
constexpr S<T>::S(const X&)
{
value[0] = vec<T>();
}
S<float>m(0);
>From gcc-bugs-return-613590-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 03:01:48 2018
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Subject: [Bug target/87083] New: ICE in extract_insn, at recog.c:2305 (error: unrecognizable insn)
Date: Fri, 24 Aug 2018 03:01:00 -0000
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Bug ID: 87083
Summary: ICE in extract_insn, at recog.c:2305 (error:
unrecognizable insn)
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-valid-code
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Target: powerpcspe-*-linux-gnu*
gcc-9.0.0-alpha20180819 snapshot (r263652) ICEs when compiling the following
snippet w/ -O1 (-O2, -O3, -Ofast) -ftree-loop-vectorize -fno-tree-reassoc:
long long int ll;
int p7;
int
ox (int az, int th)
{
while (az < 1)
{
th ^= 1;
ll ^= p7;
++az;
}
return th;
}
% powerpc-e500v2-linux-gnuspe-gcc-9.0.0-alpha20180819 -O1 -ftree-loop-vectorize
-fno-tree-reassoc -c xuzg2b9u.c
xuzg2b9u.c: In function 'ox':
xuzg2b9u.c:15:1: error: unrecognizable insn:
15 | }
| ^
(insn 49 46 50 8 (set (subreg:SI (reg:DI 186) 0)
(xor:SI (subreg:SI (reg:DI 159 [ vect__4.16 ]) 0)
(subreg:SI (reg:V1DI 166 [ vect__4.13 ]) 0))) -1
(nil))
during RTL pass: vregs
xuzg2b9u.c:15:1: internal compiler error: in extract_insn, at recog.c:2305
0x61928f _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/var/tmp/portage/cross-powerpc-e500v2-linux-gnuspe/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/rtl-error.c:108
0x6192ad _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/var/tmp/portage/cross-powerpc-e500v2-linux-gnuspe/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/rtl-error.c:116
0x6177ca extract_insn(rtx_insn*)
/var/tmp/portage/cross-powerpc-e500v2-linux-gnuspe/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/recog.c:2305
0x9f5392 instantiate_virtual_regs_in_insn
/var/tmp/portage/cross-powerpc-e500v2-linux-gnuspe/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/function.c:1605
0x9f5392 instantiate_virtual_regs
/var/tmp/portage/cross-powerpc-e500v2-linux-gnuspe/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/function.c:1975
0x9f5392 execute
/var/tmp/portage/cross-powerpc-e500v2-linux-gnuspe/gcc-9.0.0_alpha20180819/work/gcc-9-20180819/gcc/function.c:2024
>From gcc-bugs-return-613591-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 03:20:40 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/66970] Add __has_builtin() macro
Date: Fri, 24 Aug 2018 03:20:00 -0000
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--- Comment #10 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to H. Peter Anvin from comment #9)
> Can I please second this request? This would be extremely useful in the
> Linux kernel, *and* it would be extremely useful in any code that for
> whatever reason cannot depend on any particular build system.
Well, it's already been seconded, but you can... seventh it? I dunno, I can't
count.
>From gcc-bugs-return-613592-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 04:29:19 2018
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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/87084] New: Excessive diagnostic messages for invalid use of __builtin_va_arg_pack{,_len}() in a loop
Date: Fri, 24 Aug 2018 04:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87084
Bug ID: 87084
Summary: Excessive diagnostic messages for invalid use of
__builtin_va_arg_pack{,_len}() in a loop
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
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Target Milestone: ---
All gcc versions since the current trunk and down to at least 4.4 emit
redundant diagnostics for each copy of the unrolled loop when compiling the
following snippet w/ -O3 (or -Ofast w/ gcc versions which implement it):
int xc;
void
zp (void)
{
int ta;
for (ta = 0; ta < 8; ++ta)
{
int ij;
for (ij = 0; ij < 17; ++ij)
xc = __builtin_va_arg_pack () /* or __builtin_va_arg_pack_len () */;
}
}
% gcc-9.0.0-alpha20180819 -O3 -c fz5t1wes.c
fz5t1wes.c: In function 'zp':
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
13 | xc = __builtin_va_arg_pack () /* or __builtin_va_arg_pack_len ()
*/;
| ^~~~~~~~~~~~~~~~~~~~~~~~
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
fz5t1wes.c:13:14: error: invalid use of '__builtin_va_arg_pack ()'
I believe the diagnostics should really be emitted only once for the entirety
of zp().
>From gcc-bugs-return-613593-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 04:40:37 2018
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Subject: [Bug other/87084] Excessive diagnostic messages for invalid use of __builtin_va_arg_pack{,_len}() in a loop
Date: Fri, 24 Aug 2018 04:40:00 -0000
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The error happens after some optimization. In this case, it happens after loop
unrolling has happened.
>From gcc-bugs-return-613594-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 04:42:21 2018
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Subject: [Bug tree-optimization/87070] Combine popcount on pieces to a single popcountll
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed. The easiest way to do this is have a simple match.pd pattern but it
will need to handle casts too.
>From gcc-bugs-return-613595-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 04:43:04 2018
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Subject: [Bug tree-optimization/87070] Combine popcount on pieces to a single popcountll
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-24
Ever confirmed|0 |1
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
.
>From gcc-bugs-return-613596-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 06:40:59 2018
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Subject: [Bug bootstrap/87073] go bootstrap failure due to ICE in vr_values::extract_range_from_binary_expr
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Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-24
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--- Comment #4 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Mine.
>From gcc-bugs-return-613597-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 06:58:11 2018
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Subject: [Bug lto/87076] -mpcu/-march not propagated through LTO bytecode (ice/segfault if arch flags do not match)
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--- Comment #1 from Frank Schaefer <kelledin at gmail dot com> ---
Coming from PR87067: binutils suffers badly from this, because the testsuite
apparently honors $CFLAGS but intentionally ignores $LDFLAGS. So even if an
end-user does the right thing and adds consistent "-march=..." to both CFLAGS
and LDFLAGS, this quirk brutally murders all the binutils LTO regression tests
on armv7 and similar.
For my part, I can get around this by adding my "-march=..." flags to $CC/$CXX,
but that's just gross. +1 to auto-propagating these flags through the
bytecode.
>From gcc-bugs-return-613598-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 07:03:06 2018
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Subject: [Bug target/87067] [8.1, 8.2] LTO-related ICE when running armv7 binutils test suite
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Dup then.
*** This bug has been marked as a duplicate of bug 87076 ***
>From gcc-bugs-return-613599-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 07:03:07 2018
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Subject: [Bug lto/87076] -mpcu/-march not propagated through LTO bytecode (ice/segfault if arch flags do not match)
Date: Fri, 24 Aug 2018 07:03:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 87067 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-613600-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 07:07:20 2018
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Subject: [Bug lto/87076] -mpcu/-march not propagated through LTO bytecode (ice/segfault if arch flags do not match)
Date: Fri, 24 Aug 2018 07:07:00 -0000
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
On x86_64 the actual -march switch isn't serialized but it is decomposed into
individual -mFEATURE switches by the driver which are serialized.
That is, if you make sure that
int __attribute__((target("arch=armv7-r"))) foo () {}
works then the way LTO operates should work as well (it moves command-line
flags to individual per-function attributes).
The -march switch also appears in the lto_opts LTO section and should be
handed off to the linker by lto-wrapper as well.
You can check that by looking at -v output of the link command and/or
looking at the lto_opts section in the object files.
>From gcc-bugs-return-613602-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 07:17:20 2018
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From: "chengming at bjuci dot com.cn" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/87085] New: with -march=i386, gcc should not generate code including endbr instruction
Date: Fri, 24 Aug 2018 07:17:00 -0000
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Bug ID: 87085
Summary: with -march=i386, gcc should not generate code
including endbr instruction
Product: gcc
Version: 8.2.1
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My gcc version is gcc (GCC) 8.2.1 20180801 (Red Hat 8.2.1-2), OS is Fedora 28.
I develop program for a CPU called Vortex86 on it. Vortex86 is an x86
artitecture CPU from Taiwan.
My problem is, even a program with only "return 0;", it will cause "Illegal
Instruction" on Vortex86.
Based on dumped core file and objdump, the problem comes from the endbr32
instruction.
Even though I add the -march=i386 and -fcf-protection=none option, it still
output endbr32 instruction.
So I think it's a bug. Because i386 CPU didn't support endbr32 instruction. If
I specified -march=i386, it should not generate endbr32 instruction.
There is no such problem on GCC 7 and below.
Thanks.
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Subject: [Bug c++/87072] [6/7 Regression] g++6.2.0 false warning: array subscript is above array bounds, with misleading line number
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[Bug 56456] [meta-bug] bogus/missing -Warray-bounds
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Subject: [Bug bootstrap/87073] go bootstrap failure due to ICE in vr_values::extract_range_from_binary_expr
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #2)
> (In reply to Martin Sebor from comment #1)
> > I wonder if it's related to pr87059.
>
> No, not related.
>
> Reproduced with a stage1 compiler just with --disable-multilib and
> --enable-languages=go and make all-target-libgo.
>
> This one's entirely my fault. For all my whining about Ada, I should really
> start testing go and ada for all my VRP changes :-/.
I always use --enable-languages=all ;) (that just forgets jit ;)
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Subject: [Bug tree-optimization/87074] [8/9 Regression] Vectorization bug: O3 result differ from O2
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-*-*, i?86-*-*
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Keywords| |needs-bisection, wrong-code
Last reconfirmed| |2018-08-24
CC| |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
Summary|Vectorization bug: O3 |[8/9 Regression]
|result differ from O2 |Vectorization bug: O3
| |result differ from O2
Target Milestone|--- |8.3
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. Doesn't seem to be vectorization but -fno-tree-loop-optimize
"fixes" it.
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Subject: [Bug c++/87075] [7/8/9 Regression] ICE when compiling the test suite of GLM 0.9.9.0
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Subject: [Bug testsuite/87078] [9 regression] gcc.dg/vect/slp-37.c begins failing with r263772
Date: Fri, 24 Aug 2018 07:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87078
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target Milestone|--- |9.0
>From gcc-bugs-return-613606-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 07:27:02 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87077] missed optimization for horizontal add for x86 SSE
Date: Fri, 24 Aug 2018 07:27:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |x86_64-*-*, i?86-*-*
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-08-24
CC| |rguenth at gcc dot gnu.org
Blocks| |53947
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Can you attach the source please? These stupid Web 2.0 sites do not allow to
save it to a file.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/87081] [9 regression] gcc.target/powerpc/vec-init-6.c failures with r262930
Date: Fri, 24 Aug 2018 07:29:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
>From gcc-bugs-return-613609-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 07:33:54 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87084] Excessive diagnostic messages for invalid use of __builtin_va_arg_pack{,_len}() in a loop
Date: Fri, 24 Aug 2018 07:33:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-24
Component|other |c
Version|unknown |8.2.1
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's because of
rtx
expand_builtin (tree exp, rtx target, rtx subtarget, machine_mode mode,
int ignore)
{
...
case BUILT_IN_VA_ARG_PACK:
/* All valid uses of __builtin_va_arg_pack () are removed during
inlining. */
error ("%Kinvalid use of %<__builtin_va_arg_pack ()%>", exp);
return const0_rtx;
case BUILT_IN_VA_ARG_PACK_LEN:
/* All valid uses of __builtin_va_arg_pack_len () are removed during
inlining. */
error ("%Kinvalid use of %<__builtin_va_arg_pack_len ()%>", exp);
return const0_rtx;
and diagnostics of valid/invalid uses of these builtins should really happen
in the FE (they may be only used in variadic functions and those functions
need to be marked always-inline either by the user or the frontend).
So - marking as C-family FE bug. We should reject this testcase and
the above code should be changed to ICE.
>From gcc-bugs-return-613610-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 07:41:24 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/87065] [7/8/9 Regression] combine causes ICE in trunc_int_for_mode
Date: Fri, 24 Aug 2018 07:41:00 -0000
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--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's combines known_cond:
Breakpoint 6, known_cond (x=0x7ffff6a65198, cond=EQ, reg=0x7ffff6a3fa20,
val=0x7ffff6a47930) at /space/rguenther/src/gcc-sccvn/gcc/combine.c:9468
9468 enum rtx_code code = GET_CODE (x);
(gdb) p debug_rtx (x)
(eq:V4SI (reg:V4SI 127 [ vect__6.22 ])
(reg:V4SI 162))
$13 = void
(gdb) p debug_rtx (reg)
(reg:V4SI 127 [ vect__6.22 ])
$14 = void
(gdb) p debug_rtx (val)
(reg:V4SI 162)
...
9517 if (comparison_dominates_p (cond, code))
(gdb)
9518 return const_true_rtx;
neither uses of const_true_rtx nor const0_rtx are correct here. Simplest
solution is to fend off all non-integer compares (mode of x) or to use
appropriately moded results (vector true is {-1, -1 ... }).
>From gcc-bugs-return-613611-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 07:46:45 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87085] with -march=i386, gcc should not generate code including endbr instruction
Date: Fri, 24 Aug 2018 07:46:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hjl at gcc dot gnu.org
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, AFAIK endbr32 should just be a nop. But -fcf-protection=none should work.
I guess your GCC was configured to enable cf-protection by default and somehow
that interferes... HJ?
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86993] [6/7/8/9 Regression] assignment of read-only variable error reported at wrong location
Date: Fri, 24 Aug 2018 07:51:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 44588
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44588&action=edit
gcc9-pr86993.patch
Untested fix, maybe some tests in the testsuite will need small adjustments
too.
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From: "aldyh at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/87073] go bootstrap failure due to ICE in vr_values::extract_range_from_binary_expr
Date: Fri, 24 Aug 2018 08:07:00 -0000
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--- Comment #6 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Author: aldyh
Date: Fri Aug 24 08:06:06 2018
New Revision: 263828
URL: https://gcc.gnu.org/viewcvs?rev=263828&root=gcc&view=rev
Log:
PR 87073/bootstrap
* wide-int-range.cc (wide_int_range_div): Do not ignore result
from wide_int_range_multiplicative_op.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/wide-int-range.cc
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Subject: [Bug bootstrap/87073] go bootstrap failure due to ICE in vr_values::extract_range_from_binary_expr
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87073
Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #7 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Fixed.
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From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87086] New: [9 Regression] ICE in canonize from wide-int.cc when building SPEC2000 254.gap
Date: Fri, 24 Aug 2018 08:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87086
Bug ID: 87086
Summary: [9 Regression] ICE in canonize from wide-int.cc when
building SPEC2000 254.gap
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: ktkachov at gcc dot gnu.org
CC: aldyh at gcc dot gnu.org
Target Milestone: ---
I'm getting an ICE when building gap from SPEC2000 on aarch64-none-linux-gnu.
The reduced testcase is:
int a, b;
void fn1 () { b == 0 || a / b; }
built with -O2 -fno-strict-overflow. Without -fno-strict-overflow it doesn't
ICE.
The benchmark ICEs in set_value_range, at tree-vrp.c:289
whereas the testcase segfaults with:
0xbf50e5 crash_signal
$SRC/gcc/toplev.c:325
0xf6a482 canonize
$SRC/gcc/wide-int.cc:96
0xf6ac38 wi::force_to_size(long*, long const*, unsigned int, unsigned int,
unsigned int, signop)
$SRC/gcc/wide-int.cc:386
0xefed1d wide_int_storage::from(generic_wide_int<wide_int_ref_storage<false,
true> > const&, unsigned int, signop)
$SRC/gcc/wide-int.h:1151
0xefed1d wide_int_to_tree_1
$SRC/gcc/tree.c:1494
0xeff697 wide_int_to_tree(tree_node*, poly_int<2u,
generic_wide_int<wide_int_ref_storage<false, true> > > const&)
$SRC/gcc/tree.c:1676
0xedefe0 extract_range_from_binary_expr_1(value_range*, tree_code, tree_node*,
value_range*, value_range*)
$SRC/gcc/tree-vrp.c:1675
0xedd9e2 extract_range_from_binary_expr_1(value_range*, tree_code, tree_node*,
value_range*, value_range*)
$SRC/gcc/tree-vrp.c:1373
0xf5d110 vr_values::extract_range_from_binary_expr(value_range*, tree_code,
tree_node*, tree_node*, tree_node*)
$SRC/gcc/vr-values.c:768
0xf6225d vr_values::extract_range_from_assignment(value_range*, gassign*)
$SRC/gcc/vr-values.c:1432
0xf62438 vr_values::vrp_visit_assignment_or_call(gimple*, tree_node**,
value_range*)
$SRC/gcc/vr-values.c:2048
0xf624e5 vr_values::extract_range_from_stmt(gimple*, edge_def**, tree_node**,
value_range*)
$SRC/gcc/vr-values.c:2744
0x138d508 evrp_range_analyzer::record_ranges_from_stmt(gimple*, bool)
$SRC/gcc/gimple-ssa-evrp-analyze.c:293
0x138b6bf evrp_dom_walker::before_dom_children(basic_block_def*)
$SRC/gcc/gimple-ssa-evrp.c:139
0x1364517 dom_walker::walk(basic_block_def*)
$SRC/gcc/domwalk.c:353
0x138c05c execute_early_vrp
$SRC/gcc/gimple-ssa-evrp.c:310
0x138c05c execute
$SRC/gcc/gimple-ssa-evrp.c:347
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
This appeared very recently, I believe it's one of the new range work.
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Subject: [Bug tree-optimization/87086] [9 Regression] ICE in canonize from wide-int.cc when building SPEC2000 254.gap
Date: Fri, 24 Aug 2018 08:50:00 -0000
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ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
Known to fail| |9.0
>From gcc-bugs-return-613617-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 08:58:11 2018
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From: "aldyh at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
Date: Fri, 24 Aug 2018 08:58:00 -0000
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--- Comment #8 from Aldy Hernandez <aldyh at redhat dot com> ---
On 08/23/2018 04:08 PM, msebor at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87059
>
> --- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
> The MIN_EXPR code predates my change -- r255898 just moved indentation. Based
> on past experience I would assume MIN_EXPR to need the same types. The code in
> expand_builtin_strncmp mixes ssizetype and sizetype:
>
> len1 = c_strlen (arg1, 1); // returns ssizetype
> len2 = c_strlen (arg2, 1);
>
> if (len1)
> len1 = size_binop_loc (loc, PLUS_EXPR, ssize_int (1), len1);
> if (len2)
> len2 = size_binop_loc (loc, PLUS_EXPR, ssize_int (1), len2);
>
> len3 = fold_convert_loc (loc, sizetype, arg3);
> ...
> if (len != len3)
> len = fold_build2_loc (loc, MIN_EXPR, TREE_TYPE (len), len, len3);
>
> So the fix is presumably to change len3 to
>
> len3 = fold_convert_loc (loc, ssizetype, arg3);
>
> Given the difference between sizetype and ssizetype is just one 's' it seems
> like an easy mistake to make. If MIN_EXPR does, in fact, require arguments of
> the same type then adding an assertion to fold_binary_loc() to verify it would
> help expose these mistakes early. I'm not sure what the right predicate is to
> use in the assertion. Just compare TYPE_MAIN_VARIANT of the two argument types
> for equality?
>
Thanks.
Testing the following:
gcc/
PR 87059/tree-optimization
* builtins.c (expand_builtin_strncmp): Pass signed sizetype to
fold_convert_loc.
diff --git a/gcc/builtins.c b/gcc/builtins.c
index b1a79f3f33f..7113d19aadf 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -4727,7 +4727,7 @@ expand_builtin_strncmp (tree exp, ATTRIBUTE_UNUSED
rtx target,
if (len2)
len2 = size_binop_loc (loc, PLUS_EXPR, ssize_int (1), len2);
- tree len3 = fold_convert_loc (loc, sizetype, arg3);
+ tree len3 = fold_convert_loc (loc, ssizetype, arg3);
/* If we don't have a constant length for the first, use the length
of the second, if we know it. If neither string is constant length,
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
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Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ktkachov at gcc dot gnu.org
--- Comment #9 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
*** Bug 87086 has been marked as a duplicate of this bug. ***
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87086] [9 Regression] ICE in canonize from wide-int.cc when building SPEC2000 254.gap
Date: Fri, 24 Aug 2018 08:59:00 -0000
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Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Duplicate.
*** This bug has been marked as a duplicate of bug 87059 ***
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
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--- Comment #10 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #7)
> So the fix is presumably to change len3 to
>
> len3 = fold_convert_loc (loc, ssizetype, arg3);
>
> Given the difference between sizetype and ssizetype is just one 's' it seems
> like an easy mistake to make. If MIN_EXPR does, in fact, require arguments
> of the same type then adding an assertion to fold_binary_loc() to verify it
> would help expose these mistakes early. I'm not sure what the right
> predicate is to use in the assertion. Just compare TYPE_MAIN_VARIANT of the
> two argument types for equality?
Martin, sorry to drag you into this. I didn't notice your change was just an
indentation change.
Also, thanks for the hint above.
I'm testing the following which seems to fix them problem:
gcc/
PR 87059/tree-optimization
* builtins.c (expand_builtin_strncmp): Pass signed sizetype to
fold_convert_loc.
diff --git a/gcc/builtins.c b/gcc/builtins.c
index b1a79f3f33f..7113d19aadf 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -4727,7 +4727,7 @@ expand_builtin_strncmp (tree exp, ATTRIBUTE_UNUSED rtx
target,
if (len2)
len2 = size_binop_loc (loc, PLUS_EXPR, ssize_int (1), len2);
- tree len3 = fold_convert_loc (loc, sizetype, arg3);
+ tree len3 = fold_convert_loc (loc, ssizetype, arg3);
/* If we don't have a constant length for the first, use the length
of the second, if we know it. If neither string is constant length,
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/combine.c.jj 2018-08-24 08:55:25.000000000 +0200
+++ gcc/combine.c 2018-08-24 11:00:01.974006314 +0200
@@ -6495,7 +6495,7 @@ simplify_if_then_else (rtx x)
pc_rtx, pc_rtx, 0, 0, 0);
if (reg_mentioned_p (from, false_rtx))
false_rtx = subst (known_cond (copy_rtx (false_rtx), false_code,
- from, false_val),
+ from, false_val),
pc_rtx, pc_rtx, 0, 0, 0);
SUBST (XEXP (x, 1), swapped ? false_rtx : true_rtx);
@@ -9515,12 +9515,13 @@ known_cond (rtx x, enum rtx_code cond, r
if (COMPARISON_P (x))
{
if (comparison_dominates_p (cond, code))
- return const_true_rtx;
+ return (VECTOR_MODE_P (GET_MODE (x))
+ ? CONSTM1_RTX (GET_MODE (x)) : const_true_rtx);
code = reversed_comparison_code (x, NULL);
if (code != UNKNOWN
&& comparison_dominates_p (cond, code))
- return const0_rtx;
+ return CONST0_RTX (GET_MODE (x));
else
return x;
}
@@ -9563,7 +9564,7 @@ known_cond (rtx x, enum rtx_code cond, r
/* We must simplify subreg here, before we lose track of the
original inner_mode. */
new_rtx = simplify_subreg (GET_MODE (x), r,
- inner_mode, SUBREG_BYTE (x));
+ inner_mode, SUBREG_BYTE (x));
if (new_rtx)
return new_rtx;
else
@@ -9588,7 +9589,7 @@ known_cond (rtx x, enum rtx_code cond, r
/* We must simplify the zero_extend here, before we lose
track of the original inner_mode. */
new_rtx = simplify_unary_operation (ZERO_EXTEND, GET_MODE (x),
- r, inner_mode);
+ r, inner_mode);
if (new_rtx)
return new_rtx;
else
fixes the ICE, but there are other latent issues.
>From gcc-bugs-return-613622-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 09:12:58 2018
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Subject: [Bug web/87050] Bump wwwdocs to html5
Date: Fri, 24 Aug 2018 09:12:00 -0000
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--- Comment #4 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Sure, I can chip in a little, though I'm no html expert. Do you have some
branch somewhere where you're working, or?
>From gcc-bugs-return-613623-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 09:31:22 2018
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Subject: [Bug testsuite/87064] [9 regression] libgomp.oacc-fortran/reduction-3.f90 fails starting with r263751
Date: Fri, 24 Aug 2018 09:31:00 -0000
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--- Comment #4 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Well, that is, ahem, interesting. So it seems that OACC does the vector_length
reduction incorrectly; the correct result is obviously 10.0 and not 9.0 which
then causes the failure.
I'm a bit lost why that might happen, but in the time-honored fashion of
shifting blame I suggest this is some latent bug in OACC rather than a bug in
r263751.
>From gcc-bugs-return-613624-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 10:00:57 2018
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Subject: [Bug rtl-optimization/87047] [7/8/9 Regression] performance regression because of if-conversion
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Treating the missing else cost as 0 cost isn't right either, it is ok to accept
some small cost, otherwise we wouldn't do the if conversion ever with missing
else_bb.
The thing is that it needs to be small enough.
Do we need some new target magic constant for this, or do we just use cost of a
few (say 4-5) moves or something similar?
>From gcc-bugs-return-613625-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 10:35:44 2018
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Subject: [Bug middle-end/87041] [8/9 Regression] GCC 8 regression: -Wformat "reading through null pointer" on unreachable code
Date: Fri, 24 Aug 2018 10:35:00 -0000
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That change just improved the constant folding.
In C++ which has done that constant folding forever we don't warn, because
check_format_arguments is called with the non-folded original arguments
(though,
before delayed folding - r217814 - C++ warned about this).
Though, for this case I'd think it is a good think to warn about
const char *const p = NULL;
printf ("%s\n", p);
My suggestion is if you don't want this warning don't use const on the
variables, it doesn't improve the generated code when optimizing, so the only
advantage of it is making sure you inside of the macro don't try to change the
value of the variables.
>From gcc-bugs-return-613626-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 10:49:13 2018
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Subject: [Bug tree-optimization/87087] New: Optimization hangs up and consumes over 15Gb of memory
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Bug ID: 87087
Summary: Optimization hangs up and consumes over 15Gb of memory
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Reproduction (after creduce, sorry for that code):
b;
d;
e() {
unsigned f;
unsigned g;
int h;
long i = 901380;
for (;;) {
d = 0;
for (; d; d++) {
h = 50126706678236;
f = 0;
for (; f < 15; f += 3) {
g = 0;
for (; g < 9; g++)
b = h = i - (h << 5) + h;
}
}
i = 0;
}
}
Compiler:
> gcc -v
Reading specs from
/apps/gcc/8.1.0/.bin/../lib64/gcc/x86_64-suse-linux/8.1.0/specs
COLLECT_GCC=/apps/gcc/8.1.0/.bin/gcc
COLLECT_LTO_WRAPPER=/apps/gcc/8.1.0/.bin/../libexec/gcc/x86_64-suse-linux/8.1.0/lto-wrapper
Target: x86_64-suse-linux
Configured with: ./configure --prefix=/apps/gcc/8.1.0
--libdir=/apps/gcc/8.1.0/lib64 --libexecdir=/apps/gcc/8.1.0/libexec
--bindir=/apps/gcc/8.1.0/bin --with-isl=/apps/gcc/8.1.0
--with-libelf=/apps/gcc/8.1.0 --with-mpfr=/apps/gcc/8.1.0
--with-gmp=/apps/gcc/8.1.0 --with-mpc=/apps/gcc/8.1.0
--disable-gnu-unique-object --enable-gold=yes --enable-lto
--enable-languages=c,c++,objc,fortran --build=x86_64-suse-linux
--host=x86_64-suse-linux --target=x86_64-suse-linux --enable-libotm
--disable-multilib --disable-bootstrap --disable-libstdcxx-pch
Thread model: posix
gcc version 8.1.0 (GCC)
Try to compile like this:
> gcc -O3 test.c
You will see compiler hanging up and eating all of memory.
> gcc -O2 test.c
This passes ok.
>From gcc-bugs-return-613627-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 10:50:04 2018
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Subject: [Bug target/86989] ICE in rs6000_output_addr_const_extra, at config/rs6000/rs6000.c:20994
Date: Fri, 24 Aug 2018 10:50:00 -0000
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--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Fri Aug 24 10:49:27 2018
New Revision: 263829
URL: https://gcc.gnu.org/viewcvs?rev=263829&root=gcc&view=rev
Log:
rs6000: Check that the base of a TOCREL is the TOC (PR86989)
There currently is nothing that prevents replacing the TOC_REGISTER in
a TOCREL unspec with something else, like a pseudo, or a memory ref.
This of course does not work. Fix that.
Tested on powerpc64-linux {-m32,-m64}; committing.
Segher
2018-08-24 Segher Boessenkool <segher@kernel.crashing.org>
PR target/86989
* config/rs6000/rs6000.c (toc_relative_expr_p): Check that the base is
the TOC register.
---
gcc/config/rs6000/rs6000.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index a967912..ed33912 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -7932,7 +7932,9 @@ toc_relative_expr_p (const_rtx op, bool strict, const_rtx
*tocrel_base_ret,
*tocrel_offset_ret = tocrel_offset;
return (GET_CODE (tocrel_base) == UNSPEC
- && XINT (tocrel_base, 1) == UNSPEC_TOCREL);
+ && XINT (tocrel_base, 1) == UNSPEC_TOCREL
+ && REG_P (XVECEXP (tocrel_base, 0, 1))
+ && REGNO (XVECEXP (tocrel_base, 0, 1)) == TOC_REGISTER);
}
/* Return true if X is a constant pool address, and also for cmodel=medium
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Subject: [Bug c++/87088] New: Attached program doesn't finish compiling and linking
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Created attachment 44589
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44589&action=edit
Output from win_flex
C:\parser>g++ -Xpreprocessor "C:\MinGW\msys\1.0\include\FlexLexer.h" lex.yy.cc
lex.yy.cc:1:0: fatal error: inter-module optimizations not implemented for C++
#line 2 "lex.yy.cc"
compilation terminated.
========================================================= g++ -v:
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-pc-cygwin/5.4.0/lto-wrapper.exe
Target: i686-pc-cygwin
Configured with:
/cygdrive/i/szsz/tmpp/gcc/gcc-5.4.0-1.i686/src/gcc-5.4.0/configure
--srcdir=/cygdrive/i/szsz/tmpp/gcc/gcc-5.4.0-1.i686/src/gcc-5.4.0 --prefix=/usr
--exec-prefix=/usr --localstatedir=/var --sysconfdir=/etc
--docdir=/usr/share/doc/gcc --htmldir=/usr/share/doc/gcc/html -C
--build=i686-pc-cygwin --host=i686-pc-cygwin --target=i686-pc-cygwin
--without-libiconv-prefix --without-libintl-prefix --libexecdir=/usr/lib
--enable-shared --enable-shared-libgcc --enable-static
--enable-version-specific-runtime-libs --enable-bootstrap --enable-__cxa_atexit
--with-dwarf2 --with-arch=i686 --with-tune=generic --disable-sjlj-exceptions
--enable-languages=ada,c,c++,fortran,java,lto,objc,obj-c++ --enable-graphite
--enable-threads=posix --enable-libatomic --enable-libcilkrts --enable-libgomp
--enable-libitm --enable-libquadmath --enable-libquadmath-support
--enable-libssp --enable-libada --enable-libjava --enable-libgcj-sublibs
--disable-java-awt --disable-symvers --with-ecj-jar=/usr/share/java/ecj.jar
--with-gnu-ld --with-gnu-as --with-cloog-include=/usr/include/cloog-isl
--without-libiconv-prefix --without-libintl-prefix --with-system-zlib
--enable-linker-build-id --with-default-libstdcxx-abi=gcc4-compatible
Thread model: posix
gcc version 5.4.0 (GCC)
>From gcc-bugs-return-613629-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 11:02:42 2018
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From: "miltonkbenjamin at verizon dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87088] Attached program doesn't finish compiling and linking
Date: Fri, 24 Aug 2018 11:02:00 -0000
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--- Comment #1 from miltonkbenjamin <miltonkbenjamin at verizon dot net> ---
Thanks for your support
Best,
Milt
>From gcc-bugs-return-613630-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 11:06:18 2018
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From: "anon63 at protonmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87028] false positive -Wstringop-truncation strncpy with global variable source string
Date: Fri, 24 Aug 2018 11:06:00 -0000
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--- Comment #6 from anon63 <anon63 at protonmail dot com> ---
Dear Martin,
Thank you for all these details.
Well, re-reading what I wrote in Comment 0, I think I should explain what I
meant by "Lots of codebases can't be compiled with -Werror flag now.".
Since the gcc-7 -> gcc-8 transition on my laptop, I see a lot of these warnings
(and a Google search on -Wstringop-truncation gives lots of results for 2018)
but I'm working on a project where security matters (IoT OS) and we use -Werror
on Travis-CI but that does not reflect accurately the common case. My
assumption "Lots of codebases can't be compiled with -Werror flag now." was not
"I have seen lots of codebases where the build fails" but rather "It will not
be easy for those projects to use more strict CFLAGS in a next future". I am
not a distribution packages maintainer so I am probably not the right person
for an informed point of view.
Anyway, thanks a lot for your time. As I was more interested by the
global/local variable case than by the constant case, I think I will go for
something strange like this :
////////////////////////////////////////////////////////
char *strncpy (char *, const char *, __SIZE_TYPE__);
struct S {
char dest[5];
};
const char src[] = "1234567890";
void function(struct S *s)
{
const char *src2=src; // this indirection avoids a gcc
>= 8
strncpy(s->dest,src2,sizeof(s->dest)-1); // false positive
stringop-truncation warning
s->dest[sizeof(s->dest)-1]='\0';
}
////////////////////////////////////////////////////////
and the indirection doesn't change the assembly :
////////////////////////////////////////////////////////
gcc -O2 -Wall -Wextra -c a.c && objdump -d a.o
a.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <function>:
0: c7 07 31 32 33 34 movl $0x34333231,(%rdi)
6: c6 47 04 00 movb $0x0,0x4(%rdi)
a: c3 retq
////////////////////////////////////////////////////////
Best,
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87087] [8/9 Regression] Optimization hangs up and consumes over 15Gb of memory
Date: Fri, 24 Aug 2018 11:08:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|UNCONFIRMED |ASSIGNED
Known to work| |7.3.1
Keywords| |compile-time-hog,
| |needs-bisection
Last reconfirmed| |2018-08-24
CC| |mliska at suse dot cz
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
Summary|Optimization hangs up and |[8/9 Regression]
|consumes over 15Gb of |Optimization hangs up and
|memory |consumes over 15Gb of
| |memory
Target Milestone|--- |8.3
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. Another case hanging in SCEV stuff. This time in cunrolli.
It might be caused by my removal of some complexity backoff ...
Martin, can you confirm that?
Eventually caching isn't working too good either so we do very many times
the same thing (infer_loop_bounds_from_undefined). Seemed to work fine
in GCC 7 for whatever reason (not unrolling so much I guess).
I will have a look.
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87087] [8 Regression] Optimization hangs up and consumes over 15Gb of memory
Date: Fri, 24 Aug 2018 11:09:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |9.0
Summary|[8/9 Regression] |[8 Regression] Optimization
|Optimization hangs up and |hangs up and consumes over
|consumes over 15Gb of |15Gb of memory
|memory |
Known to fail| |8.1.0, 8.2.1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Trunk seems fine as well.
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87088] Attached program doesn't finish compiling and linking
Date: Fri, 24 Aug 2018 11:10:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to miltonkbenjamin from comment #0)
> Created attachment 44589 [details]
> Output from win_flex
>
> C:\parser>g++ -Xpreprocessor "C:\MinGW\msys\1.0\include\FlexLexer.h"
> lex.yy.cc
-Xpreprocessor passes an option to the preprocessor, but you're giving it a
filename.
Are you trying to have that file included?
That would be -include "C:\MinGW\msys\1.0\include\FlexLexer.h"
Also, GCC 5.4.0 is not supported, the oldest supported release is 6.4.0
>From gcc-bugs-return-613635-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 11:17:46 2018
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From: "dimhen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/87089] New: [9 regression] tree check: expected class 'type', have 'declaration' (namespace_decl) in type_with_linkage_p, at ipa-utils.h
Date: Fri, 24 Aug 2018 11:17:00 -0000
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Bug ID: 87089
Summary: [9 regression] tree check: expected class 'type', have
'declaration' (namespace_decl) in type_with_linkage_p,
at ipa-utils.h
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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Reporter: dimhen at gmail dot com
CC: marxin at gcc dot gnu.org
Target Milestone: ---
r263651 PASS
r263798 FAIL
$ g++ -fpreprocessed -O2 -fno-semantic-interposition -flto -fPIC -DPIC -c -o
a.o a.ii
$ g++ -fpreprocessed -O2 -fno-semantic-interposition -flto -fPIC -DPIC -c -o
b.o b.ii
$ g++ -flto -fPIC -DPIC -shared a.o b.o
b.ii:6:9: warning: type 'struct d' violates the C++ One Definition Rule [-Wodr]
6 | struct d : a{} * b;
| ^
a.ii:2:8: note: a type with different bases is defined in another translation
unit
2 | struct d {
| ^
during IPA pass: pure-const
lto1: internal compiler error: tree check: expected class 'type', have
'declaration' (namespace_decl) in type_with_linkage_p, at ipa-utils.h:182
0x6eb2cb tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
/home/dimhen/src/gcc_current/gcc/tree.c:9420
0xb0e697 tree_class_check(tree_node const*, tree_code_class, char const*, int,
char const*)
/home/dimhen/src/gcc_current/gcc/tree.h:3499
0xb0e697 type_with_linkage_p(tree_node const*)
/home/dimhen/src/gcc_current/gcc/ipa-utils.h:182
0xb0e6fd type_in_anonymous_namespace_p(tree_node const*)
/home/dimhen/src/gcc_current/gcc/ipa-utils.h:215
0xb0555a maybe_record_node
/home/dimhen/src/gcc_current/gcc/ipa-devirt.c:2396
0xb0bd6c possible_polymorphic_call_targets(tree_node*, long,
ipa_polymorphic_call_context, bool*, void**, bool)
/home/dimhen/src/gcc_current/gcc/ipa-devirt.c:3205
0xb423da possible_polymorphic_call_targets(cgraph_edge*, bool*, void**, bool)
/home/dimhen/src/gcc_current/gcc/ipa-utils.h:116
0xb423da walk_polymorphic_call_targets
/home/dimhen/src/gcc_current/gcc/ipa.c:171
0xb44b40 symbol_table::remove_unreachable_nodes(_IO_FILE*)
/home/dimhen/src/gcc_current/gcc/ipa.c:418
0x879c32 read_cgraph_and_symbols
/home/dimhen/src/gcc_current/gcc/lto/lto.c:3016
0x879c32 lto_main()
/home/dimhen/src/gcc_current/gcc/lto/lto.c:3400
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
lto-wrapper: fatal error: /usr/local/gcc_current/bin/g++ returned 1 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
$ cat a.ii
namespace A {
struct d {
~d();
};
d::~d() {}
}
$ cat b.ii
class a {
protected:
virtual ~a();
};
namespace A {
struct d : a{} * b;
void c() { b->~d(); }
}
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Subject: [Bug tree-optimization/87086] [9 Regression] ICE in canonize from wide-int.cc when building SPEC2000 254.gap
Date: Fri, 24 Aug 2018 11:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87086
--- Comment #2 from ktkachov at gcc dot gnu.org ---
(In reply to Aldy Hernandez from comment #1)
> Duplicate.
>
> *** This bug has been marked as a duplicate of bug 87059 ***
Are you sure this is a dup? PR 87059 seems to be about strncmp whereas this has
to do with -fno-strict-overflow
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Subject: [Bug preprocessor/87088] Attached program doesn't finish compiling and linking
Date: Fri, 24 Aug 2018 11:18:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Component|c++ |preprocessor
Version|5.4.0 |9.0
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
N.B. releases from the GCC 8.x series gives a more helpful error message:
cc1plus: error: too many filenames given. Type cc1plus --help for usage
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From: "jeanmichael.celerier at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87090] New: Constexpr variables in functions are not optimized correctly
Date: Fri, 24 Aug 2018 11:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87090
Bug ID: 87090
Summary: Constexpr variables in functions are not optimized
correctly
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jeanmichael.celerier at gmail dot com
Target Milestone: ---
Consider the following code :
#include <string_view>
#include <array>
struct Table
{
long long tab[128];
constexpr Table()
: tab {}
{
tab['0'] = 0;
tab['1'] = 1;
tab['2'] = 2;
tab['3'] = 3;
tab['4'] = 4;
tab['5'] = 5;
tab['6'] = 6;
tab['7'] = 7;
tab['8'] = 8;
tab['9'] = 9;
tab['a'] = 10;
tab['A'] = 10;
tab['b'] = 11;
tab['B'] = 11;
tab['c'] = 12;
tab['C'] = 12;
tab['d'] = 13;
tab['D'] = 13;
tab['e'] = 14;
tab['E'] = 14;
tab['f'] = 15;
tab['F'] = 15;
}
constexpr auto operator[](const std::size_t idx) const { return tab[idx];
}
} constexpr t;
constexpr auto conv(std::size_t number)
{
return t[number];
}
std::array<long long, 4> res;
void convert(std::string_view hex)
{
res[0] = (conv(hex[1]));
res[1] = (conv(hex[3]));
res[2] = (conv(hex[5]));
res[3] = (conv(hex[7]));
}
When benchmarking it (calling the `convert("#00ABCDEF")` function a few million
times from another translation unit), I get the following numbers consistently
:
g++-8.2.0 : 8-9 nanoseconds per call
clang++-6.0.1 : 8-10 nanoseconds per call
Now, if I want to put the table inside the conv function to keep it in a small
scope, such as this :
constexpr auto conv(std::size_t number)
{
struct Table
{
long long tab[128];
constexpr Table()
: tab {}
{
tab['0'] = 0;
tab['1'] = 1;
tab['2'] = 2;
tab['3'] = 3;
tab['4'] = 4;
tab['5'] = 5;
tab['6'] = 6;
tab['7'] = 7;
tab['8'] = 8;
tab['9'] = 9;
tab['a'] = 10;
tab['A'] = 10;
tab['b'] = 11;
tab['B'] = 11;
tab['c'] = 12;
tab['C'] = 12;
tab['d'] = 13;
tab['D'] = 13;
tab['e'] = 14;
tab['E'] = 14;
tab['f'] = 15;
tab['F'] = 15;
}
constexpr auto operator[](const std::size_t idx) const { return
tab[idx]; }
} constexpr t;
return t[number];
}
I get the following numbers :
clang++-6.0.1 : 8-10 nanoseconds per call (no changes)
g++-8.2.0 : 120-150 nanoseconds per call, more than ten times slower !
I tested for both compiles at -O2 and -O3 without observable changes.
If I make the "conv" function itself non-constexpr, and mark the table as
static constexpr, I get my performance back - I guess that even while constexpr
the table must be initialized each time ?
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Subject: [Bug preprocessor/87088] Attached program doesn't finish compiling and linking
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
FWIW this was changed by r247222
2017-04-25 Bernd Edlinger
* c-common.c (c_type_hasher, type_hash_table): Remove.
(c_common_get_alias_set): Remove unreachable code.
* c-opts.c (c_common_post_options): Make sure cc1 takes only one file.
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Subject: [Bug debug/79342] [6 Regression] ICE in output_index_string, at dwarf2out.c:25635 with -gsplit-dwarf
Date: Fri, 24 Aug 2018 11:29:00 -0000
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--- Comment #10 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Fri Aug 24 11:28:40 2018
New Revision: 263831
URL: https://gcc.gnu.org/viewcvs?rev=263831&root=gcc&view=rev
Log:
DWARF: Call set_indirect_string on DW_MACINFO_start_file
Since -gsplit-dwarf -g3 will output filename as indirect string, call
set_indirect_string on DW_MACINFO_start_file for -gsplit-dwarf -g3.
gcc/
PR debug/79342
* dwarf2out.c (save_macinfo_strings): Call set_indirect_string
on DW_MACINFO_start_file for -gsplit-dwarf -g3.
gcc/testsuite/
PR debug/79342
* gcc.dg/pr79342.: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr79342.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
trunk/gcc/testsuite/ChangeLog
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87085] with -march=i386, gcc should not generate code including endbr instruction
Date: Fri, 24 Aug 2018 11:31:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-08-24
CC|hjl at gcc dot gnu.org |hjl.tools at gmail dot com
Ever confirmed|0 |1
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to chengming from comment #0)
>
> Even though I add the -march=i386 and -fcf-protection=none option, it still
> output endbr32 instruction.
>
Please provide a testcase.
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Subject: [Bug target/86989] ICE in rs6000_output_addr_const_extra, at config/rs6000/rs6000.c:20994
Date: Fri, 24 Aug 2018 11:32:00 -0000
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--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Fixed on trunk; backports pending.
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Subject: [Bug c/66970] Add __has_builtin() macro
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--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to felix from comment #7)
> I made the feature closely mimic The Other Compiler's behaviour: only
> function built-ins are recognised. This includes generic functions like
> __builtin_add_overflow and C library functions specially handled by the
> front-end like printf (unless -fno-builtin is used), but excludes types like
> __builtin_va_list and function-like constructs (implemented as keywords)
> like __builtin_offsetof and __builtin_types_compatible_p. This is not so
> much of a problem for them, since they also provide __has_feature(),
> __has_extension() and __is_identifier() macros.
I hate that behaviour. Having to use !__is_identifier(__builtin_launder) is
confusing (and not just to me, but to developers of LLVM's own libc++, who I've
had to explain the problem to).
But consistency with Clang is probably more important than making __has_builtin
behave sanely.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/87039] [8/9 Regression] DW_OP_fbreg used without a frame base on a C++ code w/ -fopenmp
Date: Fri, 24 Aug 2018 11:38:00 -0000
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think this shows a pretty major bug caused by the early dwarf changes - it
happens too early.
When OpenMP/OpenACC etc. does move_sese_region_to_fn, it duplicates the BLOCK
which is on the boundary and should stay in both parent and child, but the
other BLOCKs are just moved.
With early dwarf, we've already created the DW_TAG_lexical_block for those
blocks and added them under their parent block.
So, either we shouldn't do that during parsing and only create the lexical
blocks with early dwarf at the end of the lowering passes, or
move_sese_region_to_fn needs to use some debug hook that would reparent the
lexical blocks being moved.
Also note that for the omp_fn outlined functions we don't really emit any DWARF
early at all, dwarf2out_function_decl is called only late from
rest_of_handle_final.
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87087] [8 Regression] Optimization hangs up and consumes over 15Gb of memory
Date: Fri, 24 Aug 2018 11:42:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |marxin at gcc dot gnu.org
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed in r260322.
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From: "trashyankes at wp dot pl" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87077] missed optimization for horizontal add for x86 SSE
Date: Fri, 24 Aug 2018 11:43:00 -0000
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--- Comment #3 from trashyankes at wp dot pl ---
(In reply to Richard Biener from comment #2)
> Can you attach the source please? These stupid Web 2.0 sites do not allow
> to save it to a file.
Code:
```
#include <pmmintrin.h>
#include <immintrin.h>
struct alignas(32) Vx
{
float x[4];
};
struct alignas(32) Mx
{
Vx x[4];
};
#define M_COMMON_ATTR() __attribute__ ((target("fma"),
optimize("-ffast-math")))
M_COMMON_ATTR()
Vx mul(const Mx& mtx, const Vx& vec)
{
Vx res;
for (int i = 0; i < 4; ++i)
{
auto r = 0.0f;
for (int j = 0; j < 4; ++j)
{
r += mtx.x[i].x[j] * vec.x[j];
}
res.x[i] = r;
}
return res;
}
M_COMMON_ATTR()
Vx mulSSE(const Mx& mtx, const Vx& vec)
{
Vx res;
auto v0 = _mm_load_ps(vec.x);
auto m0 = _mm_load_ps(mtx.x[0].x);
auto m1 = _mm_load_ps(mtx.x[1].x);
auto m2 = _mm_load_ps(mtx.x[2].x);
auto m3 = _mm_load_ps(mtx.x[3].x);
m0 = _mm_mul_ps(m0, v0);
m1 = _mm_mul_ps(m1, v0);
m2 = _mm_mul_ps(m2, v0);
m3 = _mm_mul_ps(m3, v0);
m0 = _mm_hadd_ps(m0, m1);
m2 = _mm_hadd_ps(m2, m3);
m0 = _mm_hadd_ps(m0, m2);
_mm_store_ps(res.x, m0);
return res;
}
```
`mul` use GCC optimalizer
`mulSSE` use hand written code that I expect from `mul`
I use `optimize("-ffast-math")` to eliminate case where compiler is forbid to
change order of summing (because `(a + b) + c != a + (b + c)`).
Similar with `target("fma")` it needed to enable `_mm_hadd_ps`.
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Subject: [Bug tree-optimization/87087] [8 Regression] Optimization hangs up and consumes over 15Gb of memory
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
... and started with r257441.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/87039] [8/9 Regression] DW_OP_fbreg used without a frame base on a C++ code w/ -fopenmp
Date: Fri, 24 Aug 2018 11:47:00 -0000
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Actually, I think this got broken with PR78363 r244892.
Before that the early_global_decl hooks are only called on the functions when
all the functions are lowered and thus the BLOCKs moved.
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Subject: [Bug c++/87091] New: Malformed fix-it hint for missing header
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Bug ID: 87091
Summary: Malformed fix-it hint for missing header
Product: gcc
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Created attachment 44590
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44590&action=edit
Preprocessed source
With today's trunk the following fails (due to a libstdc++ bug I'm fixing):
#define _GLIBCXX_DEBUG 1
#include <debug/vector>
int main() { }
g++ -std=gnu++17 x.cc
In file included from /home/jwakely/gcc/9/include/c++/9.0.0/debug/vector:34,
from x.cc:2:
/home/jwakely/gcc/9/include/c++/9.0.0/vector:87:27: error: ‘vector’ in
namespace ‘std’ does not name a template type
87 | using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
| ^~~~~~
/home/jwakely/gcc/9/include/c++/9.0.0/vector:87:22: note: ‘std::vector’ is
defined in header ‘<vector>’; did you forget to ‘#include <vector>’?
/home/jwakely/gcc/9/include/c++/9.0.0/vector:74:1:
|+#include <vector>
/home/jwakely/gcc/9/include/c++/9.0.0/vector:74:1:74 | #endif
/home/jwakely/gcc/9/include/c++/9.0.0/vector:87:22:
/home/jwakely/gcc/9/include/c++/9.0.0/vector:87:22:87 | using vector =
std::vector<_Tp, polymorphic_allocator<_Tp>>;
| ^~~
The fix-it is mangled. I don't know what the #endif is doing there, and the
caret location points to the characters "e/c" of the filename, because the
quoted source is prefixed by the filename but the caret line isn't. It seems
like the repeated filename is not being suppressed, but the caret expects it to
be.
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Subject: [Bug lto/87089] [9 regression] tree check: expected class 'type', have 'declaration' (namespace_decl) in type_with_linkage_p, at ipa-utils.h
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-08-24
Assignee|unassigned at gcc dot gnu.org |hubicka at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r263697.
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Subject: [Bug testsuite/87064] [9 regression] libgomp.oacc-fortran/reduction-3.f90 fails starting with r263751
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Janne Blomqvist <jb at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |cesar at codesourcery dot com
--- Comment #5 from Janne Blomqvist <jb at gcc dot gnu.org> ---
CC'ing some OpenACC people, Cesar, do you have a clue?
>From gcc-bugs-return-613651-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 12:39:02 2018
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Subject: [Bug c++/87091] Malformed fix-it hint for missing header
Date: Fri, 24 Aug 2018 12:39:00 -0000
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--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Looks a lot like the issue I fixed in r263606.
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Subject: [Bug c++/51180] [C++0x] inner class alias-definition variadic template error
Date: Fri, 24 Aug 2018 12:46:00 -0000
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--- Comment #7 from trashyankes at wp dot pl ---
Bug look fixed in current version (4.7.1 work correctly too).
>From gcc-bugs-return-613653-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 12:47:28 2018
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Subject: [Bug c++/87091] Malformed fix-it hint for missing header
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
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--- Comment #2 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(In reply to David Malcolm from comment #1)
> Looks a lot like the issue I fixed in r263606.
Indeed, with trunk (specifially r263787) I get:
In file included from
../x86_64-pc-linux-gnu/libstdc++-v3/include/debug/vector:34,
from /tmp/t.cc:2:
../x86_64-pc-linux-gnu/libstdc++-v3/include/vector:87:27: error: ‘vector’ in
namespace ‘std’ does not name a template type
87 | using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
| ^~~~~~
../x86_64-pc-linux-gnu/libstdc++-v3/include/vector:87:22: note: ‘std::vector’
is defined in header ‘<vector>’; did you forget to ‘#include <vector>’?
../x86_64-pc-linux-gnu/libstdc++-v3/include/vector:74:1:
++ |+#include <vector>
74 | #endif
../x86_64-pc-linux-gnu/libstdc++-v3/include/vector:87:22:
87 | using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
| ^~~
Resolving as FIXED; feel free to reopen if there's something else going on.
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Subject: [Bug lto/87089] [9 regression] tree check: expected class 'type', have 'declaration' (namespace_decl) in type_with_linkage_p, at ipa-utils.h
Date: Fri, 24 Aug 2018 12:48:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug middle-end/87092] New: [9 Regression] internal compiler error: Segmentation fault
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Bug ID: 87092
Summary: [9 Regression] internal compiler error: Segmentation
fault
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On x86-64, r263752 failed to build 254.gap from SPEC CPU 2000:
gcc -c -o finfield.o -fwrapv -DSPEC_CPU2000_LP64 -DSYS_IS_USG
-DSYS_HAS_IOCTL_PROTO -DSYS_HAS_TIME_PROTO -DSYS_HAS_SIGNAL_PROTO
-DSYS_HAS_CALLOC_PROTO -DSYS_HAS_READ_PROTO -O3 -funroll-loops
-ffast-math finfield.c
during GIMPLE pass: evrp
finfield.c: In function 'FunLogFFE':
finfield.c:1695:1: internal compiler error: Segmentation fault
1695 | }
| ^
0xcbc3bf crash_signal
../../src-trunk/gcc/toplev.c:325
0xf43793 generic_wide_int<wide_int_ref_storage<false, true> >::elt(unsigned
int) const
../../src-trunk/gcc/wide-int.h:908
0xf43793 wide_int_to_tree_1
../../src-trunk/gcc/tree.c:1488
0xf29cb2 extract_range_from_binary_expr_1(value_range*, tree_code, tree_node*,
value_range*, value_range*)
../../src-trunk/gcc/tree-vrp.c:1675
0xf2a427 extract_range_from_binary_expr_1(value_range*, tree_code, tree_node*,
value_range*, value_range*)
../../src-trunk/gcc/tree-vrp.c:1373
0xf906b6 vr_values::extract_range_from_binary_expr(value_range*, tree_code,
tree_node*, tree_node*, tree_node*)
../../src-trunk/gcc/vr-values.c:768
0xf928e0 vr_values::extract_range_from_assignment(value_range*, gassign*)
../../src-trunk/gcc/vr-values.c:1429
0x1466430 evrp_range_analyzer::record_ranges_from_stmt(gimple*, bool)
../../src-trunk/gcc/gimple-ssa-evrp-analyze.c:293
0x1464eac evrp_dom_walker::before_dom_children(basic_block_def*)
../../src-trunk/gcc/gimple-ssa-evrp.c:139
0x1444162 dom_walker::walk(basic_block_def*)
../../src-trunk/gcc/domwalk.c:353
0x14657d1 execute_early_vrp
../../src-trunk/gcc/gimple-ssa-evrp.c:310
0x14657d1 execute
../../src-trunk/gcc/gimple-ssa-evrp.c:347
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
specmake[3]: *** [finfield.o] Error 1
r263656 is OK.
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Subject: [Bug rtl-optimization/87047] [7/8/9 Regression] performance regression because of if-conversion
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--- Comment #8 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #7)
> Treating the missing else cost as 0 cost isn't right either, it is ok to
> accept some small cost, otherwise we wouldn't do the if conversion ever with
> missing else_bb.
> The thing is that it needs to be small enough.
> Do we need some new target magic constant for this, or do we just use cost
> of a few (say 4-5) moves or something similar?
Well, original_costs is already initialized with COSTS_N_INSNS (2), accounting
for test and branch that would be removed. So it's not too bad: in pr78120.c
else_bb is in fact missing.
(on x86 I think we shouldn't encourage if-conversion, by adding data
dependencies it can lengthen critical paths)
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Subject: [Bug c++/80093] missed optimization opportunity with std::uniform_int_distribution
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--- Comment #3 from trashyankes at wp dot pl ---
fixed in 8.1
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Subject: [Bug rtl-optimization/87047] [7/8/9 Regression] performance regression because of if-conversion
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--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Alexander Monakov from comment #8)
> Well, original_costs is already initialized with COSTS_N_INSNS (2),
> accounting for test and branch that would be removed. So it's not too bad:
> in pr78120.c else_bb is in fact missing.
I think that is not enough.
> (on x86 I think we shouldn't encourage if-conversion, by adding data
> dependencies it can lengthen critical paths)
if-conversion is indeed very problematic on x86-64, but it isn't as easy as
don't try to encourage it, because it slows down many important cases in that
case if jumps are used. We have many PRs where users ask on specific testcases
for more x86 if-conversion, and many PRs where users ask for less or no
if-conversion.
>From gcc-bugs-return-613659-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 13:10:30 2018
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Subject: [Bug target/87077] missed optimization for horizontal add for x86 SSE
Date: Fri, 24 Aug 2018 13:10:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
basic-block vectorization doesn't handle reduction so it gets badly confused by
it. loop vectorization just vectorizes the inner loop (if you disable
unrolling of it).
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87080] [9 Regression] ice in cp_get_fndecl_from_callee, at cp/cvt.c:965
Date: Fri, 24 Aug 2018 13:11:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
Summary|ice in |[9 Regression] ice in
|cp_get_fndecl_from_callee, |cp_get_fndecl_from_callee,
|at cp/cvt.c:965 |at cp/cvt.c:965
>From gcc-bugs-return-613661-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 13:16:07 2018
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Subject: [Bug middle-end/87092] [9 Regression] internal compiler error: Segmentation fault
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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CC| |mpolacek at gcc dot gnu.org
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Dup.
*** This bug has been marked as a duplicate of bug 87059 ***
>From gcc-bugs-return-613662-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 13:16:13 2018
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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CC| |hjl.tools at gmail dot com
--- Comment #11 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
*** Bug 87092 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-613663-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 13:19:03 2018
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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/87047] [7/8/9 Regression] performance regression because of if-conversion
Date: Fri, 24 Aug 2018 13:19:00 -0000
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--- Comment #10 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Scaling costs by edge probabilities would also solve this issue, perhaps in a
cleaner way.
(to be clear: if speed_p, instead of taking the weird faux-minimum, add to
original_cost the linear combination of then_bb/else_bb costs according to
their relative probabilities; in this case we would take roughly 0.5*then_cost)
>From gcc-bugs-return-613664-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 13:36:37 2018
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From: "matz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/86973] [6/7/8/9 Regression] ICE in expand_call, at calls.c:4217
Date: Fri, 24 Aug 2018 13:36:00 -0000
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--- Comment #4 from Michael Matz <matz at gcc dot gnu.org> ---
FWIW, the testcase is broken since it can be compiled, namely since
the two attributes ms_abi and sysv_abi are accepted, which is r137525 from
2008. Only broken with -mno-accumulate-outgoing-args of course.
So, I guess we can safely say that this is no regression in all sensible
definitions of the word.
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From: "TonyELewis at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87093] New: is_constructible (__is_constructible() instrinsic) explicitly instantiates conversion member function of source
Date: Fri, 24 Aug 2018 13:53:00 -0000
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Bug ID: 87093
Summary: is_constructible (__is_constructible() instrinsic)
explicitly instantiates conversion member function of
source
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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Reporter: TonyELewis at hotmail dot com
Target Milestone: ---
This following fails to compile under `g++ -fsyntax-only -std=c++17` but
succeeds under `clang++ -fsyntax-only -std=c++17` :
~~~
#include <type_traits>
template <typename T> struct x {
operator bool() {
static_assert( ! ::std::is_same_v<T, T> );
return false;
}
};
inline constexpr auto a = ::std::is_constructible<bool, x<int>>{};
~~~
The error is:
~~~
a.cpp: In instantiation of ‘x<T>::operator bool() [with T = int]’:
/usr/include/c++/8/type_traits:932:12: required from ‘struct
std::is_constructible<bool, x<int> >’
a.cpp:10:65: required from here
a.cpp:5:18: error: static assertion failed
static_assert( ! ::std::is_same_v<T, T> );
^~~~
~~~
I think this means that GCC's `__is_constructible()` intrinsic is explicitly
instantiating x's `operator bool()` when trying to figure out whether a bool
can be constructed from an x, whereas Clang' `__is_constructible()` isn't.
>From a quick look, I can't see anything obvious in the standard about whether
either GCC or Clang is wrong here and I guess it's arguable either way. But I
think I'd lean towards arguing that Clang's behaviour better reflects what I'd
expect from traits.
I've replicated this on Godbolt's GCC 9.0.0 20180823.
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Subject: [Bug libstdc++/68222] _Safe_iterator provides operators the wrapped iterator can't actually support
Date: Fri, 24 Aug 2018 13:56:00 -0000
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--- Comment #4 from Tony E Lewis <TonyELewis at hotmail dot com> ---
Yes - Godbolt's GCC trunk is now showing an error where I'd expect within the
original repro code.
Great stuff. Thanks very much for your work on this.
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Subject: [Bug testsuite/87064] [9 regression] libgomp.oacc-fortran/reduction-3.f90 fails starting with r263751
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cesar at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
CC| |cesar at gcc dot gnu.org,
| |tschwinge at gcc dot gnu.org
--- Comment #6 from cesar at gcc dot gnu.org ---
I wasn't able to replicate this failure on an x86_64 target either with or
without nvptx offloading. It's like this is the vector reduction that's
failing:
!$acc parallel vector_length(vl) copy(rv)
!$acc loop reduction(max:rv) vector
do i = 1, n
rv = max (rv, array(i))
end do
!$acc end parallel
Maybe a reduction variable isn't being initialized properly. But that's strange
because on the host, all of the reductions are handled the same. That's not
true with nvptx.
I'll escalate this issue internally in Mentor.
>From gcc-bugs-return-613668-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 14:18:22 2018
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Subject: [Bug rtl-optimization/87047] [7/8/9 Regression] performance regression because of if-conversion
Date: Fri, 24 Aug 2018 14:18:00 -0000
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--- Comment #11 from Michael_S <already5chosen at yahoo dot com> ---
Sorry for intervening, but IMHO a new __builtin is long overdue.
__builtin
(In reply to Jakub Jelinek from comment #9)
> (In reply to Alexander Monakov from comment #8)
> > Well, original_costs is already initialized with COSTS_N_INSNS (2),
> > accounting for test and branch that would be removed. So it's not too bad:
> > in pr78120.c else_bb is in fact missing.
>
> I think that is not enough.
>
> > (on x86 I think we shouldn't encourage if-conversion, by adding data
> > dependencies it can lengthen critical paths)
>
> if-conversion is indeed very problematic on x86-64, but it isn't as easy as
> don't try to encourage it, because it slows down many important cases in
> that case if jumps are used. We have many PRs where users ask on specific
> testcases for more x86 if-conversion, and many PRs where users ask for less
> or no if-conversion.
if-conversion, except for simplest shortest cases, is problematic on any
processor with good branch prediction and not very wide pipeline. Nothing
specific to x86-64 here. To something like ARM Cortex-A73 (dual-issue) it
applies much stronger than to Skylake or Ryzen.
If it was dependent on me then, starting from gcc9, I would apply automatic
(i.e. non-PGO) if-conversion only to *really* short sequences. For anything
longer, I'd request user hint in form of __builtin_expect_with_probability(,
0.5).
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Subject: [Bug c++/87075] [7/8/9 Regression] ICE when compiling the test suite of GLM 0.9.9.0
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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| |jason at gcc dot gnu.org
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Indeed. The VOID_CST elts of the CONSTRUCTOR come from the
8352 if (is_dummy_object (argarray[0]))
8353 return force_target_expr (DECL_CONTEXT (fn), void_node,
8354 no_cleanup_complain);
that patch added, and the constexpr handling code is upset that there is a
VOID_CST rather than CONSTRUCTOR inside of the elts.
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Subject: [Bug testsuite/78529] gcc.c-torture/execute/builtins/strcat-chk.c failed with lto/O2
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Joey Ye <joey.ye at arm dot com> changed:
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--- Comment #36 from Joey Ye <joey.ye at arm dot com> ---
Simply applying __attribute__((noipa)) to memset (and all other C lib
implementations) in chk.c prevents IPA analysis in the local implementation of
memset, thus avoids the issue when it is later replaced by a library copy.
The workaround does pass this case in my experiment, which can be turn into a
patch after additional work and testing. Is it an acceptable workaround to
upstream?
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Subject: [Bug tree-optimization/87074] [8/9 Regression] Vectorization bug: O3 result differ from O2
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r255467.
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Subject: [Bug c/82967] "did you mean" suggestions are way too suggestive
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--- Comment #6 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Candidate patch: https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01542.html
>From gcc-bugs-return-613673-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 14:51:54 2018
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Subject: [Bug tree-optimization/87074] [8/9 Regression] Vectorization bug: O3 result differ from O2
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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CC| |matz at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
There is a clear dependency between different iterations of the outer loop, the
b in second and following iterations depends on the c[e] computed by the
earlier iteration, so I think unrolljam pass should punt somewhere. CCing
author.
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Subject: [Bug tree-optimization/87086] [9 Regression] ICE in canonize from wide-int.cc when building SPEC2000 254.gap
Date: Fri, 24 Aug 2018 14:58:00 -0000
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--- Comment #3 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
My bad. This is a duplicate but of pr87073, which is now fixed on mainline.
*** This bug has been marked as a duplicate of bug 87073 ***
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Subject: [Bug bootstrap/87073] go bootstrap failure due to ICE in vr_values::extract_range_from_binary_expr
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Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #8 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
*** Bug 87086 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-613676-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 15:26:01 2018
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Subject: [Bug c++/86953] [6/7/8/9 Regression] compiler crashes with constexpr operator== and specific struct (cxx_eval_bit_field_ref, at cp/constexpr.c:2704)
Date: Fri, 24 Aug 2018 15:26:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
Depends on| |81601
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Another reason why we badly need to finish PR81601.
The constexpr evaluator really can't cope well with these BIT_FIELD_REFs, they
read multiple fields at once, or could also read some uninitialized bits in
between and mask them off, etc.
So at minimum we'd need to disable these optimizations while folding constexpr
declared functions and if the fields don't have INTEGRAL_TYPE or the bit field
reference covers more than one field.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81601
[Bug 81601] [7/8/9 Regression] incorrect Warray-bounds warning with -fsanitize
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
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--- Comment #12 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
BTW, this is reproducible with an x86-64 cross by forcing the generation of
cmpstrnsi with -mcpu=cell and the following patch:
diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index 9ea5959ea14..ac1034b6f24 100644
--- a/gcc/config/rs6000/rs6000.h
+++ b/gcc/config/rs6000/rs6000.h
@@ -264,7 +264,7 @@ extern const char *host_detect_local_cpu (int argc, const
char **argv);
#ifndef HAVE_AS_CMPB
#undef TARGET_CMPB
-#define TARGET_CMPB 0
+#define TARGET_CMPB 1
#endif
/* Define TARGET_MFPGPR if the target assembler does not support the
(It really irks me that the PPC backend has backend behavior that depends on
what assembler (or cross assembler) is available at configure time. It makes
it difficult to reproduce bugs with crosses.)
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|powerpc64le-linux |
--- Comment #13 from H.J. Lu <hjl.tools at gmail dot com> ---
This bug also happens on x86-64.
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
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--- Comment #14 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #13)
> This bug also happens on x86-64.
Would you happen to have a preprocessed testcase on x86-64?
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
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--- Comment #15 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #12)
> (It really irks me that the PPC backend has backend behavior that depends on
> what assembler (or cross assembler) is available at configure time. It
> makes it difficult to reproduce bugs with crosses.)
This is so that it is possible to build GCC with a (slightly) older binutils.
You should never have problems with this if you always use a binutils for your
cross toolchains that is approximately as old as your GCC. Did you use an
ancient cross assembler?
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Subject: [Bug c++/86942] A trailing-return-type is allowed when the return type is not 'auto' for using declarations
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Fri Aug 24 15:48:43 2018
New Revision: 263836
URL: https://gcc.gnu.org/viewcvs?rev=263836&root=gcc&view=rev
Log:
PR c++/67012
PR c++/86942
* decl.c (grokdeclarator): Disallow functions with trailing return
type with decltype(auto) as its type. Also check the function if
it's inner declarator doesn't exist
* g++.dg/cpp0x/auto52.C: New test.
* g++.dg/cpp1y/auto-fn52.C: New test.
* g++.dg/cpp1y/auto-fn53.C: New test.
* g++.dg/cpp1y/auto-fn54.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/auto52.C
trunk/gcc/testsuite/g++.dg/cpp1y/auto-fn52.C
trunk/gcc/testsuite/g++.dg/cpp1y/auto-fn53.C
trunk/gcc/testsuite/g++.dg/cpp1y/auto-fn54.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/decl.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/67012] decltype(auto) with trailing return type
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Fri Aug 24 15:48:43 2018
New Revision: 263836
URL: https://gcc.gnu.org/viewcvs?rev=263836&root=gcc&view=rev
Log:
PR c++/67012
PR c++/86942
* decl.c (grokdeclarator): Disallow functions with trailing return
type with decltype(auto) as its type. Also check the function if
it's inner declarator doesn't exist
* g++.dg/cpp0x/auto52.C: New test.
* g++.dg/cpp1y/auto-fn52.C: New test.
* g++.dg/cpp1y/auto-fn53.C: New test.
* g++.dg/cpp1y/auto-fn54.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/auto52.C
trunk/gcc/testsuite/g++.dg/cpp1y/auto-fn52.C
trunk/gcc/testsuite/g++.dg/cpp1y/auto-fn53.C
trunk/gcc/testsuite/g++.dg/cpp1y/auto-fn54.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/decl.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/86942] A trailing-return-type is allowed when the return type is not 'auto' for using declarations
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug c++/67012] decltype(auto) with trailing return type
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-613685-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 15:51:09 2018
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Subject: [Bug c++/86942] A trailing-return-type is allowed when the return type is not 'auto' for using declarations
Date: Fri, 24 Aug 2018 15:51:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
.
>From gcc-bugs-return-613686-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 15:59:18 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87028] false positive -Wstringop-truncation strncpy with global variable source string
Date: Fri, 24 Aug 2018 15:59:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch posted for review:
https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01549.html
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
Date: Fri, 24 Aug 2018 16:02:00 -0000
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--- Comment #16 from Aldy Hernandez <aldyh at redhat dot com> ---
On 08/24/2018 11:41 AM, segher at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87059
>
> --- Comment #15 from Segher Boessenkool <segher at gcc dot gnu.org> ---
> (In reply to Aldy Hernandez from comment #12)
>> (It really irks me that the PPC backend has backend behavior that depends on
>> what assembler (or cross assembler) is available at configure time. It
>> makes it difficult to reproduce bugs with crosses.)
>
> This is so that it is possible to build GCC with a (slightly) older binutils.
> You should never have problems with this if you always use a binutils for your
> cross toolchains that is approximately as old as your GCC. Did you use an
> ancient cross assembler?
>
I rarely use a cross assembler, since I only build cc1.
>From gcc-bugs-return-613688-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 16:13:57 2018
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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/87094] New: Suboptimal accounting for stack growth in inlining
Date: Fri, 24 Aug 2018 16:13:00 -0000
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Bug ID: 87094
Summary: Suboptimal accounting for stack growth in inlining
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On this small example:
void g(int, char *);
static void f(int x)
{
char c[2048];
g(x, c);
}
void h(int x)
{
f(x);
}
GCC does not inline f into h due to reaching stack growth limit. However, since
f is called unconditionally, the original stack growth is at least max(f_stack,
h_stack), and post-inlining stack growth is at most f_stack+h_stack.
Since h_stack is 0, both are equal and inlining should be considered.
If h called f only conditionally, avoiding inlining would be correct.
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87093] is_constructible (__is_constructible() instrinsic) explicitly instantiates conversion member function of source
Date: Fri, 24 Aug 2018 16:16:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-24
CC| |ville at gcc dot gnu.org
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Tony E Lewis from comment #0)
> From a quick look, I can't see anything obvious in the standard about
> whether either GCC or Clang is wrong here and I guess it's arguable either
> way. But I think I'd lean towards arguing that Clang's behaviour better
> reflects what I'd expect from traits.
A handrolled trait in pure C++ without the intrinsic doesn't need to
instantiate it, so I agree the intrinsic shouldn't.
struct true_type { static constexpr bool value = true; };
struct false_type { static constexpr bool value = false; };
template<typename> struct always_false : false_type { };
template <typename T> struct x {
operator bool() {
static_assert( always_false<T>::value );
return false;
}
};
template<typename T, typename Arg>
struct is_constructible_impl
{
template<typename U>
static auto
test(Arg* a) -> decltype(U(*a), void(), true_type{});
template<typename U>
static false_type
test(...);
using type = decltype(test<T>((Arg*)0));
};
template<typename T, typename Arg>
struct is_constructible : is_constructible_impl<T, Arg>::type { };
inline constexpr auto a = is_constructible<bool, x<int>>{};
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
Date: Fri, 24 Aug 2018 16:22:00 -0000
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--- Comment #17 from H.J. Lu <hjl.tools at gmail dot com> ---
On x86-64:
[hjl@gnu-cfl-1 gcc]$ cat x.c
int a, b;
void
c(void) {
if (b)
b = a / b;
}
[hjl@gnu-cfl-1 gcc]$ ./xgcc -B./ -O3 -funroll-loops -ffast-math -fwrapv -S x.c
during GIMPLE pass: evrp
x.c: In function ‘c’:
x.c:7:1: internal compiler error: Segmentation fault
7 | }
| ^
0x102b902 crash_signal
/export/gnu/import/git/sources/gcc/gcc/toplev.c:325
0xb3e3b2 generic_wide_int<wide_int_ref_storage<false, true> >::elt(unsigned
int) const
/export/gnu/import/git/sources/gcc/gcc/wide-int.h:908
0x13b04cf wide_int_to_tree_1
/export/gnu/import/git/sources/gcc/gcc/tree.c:1488
0x13b0edb wide_int_to_tree(tree_node*, poly_int<1u,
generic_wide_int<wide_int_ref_storage<false, true> > > const&)
/export/gnu/import/git/sources/gcc/gcc/tree.c:1676
0x1396b58 extract_range_from_binary_expr_1(value_range*, tree_code, tree_node*,
value_range*, value_range*)
/export/gnu/import/git/sources/gcc/gcc/tree-vrp.c:1675
0x1395921 extract_range_from_binary_expr_1(value_range*, tree_code, tree_node*,
value_range*, value_range*)
/export/gnu/import/git/sources/gcc/gcc/tree-vrp.c:1373
0x1445e2b vr_values::extract_range_from_binary_expr(value_range*, tree_code,
tree_node*, tree_node*, tree_node*)
/export/gnu/import/git/sources/gcc/gcc/vr-values.c:768
0x1448d02 vr_values::extract_range_from_assignment(value_range*, gassign*)
/export/gnu/import/git/sources/gcc/gcc/vr-values.c:1429
0x144a8f8 vr_values::vrp_visit_assignment_or_call(gimple*, tree_node**,
value_range*)
/export/gnu/import/git/sources/gcc/gcc/vr-values.c:2048
0x144c7d7 vr_values::extract_range_from_stmt(gimple*, edge_def**, tree_node**,
value_range*)
/export/gnu/import/git/sources/gcc/gcc/vr-values.c:2744
0x1c20820 evrp_range_analyzer::record_ranges_from_stmt(gimple*, bool)
/export/gnu/import/git/sources/gcc/gcc/gimple-ssa-evrp-analyze.c:293
0x1c1dfee evrp_dom_walker::before_dom_children(basic_block_def*)
/export/gnu/import/git/sources/gcc/gcc/gimple-ssa-evrp.c:139
0x1bece59 dom_walker::walk(basic_block_def*)
/export/gnu/import/git/sources/gcc/gcc/domwalk.c:353
0x1c1e791 execute_early_vrp
/export/gnu/import/git/sources/gcc/gcc/gimple-ssa-evrp.c:310
0x1c1e85c execute
/export/gnu/import/git/sources/gcc/gcc/gimple-ssa-evrp.c:347
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
[hjl@gnu-cfl-1 gcc]$
>From gcc-bugs-return-613691-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 16:25:15 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
Date: Fri, 24 Aug 2018 16:25:00 -0000
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--- Comment #18 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
BTW, the suggest patch in comment 10 causes an x86-64 regression on
gcc.dg/attr-nonstring-3.c because of some incompatibility with ssizetype and
sizetype. I believe it's related to this:
https://gcc.gnu.org/ml/gcc/2018-08/msg00164.html
...so it may be a rat's nest to fix. I may just make VRP work with broken
behavior it expected before.
>From gcc-bugs-return-613692-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 16:31:22 2018
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
Date: Fri, 24 Aug 2018 16:31:00 -0000
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--- Comment #19 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #17)
> On x86-64:
>
> [hjl@gnu-cfl-1 gcc]$ cat x.c
> int a, b;
>
> void
> c(void) {
> if (b)
> b = a / b;
> }
> [hjl@gnu-cfl-1 gcc]$ ./xgcc -B./ -O3 -funroll-loops -ffast-math -fwrapv -S
> x.c
> during GIMPLE pass: evrp
> x.c: In function ‘c’:
> x.c:7:1: internal compiler error: Segmentation fault
> 7 | }
> | ^
> 0x102b902 crash_signal
> /export/gnu/import/git/sources/gcc/gcc/toplev.c:325
> 0xb3e3b2 generic_wide_int<wide_int_ref_storage<false, true> >::elt(unsigned
> int) const
> /export/gnu/import/git/sources/gcc/gcc/wide-int.h:908
> 0x13b04cf wide_int_to_tree_1
> /export/gnu/import/git/sources/gcc/gcc/tree.c:1488
> 0x13b0edb wide_int_to_tree(tree_node*, poly_int<1u,
> generic_wide_int<wide_int_ref_storage<false, true> > > const&)
> /export/gnu/import/git/sources/gcc/gcc/tree.c:1676
> 0x1396b58 extract_range_from_binary_expr_1(value_range*, tree_code,
> tree_node*, value_range*, value_range*)
> /export/gnu/import/git/sources/gcc/gcc/tree-vrp.c:1675
> 0x1395921 extract_range_from_binary_expr_1(value_range*, tree_code,
> tree_node*, value_range*, value_range*)
> /export/gnu/import/git/sources/gcc/gcc/tree-vrp.c:1373
> 0x1445e2b vr_values::extract_range_from_binary_expr(value_range*, tree_code,
> tree_node*, tree_node*, tree_node*)
> /export/gnu/import/git/sources/gcc/gcc/vr-values.c:768
> 0x1448d02 vr_values::extract_range_from_assignment(value_range*, gassign*)
> /export/gnu/import/git/sources/gcc/gcc/vr-values.c:1429
> 0x144a8f8 vr_values::vrp_visit_assignment_or_call(gimple*, tree_node**,
> value_range*)
> /export/gnu/import/git/sources/gcc/gcc/vr-values.c:2048
> 0x144c7d7 vr_values::extract_range_from_stmt(gimple*, edge_def**,
> tree_node**, value_range*)
> /export/gnu/import/git/sources/gcc/gcc/vr-values.c:2744
> 0x1c20820 evrp_range_analyzer::record_ranges_from_stmt(gimple*, bool)
> /export/gnu/import/git/sources/gcc/gcc/gimple-ssa-evrp-analyze.c:293
> 0x1c1dfee evrp_dom_walker::before_dom_children(basic_block_def*)
> /export/gnu/import/git/sources/gcc/gcc/gimple-ssa-evrp.c:139
> 0x1bece59 dom_walker::walk(basic_block_def*)
> /export/gnu/import/git/sources/gcc/gcc/domwalk.c:353
> 0x1c1e791 execute_early_vrp
> /export/gnu/import/git/sources/gcc/gcc/gimple-ssa-evrp.c:310
> 0x1c1e85c execute
> /export/gnu/import/git/sources/gcc/gcc/gimple-ssa-evrp.c:347
> Please submit a full bug report,
> with preprocessed source if appropriate.
> Please include the complete backtrace with any bug report.
> See <https://gcc.gnu.org/bugs/> for instructions.
> [hjl@gnu-cfl-1 gcc]$
hj. I think what you are reporting on x86 is pr87073 instead, and has been
fixed in mainline.
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Subject: [Bug bootstrap/87073] go bootstrap failure due to ICE in vr_values::extract_range_from_binary_expr
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hjl.tools at gmail dot com
--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
*** Bug 87092 has been marked as a duplicate of this bug. ***
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Subject: [Bug middle-end/87092] [9 Regression] internal compiler error: Segmentation fault
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--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
*** This bug has been marked as a duplicate of bug 87073 ***
>From gcc-bugs-return-613695-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 16:38:03 2018
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
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--- Comment #20 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #18)
> BTW, the suggest patch in comment 10 causes an x86-64 regression on
> gcc.dg/attr-nonstring-3.c because of some incompatibility with ssizetype and
> sizetype. I believe it's related to this:
>
> https://gcc.gnu.org/ml/gcc/2018-08/msg00164.html
>
> ...so it may be a rat's nest to fix. I may just make VRP work with broken
> behavior it expected before.
Testing the following.
gcc/
PR 87059/tree-optimization
* tree-vrp.c (extract_range_from_binary_expr_1): Pass sign of
first argument to wide_int_range_min_max.
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c
index 735b3646e81..7373011d901 100644
--- a/gcc/tree-vrp.c
+++ b/gcc/tree-vrp.c
@@ -1566,6 +1566,15 @@ extract_range_from_binary_expr_1 (value_range *vr,
wide_int vr1_min, vr1_max;
extract_range_into_wide_ints (&vr0, sign, prec, vr0_min, vr0_max);
extract_range_into_wide_ints (&vr1, sign, prec, vr1_min, vr1_max);
+
+ /* FIXME: Currently the sign of MIN_EXPR and the sign of its
+ arguments are not always the same. Fixing the creators of
+ these faulty nodes caused other problems. For now use the
+ sign of the first argument as VRP was previously doing. See
+ PR87059. */
+ if (vr0.min)
+ sign = TYPE_SIGN (TREE_TYPE (vr0.min));
+
if (wide_int_range_min_max (wmin, wmax, code, sign, prec,
vr0_min, vr0_max, vr1_min, vr1_max))
set_value_range (vr, VR_RANGE,
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at redhat dot com,
| |nathan at acm dot org
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing c++ FE maintainers
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Subject: [Bug middle-end/87092] [9 Regression] internal compiler error: Segmentation fault
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--- Comment #3 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Fri Aug 24 16:58:27 2018
New Revision: 263837
URL: https://gcc.gnu.org/viewcvs?rev=263837&root=gcc&view=rev
Log:
Add a testcase for PR middle-end/87092
PR middle-end/87092
* gcc.dg/pr87092.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr87092.c
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/86837] [8/9 Regression] Optimization breaks an unformatted read with implicit loop
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--- Comment #6 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Fri Aug 24 17:26:57 2018
New Revision: 263838
URL: https://gcc.gnu.org/viewcvs?rev=263838&root=gcc&view=rev
Log:
2018-08-24 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/86837
* frontend-passes.c (var_in_expr_callback): New function.
(var_in_expr): New function.
(traverse_io_block): Use var_in_expr instead of
gfc_check_dependency for checking if the variable depends on the
previous interators.
2018-08-24 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/86837
* gfortran.dg/implied_do_io_6.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/implied_do_io_6.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/frontend-passes.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug sanitizer/87095] New: UndefinedBehaviorSanitizer vptr false positive with virtual inheritance only with -fno-sanitize-recover
Date: Fri, 24 Aug 2018 17:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87095
Bug ID: 87095
Summary: UndefinedBehaviorSanitizer vptr false positive with
virtual inheritance only with -fno-sanitize-recover
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: vakevk at gmail dot com
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at gcc dot gnu.org
Target Milestone: ---
Created attachment 44591
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44591&action=edit
main.cpp
Program does not run successfully when compiled with:
g++ -fsanitize=vptr -fno-sanitize-recover=vptr main.cpp
main.cpp:9:8: runtime error: member call on address 0x7ffd7987dc20 which does
not point to an object of type 'A'
0x7ffd7987dc20: note: object has invalid vptr
c1 55 00 00 00 00 00 00 00 00 00 00 00 b0 34 7e ca 6d 56 eb 20 dd 87 79 fd
7f 00 00 00 00 00 00
^~~~~~~~~~~~~~~~~~~~~~~
invalid vptr
Program runs successfully if -fno-sanitize-recover=vptr is not specified or
when compiled with clang++ (6.0.1-5) with the original options.
Even without knowing whether the error message is correct, there is bug here
because the message should be shown consistently regardless of the recovery
option.
g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --enable-multilib --disable-werror
--enable-checking=release --enable-default-pie --enable-default-ssp
--enable-cet=auto
Thread model: posix
gcc version 8.2.0 (GCC)
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Subject: [Bug fortran/86545] [6/7/8/9 Regression] ICE in transfer_expr on invalid WRITE statement
Date: Fri, 24 Aug 2018 17:35:00 -0000
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janus at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
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--- Comment #5 from janus at gcc dot gnu.org ---
I'm now testing the following patch, which fixes the problem:
diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
index 4ad4dcf780d..ac054483e0e 100644
--- a/gcc/fortran/resolve.c
+++ b/gcc/fortran/resolve.c
@@ -9272,7 +9272,6 @@ resolve_select_type (gfc_code *code, gfc_namespace
*old_ns)
static void
resolve_transfer (gfc_code *code)
{
- gfc_typespec *ts;
gfc_symbol *sym, *derived;
gfc_ref *ref;
gfc_expr *exp;
@@ -9308,7 +9307,9 @@ resolve_transfer (gfc_code *code)
_("item in READ")))
return;
- ts = exp->expr_type == EXPR_STRUCTURE ? &exp->ts : &exp->symtree->n.sym->ts;
+ const gfc_typespec *ts = exp->expr_type == EXPR_STRUCTURE
+ || exp->expr_type == EXPR_FUNCTION
+ ? &exp->ts : &exp->symtree->n.sym->ts;
/* Go to actual component transferred. */
for (ref = exp->ref; ref; ref = ref->next)
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Subject: [Bug libstdc++/20150] allocate(0) consistency checks
Date: Fri, 24 Aug 2018 17:36:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I thought this was by design, because it ensures we never return a null
pointer, and that any two calls to allocate will return different values.
I'm inclined to close this as WONTFIX.
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Subject: [Bug libstdc++/16612] empty basic_strings can't live in shared memory
Date: Fri, 24 Aug 2018 17:39:00 -0000
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--- Comment #36 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Is there anything left to "fix" here?
Fully dynamic string should help the COW string cases.
The new __cxx11::basic_string fully supports C++11 allocators and so should
work with allocators using "fancy pointers".
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Subject: [Bug libstdc++/86822] attribute((malloc)) for new(nothrow)
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--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
Author: glisse
Date: Fri Aug 24 18:24:42 2018
New Revision: 263841
URL: https://gcc.gnu.org/viewcvs?rev=263841&root=gcc&view=rev
Log:
new(nothrow) is malloc-like
2018-08-24 Marc Glisse <marc.glisse@inria.fr>
PR libstdc++/86822
* libsupc++/new (operator new(size_t, nothrow_t), operator
new[](size_t, nothrow_t), operator new(size_t, align_val_t, nothrow_t),
operator new[](size_t, align_val_t, nothrow_t)): Add malloc attribute.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/libsupc++/new
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Subject: [Bug fortran/86545] [6/7/8/9 Regression] ICE in transfer_expr on invalid WRITE statement
Date: Fri, 24 Aug 2018 18:31:00 -0000
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--- Comment #6 from janus at gcc dot gnu.org ---
(In reply to janus from comment #5)
> I'm now testing the following patch, which fixes the problem:
Regtests cleanly.
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From: "awilfox at adelielinux dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/87096] New: "Optimised" snprintf is not POSIX conformant
Date: Fri, 24 Aug 2018 18:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87096
Bug ID: 87096
Summary: "Optimised" snprintf is not POSIX conformant
Product: gcc
Version: 6.4.0
URL: http://pubs.opengroup.org/onlinepubs/9699919799/functi
ons/snprintf.html
Status: UNCONFIRMED
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Priority: P3
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Assignee: unassigned at gcc dot gnu.org
Reporter: awilfox at adelielinux dot org
Target Milestone: ---
POSIX Issue 7, 2018 edition (see URL)
The snprintf() function shall fail if:
[EOVERFLOW]
The value of n is greater than {INT_MAX}.
This behaviour may or may not be ISO C compatible: C99 WG14 and C11
specifically state that intending the printf family of functions to return
larger than INT_MAX is undefined behaviour: J.2. I am unclear on the status of
this behaviour with regards to C89. It is definitely required by POSIX.
The following line of C, which is the minimum reproduction case:
snprintf(buf, (size_t)INT_MAX + 1, "");
returns 0 when compiled with GCC unless -fno-builtin is passed.
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Subject: [Bug libstdc++/86822] attribute((malloc)) for new(nothrow)
Date: Fri, 24 Aug 2018 18:39:00 -0000
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Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
.
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From: "achurch+gcc at achurch dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/87041] [8/9 Regression] GCC 8 regression: -Wformat "reading through null pointer" on unreachable code
Date: Fri, 24 Aug 2018 18:50:00 -0000
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--- Comment #3 from Andrew Church <achurch+gcc at achurch dot org> ---
I agree it's a good idea to warn if the code is reachable, but if not, it's
only so much noise.
I can see that in this case the second const makes no difference to code
generation, but I'd prefer not to modify the macro since doing so would go
against the style of related code, which does in fact use *const where
appropriate to ensure pointer variables are not inadvertently changed. I'd
also be a bit concerned that future changes to dataflow analysis or
optimization passes could trigger the warning even without the const, at which
point it would be less trivial to work around.
>From gcc-bugs-return-613708-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 18:52:40 2018
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From: "jb at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug web/87050] Bump wwwdocs to html5
Date: Fri, 24 Aug 2018 18:52:00 -0000
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--- Comment #5 from Janne Blomqvist <jb at gcc dot gnu.org> ---
I looked through some mails in the archives, and I learned that the current
wwwdocs uses metahtml, which hasn't been maintained for years and years, and
doesn't even compile anymore. Ugh!
For an even more drastic solution than the proposed xhtml -> html5 conversion,
what about converting to use, say, sphinx (www.sphinx-doc.org)? There are
certainly other tools for generating static websites, but sphinx is maintained
and fairly widely used for software documentation style sites. E.g. everything
on readthedocs.org, and the Linux kernel (https://lwn.net/Articles/692704/ and
https://www.kernel.org/doc/html/latest/ ).
I'm slightly biased, as we use sphinx (with readthedocs, but with our own DNS
name) for a project at work, and we're quite happy with it.
The feasibility of this of course depends on being able to convert the existing
html docs to rst (or markdown) in some (semi-)automated fashion. Maybe pandoc
is up to it..? If you think this is not a completely mad idea, I can have a go
at it and see if I get some preliminary conversion done with a modest amount of
effort.
(and yes, sphinx does generate html5, so using sphinx would fix this PR as
well. :) )
>From gcc-bugs-return-613709-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 19:08:12 2018
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Subject: [Bug tree-optimization/87059] [9 Regression] internal compiler error: in set_value_range, at tree-vrp.c:289
Date: Fri, 24 Aug 2018 19:08:00 -0000
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--- Comment #21 from Martin Sebor <msebor at gcc dot gnu.org> ---
As discussed on IRC this morning, I hope the following patch will avoid having
to apply the VRP workaround:
https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01563.html
>From gcc-bugs-return-613710-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 19:12:20 2018
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Subject: [Bug middle-end/87041] [8/9 Regression] GCC 8 regression: -Wformat "reading through null pointer" on unreachable code
Date: Fri, 24 Aug 2018 19:12:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Moving the null warning to the sprintf pass (and extending the latter to also
handle {f,}printf as well) would solve the problem and help detect many other
kinds of bugs a front-end warning can't.
>From gcc-bugs-return-613711-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 19:21:17 2018
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Subject: [Bug fortran/86545] [6/7/8/9 Regression] ICE in transfer_expr on invalid WRITE statement
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Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:
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--- Comment #7 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
(In reply to janus from comment #6)
> (In reply to janus from comment #5)
> > I'm now testing the following patch, which fixes the problem:
>
> Regtests cleanly.
Approved with usual ChangLog and test cases.
>From gcc-bugs-return-613712-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 19:24:04 2018
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Subject: [Bug rtl-optimization/87096] "Optimised" snprintf is not POSIX conformant
Date: Fri, 24 Aug 2018 19:24:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-24
CC| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
Known to fail| |4.7.4, 5.3.0, 6.4.0, 7.3.0,
| |8.1.0, 9.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed. This goes back to the original folding of snprintf to memcpy.
$ cat f.c && gcc -O2 -S -Wall -fdump-tree-optimized=/dev/stdout f.c
int f (char *d)
{
return __builtin_snprintf (d, __INT_MAX__ + 1LLU, "");
}
f.c: In function ‘f’:
f.c:3:53: warning: zero-length gnu_printf format string [-Wformat-zero-length]
return __builtin_snprintf (d, __INT_MAX__ + 1LLU, "");
^~
;; Function f (f, funcdef_no=0, decl_uid=1756, cgraph_uid=0, symbol_order=0)
f (char * d)
{
<bb 2>:
__builtin_memcpy (d_2(D), "", 1);
return 0;
}
GCC 8 warns on this case but still folds it into memcpy and return 0.
f.c:3:10: warning: specified bound 2147483648 exceeds ‘INT_MAX’
[-Wformat-truncation=]
return __builtin_snprintf (d, __INT_MAX__ + 1LLU, "");
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>From gcc-bugs-return-613713-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 19:25:16 2018
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Subject: [Bug rtl-optimization/87096] "Optimised" snprintf is not POSIX conformant
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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>From gcc-bugs-return-613714-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 19:26:06 2018
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Subject: [Bug middle-end/87041] [8/9 Regression] GCC 8 regression: -Wformat "reading through null pointer" on unreachable code
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I don't think we want to move it there, that will mean lots of false positives
due to jump threading etc.
It is a good thing this is a FE warning.
>From gcc-bugs-return-613715-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 19:27:39 2018
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Subject: [Bug web/87050] Bump wwwdocs to html5
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--- Comment #6 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
A replacement for MetaHTML is already available, we just need to switch to
using it.
https://gcc.gnu.org/ml/gcc-patches/2018-06/msg00176.html
>From gcc-bugs-return-613716-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 19:31:49 2018
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Subject: [Bug web/87050] Bump wwwdocs to html5
Date: Fri, 24 Aug 2018 19:31:00 -0000
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--- Comment #7 from Janne Blomqvist <jb at gcc dot gnu.org> ---
(In reply to joseph@codesourcery.com from comment #6)
> A replacement for MetaHTML is already available, we just need to switch to
> using it.
>
> https://gcc.gnu.org/ml/gcc-patches/2018-06/msg00176.html
Yes, I did see that. I was perhaps a bit unclear, it just got me thinking if it
would be worth broadening the scope from "just" a xhtml->html5 conversion, and
if so, what that could be.
>From gcc-bugs-return-613717-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 19:32:06 2018
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Subject: [Bug middle-end/87041] [8/9 Regression] GCC 8 regression: -Wformat "reading through null pointer" on unreachable code
Date: Fri, 24 Aug 2018 19:32:00 -0000
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--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
-Wformat-overflow already warns for null pointers. I don't recall any bug
reports about it so it shouldn't be too bad.
void f (char *d, char *p)
{
if (p) return;
__builtin_sprintf (d, "%s", p);
}
warning: ‘%s’ directive argument is null [-Wformat-overflow=]
__builtin_sprintf (d, "%s", p);
>From gcc-bugs-return-613718-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 19:36:06 2018
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From: "richard-gccbugzilla at metafoo dot co.uk" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87097] New: value-initialization of an array of more than 1 element not treated as a constant initializer
Date: Fri, 24 Aug 2018 19:36:00 -0000
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Bug ID: 87097
Summary: value-initialization of an array of more than 1
element not treated as a constant initializer
Product: gcc
Version: unknown
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Priority: P3
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Live testcase: https://godbolt.org/z/1JYWJS
For posterity:
struct A {
constexpr A() : data() {}
struct X { int n; };
X data[2];
};
static_assert((A(), true));
static_assert(A().data[0].n == 0);
static_assert(A().data[1].n == 0);
constexpr A x;
GCC rejects this valid code with:
<source>:9:29: error: non-constant condition for static assertion
9 | static_assert(A().data[1].n == 0);
| ~~~~~~~~~~~~~~^~~~
<source>:9:29: error: accessing uninitialized member 'A::X::n'
<source>:10:13: error: 'A{A::X [2]{A::X{0}, A::X()}}' is not a constant
expression
10 | constexpr A x;
|
Looks like GCC fails to evaluate the initializer of the second and subsequent
elements of a value-initialized array during constant evaluation.
>From gcc-bugs-return-613719-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 19:39:18 2018
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Subject: [Bug c++/87097] value-initialization of an array of more than 1 element not treated as a constant initializer
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-08-24
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed. Doesn't seem to be a regression.
>From gcc-bugs-return-613720-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 19:42:42 2018
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From: "vlad at ispras dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87076] -mpcu/-march not propagated through LTO bytecode (ice/segfault if arch flags do not match)
Date: Fri, 24 Aug 2018 19:42:00 -0000
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--- Comment #4 from Vladislav Ivanishin <vlad at ispras dot ru> ---
"rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> writes:
> On x86_64 the actual -march switch isn't serialized but it is decomposed into
> individual -mFEATURE switches by the driver which are serialized.
>
>
> The -march switch also appears in the lto_opts LTO section and should be
> handed off to the linker by lto-wrapper as well.
>
> You can check that by looking at -v output of the link command and/or
> looking at the lto_opts section in the object files.
Indeed, the -march switch makes it into .gnu.lto_.opts. However, when
lto-wrapper constructs the argument string in run_gcc(), it takes those
options (append_compiler_options()) and then appends the contents of
COLLECT_GCC_OPTIONS (append_linker_options()) to them.
COLLECT_GCC_OPTIONS is set by the topmost gcc driver to
... -mcpu=arm7tdmi -marm -march=armv4t
(these options come from evaluation of the DRIVER_SELF_SPECS spec
string).
So the LTO compiler is then invoked with something like
... -march=armv7-r ... -mcpu=arm7tdmi -marm -march=armv4t
The last -march takes effect. The ARM backend seems to infer -mFEATUREs
from -mcpu and -march rather than trying to deserialize from the file.
I drew this conclusion from looking at
gcc/config/arm/arm.c: arm_configure_build_target():
...
if (arm_selected_arch)
{
arm_initialize_isa (target->isa, arm_selected_arch->common.isa_bits);
...
if (arm_selected_cpu)
{
arm_initialize_isa (cpu_isa, arm_selected_cpu->common.isa_bits);
>From gcc-bugs-return-613721-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 20:00:53 2018
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From: "rly1 at embarqmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87098] New: compiling program icetime.cc for icestorm fpga toolchain throws internal compiler error
Date: Fri, 24 Aug 2018 20:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87098
Bug ID: 87098
Summary: compiling program icetime.cc for icestorm fpga
toolchain throws internal compiler error
Product: gcc
Version: 6.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rly1 at embarqmail dot com
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Created attachment 44592
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44592&action=edit
g++ -E output for icetime.cc (gzipped)
compiler failure building https://github.com/cliffordwolf/icestorm program
icetime.cc on rev C beaglebone black sbc w/ debian version 9.5 and g++ from
os distribution. Both the OS and icestorm are up to date as of 1255
24-aug-2018.
A preprocessed (g++ -E) version of the icetime.cc program is attached.
thanks
-ron
root@arm:/home/debian/icestorm# uname -a
Linux arm 4.14.41-bone14 #1 PREEMPT Sun May 20 18:41:10 CEST 2018 armv7l
GNU/Linux
root@arm:/home/debian/icestorm# free
total used free shared buff/cache available
Mem: 497188 31552 307332 9808 158304 444628
Swap: 0 0 0
root@arm:/home/debian/icestorm# g++ --version
g++ (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
make -C icetime all
make[1]: Entering directory '/home/debian/icestorm/icetime'
g++ -MD -O0 -ggdb -Wall -std=c++11 -I/usr/local/include -DPREFIX='"/usr/local"'
-DCHIPDB_SUBDIR='"icebox"' -c -o icetime.o icetime.cc
g++: internal compiler error: Killed (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-6/README.Bugs> for instructions.
<builtin>: recipe for target 'icetime.o' failed
make[1]: *** [icetime.o] Error 4
make[1]: Leaving directory '/home/debian/icestorm/icetime'
Makefile:8: recipe for target 'icetime.all' failed
make: *** [icetime.all] Error 2
>From gcc-bugs-return-613722-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 20:13:12 2018
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Subject: [Bug c++/87098] compiling program icetime.cc for icestorm fpga toolchain throws internal compiler error
Date: Fri, 24 Aug 2018 20:13:00 -0000
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Ron Young <rly1 at embarqmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |WORKSFORME
--- Comment #1 from Ron Young <rly1 at embarqmail dot com> ---
In further researching this, it appears that this was caused by running out of
memory, adding additional swap allow it to compile.
sorry...
-ron
>From gcc-bugs-return-613723-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 24 21:18:25 2018
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87091] Malformed fix-it hint for missing header
Date: Fri, 24 Aug 2018 21:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87091
--- Comment #3 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Author: dmalcolm
Date: Fri Aug 24 21:17:48 2018
New Revision: 263843
URL: https://gcc.gnu.org/viewcvs?rev=263843&root=gcc&view=rev
Log:
diagnostics: tweaks to line-spans vs line numbering (PR 87091)
This patch tweaks how line numbers are printed for a diagnostic
containing multiple line spans.
With this patch, rather than printing span headers:
../x86_64-pc-linux-gnu/libstdc++-v3/include/vector:87:22: note: message
../x86_64-pc-linux-gnu/libstdc++-v3/include/vector:74:1:
++ |+#include <vector>
74 | #endif
../x86_64-pc-linux-gnu/libstdc++-v3/include/vector:87:22:
87 | using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
| ^~~
we now print:
../x86_64-pc-linux-gnu/libstdc++-v3/include/vector:87:22: note: message
+++ |+#include <vector>
74 | #endif
....
87 | using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
| ^~~
and for sufficiently close lines, rather than print a gap:
+ |+#include <stdio.h>
1 | test (int ch)
..
3 | putchar (ch);
| ^~~~~~~
we print the line itself:
+ |+#include <stdio.h>
1 | test (int ch)
2 | {
3 | putchar (ch);
| ^~~~~~~
gcc/ChangeLog:
PR 87091
* diagnostic-show-locus.c (layout::layout): Ensure the margin is
wide enough for jumps in the line-numbering to be visible.
(layout::print_gap_in_line_numbering): New member function.
(layout::calculate_line_spans): When using line numbering, merge
line spans that are only 1 line apart.
(diagnostic_show_locus): When printing line numbers, show gaps in
line numbering directly, rather than printing headers.
(selftest::test_diagnostic_show_locus_fixit_lines): Add test of
line-numbering with multiple line spans.
(selftest::test_fixit_insert_containing_newline_2): Add test of
line-numbering, in which the spans are close enough to be merged.
gcc/testsuite/ChangeLog:
PR 87091
* gcc.dg/missing-header-fixit-3.c: Update for changes to how
line spans are printed with -fdiagnostics-show-line-numbers.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/diagnostic-show-locus.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/missing-header-fixit-3.c
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Subject: [Bug middle-end/87052] STRING_CST printing incomplete in Gimple dumps
Date: Fri, 24 Aug 2018 21:50:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Done in r263781.
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Subject: [Bug fortran/86837] [8/9 Regression] Optimization breaks an unformatted read with implicit loop
Date: Fri, 24 Aug 2018 22:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86837
--- Comment #7 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Fri Aug 24 22:08:48 2018
New Revision: 263844
URL: https://gcc.gnu.org/viewcvs?rev=263844&root=gcc&view=rev
Log:
2018-08-24 Thomas Koenig <tkoenig@gcc.gnu.org>
Backport from trunk
PR fortran/86837
* frontend-passes.c (var_in_expr_callback): New function.
(var_in_expr): New function.
(traverse_io_block): Use var_in_expr instead of
gfc_check_dependency for checking if the variable depends on the
previous interators.
2018-08-24 Thomas Koenig <tkoenig@gcc.gnu.org>
Backport from trunk
PR fortran/86837
* gfortran.dg/implied_do_io_6.f90: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/gfortran.dg/implied_do_io_6.f90
Modified:
branches/gcc-8-branch/gcc/fortran/ChangeLog
branches/gcc-8-branch/gcc/fortran/frontend-passes.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/86837] [8/9 Regression] Optimization breaks an unformatted read with implicit loop
Date: Fri, 24 Aug 2018 22:10:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #8 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Fixed on all affected branches, closing.
Thanks a lot for the bug report!
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Subject: [Bug web/87050] Bump wwwdocs to html5
Date: Fri, 24 Aug 2018 22:44:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org,
| |egallager at gcc dot gnu.org
--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to joseph@codesourcery.com from comment #6)
> A replacement for MetaHTML is already available, we just need to switch to
> using it.
>
> https://gcc.gnu.org/ml/gcc-patches/2018-06/msg00176.html
cc-ing its author
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Subject: [Bug c/82967] "did you mean" suggestions are way too suggestive
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
URL| |https://gcc.gnu.org/ml/gcc-
| |patches/2018-08/msg01542.ht
| |ml
--- Comment #7 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to David Malcolm from comment #6)
> Candidate patch: https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01542.html
adding "patch" keyword
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Subject: [Bug bootstrap/86872] [9 Regression] LTO bootstrap failed with profiledbootstrap
Date: Fri, 24 Aug 2018 23:38:00 -0000
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--- Comment #6 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Fri Aug 24 23:37:53 2018
New Revision: 263845
URL: https://gcc.gnu.org/viewcvs?rev=263845&root=gcc&view=rev
Log:
Set start_location to 0 if we ran out of line map space
With profiledbootstrap and --with-build-config=bootstrap-lto, linemap_add
may create a macro map when we run out of line map space. This patch
changes start_location to UNKNOWN_LOCATION (0) in this case.
Tested with profiledbootstrap and --with-build-config=bootstrap-lto on
Linux/x86-64.
PR bootstrap/86872
* line-map.c (pure_location_p): Return true if linemap_lookup
returns NULL.
(linemap_add): Set start_location to 0 if we run out of line map
space.
Modified:
trunk/libcpp/ChangeLog
trunk/libcpp/line-map.c
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From: "moron at waifu dot club" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/87099] New: internal compiler error: segmentation fault
Date: Sat, 25 Aug 2018 00:36:00 -0000
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Bug ID: 87099
Summary: internal compiler error: segmentation fault
Product: gcc
Version: 8.2.0
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Priority: P3
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Created attachment 44593
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44593&action=edit
the preprocessed file from -save-temps
Code to reproduce:
#include <stdio.h>
#include <string.h>
int main(int argc, char const *argv[]){
char myArray[argc];
int a = strncmp(&(myArray[1]),"aaaa",3);
return 0;
}
Compiler command to reproduce:
gcc test.c
Note:
This does not happen if the size of myArray is just a constant number. If the
strlen of the second argument to strncmp is less than the third argument, the
bug does not happen. If you remove the "int a = " part and just do nothing with
the return value of strncmp then the bug does not happen. I was able to compile
this code last month, probably using GCC 8.1.
Output with verbose:
gcc -save-temps --verbose test4.c
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --enable-multilib --disable-werror
--enable-checking=release --enable-default-pie --enable-default-ssp
--enable-cet=auto
Thread model: posix
gcc version 8.2.0 (GCC)
COLLECT_GCC_OPTIONS='-save-temps' '-v' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/cc1 -E -quiet -v test4.c -mtune=generic
-march=x86-64 -fpch-preprocess -o test4.i
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include
/usr/local/include
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include-fixed
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-save-temps' '-v' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/cc1 -fpreprocessed test4.i -quiet
-dumpbase test4.c -mtune=generic -march=x86-64 -auxbase test4 -version -o
test4.s
GNU C17 (GCC) version 8.2.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 8.2.0, GMP version 6.1.2, MPFR version 4.0.1,
MPC version 1.1.0, isl version isl-0.19-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C17 (GCC) version 8.2.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 8.2.0, GMP version 6.1.2, MPFR version 4.0.1,
MPC version 1.1.0, isl version isl-0.19-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 374c644ab4db4fa02e30fa5669d43e86
during RTL pass: expand
test4.c: In function ‘main’:
test4.c:6:10: internal compiler error: Segmentation fault
int a = strncmp(&(myArray[1]),"aaaa",3);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.archlinux.org/> for instructions.
>From gcc-bugs-return-613731-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 25 02:51:21 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/81958] spurious -Wmaybe-uninitialized warning in gcc-8, or with -O1
Date: Sat, 25 Aug 2018 02:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81958
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jeffrey A. Law from comment #1)
> So I see a couple things here.
>
> In DOM we do catch the fact that eqidx will have the value zero if the loop
> does not iterate. But the equivalence we record is actually eqidx >=
> maxidx. That's because we don't cprop into the conditionals in
> record_temporary_equivalences. We *should* do that, but we have to be
> careful about structure sharing and I'd like to avoid creating a lot of
> unnecessary tree nodes if it can be avoided.
>
> If we were to fix that, we'd end recording maxidx <= 0. Given that maxidx
> is unsigned that simplifies into maxidx == 0. Of course we don't those kind
> of simplifications when recording the temporary equivalences either and the
> same concerns WRT structure sharing come into play.
>
> When things simplify into something like maxidx == 0, instead of recording a
> conditional into the equivalency tables, we should record that maxidx = 0 in
> the const/copies table.
>
> If we were to fix those 3 issues, then I think we have all the key pieces in
> place to see the jump thread. But we still have to be concerned that jump
> threading may be suppressed because of its conservatism WRT not clobbering
> the loop structure. It should be safe in this case, but I don't offhand
> know if the suppression code would kick in or not.
>
> So, anyway, there's several TODO items in here.
So, split into separate bugs? Or leave as just this one?
>From gcc-bugs-return-613732-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 25 03:03:51 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/43105] Document restrictions on mixing -fno-rtti and -frtti
Date: Sat, 25 Aug 2018 03:03:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |gerald at pfeifer dot com,
| |joseph at codesourcery dot com,
| |sandra at codesourcery dot com
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing docs co-maintainers
>From gcc-bugs-return-613733-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 25 09:03:05 2018
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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/70694] 50 experimental/filesystem/* failures on x86_64-apple-darwin10
Date: Sat, 25 Aug 2018 09:03:00 -0000
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--- Comment #8 from Iain Sandoe <iains at gcc dot gnu.org> ---
Author: iains
Date: Sat Aug 25 09:02:28 2018
New Revision: 263850
URL: https://gcc.gnu.org/viewcvs?rev=263850&root=gcc&view=rev
Log:
Don't force visibility to hidden for Darwin > 8.
PR libstdc++/70694
* configure.host (OPT_LDFLAGS): Don't append
-fvisibility-inlines-hidden for newer Darwin.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/configure.host
>From gcc-bugs-return-613734-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 25 09:28:16 2018
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Subject: [Bug lto/87089] [9 regression] tree check: expected class 'type', have 'declaration' (namespace_decl) in type_with_linkage_p, at ipa-utils.h
Date: Sat, 25 Aug 2018 09:28:00 -0000
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--- Comment #2 from Dmitry G. Dyachenko <dimhen at gmail dot com> ---
gcc invocation can be simplified : -fno-semantic-interposition can be removed.
(was needed while creducing original testcase)
So,
$ g++ -fpreprocessed -O2 -flto -fPIC -DPIC -c -o a.o a.ii
$ g++ -fpreprocessed -O2 -flto -fPIC -DPIC -c -o b.o b.ii
$ g++ -flto -fPIC -DPIC -shared a.o b.o
>From gcc-bugs-return-613735-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 25 10:38:09 2018
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To: gcc-bugs@gcc.gnu.org
From: Peter Dyballa <Peter_Dyballa@Freenet.DE>
Subject: Building libgcc/GCC 7.3.0 fails on PowerPC 7447A with Mac OS X 10.4.11 (Tiger) because three files differ between stages 2 and 3
Date: Sat, 25 Aug 2018 10:38:00 -0000
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Hello!
This happens when using the MacPorts package manager. First build
went fine, then packages like cctools and ld64 were upgraded, so
libgcc/GCC 7.3.0 had to be upgraded too. The new build fails
constantly with
rm -f stage_current
make[3]: Leaving directory `/opt/local/var/macports/build/
_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarbal
ls_ports_lang_gcc7/libgcc7/work/build'
Comparing stages 2 and 3
warning: gcc/cc1obj-checksum.o differs
warning: gcc/cc1objplus-checksum.o differs
Bootstrap comparison failure!
gcc/host-darwin.o differs
make[2]: *** [compare] Error 1
make[2]: Leaving directory `/opt/local/var/macports/build/
_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarbal
ls_ports_lang_gcc7/libgcc7/work/build'
make[1]: *** [stage3-bubble] Error 2
make[1]: Leaving directory `/opt/local/var/macports/build/
_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarbal
ls_ports_lang_gcc7/libgcc7/work/build'
make: *** [bootstrap-lean] Error 2
make: Leaving directory `/opt/local/var/macports/build/
_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarbal
ls_ports_lang_gcc7/libgcc7/work/build'
Command failed: cd "/opt/local/var/macports/build/
_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarbal
ls_ports_lang_gcc7/libgcc7/work/build" && /usr/bin/make -w bootstrap-
lean
Exit code: 2
Configuration happens with:
--prefix=/opt/local --build=ppc-apple-darwin8 --enable-languages=c,c+
+,objc,obj-c++,lto,fortran --libdir=/opt/local/lib/libgcc --
includedir=/opt/local/include/gcc --infodir=/opt/local/share/info --
mandir=/opt/local/share/man --datarootdir=/opt/local/share/gcc-7 --
with-local-prefix=/opt/local --with-system-zlib --disable-nls --
program-suffix=-mp-7 --with-gxx-include-dir=/opt/local/include/gcc/c+
+/ --with-gmp=/opt/local --with-mpfr=/opt/local --with-mpc=/opt/local
--with-isl=/opt/local --enable-stage1-checking --disable-multilib --
enable-lto --enable-libstdcxx-time --with-build-config=bootstrap-
debug --with-as=/opt/local/bin/as --with-ld=/opt/local/bin/ld --with-
ar=/opt/local/bin/ar --with-bugurl=https://trac.macports.org/
newticket --disable-tls --with-pkgversion="…"
The explicitely named tools /opt/local/bin/{ar,as} (plus nm, libtool,
ranlib, strings, strip) are from the package cctools @895_7, the
named tool /opt/local/bin/ld comes from the package ld64 @3_1.
The case with build logs is also documented here: https://
trac.macports.org/ticket/56922.
Can I try something else to try to fix the problem?
--
Greetings
Pete
A blizzard is when it snows sideways.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/85559] [meta-bug] Improve conditional move
[not found] <bug-85559-4@http.gcc.gnu.org/bugzilla/>
2018-08-10 9:44 ` [Bug middle-end/85559] [meta-bug] Improve conditional move marxin at gcc dot gnu.org
@ 2021-07-20 0:45 ` pinskia at gcc dot gnu.org
2021-08-14 23:12 ` pinskia at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-07-20 0:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85559
Bug 85559 depends on bug 46279, which changed state.
Bug 46279 Summary: cmov not hoisted out of the loop
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46279
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/85559] [meta-bug] Improve conditional move
[not found] <bug-85559-4@http.gcc.gnu.org/bugzilla/>
2018-08-10 9:44 ` [Bug middle-end/85559] [meta-bug] Improve conditional move marxin at gcc dot gnu.org
2021-07-20 0:45 ` pinskia at gcc dot gnu.org
@ 2021-08-14 23:12 ` pinskia at gcc dot gnu.org
2023-05-30 7:41 ` pinskia at gcc dot gnu.org
2024-05-06 21:39 ` roger at nextmovesoftware dot com
4 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-08-14 23:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85559
Bug 85559 depends on bug 65492, which changed state.
Bug 65492 Summary: Bad optimization in -O3 due to if-conversion and/or unrolling
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65492
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/85559] [meta-bug] Improve conditional move
[not found] <bug-85559-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2021-08-14 23:12 ` pinskia at gcc dot gnu.org
@ 2023-05-30 7:41 ` pinskia at gcc dot gnu.org
2024-05-06 21:39 ` roger at nextmovesoftware dot com
4 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-05-30 7:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85559
Bug 85559 depends on bug 85390, which changed state.
Bug 85390 Summary: [10/11/12/13/14 Regression] possible missed optimisation / regression from 6.3 with conditional expression
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85390
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/85559] [meta-bug] Improve conditional move
[not found] <bug-85559-4@http.gcc.gnu.org/bugzilla/>
` (3 preceding siblings ...)
2023-05-30 7:41 ` pinskia at gcc dot gnu.org
@ 2024-05-06 21:39 ` roger at nextmovesoftware dot com
4 siblings, 0 replies; 5+ messages in thread
From: roger at nextmovesoftware dot com @ 2024-05-06 21:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85559
Bug 85559 depends on bug 78947, which changed state.
Bug 78947 Summary: sub-optimal code for (bool)(int ? int : int)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78947
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
^ permalink raw reply [flat|nested] 5+ messages in thread
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[not found] <bug-85559-4@http.gcc.gnu.org/bugzilla/>
2018-08-10 9:44 ` [Bug middle-end/85559] [meta-bug] Improve conditional move marxin at gcc dot gnu.org
2021-07-20 0:45 ` pinskia at gcc dot gnu.org
2021-08-14 23:12 ` pinskia at gcc dot gnu.org
2023-05-30 7:41 ` pinskia at gcc dot gnu.org
2024-05-06 21:39 ` roger at nextmovesoftware dot com
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