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* [Bug c++/70808] Spurious -Wzero-as-null-pointer-constant for nullptr_t
[not found] <bug-70808-4@http.gcc.gnu.org/bugzilla/>
@ 2018-04-27 16:55 ` redi at gcc dot gnu.org
0 siblings, 0 replies; only message in thread
From: redi at gcc dot gnu.org @ 2018-04-27 16:55 UTC (permalink / raw)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70808
--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This causes a regression for:
using T = decltype(nullptr);
const constexpr T foo{};
np.cc:2:23: error: ‘(const T)nullptr’ is not a constant expression
const constexpr T foo{};
^
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Subject: [Bug c++/84691] [6/7/8/9 Regression] internal compiler error: in poplevel_class, at cp/name-lookup.c:4430
Date: Fri, 27 Apr 2018 16:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84691
--- Comment #4 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Fri Apr 27 16:56:55 2018
New Revision: 259716
URL: https://gcc.gnu.org/viewcvs?rev=259716&root=gcc&view=rev
Log:
/cp
2018-04-27 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84691
* decl.c (grokdeclarator): Clear friendp upon definition in local
class definition error.
/testsuite
2018-04-27 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84691
* g++.dg/cpp0x/friend3.C: New.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/friend3.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/decl.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/84691] [6/7/8 Regression] internal compiler error: in poplevel_class, at cp/name-lookup.c:4430
Date: Fri, 27 Apr 2018 16:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84691
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[6/7/8/9 Regression] |[6/7/8 Regression] internal
|internal compiler error: in |compiler error: in
|poplevel_class, at |poplevel_class, at
|cp/name-lookup.c:4430 |cp/name-lookup.c:4430
--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed in trunk so far.
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Subject: [Bug c++/85545] [8 Regression] ICE with static_cast of pointer-to-member-function
Date: Fri, 27 Apr 2018 17:09:00 -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: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/70808] Spurious -Wzero-as-null-pointer-constant for nullptr_t
Date: Fri, 27 Apr 2018 17:14:00 -0000
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--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
That's now PR 85553
>From gcc-bugs-return-602908-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 27 17:14:35 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++/85553] New: [8/9 Regression] cannot list-initialize a variable of type std::nullptr_t
Date: Fri, 27 Apr 2018 17:14:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85553
Bug ID: 85553
Summary: [8/9 Regression] cannot list-initialize a variable of
type std::nullptr_t
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
CC: paolo at gcc dot gnu.org
Target Milestone: ---
THe fix for PR 70808 (r259303) causes this valid code to be rejected:
using T = decltype(nullptr);
const constexpr T foo{};
np.cc:2:23: error: '(const T)nullptr' is not a constant expression
const constexpr T foo{};
^
Reverting r259303 fixes it.
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Subject: [Bug c++/85553] [8/9 Regression] cannot list-initialize a variable of type std::nullptr_t
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-27
CC| |jason at gcc dot gnu.org
Ever confirmed|0 |1
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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++/85553] [8/9 Regression] cannot list-initialize a variable of type std::nullptr_t
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
Target Milestone|--- |8.0
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So shouldn't we then do instead:
--- gcc/cp/init.c.jj 2018-04-27 19:11:56.613549524 +0200
+++ gcc/cp/init.c 2018-04-27 19:20:50.102839130 +0200
@@ -180,8 +180,10 @@ build_zero_init_1 (tree type, tree nelts
items with static storage duration that are not otherwise
initialized are initialized to zero. */
;
- else if (TYPE_PTR_OR_PTRMEM_P (type) || NULLPTR_TYPE_P (type))
+ else if (TYPE_PTR_OR_PTRMEM_P (type))
init = fold (convert (type, nullptr_node));
+ else if (NULLPTR_TYPE_P (type))
+ init = build_int_cst (type, 0);
else if (SCALAR_TYPE_P (type))
init = fold (convert (type, integer_zero_node));
else if (RECORD_OR_UNION_CODE_P (TREE_CODE (type)))
Then we don't warn on cpp0x/Wzero-as-null-pointer-constant-3.C and accept the
value initialization in constexpr.
>From gcc-bugs-return-602912-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 27 17:31:22 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85553] [8/9 Regression] cannot list-initialize a variable of type std::nullptr_t
Date: Fri, 27 Apr 2018 17:31:00 -0000
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--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Thanks Jakub for looking into this. For sure, the whole fold and convert
machinery should not be necessary for something this simple, but, to be honest,
isn't immediately obvious to me why it does the wrong thing in this case.
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Subject: [Bug c++/85553] [8/9 Regression] cannot list-initialize a variable of type std::nullptr_t
Date: Fri, 27 Apr 2018 17:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85553
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Paolo Carlini from comment #2)
> Thanks Jakub for looking into this. For sure, the whole fold and convert
> machinery should not be necessary for something this simple, but, to be
> honest, isn't immediately obvious to me why it does the wrong thing in this
> case.
Because it isn't folded into INTEGER_CST, but NOP_EXPR with the
decltype(nullptr) type wrapping zero INTEGER_CST and constexpr.c doesn't
consider that a valid reduced constant expression.
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85553] [8/9 Regression] cannot list-initialize a variable of type std::nullptr_t
Date: Fri, 27 Apr 2018 17:51:00 -0000
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--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
I see. Then, my humble opinion (we got Jason in CC, anyway) is that if we are
still hoping to have this fixed in 8.1.0 we should just go ahead with something
rather straightforward like your tweak, otherwise we should probably
investigate the constexpr.c behavior a little more, because I don't really see
why going from integer_zero_node to NULLPTR_TYPE_P is "better" than going from
nullptr_node to NULLPTR_TYPE_P, if you see what I mean.
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From: "ian at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug go/85429] Several gotools tests FAIL with Solaris as
Date: Fri, 27 Apr 2018 18:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85429
--- Comment #3 from ian at gcc dot gnu.org <ian at gcc dot gnu.org> ---
Author: ian
Date: Fri Apr 27 18:01:00 2018
New Revision: 259719
URL: https://gcc.gnu.org/viewcvs?rev=259719&root=gcc&view=rev
Log:
PR go/85429
cmd/go: add Solaris assembler syntax for gccgo buildid file
The Solaris assembler uses a different syntax for section directives.
This is https://golang.org/cl/109140 ported over to gccgo.
Reviewed-on: https://go-review.googlesource.com/109141
Modified:
trunk/gcc/go/gofrontend/MERGE
trunk/libgo/go/cmd/go/internal/work/buildid.go
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From: "ian at airs dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug go/85429] Several gotools tests FAIL with Solaris as
Date: Fri, 27 Apr 2018 18:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85429
Ian Lance Taylor <ian at airs dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Ian Lance Taylor <ian at airs dot com> ---
Should be fixed on tip, requested permission to backport to GCC 8 branch.
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From: "me at adhokshajmishraonline dot in" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85554] New: GCC does not instantiate template function when only used as a function type
Date: Fri, 27 Apr 2018 18:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85554
Bug ID: 85554
Summary: GCC does not instantiate template function when only
used as a function type
Product: gcc
Version: unknown
Status: UNCONFIRMED
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Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: me at adhokshajmishraonline dot in
Target Milestone: ---
Proof of concept:
=================
template<typename T>
auto make_value(){
return T{};
}
template<typename F>
auto call(F func){
return func();
}
int main(){
auto result = call(make_value<double>);
return 0;
}
Compiling with G++
==================
â•â”€ adhokshajmishra@andromeda î‚° in /tmp î‚°
╰─➤ g++ --version
g++ (GCC) 7.3.1 20180406
Copyright (C) 2017 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.
â•â”€ adhokshajmishra@andromeda î‚° in /tmp î‚°
╰─➤ g++ test.cpp -o test -std=c++17
test.cpp: In function ‘int main()’:
test.cpp:12:42: error: no matching function for call to ‘call(<unresolved
overloaded function type>)’
auto result = call(make_value<double>);
^
test.cpp:7:6: note: candidate: template<class F> auto call(F)
auto call(F func){
^~~~
test.cpp:7:6: note: template argument deduction/substitution failed:
test.cpp:12:42: note: couldn't deduce template parameter ‘F’
auto result = call(make_value<double>);
^
Compiling with Clang: no error
As per [http://eel.is/c++draft/temp#inst-4.sentence-1], GCC seems to be wrong
here.
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Subject: [Bug c++/85515] Bogus suggestions from "GCC's leaky abstractions"
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--- Comment #5 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Author: dmalcolm
Date: Fri Apr 27 18:39:18 2018
New Revision: 259720
URL: https://gcc.gnu.org/viewcvs?rev=259720&root=gcc&view=rev
Log:
Don't offer suggestions for compiler-generated variables (PR c++/85515)
gcc/cp/ChangeLog:
PR c++/85515
* name-lookup.c (consider_binding_level): Skip compiler-generated
variables.
* search.c (lookup_field_fuzzy_info::fuzzy_lookup_field): Flatten
nested if statements into a series of rejection tests. Reject
lambda-ignored entities as suggestions.
gcc/testsuite/ChangeLog:
PR c++/85515
* g++.dg/pr85515-1.C: New test.
* g++.dg/pr85515-2.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/pr85515-1.C
trunk/gcc/testsuite/g++.dg/pr85515-2.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/name-lookup.c
trunk/gcc/cp/search.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug go/85429] Several gotools tests FAIL with Solaris as
Date: Fri, 27 Apr 2018 18:45:00 -0000
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--- Comment #5 from ian at gcc dot gnu.org <ian at gcc dot gnu.org> ---
Author: ian
Date: Fri Apr 27 18:44:28 2018
New Revision: 259721
URL: https://gcc.gnu.org/viewcvs?rev=259721&root=gcc&view=rev
Log:
PR go/85429
cmd/go: add Solaris assembler syntax for gccgo buildid file
The Solaris assembler uses a different syntax for section directives.
This is https://golang.org/cl/109140 ported over to gccgo.
Reviewed-on: https://go-review.googlesource.com/109141
Modified:
branches/gcc-8-branch/libgo/go/cmd/go/internal/work/buildid.go
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Subject: [Bug libgcc/84292] __sync_add_and_fetch returns the old value instead of the new value
Date: Fri, 27 Apr 2018 19:14:00 -0000
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--- Comment #5 from Andreas Tobler <andreast at gcc dot gnu.org> ---
Author: andreast
Date: Fri Apr 27 19:14:05 2018
New Revision: 259722
URL: https://gcc.gnu.org/viewcvs?rev=259722&root=gcc&view=rev
Log:
2018-04-27 Andreas Tobler <andreast@gcc.gnu.org>
Maryse Levavasseur <maryse.levavasseur@stormshield.eu>
PR libgcc/84292
* config/arm/freebsd-atomic.c (SYNC_OP_AND_FETCH_N): Fix the
op_and_fetch to return the right result.
Modified:
trunk/libgcc/ChangeLog
trunk/libgcc/config/arm/freebsd-atomic.c
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85492
--- Comment #3 from Jim Wilson <wilson at gcc dot gnu.org> ---
I figured out that I wasn't fully rebuilding and relinking all libraries while
trying to debug this with printf, and that sent me down the wrong path.
Trying this again, correctly, I see that we have a loop in unwind, because the
return address for _start is pointing at _start. This works by accident when
static linking, because crt1.o is included before crtbegin.o, crtbegin.o
registers FDEs starting from a label it adds to the eh_frame section, and hence
the FDE for _start in crt1.o gets lost. When unwinding, we see that there is
no FDE for _start, and it isn't an exception frame, so that terminates
unwinding. When dynamic linking, we use PT_GNU_EH_FRAME which uses eh_frame
section addresses and hence finds every FDE, including the one for _start, so
we try to unwind through _start, get a return address pointing at _start, and
go into an infinite loop.
This requires a glibc patch to fix. Just setting the return address in _start
to 0 works.
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--- Comment #4 from Jim Wilson <wilson at gcc dot gnu.org> ---
Created attachment 44032
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44032&action=edit
proposed glibc patch to fix the problem
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Subject: [Bug c++/85553] [8/9 Regression] cannot list-initialize a variable of type std::nullptr_t
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Apr 27 20:29:12 2018
New Revision: 259728
URL: https://gcc.gnu.org/viewcvs?rev=259728&root=gcc&view=rev
Log:
PR c++/85553
* init.c (build_zero_init_1): For zero initialization of
NULLPTR_TYPE_P type use build_int_cst directly.
* g++.dg/cpp0x/Wzero-as-null-pointer-constant-3.C: Add dg-bogus
directive.
* g++.dg/cpp0x/constexpr-85553.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-85553.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/init.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/cpp0x/Wzero-as-null-pointer-constant-3.C
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Apr 27 20:30:56 2018
New Revision: 259729
URL: https://gcc.gnu.org/viewcvs?rev=259729&root=gcc&view=rev
Log:
PR c++/85553
* init.c (build_zero_init_1): For zero initialization of
NULLPTR_TYPE_P type use build_int_cst directly.
* g++.dg/cpp0x/Wzero-as-null-pointer-constant-3.C: Add dg-bogus
directive.
* g++.dg/cpp0x/constexpr-85553.C: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/cpp0x/constexpr-85553.C
Modified:
branches/gcc-8-branch/gcc/cp/ChangeLog
branches/gcc-8-branch/gcc/cp/init.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
branches/gcc-8-branch/gcc/testsuite/g++.dg/cpp0x/Wzero-as-null-pointer-constant-3.C
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Subject: [Bug ipa/85549] [8/9 Regression] Infinite loop in ilmbase package
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Apr 27 20:32:18 2018
New Revision: 259730
URL: https://gcc.gnu.org/viewcvs?rev=259730&root=gcc&view=rev
Log:
PR ipa/85549
* ipa-cp.c (find_aggregate_values_for_callers_subset): Make sure
the jump function allows for passing through aggregate values.
* g++.dg/ipa/pr85549.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/ipa/pr85549.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ipa-cp.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/85492] riscv64: endless loop when throwing an exception from a constructor
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--- Comment #5 from palmer at gcc dot gnu.org ---
Thanks Jim. This looks good to me, are you comfortable submitting glibc
patches? If so then I'll commit it, otherwise I can send it out myself.
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Subject: [Bug c++/85553] [8/9 Regression] cannot list-initialize a variable of type std::nullptr_t
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug ipa/85549] [8/9 Regression] Infinite loop in ilmbase package
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Apr 27 20:32:53 2018
New Revision: 259731
URL: https://gcc.gnu.org/viewcvs?rev=259731&root=gcc&view=rev
Log:
PR ipa/85549
* ipa-cp.c (find_aggregate_values_for_callers_subset): Make sure
the jump function allows for passing through aggregate values.
* g++.dg/ipa/pr85549.C: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/ipa/pr85549.C
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/ipa-cp.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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Subject: [Bug ipa/85549] [8/9 Regression] Infinite loop in ilmbase package
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |jakub at gcc dot gnu.org
Resolution|--- |FIXED
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed by Martin's patch.
>From gcc-bugs-return-602930-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 27 21:39:00 2018
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From: "wilson at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85492] riscv64: endless loop when throwing an exception from a constructor
Date: Fri, 27 Apr 2018 21:39:00 -0000
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--- Comment #6 from Jim Wilson <wilson at gcc dot gnu.org> ---
I suggest you handle the glibc patch.
Note that you can probably also fix this by adding unwind direcives to _start
to say that the return address is in x0. This would avoid the minor code size
increase, but takes a little more effort to figure out how to add the right
unwind directives to assembly code to make this work. I haven't tried that.
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Subject: [Bug c++/85554] GCC does not instantiate template function when only used as a function type
Date: Fri, 27 Apr 2018 21:44:00 -0000
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think this is a dup of bug 64194.
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Subject: [Bug testsuite/85527] [openacc] atomic_capture-1.{c,f90} undefined behaviour
Date: Fri, 27 Apr 2018 22:11:00 -0000
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--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Fri Apr 27 22:11:12 2018
New Revision: 259733
URL: https://gcc.gnu.org/viewcvs?rev=259733&root=gcc&view=rev
Log:
[openacc, testsuite] Fix undefined behaviour in atomic_capture-1.f90
2018-04-28 Tom de Vries <tom@codesourcery.com>
PR testsuite/85527
* testsuite/libgomp.oacc-fortran/atomic_capture-1.f90 (main): Store
atomic capture results obtained in parallel loop to an array, instead
of
to a scalar.
Modified:
trunk/libgomp/ChangeLog
trunk/libgomp/testsuite/libgomp.oacc-fortran/atomic_capture-1.f90
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Subject: [Bug c++/85554] GCC does not instantiate template function when only used as a function type
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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> ---
Yes this is definitely PR 64194
*** This bug has been marked as a duplicate of bug 64194 ***
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Subject: [Bug c++/64194] [C++14] <unresolved overloaded function type> for function template with auto return
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CC| |me at adhokshajmishraonline dot in
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 85554 has been marked as a duplicate of this bug. ***
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85526] [6/7/8/9 regression] ICE when calling a (pure) function from inside another pure function
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kargl at gcc dot gnu.org changed:
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--- Comment #7 from kargl at gcc dot gnu.org ---
This is actually a duplicate of PR 85138. Comment #6
should be added to that PR.
*** This bug has been marked as a duplicate of bug 85138 ***
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Subject: [Bug fortran/85138] [8/9 regression] ICE with generic function
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kargl at gcc dot gnu.org changed:
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CC| |mail at pietrodelugas dot it
--- Comment #10 from kargl at gcc dot gnu.org ---
*** Bug 85526 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-602937-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 27 23:31:46 2018
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85138] [8/9 regression] ICE with generic function
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--- Comment #11 from kargl at gcc dot gnu.org ---
(In reply to kargl from comment #10)
> *** Bug 85526 has been marked as a duplicate of this bug. ***
Comment #6 in the duplicate provides additional information.
Reprodcued here.
Well, I understand the problem a bit now. In decl.c (lines 3229
to 3248), we have
/* If gfortran ends up here, then the len may be reducible to a
constant. Try to do that here. If it does not reduce, simply
assign len to the charlen. */
if (len && len->expr_type != EXPR_CONSTANT)
{
gfc_expr *e;
e = gfc_copy_expr (len);
gfc_reduce_init_expr (e);
if (e->expr_type == EXPR_CONSTANT)
{
gfc_replace_expr (len, e);
if (mpz_cmp_si (len->value.integer, 0) < 0)
mpz_set_ui (len->value.integer, 0);
}
else
{
gfc_free_expr (e);
}
cl->length = len;
}
'gfc_reduce_init_expr (e)' is causing the symbol checkFmt,
which has not previously been seen, to be committed to the
current namespace before the symbol has been resolved. So,
checkFmt() doesn't have a proper type and gfortran cannot
set it when she finally parses the function. During the
translation, checkFmt is implicitly typed, which can be
gleaned from
0x6ce630 gfc_conv_expr(gfc_se*, gfc_expr*)
../../gcc8/gcc/fortran/trans-expr.c:7918
0x6d0967 gfc_conv_expr_val(gfc_se*, gfc_expr*) <-- from stepping in gdb
../../gcc8/gcc/fortran/trans-expr.c:7975
0x6fed87 gfc_trans_if_1
../../gcc8/gcc/fortran/trans-stmt.c:1427
0x70715a gfc_trans_if(gfc_code*)
What needs to be done is that symbols in the gfc_current_ns
must be save before the call to 'gfc_reduce_init_expr (e)'.
If reduction fails, then the old symbols need to be
restored in the gfc_current_ns and any new symbols added
by 'gfc_reduce_init_expr (e)' need to be removed.
Unfortunately, I don't know how to do this.
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>From gcc-bugs-return-602939-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 07:37:41 2018
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From: "uros at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/84431] Suboptimal code for masked shifts (x86/x86-64)
Date: Sat, 28 Apr 2018 07:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84431
--- Comment #7 from uros at gcc dot gnu.org ---
Author: uros
Date: Sat Apr 28 07:37:04 2018
New Revision: 259739
URL: https://gcc.gnu.org/viewcvs?rev=259739&root=gcc&view=rev
Log:
PR target/84431
* config/i386/i386.md (*ashl<dwi>3_doubleword_mask): New pattern.
(*ashl<dwi>3_doubleword_mask_1): Ditto.
(*<shift_insn><dwi>3_doubleword_mask): Ditto.
(*<shift_insn><dwi>3_doubleword_mask_1): Ditto.
testsuite/ChangeLog:
PR target/84431
* gcc.target/i386/pr84431.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr84431.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.md
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-602940-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 07:39:56 2018
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Subject: [Bug target/84431] Suboptimal code for masked shifts (x86/x86-64)
Date: Sat, 28 Apr 2018 07:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84431
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #8 from Uroš Bizjak <ubizjak at gmail dot com> ---
Fixed.
>From gcc-bugs-return-602941-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 07:41:48 2018
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From: "tobias.bruell at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85555] New: Use of concepts gives access to private members.
Date: Sat, 28 Apr 2018 07:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85555
Bug ID: 85555
Summary: Use of concepts gives access to private members.
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: tobias.bruell at gmail dot com
Target Milestone: ---
Created attachment 44033
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44033&action=edit
Reproducer
In the following condensed example the unrelated use of concepts seems to be
giving access to the private non-static member functions of a class.
Compile with:
g++-7.3 -std=c++17 -fconcepts gcc_bug.cpp
----------------------------------------------------------------
/*
* Uncommenting the following line and commenting the line after that
* makes the program fail to compile (as it should).
*/
//template<typename Target>
template<typename Target, typename... Ts>
concept bool has_resize ()
{
return requires (Target tgt)
{
{ tgt.resize () };
};
};
template<typename Target>
void resize (Target tgt)
{
if constexpr (has_resize<Target> ())
{
tgt.resize ();
}
}
class MyClass
{
private:
int foo (int i)
{
return i * 2;
}
};
int main ()
{
return MyClass {}.foo (7);
}
>From gcc-bugs-return-602942-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 07:59:53 2018
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Subject: [Bug c++/85555] Use of concepts gives access to private members.
Date: Sat, 28 Apr 2018 07:59:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-28
Ever confirmed|0 |1
>From gcc-bugs-return-602943-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 09:29:25 2018
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From: "randy.brecker64 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/82658] Suboptimal codegen on AVR when right-shifting 8-bit unsigned integers.
Date: Sat, 28 Apr 2018 09:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82658
--- Comment #5 from Randy Brecker <randy.brecker64 at gmail dot com> ---
I confirm this is still true for x86 (!) with gcc-7.3.1 and gcc-8.0.1 in
language-mode c++.
>From gcc-bugs-return-602944-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 09:35:41 2018
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From: "randy.brecker64 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85533] Missing optimization for right-shift of unsigned int (avr-g++)
Date: Sat, 28 Apr 2018 09:35:00 -0000
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Randy Brecker <randy.brecker64 at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|avr |x86 avr
Status|RESOLVED |VERIFIED
Version|7.3.0 |8.0.1
--- Comment #3 from Randy Brecker <randy.brecker64 at gmail dot com> ---
This is also true von x86_64, where we get:
movzbl x(%rip), %eax
sarl %eax
movb %al, x(%rip)
movzbl y(%rip), %eax
shrb %al
movb %al, y(%rip)
xorl %eax, %eax
Looks like a FE bug here.
>From gcc-bugs-return-602945-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 10:00:55 2018
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From: "doko at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/85556] New: attribute no_sanitize does not accept multiple options as documented
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85556
Bug ID: 85556
Summary: attribute no_sanitize does not accept multiple options
as documented
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: doko 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: ---
[forwarded from https://bugs.debian.org/891489]
In
https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-no_005fsanitize-function-attribute
gcc 8.0.1 claims to add a no_sanitize attribute which works the same as
the clang one does.
In practice however it doesn't, and it currently will only accept a
single option. The example given above is:
$ cat nosan.c
void __attribute__ ((no_sanitize ("alignment", "object-size")))
f () { /* Do something. */; }
int main(void) { return 0; }
Which results in:
$ gcc-8 nosan.c
nosan.c:3:1: error: wrong number of arguments specified for ‘no_sanitize’
attribute
f () { /* Do something. */; }
^
It would be really nice if that did work as documented, to avoid having
to special case this in user code even more than we already do.
>From gcc-bugs-return-602946-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 10:07:23 2018
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From: "ixsci at yandex dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85557] New: Incorrect calculation of function arguments with C++17 sequencing rules
Date: Sat, 28 Apr 2018 10:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85557
Bug ID: 85557
Summary: Incorrect calculation of function arguments with C++17
sequencing rules
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ixsci at yandex dot ru
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Given the following simple code:
#include <iostream>
using namespace std;
int foo(int first, int second)
{
return first << second;
}
int main()
{
int i = 0;
cout << "Result: " << foo(i = 1, i = 2) << "\n";
};
The latest GCC (9.0 tested on Wandbox) with -std=c++17 produces the following
output: "Result: 2" but it should produce "Result: 4" because function
parameters calculations are indeterminately sequenced between each other.
>From gcc-bugs-return-602947-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 10:42:55 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85558] New: ICE in make_rtl_for_nonlocal_decl when using static member of template class
Date: Sat, 28 Apr 2018 10:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85558
Bug ID: 85558
Summary: ICE in make_rtl_for_nonlocal_decl when using static
member of template class
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: xaizek at posteo dot net
Target Milestone: ---
Source code to reproduce the ICE
================================
// no ICE if triggerBug is not a template
template <typename T>
struct triggerBug {
// no ICE if order of these two lines is swapped
friend void doInitUser(bool = triggerBug::doInit);
static bool doInit;
};
template <class T>
bool triggerBug<T>::doInit = true;
triggerBug<int> bug;
Command line and error message
==============================
$ g++-trunk gcc-bug.cpp -c -o /dev/null
gcc-bug.cpp: In instantiation of ‘struct triggerBug<int>’:
gcc-bug.cpp:12:17: required from here
gcc-bug.cpp:10:6: internal compiler error: in make_rtl_for_nonlocal_decl, at
cp/decl.c:6587
bool triggerBug<T>::doInit = true;
^~~~~~~~~~~~~
0x702c4a make_rtl_for_nonlocal_decl
../../gcc/cp/decl.c:6585
0x73211c cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
../../gcc/cp/decl.c:7243
0x8638f0 instantiate_class_template_1
../../gcc/cp/pt.c:11174
0x8638f0 instantiate_class_template(tree_node*)
../../gcc/cp/pt.c:11398
0x8be552 complete_type(tree_node*)
../../gcc/cp/typeck.c:136
0x7071e7 start_decl_1(tree_node*, bool)
../../gcc/cp/decl.c:5278
0x72ce17 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
../../gcc/cp/decl.c:5241
0x7ed93f cp_parser_init_declarator
../../gcc/cp/parser.c:19620
0x7ef8d9 cp_parser_simple_declaration
../../gcc/cp/parser.c:13063
0x7f07d8 cp_parser_block_declaration
../../gcc/cp/parser.c:12875
0x7fc394 cp_parser_declaration
../../gcc/cp/parser.c:12772
0x7fad96 cp_parser_declaration_seq_opt
../../gcc/cp/parser.c:12648
0x7fb0a3 cp_parser_translation_unit
../../gcc/cp/parser.c:4563
0x7fb0a3 c_parse_file()
../../gcc/cp/parser.c:39045
0x943bc5 c_common_parse_file()
../../gcc/c-family/c-opts.c:1132
Compiler version
================
Same results locally on 5.5.0, 7.3.0, trunk (git:
2e7e8f549a4c4c5885e4f7f5a4271f3610b54c3a, svn: 259739), and looks like any
version since 4.4 on compiler explorer (4.1 says `incomplete type
'triggerBug<int>' used in nested name specifier`). So I'm not providing
compiler flags or system details as this probably affects pretty much anything
in use today.
>From gcc-bugs-return-602948-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 12:07:56 2018
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Subject: [Bug fortran/25829] [F03] Asynchronous IO support
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25829
Nicolas Koenig <koenigni at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #43877|0 |1
is obsolete| |
--- Comment #35 from Nicolas Koenig <koenigni at gcc dot gnu.org> ---
Created attachment 44034
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44034&action=edit
Concept patch (works with read and simple wait for integers)
>From gcc-bugs-return-602949-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 12:25:28 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 middle-end/85559] New: [meta-bug] Improve conditional move
Date: Sat, 28 Apr 2018 12:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85559
Bug ID: 85559
Summary: [meta-bug] Improve conditional move
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: meta-bug
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Depends on: 22568, 29144, 46279, 56309, 65492, 78947, 80520,
80874, 81456, 82666, 82858, 83610, 85390
Target Milestone: ---
Target: x86_64-*-*, i?86-*-*
cmov generation should be improved.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22568
[Bug 22568] Should use cmov in some stituations
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=29144
[Bug 29144] Missing if-conversion. If-conversion dependent on operand order.
Inconsistent if-conversion.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46279
[Bug 46279] cmov not hoisted out of the loop
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56309
[Bug 56309] conditional moves instead of compare and branch result in almost 2x
slower code
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65492
[Bug 65492] Bad optimization in -O3 due to if-conversion and/or unrolling
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78947
[Bug 78947] sub-optimal code for (bool)(int ? int : int)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80520
[Bug 80520] [7/8/9 Regression] Performance regression from missing
if-conversion
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80874
[Bug 80874] gcc does not emit cmov for minmax
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81456
[Bug 81456] [7/8/9 Regression] x86-64 optimizer makes wrong decision when
optimizing for size
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82666
[Bug 82666] [7/8/9 regression]: sum += (x>128/9 ? x : 0) puts the cmov on the
critical path (at -O2)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82858
[Bug 82858] __builtin_add_overflow() generates suboptimal code with unsigned
types on x86
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83610
[Bug 83610] __builtin_expect sometimes is ignored
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85390
[Bug 85390] possible missed optimisation / regression from 6.3 with conditional
expression
>From gcc-bugs-return-602950-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 12:36:39 2018
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Subject: [Bug fortran/25829] [F03] Asynchronous IO support
Date: Sat, 28 Apr 2018 12:36:00 -0000
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--- Comment #36 from Nicolas Koenig <koenigni at gcc dot gnu.org> ---
There seems to be a mismatch between the front end and the library.
For
program main
integer :: id
character(len=50) :: iomsg
integer :: iostat
id = 0
open(10,file="wait.dat",iostat=iostat,iomsg=iomsg, asynchronous="yes")
wait (10,id=id)
end program main
the front end generates
struct __st_parameter_wait wait_parm.1;
wait_parm.1.common.filename = &"wait.f90"[1]{lb: 1 sz: 1};
wait_parm.1.common.line = 7;
wait_parm.1.id = (integer(kind=4) *) (integer(kind=8)) id;
wait_parm.1.common.flags = 128;
wait_parm.1.common.unit = 10;
_gfortran_st_wait (&wait_parm.1);
where the type conversions are strange. The library then receives
(gdb) p *wtp
$1 = {common = {flags = 128, unit = 10, filename = 0x428d70 "wait.f90", line =
7, iomsg_len = 50, iomsg = 0x7fffffffdc90 "\377\377\377\377",
iostat = 0x7fffffffdc8c}, id = 0x0, id_len = 8}
so some adjustment of
typedef struct
{
st_parameter_common common;
CHARACTER1 (id);
}
st_parameter_wait;
is probably required.
>From gcc-bugs-return-602951-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 12:45:48 2018
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From: "aurelien at aurel32 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85492] riscv64: endless loop when throwing an exception from a constructor
Date: Sat, 28 Apr 2018 12:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85492
--- Comment #7 from Aurelien Jarno <aurelien at aurel32 dot net> ---
(In reply to Jim Wilson from comment #3)
Thanks a lot Jim for finding out the issue without using gdb, that was quite a
challenge.
(In reply to Jim Wilson from comment #6)
> I suggest you handle the glibc patch.
Should I just close this bug and open a new one on the glibc side?
> Note that you can probably also fix this by adding unwind direcives to
> _start to say that the return address is in x0. This would avoid the minor
> code size increase, but takes a little more effort to figure out how to add
> the right unwind directives to assembly code to make this work. I haven't
> tried that.
I think this should be done with the cfi_undefined directive, like in the patch
below:
--- a/sysdeps/riscv/start.S
+++ b/sysdeps/riscv/start.S
@@ -43,6 +43,8 @@
__libc_start_main wants this in a5. */
ENTRY (ENTRY_POINT)
+ /* Mark ra as undefined in order to stop unwinding here! */
+ cfi_undefined (ra)
call .Lload_gp
mv a5, a0 /* rtld_fini. */
/* main may be in a shared library. */
>From gcc-bugs-return-602952-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 14:16:17 2018
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Subject: [Bug rtl-optimization/85560] New: Missed optimization in bit-by-bit variable zeroing
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85560
Bug ID: 85560
Summary: Missed optimization in bit-by-bit variable zeroing
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: vlad at ivanov dot email
Target Milestone: ---
The following C++ code loops until a variable is cleared bit-by-bit:
#include <cstdint>
uint32_t b;
uint32_t test() {
uint32_t a = b;
uint32_t bits = 1;
while (a != 0) {
a &= ~bits;
bits <<= 1;
}
return 0;
}
After looping, it returns 0. While the loop is useless, it still exists in the
assembly even with -O3.
GCC version: 9.0.0 20180427
Demo: https://godbolt.org/g/7gRMqu
Notably, the loop is optimized away on ICC 18
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Subject: [Bug fortran/25829] [F03] Asynchronous IO support
Date: Sat, 28 Apr 2018 14:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25829
--- Comment #37 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
(In reply to Nicolas Koenig from comment #36)
> so some adjustment of
>
> typedef struct
> {
> st_parameter_common common;
> CHARACTER1 (id);
> }
> st_parameter_wait;
>
> is probably required.
If id is not a string, so should be:
typedef struct
{
st_parameter_common common;
GFC_IO_INT id;
}
st_parameter_wait;
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85492] riscv64: endless loop when throwing an exception from a constructor
Date: Sat, 28 Apr 2018 14:48:00 -0000
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--- Comment #8 from Jim Wilson <wilson at gcc dot gnu.org> ---
(In reply to Aurelien Jarno from comment #7)
> Should I just close this bug and open a new one on the glibc side?
That is fine if you want to do that.
> + /* Mark ra as undefined in order to stop unwinding here! */
> + cfi_undefined (ra)
I tried this, and it worked for me.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/25829] [F03] Asynchronous IO support
Date: Sat, 28 Apr 2018 14:52:00 -0000
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--- Comment #38 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
(In reply to Jerry DeLisle from comment #37)
> (In reply to Nicolas Koenig from comment #36)
> > so some adjustment of
> >
> > typedef struct
> > {
> > st_parameter_common common;
> > CHARACTER1 (id);
> > }
> > st_parameter_wait;
> >
> > is probably required.
>
> If id is not a string, so should be:
>
> typedef struct
> {
> st_parameter_common common;
> GFC_IO_INT id;
> }
> st_parameter_wait;
The funky cast of int 8 to an integer 4 in the front end is odd. I wonder if it
is related to patches to try to get -fdefault-integer-8 to work. It looks
horrible.
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Subject: [Bug fortran/81773] [Coarray] Get with vector index on lhs leads to incorrect caf_get_by_ref() call.
Date: Sat, 28 Apr 2018 14:54:00 -0000
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--- Comment #7 from vehre at gcc dot gnu.org ---
Author: vehre
Date: Sat Apr 28 14:54:09 2018
New Revision: 259741
URL: https://gcc.gnu.org/viewcvs?rev=259741&root=gcc&view=rev
Log:
gcc/fortran/ChangeLog:
2018-04-28 Andre Vehreschild <vehre@gcc.gnu.org>
PR fortran/81773
PR fortran/83606
Backport from trunk
* dependency.c (gfc_dep_resolver): Coarray indexes are to be ignored
during dependency computation. They define no data dependency.
* trans-array.c (conv_array_index_offset): The stride can not be set
here, prevent fail.
* trans-intrinsic.c (conv_caf_send): Add creation of temporary array
for caf_get's result and copying to the array with vectorial
indexing.
gcc/testsuite/ChangeLog:
2018-04-28 Andre Vehreschild <vehre@gcc.gnu.org>
PR fortran/81773
PR fortran/83606
Backport from trunk
* gfortran.dg/coarray/get_to_indexed_array_1.f90: New test.
* gfortran.dg/coarray/get_to_indirect_array.f90: New test.
Added:
branches/gcc-6-branch/gcc/testsuite/gfortran.dg/coarray/get_to_indexed_array_1.f90
branches/gcc-6-branch/gcc/testsuite/gfortran.dg/coarray/get_to_indirect_array.f90
Modified:
branches/gcc-6-branch/gcc/fortran/ChangeLog
branches/gcc-6-branch/gcc/fortran/dependency.c
branches/gcc-6-branch/gcc/fortran/trans-array.c
branches/gcc-6-branch/gcc/fortran/trans-intrinsic.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/83606] [6/7/8 Regression] co-indexed array RHS yields incorrect result in assignment to vector-indexed LHS
Date: Sat, 28 Apr 2018 14:55:00 -0000
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--- Comment #9 from vehre at gcc dot gnu.org ---
Author: vehre
Date: Sat Apr 28 14:54:20 2018
New Revision: 259742
URL: https://gcc.gnu.org/viewcvs?rev=259742&root=gcc&view=rev
Log:
gcc/fortran/ChangeLog:
2018-04-28 Andre Vehreschild <vehre@gcc.gnu.org>
PR fortran/81773
PR fortran/83606
Backport from trunk
* dependency.c (gfc_dep_resolver): Coarray indexes are to be ignored
during dependency computation. They define no data dependency.
* trans-array.c (conv_array_index_offset): The stride can not be set
here, prevent fail.
* trans-intrinsic.c (conv_caf_send): Add creation of temporary array
for caf_get's result and copying to the array with vectorial
indexing.
gcc/testsuite/ChangeLog:
2018-04-28 Andre Vehreschild <vehre@gcc.gnu.org>
PR fortran/81773
PR fortran/83606
Backport from trunk
* gfortran.dg/coarray/get_to_indexed_array_1.f90: New test.
* gfortran.dg/coarray/get_to_indirect_array.f90: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/coarray/get_to_indexed_array_1.f90
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/coarray/get_to_indirect_array.f90
Modified:
branches/gcc-7-branch/gcc/fortran/ChangeLog
branches/gcc-7-branch/gcc/fortran/dependency.c
branches/gcc-7-branch/gcc/fortran/trans-array.c
branches/gcc-7-branch/gcc/fortran/trans-intrinsic.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/83606] [6/7/8 Regression] co-indexed array RHS yields incorrect result in assignment to vector-indexed LHS
Date: Sat, 28 Apr 2018 14:55:00 -0000
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--- Comment #8 from vehre at gcc dot gnu.org ---
Author: vehre
Date: Sat Apr 28 14:54:09 2018
New Revision: 259741
URL: https://gcc.gnu.org/viewcvs?rev=259741&root=gcc&view=rev
Log:
gcc/fortran/ChangeLog:
2018-04-28 Andre Vehreschild <vehre@gcc.gnu.org>
PR fortran/81773
PR fortran/83606
Backport from trunk
* dependency.c (gfc_dep_resolver): Coarray indexes are to be ignored
during dependency computation. They define no data dependency.
* trans-array.c (conv_array_index_offset): The stride can not be set
here, prevent fail.
* trans-intrinsic.c (conv_caf_send): Add creation of temporary array
for caf_get's result and copying to the array with vectorial
indexing.
gcc/testsuite/ChangeLog:
2018-04-28 Andre Vehreschild <vehre@gcc.gnu.org>
PR fortran/81773
PR fortran/83606
Backport from trunk
* gfortran.dg/coarray/get_to_indexed_array_1.f90: New test.
* gfortran.dg/coarray/get_to_indirect_array.f90: New test.
Added:
branches/gcc-6-branch/gcc/testsuite/gfortran.dg/coarray/get_to_indexed_array_1.f90
branches/gcc-6-branch/gcc/testsuite/gfortran.dg/coarray/get_to_indirect_array.f90
Modified:
branches/gcc-6-branch/gcc/fortran/ChangeLog
branches/gcc-6-branch/gcc/fortran/dependency.c
branches/gcc-6-branch/gcc/fortran/trans-array.c
branches/gcc-6-branch/gcc/fortran/trans-intrinsic.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/81773] [Coarray] Get with vector index on lhs leads to incorrect caf_get_by_ref() call.
Date: Sat, 28 Apr 2018 14:55:00 -0000
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--- Comment #8 from vehre at gcc dot gnu.org ---
Author: vehre
Date: Sat Apr 28 14:54:20 2018
New Revision: 259742
URL: https://gcc.gnu.org/viewcvs?rev=259742&root=gcc&view=rev
Log:
gcc/fortran/ChangeLog:
2018-04-28 Andre Vehreschild <vehre@gcc.gnu.org>
PR fortran/81773
PR fortran/83606
Backport from trunk
* dependency.c (gfc_dep_resolver): Coarray indexes are to be ignored
during dependency computation. They define no data dependency.
* trans-array.c (conv_array_index_offset): The stride can not be set
here, prevent fail.
* trans-intrinsic.c (conv_caf_send): Add creation of temporary array
for caf_get's result and copying to the array with vectorial
indexing.
gcc/testsuite/ChangeLog:
2018-04-28 Andre Vehreschild <vehre@gcc.gnu.org>
PR fortran/81773
PR fortran/83606
Backport from trunk
* gfortran.dg/coarray/get_to_indexed_array_1.f90: New test.
* gfortran.dg/coarray/get_to_indirect_array.f90: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/coarray/get_to_indexed_array_1.f90
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/coarray/get_to_indirect_array.f90
Modified:
branches/gcc-7-branch/gcc/fortran/ChangeLog
branches/gcc-7-branch/gcc/fortran/dependency.c
branches/gcc-7-branch/gcc/fortran/trans-array.c
branches/gcc-7-branch/gcc/fortran/trans-intrinsic.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
>From gcc-bugs-return-602960-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 14:56:31 2018
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From: "Casey at Carter dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85555] Use of concepts gives access to private members.
Date: Sat, 28 Apr 2018 14:56:00 -0000
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Casey Carter <Casey at Carter dot net> changed:
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CC| |Casey at Carter dot net
--- Comment #1 from Casey Carter <Casey at Carter dot net> ---
Duplicate of 67225 and/or 78715.
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From: "jvdelisle at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/25829] [F03] Asynchronous IO support
Date: Sat, 28 Apr 2018 15:06:00 -0000
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--- Comment #39 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Per definition in ioparm.def in frontend:
IOPARM (wait, id, 1 << 7, pint4)
id should be a pointer to an integer kind=4.
This means:
> typedef struct
> {
> st_parameter_common common;
> GFC_IO_INT id;
> }
> st_parameter_wait;
should be:
typedef struct
{
st_parameter_common common;
GFC_INTEGER_4 *id;
}
st_parameter_wait;
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From: "aurelien at aurel32 dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85492] riscv64: endless loop when throwing an exception from a constructor
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Aurelien Jarno <aurelien at aurel32 dot net> changed:
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--- Comment #9 from Aurelien Jarno <aurelien at aurel32 dot net> ---
(In reply to Jim Wilson from comment #8)
> (In reply to Aurelien Jarno from comment #7)
> > Should I just close this bug and open a new one on the glibc side?
>
> That is fine if you want to do that.
As this actually a GNU libc bug, I have opened the following bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=23125
>From gcc-bugs-return-602963-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 16:23:23 2018
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85561] New: [9.0 regression] ICE in in gfc_dep_resolver when compiling OpenCoarrays
Date: Sat, 28 Apr 2018 16:23:00 -0000
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Bug ID: 85561
Summary: [9.0 regression] ICE in in gfc_dep_resolver when
compiling OpenCoarrays
Product: gcc
Version: 9.0
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When compiling OpenCoarrays 2.0.0 I get the following ICE:
cd
/usr/local/packages/OpenCoarrays-2.0.0/_build/src/tests/integration/dist_transpose
&& ../../../../bin/caf -I /usr/local/include -DPREFIX_NAME=_gfortran_caf_
-DGCC_GE_7 -DGCC_GE_8 -DHAVE_MPI -O3 -DNDEBUG -O3 -o
/usr/local/packages/OpenCoarrays-2.0.0/_build/bin/OpenCoarrays-2.0.0-tests/coarray_distributed_transpose
/usr/local/packages/OpenCoarrays-2.0.0/src/tests/integration/dist_transpose/coarray_distributed_transpose.F90
/usr/local/packages/OpenCoarrays-2.0.0/src/tests/integration/dist_transpose/coarray_distributed_transpose.F90:57:0:
do i = 2, num_nodes; variable[i] = variable; end do
internal compiler error: in gfc_dep_resolver, at fortran/dependency.c:2258
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
Using the official version OpenCoarrays 2.0.0 with the actual 9.0 trunk
r259698. I recently compiled it with 8.0.1 r258195 and it was still working.
>From gcc-bugs-return-602964-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 16:24:48 2018
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85561] [9.0 regression] ICE in in gfc_dep_resolver when compiling OpenCoarrays
Date: Sat, 28 Apr 2018 16:24:00 -0000
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--- Comment #1 from Jürgen Reuter <juergen.reuter at desy dot de> ---
I just started playing around with OpenCoarrays. Not sure whether I should also
report this to the OpenCoarrays team.
>From gcc-bugs-return-602965-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 16:31:06 2018
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85561] [9.0 regression] ICE in in gfc_dep_resolver when compiling OpenCoarrays
Date: Sat, 28 Apr 2018 16:30:00 -0000
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--- Comment #2 from Jürgen Reuter <juergen.reuter at desy dot de> ---
One more addition: I was using mpich-3.2, which compiled without error and also
fulfilled its complete test suite.
>From gcc-bugs-return-602966-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 16:32:21 2018
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85561] [9.0 regression] ICE in in gfc_dep_resolver when compiling OpenCoarrays
Date: Sat, 28 Apr 2018 16:32:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-04-28
Ever confirmed|0 |1
--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Likely a duplicate of pr85507.
>From gcc-bugs-return-602967-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 16:47:03 2018
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85507] [8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
Date: Sat, 28 Apr 2018 16:47:00 -0000
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--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> The change occurred between revisions r259378 (2018-04-13, OK) and r259540
> (2018-04-21), likely r259385.
The ICE is gone if I revert the change in dependency.c from r259385.
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Subject: [Bug fortran/85561] [9.0 regression] ICE in in gfc_dep_resolver when compiling OpenCoarrays
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
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Resolution|--- |DUPLICATE
--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
As for pr85507 the ICE is gone if I revert the change in dependency.c from
r259385. Marking as duplicate.
*** This bug has been marked as a duplicate of bug 85507 ***
>From gcc-bugs-return-602968-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 18:00:58 2018
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85507] [8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
Date: Sat, 28 Apr 2018 18:00:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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CC| |juergen.reuter at desy dot de
--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
*** Bug 85561 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-602970-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 18:20:13 2018
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From: "lucier at math dot purdue.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84829] -mieee-fp causes to link with -lieee but that is no longer available
Date: Sat, 28 Apr 2018 18:20:00 -0000
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--- Comment #13 from lucier at math dot purdue.edu ---
Is the solution then to remove the -mieee-fp and -mno-ieee-fp options
(especially from the manual) so that credulous users like me don't suffer from
this problem? (I just got a bug report for the Gambit Scheme system because of
this.)
>From gcc-bugs-return-602971-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 19:04:12 2018
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From: "eggert at cs dot ucla.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85562] New: -Wsuggest-attribute=malloc misleads about "returning normally"
Date: Sat, 28 Apr 2018 19:04:00 -0000
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Bug ID: 85562
Summary: -Wsuggest-attribute=malloc misleads about "returning
normally"
Product: gcc
Version: 8.0.1
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I ran into this problem when compiling Emacs with gcc (GCC) 8.0.1 20180324 (Red
Hat 8.0.1-0.20) x86-64. When I use this command:
gcc -S -O2 -Wsuggest-attribute=malloc sample.c
to compile the following program:
#include <stdlib.h>
void *
xmalloc (size_t n)
{
if (n == 0)
abort ();
return malloc (n);
}
the output is:
sample.c: In function ‘xmalloc’:
sample.c:4:1: warning: function might be candidate for attribute ‘malloc’ if it
is known to return normally [-Wsuggest-attribute=malloc]
xmalloc (size_t n)
^~~~~~~
The phrase "if it is known to return normally" is misleading and should be
removed from the diagnostic. Although the phrase is borrowed from similar
diagnostics for pure functions where the phrase is relevant (see GCC bug
51971), whether a function is known to return normally is irrelevant to how the
compiler should optimize the malloc attribute. The GCC manual does not state
that the malloc attribute should be applied only to functions that return
normally, and GCC's diagnostics should not imply otherwise.
>From gcc-bugs-return-602972-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 20:02:46 2018
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Subject: [Bug c/85563] New: -Wmaybe-uninitialized false alarm regression with __builtin_unreachable and GCC 8
Date: Sat, 28 Apr 2018 20:02:00 -0000
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Bug ID: 85563
Summary: -Wmaybe-uninitialized false alarm regression with
__builtin_unreachable and GCC 8
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
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Priority: P3
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When compiling Emacs with gcc (GCC) 8.0.1 20180324 (Red Hat 8.0.1-0.20) x86-64
I noticed a regression compared to previous GCC versions, a regression that
causes a false alarm. Briefly, Emacs uses a statement like this:
((CONSP (Vframe_list)) ? (void) 0 : __builtin_unreachable ());
to tell Emacs that Vframe_list is a cons (CONSP is inline and side effect
free), and then follows this with a loop:
for ((tail) = Vframe_list;
(CONSP (tail) && (frame1 = XCAR (tail), 1));
tail = XCDR (tail))
{ loop body }
which obviously must initialize frame1. In a later use of frame1, though, GCC
8.0.1 incorrectly complains:
f.i: In function ‘delete_frame’:
f.i:69688:7: warning: ‘frame1’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
do_switch_frame (frame1, 0, 1, builtin_lisp_symbol (0));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
where GCC 7 and earlier do not complain. To reproduce the problem, use the
command:
gcc -O2 -S -Wmaybe-uninitialized f.i
on the attached file f.i. Although strictly speaking this isn't a bug since the
"may be used uninitialized" is deliberately wishy-washy, still, it's an
annoyance that I'll have to fiddle with Emacs source to pacify the misguided
compiler here.
>From gcc-bugs-return-602973-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 28 20:09:25 2018
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Subject: [Bug c/85563] -Wmaybe-uninitialized false alarm regression with __builtin_unreachable and GCC 8
Date: Sat, 28 Apr 2018 20:09:00 -0000
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--- Comment #1 from eggert at cs dot ucla.edu ---
Created attachment 44035
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44035&action=edit
sample program illustrating regression
I've gzipped f.i as it is rather large.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/79929] [7 Regression] Bogus Warning: '__builtin_memset': specified size 4294967291 exceeds maximum object size 2147483647
Date: Sat, 28 Apr 2018 23:22:00 -0000
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andysem at mail dot ru changed:
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CC| |andysem at mail dot ru
--- Comment #33 from andysem at mail dot ru ---
The r256284 seems to fix the warning for Fortran and I'm seeing the warning in
C/C++ on gcc 7.2. Is the C/C++ compiler also fixed?
>From gcc-bugs-return-602975-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 03:42:36 2018
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From: "alinshans at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85564] New: Option "-static" affects the type of generated program
Date: Sun, 29 Apr 2018 03:42:00 -0000
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Bug ID: 85564
Summary: Option "-static" affects the type of generated program
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
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System: Ubuntu 16.04
GCC version: 7.3.0
For example:
// main.c
int main() { return 0; }
Runs the following commands:
$ gcc main.c -fPIC -pie -nostdlib -emain -static
$ readelf -h a.out
In the "TYPE" field, GCC 7.3 is "DYN" while GCC 7.1/7.2 is "EXEC". After
removing the option "-static", all of them are "DYN". Does the option "-static"
affect the type of generated program?
>From gcc-bugs-return-602976-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 04:12:59 2018
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Subject: [Bug fortran/85566] New: LEN() intrinsic returns zero when given zero-sized array
Date: Sun, 29 Apr 2018 04:12:00 -0000
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Bug ID: 85566
Summary: LEN() intrinsic returns zero when given zero-sized
array
Product: gcc
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Target Milestone: ---
The following code returns "10,0" instead of "10,20"
program test_len
character(len=:), allocatable :: arr(:)
arr=[ character(len=10)::'A','B']
write(*,*)len(arr) ! gets "10", which is what I expect
arr=[ character(len=20)::]
write(*,*)len(arr) ! gets "0", but I think it should get "20"
end program test_len
That is, when passed a zero-length array the LEN(3f) intrinsic appears to
always report a value of zero(0). Even if the array is of zero size it still
has a length defined for the elments, and I believe it should return that,
not zero.
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Subject: [Bug fortran/85565] New: LEN() intrinsic returns zero when given zero-sized array
Date: Sun, 29 Apr 2018 04:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85565
Bug ID: 85565
Summary: LEN() intrinsic returns zero when given zero-sized
array
Product: gcc
Version: 6.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
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The following code returns "10,0" instead of "10,20"
program test_len
character(len=:), allocatable :: arr(:)
arr=[ character(len=10)::'A','B']
write(*,*)len(arr) ! gets "10", which is what I expect
arr=[ character(len=20)::]
write(*,*)len(arr) ! gets "0", but I think it should get "20"
end program test_len
That is, when passed a zero-length array the LEN(3f) intrinsic appears to
always report a value of zero(0). Even if the array is of zero size it still
has a length defined for the elments, and I believe it should return that,
not zero.
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Subject: [Bug c/85567] New: internal compiler error: in gimplify_modify_expr, at gimplify.c:5797 when using sincos()
Date: Sun, 29 Apr 2018 08:43:00 -0000
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Bug ID: 85567
Summary: internal compiler error: in gimplify_modify_expr, at
gimplify.c:5797 when using sincos()
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
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Created attachment 44036
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44036&action=edit
preprocessed file
Compiler fails with an internal compiler error in gimplify_modify_expr when
using the builtin sincos() function.
Error is reproducible with gcc 8.0.1, 7.3.0 and 7.2.0 with -O2 optimization,
but is not triggered with reduced optimization (-O1) or applying std flags,
e.g. -std=c18.
Example is stripped down to the bare minimum still triggering the compiler
error.
# command line
gcc -c -O2 bug.c
# compiler output with gcc version 8.0.1 20180414 (experimental) [trunk
revision 259383] (Debian 8-20180414-1)
during GIMPLE pass: einline
bug.c: In function ‘apply_sincos’:
bug.c:11:2: internal compiler error: in gimplify_modify_expr, at
gimplify.c:5797
f(x, sinx, cosx);
^~~~~~~~~~~~~~~~
0x5858ef gimplify_modify_expr
../../src/gcc/gimplify.c:5796
0x81fc29 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
../../src/gcc/gimplify.c:11434
0x8223f6 gimplify_stmt(tree_node**, gimple**)
../../src/gcc/gimplify.c:6658
0x824128 gimplify_and_add(tree_node*, gimple**)
../../src/gcc/gimplify.c:441
0x824128 internal_get_tmp_var
../../src/gcc/gimplify.c:597
0x82153c get_initialized_tmp_var(tree_node*, gimple**, gimple**, bool)
../../src/gcc/gimplify.c:628
0x82153c gimplify_save_expr
../../src/gcc/gimplify.c:5931
0x82153c gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
../../src/gcc/gimplify.c:11734
0x81f515 gimplify_compound_lval
../../src/gcc/gimplify.c:2965
0x81f515 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
../../src/gcc/gimplify.c:11386
0x829853 gimplify_modify_expr
../../src/gcc/gimplify.c:5625
0x81fc29 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
../../src/gcc/gimplify.c:11434
0x8223f6 gimplify_stmt(tree_node**, gimple**)
../../src/gcc/gimplify.c:6658
0x822afb gimplify_compound_expr
../../src/gcc/gimplify.c:5885
0x81fc57 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
../../src/gcc/gimplify.c:11424
0x8223f6 gimplify_stmt(tree_node**, gimple**)
../../src/gcc/gimplify.c:6658
0x822442 gimplify_and_add(tree_node*, gimple**)
../../src/gcc/gimplify.c:441
0x7f6f3c gimplify_and_update_call_from_tree(gimple_stmt_iterator*, tree_node*)
../../src/gcc/gimple-fold.c:551
0x7ff4b6 gimple_fold_builtin
../../src/gcc/gimple-fold.c:3784
0x801f74 gimple_fold_call
../../src/gcc/gimple-fold.c:4150
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-8/README.Bugs> for instructions.
# compiler output with gcc version 7.3.0 (Debian 7.3.0-16)
bug.c: In function ‘apply_sincos’:
bug.c:11:2: internal compiler error: in gimplify_modify_expr, at
gimplify.c:5645
f(x, sinx, cosx);
^~~~~~~~~~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.
# gcc-8 -v
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='Debian 8-20180414-1'
--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] (Debian
8-20180414-1)
# gcc-7 -v
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='Debian 7.3.0-16'
--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 (Debian 7.3.0-16)
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Subject: [Bug fortran/85565] LEN() intrinsic returns zero when given zero-sized array
Date: Sun, 29 Apr 2018 09:09:00 -0000
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--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
*** Bug 85566 has been marked as a duplicate of this bug. ***
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Subject: [Bug fortran/85566] LEN() intrinsic returns zero when given zero-sized array
Date: Sun, 29 Apr 2018 09:09:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Dup.
*** This bug has been marked as a duplicate of bug 85565 ***
>From gcc-bugs-return-602981-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 09:16:12 2018
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Subject: [Bug fortran/85565] LEN() intrinsic returns zero when given a zero-sized constructor
Date: Sun, 29 Apr 2018 09:15:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-29
Summary|LEN() intrinsic returns |LEN() intrinsic returns
|zero when given zero-sized |zero when given a
|array |zero-sized constructor
Ever confirmed|0 |1
--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Confirmed from at least 4.8 up to trunk (9.0).
Note that
character(len=20) :: empty(0)
character(len=20, kind=4) :: empty4(0)
print *, len(empty), size(empty)
print *, len(empty4), size(empty4)
gives
20 0
20 0
i.e., the problem occurs only with empty constructors.
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Subject: [Bug fortran/85507] [8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
Date: Sun, 29 Apr 2018 10:08:00 -0000
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--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> The ICE is gone if I revert the change in dependency.c from r259385.
This regtests cleanly.
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug testsuite/85527] [openacc] atomic_capture-1.{c,f90} undefined behaviour
Date: Sun, 29 Apr 2018 10:27:00 -0000
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--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Sun Apr 29 10:26:56 2018
New Revision: 259748
URL: https://gcc.gnu.org/viewcvs?rev=259748&root=gcc&view=rev
Log:
[openacc, testsuite] Fix undefined behaviour in atomic_capture-1.c
2018-04-29 Julian Brown <julian@codesourcery.com>
Tom de Vries <tom@codesourcery.com>
PR testsuite/85527
* testsuite/libgomp.oacc-c-c++-common/atomic_capture-1.c: Allow
arbitrary order for iterations of atomic subtract check.
Modified:
trunk/libgomp/ChangeLog
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/atomic_capture-1.c
>From gcc-bugs-return-602984-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 10:43:56 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 go/85429] Several gotools tests FAIL with Solaris as
Date: Sun, 29 Apr 2018 10:43:00 -0000
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--- Comment #6 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #4 from Ian Lance Taylor <ian at airs dot com> ---
> Should be fixed on tip, requested permission to backport to GCC 8 branch.
It's fixed on sparc, but the Solaris/x86 with as failures remain
(although shifting to a different reason):
# cmd/go/internal/str
Assembler:
"/var/tmp//cc.Q_kMa.s", line 1 : Syntax error
Near line: " .section ".go.buildid",#exclude"
Unlike sparc, there must be no quotes around the section name.
However, that form
.section .go.buildid,#exclude
makes gas 2.30 choke on x86:
$ gas-2.30 --32 excl.s -o excl.o
excl.s: Assembler messages:
excl.s:1: Error: character following name is not '#'
while it works just fine on sparc.
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Subject: [Bug testsuite/85527] [openacc] atomic_capture-1.{c,f90} undefined behaviour
Date: Sun, 29 Apr 2018 10:47:00 -0000
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Tom de Vries <vries at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Patches fixing each test-case committed, marking resolved-fixed.
>From gcc-bugs-return-602986-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 11:52:05 2018
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Sun, 29 Apr 2018 11:52:00 -0000
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--- Comment #40 from Andrew Haley <aph at gcc dot gnu.org> ---
(In reply to rguenther@suse.de from comment #29)
> Note I repeatedly said this part of the standard is just stupid. It makes
> most if not all type-based alias analysis useless.
I don't think so. It does mean that we'd have to feed all declared
union types (or, at least the ones containing structs with common
initial sequences) into the alias oracle. While unpleasant, in that
simply declaring a type without even declaring an object of that type
changes code generation, it doesn't render all type-based alias
analysis useless.
> Which means I'll refuse any patches implementing it in a way that affects
> default behavior.
Maybe --pedantic or even --pedantic-aliasing?
>From gcc-bugs-return-602987-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 12:37:16 2018
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Subject: [Bug fortran/85507] [8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
Date: Sun, 29 Apr 2018 12:37:00 -0000
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--- Comment #5 from vehre at gcc dot gnu.org ---
(In reply to Dominique d'Humieres from comment #4)
> > The ICE is gone if I revert the change in dependency.c from r259385.
>
> This regtests cleanly.
Well, it regtests cleanly, but produces incorrect code. The detection, that
x[2] and x reference the same variable and may require a temporary in the
assignment (at least when we are on image 2) is not assessed correctly.
>From gcc-bugs-return-602988-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 12:37:44 2018
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Subject: [Bug fortran/85507] [8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
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Subject: [Bug c++/85568] New: is_invocable(F, decltype(objs)...) fails with "not supported by dump_expr#" unless via indirection
Date: Sun, 29 Apr 2018 13:00:00 -0000
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Bug ID: 85568
Summary: is_invocable(F, decltype(objs)...) fails with "not
supported by dump_expr#" unless via indirection
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Created attachment 44037
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44037&action=edit
Source code exposing the bug
The following program compiles as C++17 with g++-7.3, but not with g++-8 built
from /branches/gcc-8-branch at revision 259748.
It does compile, however, if compilation flag -DVIA_TUPLE is added, which
expands std::is_invocable<> via an indirection.
Compilation error is:
tests.cpp: In instantiation of 'constexpr auto compose(F&&, Fs&& ...) [with F =
const equal(T&&) [with T = int]::<lambda(const auto:1&)>&; Fs =
{std::plus<void>}]':
tests.cpp:98:22: required from here
tests.cpp:86:20: error: expansion pattern 'decltype (#'nontype_argument_pack'
not supported by dump_expr#<expression error>)' contains no argument packs
constexpr auto unitail = typename std::is_invocable<tail_type,
decltype(objs)...>::type{};
^~~~~~~
tests.cpp:98:23: error: non-constant condition for static assertion
static_assert(compose(eq<3>,
~~~~~~~~~~~~~~
std::plus<>{})(1,2),
~~~~~~~~~~~~~~^~~~~
tests.cpp:98:23: error: call to non-'constexpr' function 'compose(F&&, Fs&&
...) [with F = const equal(T&&) [with T = int]::<lambda(const auto:1&)>&; Fs =
{std::plus<void>}]::<lambda(auto:2&& ...)> [with auto:2 = {int, int}; decltype
(detail::compose(typename std::is_invocable<std::plus<void>, decltype
(objs)...>::type{}, f, compose(forward<std::plus<void> >(fs#0)),
(forward<decltype(compose::__lambda1::operator()::objs)>)(compose::__lambda1::operator()::objs)...))
= bool]'
tests.cpp:75:8: note: 'compose(F&&, Fs&& ...) [with F = const equal(T&&) [with
T = int]::<lambda(const auto:1&)>&; Fs = {std::plus<void>}]::<lambda(auto:2&&
...)> [with auto:2 = {int, int}; decltype (detail::compose(typename
std::is_invocable<std::plus<void>, decltype (objs)...>::type{}, f,
compose(forward<std::plus<void> >(fs#0)),
(forward<decltype(compose::__lambda1::operator()::objs)>)(compose::__lambda1::operator()::objs)...))
= bool]' is not usable as a 'constexpr' function because:
-> decltype(detail::compose(typename
std::is_invocable<decltype(compose(std::forward<Fs>(fs)...)),
decltype(objs)...>::type{},
^~~~~~~~
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Subject: [Bug c++/85569] New: is_invocable(F, decltype(objs)...) fails with "not supported by dump_expr#" unless via indirection
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Bug ID: 85569
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Product: gcc
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The following program compiles as C++17 with g++-7.3, but not with g++-8 built
from /branches/gcc-8-branch at revision 259748.
It does compile, however, if compilation flag -DVIA_TUPLE is added, which
expands std::is_invocable<> via an indirection.
Compilation error is:
tests.cpp: In instantiation of 'constexpr auto compose(F&&, Fs&& ...) [with F =
const equal(T&&) [with T = int]::<lambda(const auto:1&)>&; Fs =
{std::plus<void>}]':
tests.cpp:98:22: required from here
tests.cpp:86:20: error: expansion pattern 'decltype (#'nontype_argument_pack'
not supported by dump_expr#<expression error>)' contains no argument packs
constexpr auto unitail = typename std::is_invocable<tail_type,
decltype(objs)...>::type{};
^~~~~~~
tests.cpp:98:23: error: non-constant condition for static assertion
static_assert(compose(eq<3>,
~~~~~~~~~~~~~~
std::plus<>{})(1,2),
~~~~~~~~~~~~~~^~~~~
tests.cpp:98:23: error: call to non-'constexpr' function 'compose(F&&, Fs&&
...) [with F = const equal(T&&) [with T = int]::<lambda(const auto:1&)>&; Fs =
{std::plus<void>}]::<lambda(auto:2&& ...)> [with auto:2 = {int, int}; decltype
(detail::compose(typename std::is_invocable<std::plus<void>, decltype
(objs)...>::type{}, f, compose(forward<std::plus<void> >(fs#0)),
(forward<decltype(compose::__lambda1::operator()::objs)>)(compose::__lambda1::operator()::objs)...))
= bool]'
tests.cpp:75:8: note: 'compose(F&&, Fs&& ...) [with F = const equal(T&&) [with
T = int]::<lambda(const auto:1&)>&; Fs = {std::plus<void>}]::<lambda(auto:2&&
...)> [with auto:2 = {int, int}; decltype (detail::compose(typename
std::is_invocable<std::plus<void>, decltype (objs)...>::type{}, f,
compose(forward<std::plus<void> >(fs#0)),
(forward<decltype(compose::__lambda1::operator()::objs)>)(compose::__lambda1::operator()::objs)...))
= bool]' is not usable as a 'constexpr' function because:
-> decltype(detail::compose(typename
std::is_invocable<decltype(compose(std::forward<Fs>(fs)...)),
decltype(objs)...>::type{},
^~~~~~~~
>From gcc-bugs-return-602991-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 13:02:21 2018
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Subject: [Bug c++/85569] is_invocable(F, decltype(objs)...) fails with "not supported by dump_expr#" unless via indirection
Date: Sun, 29 Apr 2018 13:02:00 -0000
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--- Comment #1 from Björn Fahller <gccbugbjorn at fahller dot se> ---
Created attachment 44038
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44038&action=edit
Test program exposing the bug
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Subject: [Bug c++/85569] is_invocable(F, decltype(objs)...) fails with "not supported by dump_expr#" unless via indirection
Date: Sun, 29 Apr 2018 13:03:00 -0000
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--- Comment #2 from Björn Fahller <gccbugbjorn at fahller dot se> ---
Created attachment 44039
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Preprocessed version of tests.cpp
>From gcc-bugs-return-602994-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 13:08:19 2018
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Subject: [Bug c++/85569] is_invocable(F, decltype(objs)...) fails with "not supported by dump_expr#" unless via indirection
Date: Sun, 29 Apr 2018 13:08:00 -0000
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--- Comment #3 from Andreas Schwab <schwab@linux-m68k.org> ---
*** Bug 85568 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-602993-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 13:08:18 2018
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Subject: [Bug c++/85568] is_invocable(F, decltype(objs)...) fails with "not supported by dump_expr#" unless via indirection
Date: Sun, 29 Apr 2018 13:08:00 -0000
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Andreas Schwab <schwab@linux-m68k.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |DUPLICATE
--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
dup
*** This bug has been marked as a duplicate of bug 85569 ***
>From gcc-bugs-return-602995-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 14:07:49 2018
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From: "ambrop7 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85570] New: Resolution of unqualified-id in member access involving templates fails
Date: Sun, 29 Apr 2018 14:07:00 -0000
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Bug ID: 85570
Summary: Resolution of unqualified-id in member access
involving templates fails
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ambrop7 at gmail dot com
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In the following test program, the resolution of "TheA" in the expression
"b.TheA::func()" fails but should not. According to the C++14 standard in
[basic.lookup.classref] p2, the resolution of unqualified-id "TheA" should be
done in the scope of the class type "B<void>". Therefore it should resolve to
the "TheA" type alias declared in the B class template.
Compilation fails with this error:
main.cpp: In function 'void test()':
main.cpp:13:7: error: 'TheA' has not been declared
b.TheA::func();
^~~~
The code compiles with Clang.
struct A {
void func() {}
};
template <typename T>
struct B : public A {
using TheA = A;
};
template <typename T>
void test() {
B<T> b;
b.TheA::func();
}
int main() {
test<void>();
return 0;
}
>From gcc-bugs-return-602996-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 16:25:02 2018
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Subject: [Bug lto/85571] New: ltobootstrap miscompare with trunk and x86-64
Date: Sun, 29 Apr 2018 16:25:00 -0000
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Bug ID: 85571
Summary: ltobootstrap miscompare with trunk and x86-64
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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I am getting miscompare on almost all .o object files with ltobootstrap
configured as:
configure --disable-multilib --disable-werror --with-build-config=bootstrap-lto
Problem does not reproduce with GCC8 release branch.
>From gcc-bugs-return-602997-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 16:42:28 2018
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Sun, 29 Apr 2018 16:42:00 -0000
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--- Comment #41 from rguenther at suse dot de <rguenther at suse dot de> ---
On April 29, 2018 1:51:58 PM GMT+02:00, "aph at gcc dot gnu.org"
<gcc-bugzilla@gcc.gnu.org> wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65892
>
>--- Comment #40 from Andrew Haley <aph at gcc dot gnu.org> ---
>(In reply to rguenther@suse.de from comment #29)
>
>> Note I repeatedly said this part of the standard is just stupid. It
>makes
>> most if not all type-based alias analysis useless.
>
>I don't think so. It does mean that we'd have to feed all declared
>union types (or, at least the ones containing structs with common
>initial sequences) into the alias oracle. While unpleasant, in that
>simply declaring a type without even declaring an object of that type
>changes code generation, it doesn't render all type-based alias
>analysis useless.
How do you handle this within the LTO framework?
>> Which means I'll refuse any patches implementing it in a way that
>affects
>> default behavior.
>
>Maybe --pedantic or even --pedantic-aliasing?
Whatever you call it I doubt any working solution will fit nicely into our
existing TBAA framework.
When I read the language text then a union declaration in between two accesses
will change the semantic of the second?
>From gcc-bugs-return-603000-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 19:19:45 2018
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Subject: [Bug c++/67225] [concepts] Expression constraint with a constrained result turns off access checking
Date: Sun, 29 Apr 2018 19:19:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-29
Ever confirmed|0 |1
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Testcase from 85555
/*
* Uncommenting the following line and commenting the line after that
* makes the program fail to compile (as it should).
*/
//template<typename Target>
template<typename Target, typename... Ts>
concept bool has_resize ()
{
return requires (Target tgt)
{
{ tgt.resize () };
};
};
template<typename Target>
void resize (Target tgt)
{
if constexpr (has_resize<Target> ())
{
tgt.resize ();
}
}
class MyClass
{
private:
int foo (int i)
{
return i * 2;
}
};
int main ()
{
return MyClass {}.foo (7);
}
>From gcc-bugs-return-602999-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 19:19:20 2018
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Subject: [Bug c++/67225] [concepts] Expression constraint with a constrained result turns off access checking
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |tobias.bruell at gmail dot com
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 85555 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-602998-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 19:19:17 2018
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Subject: [Bug c++/85555] Use of concepts gives access to private members.
Date: Sun, 29 Apr 2018 19:19:00 -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> ---
Thanks, Casey, closing as a dup.
*** This bug has been marked as a duplicate of bug 67225 ***
>From gcc-bugs-return-603001-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 19:22:16 2018
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Subject: [Bug c++/78715] [concepts] Access specifiers ignored after concept declaration
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Does look like a dup of Bug 67225, thanks.
*** This bug has been marked as a duplicate of bug 67225 ***
>From gcc-bugs-return-603003-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 19:22:38 2018
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Subject: [Bug c++/67225] [concepts] Expression constraint with a constrained result turns off access checking
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Testcase from Bug 78715 comment 0:
template <class>
concept bool Dummy = true;
template <typename>
class example {
template <Dummy<> U>
friend auto func();
};
class test {
test() = default;
};
int main()
{
test t;
}
Testcase from Bug 78715 comment 1:
template <class, class>
concept bool C1 = true;
template <class>
concept bool C2 = requires { { 42 } -> C1<int>; };
int main() {
class A { int x; } a;
a.x = 42;
}
Testcase from Bug 78715 comment 2:
template<typename A, typename T>
concept bool SomeConcept = true;
template <typename T>
void breaker(SomeConcept<int>);
class SomeClass {
int privateMember;
};
int main() {
return SomeClass().privateMember;
}
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Subject: [Bug c++/67225] [concepts] Expression constraint with a constrained result turns off access checking
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |tcbrindle at gmail dot com
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 78715 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603004-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 19:23:57 2018
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Subject: [Bug c++/80962] No more access violation control after some declarations using concepts
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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> ---
Dup of Bug 67225
*** This bug has been marked as a duplicate of bug 67225 ***
>From gcc-bugs-return-603005-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 19:24:00 2018
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Subject: [Bug c++/67225] [concepts] Expression constraint with a constrained result turns off access checking
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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CC| |okannen at gmail dot com
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 80962 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603006-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 19:30:57 2018
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Subject: [Bug c/85564] Option "-static" affects the type of generated program
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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> ---
Yes, of course -static changes the type, because it creates a static executable
not a dynamically-linked one.
The behaviour changed when Bug 81523 was fixed, so is intentional and not a
bug.
*** This bug has been marked as a duplicate of bug 81523 ***
>From gcc-bugs-return-603007-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 19:31:02 2018
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Subject: [Bug driver/81523] -static -pie behaves differently depending on if --enable-default-pie is used
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81523
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |alinshans at gmail dot com
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 85564 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603008-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 19:34:10 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85570] Resolution of unqualified-id in member access involving templates fails
Date: Sun, 29 Apr 2018 19:34:00 -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| |2018-04-29
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Confirmed, doesn't seem to be a regression (tested back to 4.3.6)
>From gcc-bugs-return-603009-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 20:36:15 2018
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/82037] Debian 8.8 powerpc64-unknown-linux-gnu bootstrap breaks in stage1 with gcc/liblto_plugin.so: wrong ELF class: ELFCLASS64
Date: Sun, 29 Apr 2018 20:36:00 -0000
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Dennis Clarke <dclarke at blastwave dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |WORKSFORME
--- Comment #11 from Dennis Clarke <dclarke at blastwave dot org> ---
Given that I have both gcc 7.3.0 and gcc 8 rc bootstrapping fine
I would say this is a closed non-issue.
>From gcc-bugs-return-603010-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 29 23:04:56 2018
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Subject: [Bug lto/82229] GCC7's LTO underperforms compared to GCC6
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krzysio.kurek at wp dot pl changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #44025|0 |1
is obsolete| |
--- Comment #26 from krzysio.kurek at wp dot pl ---
Created attachment 44040
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44040&action=edit
Annotates and report logs from perf
I don't have an FTP, I'm just doing this stuff locally by hand.
>From gcc-bugs-return-603011-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 02:16:37 2018
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From: "ian at airs dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug go/85429] Several gotools tests FAIL with Solaris as
Date: Mon, 30 Apr 2018 02:16:00 -0000
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--- Comment #7 from Ian Lance Taylor <ian at airs dot com> ---
Do you think you could work out a patch that handles the various different
cases?
>From gcc-bugs-return-603012-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 02:29:29 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/84842] [7/8/9 Regression] ICE in verify_target_availability, at sel-sched.c:1569
Date: Mon, 30 Apr 2018 02:29:00 -0000
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Arseny Solokha <asolokha at gmx dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|powerpc-*-linux-gnu* |powerpc-*-linux-gnu*,
| |x86_64-unknown-linux-gnu
--- Comment #13 from Arseny Solokha <asolokha at gmx dot com> ---
This one fails for x86_64:
int zq;
void
x3 (int th, int gk)
{
while (th < 1)
{
int w6;
long int s9;
if (th == 0)
{
gk = zq;
w6 = gk;
}
else
w6 = 0;
s9 = !!gk ? th : 1;
gk *= w6 + s9;
++th;
}
}
% x86_64-unknown-linux-gnu-gcc-8.0.0-alpha20180427 -O1 -fschedule-insns
-fsel-sched-pipelining -fselective-scheduling -funroll-all-loops -fno-tree-ch
-fno-tree-loop-im -fno-web -c etlogwpw.c
during RTL pass: sched1
etlogwpw.c: In function 'x3':
etlogwpw.c:23:1: internal compiler error: in verify_target_availability, at
sel-sched.c:1570
}
^
0x64e645 verify_target_availability
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sel-sched.c:1567
0x64e645 find_best_reg_for_expr
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sel-sched.c:1680
0x64e645 fill_vec_av_set
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sel-sched.c:3798
0xc6fbcf fill_ready_list
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sel-sched.c:4028
0xc6fbcf find_best_expr
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sel-sched.c:4388
0xc6fbcf fill_insns
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sel-sched.c:5549
0xc6fbcf schedule_on_fences
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sel-sched.c:7366
0xc6fbcf sel_sched_region_2
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sel-sched.c:7504
0xc71f78 sel_sched_region_1
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sel-sched.c:7546
0xc727fe sel_sched_region(int)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sel-sched.c:7647
0xc73711 run_selective_scheduling()
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sel-sched.c:7733
0xc52e2d rest_of_handle_sched
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sched-rgn.c:3718
0xc52e2d execute
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180427/work/gcc-8-20180427/gcc/sched-rgn.c:3828
(as of r259733).
>From gcc-bugs-return-603013-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 05:47:01 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/85562] -Wsuggest-attribute=malloc misleads about "returning normally"
Date: Mon, 30 Apr 2018 05:47:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic, documentation
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-30
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=51971
Ever confirmed|0 |1
--- Comment #1 from Eric Gallager <egallager at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-603014-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 05:54:12 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 c/85563] [8 regression] -Wmaybe-uninitialized false alarm regression with __builtin_unreachable and GCC 8
Date: Mon, 30 Apr 2018 05:54:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |7.3.0
Keywords| |diagnostic
Last reconfirmed| |2018-04-30
CC| |egallager at gcc dot gnu.org
Blocks| |24639
Ever confirmed|0 |1
Summary|-Wmaybe-uninitialized false |[8 regression]
|alarm regression with |-Wmaybe-uninitialized false
|__builtin_unreachable and |alarm regression with
|GCC 8 |__builtin_unreachable and
| |GCC 8
Known to fail| |8.0.1
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
I had to add -m64 to my command line, but once I did that, I could successfully
reproduce the bug. Confirmed.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24639
[Bug 24639] [meta-bug] bug to track all Wuninitialized issues
>From gcc-bugs-return-603015-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 07:10:56 2018
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Subject: [Bug rtl-optimization/84842] [7/8/9 Regression] ICE in verify_target_availability, at sel-sched.c:1569
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84842
--- Comment #14 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Thanks. I think the root cause on this x86_64 testcase is different.
Arseny, in the meantime if by chance you have another x86_64 variant of this
failure that doesn't require -funroll-all-loops, please post it as well.
>From gcc-bugs-return-603016-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 07:25:20 2018
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Subject: [Bug tree-optimization/28364] poor optimization choices when iterating over a std::string (probably not c++-specific)
Date: Mon, 30 Apr 2018 07:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28364
--- Comment #33 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Apr 30 07:23:36 2018
New Revision: 259754
URL: https://gcc.gnu.org/viewcvs?rev=259754&root=gcc&view=rev
Log:
2018-04-30 Richard Biener <rguenther@suse.de>
PR tree-optimization/28364
PR tree-optimization/85275
* tree-ssa-loop-ch.c (ch_base::copy_headers): Stop after
copying first exit test.
* gcc.dg/tree-ssa/copy-headers-5.c: New testcase.
* gcc.dg/tree-ssa/predcom-8.c: Likewise.
* gcc.dg/tree-ssa/cunroll-13.c: Rewrite to gimple testcase.
* gcc.dg/tree-ssa/ivopt_mult_1.c: XFAIL.
* gcc.dg/tree-ssa/ivopt_mult_1g.c: Add gimple variant that
still passes.
* gcc.dg/tree-ssa/ivopt_mult_2.c: XFAIL.
* gcc.dg/tree-ssa/ivopt_mult_2g.c: Add gimple variant that
still passes.
* gcc.dg/tree-ssa/ssa-dom-thread-7.c: Adjust.
* gcc.dg/tree-ssa/20030710-1.c: Likewise.
* gcc.dg/tree-ssa/20030711-1.c: Likewise.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/copy-headers-5.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/ivopt_mult_1g.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/ivopt_mult_2g.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/predcom-8.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/tree-ssa/20030710-1.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/20030711-1.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/cunroll-13.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/ivopt_mult_1.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/ivopt_mult_2.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-thread-7.c
trunk/gcc/tree-ssa-loop-ch.c
>From gcc-bugs-return-603018-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 07:25:28 2018
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Subject: [Bug tree-optimization/85275] copyheader peels off almost the entire iteration
Date: Mon, 30 Apr 2018 07:25:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Known to work| |9.0
Resolution|--- |FIXED
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug tree-optimization/85275] copyheader peels off almost the entire iteration
Date: Mon, 30 Apr 2018 07:25:00 -0000
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Apr 30 07:23:36 2018
New Revision: 259754
URL: https://gcc.gnu.org/viewcvs?rev=259754&root=gcc&view=rev
Log:
2018-04-30 Richard Biener <rguenther@suse.de>
PR tree-optimization/28364
PR tree-optimization/85275
* tree-ssa-loop-ch.c (ch_base::copy_headers): Stop after
copying first exit test.
* gcc.dg/tree-ssa/copy-headers-5.c: New testcase.
* gcc.dg/tree-ssa/predcom-8.c: Likewise.
* gcc.dg/tree-ssa/cunroll-13.c: Rewrite to gimple testcase.
* gcc.dg/tree-ssa/ivopt_mult_1.c: XFAIL.
* gcc.dg/tree-ssa/ivopt_mult_1g.c: Add gimple variant that
still passes.
* gcc.dg/tree-ssa/ivopt_mult_2.c: XFAIL.
* gcc.dg/tree-ssa/ivopt_mult_2g.c: Add gimple variant that
still passes.
* gcc.dg/tree-ssa/ssa-dom-thread-7.c: Adjust.
* gcc.dg/tree-ssa/20030710-1.c: Likewise.
* gcc.dg/tree-ssa/20030711-1.c: Likewise.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/copy-headers-5.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/ivopt_mult_1g.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/ivopt_mult_2g.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/predcom-8.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/tree-ssa/20030710-1.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/20030711-1.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/cunroll-13.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/ivopt_mult_1.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/ivopt_mult_2.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-thread-7.c
trunk/gcc/tree-ssa-loop-ch.c
>From gcc-bugs-return-603019-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 07:27:19 2018
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Subject: [Bug tree-optimization/28364] poor optimization choices when iterating over a std::string (probably not c++-specific)
Date: Mon, 30 Apr 2018 07:27:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Known to work| |9.0
Resolution|--- |FIXED
--- Comment #34 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug sanitizer/85556] attribute no_sanitize does not accept multiple options as documented
Date: Mon, 30 Apr 2018 07:54:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |documentation,
| |rejects-valid
Status|UNCONFIRMED |NEW
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-603021-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 07:58:26 2018
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Subject: [Bug c++/85557] Incorrect calculation of function arguments with C++17 sequencing rules
Date: Mon, 30 Apr 2018 07:58:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-04-30
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
If they are indeterminately sequenced then 2 is a valid result, no? 4 would be
only required if evaluation order is right-to-left.
>From gcc-bugs-return-603022-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 07:59:55 2018
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Subject: [Bug c++/85558] ICE in make_rtl_for_nonlocal_decl when using static member of template class
Date: Mon, 30 Apr 2018 07:59:00 -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> ---
Confirmed. clang complains:
t.C:4:17: error: friend declaration specifying a default argument must be a
definition
friend void doInitUser(bool = triggerBug::doInit);
^
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Subject: [Bug middle-end/85560] Missed optimization in niter analysis for bit-by-bit variable zeroing
Date: Mon, 30 Apr 2018 08:05:00 -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| |2018-04-30
Component|rtl-optimization |middle-end
Summary|Missed optimization in |Missed optimization in
|bit-by-bit variable zeroing |niter analysis for
| |bit-by-bit variable zeroing
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. GCC fails to prove the loop is finite. This is a niter / SCEV
analysis issue. It's a bit convoluted case so I'm not sure how we can handle
this easily. GIMPLE:
<bb 3> [local count: 955630224]:
# a_10 = PHI <a_5(2), a_6(3)>
# bits_11 = PHI <1(2), bits_7(3)>
_1 = ~bits_11;
a_6 = _1 & a_10;
bits_7 = bits_11 << 1;
if (a_6 == 0)
goto <bb 4>; [11.00%]
else
goto <bb 3>; [89.00%]
we do have the force-simulation code which in theory could also be used
to compute an upper bound rather than an exact niter count. But then for
this case it needs to maintain fuzzy lattices (for bits).
>From gcc-bugs-return-603024-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 08:08:41 2018
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Subject: [Bug middle-end/85563] [8/9 regression] -Wmaybe-uninitialized false alarm regression with __builtin_unreachable and GCC 8
Date: Mon, 30 Apr 2018 08:08:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Component|c |middle-end
Target Milestone|--- |8.2
Summary|[8 regression] |[8/9 regression]
|-Wmaybe-uninitialized false |-Wmaybe-uninitialized false
|alarm regression with |alarm regression with
|__builtin_unreachable and |__builtin_unreachable and
|GCC 8 |GCC 8
>From gcc-bugs-return-603025-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 08:14:11 2018
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Subject: [Bug middle-end/85567] [7/8/9 Regression] internal compiler error: in gimplify_modify_expr, at gimplify.c:5797 when using sincos()
Date: Mon, 30 Apr 2018 08:14:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-04-30
Known to work| |6.4.0
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Target Milestone|--- |7.4
Summary|internal compiler error: in |[7/8/9 Regression] internal
|gimplify_modify_expr, at |compiler error: in
|gimplify.c:5797 when using |gimplify_modify_expr, at
|sincos() |gimplify.c:5797 when using
| |sincos()
Ever confirmed|0 |1
Known to fail| |7.1.0, 8.0.1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. Happens during inlining when folding
# .MEM = VDEF <.MEM>
sincos (x_2(D), sinx_3(D), cosx_4(D));
which runs through the GENERIC call folder which replaces sincos with
cexpi:
*sinx_3(D) = IMAGPART_EXPR <SAVE_EXPR <__builtin_cexpi (x_2(D))>>;, *cosx_4(D)
= REALPART_EXPR <SAVE_EXPR <__builtin_cexpi (x_2(D))>>;
Mine.
>From gcc-bugs-return-603026-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 08:16:45 2018
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Subject: [Bug bootstrap/85571] [9 Regression] non-bootstrap-debug miscompare with trunk
Date: Mon, 30 Apr 2018 08:16:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-04-30
Component|lto |bootstrap
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Summary|ltobootstrap miscompare |[9 Regression]
|with trunk and x86-64 |non-bootstrap-debug
| |miscompare with trunk
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. Happens as soon as we compare debug info thus any build-config
besides bootstrap-debug is affected. Caused by
2018-04-26 Richard Biener <rguenther@suse.de>
* Makefile.tpl (STAGE1_TFLAGS): Add -fno-checking.
(STAGE2_CFLAGS): Likewise.
(STAGE2_TFLAGS): Likewise.
(STAGE3_CFLAGS): Add -fchecking.
(STAGE3_TFLAGS): Likewise.
(STAGEtrain_CFLAGS): Filter out -fchecking.
(STAGEtrain_TFLAGS): Likewise.
* Makefile.in: Re-generate.
I'm testing a (first step) fix.
>From gcc-bugs-return-603027-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 08:17:08 2018
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Subject: [Bug bootstrap/85571] [9 Regression] non-bootstrap-debug miscompare with trunk
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
>From gcc-bugs-return-603028-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 08:18:40 2018
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Subject: [Bug bootstrap/85571] [9 Regression] non-bootstrap-debug miscompare with trunk
Date: Mon, 30 Apr 2018 08:18:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Apr 30 08:18:03 2018
New Revision: 259755
URL: https://gcc.gnu.org/viewcvs?rev=259755&root=gcc&view=rev
Log:
2018-04-30 Richard Biener <rguenther@suse.de>
PR bootstrap/85571
* Makefile.tpl (STAGE3_CFLAGS): Use -fchecking=1.
(STAGE3_TFLAGS): Likewise.
(STAGEtrain_CFLAGS): Filter out -fchecking=1.
(STAGEtrain_TFLAGS): Likewise.
* Makefile.in: Regenerate.
* dwarf2out.c (gen_producer_string): Ignore -fchecking[=].
Modified:
trunk/ChangeLog
trunk/Makefile.in
trunk/Makefile.tpl
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
>From gcc-bugs-return-603029-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 08:21:24 2018
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From: "romain.naour at smile dot fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85180] Infinite loop in RTL DSE optimizer
Date: Mon, 30 Apr 2018 08:21:00 -0000
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--- Comment #16 from romain.naour at smile dot fr ---
Hi,
gcc 7.3.0 is affected by this bug but only on microblaze architecture, see [1].
Do you plan to backport this patch on gcc 7.x?
It is safe to do so without take the risk to break something with other
architecture or optimization level?
Best regards,
Romain
[1] http://lists.busybox.net/pipermail/buildroot/2018-April/220156.html
>From gcc-bugs-return-603030-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 08:22:08 2018
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From: "ixsci at yandex dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85557] Incorrect calculation of function arguments with C++17 sequencing rules
Date: Mon, 30 Apr 2018 08:22:00 -0000
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--- Comment #2 from Evgeniy Shcherbina <ixsci at yandex dot ru> ---
There is 2 parameter calculations: "first" and "second", no matter what is
evaluated first or second, the "first" parameter should be initialized with `i
= 1`, and "second" with `i = 2`. So "first" should always be equal to 1 and
"second" to 2. Currently it works as if the value assignment to parameters is
done after the both arguments are calculated which to my knowledge is wrong.
Argument calculation and parameter assignment is an atomic step as far as other
parameters are concerned.
>From gcc-bugs-return-603031-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 08:22:42 2018
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Subject: [Bug go/85429] Several gotools tests FAIL with Solaris as
Date: Mon, 30 Apr 2018 08:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85429
--- Comment #8 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #7 from Ian Lance Taylor <ian at airs dot com> ---
> Do you think you could work out a patch that handles the various different
> cases?
Sure, if I can figure out how to determine whether or not gas is in use.
>From gcc-bugs-return-603032-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 08:24:48 2018
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Subject: [Bug rtl-optimization/85180] Infinite loop in RTL DSE optimizer
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--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to romain.naour from comment #16)
> Hi,
>
> gcc 7.3.0 is affected by this bug but only on microblaze architecture, see
> [1].
> Do you plan to backport this patch on gcc 7.x?
> It is safe to do so without take the risk to break something with other
> architecture or optimization level?
>
> Best regards,
> Romain
>
> [1] http://lists.busybox.net/pipermail/buildroot/2018-April/220156.html
The bug isn't a regression so technically it doesn't qualify. OTOH it
looks reasonably safe to backport and the bug is annoying. Jakub, would
you be ok with a backport?
>From gcc-bugs-return-603033-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 09:03:13 2018
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From: "aph at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Mon, 30 Apr 2018 09:03:00 -0000
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--- Comment #42 from Andrew Haley <aph at gcc dot gnu.org> ---
On 04/29/2018 05:42 PM, rguenther at suse dot de wrote:>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65892
>
> --- Comment #41 from rguenther at suse dot de <rguenther at suse dot de> ---
> On April 29, 2018 1:51:58 PM GMT+02:00, "aph at gcc dot gnu.org"
> <gcc-bugzilla@gcc.gnu.org> wrote:
>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65892
>>
>> --- Comment #40 from Andrew Haley <aph at gcc dot gnu.org> ---
>> (In reply to rguenther@suse.de from comment #29)
>>
>>> Note I repeatedly said this part of the standard is just stupid. It
>> makes
>>> most if not all type-based alias analysis useless.
>>
>> I don't think so. It does mean that we'd have to feed all declared
>> union types (or, at least the ones containing structs with common
>> initial sequences) into the alias oracle. While unpleasant, in that
>> simply declaring a type without even declaring an object of that type
>> changes code generation, it doesn't render all type-based alias
>> analysis useless.
>
> How do you handle this within the LTO framework?
In order to use type-based alias analysis in any LTO framework it's
necessary to save type information, and this is just more type
information. The question is, I suppose, how to handle the scopes of
union declarations. I'd just treat them as being global, which in
practice isn't unrealistic because such declarations are in header
files in global scope and shared anyway.
So, if any union types with a common initial sequence are declared
anywhere in a program, then their member types alias. Alternatively,
a tighter implementation might restrict such declarations to a
compilation unit, in which case the alias oracle would scan only the
union types declared in that unit.
>>> Which means I'll refuse any patches implementing it in a way that
>>> affects default behavior.
>>
>> Maybe --pedantic or even --pedantic-aliasing?
>
> Whatever you call it I doubt any working solution will fit nicely
> into our existing TBAA framework.
Well, perhaps not, but this is the language specification.
> When I read the language text then a union declaration in between
> two accesses will change the semantic of the second?
Not necessarily. It would be correct to collect all union
declarations at the end of parsing and then use those to feed the
alias oracle. There's no actual need to restrict their scope. Sure,
it would lead to GCC being somewhat over-cautious, but that's OK.
>From gcc-bugs-return-603034-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 09:19:20 2018
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Mon, 30 Apr 2018 09:19:00 -0000
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--- Comment #43 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Andrew Haley from comment #42)
> On 04/29/2018 05:42 PM, rguenther at suse dot de wrote:>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65892
> >
> > --- Comment #41 from rguenther at suse dot de <rguenther at suse dot de> ---
> > On April 29, 2018 1:51:58 PM GMT+02:00, "aph at gcc dot gnu.org"
> > <gcc-bugzilla@gcc.gnu.org> wrote:
> >> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65892
> >>
> >> --- Comment #40 from Andrew Haley <aph at gcc dot gnu.org> ---
> >> (In reply to rguenther@suse.de from comment #29)
> >>
> >>> Note I repeatedly said this part of the standard is just stupid. It
> >> makes
> >>> most if not all type-based alias analysis useless.
> >>
> >> I don't think so. It does mean that we'd have to feed all declared
> >> union types (or, at least the ones containing structs with common
> >> initial sequences) into the alias oracle. While unpleasant, in that
> >> simply declaring a type without even declaring an object of that type
> >> changes code generation, it doesn't render all type-based alias
> >> analysis useless.
> >
> > How do you handle this within the LTO framework?
>
> In order to use type-based alias analysis in any LTO framework it's
> necessary to save type information, and this is just more type
> information. The question is, I suppose, how to handle the scopes of
> union declarations. I'd just treat them as being global, which in
> practice isn't unrealistic because such declarations are in header
> files in global scope and shared anyway.
>
> So, if any union types with a common initial sequence are declared
> anywhere in a program, then their member types alias. Alternatively,
> a tighter implementation might restrict such declarations to a
> compilation unit, in which case the alias oracle would scan only the
> union types declared in that unit.
So for the middle-end the easiest thing would be if the FE would comply
to its existing semantics and for the initial sequences generate a
transparent struct. Thus,
union {
struct A { int i; float f; double z; } a;
struct B { int i; float f; void *p; } b;
};
would cause the FE to "implement" struct A and B like
struct __init_seq1 { int i; float f; };
struct A { struct __init_seq1 _transp_memb1; double z; } a;
struct B { struct __init_seq1 _transp_memb2; void *p; } b;
then everything would work as expected from an aliasing point of view.
The difficulty is probably that argument passing of A and B might
change depending on how the ABIs are defined and how the backend handles
those wrapping structs.
But as you can clearly see the above would be also a way for the user
to get what the clause permits without the clause being present. So
I'm not sure why this clause was added.
> >>> Which means I'll refuse any patches implementing it in a way that
> >>> affects default behavior.
> >>
> >> Maybe --pedantic or even --pedantic-aliasing?
> >
> > Whatever you call it I doubt any working solution will fit nicely
> > into our existing TBAA framework.
>
> Well, perhaps not, but this is the language specification.
language specifications have defects ...
> > When I read the language text then a union declaration in between
> > two accesses will change the semantic of the second?
>
> Not necessarily. It would be correct to collect all union
> declarations at the end of parsing and then use those to feed the
> alias oracle. There's no actual need to restrict their scope. Sure,
> it would lead to GCC being somewhat over-cautious, but that's OK.
given the TBAA oracle is filled on-demand it is important that both
outcomes are allowed. I still don't see how we can make it work easily
in the middle-end.
For anyone wanting to make GCC comply I suggest the above sketched route
and start with looking how backends deal with this kind of wrapping in
their argument passing.
>From gcc-bugs-return-603035-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 09:33:40 2018
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From: "kretz at kde dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85572] New: faster code for absolute value of __v2di
Date: Mon, 30 Apr 2018 09:33:00 -0000
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Bug ID: 85572
Summary: faster code for absolute value of __v2di
Product: gcc
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The absolute value for 64-bit integer SSE vectors is only optimized when
AVX512VL is available. Test case (`-O2 -ffast-math` and one of -mavx512vl,
-msse4, or -msse2):
#include <x86intrin.h>
__v2di abs(__v2di x) {
return x < 0 ? -x : x;
}
With SSE4 I suggest:
abs(long long __vector(2)):
pxor %xmm1, %xmm1
pcmpgtq %xmm0, %xmm1
pxor %xmm1, %xmm0
psubq %xmm1, %xmm0
ret
in C++:
auto neg = reinterpret_cast<__v2di>(x < 0);
return (x ^ neg) - neg;
Without SSE4:
abs(long long __vector(2)):
movdqa %xmm0, %xmm2
pxor %xmm1, %xmm1
psrlq $63, %xmm2
psubq %xmm2, %xmm1
pxor %xmm1, %xmm0
paddq %xmm2, %xmm0
ret
in C++:
auto neg = -reinterpret_cast<__v2di>(reinterpret_cast<__v2du>(x) >> 63);
return (x ^ neg) - neg;
related issue for scalars: #67510
>From gcc-bugs-return-603036-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 09:40:59 2018
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Subject: [Bug bootstrap/85571] [9 Regression] non-bootstrap-debug miscompare with trunk
Date: Mon, 30 Apr 2018 09:40:00 -0000
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Not yet fixed. As we compare LTO bytecode but that includes the .opts section
we now have -f[no-]checking there... We can't remove it there since we of
course want to have different settings at link-time. A custom do-compare
script like bootstrap-debug.mk provides might be a workaround for this
particular
issue.
Maybe time to finally not compare LTO bytecode (but then we need to compare
binaries which we don't do - but we could now that we share the checksums).
OTOH stage2 and stage3 cc1 even differ in the size of the .text section...
So we have "real" bugs to fix here as well it seems ;)
>From gcc-bugs-return-603037-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 09:52:04 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 bootstrap/85571] [9 Regression] non-bootstrap-debug miscompare with trunk
Date: Mon, 30 Apr 2018 09:52:00 -0000
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
contrib/compare-debug strips off LTO sections but that would leave us with a
no-op compare. On any target using non-native sections just stripping
.gnu.lto_.opts
will be difficult in such script, so we'd need to build a compare-lto tool
and use that.
But as said, comparing LTO bytecode is of questionable value and comparing the
binaries doesn't work...
>From gcc-bugs-return-603038-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 09:53:51 2018
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Mon, 30 Apr 2018 09:53:00 -0000
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--- Comment #44 from Davin McCall <davmac at davmac dot org> ---
> Well, perhaps not, but this is the language specification.
The "one special guarantee" clause appears in the section describing union
member access via the "." or "->" operators, implying that it only applies to
the access of union members via the union. As has been pointed out by others,
the guarantee is surely not meant to trump all other rules regarding access, so
this is a reasonable interpretation (since otherwise, it is totally unclear
when it does apply and what exactly "it is permitted" even means).
Note that without that clause, type punning structs via a union would
essentially be impossible (since layout is implementation defined or
unspecified). The "common initial sequence" requirement is the only part of the
standard which requires that structs with similar members have them layed out
in the same order and alignment. Since this only matters for type punning, it
again makes sense that this would be specified in the one section which
actually allows for type punning (even if only in a non-normative footnote) -
that is, union member access via a union. It's clear why it is needed for this,
but to extend that to any access of union members (including not via the union)
seems like a stretch. If that was intended, why isn't it specified in 6.5?
The only thing that suggests an alternative interpretation to what I've
described above is the requirement that the declaration of the completed type
of the union be visible, which is redundant if the access must be via the union
type. However, interpreting this to mean that the "special guarantee" applies
globally is far more problematic than assuming that the requirement is just
redundant.
>From gcc-bugs-return-603039-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 09:54:27 2018
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Subject: [Bug bootstrap/85571] [9 Regression] non-bootstrap-debug miscompare with trunk
Date: Mon, 30 Apr 2018 09:54:00 -0000
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
The following should work:
Index: config/bootstrap-lto.mk
===================================================================
--- config/bootstrap-lto.mk (revision 259755)
+++ config/bootstrap-lto.mk (working copy)
@@ -1,5 +1,7 @@
# This option enables LTO for stage2 and stage3 in slim mode
+do-compare = /bin/true
+
STAGE2_CFLAGS += -flto=jobserver -frandom-seed=1
STAGE3_CFLAGS += -flto=jobserver -frandom-seed=1
STAGEprofile_CFLAGS += -flto=jobserver -frandom-seed=1
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Subject: [Bug bootstrap/85571] [9 Regression] non-bootstrap-debug miscompare with trunk
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Or more sophisticated allow to override/amend what we compare in the .mk
snippets
and compare $(exeext) instead of ($objext) for bootstrap-lto.
>From gcc-bugs-return-603041-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 10:18:01 2018
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Subject: [Bug bootstrap/85571] [9 Regression] non-bootstrap-debug miscompare with trunk
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--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 44041
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44041&action=edit
patch
Like this. Will fail as well because cc1 will differ (does not differ without
LTO).
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Subject: [Bug target/85572] faster code for absolute value of __v2di
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-30
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, looks like C doesn't like the conditional. Eh. Confirmed with C++ where
we expand to piecewise operation.
The target needs to provide abs patterns if that shouldn't happen.
>From gcc-bugs-return-603043-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 11:24:46 2018
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Subject: [Bug bootstrap/85571] [9 Regression] non-bootstrap-debug miscompare with trunk
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
So even w/o the -f[no-]checking flags I see then when comparing stage2 and
stage3 cc1:
> readelf -S /abuild/rguenther/obj/prev-gcc/cc1 | grep -C 1 .text
0000000000000008 0000000000000008 AX 0 0 8
[14] .text PROGBITS 000000000057be60 0017be60
0000000000feb92a 0000000000000000 AX 0 0 16
> readelf -S /abuild/rguenther/obj/gcc/cc1 | grep -C 1 .text
0000000000000008 0000000000000008 AX 0 0 8
[14] .text PROGBITS 000000000057be60 0017be60
0000000000feb5ba 0000000000000000 AX 0 0 16
assembly shows (after stripping reloc offset differences - bah, objdump
should have a way to substitute zero for all of those):
@@ -11420,24 +11420,6 @@
xx: xx xx xx mov %rxx,%rdi
xx: xx xx xx xx xx mov $0xb,%esi
xx: xx xx xx xx xx xxllq xx
<_Zxxtrxx_contains_struct_chxxk_xxilxx
PK9trxx_noxxtrxx_noxx_structure_enumPKciS4_>
- xx: xx xx xx mov %r8,%rdi
- xx: xx xx xx xx xx xxllq xx
<_ZLxxi_tag_bindingP9trxx_noxx.part.xx
>
- xx: xx xx xx mov %rxx,%rdi
- xx: xx xx xx xx xx xxllq xx
<_ZLxxi_symbol_bindingP9trxx_noxx.part
.xx>
- xx: xx xx xx mov %r8,%rdi
- xx: xx xx xx xx xx xxllq xx
<_ZLxxi_tag_bindingP9trxx_noxx.part.xx
>
- xx: xx xx xx mov %rxx,%rdi
- xx: xx xx xx xx xx xxllq xx
<_ZLxxi_symbol_bindingP9trxx_noxx.part
.xx>
- xx: xx xx xx xx xx mov $0xxx,%xxx
- xx: xx xx xx xx xx mov $0xxx,%esi
- xx: xx xx xx xx xx mov $0xxx,%xxi
- xx: xx xx xx xx xx xxllq xx <_Zxxncy_xxortPKciS0_>
- xx: xx xx xx xx xx xx mov $0xxx,%rxx
- xx: xx xx xx xx xx mov $0xxx,%xxx
- xx: xx xx xx xx xx mov $0xxx,%xxx
- xx: xx xx xx mov %rxx,%rdi
- xx: xx xx xx xx xx mov $0x1,%esi
- xx: xx xx xx xx xx xxllq xx
<_Zxxtrxx_contains_struct_chxxk_xxilxxPK9trxx_noxxtrxx_noxx_structure_enumPKciS4_>
xx: xx xx xx xx xx xx mov $0xxx,%rxx
xx: xx xx xx xx xx mov $0xxx,%xxx
xx: xx xx xx xx xx mov $0xxx,%xxx
@@ -11480,6 +11462,20 @@
xx: xx xx xx xx xx mov $0xxx,%esi
xx: xx xx xx mov %rxx,%rdi
xx: xx xx xx xx xx xxllq xx
<_Zxxtrxx_chxxk_xxilxxPK9trxx_noxxPKciS3_z>
+ xx: xx xx xx mov %r8,%rdi
+ xx: xx xx xx xx xx xxllq xx
<_ZLxxi_tag_bindingP9trxx_noxx.part.xx>
+ xx: xx xx xx mov %rxx,%rdi
+ xx: xx xx xx xx xx xxllq xx
<_ZLxxi_symbol_bindingP9trxx_noxx.part.xx>
+ xx: xx xx xx xx xx mov $0xxx,%xxx
+ xx: xx xx xx xx xx mov $0xxx,%esi
+ xx: xx xx xx xx xx mov $0xxx,%xxi
+ xx: xx xx xx xx xx xxllq xx <_Zxxncy_xxortPKciS0_>
+ xx: xx xx xx xx xx xx mov $0xxx,%rxx
+ xx: xx xx xx xx xx mov $0xxx,%xxx
+ xx: xx xx xx xx xx mov $0xxx,%xxx
+ xx: xx xx xx mov %rxx,%rdi
+ xx: xx xx xx xx xx mov $0x1,%esi
+ xx: xx xx xx xx xx xxllq xx
<_Zxxtrxx_contains_struct_chxxk_xxilxxPK9trxx_noxxtrxx_noxx_structure_enumPKciS4_>
xx: xx xx xx xx xx xx mov $0xxx,%rxx
xx: xx xx xx xx xx mov $0xxx,%xxx
xx: xx xx xx xx xx mov $0xxx,%xxx
...
xx <_ZLxx_parser_postfix_expressionPxx_parser.cold.xx>:
- xx: xx xx xx xx xx xxllq xx
<_ZN3vxxIxxva_hxxp6vl_ptrExxquick_pushERKb.isra.xx.part.xx>
+ xx: xx xx xx xx xx xxllq xx
<_ZN3vxxIxxva_hxxp6vl_ptrEixEj.isra.xx.part.xx>
xx: xx xx xx xx xx xx mov $0xxx,%rxx
so different BB re-ordering / partitioning?
For example in the case of gengtype from stage2/stage3 .text has the same size
but .debug_info size differs by one byte. But gentype code differs as well:
@@ -2884,6 +2884,7 @@
xx: xx xx xx xx xx xxllq xx <_ZLxxpxxk_state_tokeni>
xx: xx xx xx xx xx mov $0x1,%xxi
xx: xx xx xx mov %rax,%rxx
+ xx: xx xx xx xx mov %rax,(%rsp)
xx: xx xx xx xx xx xxllq xx <_ZLxxpxxk_state_tokeni>
xx: xx xx xx xx xx mov $0x2,%xxi
xx: xx xx xx mov %rax,%rbp
...
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Subject: [Bug bootstrap/85571] [9 Regression] non-bootstrap-debug miscompare with trunk
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--- Comment #9 from Jan Hubicka <hubicka at ucw dot cz> ---
>
> so different BB re-ordering / partitioning?
That would be probably best visible from bb-reorder dumps. However...
>
> For example in the case of gengtype from stage2/stage3 .text has the same size
> but .debug_info size differs by one byte. But gentype code differs as well:
>
> @@ -2884,6 +2884,7 @@
> xx: xx xx xx xx xx xxllq xx <_ZLxxpxxk_state_tokeni>
> xx: xx xx xx xx xx mov $0x1,%xxi
> xx: xx xx xx mov %rax,%rxx
> + xx: xx xx xx xx mov %rax,(%rsp)
This is something else and such changes may make partitioning to diverge. So
perhaps
first debug this one?
> xx: xx xx xx xx xx xxllq xx <_ZLxxpxxk_state_tokeni>
> xx: xx xx xx xx xx mov $0x2,%xxi
> xx: xx xx xx mov %rax,%rbp
> ...
>
> --
> You are receiving this mail because:
> You reported the bug.
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From: "sylvain.bertrand at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85573] New: gcc 7.3.0 cannot compile recent LLVM for AMD GPU shaders
Date: Mon, 30 Apr 2018 11:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85573
Bug ID: 85573
Summary: gcc 7.3.0 cannot compile recent LLVM for AMD GPU
shaders
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sylvain.bertrand at gmail dot com
Target Milestone: ---
I tried to compile a recent LLVM for AMD GPU shaders, but was unable due to the
compilation error reported here:
https://bugs.llvm.org/show_bug.cgi?id=37287
It seems the c++ used in recent LLVM hits something unimplemented in g++.
>From gcc-bugs-return-603046-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 11:58:43 2018
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Subject: [Bug c++/85573] gcc 7.3.0 cannot compile recent LLVM for AMD GPU shaders
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-04-30
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
As requested when creating this bug, please read https://gcc.gnu.org/bugs and
provide the necessary information (at the very least the output of gcc -v and
preprocessed source).
>From gcc-bugs-return-603047-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 12:31:09 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/85571] [9 Regression] non-bootstrap-debug miscompare with trunk
Date: Mon, 30 Apr 2018 12:31:00 -0000
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--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
On the gcc-8 branch cc1 and friends compare OK so this is a recent regression.
Will try with checking enabled to be extra sure. Then there are only few
changes on trunk that are suspicious.
+/* Compare types based on source file location. */
+
+static int
+cmp_type_location (const void *p1_, const void *p2_)
+{
+ tree *p1 = (tree*)(const_cast<void *>(p1_));
+ tree *p2 = (tree*)(const_cast<void *>(p2_));
+ if (*p1 == *p2)
+ return 0;
+
+ tree tname1 = TYPE_NAME (*p1);
+ tree tname2 = TYPE_NAME (*p2);
+
+ const char *f1 = DECL_SOURCE_FILE (tname1);
+ const char *f2 = DECL_SOURCE_FILE (tname2);
+
+ int r = strcmp (f1, f2);
+ if (r == 0)
this should probably split paths.
+ /* Register ODR types. */
+ for (unsigned i = 0; i < odr_types.length (); i++)
+ register_odr_type (odr_types[i]);
I suspect the order may have effects on code-generation.
>From gcc-bugs-return-603048-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 12:43:11 2018
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Subject: [Bug c++/85573] gcc 7.3.0 cannot compile recent LLVM for AMD GPU shaders
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Manuel Lauss <manuel.lauss at googlemail dot com> changed:
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----------------------------------------------------------------------------
CC| |manuel.lauss at googlemail dot com
--- Comment #2 from Manuel Lauss <manuel.lauss at googlemail dot com> ---
Works with gcc-7.3.1 for me, latest llvm git snapshot.
>From gcc-bugs-return-603049-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 12:57:10 2018
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Subject: [Bug c++/85573] gcc 7.3.0 cannot compile recent LLVM for AMD GPU shaders
Date: Mon, 30 Apr 2018 12:57:00 -0000
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--- Comment #3 from Sylvain Bertrand <sylvain.bertrand at gmail dot com> ---
On Mon, Apr 30, 2018 at 12:43:04PM +0000, manuel.lauss at googlemail dot com
wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85573
>
> Manuel Lauss <manuel.lauss at googlemail dot com> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> CC| |manuel.lauss at googlemail dot com
>
> --- Comment #2 from Manuel Lauss <manuel.lauss at googlemail dot com> ---
> Works with gcc-7.3.1 for me, latest llvm git snapshot.
Then I guess I'll wait for the release of 7.3.1 or 8.1 then (will arrive soon I
guess). If it works, I'll notify the llvm "guys" to update their compilation
requirements to gcc 7.3.1 and gcc 8.1 (it was gcc 4.8.0).
I got many miscompilations resulting in segfaults in recent git gcc, that's why
I prefer to wait for an official release.
>From gcc-bugs-return-603050-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 13:02:30 2018
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Subject: [Bug c++/85573] gcc 7.3.0 cannot compile recent LLVM for AMD GPU shaders
Date: Mon, 30 Apr 2018 13:02:00 -0000
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
7.3.1 will never be released, it's a post-7.3.0 and pre-7.4.0 development
snapshot.
If you are getting segfaults from snapshots now and you don't report them then
the final release is likely to have the same segfaults.
>From gcc-bugs-return-603052-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 13:04:18 2018
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Subject: [Bug lto/85574] [9 Regression] LTO bootstapped binaries differ
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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-603051-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 13:04:05 2018
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Subject: [Bug lto/85574] New: [9 Regression] LTO bootstapped binaries differ
Date: Mon, 30 Apr 2018 13:04:00 -0000
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Bug ID: 85574
Summary: [9 Regression] LTO bootstapped binaries differ
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: needs-bisection
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
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CC: marxin at gcc dot gnu.org
Target Milestone: ---
See PR85571 (which is about LTO IL differences). Binaries like cc1 and
build/gengtype differ between stage2 and stage3. This is a regression from
GCC8
where they compare just fine (double-checked with and without checking for
c,c++ bootstrap-lto).
I tried the attached but it doesn't help so I suspect the partitioning changes
instead (unstable sorts?).
>From gcc-bugs-return-603053-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 13:11:11 2018
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|WAITING |NEW
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
"The initialization of a parameter, including every associated value
computation and side effect, is indeterminately sequenced with respect to that
of any other parameter."
That's indeterminately sequenced, not unsequenced:
"Evaluations A and B are indeterminately sequenced when either A is sequenced
before B or B is sequenced before A, but it is unspecified which. [ Note:
Indeterminately sequenced evaluations cannot overlap, but either could
be executed first. — end note ]"
So the function is called as foo(1, 2), but it's unspecified whether i==1 or
i==2 afterwards.
>From gcc-bugs-return-603054-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 13:16:49 2018
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Subject: [Bug c++/77840] List-initialization and copy-constructor
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |INVALID
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Closing as invalid based on my comments above.
>From gcc-bugs-return-603055-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 13:21:20 2018
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Subject: [Bug c++/70395] [C++11] Error when initializing array of non-copyable non-trivial type in constructor initializer list
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> Probably a dup of PR 63707
I'll add this testcase there.
*** This bug has been marked as a duplicate of bug 63707 ***
>From gcc-bugs-return-603056-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 13:21:21 2018
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Subject: [Bug c++/63707] Brace initialization of array sometimes fails if no copy constructor
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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CC| |mosra at centrum dot cz
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 70395 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603057-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 13:22:01 2018
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Subject: [Bug c++/63707] Brace initialization of array sometimes fails if no copy constructor
Date: Mon, 30 Apr 2018 13:22:00 -0000
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--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Testcase from PR 70395
struct NonCopyable {
NonCopyable(const NonCopyable&) = delete;
NonCopyable(NonCopyable&&) = delete;
NonCopyable& operator=(const NonCopyable&) = delete;
NonCopyable& operator=(NonCopyable&&) = delete;
NonCopyable() {}
~NonCopyable() {} // to make it non-trivial
};
struct A {
A(): _a{} {}
~A() {}
NonCopyable _a[5];
} a;
>From gcc-bugs-return-603058-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 13:24:54 2018
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Subject: [Bug c++/54835] [C++11][DR 1518] Explicit default constructors not respected during copy-list-initialization
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--- Comment #17 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Jason, should this be FIXED instead of SUSPENDED?
>From gcc-bugs-return-603059-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 13:26:20 2018
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85575] New: Acceptance of invalid code: ordering of declaration statements with implicit typing
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Bug ID: 85575
Summary: Acceptance of invalid code: ordering of declaration
statements with implicit typing
Product: gcc
Version: 8.0.1
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I think I saw discussions on this topic already on c.l.f. I am having the
following subroutine (and the recursive attribute doesn't play a role)
1 recursive function constr_quark_loopline(ho,sho) result(cl)
2 integer, dimension(sho), intent(in) :: ho
3 integer, dimension(sho) :: hor
4 integer, intent(in) :: sho
5 [...]
6 end function constr_quark_loopline
Intel gives an error message error #6415: This name cannot be assigned this
data type because it conflicts with prior uses of the name. [SHO]
in the case this is an external procedure, or a module procedure with or
without 'implicit none' in the head of the module.
First of all, I would like to get it confirmed that this is really a
contradiction of the standard, and that the order of the declarations matters.
In case this is a module procedure without implicit none or an external
procedure, implicit typing rules apply and sho would be considered to be a
real, such that later specifying it as an integer is a contradiction. gfortran
and nagfor complain:
integer, intent(in) :: sho
1
Error: Symbol ‘sho’ at (1) already has basic type of REAL
and
Error: rec.f90, line 8: Symbol SHO has already been implicitly typed
detected at SHO@<end-of-statement>
The strange thing (which seems a compiler bug to me) is that gfortran compiles
this code when it is a module procedure with 'implicit none'. This seems a
(gfortran) compiler bug to me to accept this code. I see this behavior with all
gfortran versions that I can get a hold on, 4.8, 4.9., 5.4, 6.3, 7.3, 8.0 and
9.0. That is the reason I filed this report. Comments are appreciated.
And yes, of course, I know that having the declaration of sho first solves all
the problems, but this is 3rd-party code.
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Subject: [Bug c++/85576] New: A template union containing a friend function causes non-template type used as a template error
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Bug ID: 85576
Summary: A template union containing a friend function causes
non-template type used as a template error
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For this code:
template <typename T>
union Union {
friend bool operator==(const Union& a, const Union& b) {
return true;
}
T t;
};
Union<int> i;
GCC reports an error:
<source>:9:10: error: non-template type 'Union' used as a template
Union<int> i;
^
Clang and MSVC both accept this code: https://godbolt.org/g/S9p7hw
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Subject: [Bug c++/85576] A template union containing a friend function causes non-template type used as a template error
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Subject: [Bug c++/85577] New: list-initialization chooses initializer-list constructor
Date: Mon, 30 Apr 2018 13:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85577
Bug ID: 85577
Summary: list-initialization chooses initializer-list
constructor
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
namespace std
{
typedef long unsigned int size_t;
template<class _E>
class initializer_list
{
public:
typedef _E value_type;
typedef const _E& reference;
typedef const _E& const_reference;
typedef size_t size_type;
typedef const _E* iterator;
typedef const _E* const_iterator;
private:
iterator _M_array;
size_type _M_len;
constexpr initializer_list(const_iterator __a, size_type __l)
: _M_array(__a), _M_len(__l) { }
public:
constexpr initializer_list() : _M_array(0), _M_len(0) { }
constexpr size_type
size() { return _M_len; }
constexpr const_iterator
begin() { return _M_array; }
constexpr const_iterator
end() { return begin() + size(); }
};
template<typename T> T&& move(T& t) { return static_cast<T&&>(t); }
template<typename T>
struct vector {
vector(vector&&) noexcept { }
vector(initializer_list<T>) = delete;
};
}
struct A {
A(A const&) = delete;
A& operator=(A const&) = delete;
A(A&&) = default;
A& operator=(A&&) = default;
A(std::vector<A>&& v) : v{std::move(v)} { }
std::vector<A> v;
};
v.ii: In constructor ‘A::A(std::vector<A>&&)’:
v.ii:54:41: error: use of deleted function
‘std::vector<T>::vector(std::initializer_list<T>) [with T = A]’
A(std::vector<A>&& v) : v{std::move(v)} { }
^
v.ii:45:5: note: declared here
vector(initializer_list<T>) = delete;
^~~~~~
The move constructor should be used, not the initialize-list one.
>From gcc-bugs-return-603063-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 13:45:56 2018
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Subject: [Bug c++/85577] list-initialization chooses initializer-list constructor
Date: Mon, 30 Apr 2018 13:45:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-30
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Clang and EDG accept it.
>From gcc-bugs-return-603065-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 15:01:42 2018
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84829] -mieee-fp causes to link with -lieee but that is no longer available
Date: Mon, 30 Apr 2018 15:01:00 -0000
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--- Comment #14 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
As I said in comment#10, I think the solution is to remove the specs
making -mieee-fp imply -lieee. (Principally the spec in gnu-user.h. I
don't think this should depend on what libc is in use. No doubt the
similar spec in m32r/linux.h should be changed similarly, though I'm not
aware of a glibc port to m32r, don't know what libc was used with that
port, and the Linux kernel port to m32r has now been removed along with
several others for 4.17.)
>From gcc-bugs-return-603064-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 15:01:36 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 lto/85574] [9 Regression] LTO bootstapped binaries differ
Date: Mon, 30 Apr 2018 15:01:00 -0000
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Jan Hubicka <hubicka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hubicka at gcc dot gnu.org
--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Attachement seems to be missing. How do I reproduce it?
The partitioning changes are not really affecting any sorting. The changes
will be null with -flto-partitioning=<anything except for ballanced>
>From gcc-bugs-return-603066-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 15:02:35 2018
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Subject: [Bug c/81405] [8 Regression] Buffer overflow when consolidating printing of out-of-order fix-it hints
Date: Mon, 30 Apr 2018 15:02:00 -0000
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--- Comment #5 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Author: dmalcolm
Date: Mon Apr 30 15:01:56 2018
New Revision: 259768
URL: https://gcc.gnu.org/viewcvs?rev=259768&root=gcc&view=rev
Log:
Use char_span for return type of location_get_source_line
location_get_source_line returns a const char * that isn't 0-terminated,
writing back a length through an int * param.
This is error-prone, as all call-sites have to take into account the
lack of 0-termination, and respect the length of the buffer.
It's cleaner to bundle together this pointer+length state into a class,
so this patch does so, reusing the "char_span" class that I introduced
in r250187 (as part of the fix for PR c/81405).
The patch also adds assertions to all access to the char_span.
gcc/c-family/ChangeLog:
* c-format.c (get_corrected_substring): Update for
location_get_source_line returning a char_span. Use a char_span
when handling the prefix of the correction.
* c-indentation.c (get_visual_column): Update for
location_get_source_line returning a char_span.
(get_first_nws_vis_column): Likewise.
gcc/ChangeLog:
* diagnostic-show-locus.c (layout::layout): Update for
location_get_source_line returning a char_span.
(struct char_span): Move to input.h.
(struct correction): Update for fields in char_span becoming
private.
(struct source_line): Update for location_get_source_line
returning a char_span.
(layout::print_line): Likewise.
* edit-context.c (edited_file::print_content): Likewise.
(edited_file::print_diff_hunk): Likewise.
(edited_file::print_run_of_changed_lines): Likewise.
(edited_file::get_num_lines): Likewise.
(edited_line::edited_line): Likewise.
* final.c (asm_show_source): Likewise.
* input.c (location_get_source_line): Convert return type
from const char * to char_span, losing the final "line_len"
param.
(dump_location_info): Update for the above.
(get_substring_ranges_for_loc): Likewise. Use a char_span
when handling the literal within the line.
(test_reading_source_line): Update for location_get_source_line
returning a char_span.
* input.h (class char_span): Move here from
diagnostic-show-locus.c, converting from a struct to a class.
Make data members private.
(char_span::operator bool): New.
(char_span::length): New.
(char_span::get_buffer): New.
(char_span::operator[]): New.
(char_span::subspan): Make const.
(char_span::xstrdup): New.
(location_get_source_line): Convert return type from const char *
to char_span, losing the final "line_size" param.
gcc/testsuite/ChangeLog:
* gcc.dg/plugin/diagnostic_plugin_test_show_locus.c
(test_show_locus): Update for location_get_source_line returning a
char_span. Use char_span for handling words in the
"test_many_nested_locations" fix-it example.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c-format.c
trunk/gcc/c-family/c-indentation.c
trunk/gcc/diagnostic-show-locus.c
trunk/gcc/edit-context.c
trunk/gcc/final.c
trunk/gcc/input.c
trunk/gcc/input.h
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/plugin/diagnostic_plugin_test_show_locus.c
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Subject: [Bug c++/61982] Optimizer does not eliminate stores to destroyed objects
Date: Mon, 30 Apr 2018 15:21:00 -0000
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--- Comment #18 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Mon Apr 30 15:21:01 2018
New Revision: 259772
URL: https://gcc.gnu.org/viewcvs?rev=259772&root=gcc&view=rev
Log:
PR c++/61982 - dead stores to destroyed objects.
gcc/cp/
* call.c (build_trivial_dtor_call): New, assigns a clobber.
(build_over_call, build_special_member_call): Use it.
* cp-tree.h: Declare it.
* init.c (build_delete): Remove trivial path.
gcc/
* gimplify.c (gimplify_modify_expr): Simplify complex lvalue on LHS
of clobber.
Added:
trunk/gcc/testsuite/g++.dg/tree-ssa/lifetime-dse1.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
trunk/gcc/cp/cp-tree.h
trunk/gcc/cp/init.c
trunk/gcc/gimplify.c
>From gcc-bugs-return-603068-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 15:24:00 2018
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Subject: [Bug c++/61982] Optimizer does not eliminate stores to destroyed objects
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #19 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for GCC 9.
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Subject: [Bug c++/85573] gcc 7.3.0 cannot compile recent LLVM for AMD GPU shaders
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--- Comment #5 from Sylvain Bertrand <sylvain.bertrand at gmail dot com> ---
On Mon, Apr 30, 2018 at 01:02:20PM +0000, redi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85573
>
> --- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
> 7.3.1 will never be released, it's a post-7.3.0 and pre-7.4.0 development
> snapshot.
>
> If you are getting segfaults from snapshots now and you don't report them then
> the final release is likely to have the same segfaults.
Then 8.1 release which is supposed to be soon enough. No update on AMD shader
compiler in the mean time.
>From gcc-bugs-return-603071-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 16:01:00 2018
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Subject: [Bug c++/85557] Incorrect calculation of function arguments with C++17 sequencing rules
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--- Comment #4 from Evgeniy Shcherbina <ixsci at yandex dot ru> ---
Jonathan, yes it *should* be called as foo(1, 2) but the result is as if it is
called as foo(1, 1).
--- Comment #5 from Evgeniy Shcherbina <ixsci at yandex dot ru> ---
Jonathan, yes it *should* be called as foo(1, 2) but the result is as if it is
called as foo(1, 1).
>From gcc-bugs-return-603070-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 16:01:00 2018
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Subject: [Bug c++/85557] Incorrect calculation of function arguments with C++17 sequencing rules
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--- Comment #4 from Evgeniy Shcherbina <ixsci at yandex dot ru> ---
Jonathan, yes it *should* be called as foo(1, 2) but the result is as if it is
called as foo(1, 1).
--- Comment #5 from Evgeniy Shcherbina <ixsci at yandex dot ru> ---
Jonathan, yes it *should* be called as foo(1, 2) but the result is as if it is
called as foo(1, 1).
>From gcc-bugs-return-603072-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 16:05:25 2018
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Subject: [Bug c++/85557] Incorrect calculation of function arguments with C++17 sequencing rules
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes that's why I confirmed the bug by changing the status to NEW.
>From gcc-bugs-return-603073-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 16:17:14 2018
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Mon, 30 Apr 2018 16:17:00 -0000
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--- Comment #45 from Andrew Haley <aph at gcc dot gnu.org> ---
(In reply to Davin McCall from comment #44)
> > Well, perhaps not, but this is the language specification.
>
> The "one special guarantee" clause appears in the section describing union
> member access via the "." or "->" operators, implying that it only applies
> to the access of union members via the union.
I don't believe that's what is intended, or that you can make such a
conclusion based on the section in which the rule appears. It applies
to other accesses too, as is (somewhat) made clear by the rationale in
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n685.htm:
The proposed solution is to require that a union declaration be visible
if aliases through a common initial sequence (like the above) are possible.
Therefore the following TU provides this kind of aliasing if desired:
union utag {
struct tag1 { int m1; double d2; } st1;
struct tag2 { int m1; char c2; } st2;
};
int similar_func(struct tag1 *pst2, struct tag2 *pst3) {
pst2->m1 = 2;
pst3->m1 = 0; /* might be an alias for pst2->m1 */
return pst2->m1;
}
I know this is non-normative and not even in the standard, but it does
explain what was intended.
>From gcc-bugs-return-603074-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 16:26:04 2018
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
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--- Comment #46 from James Kuyper Jr. <jameskuyper at alumni dot caltech.edu> ---
(In reply to Andrew Haley from comment #42)
...
> In order to use type-based alias analysis in any LTO framework it's
> necessary to save type information, and this is just more type
> information. ...
Speaking from a developer's perspective rather than an implementor's
perspective, the implementation already needs to keep track of where the
union's completed definition is in scope, because it's only in those locations
where it would be permitted to define an object having the union's type. This
is just a different use for the same information; it shouldn't require storing
any additional information; nor should it require holding on to that
information for any longer than is already required.
As a matter of efficient implementation, rather than correctness, I think it
might be useful to store, for each struct type, a list of the union definitions
for which this might be an issue, a list that would not be needed for any other
reason. However, most of the time, that list would be empty - only when it's
not empty would the compiler need to review that list to determine which other
struct types might be permitted to alias this type, to a limited extent.
> ... The question is, I suppose, how to handle the scopes of
> union declarations. I'd just treat them as being global, which in
> practice isn't unrealistic because such declarations are in header
> files in global scope and shared anyway.
Why not use the actual scope of the completed union declaration, which is what
the relevant rule refers to?
> So, if any union types with a common initial sequence are declared
> anywhere in a program, then their member types alias.
As I understand it, the visibility rule was added specifically for the purpose
of NOT requiring that the entire program be covered by this exception.
Knowledgeable people writing code intended to take advantage of this feature of
C are likely to carefully place completed declarations of the union's type so
they disable those optimizations only where they need to be disabled, and to
minimize the amount of code where this exception would unnecessarily disable
useful optimizations.
>From gcc-bugs-return-603075-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 16:27:33 2018
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Subject: [Bug fortran/85575] Acceptance of invalid code: ordering of declaration statements with implicit typing
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--- Comment #1 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Ok, after discussion on the Intel Forum I found out that this is based on
Section 7.1.11p7 of the f2008 standard , Specification expression:
A variable in a specication expression shall have its type and type
parameters, if any, specified by a previous
declaration in the same scoping unit, by the implicit typing rules in
effect for the scoping unit, or by host or use
association. If a variable in a specification expression is typed by the
implicit typing rules, its appearance in any
subsequent type declaration statement shall confirm the implied type and
type parameters.
But it is not clear whether the compiler actually has to detect this.
>From gcc-bugs-return-603076-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 16:35:39 2018
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
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--- Comment #47 from Andrew Haley <aph at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #43)
> (In reply to Andrew Haley from comment #42)
> >
> > So, if any union types with a common initial sequence are declared
> > anywhere in a program, then their member types alias. Alternatively,
> > a tighter implementation might restrict such declarations to a
> > compilation unit, in which case the alias oracle would scan only the
> > union types declared in that unit.
>
> So for the middle-end the easiest thing would be if the FE would comply
> to its existing semantics and for the initial sequences generate a
> transparent struct. Thus,
>
> union {
> struct A { int i; float f; double z; } a;
> struct B { int i; float f; void *p; } b;
> };
>
> would cause the FE to "implement" struct A and B like
>
> struct __init_seq1 { int i; float f; };
> struct A { struct __init_seq1 _transp_memb1; double z; } a;
> struct B { struct __init_seq1 _transp_memb2; void *p; } b;
>
> then everything would work as expected from an aliasing point of view.
> The difficulty is probably that argument passing of A and B might
> change depending on how the ABIs are defined and how the backend handles
> those wrapping structs.
Nice. I've got to admit that's a clever, idea, but it's also a very
big gotcha.
> But as you can clearly see the above would be also a way for the user
> to get what the clause permits without the clause being present. So
> I'm not sure why this clause was added.
That's somewhat explained by N685, which does contain the rationale.
In short: proposal before N685 was to allow *every* pair of pointers
to structures with a common initial sequence to alias. The revised
version (which was accepted) restricts this to structures with a
common initial sequence where a union of these structures is visible
to the compiler.
> language specifications have defects ...
Yabbut, N685 was accepted and the proposal does explain why. Maybe it
shouldn't have been done that way, but it was done, and it was done
deliberately, as far as I can see.
> > > When I read the language text then a union declaration in between
> > > two accesses will change the semantic of the second?
> >
> > Not necessarily. It would be correct to collect all union
> > declarations at the end of parsing and then use those to feed the
> > alias oracle. There's no actual need to restrict their scope. Sure,
> > it would lead to GCC being somewhat over-cautious, but that's OK.
>
> given the TBAA oracle is filled on-demand it is important that both
> outcomes are allowed.
Okay, I don't get this. Why not simply say that if a union type with
the initial common sequence exists anywhere, it is as though it were
declared at the start of every TU.
> I still don't see how we can make it work easily in the middle-end.
I don't think I ever said it would be easy! I am saying, though, that
it's not the end of TBAA as we know it, but a refinement in which a
front end can feed into the alias oracle sets of types that are known
to alias.
You can think of it as a declaration:
__alias__ {
type_a, type_b, type_c
};
which is an additional input to the oracle.
>From gcc-bugs-return-603077-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 16:46:54 2018
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From: "jameskuyper at alumni dot caltech.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Mon, 30 Apr 2018 16:46:00 -0000
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--- Comment #48 from James Kuyper Jr. <jameskuyper at alumni dot caltech.edu> ---
(In reply to Davin McCall from comment #44)
> > Well, perhaps not, but this is the language specification.
>
> The "one special guarantee" clause appears in the section describing union
> member access via the "." or "->" operators, implying that it only applies
> to the access of union members via the union. ...
I find nothing objectionable about that statement - it is indeed impossible to
create code which relies upon the special guarantee in 6.5.2.3p6 without
accessing the union members via the '.' or '->' operators. However, I believe
that you mean something more restricted than what you're actually saying,
because the code given in the original bug report does in fact access the union
members via '.' operator, in the expressions &u.s1 and &u.s2, to create a
situation where, as I understand it, that special guarantee is fully
applicable.
Could you expand on your description of what you think is required, to make it
clear why it doesn't apply in this case?
>From gcc-bugs-return-603078-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 16:48:41 2018
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From: "aph at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Mon, 30 Apr 2018 16:48:00 -0000
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--- Comment #49 from Andrew Haley <aph at gcc dot gnu.org> ---
(In reply to James Kuyper Jr. from comment #46)
> (In reply to Andrew Haley from comment #42)
> ...
> > In order to use type-based alias analysis in any LTO framework it's
> > necessary to save type information, and this is just more type
> > information. ...
>
> > ... The question is, I suppose, how to handle the scopes of
> > union declarations. I'd just treat them as being global, which in
> > practice isn't unrealistic because such declarations are in header
> > files in global scope and shared anyway.
>
> Why not use the actual scope of the completed union declaration,
> which is what the relevant rule refers to?
The principle of type-based alias analysis is that all you know about
two types is their types, not the location of any code that uses them.
There are no scopes. The oracle, given only the types, has to say
whether they alias or not, regardless of where those types are used in
a program. The location isn't an input to the oracle.
Bear in mind that inlining and other kinds of code motion happen, and
code is often evaluated "outside" the scopes in which it was written
and in a completely different order. That's all perfectly normal
optimization.
Besides, when the alias oracle is consulted, all that scope stuff has
gone. It's only relevant to the front end.
> > So, if any union types with a common initial sequence are declared
> > anywhere in a program, then their member types alias.
>
> As I understand it, the visibility rule was added specifically for
> the purpose of NOT requiring that the entire program be covered by
> this exception.
I don't think so. As I read it, it was a way of declaring to the
compiler that they types are intended to alias.
> Knowledgeable people writing code intended to take advantage of this
> feature of C are likely to carefully place completed declarations of
> the union's type so they disable those optimizations only where they
> need to be disabled, and to minimize the amount of code where this
> exception would unnecessarily disable useful optimizations.
Perhaps so, yes, but in practice it'd be pretty hard to do that.
Functions can only be defined in the other scope, and there's no way
to undefine a union type. I guess you could be clever and put all of
the functions which needed to know about the aliasing at the end of a
translation unit.
>From gcc-bugs-return-603079-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 16:50:31 2018
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Mon, 30 Apr 2018 16:50:00 -0000
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--- Comment #50 from Andrew Haley <aph at gcc dot gnu.org> ---
(In reply to Andrew Haley from comment #49)
>
> Perhaps so, yes, but in practice it'd be pretty hard to do that.
> Functions can only be defined in the other scope,
Should be "the outer scope"
> and there's no way
> to undefine a union type. I guess you could be clever and put all of
> the functions which needed to know about the aliasing at the end of a
> translation unit.
>From gcc-bugs-return-603080-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 17:14:41 2018
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Subject: [Bug target/85572] faster code for absolute value of __v2di
Date: Mon, 30 Apr 2018 17:14:00 -0000
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 44042
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44042&action=edit
gcc8-pr85572.patch
Untested fix.
>From gcc-bugs-return-603081-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 17:22:29 2018
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From: "andrewm.roberts at sky dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug web/85578] New: broken links in gcc-8.0.1-RC-20180427/INSTALL/specific.html, and out of date prerequisites.html
Date: Mon, 30 Apr 2018 17:22:00 -0000
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Bug ID: 85578
Summary: broken links in
gcc-8.0.1-RC-20180427/INSTALL/specific.html, and out
of date prerequisites.html
Product: gcc
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The file INSTALL/specific.html in gcc-8.0.1-RC-20180427
contains many broken links. All links that include target-x-x are broken,
only the simple ones like avr are working.
avr link is:
file:///home/aroberts/gcc/gcc/gcc-8.0.1-RC-20180427/INSTALL/specific.html#avr
which references:
<a name="avr"></a><a name="avr-1"></a>
aarch64*-*-* link is:
file:///home/aroberts/gcc/gcc/gcc-8.0.1-RC-20180427/INSTALL/specific.html#aarch64-x-x
which fails to reference:
<a name="aarch64_002dx_002dx"></a><a
name="aarch64_002a_002d_002a_002d_002a"></a>
This is obviously broken. And seems to apply to all the none trivial links.
Also in prerequisites.html, are the versions for mpc, mpfr, gmp, isl etc ok,
or are they out of date?
I see that the download_prerequisites is referencing:
gmp='gmp-6.1.0.tar.bz2'
mpfr='mpfr-3.1.4.tar.bz2'
mpc='mpc-1.0.3.tar.gz'
isl='isl-0.18.tar.bz2'
>From gcc-bugs-return-603082-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 17:25:12 2018
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From: "jameskuyper at alumni dot caltech.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
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--- Comment #51 from James Kuyper Jr. <jameskuyper at alumni dot caltech.edu> ---
(In reply to Andrew Haley from comment #49)
> (In reply to James Kuyper Jr. from comment #46)
> > (In reply to Andrew Haley from comment #42)
> > ...
> > > In order to use type-based alias analysis in any LTO framework it's
> > > necessary to save type information, and this is just more type
> > > information. ...
> >
> > > ... The question is, I suppose, how to handle the scopes of
> > > union declarations. I'd just treat them as being global, which in
> > > practice isn't unrealistic because such declarations are in header
> > > files in global scope and shared anyway.
> >
> > Why not use the actual scope of the completed union declaration,
> > which is what the relevant rule refers to?
>
> The principle of type-based alias analysis is that all you know about
> two types is their types, not the location of any code that uses them.
> There are no scopes. The oracle, given only the types, has to say
> whether they alias or not, regardless of where those types are used in
> a program. The location isn't an input to the oracle.
>
> Bear in mind that inlining and other kinds of code motion happen, and
> code is often evaluated "outside" the scopes in which it was written
> and in a completely different order. That's all perfectly normal
> optimization.
>
> Besides, when the alias oracle is consulted, all that scope stuff has
> gone. It's only relevant to the front end.
I was only pointing out that implementing this special guarantee where it
applies, and only where it applies, requires keeping information that must
already have been collected. If the current design discards that information
before performing the relevant optimizations, I can understand that this would
require a significant re-design - but the re-design takes the form of saving
information already collected, not of collecting additional information.
> > > So, if any union types with a common initial sequence are declared
> > > anywhere in a program, then their member types alias.
> >
> > As I understand it, the visibility rule was added specifically for
> > the purpose of NOT requiring that the entire program be covered by
> > this exception.
>
> I don't think so. As I read it, it was a way of declaring to the
> compiler that they types are intended to alias.
By "the visibility rule", I mean, very specifically, the phrase "anywhere that
a declaration of the completed type of the union is visible". If the intent had
been to disable aliasing throughout the entire program, that intent could have
been expressed by simply removing those words entirely; if there was any doubt
that people would understand the absence of those words correctly, then they
could have been replaced with the phrase "anywhere, regardless of whether or
not the completed type of the union was visible". I don't see any plausible
reason for the committee to write "anywhere that a declaration of the completed
type of the union is visible", unless that phrase was intended to restrict
applicability of the special guarantee.
> > Knowledgeable people writing code intended to take advantage of this
> > feature of C are likely to carefully place completed declarations of
> > the union's type so they disable those optimizations only where they
> > need to be disabled, and to minimize the amount of code where this
> > exception would unnecessarily disable useful optimizations.
>
> Perhaps so, yes, but in practice it'd be pretty hard to do that.
> Functions can only be defined in the other scope, and there's no way
> to undefine a union type.
True, but failing to define the union type is quite trivial. If I were writing
code that used both struct types, but not the union type, and did nothing that
relied upon the fact that they can alias each other, I would simply not
#include the header that defines the completed union type, #including only the
header that defines the struct types. If I needed to put such code in the same
translation unit as code which actually needs the union declaration, I would
put the code that doesn't need it before the #include, and put the code that
does need it after the #include - but that would probably be more trouble than
it's worth.
>From gcc-bugs-return-603083-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 17:27:20 2018
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Subject: [Bug fortran/85575] Acceptance of invalid code: ordering of declaration statements with implicit typing
Date: Mon, 30 Apr 2018 17:27:00 -0000
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kargl at gcc dot gnu.org
--- Comment #2 from kargl at gcc dot gnu.org ---
(In reply to Jürgen Reuter from comment #1)
> Ok, after discussion on the Intel Forum I found out that this is based on
> Section 7.1.11p7 of the f2008 standard , Specification expression:
>
> A variable in a specication expression shall have its type and type
> parameters, if any, specified by a previous
> declaration in the same scoping unit, by the implicit typing rules in
> effect for the scoping unit, or by host or use
> association. If a variable in a specification expression is typed by the
> implicit typing rules, its appearance in any
> subsequent type declaration statement shall confirm the implied type and
> type parameters.
>
> But it is not clear whether the compiler actually has to detect this.
If it is a numbered constraint, then the compiler must detect the problem.
If it is unnumbered, then the above "shall"'s apply to the program(mer).
A compiler can, but is not required to report a problem.
>From gcc-bugs-return-603084-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 17:31:13 2018
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Subject: [Bug c++/85305] Parameter pack expression in lambda capture list fails as part of a fold expression
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>From gcc-bugs-return-603085-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 17:32:51 2018
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/85574] [9 Regression] LTO bootstapped binaries differ
Date: Mon, 30 Apr 2018 17:32:00 -0000
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--- Comment #2 from rguenther at suse dot de <rguenther at suse dot de> ---
On April 30, 2018 5:01:30 PM GMT+02:00, "hubicka at gcc dot gnu.org"
<gcc-bugzilla@gcc.gnu.org> wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85574
>
>Jan Hubicka <hubicka at gcc dot gnu.org> changed:
>
> What |Removed |Added
>----------------------------------------------------------------------------
> CC| |hubicka at gcc dot gnu.org
>
>--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
>Attachement seems to be missing. How do I reproduce it?
You reproduce w/o attachment, just LTO bootstrap up to comparison stage and
then cmp cc1 or gengtype. Works fine on the branch, miscompares on trunk.
>The partitioning changes are not really affecting any sorting. The
>changes
>will be null with -flto-partitioning=<anything except for ballanced>
>From gcc-bugs-return-603086-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 17:36:55 2018
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Subject: [Bug go/85429] Several gotools tests FAIL with Solaris as
Date: Mon, 30 Apr 2018 17:36:00 -0000
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--- Comment #9 from Ian Lance Taylor <ian at airs dot com> ---
I suppose if worst comes to worst we can try it both ways.
>From gcc-bugs-return-603087-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 17:41:31 2018
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Subject: [Bug c++/85039] [6/7 Regression] internal compiler error: in nested_anon_class_index, at cp/mangle.c:1626
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|6.5 |8.0
--- Comment #7 from Jason Merrill <jason at gcc dot gnu.org> ---
Closing; we generally don't backport fixes for invalid code.
>From gcc-bugs-return-603088-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 17:44:49 2018
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Subject: [Bug c++/58063] default arguments evaluated twice per call
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Known to work| |4.9.4, 5.2.0, 6.0
Resolution|--- |FIXED
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--- Comment #17 from Jason Merrill <jason at gcc dot gnu.org> ---
This was fixed a while back.
>From gcc-bugs-return-603089-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 18:24:51 2018
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Subject: [Bug c++/84701] casting to ( unsigned typeof(variable) ) gives wrong results
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>From gcc-bugs-return-603090-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 18:29:03 2018
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From: "seurer at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85579] New: [9 regression] SIGSEV in fortran test case gfortran.dg/pr51434.f90 starting with r259754
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Bug ID: 85579
Summary: [9 regression] SIGSEV in fortran test case
gfortran.dg/pr51434.f90 starting with r259754
Product: gcc
Version: 8.0
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Sorry, I don't know enough about fortran to know whether there is something
wrong with the test case.
seurer@makalu-lp1:~/gcc/build/gcc-test2$
/home/seurer/gcc/build/gcc-test2/gcc/testsuite/gfortran/../../gfortran
-B/home/seurer/gcc/build/gcc-test2/gcc/testsuite/gfortran/../../
-B/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libgfortran/
/home/seurer/gcc/gcc-test2/gcc/testsuite/gfortran.dg/pr51434.f90
-fno-diagnostics-show-caret -fdiagnostics-color=never -O1 -pedantic-errors
-B/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libgfortran/.libs
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libgfortran/.libs
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libgfortran/.libs
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libatomic/.libs
-B/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libquadmath/.libs
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libquadmath/.libs
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libquadmath/.libs
-lm -g3 -o ./pr51434.exe
seurer@makalu-lp1:~/gcc/build/gcc-test2$ gdb ./pr51434.exe
(gdb) run
Starting program: /home/seurer/gcc/build/gcc-test2/./pr51434.exe
Program received signal SIGSEGV, Segmentation fault.
0x0000000010000770 in bar () at
/home/seurer/gcc/gcc-test2/gcc/testsuite/gfortran.dg/pr51434.f90:18
18 if (any(c%t /= ['a', 'b', 'c', 'd', 'e'])) stop 2
Missing separate debuginfos, use: debuginfo-install
glibc-2.17-196.el7_4.2.ppc64 zlib-1.2.7-17.el7.ppc64
(gdb) where
#0 0x0000000010000770 in bar () at
/home/seurer/gcc/gcc-test2/gcc/testsuite/gfortran.dg/pr51434.f90:18
#1 main (argc=<optimized out>, argv=<optimized out>) at
/home/seurer/gcc/gcc-test2/gcc/testsuite/gfortran.dg/pr51434.f90:14
#2 0x00003fffb7a36bec in .generic_start_main.isra.0 () from /lib64/libc.so.6
#3 0x00003fffb7a36e14 in .__libc_start_main () from /lib64/libc.so.6
#4 0x0000000000000000 in ?? ()
>From gcc-bugs-return-603091-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 18:30:43 2018
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Subject: [Bug tree-optimization/85579] [9 regression] SIGSEV in fortran test case gfortran.dg/pr51434.f90 starting with r259754
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seurer at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |powerpc64*-*-*
CC| |rguenth at gcc dot gnu.org,
| |wschmidt at gcc dot gnu.org
Host| |powerpc64*-*-*
Build| |powerpc64*-*-*
--- Comment #1 from seurer at gcc dot gnu.org ---
This occurs on powerpc64 both LE and BE.
>From gcc-bugs-return-603092-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 18:56:46 2018
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From: "davmac at davmac dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Mon, 30 Apr 2018 18:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65892
--- Comment #52 from Davin McCall <davmac at davmac dot org> ---
(In reply to James Kuyper Jr. from comment #48)
> > The "one special guarantee" clause appears in the section describing union
> > member access via the "." or "->" operators, implying that it only applies
> > to the access of union members via the union. ...
>
> I find nothing objectionable about that statement - it is indeed impossible
> to create code which relies upon the special guarantee in 6.5.2.3p6 without
> accessing the union members via the '.' or '->' operators. However, I
> believe that you mean something more restricted than what you're actually
> saying, because the code given in the original bug report does in fact
> access the union members via '.' operator, in the expressions &u.s1 and
> &u.s2, to create a situation where, as I understand it, that special
> guarantee is fully applicable.
> Could you expand on your description of what you think is required, to make
> it clear why it doesn't apply in this case?
It isn't clear that "&u.s1" for example actually accesses either "u" or its
member "s1", and I would argue that it doesn't for either. I read it how (if I
understand correctly) GCC has up until now interpreted it: the "special
guarantee" is for expressions directly involving member access via the union.
Once you take the address of the member, and later dereference it via "*", you
are dealing with a different operator and the guarantee doesn't apply.
I'll admit that this is still making some assumptions, but it's an
interpretation that is far more at peace with the rest of the standard.
(In reply to Andrew Haley from comment #45)
> (In reply to Davin McCall from comment #44)
> > The "one special guarantee" clause appears in the section describing union
> > member access via the "." or "->" operators, implying that it only applies
> > to the access of union members via the union.
>
> I don't believe that's what is intended, or that you can make such a
> conclusion based on the section in which the rule appears. It applies
> to other accesses too, as is (somewhat) made clear by the rationale in
> http://www.open-std.org/jtc1/sc22/wg14/www/docs/n685.htm:
It certainly may not be what is intended by N685, but I think it's normally
reasonable to conclude that a statement in a particular section of a document
applies to that section and not more universally than that; in this case, the
"universal" interpretation flatly contradicts the strict aliasing rule and any
other rule which would otherwise disallow access, which seems extremely
problematic to me.
In general it appears the committee have asserted that the "universal"
interpretation (which since N685 requires visibility of the union declaration
to be effective) is the correct one, but my argument is that the actual text of
the standard strongly implies something different, and that the interpretation
being pushed instead turns another portion of the standard text into nonsense.
It's extremely problematic in my view that a more reasonable reading is
considered incorrect and that this can only be known with external knowledge
outside the text of the specification itself.
Never the less, I take your point.
>From gcc-bugs-return-603093-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 19:29:56 2018
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From: "jameskuyper at alumni dot caltech.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Mon, 30 Apr 2018 19:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65892
--- Comment #53 from James Kuyper Jr. <jameskuyper at alumni dot caltech.edu> ---
(In reply to Davin McCall from comment #52)
> (In reply to James Kuyper Jr. from comment #48)
> > > The "one special guarantee" clause appears in the section describing union
> > > member access via the "." or "->" operators, implying that it only applies
> > > to the access of union members via the union. ...
> >
> > I find nothing objectionable about that statement - it is indeed impossible
> > to create code which relies upon the special guarantee in 6.5.2.3p6 without
> > accessing the union members via the '.' or '->' operators. However, I
> > believe that you mean something more restricted than what you're actually
> > saying, because the code given in the original bug report does in fact
> > access the union members via '.' operator, in the expressions &u.s1 and
> > &u.s2, to create a situation where, as I understand it, that special
> > guarantee is fully applicable.
> > Could you expand on your description of what you think is required, to make
> > it clear why it doesn't apply in this case?
>
> It isn't clear that "&u.s1" for example actually accesses either "u" or its
> member "s1", and I would argue that it doesn't for either.
I agree: that expression does not access u or s1. However, because those
pointers are passed to f(), which does dereference them, f() does accesses
those members, and it does so via the use of the '.' operator in the calling
routine. Therefore, you need, at a minimum, to modify "accesses via" to
"accesses directly via", in order to convey your intended meaning.
I don't see anything in the standard's wording of 6.5.2.3p6 to justify
restricting what it says to direct accesses - it says "it is permitted to
inspect", without specifying restrictions on how the inspection may be
performed.
The words "anywhere that a declaration of the completed type of the union
is visible." would become pointless with your interpretation. You already need
a visible complete declaration of the union to directly access it's members
without violating a constraint. Those words are only needed if the guarantee
was intended to apply even when the access is not direct.
>From gcc-bugs-return-603094-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 19:51:51 2018
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From: "emsr at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/68397] std::tr1::expint fails in __expint_En_cont_frac for some long double arguments due to low __max_iter value
Date: Mon, 30 Apr 2018 19:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68397
--- Comment #6 from emsr at gcc dot gnu.org ---
Author: emsr
Date: Mon Apr 30 19:51:13 2018
New Revision: 259777
URL: https://gcc.gnu.org/viewcvs?rev=259777&root=gcc&view=rev
Log:
2018-04-30 Edward Smith-Rowland <3dw4rd@verizon.net>
PR libstdc++/pr66689 - comp_ellint_3 and ellint_3 return garbage values
* include/tr1/ell_integral.tcc: Correct the nu sign convention
in ellint_3 and comp_ellint_3.
* testsuite/tr1/5_numerical_facilities/special_functions/
06_comp_ellint_3/check_value.cc: Regen with correct values.
* testsuite/tr1/5_numerical_facilities/special_functions/
14_ellint_3/check_value.cc: Ditto.
* testsuite/special_functions/06_comp_ellint_3/check_value.cc: Ditto.
* testsuite/special_functions/13_ellint_3/check_value.cc: Ditto.
* testsuite/special_functions/06_comp_ellint_3/pr66689.cc: New.
* testsuite/special_functions/13_ellint_3/pr66689.cc: New.
* testsuite/tr1/5_numerical_facilities/special_functions/
06_comp_ellint_3/pr66689.cc: New.
* testsuite/tr1/5_numerical_facilities/special_functions/
14_ellint_3/pr66689.cc: New.
2018-04-30 Edward Smith-Rowland <3dw4rd@verizon.net>
PR libstdc++/68397 std::tr1::expint fails ... long double arguments.
* include/tr1/exp_integral.tcc: Increase iteration limits.
* testsuite/tr1/5_numerical_facilities/special_functions/15_expint/
pr68397.cc: New test.
* testsuite/special_functions/14_expint/pr68397.cc: New test.
svn commit \ --This line, and those below, will be ignored--
ChangeLog \ M ChangeLog M include/tr1/ell_integral.tcc A
testsuite/special_functions/06_comp_ellint_3/pr66689.cc A
testsuite/special_functions/13_ellint_3/pr66689.cc A
testsuite/tr1/5_numerical_facilities/special_functions/06_comp_ellint_3/pr66689.cc
A
testsuite/tr1/5_numerical_facilities/special_functions/14_ellint_3/pr66689.cc M
testsuite/special_functions/06_comp_ellint_3/check_value.cc M
testsuite/special_functions/13_ellint_3/check_value.cc M
testsuite/tr1/5_numerical_facilities/special_functions/06_comp_ellint_3/check_value.cc
M
testsuite/tr1/5_numerical_facilities/special_functions/14_ellint_3/check_value.cc
M include/tr1/exp_integral.tcc A
testsuite/special_functions/14_expint/pr68397.cc A
testsuite/tr1/5_numerical_facilities/special_functions/15_expint/pr68397.cc
include/tr1/ell_integral.tcc \
testsuite/special_functions/06_comp_ellint_3/pr66689.cc \
testsuite/special_functions/13_ellint_3/pr66689.cc \
testsuite/tr1/5_numerical_facilities/special_functions/06_comp_ellint_3/pr66689.cc
\
testsuite/tr1/5_numerical_facilities/special_functions/14_ellint_3/pr66689.cc
\
testsuite/special_functions/06_comp_ellint_3/check_value.cc \
testsuite/special_functions/13_ellint_3/check_value.cc \
testsuite/tr1/5_numerical_facilities/special_functions/06_comp_ellint_3/check_value.cc
\
testsuite/tr1/5_numerical_facilities/special_functio
Added:
branches/gcc-7-branch/libstdc++-v3/testsuite/special_functions/06_comp_ellint_3/pr66689.cc
branches/gcc-7-branch/libstdc++-v3/testsuite/special_functions/13_ellint_3/pr66689.cc
branches/gcc-7-branch/libstdc++-v3/testsuite/special_functions/14_expint/pr68397.cc
branches/gcc-7-branch/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/06_comp_ellint_3/pr66689.cc
branches/gcc-7-branch/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/14_ellint_3/pr66689.cc
branches/gcc-7-branch/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/15_expint/pr68397.cc
Modified:
branches/gcc-7-branch/libstdc++-v3/ChangeLog
branches/gcc-7-branch/libstdc++-v3/include/tr1/ell_integral.tcc
branches/gcc-7-branch/libstdc++-v3/include/tr1/exp_integral.tcc
branches/gcc-7-branch/libstdc++-v3/testsuite/special_functions/06_comp_ellint_3/check_value.cc
branches/gcc-7-branch/libstdc++-v3/testsuite/special_functions/13_ellint_3/check_value.cc
branches/gcc-7-branch/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/06_comp_ellint_3/check_value.cc
branches/gcc-7-branch/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/14_ellint_3/check_value.cc
>From gcc-bugs-return-603095-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 19:55:03 2018
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From: "freddie_chopin at op dot pl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85580] New: "conflicting C language linkage declaration" warning for variables with identical names in `extern "C"` functions
Date: Mon, 30 Apr 2018 19:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85580
Bug ID: 85580
Summary: "conflicting C language linkage declaration" warning
for variables with identical names in `extern "C"`
functions
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Reporter: freddie_chopin at op dot pl
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Here's a minimal test case executed with 8.0.1-RC-20180427 (compiled for
arm-none-eabi target, but I think the problem is not target-specific):
-- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 --
$ cat test.cpp
extern "C"
{
void f1()
{
union some_type{
char a[2];
int b;
} variable;
}
void f2()
{
union some_type{
char a[2];
int b;
} variable;
}
}
$ arm-none-eabi-gcc test.cpp -c
test.cpp: In function 'void f2()':
test.cpp:17:5: warning: conflicting C language linkage declaration
'f2()::some_type variable'
} variable;
^~~~~~~~
test.cpp:9:5: note: previous declaration 'f1()::some_type variable'
} variable;
^~~~~~~~
$ arm-none-eabi-gcc --version
arm-none-eabi-gcc (bleeding-edge-toolchain) 8.0.1 20180427 (prerelease)
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.
-- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 --
For the problem to appear:
- functions with the types and variables have to be extern "C"
- the file must be C++
- there has to be both a type and a variable
- the variables must have identical names
The problem was spotted with ARM CMSIS headers, where similar pattern exists:
https://github.com/ARM-software/CMSIS_5/blob/develop/CMSIS/Core/Include/cmsis_gcc.h#L1929
Related discussion on mailing list:
https://gcc.gnu.org/ml/gcc/2018-04/msg00191.html
>From gcc-bugs-return-603096-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 20:23:12 2018
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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++/85580] [8/9 Regression] "conflicting C language linkage declaration" warning for variables with identical names in `extern "C"` functions
Date: Mon, 30 Apr 2018 20:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85580
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-30
CC| |jakub at gcc dot gnu.org,
| |nathan at gcc dot gnu.org
Target Milestone|--- |8.0
Summary|"conflicting C language |[8/9 Regression]
|linkage declaration" |"conflicting C language
|warning for variables with |linkage declaration"
|identical names in `extern |warning for variables with
|"C"` functions |identical names in `extern
| |"C"` functions
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r253622.
>From gcc-bugs-return-603098-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 30 21:22:09 2018
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Subject: [Bug c++/84701] casting to ( unsigned typeof(variable) ) gives wrong results
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84701
--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Mon Apr 30 21:21:32 2018
New Revision: 259780
URL: https://gcc.gnu.org/viewcvs?rev=259780&root=gcc&view=rev
Log:
PR c++/84701 - unsigned typeof.
* decl.c (grokdeclarator): Overhaul diagnostics for invalid use
of long/short/signed/unsigned.
Added:
trunk/gcc/testsuite/g++.dg/ext/typeof13.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/decl.c
trunk/gcc/testsuite/g++.dg/cpp1z/decomp3.C
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Subject: [Bug c++/85305] Parameter pack expression in lambda capture list fails as part of a fold expression
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--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Mon Apr 30 21:21:25 2018
New Revision: 259779
URL: https://gcc.gnu.org/viewcvs?rev=259779&root=gcc&view=rev
Log:
PR c++/85305 - pack in lambda init-capture.
* parser.c (cp_parser_initializer): Add subexpression_p parm; don't
check_for_bare_parameter_packs in a subexpression.
(cp_parser_lambda_introducer): Use it.
Added:
trunk/gcc/testsuite/g++.dg/cpp1z/fold-lambda2.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
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Subject: [Bug c++/85305] Parameter pack expression in lambda capture list fails as part of a fold expression
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |9.0
--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed on trunk so far.
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Subject: [Bug c++/85305] Parameter pack expression in lambda capture list fails as part of a fold expression
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug c++/84701] casting to ( unsigned typeof(variable) ) gives wrong results
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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Target Milestone|--- |9.0
--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for GCC 9.
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Subject: [Bug c++/85580] [8/9 Regression] "conflicting C language linkage declaration" warning for variables with identical names in `extern "C"` functions
Date: Mon, 30 Apr 2018 21:34:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |jason at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |jason at gcc dot gnu.org
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Subject: [Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores
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Bug 77485 depends on bug 33562, which changed state.
Bug 33562 Summary: [6 Regression] aggregate DSE disabled
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=33562
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----------------------------------------------------------------------------
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Subject: [Bug tree-optimization/33562] [6 Regression] aggregate DSE disabled
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Jeffrey A. Law <law at redhat dot com> changed:
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--- Comment #35 from Jeffrey A. Law <law at redhat dot com> ---
We're not going to backport this any of the release branches.
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Subject: [Bug fortran/85581] New: implied DO not initializing array as expected
Date: Tue, 01 May 2018 00:07:00 -0000
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Bug ID: 85581
Summary: implied DO not initializing array as expected
Product: gcc
Version: 6.4.0
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I expect the two functions to be equivalent, but returnarrB acts like
(char(64+isize),I=1,isize) instead of (char(64+i),I=1,isize) was specified???
program uuidgen
implicit none
character(len=:),allocatable :: methods(:)
methods=[returnarrA(26),returnarrA(5)]
write(*,'(*("[",a,"]":,","))')methods
methods=[returnarrB(26),returnarrB(5)]
write(*,'(*("[",a,"]":,","))')methods
contains
function returnarrA(isize) result(arr)
integer,intent(in) :: isize
character(len=1),allocatable :: arr(:) !<== len=1
integer :: i
arr=[character(len=1) ::(char(64+i),i=1,isize)]
end function returnarrA
function returnarrB(isize) result(arr)
integer,intent(in) :: isize
character(len=:),allocatable :: arr(:) !<== len=:
integer :: i
arr=[character(len=1) ::(char(64+i),i=1,isize)]
end function returnarrB
end program uuidgen
Output
[A],[B],[C],[D],[E],[F],[G],[H],[I],[J],[K],[L],[M],[N],[O],[P],[Q],[R],[S],[T],[U],[V],[W],[X],[Y],[Z],[A],[B],[C],[D],[E]
[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[Z],[E],[E],[E],[E],[E]
Expecting returnarrA() and returnarrB() functions to return the same results.
That is, I expect
[A],[B],[C],[D],[E],[F],[G],[H],[I],[J],[K],[L],[M],[N],[O],[P],[Q],[R],[S],[T],[U],[V],[W],[X],[Y],[Z],[A],[B],[C],[D],[E]
[A],[B],[C],[D],[E],[F],[G],[H],[I],[J],[K],[L],[M],[N],[O],[P],[Q],[R],[S],[T],[U],[V],[W],[X],[Y],[Z],[A],[B],[C],[D],[E]
~
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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++/85523] Add fix-it hint for missing return statement in assignment operators
Date: Tue, 01 May 2018 00:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85523
--- Comment #5 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Author: dmalcolm
Date: Tue May 1 00:10:10 2018
New Revision: 259783
URL: https://gcc.gnu.org/viewcvs?rev=259783&root=gcc&view=rev
Log:
Add gcc_rich_location::add_fixit_insert_formatted
This patch adds a support function to class gcc_rich_location
to make it easier for fix-it hints to use idiomatic C/C++
indentation, for use by the patch for PR c++/85523.
gcc/ChangeLog:
PR c++/85523
* gcc-rich-location.c (blank_line_before_p): New function.
(use_new_line): New function.
(gcc_rich_location::add_fixit_insert_formatted): New function.
* gcc-rich-location.h
(gcc_rich_location::add_fixit_insert_formatted): New function.
gcc/testsuite/ChangeLog:
PR c++/85523
* gcc.dg/plugin/diagnostic-test-show-locus-generate-patch.c
(test_add_fixit_insert_formatted_single_line): New function.
(test_add_fixit_insert_formatted_multiline): New function.
Extend expected output of generated patch to include fix-it hints
for these.
* gcc.dg/plugin/diagnostic_plugin_test_show_locus.c: Include
"gcc-rich-location.h". Add test coverage for
gcc_rich_location::add_fixit_insert_formatted.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/gcc-rich-location.c
trunk/gcc/gcc-rich-location.h
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/plugin/diagnostic-test-show-locus-generate-patch.c
trunk/gcc/testsuite/gcc.dg/plugin/diagnostic_plugin_test_show_locus.c
>From gcc-bugs-return-603107-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 00:23:54 2018
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Subject: [Bug c++/85523] Add fix-it hint for missing return statement in assignment operators
Date: Tue, 01 May 2018 00:23:00 -0000
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--- Comment #6 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Candidate patch:
https://gcc.gnu.org/ml/gcc-patches/2018-05/msg00001.html
>From gcc-bugs-return-603108-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 00:32:04 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/69968] RFC: Use Damerau-Levenshtein within spellcheck.c, rather than Levenshtein
Date: Tue, 01 May 2018 00:32:00 -0000
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |dmalcolm at gcc dot gnu.org
--- Comment #4 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Candidate patch:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85523
>From gcc-bugs-return-603109-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 02:16:10 2018
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From: "davmac at davmac dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Tue, 01 May 2018 02:16:00 -0000
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--- Comment #54 from Davin McCall <davmac at davmac dot org> ---
(In reply to James Kuyper Jr. from comment #53)
> [...] However, because those
> pointers are passed to f(), which does dereference them, f() does accesses
> those members, and it does so via the use of the '.' operator in the calling
> routine. Therefore, you need, at a minimum, to modify "accesses via" to
> "accesses directly via", in order to convey your intended meaning.
I thought it was clear that I was referring to access via the union. That is
certainly what I did mean.
>
> I don't see anything in the standard's wording of 6.5.2.3p6 to justify
> restricting what it says to direct accesses - it says "it is permitted to
> inspect", without specifying restrictions on how the inspection may be
> performed.
As I have said, it is in a section regarding access and in a paragraph
discussing "use of unions". While I understand what you are saying, I don't
feel my own interpretation is really that difficult to fathom, and I'm not the
only one to take it. See http://archive.is/PnW28 (DR 257).
> The words "anywhere that a declaration of the completed type of the union
> is visible." would become pointless with your interpretation.
Yes, as I already said.
>From gcc-bugs-return-603110-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 03:06:39 2018
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Subject: [Bug fortran/85547] Run-time error: character array constructor
Date: Tue, 01 May 2018 03:06:00 -0000
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--- Comment #5 from Walter Spector <w6ws at earthlink dot net> ---
Turns out my third case, in comment #2, is incorrect. To correct it, line 5
should read:
path = (/ 'xyz/' /)
With this correction, my current trunk snapshot works ok. (Doesn't apply to
the first two examples though.)
>From gcc-bugs-return-603111-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 03:09:08 2018
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From: "jameskuyper at alumni dot caltech.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Tue, 01 May 2018 03:09:00 -0000
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--- Comment #55 from James Kuyper Jr. <jameskuyper at alumni dot caltech.edu> ---
> ou need, at a minimum, to modify "accesses via" to
> "accesses directly via", in order to convey your intended meaning.
(In reply to Davin McCall from comment #54)
> (In reply to James Kuyper Jr. from comment #53)
> > [...] However, because those
> > pointers are passed to f(), which does dereference them, f() does accesses
> > those members, and it does so via the use of the '.' operator in the calling
> > routine. Therefore, you need, at a minimum, to modify "accesses via" to
> > "accesses directly via", in order to convey your intended meaning.
>
> I thought it was clear that I was referring to access via the union. That is
> certainly what I did mean.
The problem is, you're using a statement that the access must occur via a
union, with the implication that the code in question does not access the
member through the union. The code in the original bug report does in fact
access the members through the union - indirectly, but through the union. It's
not possible to bypass the u.s1 step; the fact that u.s1 is the operand of an &
operator and the resulting pointer value is an argument to a function call, and
that the called function is the one that actually accesses the member through
that pointer, does not change the fact that the access came about as the result
of the use of the '.' operator on a union object. Therefore, if you want your
wording to convey your belief that such indirect use of the member selection
operator is excluded, your wording needs modification to make that clear. Of
course, if so modified, it would be saying something with no actual support in
the C standard.
> > I don't see anything in the standard's wording of 6.5.2.3p6 to justify
> > restricting what it says to direct accesses - it says "it is permitted to
> > inspect", without specifying restrictions on how the inspection may be
> > performed.
>
> As I have said, it is in a section regarding access and in a paragraph
> discussing "use of unions". While I understand what you are saying, I don't
> feel my own interpretation is really that difficult to fathom, and I'm not
> the only one to take it. See http://archive.is/PnW28 (DR 257).
True, but keep in mind that the committee did not agree with his objections.
The example he was complaining about is still present in the current version of
the standard, without any changes that address the issues he raised (I happen
to agree with him that it would have been better to use a common initial
sequence with a length greater than one member, and to use a member other than
the first one for the example).
> > The words "anywhere that a declaration of the completed type of the union
> > is visible." would become pointless with your interpretation.
>
> Yes, as I already said.
The standard explicitly says, referring to the same example mentioned in DR
257, that the second code fragment is not valid, but only "because the union
type is not visible within function f", implying that it would be valid if the
declaration of the union type were moved so that it would be visible inside
f(). If it were so moved, it would be essentially equivalent to the code which
was the original defect report. While examples are non-normative, that example
implies that the visibility clause was intended to actually serve a purpose
(and it seems obvious to me that it actually does so).
>From gcc-bugs-return-603112-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 03:55:47 2018
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From: "peter at cordes dot ca" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/81274] x86 optimizer emits unnecessary LEA instruction when using AVX intrinsics
Date: Tue, 01 May 2018 03:55:00 -0000
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--- Comment #2 from Peter Cordes <peter at cordes dot ca> ---
The stray LEA bug seems to be fixed in current trunk (9.0.0 20180429), at least
for this testcase. Gcc's stack-alignment strategy seems to be improved overall
(not copying the return address when not needed), so probably it's really
fixed.
It's still present in 7.3.
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Subject: [Bug tree-optimization/85582] New: wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85582
Bug ID: 85582
Summary: wrong code at -O1 and above on x86_64-linux-gnu in
32-bit mode
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
$ 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 20180501 (experimental) [trunk revision 259787] (GCC)
$
$ gcctk -m32 -O0 small.c; ./a.out
$
$ gcctk -m32 -O1 small.c
$ ./a.out
Floating point exception (core dumped)
$
---------------------------------
int a, b, d = 2, e;
long long c = 1;
int main ()
{
int g = 6;
L1:
e = d;
if (a)
goto L1;
g--;
int i = c >> ~(~e | ~g);
L2:
c = (b % c) * i;
if (!e)
goto L2;
return 0;
}
>From gcc-bugs-return-603114-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 10:05:21 2018
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From: "ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug go/85429] Several gotools tests FAIL with Solaris as
Date: Tue, 01 May 2018 10:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85429
--- Comment #10 from Rainer Orth <ro at gcc dot gnu.org> ---
Created attachment 44043
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44043&action=edit
proposed patch
Here's what I came up with: tested on i386-pc-solaris2.11 and
sparc-sun-solaris2.11,
both with as and gas. All exclude-related gotools failures are gone.
>From gcc-bugs-return-603115-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 10:11:09 2018
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Subject: [Bug target/85582] [9 Regression] wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85582
Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86-*-*
Status|UNCONFIRMED |NEW
Version|unknown |9.0
Keywords| |wrong-code
Last reconfirmed| |2018-05-01
Component|tree-optimization |target
Ever confirmed|0 |1
Summary|wrong code at -O1 and above |[9 Regression] wrong code
|on x86_64-linux-gnu in |at -O1 and above on
|32-bit mode |x86_64-linux-gnu in 32-bit
| |mode
Target Milestone|--- |9.0
--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
Possibly due to the recent patch on masked shifts.
>From gcc-bugs-return-603116-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 10:16:38 2018
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Subject: [Bug fortran/85581] implied DO not initializing array as expected
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
AFAICT this has been fixed for 8.0.1 and trunk (9.0), my guess is revision
r255294.
>From gcc-bugs-return-603117-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 10:22:33 2018
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Subject: [Bug lto/85583] New: lto1: internal compiler error: in lto_balanced_map, at lto/lto-partition.c:833
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Bug ID: 85583
Summary: lto1: internal compiler error: in lto_balanced_map, at
lto/lto-partition.c:833
Product: gcc
Version: 9.0
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Created attachment 44044
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44044&action=edit
preprocessed unreduced source
gcc-9 r259787:
# g++ -O1 -flto Hello.cpp
lto1: internal compiler error: in lto_balanced_map, at lto/lto-partition.c:833
Hello.cpp is taken from LLVM: lib/Transforms/Hello/Hello.cpp
No issues with lto/7.3.1
>From gcc-bugs-return-603118-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 10:37:06 2018
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Subject: [Bug web/85578] broken links in gcc-8.0.1-RC-20180427/INSTALL/specific.html, and out of date prerequisites.html
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |http://gcc.gnu.org/ml/gcc-p
| |atches/2018-05/msg00004.htm
| |l
CC| |jakub at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Patch for the anchors: http://gcc.gnu.org/ml/gcc-patches/2018-05/msg00004.html
I don't see anything wrong with the prerequisites, the documentation lists the
minimum supported versions, download_prerequisites downloads the recommended
versions.
>From gcc-bugs-return-603119-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 10:40:34 2018
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Subject: [Bug target/85582] [9 Regression] wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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| |uros at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r259739.
>From gcc-bugs-return-603120-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 10:47:12 2018
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Subject: [Bug web/85578] broken links in gcc-8.0.1-RC-20180427/INSTALL/specific.html, and out of date prerequisites.html
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--- Comment #2 from Andrew Roberts <andrewm.roberts at sky dot com> ---
Ok thanks, just checking on the prerequisites front.
>From gcc-bugs-return-603121-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 11:00:51 2018
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85584] New: [og7, nvptx] make generic and per-worker broadcast buffers overlap
Date: Tue, 01 May 2018 11:00:00 -0000
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Bug ID: 85584
Summary: [og7, nvptx] make generic and per-worker broadcast
buffers overlap
Product: gcc
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Consider this fortran testcase compiled at -O2 with
-foffload=-mlong-vector-in-workers:
...
module param
integer, parameter :: N = 32
end module param
program main
use param
integer :: i, j
integer :: a(N)
do i = 1, N
a(i) = i
end do
!$acc parallel copy (a) vector_length (128)
!$acc loop worker
do i = 1, N
!$acc loop vector
do j = j, N
a(j) = a(j) - a(j)
end do
end do
!$acc end parallel
do i = 1, N
if (a(i) .ne. 0) call abort
end do
end program main
...
In the ptx, we generate a broadcast buffer:
...
.shared .align 8 .u8 __oacc_bcast[504];
...
which consists of 9 partitions of 56. 1 generic partition, and 8 per-worker
partitions.
The generic partition is addressed using __oacc_bcast, the per-worker
partitions are addressed using %r109 calculated here:
...
{
.reg .u32 %tidy;
.reg .u64 %t_bcast;
.reg .u64 %y64;
mov.u32 %tidy,%tid.y;
cvt.u64.u32 %y64,%tidy;
add.u64 %y64,%y64,1;
cvta.shared.u64 %t_bcast,__oacc_bcast;
mad.lo.u64 %r109,%y64,56,%t_bcast;
}
...
The generic partition broadcasting is guarded with bar.sync 0, the per-worker
partition broadcasting is guarded with bar.sync %r110,128, where %r110 is
calculated here:
...
{
.reg .u32 %tidy;
mov.u32 %tidy,%tid.y;
add.u32 %r110,%tidy,1;
}
...
In principle, it should be possible to make the generic partition overlap with
the per-worker partitions, which would mean less shared memory used.
>From gcc-bugs-return-603122-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 11:16:44 2018
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Subject: [Bug target/85584] [og7, nvptx] make generic and per-worker broadcast buffers overlap
Date: Tue, 01 May 2018 11:16:00 -0000
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--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
A quick way to try this out is to remove the add.u64 %y64,%y64,1 in the
calculation of %r109, but we run into:
...
libgomp: cuStreamSynchronize error: an illegal memory access was encountered
...
Things go wrong here at the start:
...
@ %r119 bra.uni $L12;
@ %r114 bra $L13;
mov.u64 %r84,%ar0;
mov.u64 %r85,%ar1;
// fork 2;
cvta.shared.u64 %r113,__oacc_bcast;
st.u64 [%r113],%r84;
st.u64 [%r113+8],%r85;
$L13:
$L12:
bar.sync 0;
@ %r114 bra $L11;
// forked 2;
cvta.shared.u64 %r112,__oacc_bcast;
ld.u64 %r84,[%r112];
ld.u64 %r85,[%r112+8];
mov.u32 %r75,%ntid.y;
mov.u32 %r76,%tid.y;
setp.gt.s32 %r86,%r76,31;
selp.u32 %r117,1,0,%r86;
st.u32 [%r109],%r117;
$L11:
...
- First we broadcast to the generic partition (%r113 stores)
- Then we read the broadcast from the generic partition (%r112 loads)
- Then we broadcast to the per-worker partition (%r109 store)
The problem is that there's nothing to guarantee that the read of the generic
broadcast in worker 1 is done before the broadcast to the per-worker partition
in worker 0 overwrites it.
By inserting a barrier inbetween, the test-case passes:
...
@ %r114 bra $L11a;
// forked 2;
cvta.shared.u64 %r112,__oacc_bcast;
ld.u64 %r84,[%r112];
ld.u64 %r85,[%r112+8];
$L11a:
bar.sync 0;
@ %r114 bra $L11b;
mov.u32 %r75,%ntid.y;
mov.u32 %r76,%tid.y;
setp.gt.s32 %r86,%r76,31;
selp.u32 %r117,1,0,%r86;
st.u32 [%r109],%r117;
$L11b:
...
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From: "davmac at davmac dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Tue, 01 May 2018 11:17:00 -0000
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--- Comment #56 from Davin McCall <davmac at davmac dot org> ---
(In reply to James Kuyper Jr. from comment #55)
> The problem is, you're using a statement that the access must occur via a
> union, with the implication that the code in question does not access the
> member through the union.
If "via a union" allows that at some point that the address of a union member
was taken and that pointer is then dereferenced, and type punning via a union
is allowed (as is implied by another footnote in the same section), then:
1) all type-based alias analysis is effectively impossible
2) the "special guarantee" clause is completely redundant, and the requirement
for visibility of the union declaration doubly so.
The real problem is that "it is permitted to inspect" doesn't say how one
should perform an "inspection" nor what the result should be. You want it to
mean "access (read) the structure member in the normal way and have its value
match that of the corresponding structure member from the common initial
sequence of the active member". But the "special guarantee" grants a
permission, which is most easily read as not doing anything other than
specifying that a certain action (reading a struct member) doesn't have
undefined behaviour in certain circumstances.
It's not even actually explicated that the value read should match that of the
corresponding common-initial-sequence member of the struct object that is the
active member of the union object in question; in thinking that it should be,
we're already making the assumption that this clause is intended to permit a
certain case of type-punning. But, as I noted above, if type-punning is
generally allowed, and if accessing via the union "immediately" has the same
semantics as taking the address of the union member and accessing via the
resulting pointer - then the clause isn't necessary anyway, except to mandate
that the common-initial-sequence layout is identical between distinct structs
which are punned in this way, and in that case what is the point of requiring
that the union declaration be visible? (Unless you want to argue that the point
is to mandate the common initial sequence layout is necessarily identical only
if the union declaration is visible; however, since the layout necessarily
applies to the rest of the program also, why should it matter where the union
declaration is?).
So for your interpretation I believe you need that either:
1) type punning via a union is not normally permissible, despite the footnote
claiming it is, and
2) a lot of production code is broken.
or
1) type punning via a union is permissible and the "special guarantee" clause
serves only to enforce common layout of structs, and the union declaration
amendment is not sensible, and
2) TBAA is impossible and most current compilers are broken.
or
1) type punning via a union is permissible, but the semantics of accessing a
member of the union "immediately" do differ to those of taking the address of
the member and later dereferencing it, despite the fact that the text does not
explicate this, and
2) the "special guarantee" clause changes the semantics of "indirect" union
member access to match those of "direct" member access, in specified cases,
despite that the present wording only dances around this topic without ever
touching it.
> The standard explicitly says, referring to the same example mentioned in DR
> 257, that the second code fragment is not valid, but only "because the union
> type is not visible within function f", implying that it would be valid if
> the declaration of the union type were moved so that it would be visible
> inside f(). If it were so moved, it would be essentially equivalent to the
> code which was the original defect report. While examples are non-normative,
> that example implies that the visibility clause was intended to actually
> serve a purpose (and it seems obvious to me that it actually does so).
I'm not arguing that N685 wasn't intended to do exactly as you suggest, but I'm
not sure the wording pre-amendment really suffered from the problem that N685
supposedly addresses, and I certainly don't agree that the amended wording is
clear in meaning.
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Subject: [Bug target/85582] [9 Regression] wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode
Date: Tue, 01 May 2018 11:24:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-603125-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 11:35:48 2018
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Subject: [Bug target/85582] [9 Regression] wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 44045
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44045&action=edit
gcc9-pr85582.patch
Untested fix.
>From gcc-bugs-return-603127-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 12:18:52 2018
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Subject: [Bug fortran/85581] implied DO not initializing array as expected
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Dominique d'Humieres from comment #1)
> AFAICT this has been fixed for 8.0.1 and trunk (9.0), my guess is revision
> r255294.
Correct, that was the revision.
*** This bug has been marked as a duplicate of bug 83224 ***
>From gcc-bugs-return-603126-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 12:18:52 2018
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Subject: [Bug fortran/83224] creating character array from elements shorter than declared does not pad with whitespace properly and aborts
Date: Tue, 01 May 2018 12:18:00 -0000
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--- Comment #11 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
*** Bug 85581 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603128-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 12:33:19 2018
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Subject: [Bug fortran/85507] [6/7/8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
Date: Tue, 01 May 2018 12:33:00 -0000
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--- Comment #6 from vehre at gcc dot gnu.org ---
Candidate patch available here:
https://gcc.gnu.org/ml/fortran/2018-04/msg00120.html
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Subject: [Bug c++/85580] [8/9 Regression] "conflicting C language linkage declaration" warning for variables with identical names in `extern "C"` functions
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--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Tue May 1 12:45:49 2018
New Revision: 259793
URL: https://gcc.gnu.org/viewcvs?rev=259793&root=gcc&view=rev
Log:
PR c++/85580 - extern "C" and local variables
* name-lookup.c (check_extern_c_conflict): Ignore local decls.
Added:
trunk/gcc/testsuite/g++.dg/parse/extern-C-2.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/name-lookup.c
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85507] [6/7/8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
Date: Tue, 01 May 2018 12:51:00 -0000
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--- Comment #7 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Thanks for the proposed bugfix. Did you check that also OpenCoarrays 2.0
compiles again with this fix?
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Subject: [Bug c++/85580] [8 Regression] "conflicting C language linkage declaration" warning for variables with identical names in `extern "C"` functions
Date: Tue, 01 May 2018 12:55:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[8/9 Regression] |[8 Regression] "conflicting
|"conflicting C language |C language linkage
|linkage declaration" |declaration" warning for
|warning for variables with |variables with identical
|identical names in `extern |names in `extern "C"`
|"C"` functions |functions
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed on trunk so far.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85585] New: switch to select a string based on an enum can profitably optimize away the table of pointers/offsets into fixed-length char[] blocks. Or use byte offsets into a string table
Date: Tue, 01 May 2018 12:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85585
Bug ID: 85585
Summary: switch to select a string based on an enum can
profitably optimize away the table of pointers/offsets
into fixed-length char[] blocks. Or use byte offsets
into a string table
Product: gcc
Version: 9.0
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Bug 84011 shows some really silly code-gen for PIC code and discussion
suggested using a table of offsets instead of a table of actual pointers, so
you just need one base address.
A further optimization is possible when the strings are all similar length,
and/or the longest one isn't much longer than a pointer:
Pad all strings to the same length with trailing 0 bytes, and calculate a
pointer instead of loading it from an array. This removes the possibility of
multiple entries sharing the same suffix (which is a missed optimization gcc
wasn't already doing), but avoids needing any space for storing pointers in
memory at all.
In the case discussed in bug 84011 (Linux's phy.h const char
*phy_modes(phy_interface_t interface)), the longest strings are 11 bytes
(including the \0), and there are 23 of them. So it takes 253 bytes of char
data to store everything (not counting the "unknown" for the default: special
case) with all strings padded to 11 bytes.
----
The current strings + pointer-table implementation doesn't merge string
literals where one string is a suffix of another; this is another a
missed-optimization that would save many bytes here. (e.g. instead of .string
"mii" and .string "gmii", just have .LC4 .byte 's'; .LC3: .byte 'g'; .LC2:
.string "mii".)
That optimization plus byte or 16-bit offsets into the table would be nice and
compact, and most CPUs have efficient zero-extending narrow loads. So for
cases where the other optimization I'm suggesting isn't good, that would
probably be best.
----
The current packed string-data takes 158 bytes , so with 4-byte offsets it
takes 158+23*4 = 250 bytes. Or with 8-byte pointers/offsets, it takes 158 +
23*8 = 342 bytes. Or with 1-byte offsets, 158 + 23*1 = 181 bytes: load with
movzbl. (If you can't use the offset directly as an 8-byte memory source
operand for ADD to a pointer, there's no point making it 32 bits instead of 8.)
The code for *using* such a table is quite simple. This C source compiles to
what I'm suggesting:
https://godbolt.org/g/E8J3iS
struct foo {
char str[11];
} const table[23] = {};
const char *lookup(unsigned long idx) {
if(idx > 23) {
return "unknown";
//idx=23;
}
return table[idx].str;
}
Multiply by 11 only takes 2 LEA instructions on x86, so for PIC code with a
RIP-relative LEA we end up with 4 ALU instructions total to get a string
address, after checking the if condition:
# gcc7.3 -march=haswell -O3 -fPIE output: https://godbolt.org/g/qMzaY8
leaq .LC0(%rip), %rax # "unknown"
cmpq $23, %rdi
ja .L4 # branchless is also an option
leaq (%rdi,%rdi,4), %rax
leaq table(%rip), %rdx # RIP-relative table base address
leaq (%rdi,%rax,2), %rax
addq %rdx, %rax # table + 11*idx
.L4:
ret
This is even better in no-PIE mode where a static address is usable as a signed
32-bit immediate:
lookup(unsigned long):
movl $.LC0, %eax
cmpq $23, %rdi
ja .L4
leaq (%rdi,%rdi,4), %rax
leaq table(%rdi,%rax,2), %rax # 3 cycle latency for 3-component
LEA on SnB-family
.L4:
ret
So this has extremely low code-size cost on x86-64, for the benefit of removing
a table load in the dependency chain from enum to string data. It does cost
significant data size vs. a byte-offset table with suffix-merging, but it's
better than what gcc is doing now in non-PIE (table of qword pointers), and
*much* better in PIE (insane jump table).
-----
The byte-index version is equivalent to transforming the C source like this:
const char packedstrings[158] = {};
const unsigned char offsets[23] = {};
const char *lookup_byteidx(unsigned long idx) {
if(idx>23)
return "unknown";
return &packedstrings[offsets[idx]];
}
leaq .LC0(%rip), %rax # "unknown"
cmpq $23, %rdi
ja .L9
leaq offsets(%rip), %rax
leaq packedstrings(%rip), %rdx
movzbl (%rax,%rdi), %eax
addq %rdx, %rax
.L9:
ret
We can save an instruction here by making the relative position of
packedstrings and offsets a compile-time constant, i.e. by effectively putting
them in a struct. So
...
ja .L9
leaq packedstrings(%rip), %rdx
movzbl offsets-packedstrings(%rdx,%rdi), %eax
add %rdx, %rax
base+idx + disp8 for a load isn't slower than base+idx on modern x86, unlike
for LEA. This lets us still use add instead of a 3-component LEA. Arrange
them so offsets-packedstrings fits in a signed 8-bit integer if possible, so
you can use a short displacement. (i.e. put the shorter one first, almost
always offsets unless a lot of the strings are duplicated.)
We can represent this idea in C source like this:
struct {
unsigned char offsets[23];
char packedstrings[158];
}const stringtab = {};
const char *lookup_stringtab(unsigned long idx) {
if(idx>23)
return "unknown";
unsigned off = stringtab.offsets[idx];
// TODO: make off relative to stringtab so we avoid a separate +23
return &stringtab.packedstrings[off];
}
but unfortunately we get this asm with -O3 -march=haswell
leaq stringtab(%rip), %rax
movzbl (%rax,%rdi), %edx
leaq 23(%rax,%rdx), %rax # 3-component LEA
We could optimize away the +23 by baking that into the byte offsets, if we
don't need the full 0..255 range.
leaq stringtab(%rip), %rax
movzbl (%rax,%rdi), %edx # offset relative to the start of
stringtab
add %rdx, %rax
It's very nice with no-PIE, whether we tell gcc to keep the arrays together or
not:
movzbl stringtab(%rdi), %eax
addq $packedstrings, %rax
# missed opt: addl is safe; address is inside a static object and
thus fits in 32 bits.
These compile fairly nicely for ARM32 and AArch64, even with -fPIE. ARM32
could maybe save an instruction or two by doing a +440 once and using a
2-register addressing mode, though. Or choosing a smarter PIC anchor closer to
the data.
I guess this could be broken up into multiple missed-optimization bug reports,
some of which are independent enough to file separately:
1. look for one string literal being a suffix of another (in general,
regardless of tables)
2. pad strings to fixed length and calculate, if it's worth it, for
integer->string mapping functions. (Need a heuristic to trade off code size
vs. data size vs. removing a level of indirection for latency)
3. use byte or 16-bit offsets to the base of consecutive strings (unless
literal-merging between separate tables means we want 32-bit offsets). Merging
with literals that aren't part of a different table is fine; they can just
reference a string as part of a table.
4. address one static array relative to the other when they're defined in the
same compilation unit, so save on RIP-relative LEA instructions. ARM already
does this, but MIPS64 and x86 PIC/PIE miss it. (At least the old gcc5.4 on
Godbolt does, didn't check newer MIPS gcc). Especially try to put them next to
each other so it can be a disp8 instead of disp32 on x86.
5. For struct members, put the disp8 on a load so we can use add instead of
3-component LEA, with -mtune=intel. (If generating this internally for a
string lookup, bake in the offset so you don't need either, if that still fits
in byte offsets.)
https://godbolt.org/g/E8J3iS demonstrates all of these (same link as above).
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Subject: [Bug tree-optimization/85585] switch to select a string based on an enum can profitably optimize away the table of pointers/offsets into fixed-length char[] blocks. Or use byte offsets into a string table
Date: Tue, 01 May 2018 13:07:00 -0000
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--- Comment #1 from Peter Cordes <peter at cordes dot ca> ---
By comparison, the no-PIE table of pointers only needs one instruction:
movq CSWTCH.4(,%rdi,8), %rax
So all my suggestions cost 1 extra instruction on x86 in no-PIE mode, but at a
massive savings in data size.
clang -fPIE compiles the plain switch to the obvious / sane 2 instruction
sequence which should be our baseline for normal cases.
# clang6.0 -fPIE -O3 (switch compilers on the Godbolt link)
leaq .Lswitch.table.phy_modes(%rip), %rcx
movq (%rcx,%rax,8), %rax
Clang is willing to make a table that needs relocations for the entries. (My
suggestions all avoid that because they're based on offsets, not a table of
pointers. Avoiding rodata relocations that dirty a page and prevent sharing
has some non-zero value, although it's low on many architectures where memory
is cheap.)
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85434] Address of stack protector guard spilled to stack on ARM
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Maxim Kuvyrkov <mkuvyrkov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mkuvyrkov at gcc dot gnu.org
--- Comment #10 from Maxim Kuvyrkov <mkuvyrkov at gcc dot gnu.org> ---
Patch posted: https://gcc.gnu.org/ml/gcc-patches/2018-04/msg01264.html
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From: "teodor_spaeren at riseup dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85586] New: Optimizer produces different result on -O2 and -O3
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Bug ID: 85586
Summary: Optimizer produces different result on -O2 and -O3
Product: gcc
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Assignee: unassigned at gcc dot gnu.org
Reporter: teodor_spaeren at riseup dot net
Target Milestone: ---
Created attachment 44046
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44046&action=edit
The preproccessed code
The problem here is that the 9.0 versions of GCC produces different results on
-O2 and -O3 optimization levels.
Running the program with a 9.0 version of gcc returns this:
O3: fe fe ff ff fe ff ff fd fd ff fd fd ff fe fe ff fd fd ff fd fe ff fc fd ff
fa fa ff fc fc ff fd ff ff fd ff ff fe fd ff fd e2 ff f3 aa ff cb 66 ec c1 50
ff de 83 ff fd d9 ff fe f5
O2: fe fe ff fe fe ff fd fd fd fd fd fd fe fe fe fd fd fd ff fd fe fe fc fd fa
fa fa fc fc fc ff fd ff ff fd ff ff fe fd ff fd e2 ff f3 aa f1 cb 66 ec c1 50
ff de 83 ff fd d9 ff fe f5
DF: ?? ?? ?? ?? ?? ?? ??
?? ??
running it on a 7.3.1 version of gcc returns this:
O3: fe fe ff fe fe ff fd fd fd fd fd fd fe fe fe fd fd fd ff fd fe fe fc fd fa
fa fa fc fc fc ff fd ff ff fd ff ff fe fd ff fd e2 ff f3 aa f1 cb 66 ec c1 50
ff de 83 ff fd d9 ff fe f5
O2: fe fe ff fe fe ff fd fd fd fd fd fd fe fe fe fd fd fd ff fd fe fe fc fd fa
fa fa fc fc fc ff fd ff ff fd ff ff fe fd ff fd e2 ff f3 aa f1 cb 66 ec c1 50
ff de 83 ff fd d9 ff fe f5
DF:
As you can see the function returns two different results based on what
optimization level is used.
Commenting out line 33 and 58 resolves this, so it might be related to to a
double write. Adding -fno-tree-vectorize to the options makes the output be the
same.
Here is the full output from compiling it:
hermes@dever> ~/madsci/gcc-latest/bin/gcc -v -save-temps -O3 -Wall -Wextra -o
testcase-O3 testcase.c
~/kode/misc/lol/testcase
Using built-in specs.
COLLECT_GCC=/home/rhermes/madsci/gcc-latest/bin/gcc
COLLECT_LTO_WRAPPER=/home/rhermes/madsci/gcc-latest/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/rhermes/madsci/gcc-latest
--enable-languages=c,c++,fortran --enable-threads=posix --enable-default-ssp
--enable-checking=release --enable-shared --enable-linker-hash-style=gnu
--enable-gnu-unique-object --with-isl --enable-libmpx --enable-linker-build-id
--enable-lto --enable-__cxa_atexit --disable-libunwind-exceptions
--enable-clocale=gnu --disable-libstdcxx-pch --enable-default-pie
--enable-gnu-indirect-function --disable-werror --enable-plugin
--enable-install-libiberty
Thread model: posix
gcc version 9.0.0 20180428 (experimental) (GCC)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-Wall' '-Wextra' '-o'
'testcase-O3' '-mtune=generic' '-march=x86-64'
/home/rhermes/madsci/gcc-latest/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/cc1 -E
-quiet -v testcase.c -mtune=generic -march=x86-64 -Wall -Wextra -O3
-fpch-preprocess -o testcase.i
ignoring nonexistent directory
"/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/include
/usr/local/include
/home/rhermes/madsci/gcc-latest/include
/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/include-fixed
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-Wall' '-Wextra' '-o'
'testcase-O3' '-mtune=generic' '-march=x86-64'
/home/rhermes/madsci/gcc-latest/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/cc1
-fpreprocessed testcase.i -quiet -dumpbase testcase.c -mtune=generic
-march=x86-64 -auxbase testcase -O3 -Wall -Wextra -version -o testcase.s
GNU C17 (GCC) version 9.0.0 20180428 (experimental) (x86_64-pc-linux-gnu)
compiled by GNU C version 9.0.0 20180428 (experimental), GMP version
6.1.0, MPFR version 3.1.4, MPC version 1.0.3, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C17 (GCC) version 9.0.0 20180428 (experimental) (x86_64-pc-linux-gnu)
compiled by GNU C version 9.0.0 20180428 (experimental), GMP version
6.1.0, MPFR version 3.1.4, MPC version 1.0.3, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 32786d944114cff1f3c130ef77b2ba68
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-Wall' '-Wextra' '-o'
'testcase-O3' '-mtune=generic' '-march=x86-64'
as -v --64 -o testcase.o testcase.s
GNU assembler version 2.30 (x86_64-pc-linux-gnu) using BFD version (GNU
Binutils) 2.30
COMPILER_PATH=/home/rhermes/madsci/gcc-latest/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/:/home/rhermes/madsci/gcc-latest/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/:/home/rhermes/madsci/gcc-latest/libexec/gcc/x86_64-pc-linux-gnu/:/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/:/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/
LIBRARY_PATH=/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/:/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-Wall' '-Wextra' '-o'
'testcase-O3' '-mtune=generic' '-march=x86-64'
/home/rhermes/madsci/gcc-latest/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/collect2
-plugin
/home/rhermes/madsci/gcc-latest/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/liblto_plugin.so
-plugin-opt=/home/rhermes/madsci/gcc-latest/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
-plugin-opt=-fresolution=testcase.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 --build-id
--eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -pie
-o testcase-O3 /lib/../lib64/Scrt1.o /lib/../lib64/crti.o
/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/crtbeginS.o
-L/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0
-L/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/../../../../lib64
-L/lib/../lib64 -L/usr/lib/../lib64
-L/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/../../..
testcase.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed
-lgcc_s --no-as-needed
/home/rhermes/madsci/gcc-latest/lib/gcc/x86_64-pc-linux-gnu/9.0.0/crtendS.o
/lib/../lib64/crtn.o
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-Wall' '-Wextra' '-o'
'testcase-O3' '-mtune=generic' '-march=x86-64'
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Subject: [Bug middle-end/85586] [8/9 Regression] Optimizer produces different result on -O2 and -O3
Date: Tue, 01 May 2018 13:18:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-01
Known to work| |7.3.0
Summary|Optimizer produces |[8/9 Regression] Optimizer
|different result on -O2 and |produces different result
|-O3 |on -O2 and -O3
Ever confirmed|0 |1
Known to fail| |8.0.1
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Subject: [Bug middle-end/84955] [7 Regression] Incorrect OpenACC tile expansion
Date: Tue, 01 May 2018 13:22:00 -0000
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--- Comment #9 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Tue May 1 13:21:19 2018
New Revision: 259795
URL: https://gcc.gnu.org/viewcvs?rev=259795&root=gcc&view=rev
Log:
backport "[openacc] Fix ICE when compiling tile loop containing infinite loop"
2018-05-01 Tom de Vries <tom@codesourcery.com>
backport from trunk:
2018-04-16 Cesar Philippidis <cesar@codesourcery.com>
Tom de Vries <tom@codesourcery.com>
PR middle-end/84955
* omp-expand.c (expand_oacc_for): Add dummy false branch for
tiled basic blocks without omp continue statements.
* testsuite/libgomp.oacc-c-c++-common/pr84955.c: New test.
* testsuite/libgomp.oacc-fortran/pr84955.f90: New test.
Added:
branches/gcc-7-branch/libgomp/testsuite/libgomp.oacc-c-c++-common/pr84955.c
branches/gcc-7-branch/libgomp/testsuite/libgomp.oacc-fortran/pr84955.f90
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/omp-expand.c
branches/gcc-7-branch/libgomp/ChangeLog
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From: "peter at cordes dot ca" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/84011] Optimize switch table with run-time relocation
Date: Tue, 01 May 2018 13:24:00 -0000
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Peter Cordes <peter at cordes dot ca> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |peter at cordes dot ca
--- Comment #9 from Peter Cordes <peter at cordes dot ca> ---
(In reply to rguenther@suse.de from comment #4)
> An optimization would be to
> add an indirection by, say, only recording the constant offset
> into an "array of strings" in the table, thus effectively
>
> "case1\0case2\0..."[CSWITCH[i]]
>
> which would require only a relocation to access the single string
> constant. But it would prohibit cases of string merging within
> those strings unless we implement that as well for this optimization.
gcc already totally misses optimizations here where one string is a suffix of
another. "mii" could just be a pointer to the 3rd byte of "sgmii", but we
instead duplicate all the characters. That's where major savings are possible
for this function.
> Note this might be profitable unconditionally, not just with -fpie/pic
> as the CSWITCH table would be smaller (dependent on the total
> size of the merged string).
Indeed, I wrote up bug 85585 with ideas for optimizing this. A table of byte
or uint16_t offsets into a static buffer of packed strings looks good for PIC
and for position-dependent.
To avoid any runtime relocations, all you need is the ability to get a static
address into a register (e.g. RIP-relative LEA) and do an indexed load relative
to it, just like using a normal static char[]. Then add the load result to
that address. Runtime relocation is nice to avoid even if you don't *need* to
avoid it.
Also possible is padding each string out to a constant length and calculating
an index into that, removing a level of indirection. (Good when strings are
similar length and/or all short, and there aren't many strings that are
duplicates or suffixes of others.) Again you just need to get a static address
into a register, and add it to 11*enum_value. This is all ADD + LEA (with one
of them being RIP-relative).
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Subject: [Bug c++/85580] [8 Regression] "conflicting C language linkage declaration" warning for variables with identical names in `extern "C"` functions
Date: Tue, 01 May 2018 13:31:00 -0000
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--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Tue May 1 13:29:52 2018
New Revision: 259796
URL: https://gcc.gnu.org/viewcvs?rev=259796&root=gcc&view=rev
Log:
PR c++/85580 - extern "C" and local variables
* name-lookup.c (check_extern_c_conflict): Ignore local decls.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/parse/extern-C-2.C
Modified:
branches/gcc-8-branch/gcc/cp/ChangeLog
branches/gcc-8-branch/gcc/cp/name-lookup.c
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Subject: [Bug fortran/85507] [6/7/8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
Date: Tue, 01 May 2018 13:31:00 -0000
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--- Comment #8 from vehre at gcc dot gnu.org ---
Just now. OC 2.0 compiles fine with the proposed patch. I am just now working
on getting the remaining get-send-issues fixed for gcc-8 in OC 2.0+.
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Subject: [Bug middle-end/84955] [7 Regression] Incorrect OpenACC tile expansion
Date: Tue, 01 May 2018 13:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84955
Tom de Vries <vries at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #10 from Tom de Vries <vries at gcc dot gnu.org> ---
Patch backported to gcc-7-branch, marking resolved-fixed.
>From gcc-bugs-return-603142-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 13:34:58 2018
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85507] [6/7/8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
Date: Tue, 01 May 2018 13:34:00 -0000
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--- Comment #9 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Thanks for the proposed bugfix. Did you check that also OpenCoarrays 2.0
> compiles again with this fix?
It does with reverting the change in dependency.c with two failures in the test
suite:
17 - alloc_comp_multidim_shape (Failed)
56 - get-put-allocatable-comp (Failed)
>From gcc-bugs-return-603143-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 13:35:19 2018
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Subject: [Bug middle-end/85586] [8/9 Regression] Optimizer produces different result on -O2 and -O3
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rsandifo at gcc dot gnu.org
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Seems to be due to r256644
>From gcc-bugs-return-603144-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 13:51:16 2018
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/84011] Optimize switch table with run-time relocation
Date: Tue, 01 May 2018 13:51:00 -0000
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--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Peter Cordes from comment #9)
> gcc already totally misses optimizations here where one string is a suffix
> of another. "mii" could just be a pointer to the 3rd byte of "sgmii", but
> we instead duplicate all the characters. That's where major savings are
> possible for this function.
?? That is the task for the linker SHF_MERGE|SHF_STRINGS handling.
Why should gcc duplicate that?
>From gcc-bugs-return-603145-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 13:54:44 2018
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Subject: [Bug tree-optimization/84011] Optimize switch table with run-time relocation
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--- Comment #11 from Jan Hubicka <hubicka at ucw dot cz> ---
>
> ?? That is the task for the linker SHF_MERGE|SHF_STRINGS handling.
> Why should gcc duplicate that?
I suppose there would be small room for improvements where GCC could use the
fact that one string's address is actually address of another string + offset.
That may save some relocations.
Honza
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Subject: [Bug middle-end/85586] [8/9 Regression] Optimizer produces different result on -O2 and -O3
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
Target Milestone|--- |8.0
>From gcc-bugs-return-603147-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 14:00:02 2018
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From: "vehre at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85507] [6/7/8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
Date: Tue, 01 May 2018 14:00:00 -0000
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--- Comment #10 from vehre at gcc dot gnu.org ---
(In reply to Dominique d'Humieres from comment #9)
> > Thanks for the proposed bugfix. Did you check that also OpenCoarrays 2.0
> > compiles again with this fix?
>
> It does with reverting the change in dependency.c with two failures in the
> test suite:
>
> 17 - alloc_comp_multidim_shape (Failed)
> 56 - get-put-allocatable-comp (Failed)
Well, that's kind of misleading. The change in the dependency.c introduced by
the patch I proposed above should not be reverted. This patch rather reverts
one of my previous patches.
>From gcc-bugs-return-603148-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 14:04:28 2018
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Subject: [Bug c++/85580] [8 Regression] "conflicting C language linkage declaration" warning for variables with identical names in `extern "C"` functions
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-603149-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 14:09:27 2018
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From: "ian at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug go/85429] Several gotools tests FAIL with Solaris as
Date: Tue, 01 May 2018 14:09:00 -0000
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--- Comment #11 from ian at gcc dot gnu.org <ian at gcc dot gnu.org> ---
Author: ian
Date: Tue May 1 14:08:44 2018
New Revision: 259797
URL: https://gcc.gnu.org/viewcvs?rev=259797&root=gcc&view=rev
Log:
PR go/85429
cmd/go: support more Solaris assembler syntaxes
Patch by Rainer Orth.
Reviewed-on: https://go-review.googlesource.com/110563
Modified:
trunk/gcc/go/gofrontend/MERGE
trunk/libgo/go/cmd/go/internal/work/buildid.go
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Subject: [Bug fortran/85507] [6/7/8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
Date: Tue, 01 May 2018 14:31:00 -0000
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--- Comment #11 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> > It does with reverting the change in dependency.c with two failures in the
> > test suite:
> >
> > 17 - alloc_comp_multidim_shape (Failed)
> > 56 - get-put-allocatable-comp (Failed)
>
> Well, that's kind of misleading. ...
Sorry about the confusion. I as referring to comment 2.
Note that the full patch does not fix the above failures.
>From gcc-bugs-return-603151-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 14:39:38 2018
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Subject: =?UTF-8?B?W0J1ZyBjKysvODU1ODddIE5ldzogYm9ndXMgZXJyb3I6IOKAmEbigJkgd2Fz?= =?UTF-8?B?IG5vdCBkZWNsYXJlZCBpbiB0aGlzIHNjb3Bl?Date: Tue, 01 May 2018 14:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85587
Bug ID: 85587
Summary: bogus error: ‘F’ was not declared in this scope
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mpolacek at gcc dot gnu.org
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template <int N>
struct S
{
enum class T
{
E, F
};
void foo ();
};
template <int N>
void S<N>::foo ()
{
decltype (T::F) t;
}
void
bar ()
{
S<0> s;
s.foo ();
}
is rejected since r251438.
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.2
Summary|bogus error: ‘F’ was not |[8/9 Regression] bogus
|declared in this scope |error: ‘F’ was not declared
| |in this scope
>From gcc-bugs-return-603153-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 14:45:47 2018
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Subject: [Bug middle-end/85586] [8/9 Regression] Optimizer produces different result on -O2 and -O3
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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
--- Comment #2 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Mine.
>From gcc-bugs-return-603154-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 14:49:58 2018
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From: "kristerw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/85588] New: -fwrapv miscompilation
Date: Tue, 01 May 2018 14:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85588
Bug ID: 85588
Summary: -fwrapv miscompilation
Product: gcc
Version: 9.0
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GCC miscompiles gcc/testsuite/gcc.dg/torture/pr57656.c when using -fwrapv
> gcc -fwrapv pr57656.c
> ./a.out
Abort (core dumped)
The problem seems to be exactly the same as in PR57656 (but when using
-fwrapv):
t = 1 - ((a - b) / c);
is changed to
t = (b - a) / c + 1;
which is not the same in this case where both (a - b) and (b - a) have the
value 0x80000000.
This fails in GCC 6 and newer versions. Compiling using GCC 5 produces the
correct result.
>From gcc-bugs-return-603155-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 14:54:29 2018
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Subject: [Bug fortran/85507] [6/7/8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
Date: Tue, 01 May 2018 14:54:00 -0000
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--- Comment #12 from vehre at gcc dot gnu.org ---
This patch is not referring to the failures in Opencoarrays. The fix for #56 is
in Opencoarray's pull request #528. The other one has nothing to do with this
initial issue and is not of my current concern.
>From gcc-bugs-return-603156-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 14:55:40 2018
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Subject: [Bug tree-optimization/85588] -fwrapv miscompilation
Date: Tue, 01 May 2018 14:55:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-01
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-603157-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 14:58:03 2018
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From: "peter at cordes dot ca" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/84011] Optimize switch table with run-time relocation
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--- Comment #12 from Peter Cordes <peter at cordes dot ca> ---
(In reply to Jakub Jelinek from comment #10)
> (In reply to Peter Cordes from comment #9)
> > gcc already totally misses optimizations here where one string is a suffix
> > of another. "mii" could just be a pointer to the 3rd byte of "sgmii", but
> > we instead duplicate all the characters. That's where major savings are
> > possible for this function.
>
> ?? That is the task for the linker SHF_MERGE|SHF_STRINGS handling.
> Why should gcc duplicate that?
Oops, right I was only looking at gcc's asm output, didn't check an actual
linked binary.
Will the linker currently catch a case like this?
.LC_base:
.LC2: .string "mii"
.LC3: .string "gmii"
table:
.byte .LC2 - .LC_base, .LC3 - .LC_base
and drop .string "mii" entirely + rewrite the table to
.byte .LC3+1 - .LC_base, .LC3 - .LC_base
(This discussion should probably be happening on bug 85585.)
Sorry I don't know the actual mechanism by which gcc signals to the linker that
it can / can't merge. I guess only in some sections? Because gcc couldn't
allow it if was emitting an array like this, where dropping a string would
change the offsets for later data and break offset calculations:
const struct { char str[11]; } table[] = { {"mii"}, {"gmii"} };
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Subject: [Bug tree-optimization/85585] switch to select a string based on an enum can profitably optimize away the table of pointers/offsets into fixed-length char[] blocks. Or use byte offsets into a string table
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85585
--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Tue, 1 May 2018, peter at cordes dot ca wrote:
> The current strings + pointer-table implementation doesn't merge string
> literals where one string is a suffix of another; this is another a
The linker does that, as well as merging identical strings in different
translation units, via strings going in specially marked string sections
(".section .rodata.str1.1,"aMS",@progbits,1"). These proposed
optimizations would interfere with such linker optimizations, so they
might not be a code size win.
>From gcc-bugs-return-603159-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 15:05:40 2018
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Subject: [Bug c++/85589] New: Non type template parameter should allow object with no linkage
Date: Tue, 01 May 2018 15:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85589
Bug ID: 85589
Summary: Non type template parameter should allow object with
no linkage
Product: gcc
Version: 7.3.1
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Even though n4268 is marked as supported fully here:
https://gcc.gnu.org/projects/cxx-status.html, GCC does not yet support passing
the address or reference to an object with no linkage.
Such code should compile under C++17:
template<auto& v> struct foo {};
int main() {
static auto v = "str";
(void) foo<v> {};
}
But fail with:
error: 'v' is not a valid template argument for type 'const char*&' because
object 'v' does not have linkage
(void) foo<v> {};
^
Such code compiles under clang 6.0.0.
Live example: https://godbolt.org/g/aXjDBg
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Tue, 01 May 2018 15:12:00 -0000
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--- Comment #57 from Andrew Haley <aph at gcc dot gnu.org> ---
(In reply to Davin McCall from comment #52)
> (In reply to Andrew Haley from comment #45)
> > (In reply to Davin McCall from comment #44)
> > > The "one special guarantee" clause appears in the section describing union
> > > member access via the "." or "->" operators, implying that it only applies
> > > to the access of union members via the union.
> >
> > I don't believe that's what is intended, or that you can make such a
> > conclusion based on the section in which the rule appears. It applies
> > to other accesses too, as is (somewhat) made clear by the rationale in
> > http://www.open-std.org/jtc1/sc22/wg14/www/docs/n685.htm:
>
> It certainly may not be what is intended by N685, but I think it's normally
> reasonable to conclude that a statement in a particular section of a
> document applies to that section and not more universally than that; in this
> case, the "universal" interpretation flatly contradicts the strict aliasing
> rule and any other rule which would otherwise disallow access, which seems
> extremely problematic to me.
>
> In general it appears the committee have asserted that the "universal"
> interpretation (which since N685 requires visibility of the union
> declaration to be effective) is the correct one, but my argument
... doesn't really matter from a practical point of view, does it?
That ship has sailed.
> is that the actual text of the standard strongly implies something
> different, and that the interpretation being pushed instead turns
> another portion of the standard text into nonsense.
I don't think that's it really does, but I think we're done.
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From: "davmac at davmac dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Tue, 01 May 2018 15:26:00 -0000
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--- Comment #58 from Davin McCall <davmac at davmac dot org> ---
(In reply to Andrew Haley from comment #57)
> (In reply to Davin McCall from comment #52)
> > (In reply to Andrew Haley from comment #45)
> > > (In reply to Davin McCall from comment #44)
> > > > The "one special guarantee" clause appears in the section describing union
> > > > member access via the "." or "->" operators, implying that it only applies
> > > > to the access of union members via the union.
> > >
> > > I don't believe that's what is intended, or that you can make such a
> > > conclusion based on the section in which the rule appears. It applies
> > > to other accesses too, as is (somewhat) made clear by the rationale in
> > > http://www.open-std.org/jtc1/sc22/wg14/www/docs/n685.htm:
> >
> > It certainly may not be what is intended by N685, but I think it's normally
> > reasonable to conclude that a statement in a particular section of a
> > document applies to that section and not more universally than that; in this
> > case, the "universal" interpretation flatly contradicts the strict aliasing
> > rule and any other rule which would otherwise disallow access, which seems
> > extremely problematic to me.
> >
> > In general it appears the committee have asserted that the "universal"
> > interpretation (which since N685 requires visibility of the union
> > declaration to be effective) is the correct one, but my argument
>
> ... doesn't really matter from a practical point of view, does it?
> That ship has sailed.
Well, if the amendment doesn't make sense, I'd say it matters from a practical
point of view, yes. It can always be amended again.
> > is that the actual text of the standard strongly implies something
> > different, and that the interpretation being pushed instead turns
> > another portion of the standard text into nonsense.
>
> I don't think that's it really does, but I think we're done.
I've laid it out as best as I can in comment #56, and certainly don't have more
to add.
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Subject: [Bug web/85578] broken links in gcc-8.0.1-RC-20180427/INSTALL/specific.html, and out of date prerequisites.html
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue May 1 15:26:36 2018
New Revision: 259799
URL: https://gcc.gnu.org/viewcvs?rev=259799&root=gcc&view=rev
Log:
PR web/85578
* doc/install.texi2html: Replace _002d with - and _002a with * in
generated html files using sed.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/doc/install.texi2html
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Subject: [Bug tree-optimization/84011] Optimize switch table with run-time relocation
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--- Comment #13 from Peter Cordes <peter at cordes dot ca> ---
(In reply to Jakub Jelinek from comment #10)
> ?? That is the task for the linker SHF_MERGE|SHF_STRINGS handling.
> Why should gcc duplicate that?
Because gcc would benefit from knowing if merging makes the total block of
strings for a switch() table short enough to use a uint8_t offset[] instead of
uint16_t.
If we don't know at compile time, we'd have to be conservative and potentially
use a wider offset table. (Although as Joseph points out
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85585#c2, without more linker
support for this we could end up missing out on literal merging across
compilation units. So perhaps a first step in applying this idea would be to
use 32-bit offsets from the start of the .rodata.str1.1 section, so we can
still let the linker merge strings and end up with them non-contiguous without
having to force the one that gets kept to be the one that's part of our block
of strings.)
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue May 1 15:29:05 2018
New Revision: 259801
URL: https://gcc.gnu.org/viewcvs?rev=259801&root=gcc&view=rev
Log:
PR web/85578
* doc/install.texi2html: Replace _002d with - and _002a with * in
generated html files using sed.
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/doc/install.texi2html
>From gcc-bugs-return-603165-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 15:32:37 2018
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Subject: [Bug middle-end/85586] [8/9 Regression] Optimizer produces different result on -O2 and -O3
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--- Comment #3 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Testing a patch.
>From gcc-bugs-return-603166-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 16:13:41 2018
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>From gcc-bugs-return-603167-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 16:25:41 2018
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From: "jameskuyper at alumni dot caltech.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Tue, 01 May 2018 16:25:00 -0000
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--- Comment #59 from James Kuyper Jr. <jameskuyper at alumni dot caltech.edu> ---
(In reply to Davin McCall from comment #56)
> (In reply to James Kuyper Jr. from comment #55)
> > The problem is, you're using a statement that the access must occur via a
> > union, with the implication that the code in question does not access the
> > member through the union.
>
> If "via a union" allows that at some point that the address of a union
> member was taken and that pointer is then dereferenced, and type punning via
> a union is allowed (as is implied by another footnote in the same section),
> then:
Footnote 95 is the only one I can find which allows type punning via a union -
is that the one you're referring to? Footnote 95 makes absolutely no use of the
word "via". It says, quite explicitly, "the member used to read the contents of
a union", and therefore can't apply when not directly using an actual member to
read it. What I said about allowing indirect access was specific to the special
guarantee from 6.5.2.3p6, and was not in any way intended to imply that
indirect type punning using a union is allowed when that guarantee doesn't
apply.
> 1) all type-based alias analysis is effectively impossible
Alias analysis is only affected by the special guarantee if
a) the types involved are both struct types
b) both struct types are members of the same union
c) the struct types share a common initial sequence
d) the code in question inspects the value of one of the members of the common
initial sequence.
e) a completed declaration of the union type that they are members of is
visible at the point in the code where the inspection occurrs.
It seems to me that the overwhelming majority of cases will fail to meet at
least one of those requirements, so type-based alias analysis is still
possible, it's just made more complicated by the need to check for those
things.
> The real problem is that "it is permitted to inspect" doesn't say how one
> should perform an "inspection" nor what the result should be. You want it to
> mean "access (read) the structure member in the normal way and have its
> value match that of the corresponding structure member from the common
> initial sequence of the active member". But the "special guarantee" grants a
> permission, which is most easily read as not doing anything other than
> specifying that a certain action (reading a struct member) doesn't have
> undefined behaviour in certain circumstances.
Well, that's sufficiently vague that I can agree with it. It's the fact that,
in other circumstance, the behavior is undefined, that allows optimizations
that would fail if the pointers alias each other. Such optimizations are
therefore not allowed in the circumstances where 6.5.3.2p6 applies.
> It's not even actually explicated that the value read should match that of
> the corresponding common-initial-sequence member of the struct object that
> is the active member of the union object in question; in thinking that it
> should be, we're already making the assumption that this clause is intended
> to permit a certain case of type-punning. But, as I noted above, if
> type-punning is generally allowed,
Which is NOT what I claimed.
> ... and if accessing via the union
> "immediately" has the same semantics as taking the address of the union
> member and accessing via the resulting pointer
Which I only claimed to be true when the special guarantee applies.
> ... - then the clause isn't
> necessary anyway,
Since I didn't make the general claims you're asserting that I made, the clause
is necessary.
> ... except to mandate that the common-initial-sequence layout
> is identical between distinct structs which are punned in this way, and in
> that case what is the point of requiring that the union declaration be
> visible?
It's a pre-condition for the indirect access to be valid, which would otherwise
not be allowed.
> ... (Unless you want to argue that the point is to mandate the common
> initial sequence layout is necessarily identical only if the union
> declaration is visible;
No, I think the primary point is to disallow optimizations based upon the
normal assumption that the two struct types can't alias each other. However,
the standard does not otherwise constrain the layout of any member of a struct
type other than the first, so in any context where 6.5.2.3p6 doesn't interfere,
the common initial sequence is allowed to have different layouts in the
different struct types. I can't imagine any good reason for an implementation
to do so - I'd expect that for any given value of n, for any given
implementation of C, the location within a struct of the nth member is
determined uniquely by the types of the preceding members - but the standard
doesn't require that to be the case.
> So for your interpretation I believe you need that either:
>
> 1) type punning via a union is not normally permissible, despite the
> footnote claiming it is, and
It is permitted to use a union member to perform type-punning. Since the
results (including whether or not a trap representation is involved) depend
upon the implementation-defined representations of the two types that are being
punned, such code is never fully portable, but not all code needs to be
portable.
> 2) a lot of production code is broken.
No.
> or
>
> 1) type punning via a union is permissible
Yes
> and the "special guarantee"
> clause serves only to enforce common layout of structs,
No, because it covers indirect type punning through the use of unions, and not
just direct type punning.
> ... and the union
> declaration amendment is not sensible,
No, because it's needed to restrict the circumstances where aliasing is
permitted; without that restriction, type-based aliasing checks would be just
as badly broken as you incorrectly claim they would be.
> 2) TBAA is impossible and most current compilers are broken.
>
> or
>
> 1) type punning via a union is permissible, but the semantics of accessing a
> member of the union "immediately" do differ to those of taking the address
> of the member and later dereferencing it, despite the fact that the text
> does not explicate this, and
The test that allows union type punning does apply only to reading using a
member. The text that allows accessing the common initial sequence uses a more
general term, "inspect", so the relevant text does in fact make that
distinction.
> 2) the "special guarantee" clause changes the semantics of "indirect" union
> member access to match those of "direct" member access, in specified cases,
> despite that the present wording only dances around this topic without ever
> touching it.
It says it is permitted, which would seem to me to obviously cancel the
anti-aliasing rules that would otherwise prohibit it. I don't see the "dancing
around" that you see.
> > The standard explicitly says, referring to the same example mentioned in DR
> > 257, that the second code fragment is not valid, but only "because the union
> > type is not visible within function f", implying that it would be valid if
> > the declaration of the union type were moved so that it would be visible
> > inside f(). If it were so moved, it would be essentially equivalent to the
> > code which was the original defect report. While examples are non-normative,
> > that example implies that the visibility clause was intended to actually
> > serve a purpose (and it seems obvious to me that it actually does so).
>
> I'm not arguing that N685
Keep in mind that I'm only talking about what the current standard says; N685
is relevant to my comments only because, and therefore, only insofar as, the
current standard implements what N685 proposed.
>From gcc-bugs-return-603168-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 16:31:37 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85590] New: [nvptx, libgomp, openacc] Use cuda runtime fns to determine launch configuration in nvptx plugin
Date: Tue, 01 May 2018 16:31:00 -0000
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Bug ID: 85590
Summary: [nvptx, libgomp, openacc] Use cuda runtime fns to
determine launch configuration in nvptx plugin
Product: gcc
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Choosing runtime dimensions is done in nvptx_exec for openacc.
We could use cuda runtime functions to assist us choosing runtime dimensions,
as indicated in
https://devblogs.nvidia.com/cuda-pro-tip-occupancy-api-simplifies-launch-configuration/
.
>From gcc-bugs-return-603169-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 16:43:02 2018
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Subject: [Bug libgomp/84871] libgomp examples-4/declare_target-[12].f90 fail with nvptx Titan V offloading
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Tom de Vries <vries at gcc dot gnu.org> changed:
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--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Duplicate of PR85519.
*** This bug has been marked as a duplicate of bug 85519 ***
>From gcc-bugs-return-603170-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 16:43:03 2018
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Subject: [Bug target/85519] [nvptx, openacc, openmp, testsuite] Recursive tests may fail due to thread stack limit
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--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
*** Bug 84871 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603171-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 16:51:24 2018
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Subject: [Bug c++/85279] [6 Regression] Broken diagnostic for decltype
Date: Tue, 01 May 2018 16:51:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
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--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for 7.4.
>From gcc-bugs-return-603172-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 17:07:34 2018
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From: "haberg-1 at telia dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/85472] Regex match bug
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--- Comment #13 from Hans Ã…berg <haberg-1 at telia dot com> ---
(In reply to Tim Shen from comment #11)
> If you think it's time and space efficiently doable, maybe you can develop a
> prototype first.
I put action number lists on the NFA transitions (no markup of the states). But
then the things I described before work.
Theoretically it may be simplest to start with a NFA with empty (ε)
transitions: For the sub-automatons one is interested in to find matches for,
put a unique action number on the start and final state transitions, marked
begin resp. end match. When compacted to a NFA without empty transitions, which
is what I use, they become lists.
I use bra-ket notation <k|A|k> to indicate the action number k begin-end match
of the automaton A; parentheses indicate grouping. Then the original example
can be written
<1|z|1>(<2|<3|a*|3><4|b*|4><5|c|5>|2>)*
My program then produces the following result, first the NFA, and then the
matches:
ex = (ε ↦ {<1|0}, {
0: {z ↦ {|1><2|<3||3><4||4><5|3, |1><2|<3||3><4|2, |1><2|<3|1, |1>∅}}
1: {a ↦ {1, |3><4|2, |3><4||4><5|3}}
2: {b ↦ {2, |4><5|3}}
3: {c ↦ {|5>|2><2|<3||3><4||4><5|3, |5>|2><2|<3||3><4|2, |5>|2><2|<3|1,
|5>|2>∅}}}, {})
> zaacbbbcac
Full string is a valid match!
Matches: {zaacbbbcac, [@1@4@8@10];
<1|z|1>
<1|z|1> <2|<3|aa|3><4||4><5|c|5>|2>
<1|z|1> <2|<3|aa|3><4||4><5|c|5>|2> <2|<3||3><4|bbb|4><5|c|5>|2>
<1|z|1> <2|<3|aa|3><4||4><5|c|5>|2> <2|<3||3><4|bbb|4><5|c|5>|2>
<2|<3|a|3><4||4><5|c|5>|2>
}
In the first NFA description, transition actions are written after the action
that one pass over. So, for example, the original start state ε ↦ {<1|0} means
that one opens the match <1| to arrive at state 1; then all possibilities in
state 1 closes it with |1>, then opening some other matches.
In the matches description, after the matched string follows, the final state
match string lengths follows, so that eventual empty matches get number 0. The
longest match last then have at the end the sequence
<2|<3|a|3><4||4><5|c|5>|2>
which is what is asked for: #2 "ac, #3 "a", #4 "", #5 "c", in addition to # 1
"z" first.
>From gcc-bugs-return-603173-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 17:09:30 2018
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Subject: [Bug c++/85444] asm specifier on typedef silently ignored
Date: Tue, 01 May 2018 17:09:00 -0000
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--- Comment #8 from Will Hawkins <whh8b at virginia dot edu> ---
Help!
Just wanted to let everyone know that I submitted a patch for this to
gcc-patches and got feedback. However, I need some help!
There's no consensus on the category that should contain this warning. I have
tried two, but neither passed muster from senior developers.
Can anyone suggest a warning category that could be applicable? Thanks!!
>From gcc-bugs-return-603175-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 17:15:05 2018
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Subject: [Bug c++/83258] Rejecting function pointer non-type template parameter without linkage
Date: Tue, 01 May 2018 17:15:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |gufideg at gmail dot com
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 85589 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603177-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 17:15:56 2018
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Subject: [Bug c++/83258] Rejecting function pointer non-type template parameter without linkage
Date: Tue, 01 May 2018 17:15:00 -0000
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Testcase from Bug 85589:
template<auto& v> struct foo {};
int main() {
static auto v = "str";
(void) foo<v> {};
}
>From gcc-bugs-return-603174-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 17:15:04 2018
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Subject: [Bug c++/85589] Non type template parameter should allow object with no linkage
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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> ---
I think this is a dup of PR 83258 so I'll add this testcase there.
*** This bug has been marked as a duplicate of bug 83258 ***
>From gcc-bugs-return-603176-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 17:15:55 2018
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Subject: [Bug target/81805] Another libgomp.c/for-5.c failure on nvptx -- illegal memory access
Date: Tue, 01 May 2018 17:15:00 -0000
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Tom de Vries <vries at gcc dot gnu.org> changed:
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Target| |nvptx
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Component|testsuite |target
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--- Comment #13 from Tom de Vries <vries at gcc dot gnu.org> ---
This test-case is passing with the latest nvidia driver (390.48). Marking
resolved-worksforme.
>From gcc-bugs-return-603178-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 17:17:29 2018
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Subject: [Bug c++/85444] asm specifier on typedef silently ignored
Date: Tue, 01 May 2018 17:17:00 -0000
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--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I don't see an appropriate one, so I'd add a new one.
Maybe the closest is something like -Wignored-attributes but that's not quite
right.
>From gcc-bugs-return-603179-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 17:35:51 2018
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Subject: =?UTF-8?B?W0J1ZyBjKysvODU1ODddIFs4LzkgUmVncmVzc2lvbl0gYm9ndXMgZXJyb3I6?= =?UTF-8?B?IOKAmEbigJkgd2FzIG5vdCBkZWNsYXJlZCBpbiB0aGlzIHNjb3Bl?Date: Tue, 01 May 2018 17:35:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-603180-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 17:39:30 2018
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From: "emsr at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/83140] assoc_legendre returns negated value when m is odd
Date: Tue, 01 May 2018 17:39:00 -0000
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--- Comment #1 from emsr at gcc dot gnu.org ---
Created attachment 44047
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44047&action=edit
This adds a defaulted arg to the underlying __assoc_legendre_p for phase.
2018-05-02 Edward Smith-Rowland <3dw4rd@verizon.net>
PR libstdc++83140 - assoc_legendre returns negated value when m is odd
* include/tr1/legendre_function.tcc (__assoc_legendre_p): Add __phase
argument defaulted to +1. Doxy comments on same.
* testsuite/special_functions/02_assoc_legendre/
check_assoc_legendre.cc: Regenerate.
* testsuite/tr1/5_numerical_facilities/special_functions/
02_assoc_legendre/check_tr1_assoc_legendre.cc: Regenerate.
* testsuite/special_functions/02_assoc_legendre/pr83140.cc: New.
* testsuite/tr1/5_numerical_facilities/special_functions/
02_assoc_legendre/pr83140.cc: New.
>From gcc-bugs-return-603181-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 17:59:42 2018
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Tue, 01 May 2018 17:59:00 -0000
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--- Comment #60 from Andrew Haley <aph at gcc dot gnu.org> ---
(In reply to James Kuyper Jr. from comment #51)
> (In reply to Andrew Haley from comment #49)
> > (In reply to James Kuyper Jr. from comment #46)
> >
> > The principle of type-based alias analysis is that all you know about
> > two types is their types, not the location of any code that uses them.
> > There are no scopes. The oracle, given only the types, has to say
> > whether they alias or not, regardless of where those types are used in
> > a program. The location isn't an input to the oracle.
> >
> > Bear in mind that inlining and other kinds of code motion happen, and
> > code is often evaluated "outside" the scopes in which it was written
> > and in a completely different order. That's all perfectly normal
> > optimization.
> >
> > Besides, when the alias oracle is consulted, all that scope stuff has
> > gone. It's only relevant to the front end.
>
> I was only pointing out that implementing this special guarantee where it
> applies, and only where it applies, requires keeping information that must
> already have been collected. If the current design discards that information
> before performing the relevant optimizations, I can understand that this
> would require a significant re-design - but the re-design takes the form of
> saving information already collected, not of collecting additional
> information.
Well, yes, but this is all stuff we already know. A total redesign of
alias analysis is not going to happen just for this rule.
> > > > So, if any union types with a common initial sequence are declared
> > > > anywhere in a program, then their member types alias.
> > >
> > > As I understand it, the visibility rule was added specifically for
> > > the purpose of NOT requiring that the entire program be covered by
> > > this exception.
> >
> > I don't think so. As I read it, it was a way of declaring to the
> > compiler that they types are intended to alias.
>
> By "the visibility rule", I mean, very specifically, the phrase
> "anywhere that a declaration of the completed type of the union is
> visible". If the intent had been to disable aliasing throughout the
> entire program, that intent could have been expressed by simply
> removing those words entirely; if there was any doubt that people
> would understand the absence of those words correctly, then they
> could have been replaced with the phrase "anywhere, regardless of
> whether or not the completed type of the union was visible". I don't
> see any plausible reason for the committee to write "anywhere that a
> declaration of the completed type of the union is visible", unless
> that phrase was intended to restrict applicability of the special
> guarantee.
And in 1990s compiler technology it might well have been possible to
restrict the effect of this to a single function. Back then it was
commonplace to parse a function, generate code, and then throw
everything except the code away. But compiler technology has moved a
long way since then and it is inevitable that if we are to honour N685
we must coarsen the effect of the visibility of the union.
> > > Knowledgeable people writing code intended to take advantage of this
> > > feature of C are likely to carefully place completed declarations of
> > > the union's type so they disable those optimizations only where they
> > > need to be disabled, and to minimize the amount of code where this
> > > exception would unnecessarily disable useful optimizations.
> >
> > Perhaps so, yes, but in practice it'd be pretty hard to do that.
> > Functions can only be defined in the other scope, and there's no way
> > to undefine a union type.
>
> True, but failing to define the union type is quite trivial. If I were
> writing code that used both struct types, but not the union type, and did
> nothing that relied upon the fact that they can alias each other, I would
> simply not #include the header that defines the completed union type,
> #including only the header that defines the struct types.
That'll be fine if you're only compiling a single translation unit at
a time. If you're using link-time optimization, however, then the
effect of declaring structs in a union will inevitably result in those
structs being treated as aliases for the entire program being linked,
for the simple reason that the alias oracle always returns the same
answer when asked if two types are are aliases. Therefore, if they're
aliases anywhere they must be aliases everywhere.
>From gcc-bugs-return-603182-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 18:06:18 2018
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From: "davmac at davmac dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Tue, 01 May 2018 18:06:00 -0000
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--- Comment #61 from Davin McCall <davmac at davmac dot org> ---
(In reply to James Kuyper Jr. from comment #59)
> (In reply to Davin McCall from comment #56)
> > (In reply to James Kuyper Jr. from comment #55)
> > > The problem is, you're using a statement that the access must occur via a
> > > union, with the implication that the code in question does not access the
> > > member through the union.
> >
> > If "via a union" allows that at some point that the address of a union
> > member was taken and that pointer is then dereferenced, and type punning via
> > a union is allowed (as is implied by another footnote in the same section),
> > then:
>
> Footnote 95 is the only one I can find which allows type punning via a union
> - is that the one you're referring to? Footnote 95 makes absolutely no use
> of the word "via". It says, quite explicitly, "the member used to read the
> contents of a union", and therefore can't apply when not directly using an
> actual member to read it.
Since footnote 95 is a footnote, and therefore non-normative, so actual text
that would limit type punning to only direct union member access would have to
appear in the normative text, but doesn't. In an expression "u.a" where u is a
union object, the result "is an lvalue if" (u) "is an lvalue" (assume for this
example that it is) and also the value is "that of the named member" (a). To
apply the "&" operator to that (as in "&u.a"), then "the result is a pointer to
the object or function designated by its operand". When I then de-reference
that pointer, "the result is an lvalue designating the object", exactly as the
result of the member access operator. When the lvalue is used as per 6.3.2.1 it
is "converted to the value stored in the designated object" which, if it is
referring to a member object, seems to me to be the same as saying that it is
converted to the value "of the named member", as with direct member access.
Since the rest of my points hinged on the idea that is inconsistent to believe
that the clause regarding the common initial sequence applies universally while
type punning requires direct/immediate use of the union, and you disagree with
that tenet, then I don't see a need to go through the other points one by one
and I will let the matter rest unless you would like to discuss it privately
via email (to avoid making even more noise here).
>From gcc-bugs-return-603183-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 18:07:24 2018
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From: "lebedev.ri at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgcc/85591] New: __builtin_cpu_is() is not detecting bdver2 with Model = 0x02
Date: Tue, 01 May 2018 18:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85591
Bug ID: 85591
Summary: __builtin_cpu_is() is not detecting bdver2 with Model
= 0x02
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgcc
Assignee: unassigned at gcc dot gnu.org
Reporter: lebedev.ri at gmail dot com
Target Milestone: ---
$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 2
Core(s) per socket: 4
Socket(s): 1
NUMA node(s): 1
Vendor ID: AuthenticAMD
CPU family: 21
Model: 2
Model name: AMD FX(tm)-8350 Eight-Core Processor
Stepping: 0
CPU MHz: 3787.386
CPU max MHz: 4000.0000
CPU min MHz: 1400.0000
BogoMIPS: 8027.22
Virtualization: AMD-V
L1d cache: 16K
L1i cache: 64K
L2 cache: 2048K
L3 cache: 8192K
NUMA node0 CPU(s): 0-7
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 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c
lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch
osvw ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm topoext perfctr_core
perfctr_nb cpb hw_pstate vmmcall bmi1 arat npt lbrv svm_lock nrip_save
tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold
$ cat /tmp/test.cpp
#include <iostream>
int main (int argc, char* argv[]) {
std::cout << __builtin_cpu_is("bdver2") << " " << __builtin_cpu_is("bdver1")
<< "\n";
return 0;
}
$ g++-8 /tmp/test.cpp
$ ./a.out
0 1
$ echo | gcc-8 -E - -march=native -###
Using built-in specs.
COLLECT_GCC=gcc-8
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 8-20180425-1'
--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 20180425 (experimental) [trunk revision 259628] (Debian
8-20180425-1)
COLLECT_GCC_OPTIONS='-E' '-march=native'
/usr/lib/gcc/x86_64-linux-gnu/8/cc1 -E -quiet -imultiarch x86_64-linux-gnu -
"-march=bdver2" -mmmx -mno-3dnow -msse -msse2 -msse3 -mssse3 -msse4a -mcx16
-msahf -mno-movbe -maes -mno-sha -mpclmul -mpopcnt -mabm -mlwp -mfma -mfma4
-mxop -mbmi -mno-sgx -mno-bmi2 -mno-pconfig -mno-wbnoinvd -mtbm -mavx -mno-avx2
-msse4.2 -msse4.1 -mlzcnt -mno-rtm -mno-hle -mno-rdrnd -mf16c -mno-fsgsbase
-mno-rdseed -mprfchw -mno-adx -mfxsr -mxsave -mno-xsaveopt -mno-avx512f
-mno-avx512er -mno-avx512cd -mno-avx512pf -mno-prefetchwt1 -mno-clflushopt
-mno-xsavec -mno-xsaves -mno-avx512dq -mno-avx512bw -mno-avx512vl
-mno-avx512ifma -mno-avx512vbmi -mno-avx5124fmaps -mno-avx5124vnniw -mno-clwb
-mno-mwaitx -mno-clzero -mno-pku -mno-rdpid -mno-gfni -mno-shstk
-mno-avx512vbmi2 -mno-avx512vnni -mno-vaes -mno-vpclmulqdq -mno-avx512bitalg
-mno-movdiri -mno-movdir64b --param "l1-cache-size=16" --param
"l1-cache-line-size=64" --param "l2-cache-size=2048" "-mtune=bdver2"
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/8/:/usr/lib/gcc/x86_64-linux-gnu/8/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/8/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/8/:/usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/8/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/8/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-E' '-march=native'
So the `-march=native` detects it properly, but not the builtins.
The LLVM/clang side with patches is on https://reviews.llvm.org/D46314
https://reviews.llvm.org/D46323
Basically, this is as simple as accepting not only the `(Model >= 0x10 && Model
<= 0x1f)` but also `Model == 0x02`.
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Subject: =?UTF-8?B?W0J1ZyBjKysvODU1ODddIFs4LzkgUmVncmVzc2lvbl0gYm9ndXMgZXJyb3I6?= =?UTF-8?B?IOKAmEbigJkgd2FzIG5vdCBkZWNsYXJlZCBpbiB0aGlzIHNjb3Bl?Date: Tue, 01 May 2018 18:12:00 -0000
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--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Tue May 1 18:11:53 2018
New Revision: 259805
URL: https://gcc.gnu.org/viewcvs?rev=259805&root=gcc&view=rev
Log:
PR c++/85587 - error with scoped enum in template.
* semantics.c (finish_qualified_id_expr): Don't return an
unqualified IDENTIFIER_NODE.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/scoped_enum8.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/semantics.c
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Subject: [Bug tree-optimization/82665] missing value range optimization for memchr
Date: Tue, 01 May 2018 18:21:00 -0000
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--- Comment #3 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Tue May 1 18:20:39 2018
New Revision: 259806
URL: https://gcc.gnu.org/viewcvs?rev=259806&root=gcc&view=rev
Log:
PR tree-optimization/82665
* vr-values.c (vr_values::extract_range_from_binary_expr): Handle
pointer subtraction where arguments come from a memchr call.
PR tree-optimization/82665
* gcc.dg/tree-ssa/pr82665.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr82665.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/vr-values.c
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Subject: [Bug tree-optimization/82665] missing value range optimization for memchr
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82665
Jeffrey A. Law <law at redhat dot com> changed:
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----------------------------------------------------------------------------
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CC| |law at redhat dot com
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--- Comment #4 from Jeffrey A. Law <law at redhat dot com> ---
Fixed on the trunk.
>From gcc-bugs-return-603187-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 18:30:26 2018
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From: "timshen at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/85472] Regex match bug
Date: Tue, 01 May 2018 18:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85472
--- Comment #14 from Tim Shen <timshen at gcc dot gnu.org> ---
How fast does your prototype run on the following example?
((10)|(11)|(12)|...|(98)|(99))* matching "10111213141516...9899"
how about this:
((100)|(101)|(102)|...|(998)|(999))* matching "100101102...998999"
where "..." are the skipped strings that follow the surrounding pattern.
For the record, for the 100-999 case, libstdc++ takes 0.112 seconds given a
proper stack limit. libc++ takes 6.386 seconds.
I have a C++ test case for this:
#include <regex>
#include <string>
#include <iostream>
constexpr int kStart = 100;
constexpr int kEnd = 1000;
int main() {
std::regex re;
{
std::string re_string;
re_string += '(';
re_string += std::string("(") + std::to_string(kStart) + ")";
for (int i = kStart + 1; i < kEnd; i++) {
re_string += '|';
re_string += '(';
re_string += std::to_string(i);
re_string += ')';
}
re_string += ')';
re_string += '*';
re.assign(re_string);
}
std::string s;
for (int i = kStart; i < kEnd; i++) {
s += std::to_string(i);
}
std::smatch m;
std::cout << std::regex_match(s, m, re) << "\n";
for (const auto p : m) {
std::cout << p << " ";
}
std::cout << "\n";
return 0;
}
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Subject: [Bug tree-optimization/85588] [6/7/8/9 Regression] -fwrapv miscompilation
Date: Tue, 01 May 2018 18:31:00 -0000
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r229484.
>From gcc-bugs-return-603189-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 18:37:42 2018
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Subject: [Bug libstdc++/80506] Wrong magic number in std::gamma_distribution
Date: Tue, 01 May 2018 18:37:00 -0000
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--- Comment #3 from emsr at gcc dot gnu.org ---
I'm now of the opinion that we should push these down.
At least gcc-7.
That's what I'm doing with the specfun bits.
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Subject: [Bug c/85465] [og7, openacc] ICE in mark_vars_oacc_gangprivate, at c/c-parser.c:14213
Date: Tue, 01 May 2018 18:42:00 -0000
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--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=b5146f735883031f6661dda1d3ee9a34ad557e52
[c, openacc] Handle non-var-decl in mark_vars_oacc_gangprivate
2018-05-01 Tom de Vries <tom@codesourcery.com>
PR target/85465
* c-parser.c (mark_vars_oacc_gangprivate): Skip BLOCK_VARS that are not
VAR_DECL.
* testsuite/libgomp.oacc-c/pr85465.c: New test.
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Subject: [Bug c/85465] [og7, openacc] ICE in mark_vars_oacc_gangprivate, at c/c-parser.c:14213
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Tom de Vries <vries at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Patch with test-case committed, marking resolved-fixed.
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Subject: [Bug target/85592] New: __builtin_cpu_is does not exist on aarch64
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85592
Bug ID: 85592
Summary: __builtin_cpu_is does not exist on aarch64
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
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Target: aarch64-*-*
__builtin_cpu_is should be supported for aarch64; just like PowerPC and x86.
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Subject: [Bug target/85592] __builtin_cpu_is does not exist on aarch64
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug target/85592] __builtin_cpu_is and __builtin_cpu_supports should be supported for aarch64
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|__builtin_cpu_is does not |__builtin_cpu_is and
|exist on aarch64 |__builtin_cpu_supports
| |should be supported for
| |aarch64
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
__builtin_cpu_supports should be supported also.
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Subject: [Bug libstdc++/85472] Regex match bug
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--- Comment #15 from Hans Ã…berg <haberg-1 at telia dot com> ---
(In reply to Tim Shen from comment #14)
> How fast does your prototype run on the following example?
> ((10)|(11)|(12)|...|(98)|(99))* matching "10111213141516...9899"
> how about this:
> ((100)|(101)|(102)|...|(998)|(999))* matching "100101102...998999"
>
> where "..." are the skipped strings that follow the surrounding pattern.
My program does not choke on limit cases, like the regex '(a?)^k a^k' on the
string string "a"^k, mentioned at [1]; for k = 100, it takes 0.393 s on the NFA
and 0.168 on the DFA on a not so powerful computer. Otherwise, it is not
optimized and fast in absolute terms: I use standard C++ containers such as
unordered_set for DFA state lookups, and not a number.
1. https://swtch.com/~rsc/regexp/regexp1.html
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Subject: [Bug c/84258] Bogus -Wformat warning "wide character string" for const unsigned char
Date: Tue, 01 May 2018 18:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84258
--- Comment #5 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Author: dmalcolm
Date: Tue May 1 18:51:15 2018
New Revision: 259807
URL: https://gcc.gnu.org/viewcvs?rev=259807&root=gcc&view=rev
Log:
-Wformat: fix nonsensical "wide character" message (PR c/84258)
gcc/c-family/ChangeLog:
PR c/84258
* c-format.c (struct format_check_results): Add field
"number_non_char".
(check_format_info): Initialize it, and warn if encountered.
(check_format_arg): Distinguish between wide char and
everything else when detecting arrays of non-char.
gcc/testsuite/ChangeLog:
PR c/84258
* c-c++-common/Wformat-pr84258.c: New test.
Added:
trunk/gcc/testsuite/c-c++-common/Wformat-pr84258.c
Modified:
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c-format.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c/84258] Bogus -Wformat warning "wide character string" for const unsigned char
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Fixed for gcc 9 by r259807.
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From: "austinpmorton at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug inline-asm/85593] New: GCC on ARM allocates R3 for local variable when calling naked function with O2 optimizations enabled
Date: Tue, 01 May 2018 19:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85593
Bug ID: 85593
Summary: GCC on ARM allocates R3 for local variable when
calling naked function with O2 optimizations enabled
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Created attachment 44048
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44048&action=edit
example code triggering bug
When calling a naked function declared in the same translation unit which
includes inline assembly that modifies registers which are not preserved across
function calls according to the arm abi (R0-R3), GCC 5+ can incorrectly
allocate these registers for local variables in the caller and expect them to
persist between function calls.
* -O2 must be enabled to observe this behavior.
* the function must be declared in the same translation unit, if declared
extern gcc correctly allocates preserved registers for its locals
* GCC 4.6.4 correctly allocates R4 in the example code given
* GCC 5.4, and all higher versions tested incorrectly allocates R3 in the
example code given
* I have built a clean copy of GCC trunk and observed this issue as well
note: this issue is present on all arm triplets I have tested, not just
arm-none-eabi.
compile bug.c with the following options to observe the bug
arm-none-eabi-gcc -O2 -DBUG -S bug.c -o -
compile bug.c with the following options to observe the correct behavior with
an extern declaration
arm-none-eabi-gcc -O2 -S bug.c -o -
note that in the non-working compiler versions gcc attempts to load a value
from r3 between calls to test2, whereas in the working compiler versions gcc
will produce identical code save for using r4.
for convenience sake, here is the example shown in working vs nonworking
compiler versions on godbolt:
https://godbolt.org/g/kMSn8W
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From: "timshen at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/85472] Regex match bug
Date: Tue, 01 May 2018 19:10:00 -0000
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--- Comment #16 from Tim Shen <timshen at gcc dot gnu.org> ---
(In reply to Hans Ã…berg from comment #15)
> (In reply to Tim Shen from comment #14)
> > How fast does your prototype run on the following example?
> > ((10)|(11)|(12)|...|(98)|(99))* matching "10111213141516...9899"
> > how about this:
> > ((100)|(101)|(102)|...|(998)|(999))* matching "100101102...998999"
> >
> > where "..." are the skipped strings that follow the surrounding pattern.
>
> My program does not choke on limit cases, like the regex '(a?)^k a^k' on the
> string string "a"^k, mentioned at [1]; for k = 100, it takes 0.393 s on the
> NFA and 0.168 on the DFA on a not so powerful computer. Otherwise, it is not
> optimized and fast in absolute terms: I use standard C++ containers such as
> unordered_set for DFA state lookups, and not a number.
>
> 1. https://swtch.com/~rsc/regexp/regexp1.html
Sorry, I meant to observe whether the example triggers a O(k^2) behavior. It
should be less than quadratic. To measure this, you don't have to compare the
time of your prototype against libstdc++.
I set (kStart, kEnd) to be (1000, 2000), (1000, 3000), ..., (1000, 9000) to see
how the time grows. I changed my pattern a bit to make it k lg k. I'm more
curious about the time complexity your program takes, as I was not able to
understand your algorithm description.
Here are my numbers for end ranging 2000 to 9000, in ms:
[79,150,262,427,620,868,1078,1310].
The difference array: [71, 112, 165, 193, 248, 210, 232].
I think it's vaguely k lg k, but I'm not quite sure yet.
Here is the updated example, to re-arrange the expression to a tree, not a
chain of "|" operators.
#include <regex>
#include <string>
#include <iostream>
#include <cstdlib>
#include <cassert>
void gen_pattern(int start, int end, std::string& acc) {
if (!(start < end)) {
std::abort();
}
if (start + 1 == end) {
acc += '(';
acc += std::to_string(start);
acc += ')';
return;
}
int mid = (start + end) / 2;
if (start + 1 == mid) {
gen_pattern(start, mid, acc);
} else {
acc += "(?:";
gen_pattern(start, mid, acc);
acc += ")";
}
acc += "|";
if (mid + 1 == end) {
gen_pattern(mid, end, acc);
} else {
acc += "(?:";
gen_pattern(mid, end, acc);
acc += ")";
}
}
int main(int argc, char** argv) {
if (argc < 3) {
std::abort();
}
int start = atoi(argv[1]);
int end = atoi(argv[2]);
std::regex re;
{
std::string pattern;
gen_pattern(start, end, pattern);
re.assign("(" + pattern + ")*");
}
std::string s;
for (int i = start; i < end; i++) {
s += std::to_string(i);
}
std::smatch m;
std::cout << std::regex_match(s, m, re) << "\n";
//for (const auto p : m) {
// std::cout << p << " ";
//}
//std::cout << "\n";
return 0;
}
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85593] GCC on ARM allocates R3 for local variable when calling naked function with O2 optimizations enabled
Date: Tue, 01 May 2018 19:12:00 -0000
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I don't think naked function are supposed to be called directly.
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/83786] Add VEC_ORDERED_REMOVE_IF
Date: Tue, 01 May 2018 19:17:00 -0000
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--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Tue May 1 19:16:43 2018
New Revision: 259808
URL: https://gcc.gnu.org/viewcvs?rev=259808&root=gcc&view=rev
Log:
Add VEC_ORDERED_REMOVE_IF
2018-05-01 Tom de Vries <tom@codesourcery.com>
PR other/83786
* vec.h (VEC_ORDERED_REMOVE_IF, VEC_ORDERED_REMOVE_IF_FROM_TO): Define.
* vec.c (test_ordered_remove_if): New function.
(vec_c_tests): Call test_ordered_remove_if.
* dwarf2cfi.c (connect_traces): Use VEC_ORDERED_REMOVE_IF_FROM_TO.
* lto-streamer-out.c (prune_offload_funcs): Use VEC_ORDERED_REMOVE_IF.
* tree-vect-patterns.c (vect_pattern_recog_1): Use
VEC_ORDERED_REMOVE_IF.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2cfi.c
trunk/gcc/lto-streamer-out.c
trunk/gcc/tree-vect-patterns.c
trunk/gcc/vec.c
trunk/gcc/vec.h
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85593] GCC on ARM allocates R3 for local variable when calling naked function with O2 optimizations enabled
Date: Tue, 01 May 2018 19:19:00 -0000
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--- Comment #2 from Austin Morton <austinpmorton at gmail dot com> ---
Where is this limitation documented? The GCC documentation on the naked
function attribute makes no mention of such a caveat:
https://gcc.gnu.org/onlinedocs/gcc/ARM-Function-Attributes.html
See here for real world usage that triggers this issue:
https://git.kernel.org/pub/scm/bluetooth/sbc.git/tree/sbc/sbc_primitives_armv6.c
Note that I am not the original author of the above code, just someone who ran
into issues attempting to use it on gcc newer than 4.x
In this specific case it is simple enough to fix by pushing r3, but it seemed
like a bug with the compiler, considering the behavior changed between major
releases.
If this is indeed an issue with the code itself and not the compiler, that is
fine, but it should certainly be documented that naked functions are not meant
to be called directly.
>From gcc-bugs-return-603203-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 19:19:46 2018
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Subject: [Bug other/83786] Add VEC_ORDERED_REMOVE_IF
Date: Tue, 01 May 2018 19:19:00 -0000
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Assignee|unassigned at gcc dot gnu.org |vries at gcc dot gnu.org
Target Milestone|--- |9.0
--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
Patch committed, marking resolved-fixed.
>From gcc-bugs-return-603204-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 19:35:28 2018
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From: "whh8b at virginia dot edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85444] asm specifier on typedef silently ignored
Date: Tue, 01 May 2018 19:35:00 -0000
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--- Comment #10 from Will Hawkins <whh8b at virginia dot edu> ---
Thanks for the feedback! I tried ignored-attributes but Mr. Meyers said that
was not an appropriate match. I think that I am going to have to go with adding
a completely separate category. This will be good practice for handling PR
44209.
Thanks again for the feedback!
>From gcc-bugs-return-603205-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 19:40:47 2018
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Subject: [Bug rtl-optimization/85594] New: ICE during expand when compiling with -fwrapv -fopenmp
Date: Tue, 01 May 2018 19:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85594
Bug ID: 85594
Summary: ICE during expand when compiling with -fwrapv -fopenmp
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
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Compiling gcc/testsuite/gcc.dg/gomp/pr81768-2.c with "-fwrapv -fopenmp" fails
with an ICE:
> gcc -S -fwrapv -fopenmp pr81768-2.c
during RTL pass: expand
../pr81768-2.c: In function 'foo._omp_fn.1':
../pr81768-2.c:10:9: internal compiler error: in make_decl_rtl, at
varasm.c:1322
#pragma omp target parallel for schedule(static, 32) collapse(3)
^~~
0x5d230c make_decl_rtl(tree_node*)
../../gcc/gcc/varasm.c:1318
0x7c79bc expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
../../gcc/gcc/expr.c:9965
0x7d05de expand_expr
../../gcc/gcc/expr.h:280
0x7d05de expand_expr_addr_expr_1
../../gcc/gcc/expr.c:7946
0x7d0465 expand_expr_addr_expr_1
../../gcc/gcc/expr.c:7992
0x7c698d expand_expr_addr_expr
../../gcc/gcc/expr.c:8067
0x7c698d expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
../../gcc/gcc/expr.c:11239
0x7433a0 expand_normal
../../gcc/gcc/expr.h:286
0x7433a0 do_compare_and_jump
../../gcc/gcc/dojump.c:1196
0x744253 do_jump_1(tree_code, tree_node*, tree_node*, rtx_code_label*,
rtx_code_label*, profile_probability)
../../gcc/gcc/dojump.c:261
0x6dc3cc expand_gimple_cond
../../gcc/gcc/cfgexpand.c:2495
0x6dc3cc expand_gimple_basic_block
../../gcc/gcc/cfgexpand.c:5674
0x6dff66 execute
../../gcc/gcc/cfgexpand.c:6425
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-603206-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 19:44:24 2018
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Subject: [Bug libstdc++/85472] Regex match bug
Date: Tue, 01 May 2018 19:44:00 -0000
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--- Comment #17 from Hans Ã…berg <haberg-1 at telia dot com> ---
(In reply to Tim Shen from comment #16)
> (In reply to Hans Ã…berg from comment #15)
> > (In reply to Tim Shen from comment #14)
> > > How fast does your prototype run on the following example?
> > > ((10)|(11)|(12)|...|(98)|(99))* matching "10111213141516...9899"
> > > how about this:
> > > ((100)|(101)|(102)|...|(998)|(999))* matching "100101102...998999"
> > >
> > > where "..." are the skipped strings that follow the surrounding pattern.
> >
> > My program does not choke on limit cases, like the regex '(a?)^k a^k' on the
> > string string "a"^k, mentioned at [1]; for k = 100, it takes 0.393 s on the
> > NFA and 0.168 on the DFA on a not so powerful computer. Otherwise, it is not
> > optimized and fast in absolute terms: I use standard C++ containers such as
> > unordered_set for DFA state lookups, and not a number.
> >
> > 1. https://swtch.com/~rsc/regexp/regexp1.html
>
> Sorry, I meant to observe whether the example triggers a O(k^2) behavior. It
> should be less than quadratic. To measure this, you don't have to compare
> the time of your prototype against libstdc++.
I'll have to get back on this. But it shouldn't choke:
During the lexing, I just record the DFA states as function of the string
positions. When a final state appears, the reverse NFA data can be used to
compute the NFA states this match actually uses, and therefore, as the
characters are known, also the NFA transitions, and any data that depends on
it.
>From gcc-bugs-return-603207-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 19:53:38 2018
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Subject: [Bug lto/85451] [offloading] Improve lto-wrapper error message when not finding mkoffload
Date: Tue, 01 May 2018 19:53:00 -0000
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--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Tue May 1 19:52:57 2018
New Revision: 259809
URL: https://gcc.gnu.org/viewcvs?rev=259809&root=gcc&view=rev
Log:
[nvptx] Improve "offload compiler not found" message in mkoffload
2018-05-01 Tom de Vries <tom@codesourcery.com>
PR lto/85451
* config/nvptx/mkoffload.c (main): Suggest using -B in "offload
compiler
not found" error message.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/nvptx/mkoffload.c
>From gcc-bugs-return-603208-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 19:59:26 2018
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Subject: [Bug libstdc++/85472] Regex match bug
Date: Tue, 01 May 2018 19:59:00 -0000
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--- Comment #18 from Hans Ã…berg <haberg-1 at telia dot com> ---
(In reply to Tim Shen from comment #14)
> I have a C++ test case for this:
I get segmentation fault on the regex_match line with g++ 7.3.0.
>From gcc-bugs-return-603209-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:05:10 2018
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Subject: [Bug target/85595] New: __atomic_is_lock_free(sizeof(unsigned long long), &v) returns true on i686
Date: Tue, 01 May 2018 20:05:00 -0000
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Bug ID: 85595
Summary: __atomic_is_lock_free(sizeof(unsigned long long), &v)
returns true on i686
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
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in gcc __atomic_is_lock_free(sizeof(unsigned long long), &v) returns true (in
clang it is left as a call)
int main()
{
unsigned long long v;
if (__atomic_is_lock_free(sizeof(unsigned long long), &v))
return 0;
else
return 1;
}
> g++ -O2 -m32 -std=gnu++11 -fno-exceptions -fno-rtti
main:
.LFB0:
xorl %eax, %eax
ret
> clang++ -O2 -m32 -std=gnu++11 -fno-exceptions -fno-rtti
main: # @main
.Lfunc_begin0:
# %bb.0:
subl $12, %esp
.Ltmp0:
subl $8, %esp
leal 8(%esp), %eax
pushl %eax
pushl $8
calll __atomic_is_lock_free
addl $16, %esp
xorl %ecx, %ecx
testl %eax, %eax
sete %cl
.Ltmp1:
movl %ecx, %eax
addl $12, %esp
retl
__atomic_is_lock_free always should return false for misaligned pointers (long
long is only 4-byte aligned on i686)
More details can be found at the bug filed against llvm
https://bugs.llvm.org/show_bug.cgi?id=36860
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Subject: [Bug libstdc++/85472] Regex match bug
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--- Comment #19 from Hans Ã…berg <haberg-1 at telia dot com> ---
(In reply to Tim Shen from comment #16)
> I set (kStart, kEnd) to be (1000, 2000), (1000, 3000), ..., (1000, 9000) to
> see how the time grows. ...
> Here are my numbers for end ranging 2000 to 9000, in ms:
> [79,150,262,427,620,868,1078,1310].
I get segmentation fault beyond 4000, but for this value, it takes 1.130 s, so
your computer is about 4 times faster it seems.
>From gcc-bugs-return-603211-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:14:03 2018
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Subject: [Bug target/85595] __atomic_is_lock_free(sizeof(unsigned long long), &v) returns true on i686
Date: Tue, 01 May 2018 20:14:00 -0000
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
That does not mean the local variable is not aligned to 8 bytes ...
>From gcc-bugs-return-603212-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:15:36 2018
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Subject: [Bug libstdc++/85472] Regex match bug
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--- Comment #20 from Tim Shen <timshen at gcc dot gnu.org> ---
(In reply to Hans Ã…berg from comment #18)
> (In reply to Tim Shen from comment #14)
> > I have a C++ test case for this:
>
> I get segmentation fault on the regex_match line with g++ 7.3.0.
On Linux I set "ulimit -s unlimited". The stack overflow is a known issue
because the implementation is recursive.
>From gcc-bugs-return-603214-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:22:59 2018
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Subject: [Bug lto/85451] [offloading] Improve lto-wrapper error message when not finding mkoffload
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2018-05/msg00044.html
>From gcc-bugs-return-603213-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:22:44 2018
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Subject: [Bug target/85596] New: aarch64 --with-multilib-list documentation missing
Date: Tue, 01 May 2018 20:22:00 -0000
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Bug ID: 85596
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config.gcc has aarch64 support for the --with-multilib-list option, but it
isn't documented in the doc/install.texi file.
>From gcc-bugs-return-603215-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:23:52 2018
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Subject: [Bug target/85595] __atomic_is_lock_free(sizeof(unsigned long long), &v) returns true on i686
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Alexander Ivchenko from comment #0)
> (long long is only 4-byte aligned on i686)
Not when it's placed on the stack. GCC will always align the variable in your
example to 8 bytes. But a better example shows that __atomic_is_lock_free does
still return true for objects aligned to 4 bytes.
>From gcc-bugs-return-603216-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:25:04 2018
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Subject: [Bug c++/81420] When a reference is bound to a member in the base of a temporary, lifetime of the temporary is not extended
Date: Tue, 01 May 2018 20:25:00 -0000
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Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2018-01-08 00:00:00 |2018-5-1
--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
Yes, this lifetime extension mechanism seems super fragile in gcc. Binding to a
base fails, binding to an array element fails
int d;
struct A
{
int i[2];
~A() { ++d; };
};
int main()
{
// int&&r = A().i[0];
const int &r = A().i[0];
if (d != 0)
__builtin_abort();
}
even a regular member fails if referenced with a slightly different syntax (bug
53288).
>From gcc-bugs-return-603217-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:26:10 2018
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Subject: [Bug libstdc++/85472] Regex match bug
Date: Tue, 01 May 2018 20:26:00 -0000
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--- Comment #21 from Hans Ã…berg <haberg-1 at telia dot com> ---
(In reply to Tim Shen from comment #20)
> (In reply to Hans Ã…berg from comment #18)
> > (In reply to Tim Shen from comment #14)
> > > I have a C++ test case for this:
> >
> > I get segmentation fault on the regex_match line with g++ 7.3.0.
>
> On Linux I set "ulimit -s unlimited".
On MacOS, I can change the value, default 8192, but not to unlimited.
> The stack overflow is a known issue
> because the implementation is recursive.
I have a loop, as in Flex and Bison generated parsers.
>From gcc-bugs-return-603218-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:35:31 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85597] New: internal compiler error: in compute_live_loop_exits, at tree-ssa-loop-manip.c:229
Date: Tue, 01 May 2018 20:35:00 -0000
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Bug ID: 85597
Summary: internal compiler error: in compute_live_loop_exits,
at tree-ssa-loop-manip.c:229
Product: gcc
Version: 9.0
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Target: x86_64-pc-linux-gnu
gcc version 9.0.0 20180501 (experimental) (GCC)
$ cat q.c
extern double fma (double, double, double);
static inline void
bar (int i, double *D, double *S)
{
while (i-- > 0)
{
D[0] = fma (1, S[0], D[0]);
D[1] = fma (1, S[1], D[1]);
D[2] = fma (1, S[2], D[2]);
D[3] = fma (1, S[3], D[3]);
D += 4;
S += 4;
}
}
void
foo (double *d, double *s)
{
bar (10, d, s);
}
$ ./cc1 -quiet q.c -O3 -mfma
during GIMPLE pass: vect
q.c: In function ‘foo’:
q.c:18:1: internal compiler error: in compute_live_loop_exits, at
tree-ssa-loop-manip.c:229
foo (double *d, double *s)
^~~
0x11872fa compute_live_loop_exits
/home/mpolacek/src/gcc/gcc/tree-ssa-loop-manip.c:229
0x1187708 add_exit_phis_var
/home/mpolacek/src/gcc/gcc/tree-ssa-loop-manip.c:316
0x1187826 add_exit_phis
/home/mpolacek/src/gcc/gcc/tree-ssa-loop-manip.c:338
0x1188327 rewrite_into_loop_closed_ssa_1(bitmap_head*, unsigned int, int,
loop*)
/home/mpolacek/src/gcc/gcc/tree-ssa-loop-manip.c:660
0x1188380 rewrite_into_loop_closed_ssa(bitmap_head*, unsigned int)
/home/mpolacek/src/gcc/gcc/tree-ssa-loop-manip.c:681
0x13003b0 vectorize_loops()
/home/mpolacek/src/gcc/gcc/tree-vectorizer.c:853
0x11a70b1 execute
/home/mpolacek/src/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-603219-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:36:54 2018
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Subject: [Bug tree-optimization/85597] internal compiler error: in compute_live_loop_exits, at tree-ssa-loop-manip.c:229
Date: Tue, 01 May 2018 20:36:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r250811.
>From gcc-bugs-return-603220-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:40:54 2018
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From: "thomas.mercier.jr at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85598] New: Incorrect warning only at -O2 and -O3
Date: Tue, 01 May 2018 20:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85598
Bug ID: 85598
Summary: Incorrect warning only at -O2 and -O3
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: thomas.mercier.jr at gmail dot com
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Created attachment 44049
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44049&action=edit
Preprocessed file of program that reproduces the behavior
$ gcc -v
Using built-in specs.
COLLECT_GCC=x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/brazil-pkg-cache/packages/GCC/GCC-7.x.200154.0/AL2012/DEV.STD.PTHREAD/build/gcc-7.3.0/bin/../libexec/gcc/x86_64-pc-linux-gnu/7.3.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/local/p4clients/pkgbuild-Kfsa6/workspace/src/GCC/build/private/src/gcc-7.3.0/configure
--prefix=/local/p4clients/pkgbuild-Kfsa6/workspace/src/GCC/build/gcc-7.3.0
--enable-languages=c,c++,fortran --disable-plugin
--with-build-config=bootstrap-lto
--with-gmp=/local/p4clients/pkgbuild-Kfsa6/workspace/src/GCC/build/private/stage2
--with-mpfr=/local/p4clients/pkgbuild-Kfsa6/workspace/src/GCC/build/private/stage2
--with-mpc=/local/p4clients/pkgbuild-Kfsa6/workspace/src/GCC/build/private/stage2
--with-fpmath=sse --with-cpu-64=core2 --disable-multilib --disable-bootstrap
--with-glibc-version=2.12
--with-cloog=/local/p4clients/pkgbuild-Kfsa6/workspace/src/GCC/build/private/stage2
--with-ppl=/local/p4clients/pkgbuild-Kfsa6/workspace/src/GCC/build/private/stage2
--with-isl=/local/p4clients/pkgbuild-Kfsa6/workspace/src/GCC/build/private/stage2
--enable-libsanitizer --disable-stage1-checking
Thread model: posix
gcc version 7.3.0 (GCC)
When compiled with -O2 or -O3 optimization enabled, the following warning is
printed:
$ gcc -Wall -O2 /tmp/test.c
/tmp/test.c: In function ‘main’:
/tmp/test.c:9:31: warning: ‘snprintf’ output may be truncated before the last
format character [-Wformat-truncation=]
snprintf(str, 4, "%%%02X", x);
^
/tmp/test.c:9:7: note: ‘snprintf’ output between 4 and 5 bytes into a
destination of size 4
snprintf(str, 4, "%%%02X", x);
~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
With lesser levels of optimization, no warning is printed:
$ gcc -Wall -O1 /tmp/test.c
$
This is the entire program (preprocessed attached):
#include <stdio.h>
int main()
{
char temp[100];
unsigned int x;
char *str = temp;
for(x=0; x<256; ++x) {
snprintf(str, 4, "%%%02X", x);
}
}
Calling snprintf with NULL and 0 for the first two arguments returns 3 for all
values of the loop. I believe the correct behavior from GCC is no warning at
any optimization level.
>From gcc-bugs-return-603221-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:50:20 2018
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From: "janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85599] New: invalid optimization: function not always evaluated in logical expression
Date: Tue, 01 May 2018 20:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85599
Bug ID: 85599
Summary: invalid optimization: function not always evaluated in
logical expression
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Consider the following test case:
program lazy
logical :: flag
flag = .false.
flag = check() .and. flag ! 'check' is executed as expected
flag = flag .and. check() ! bug: 'check' is not executed
contains
logical function check()
integer, save :: i = 1
print *, "check", i
i = i + 1
check = .true.
end function
end
The problem here is that gfortran executes the function 'check' only once,
although it should be executed twice AFAICS.
Optimizing out the function call might be valid for a PURE function, but for an
impure one with side effects, I don't think this is allowed.
Both ifort and flang execute the function twice. For gfortran, the optimization
level does not seem to influence the result: -O0 and -O3 behave in the same
way.
I tried with gfortran versions 5, 6, 7 and 8, which all exhibit the same buggy
behavior.
>From gcc-bugs-return-603222-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:51:38 2018
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Subject: [Bug libgomp/83792] [openacc] Factor out async argument utility functions
Date: Tue, 01 May 2018 20:51:00 -0000
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--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
pinged: https://gcc.gnu.org/ml/gcc-patches/2018-05/msg00046.html
>From gcc-bugs-return-603223-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 20:56:59 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 tree-optimization/85597] [6/7/8/9 Regression] internal compiler error: in compute_live_loop_exits, at tree-ssa-loop-manip.c:229
Date: Tue, 01 May 2018 20:56:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |6.5
Summary|internal compiler error: in |[6/7/8/9 Regression]
|compute_live_loop_exits, at |internal compiler error: in
|tree-ssa-loop-manip.c:229 |compute_live_loop_exits, at
| |tree-ssa-loop-manip.c:229
>From gcc-bugs-return-603224-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 21:04:38 2018
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Subject: [Bug fortran/85599] invalid optimization: function not always evaluated in logical expression
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janus at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Target Milestone|--- |9.0
>From gcc-bugs-return-603225-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 21:11:15 2018
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Subject: [Bug c++/81420] When a reference is bound to a member in the base of a temporary, lifetime of the temporary is not extended
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--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
Created attachment 44050
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44050&action=edit
untested hackish patch
This seems to help a bit, but it doesn't feel like the right approach.
>From gcc-bugs-return-603226-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 21:13:34 2018
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From: "pthaugen at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85600] New: CPU2006 471.omnetpp fails starting with r259771
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Bug ID: 85600
Summary: CPU2006 471.omnetpp fails starting with r259771
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Benchmark is failing at runtime, emitting following message at the end before
exiting with rc=1.
** Event #0 T=0.0000000 ( 0.00s)
Messages: created: 77472
** Event #5000000 T=0.0868274600 ( 86ms)
Messages: created: 3949482
** Event #10000000 T=0.1605411650 (160ms)
Messages: created: 7854099
<!> Error in module largeNet.llanBB[48].bhost[3].mac:
(cQueue)largeNet.llanBB[48].bhost[3].mac.class-members.outputBuffer: pop():
queue empty.
End run of OMNeT++
>From gcc-bugs-return-603227-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 21:19:24 2018
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Subject: [Bug c++/85600] CPU2006 471.omnetpp fails starting with r259771
Date: Tue, 01 May 2018 21:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85600
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Does adding -fno-lifetime-dse help? This could be a bug in the omnetpp sources
...
>From gcc-bugs-return-603228-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 21:35:41 2018
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From: "pthaugen at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85600] CPU2006 471.omnetpp fails starting with r259771
Date: Tue, 01 May 2018 21:35:00 -0000
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--- Comment #2 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> Does adding -fno-lifetime-dse help? This could be a bug in the omnetpp
> sources ...
Nope, still fails.
471.omnetpp: copy 0 non-zero return code (exit code=1, signal=0)
>From gcc-bugs-return-603229-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 21:41:43 2018
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Subject: [Bug tree-optimization/85143] Loop limit prevents (auto)vectorization
Date: Tue, 01 May 2018 21:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85143
--- Comment #6 from Marc Glisse <glisse at gcc dot gnu.org> ---
Author: glisse
Date: Tue May 1 21:41:05 2018
New Revision: 259812
URL: https://gcc.gnu.org/viewcvs?rev=259812&root=gcc&view=rev
Log:
Generalize a<b&a<c -> a<min(b,c)
2018-05-01 Marc Glisse <marc.glisse@inria.fr>
PR tree-optimization/85143
gcc/
* match.pd (A<B&A<C): Extend to BIT_IOR_EXPR.
gcc/testsuite/
* gcc.dg/tree-ssa/minmax-loopend.c: Extend and split...
* gcc.dg/tree-ssa/minmax-loopend-2.c: ... here.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/minmax-loopend-2.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/match.pd
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/tree-ssa/minmax-loopend.c
>From gcc-bugs-return-603230-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 21:54:31 2018
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Subject: [Bug lto/85574] [9 Regression] LTO bootstapped binaries differ
Date: Tue, 01 May 2018 21:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85574
Jan Hubicka <hubicka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-01
Ever confirmed|0 |1
--- Comment #3 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
I've tried bootstrap with -flto-partition=none and also get differences in
gengtype and cc1, so it seems to be unrealated to partitioning change. First
bigger one is:
@@ -2875,506 +2875,507 @@
40444b: 48 89 05 6e 64 02 00 mov %rax,0x2646e(%rip) #
42a8c0 <gt_files>
404452: 31 ff xor %edi,%edi
404454: 44 39 2d 15 65 02 00 cmp %r13d,0x26515(%rip) #
42a970 <num_gt_files>
- 40445b: 7e 49 jle 4044a6 <main+0x22b6>
+ 40445b: 7e 4e jle 4044ab <main+0x22bb>
40445d: e8 de 37 01 00 callq 417c40 <_ZL16peek_state_tokeni>
404462: bf 01 00 00 00 mov $0x1,%edi
- 404467: 49 89 c6 mov %rax,%r14
- 40446a: e8 d1 37 01 00 callq 417c40 <_ZL16peek_state_tokeni>
- 40446f: bf 02 00 00 00 mov $0x2,%edi
- 404474: 48 89 c5 mov %rax,%rbp
- 404477: e8 c4 37 01 00 callq 417c40 <_ZL16peek_state_tokeni>
....
+ 404467: 49 89 c7 mov %rax,%r15
+ 40446a: 48 89 04 24 mov %rax,(%rsp)
+ 40446e: e8 cd 37 01 00 callq 417c40 <_ZL16peek_state_tokeni>
+ 404473: bf 02 00 00 00 mov $0x2,%edi
+ 404478: 48 89 c5 mov %rax,%rbp
+ 40447b: e8 c0 37 01 00 callq 417c40 <_ZL16peek_state_tokeni>
So it seems to be something else than partitioning changes. Looking at
assembly there are some things that seems like partitioning&inlining
differences. This partiuclar one doesn't seem to be.
>From gcc-bugs-return-603231-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 21:59:59 2018
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Subject: [Bug tree-optimization/85143] Loop limit prevents (auto)vectorization
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--- Comment #7 from Marc Glisse <glisse at gcc dot gnu.org> ---
Note that the patch still doesn't handle
_1 = n_15(D) <= i_46;
_2 = i_46 > 1336;
_3 = _1 | _2;
because of the mix between strict and large inequalities.
(if I write int m = 1337; and replace i < 1337 with i < m, the transformation
does happen, and with a suitable -march it vectorizes)
>From gcc-bugs-return-603232-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue May 01 22:48:50 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/84654] libstdc++ tries to use __float128 when compiling with -mno-float128
Date: Tue, 01 May 2018 22:48:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Tue May 1 22:47:33 2018
New Revision: 259813
URL: https://gcc.gnu.org/viewcvs?rev=259813&root=gcc&view=rev
Log:
PR libstdc++/84654 Disable __float128 specializations for -mno-float128
2018-05-01 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
PR libstdc++/84654
* acinclude.m4: Set ENABLE_FLOAT128 instead of _GLIBCXX_USE_FLOAT128.
* config.h.in: Remove references to _GLIBCXX_USE_FLOAT128.
* configure: Regenerate.
* include/Makefile.am: Replace the value of _GLIBCXX_USE_FLOAT128
based on ENABLE_FLOAT128.
* include/Makefile.in: Regenerate.
* include/bits/c++config: Define _GLIBCXX_USE_FLOAT128.
[!defined(__FLOAT128__) && !defined(__SIZEOF_FLOAT128__)]: Undefine
_GLIBCXX_USE_FLOAT128.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/acinclude.m4
trunk/libstdc++-v3/config.h.in
trunk/libstdc++-v3/configure
trunk/libstdc++-v3/include/Makefile.am
trunk/libstdc++-v3/include/Makefile.in
trunk/libstdc++-v3/include/bits/c++config
>From gcc-bugs-return-603233-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 00:02:13 2018
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From: "andres at anarazel dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85601] New: [8 Regression] anonymous struct & union namespace conflict in extern C block
Date: Wed, 02 May 2018 00:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85601
Bug ID: 85601
Summary: [8 Regression] anonymous struct & union namespace
conflict in extern C block
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Hi,
When compiling with g++ anonymous structs / unions inside C functions conflict
based on their variable name. That wasn't previously the case and doesn't seem
to make much sense.
Ex.:
extern "C"
{
static inline void funca(void)
{
union
{
int a;
} myunion;
(void) myunion;
}
static inline void funcb(void)
{
union
{
int a;
} myunion;
(void) myunion;
}
}
andres@alap4:~/src/postgresql$ /usr/lib/gcc-snapshot/bin/g++ --version
g++ (Debian 20180425-1) 9.0.0 20180425 (experimental) [trunk revision 259645]
..
andres@alap4:~/src/postgresql$ /usr/lib/gcc-snapshot/bin/g++ -c -o /tmp/frak.o
/tmp/frak.cc
/tmp/frak.cc: In function 'void funcb()':
/tmp/frak.cc:18:9: warning: conflicting C language linkage declaration
'funcb()::<unnamed union> myunion'
} myunion;
^~~~~~~
/tmp/frak.cc:8:9: note: previous declaration 'funca()::<unnamed union> myunion'
} myunion;
^~~~~~~
If I rename one of the *variables* in the *independent* functions the error
vanishes.
This currently triggers inside PostgreSQL's master branch (which now uses C++
for an optional module).
Regards,
Andres Freund
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This was just fixed today: See bug 85580.
*** This bug has been marked as a duplicate of bug 85580 ***
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Subject: [Bug c++/85580] [8 Regression] "conflicting C language linkage declaration" warning for variables with identical names in `extern "C"` functions
Date: Wed, 02 May 2018 00:06:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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CC| |andres at anarazel dot de
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 85601 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603236-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 00:10:09 2018
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From: "pthaugen at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85600] [9 Regression] CPU2006 471.omnetpp fails starting with r259771
Date: Wed, 02 May 2018 00:10:00 -0000
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Pat Haugen <pthaugen at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |8.0
Summary|CPU2006 471.omnetpp fails |[9 Regression] CPU2006
|starting with r259771 |471.omnetpp fails starting
| |with r259771
Known to fail| |9.0
--- Comment #3 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
Benchmark fails same way with no optimization.
>From gcc-bugs-return-603237-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 00:21:44 2018
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Subject: [Bug c++/81420] When a reference is bound to a member in the base of a temporary, lifetime of the temporary is not extended
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Jason Merrill <jason at gcc dot gnu.org> changed:
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>From gcc-bugs-return-603238-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 00:28:30 2018
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From: "eggert at gnu dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/85602] New: regression with strncat and -Wall in GCC 8
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85602
Bug ID: 85602
Summary: regression with strncat and -Wall in GCC 8
Product: gcc
Version: 8.0.1
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Created attachment 44051
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44051&action=edit
test program illustrating the regression
I ran into some problems building GNU Coreutils with gcc (GCC) 8.0.1 20180324
(Red Hat 8.0.1-0.20) and isolated it to the attached program w.c. The command
"gcc -Wall w.c" reports:
w.c: In function ‘main’:
w.c:11:35: warning: argument to ‘sizeof’ in ‘strncat’ call is the same
expression as the source; did you mean to use the size of the destination?
[-Wsizeof-pointer-memaccess]
strncat (buf, u.ut_user, sizeof u.ut_user);
This diagnostic is quite wrong, and propagates confusion about strncat. Unlike
strncpy, strncat does not zero-fill the destination, and it is almost always
incorrect to do as GCC suggests which is to specify the size of the destination
as the third argument.
The source code is correct as-is: it is one of the few places where strncat is
the right function to use, as strncat was designed for struct utmp and similar
data structures. GCC 7 does not warn about this usage, and GCC 8 should not
warn either.
>From gcc-bugs-return-603239-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 01:33:14 2018
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From: "w6ws at earthlink dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85603] New: ICE with character array substring assignment
Date: Wed, 02 May 2018 01:33:00 -0000
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Bug ID: 85603
Summary: ICE with character array substring assignment
Product: gcc
Version: 9.0
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The following test case causes an ICE. First noticed with v5.4, but also
happens with v4.8 and a 4/26/2018 snapshot of v9.0.0. Intel and NAG compile
and run this. PGI v17.10 also gets an ICE...:
program strlen_bug
implicit none
character(:), allocatable :: strings(:)
integer :: maxlen
strings = [ character(32) :: &
'short', &
'somewhat longer' ]
maxlen = maxval (len_trim (strings))
print *, 'max length =', maxlen
! causes ICE !
strings = strings(:)(:maxlen)
print *, strings
end program
wws@w6ws-4:/rootsda5/home/wws/fortran/array_cons$
/usr/local/gcc-trunk/bin/gfortran --version
GNU Fortran (GCC) 9.0.0 20180426 (experimental)
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.
wws@w6ws-4:/rootsda5/home/wws/fortran/array_cons$
/usr/local/gcc-trunk/bin/gfortran strlen_bug.f90
strlen_bug.f90:13:0:
strings = strings(:)(:maxlen)
internal compiler error: Segmentation fault
0xce260f crash_signal
../../gcc-trunk/gcc/toplev.c:325
0x7722a7 gfc_alloc_allocatable_for_assignment(gfc_loopinfo*, gfc_expr*,
gfc_expr*)
../../gcc-trunk/gcc/fortran/trans-array.c:9915
0x7a3c24 gfc_trans_assignment_1
../../gcc-trunk/gcc/fortran/trans-expr.c:10329
0x754537 trans_code
../../gcc-trunk/gcc/fortran/trans.c:1828
0x7e7b2f gfc_trans_block_construct(gfc_code*)
../../gcc-trunk/gcc/fortran/trans-stmt.c:2058
0x754327 trans_code
../../gcc-trunk/gcc/fortran/trans.c:1924
0x788f45 gfc_generate_function_code(gfc_namespace*)
../../gcc-trunk/gcc/fortran/trans-decl.c:6507
0x7081d0 translate_all_program_units
../../gcc-trunk/gcc/fortran/parse.c:6121
0x7081d0 gfc_parse_file()
../../gcc-trunk/gcc/fortran/parse.c:6324
0x75107f gfc_be_parse_file
../../gcc-trunk/gcc/fortran/f95-lang.c:204
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.
wws@w6ws-4:/rootsda5/home/wws/fortran/array_cons$
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85599] invalid optimization: function not always evaluated in logical expression
Date: Wed, 02 May 2018 05:39:00 -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 janus from comment #0)
> Consider the following test case:
>
>
> program lazy
>
> logical :: flag
>
> flag = .false.
> flag = check() .and. flag ! 'check' is executed as expected
> flag = flag .and. check() ! bug: 'check' is not executed
>
> contains
>
> logical function check()
> integer, save :: i = 1
> print *, "check", i
> i = i + 1
> check = .true.
> end function
>
> end
>
>
> The problem here is that gfortran executes the function 'check' only once,
> although it should be executed twice AFAICS.
>
> Optimizing out the function call might be valid for a PURE function, but for
> an impure one with side effects, I don't think this is allowed.
>
> Both ifort and flang execute the function twice. For gfortran, the
> optimization level does not seem to influence the result: -O0 and -O3 behave
> in the same way.
>
> I tried with gfortran versions 5, 6, 7 and 8, which all exhibit the same
> buggy behavior.
The behavior may not be buggy, and it's best not to depend
on side-effects. From F2018,
10.1.5.4.2 Evaluation of logical intrinsic operations
Once the interpretation of a logical intrinsic operation is
established, the processor may evaluate any other expression
that is logically equivalent, provided that the integrity of
parentheses in any expression is not violated.
Two expressions of type logical are logically equivalent
if their values are equal for all possible values of their
primaries.
With 'flag = .false.', gfortran can determine that
check()'s return value is irrelevant. So, the
the values of 'flag .and. check()' and 'flag' are
logically equivalent.
Note, 'check() .and. flag' is logically equivalent
to 'flag', but the standard does not require any order
in the evaluation of op1 and op2 in a binary operation.
Also, note that this is my interpretation. I could
be wrong.
>From gcc-bugs-return-603241-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 07:12:54 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/85451] [offloading] Improve lto-wrapper error message when not finding mkoffload
Date: Wed, 02 May 2018 07:12:00 -0000
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--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Wed May 2 07:12:15 2018
New Revision: 259821
URL: https://gcc.gnu.org/viewcvs?rev=259821&root=gcc&view=rev
Log:
[lto] Add "could not find mkoffload" error message to lto-wrapper
2018-05-02 Tom de Vries <tom@codesourcery.com>
PR lto/85451
* lto-wrapper.c (compile_offload_image): Add "could not find mkoffload"
error message.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/lto-wrapper.c
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Subject: [Bug lto/85451] [offloading] Improve lto-wrapper error message when not finding mkoffload
Date: Wed, 02 May 2018 07:16:00 -0000
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
Patches committed, marking resolved-fixed.
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Subject: [Bug tree-optimization/85579] [9 regression] SIGSEV in fortran test case gfortran.dg/pr51434.f90 starting with r259754
Date: Wed, 02 May 2018 07:23:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-02
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Target Milestone|--- |9.0
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will have a look.
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Subject: [Bug target/85430] [7 Regression] ICE: SIGSEGV in memory_operand at recog.c:1358/9 with -O2 -fno-tree-ccp -fno-tree-fre
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[7/8/9 Regression] ICE: |[7 Regression] ICE: SIGSEGV
|SIGSEGV in memory_operand |in memory_operand at
|at recog.c:1358/9 with -O2 |recog.c:1358/9 with -O2
|-fno-tree-ccp -fno-tree-fre |-fno-tree-ccp -fno-tree-fre
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 8.1+.
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Subject: [Bug lto/85583] [9 Regression] lto1: internal compiler error: in lto_balanced_map, at lto/lto-partition.c:833
Date: Wed, 02 May 2018 07:37:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code, lto
CC| |hubicka at gcc dot gnu.org
Target Milestone|--- |9.0
Summary|lto1: internal compiler |[9 Regression] lto1:
|error: in lto_balanced_map, |internal compiler error: in
|at lto/lto-partition.c:833 |lto_balanced_map, at
| |lto/lto-partition.c:833
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
The sanity check was fixed one already. Honza?
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Subject: [Bug middle-end/85586] [8/9 Regression] Optimizer produces different result on -O2 and -O3
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>From gcc-bugs-return-603248-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 07:38:35 2018
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85575] Acceptance of invalid code: ordering of declaration statements with implicit typing
Date: Wed, 02 May 2018 07:38:00 -0000
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--- Comment #3 from Jürgen Reuter <juergen.reuter at desy dot de> ---
This seems to be a GNU extension. In fact, when compiling with -std=f2008
gfortran throws an error. So my guess is this a wanted extension for backwards
compatibility with old programs, well not too old, as they must at least have
modules. If that's the case (wanted extension) then that's probably a
"worksforme" close case.
>From gcc-bugs-return-603249-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 07:39:10 2018
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Subject: [Bug tree-optimization/85588] [6/7/8/9 Regression] -fwrapv miscompilation
Date: Wed, 02 May 2018 07:39:00 -0000
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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> ---
Mine then.
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Subject: [Bug rtl-optimization/85594] ICE during expand when compiling with -fwrapv -fopenmp
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85594
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |NEW
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Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug middle-end/85586] [8/9 Regression] Optimizer produces different result on -O2 and -O3
Date: Wed, 02 May 2018 07:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85586
--- Comment #4 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Author: rsandifo
Date: Wed May 2 07:40:22 2018
New Revision: 259822
URL: https://gcc.gnu.org/viewcvs?rev=259822&root=gcc&view=rev
Log:
Tighten early exit in vect_analyze_data_ref_dependence (PR85586)
The problem in this PR was that we didn't consider aliases between
writes in the same strided group. After tightening the early exit
we get the expected abs(step) >= 2 versioning check.
2018-05-02 Richard Sandiford <richard.sandiford@linaro.org>
gcc/
PR tree-optimization/85586
* tree-vect-data-refs.c (vect_analyze_data_ref_dependence): Only
exit early for statements in the same group if the accesses are
not strided.
gcc/testsuite/
PR tree-optimization/85586
* gcc.dg/vect/pr85586.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/vect/pr85586.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vect-data-refs.c
>From gcc-bugs-return-603252-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 07:42:34 2018
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Subject: [Bug target/85595] __atomic_is_lock_free(sizeof(unsigned long long), &v) returns true on i686
Date: Wed, 02 May 2018 07:42:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |i?86-*-*
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-05-02
Ever confirmed|0 |1
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
A better example like...?
>From gcc-bugs-return-603253-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 07:44:32 2018
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Subject: [Bug middle-end/85586] [8/9 Regression] Optimizer produces different result on -O2 and -O3
Date: Wed, 02 May 2018 07:44:00 -0000
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--- Comment #5 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Author: rsandifo
Date: Wed May 2 07:43:49 2018
New Revision: 259823
URL: https://gcc.gnu.org/viewcvs?rev=259823&root=gcc&view=rev
Log:
Tighten early exit in vect_analyze_data_ref_dependence (PR85586)
The problem in this PR was that we didn't consider aliases between
writes in the same strided group. After tightening the early exit
we get the expected abs(step) >= 2 versioning check.
2018-05-02 Richard Sandiford <richard.sandiford@linaro.org>
gcc/
PR tree-optimization/85586
* tree-vect-data-refs.c (vect_analyze_data_ref_dependence): Only
exit early for statements in the same group if the accesses are
not strided.
gcc/testsuite/
PR tree-optimization/85586
* gcc.dg/vect/pr85586.c: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/gcc.dg/vect/pr85586.c
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/testsuite/ChangeLog
branches/gcc-8-branch/gcc/tree-vect-data-refs.c
>From gcc-bugs-return-603254-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 07:46:29 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85597] [6/7/8/9 Regression] internal compiler error: in compute_live_loop_exits, at tree-ssa-loop-manip.c:229
Date: Wed, 02 May 2018 07:46:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-02
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine then. SSA form is corrupt:
<bb 12> [local count: 858993466]:
vect_cst__66 = { 1.0e+0, 1.0e+0, 1.0e+0, 1.0e+0 };
_67 = {_6, _10, _13, _16};
vect_cst__68 = _67;
<bb 3> [local count: 6950038024]:
...
# ivtmp_73 = PHI <ivtmp_74(5), 0(12)>
_6 = *S_32;
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Subject: [Bug middle-end/85598] Incorrect warning only at -O2 and -O3
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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> ---
Confirmed.
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Subject: =?UTF-8?B?W0J1ZyBjKysvODU1ODddIFs4LzkgUmVncmVzc2lvbl0gYm9ndXMgZXJyb3I6?= =?UTF-8?B?IOKAmEbigJkgd2FzIG5vdCBkZWNsYXJlZCBpbiB0aGlzIHNjb3Bl?Date: Wed, 02 May 2018 07:51:00 -0000
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed May 2 07:50:28 2018
New Revision: 259824
URL: https://gcc.gnu.org/viewcvs?rev=259824&root=gcc&view=rev
Log:
PR c++/85587 - error with scoped enum in template.
* semantics.c (finish_qualified_id_expr): Don't return an
unqualified IDENTIFIER_NODE.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/cpp0x/scoped_enum8.C
Modified:
branches/gcc-8-branch/gcc/cp/ChangeLog
branches/gcc-8-branch/gcc/cp/semantics.c
>From gcc-bugs-return-603257-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 07:51:33 2018
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Subject: [Bug middle-end/85598] [7/8/9 Regression] Incorrect warning only at -O2 and -O3
Date: Wed, 02 May 2018 07:51:00 -0000
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What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Target Milestone|--- |7.4
Summary|Incorrect warning only at |[7/8/9 Regression]
|-O2 and -O3 |Incorrect warning only at
| |-O2 and -O3
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Subject: [Bug target/85582] [9 Regression] wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed May 2 07:52:08 2018
New Revision: 259825
URL: https://gcc.gnu.org/viewcvs?rev=259825&root=gcc&view=rev
Log:
PR target/85582
* config/i386/i386.md (*ashl<dwi>3_doubleword_mask,
*ashl<dwi>3_doubleword_mask_1, *<shift_insn><dwi>3_doubleword_mask,
*<shift_insn><dwi>3_doubleword_mask_1): If and[sq]i3 is needed, don't
clobber operands[2], instead use a new pseudo. Formatting fixes.
* gcc.c-torture/execute/pr85582-1.c: New test.
* gcc.c-torture/execute/pr85582-2.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/execute/pr85582-1.c
trunk/gcc/testsuite/gcc.c-torture/execute/pr85582-2.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.md
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/85600] [9 Regression] CPU2006 471.omnetpp fails starting with r259771
Date: Wed, 02 May 2018 07:52:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Priority|P3 |P1
Target Milestone|--- |9.0
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Subject: [Bug middle-end/85602] [8/9 Regression] regression with strncat and -Wall in GCC 8
Date: Wed, 02 May 2018 07:54:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Priority|P3 |P2
Target Milestone|--- |8.2
Summary|regression with strncat and |[8/9 Regression] regression
|-Wall in GCC 8 |with strncat and -Wall in
| |GCC 8
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Subject: [Bug middle-end/85567] [7/8/9 Regression] internal compiler error: in gimplify_modify_expr, at gimplify.c:5797 when using sincos()
Date: Wed, 02 May 2018 08:00:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed May 2 07:59:34 2018
New Revision: 259826
URL: https://gcc.gnu.org/viewcvs?rev=259826&root=gcc&view=rev
Log:
2018-05-02 Richard Biener <rguenther@suse.de>
PR middle-end/85567
* gimplify.c (gimplify_save_expr): When in SSA form allow
SAVE_EXPRs to compute to SSA vars.
* gcc.dg/torture/pr85567.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr85567.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/gimplify.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug middle-end/85567] [7/8 Regression] internal compiler error: in gimplify_modify_expr, at gimplify.c:5797 when using sincos()
Date: Wed, 02 May 2018 08:01:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |9.0
Summary|[7/8/9 Regression] internal |[7/8 Regression] internal
|compiler error: in |compiler error: in
|gimplify_modify_expr, at |gimplify_modify_expr, at
|gimplify.c:5797 when using |gimplify.c:5797 when using
|sincos() |sincos()
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
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Subject: [Bug fortran/85599] invalid optimization: function not always evaluated in logical expression
Date: Wed, 02 May 2018 08:11:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|wrong-code |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-02
CC| |tkoenig at gcc dot gnu.org
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to kargl from comment #1)
> 10.1.5.4.2 Evaluation of logical intrinsic operations
>
> Once the interpretation of a logical intrinsic operation is
> established, the processor may evaluate any other expression
> that is logically equivalent, provided that the integrity of
> parentheses in any expression is not violated.
>
> Two expressions of type logical are logically equivalent
> if their values are equal for all possible values of their
> primaries.
>
> With 'flag = .false.', gfortran can determine that
> check()'s return value is irrelevant. So, the
> the values of 'flag .and. check()' and 'flag' are
> logically equivalent.
>
> Note, 'check() .and. flag' is logically equivalent
> to 'flag', but the standard does not require any order
> in the evaluation of op1 and op2 in a binary operation.
>
> Also, note that this is my interpretation. I could
> be wrong.
You're right, the code relying on side effects is undefined.
Confirming as enhancement request.
Would be nice to add a warning to catch this, though.
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Subject: [Bug fortran/85599] invalid optimization: function not always evaluated in logical expression
Date: Wed, 02 May 2018 08:12:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
--- Comment #3 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Additionally, I think check() should never be executed, at least not
if optimizing.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85579] [9 regression] SIGSEV in fortran test case gfortran.dg/pr51434.f90 starting with r259754
Date: Wed, 02 May 2018 08:28:00 -0000
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Christophe Lyon <clyon at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |clyon at gcc dot gnu.org
--- Comment #3 from Christophe Lyon <clyon at gcc dot gnu.org> ---
Seen on aarch64 and arm too.
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Subject: [Bug tree-optimization/85579] [9 regression] SIGSEV in fortran test case gfortran.dg/pr51434.f90 starting with r259754
Date: Wed, 02 May 2018 08:32:00 -0000
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
To me the testcase looks invalid:
integer, parameter :: n = 5
character(len=1), parameter :: s(n) = 'a'
type :: a
integer :: m = n
character(len=1):: t(n) = transfer('abcde ', s)
this initializes an array of size 5 with a sequence of too many chars:
bar ()
{
static struct a c = {.m=5, .t={"a", "b", "c", "d", "e", " ", " ", " ", " ", "
", " ", " ", " ", " ", " ", " ", " ", " "}};
OTOH maybe nothing cares. But we definitely do output the constants and for
aarch64 I see:
.set .LANCHOR0,. + 0
.type options.3.2654, %object
.size options.3.2654, 28
options.3.2654:
.word 102
.word 8191
.word 1
.word 1
.word 1
.word 0
.word 31
.zero 4
.type c.2640, %object
.size c.2640, 12
c.2640:
.word 5
.ascii "a"
.ascii "b"
.ascii "c"
.ascii "d"
.ascii "e"
.ascii " "
.ascii " "
.ascii " "
.ascii " "
.ascii " "
.ascii " "
.ascii " "
.ascii " "
.ascii " "
.ascii " "
.ascii " "
.ascii " "
.ascii " "
.zero 4
.type A.1.2647, %object
.size A.1.2647, 40
A.1.2647:
.xword .LC0
.xword .LC1
.xword .LC2
...
notice the bogus .size of c.2640. But then we get to both c and A via
adrp x0, .LANCHOR0
add x0, x0, :lo12:.LANCHOR0
add x3, x0, 32
add x0, x0, 48
which looks wrong.
Not sure why it worked before (or why it doesn't work on powerpc) but
clearly the frontend emits bogus IL here and/or the output machinery
should avoid emitting excess elements(?).
>From gcc-bugs-return-603267-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 08:40:03 2018
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Subject: [Bug middle-end/85586] [8/9 Regression] Optimizer produces different result on -O2 and -O3
Date: Wed, 02 May 2018 08:40:00 -0000
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Patch applied. Thanks for reporting the bug!
>From gcc-bugs-return-603268-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 08:50:04 2018
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Subject: [Bug lto/85583] [9 Regression] lto1: internal compiler error: in lto_balanced_map, at lto/lto-partition.c:833
Date: Wed, 02 May 2018 08:50:00 -0000
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Jan Hubicka <hubicka at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Ever confirmed|0 |1
--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
I will take a look. Indeed it was buggy for empty files (where best cost is -1
rather than 0), but this is probably independent issue.
>From gcc-bugs-return-603269-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 08:53:32 2018
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From: "janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85599] invalid optimization: function not always evaluated in logical expression
Date: Wed, 02 May 2018 08:53:00 -0000
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--- Comment #4 from janus at gcc dot gnu.org ---
(In reply to kargl from comment #1)
> The behavior may not be buggy, and it's best not to depend
> on side-effects. From F2018,
>
> 10.1.5.4.2 Evaluation of logical intrinsic operations
>
> Once the interpretation of a logical intrinsic operation is
> established, the processor may evaluate any other expression
> that is logically equivalent, provided that the integrity of
> parentheses in any expression is not violated.
>
> Two expressions of type logical are logically equivalent
> if their values are equal for all possible values of their
> primaries.
>
Thanks for the standard quote, Steve. It certainly goes in the right direction,
but I feel like it's not quite to the point.
Some other (possibly) relevant passages I found in the 2008 standard:
*****
7.1.7 Evaluation of operands
1 It is not necessary for a processor to evaluate all of the operands of an
expression, or to evaluate entirely each operand, if the value of the
expression can be determined otherwise.
*****
That also sounds like optimizing away the function call might be valid, but
then there is also this one:
*****
7.1.4 Evaluation of operations
2 The evaluation of a function reference shall neither affect nor be affected
by the evaluation of any other entity within the statement.
*****
The way I read it, gfortran's implementation currently violates this clause for
the expression "flag = flag .and. check()", because the evaluation of the
function reference "check()" is affected by the value of the variable "flag".
So I'd argue that the bug here is not missed-optimization in the first case,
but over-optimization in the second, after all.
What worries me most is that other compilers choose different implementations.
Can this kind of code really be processor-dependent?
>From gcc-bugs-return-603270-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 09:03:05 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85604] New: Default template arguments in friend class template declarations should not be allowed
Date: Wed, 02 May 2018 09:03:00 -0000
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Bug ID: 85604
Summary: Default template arguments in friend class template
declarations should not be allowed
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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template <int A, bool L> struct Template_Class;
struct Other_Struct
{
template <int A, bool L = (A < 42)> friend struct Template_Class;
};
template <int A, bool>
struct Template_Class
{
};
template <>
struct Template_Class<0>
{
};
Per [temp.param]/12:
"A default template-argument shall not be specified in a friend class template
declaration."
All versions of G++ since at least 4.1.2 accept the code above.
Clang++ correctly rejects this code:
<source>:5:26: error: default template argument not permitted on a friend
template
template <int A, bool L = (A < 42)> friend struct Template_Class;
^ ~~~~~~~~
<source>:14:8: error: too few template arguments for class template
'Template_Class'
struct Template_Class<0>
^
<source>:9:8: note: template is declared here
struct Template_Class
^
https://godbolt.org/g/Tvf7Fr
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85605] New: Potentially missing optimization under x64 and ARM: seemingly unnecessary branch in codegen
Date: Wed, 02 May 2018 09:14:00 -0000
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Bug ID: 85605
Summary: Potentially missing optimization under x64 and ARM:
seemingly unnecessary branch in codegen
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: sergey.ignatchenko at ithare dot com
Target Milestone: ---
Code:
==========
#include <stdint.h>
#include <type_traits>
template<class T,class T2>
inline bool cmp(T a, T2 b) {
return a<0 ? true : T2(a) < b;
}
template<class T,class T2>
inline bool cmp2(T a, T2 b) {
return (a<0) | (T2(a) < b);
}
bool f(int a, int b) {
return cmp(int64_t(a), unsigned(b));
}
bool f2(int a, int b) {
return cmp2(int64_t(a), unsigned(b));
}
====
Functions cmp and cmp2 seem to be equivalent (at least under "as if" rule, as
side effects of reading and casting are non-observable). However, under
GCC/x64, cmp() generates code with branch, while seemingly-equivalent cmp2() -
manages to do without branching:
===============
f(int, int):
testl %edi, %edi
movl $1, %eax
js .L1
cmpl %edi, %esi
seta %al
.L1:
rep ret
f2(int, int):
movl %edi, %edx
shrl $31, %edx
cmpl %edi, %esi
seta %al
orl %edx, %eax
ret
===============
And f2() is expected to be significantly faster than f1() in most usage
scenarios (*NB: if you feel it is necessary to create a case to illustrate
detriment of branching - please LMK, but hopefully it is quite obvious*).
Per Godbolt, similar behavior is observed under both GCC/x64, and GCC/ARM;
however, Clang manages to do without branching both for f1() and f2().
*Godbolt link*: https://godbolt.org/g/ktovvP
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
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--- Comment #62 from Andrew Haley <aph at gcc dot gnu.org> ---
Just a bit of clarification:
(In reply to James Kuyper Jr. from comment #59)
>
> > 1) all type-based alias analysis is effectively impossible
>
> Alias analysis is only affected by the special guarantee if
> a) the types involved are both struct types
> b) both struct types are members of the same union
> c) the struct types share a common initial sequence
OK to all of those.
> d) the code in question inspects the value of one of the members of the
> common initial sequence.
While this is a reasonable inference from what the text of the
standard says, type-based alias analysis, by definition, does not pay
any attention to what any piece of code does. The analysis is purely
type-based: that is to say, it only uses the types, and the only
question it answers is "Do these types alias?"
> e) a completed declaration of the union type that they are members
> of is visible at the point in the code where the inspection occurrs.
As explained elsewhere, TBAA doesn't use visibility as a criterion.
> It seems to me that the overwhelming majority of cases will fail to
> meet at least one of those requirements, so type-based alias
> analysis is still possible, it's just made more complicated by the
> need to check for those things.
That's not quite right, as explained above. If you use information
other than types in alias analysis, it's no longer TBAA. It is a
fundamental principle of TBAA that the result of an aliasing query
never changes for any pair of types.
We are extremely unlikely to redesign a big part of the optimizer for
this dusty corner case.
>From gcc-bugs-return-603273-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 09:33:00 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85605] Potentially missing optimization under x64 and ARM: seemingly unnecessary branch in codegen
Date: Wed, 02 May 2018 09:33:00 -0000
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--- Comment #1 from sergey.ignatchenko at ithare dot com ---
Command line switches (see also Godbolt link above): -O3 -fomit-frame-pointer
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Subject: [Bug libstdc++/84654] libstdc++ tries to use __float128 when compiling with -mno-float128
Date: Wed, 02 May 2018 09:48:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for GCC 9.
This might be suitable to backport to release branches after some soak time on
the trunk.
>From gcc-bugs-return-603275-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 09:49:31 2018
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From: "janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85599] invalid optimization: function not always evaluated in logical expression
Date: Wed, 02 May 2018 09:49:00 -0000
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--- Comment #5 from janus at gcc dot gnu.org ---
Here is a variant of the original test case, now with a PURE procedure:
program lazy
logical :: flag
flag = .false.
flag = check() .and. flag
flag = flag .and. check()
contains
pure logical function check()
check = .true.
end function
end
In this case I would think it's perfectly valid to optimize away both calls to
'check', in particular because there is actually no way to check for the user
whether the function 'check' is being called (other than looking at the
assembly code etc).
However, I could not find any distinctions between pure and impure functions in
the standard, when it comes to the question of function evaluation and
optimizations. Any pointers appreciated.
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Wed, 02 May 2018 09:51:00 -0000
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--- Comment #63 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 2 May 2018, aph at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65892
>
> --- Comment #62 from Andrew Haley <aph at gcc dot gnu.org> ---
> Just a bit of clarification:
>
> (In reply to James Kuyper Jr. from comment #59)
> >
> > > 1) all type-based alias analysis is effectively impossible
> >
> > Alias analysis is only affected by the special guarantee if
> > a) the types involved are both struct types
>
> > b) both struct types are members of the same union
> > c) the struct types share a common initial sequence
>
> OK to all of those.
>
> > d) the code in question inspects the value of one of the members of the
> > common initial sequence.
>
> While this is a reasonable inference from what the text of the
> standard says, type-based alias analysis, by definition, does not pay
> any attention to what any piece of code does. The analysis is purely
> type-based: that is to say, it only uses the types, and the only
> question it answers is "Do these types alias?"
>
> > e) a completed declaration of the union type that they are members
> > of is visible at the point in the code where the inspection occurrs.
>
> As explained elsewhere, TBAA doesn't use visibility as a criterion.
>
> > It seems to me that the overwhelming majority of cases will fail to
> > meet at least one of those requirements, so type-based alias
> > analysis is still possible, it's just made more complicated by the
> > need to check for those things.
>
> That's not quite right, as explained above. If you use information
> other than types in alias analysis, it's no longer TBAA. It is a
> fundamental principle of TBAA that the result of an aliasing query
> never changes for any pair of types.
>
> We are extremely unlikely to redesign a big part of the optimizer for
> this dusty corner case.
Just sth I noticed. The standard says
"it is permitted to inspect the common initial part of any of them"
and GCC already allows that. But the testcase in this PR access
this common initial part via the actual structure types containing
this common initial sequences. GCC has maintained the interpretation
of the standard that for struct S *p; an access like p->x is an
access of *p with respect to TBAA analysis. But the standard doesn't
say you may access both structures containing the initial sequence
but it only says you may inspect the common initial part. So if you
do
int f (struct t1 *p1, struct t2 *p2)
{
// union U visible here, p1->m and p2->m may alias
int *x = &p1->m;
int *y = &p2->m;
if (*x < 0)
*y = -*y;
return *x;
}
then it will work just fine.
I guess we all agree that the standards wording isn't 100% clear
and that it should be improved.
It may of course be that GCCs interpretation that p->x is an
access of *p isn't correct. But then I don't need the union
clause because if p1->m is an access of 'int' only with
respect to TBAA then of course 'int' aliases 'int'.
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Subject: [Bug testsuite/85368] [8/9 regression] phi-opt-11 test fails on IBM Z
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug rtl-optimization/83361] [7 Regression ?] ICE: verify_flow_info failed (error: non-cold basic block 3 reachable only by paths crossing the cold partition) on 32-bit BE powerpc targets
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/85512] [8/9 Regression] gcc generating non-existing sshr with immh == 0
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug tree-optimization/78496] [7 Regression] Missed opportunities for jump threading
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--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug regression/81331] [6/7 Regression] missed Eh delivery in partitioned function
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug go/84948] [8/9 regression] ICE in set_from, at go/gofrontend/types.cc:2660
Date: Wed, 02 May 2018 10:04:00 -0000
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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> ---
GCC 8.1 has been released.
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Subject: [Bug target/83267] [8/9 regression] [armeb] gfortran.fortran-torture/execute/scalarize2.f90 fails since r255307
Date: Wed, 02 May 2018 10:04:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug rtl-optimization/80791] [8/9 regression] test case gcc.dg/sms-1.c fail2 starting with r247885
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #19 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/84251] [8/9 Regression] Performance regression in gcc 8/9 when comparing floating point numbers
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/84848] [8/9 Regression] FAIL: gfortran.dg/coarray/event_3.f08/9 -fcoarray=single -O2 -latomic execution test
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug c++/85046] [8/9 Regression] cp/name-lookup.c:6175:53: runtime error: member access within null pointer of type 'struct cp_binding_level'
Date: Wed, 02 May 2018 10:04:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/79166] [ARM] Implement neon_valid_immediate tricks for BYTES_BIG_ENDIAN
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603287-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:04:23 2018
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Subject: [Bug tree-optimization/80198] [6/7/8/9 Regression] does not vectorize generic inplace integer operation
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/85507] [6/7/8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug middle-end/84048] [8/9 Regression] FAIL: gcc.dg/torture/tls/run-ld.c -O0 -pie -fPIE execution test
Date: Wed, 02 May 2018 10:04:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug rtl-optimization/71596] gcc bootstrap fails due to segv in genrecog
Date: Wed, 02 May 2018 10:04:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug tree-optimization/85459] [8/9 Regression] Larger code generated from GMP template meta-programming
Date: Wed, 02 May 2018 10:04:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/82005] Early lto debug not implemented on Darwin
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #39 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/78595] Unnecessary copies in _Rb_tree
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug ada/82844] [8/9 Regression] Many ada tests time out on x32
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/83838] Many gcc.target/i386/indirect-thunk*.c tests FAIL
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/71991] Inconsistency for __attribute__ ((__always_inline__)) among LTO and non-LTO compilation
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/83906] Random FAIL: libstdc++-prettyprinters/80276.cc whatis p4
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #20 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603300-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:05:16 2018
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Subject: [Bug ipa/85103] [8/9 Regression] Performance regressions on SPEC with r257582
Date: Wed, 02 May 2018 10:05:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libfortran/78549] Very slow formatted internal file output
Date: Wed, 02 May 2018 10:05:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #33 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603309-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:05:47 2018
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Subject: [Bug middle-end/82407] [meta-bug] qsort_chk fallout tracking
Date: Wed, 02 May 2018 10:05:00 -0000
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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> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/84135] [8/9 Regression] ICE in gfc_trans_array_cobounds, at fortran/trans-array.c:6033
Date: Wed, 02 May 2018 10:05:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug c++/84733] [8/9 Regression] internal compiler error: Segmentation fault (check_local_shadow())
Date: Wed, 02 May 2018 10:05:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/83851] [8/9 regression] gcc.dg/vect/pr53185-2.c fails on armeb after r256634
Date: Wed, 02 May 2018 10:05:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug tree-optimization/81018] [8/9 regression] gfortran.dg/graphite/pr14741.f90 FAILs
Date: Wed, 02 May 2018 10:05:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug tree-optimization/83403] Missed register promotion opportunities in loop
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug tree-optimization/78972] [6/7/8/9 Regression] poor x86 simd instruction scheduling
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug inline-asm/84941] [6/7 Regression] internal compiler error: in reg_overlap_mentioned_p, at rtlanal.c:1870 (reg_overlap_mentioned_p()/match_asm_constraints_1())
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug tree-optimization/58454] Potentially wrong(or at least weird/inconsistent) code generation with -O2 -fno-strict-overflow
Date: Wed, 02 May 2018 10:06:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/84413] -mtune=skylake-avx512,cannonlake,icelake disable many optimizations
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/84490] [8/9 regression] 436.cactusADM regressed by 6-8% percent with -Ofast on Zen and Haswell, compared to gcc 7.2
Date: Wed, 02 May 2018 10:06:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug tree-optimization/80511] [8/9 Regression] gcc.dg/Wstrict-overflow-18.c gcc.dg/Wstrict-overflow-7.c gcc.dg/pragma-diag-3.c
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/85314] gcc/fortran/resolve.c:9222: unreachable code ?
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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> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/85506] ICE in gfc_assign_data_value, at fortran/data.c:448
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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> ---
GCC 8.1 has been released.
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Subject: [Bug testsuite/80759] gcc.target/x86_64/abi/ms-sysv FAILs
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #65 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603326-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:07:17 2018
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Subject: [Bug bootstrap/82856] --enable-maintainter-mode broken by incompatiblity of gcc's required automake and modern Perl
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603318-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:06:40 2018
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Subject: [Bug tree-optimization/82446] [8/9 Regression] Missed equalities in dr_group_sort_cmp
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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> ---
GCC 8.1 has been released.
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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, 02 May 2018 10:06:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #35 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug ada/80590] [8/9 regression] non-bootstrap build failure of Ada runtime
Date: Wed, 02 May 2018 10:06:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/83088] [8/9 Regression] ICE with -init-derived
Date: Wed, 02 May 2018 10:06:00 -0000
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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> ---
GCC 8.1 has been released.
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Subject: [Bug rtl-optimization/83530] [7 Regression] ICE in reset_sched_cycles_in_current_ebb, at sel-sched.c:7150
Date: Wed, 02 May 2018 10:06:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug middle-end/77568] [7/8/9 regression] CSE/PRE/Hoisting blocks common instruction contractions
Date: Wed, 02 May 2018 10:07:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug tree-optimization/82255] Vectorizer cost model overcounts cost of some vectorized loads
Date: Wed, 02 May 2018 10:07:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug c++/84598] [8/9 Regression] internal compiler error: Segmentation fault (cp_default_conversion())
Date: Wed, 02 May 2018 10:07:00 -0000
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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> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603313-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:06:09 2018
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Subject: [Bug target/82258] [8/9 regression] allocate_zerosize_3.f fails since r251949
Date: Wed, 02 May 2018 10:07:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603329-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:07:24 2018
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Subject: [Bug libstdc++/79422] Use ACX_BUGURL for error in snprintf_lite.cc
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/84711] AArch32 big-endian fails when taking subreg of a vector mode to a scalar mode.
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug rtl-optimization/82982] [8/9 Regression] ICE: qsort checking failed (error: qsort comparator non-negative on sorted output: 5) in ready_sort_real in haifa scheduler
Date: Wed, 02 May 2018 10:07:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/84472] Missing finalization and memory leak
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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> ---
GCC 8.1 has been released.
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Subject: [Bug middle-end/78809] Inline strcmp with small constant strings
Date: Wed, 02 May 2018 10:07:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #34 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/80938] [7 Regression] ICE in maybe_record_trace_start, at dwarf2cfi.c:2330
Date: Wed, 02 May 2018 10:07:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/77866] Add SystemTap probe points to libstdc++
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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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: Wed, 02 May 2018 10:07:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/70472] is_copy_constructible<vector<unique_ptr<int>>>::value is true
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/78176] [MIPS] miscompiles ldxc1 with large pointers on 32-bits
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #22 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug sanitizer/84508] Load of misaligned address using _mm_load_sd
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--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/78975] uniform_real_distribution should not check RealType with is_floating_point
Date: Wed, 02 May 2018 10:08:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/85521] [8/9 Regression] ICE in gfc_resolve_character_array_constructor, at fortran/array.c:2049
Date: Wed, 02 May 2018 10:08:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug c++/85070] [8/9 Regression] ICE on C++ code: in lazily_declare_fn, at cp/method.c:2409
Date: Wed, 02 May 2018 10:08:00 -0000
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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> ---
GCC 8.1 has been released.
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Subject: [Bug c++/84518] [8/9 Regression] ICE with lambda capturing broken variable
Date: Wed, 02 May 2018 10:08:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603351-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:09:14 2018
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Subject: [Bug target/82138] [8/9 Regression] Assembler messages: Error: can't resolve `.got2' {.got2 section} - `.LCF0' {.text.unlikely section}
Date: Wed, 02 May 2018 10:08:00 -0000
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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> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/84487] [8/9 Regression] Large rodate section increase in 465.tonto with r254427
Date: Wed, 02 May 2018 10:08:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/84923] [8/9 regression] gcc.dg/attr-weakref-1.c failed on aarch64
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/84219] Failure to generate error for IO of transfer intrinsic, when MOLD has derived type components.
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/78009] [OOP] polymorphic component of derived type array slice handling error
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/85138] [8/9 regression] ICE with generic function
Date: Wed, 02 May 2018 10:09:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/84568] libstdc++-v3 configure checks for atomic operations fail on riscv
Date: Wed, 02 May 2018 10:09:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/84521] aarch64: Frame-pointer corruption with __builtin_setjmp/__builtin_longjmp and -fomit-frame-pointer
Date: Wed, 02 May 2018 10:09:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #26 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug preprocessor/78497] compiling with -save-temps adds -Wimplicit-fallthrough warnings
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug middle-end/84016] [8/9 Regression] Spec2000 regression around Jan 14 and Jan 19 2018
Date: Wed, 02 May 2018 10:09:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug middle-end/19706] Recognize common Fortran usages of copysign.
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/84481] [8/9 Regression] 429.mcf with -O2 regresses by ~6% and ~4%, depending on tuning, on Zen compared to GCC 7.2
Date: Wed, 02 May 2018 10:10:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug c++/84588] [8/9 Regression] internal compiler error: Segmentation fault (contains_struct_check())
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug middle-end/82083] sanitizer detects signed integer overflow in tree-data-ref.c with -O3
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/80700] [7/8/9 Regression] ICE: Bus error (on SPE target)
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug rtl-optimization/84659] [6/7 Regression] ICE: Segmentation fault (stack overflow in bb_note) w/ selective scheduling
Date: Wed, 02 May 2018 10:10:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/85145] [8/9 Regression] include_next broken icw/ --with-gxx-include-dir
Date: Wed, 02 May 2018 10:10:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/82995] Segmentation fault passing optional argument to intrinsic sum function
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/24012] [6/7/8/9 regression] #define _POSIX_C_SOURCE breaks #include <iostream>
Date: Wed, 02 May 2018 10:10:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #25 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug c++/85481] [8/9 Regression] ICE in maybe_explain_implicit_delete
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug debug/68860] [6/7/8/9 regression] FAIL: gcc.dg/guality/pr36728-1.c -flto -O3 -g line 16/7 arg1 == 1
Date: Wed, 02 May 2018 10:10:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #23 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/51965] Redundant move constructions in heap algorithms
Date: Wed, 02 May 2018 10:11:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug driver/83206] -mfpu=auto does not work on ARM (armv7l-unknown-linux-gnueabihf)
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #24 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug tree-optimization/80155] [7/8/9 regression] Performance regression with code hoisting enabled
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #34 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug debug/84342] Location views breaks cross builds of arm including gnueabihf
Date: Wed, 02 May 2018 10:11:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug rtl-optimization/81025] [8/9 Regression] gcc ICE while building glibc for MIPS soft-float multi-lib variant
Date: Wed, 02 May 2018 10:11:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/85088] improve diagnostic for bad INTENT declaration ('Invalid character in name at')
Date: Wed, 02 May 2018 10:11:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/80477] [OOP] Polymorphic function result generates memory leak
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #21 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/78798] [cleanup] some int-valued functions should be bool
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603356-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:10:12 2018
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Subject: [Bug target/83052] ICE in extract_insn, at recog.c:2305 with -mcmodel=large
Date: Wed, 02 May 2018 10:11:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603341-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:08:39 2018
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Subject: [Bug rtl-optimization/83852] [6/7 Regression] ICE in sel_redirect_edge_and_branch, at sel-sched-ir.c:5644 on 32-bit BE powerpc targets
Date: Wed, 02 May 2018 10:11:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug middle-end/21161] [6/7/8/9 Regression] "clobbered by longjmp" warning ignores the data flow
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603381-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:12:18 2018
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Subject: [Bug target/82699] ENDBR isn't generated at function entrance
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603374-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:11:46 2018
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Subject: [Bug fortran/82972] [8/9 Regression] ICE with -finit-derived in gfc_conv_structure, at fortran/trans-expr.c:7733 (and others)
Date: Wed, 02 May 2018 10:11:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug c++/84964] [8/9 Regression] ICE in expand_call, at calls.c:4540
Date: Wed, 02 May 2018 10:11:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/83760] [7 Regression] [SH] ICE in maybe_record_trace_start building glibc tst-copy_file_range.c
Date: Wed, 02 May 2018 10:11:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug testsuite/82006] [8/9 Regression] ERROR: torture-init: torture_without_loops is not empty as expected
Date: Wed, 02 May 2018 10:12:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/66366] [OOP] ICE on invalid with non-allocatable CLASS variable
Date: Wed, 02 May 2018 10:12:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/69388] Allow functexcept.cc definitions to be replaced
Date: Wed, 02 May 2018 10:12:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug c++/64095] [C++14] Ellipsis at end of generic lambda parameter-declaration-clause should be parsed as a parameter pack
Date: Wed, 02 May 2018 10:12:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: =?UTF-8?B?W0J1ZyBjKysvODU1ODddIFs4LzkgUmVncmVzc2lvbl0gYm9ndXMgZXJyb3I6?= =?UTF-8?B?IOKAmEbigJkgd2FzIG5vdCBkZWNsYXJlZCBpbiB0aGlzIHNjb3Bl?Date: Wed, 02 May 2018 10:12:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug testsuite/81179] gcc.dg/vect/pr65947-9.c and gcc.dg/vect/pr65947-14.c fail starting with r249553
Date: Wed, 02 May 2018 10:12:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/83328] string.insert does not return a iterator when using initializer lists
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug translation/79423] Translation of warnings breaks IDE parsing of output
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/80676] [DR 2995] basic_stringbuf does not use initial capacity of SSO string
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/80165] Constexpr tuple of variant doesn't work
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/84922] fortran reports inconsistency in rank of arguments in interface and contained procedures
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/77961] [Coarray] [OOP] Allocatable components in CLASS-typed coarrays unsupported.
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug c++/84974] [8/9 Regression] ICE: Segmentation fault (ovl_first()/location_of())
Date: Wed, 02 May 2018 10:12:00 -0000
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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> ---
GCC 8.1 has been released.
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Subject: [Bug rtl-optimization/82024] wrong code with -Og -fgcse-sm -frerun-cse-after-loop --param=max-combine-insns=3
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/83705] [8/9 Regression] ICE/wrong code with large values of REPEAT after revision r256284
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/79422] Use ACX_BUGURL for error in snprintf_lite.cc
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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Subject: [Bug fortran/83149] [6- and 7-branches] Missing test for sym->ns->proc_name: crash_signal in toplev.c:325
Date: Wed, 02 May 2018 10:13:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/81733] stage1 libgcc_s.dylib fails to link on Darwin 11/x86_64
Date: Wed, 02 May 2018 10:13:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libfortran/82962] valgrind reports "Conditional jump or move depends on uninitialised value" in EXECUTE_COMMAND_LINE
Date: Wed, 02 May 2018 10:13:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug fortran/80291] [OOP] ICE in gfc_conv_expr_descriptor, at fortran/trans-array.c:6662
Date: Wed, 02 May 2018 10:13:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603358-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:10:27 2018
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Subject: [Bug tree-optimization/79224] [7 Regression] Large C-Ray slowdown
Date: Wed, 02 May 2018 10:13:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #22 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug rtl-optimization/84345] [8/9 Regression] ICE: qsort checking failed (error: qsort comparator non-negative on sorted output: 1)
Date: Wed, 02 May 2018 10:13:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug libstdc++/77866] Add SystemTap probe points to libstdc++
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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Subject: [Bug tree-optimization/83043] [8/9 Regression] FAIL: libgomp.graphite/force-parallel-1.c scan-tree-dump-times graphite "2 loops carried no dependency" 1 (found 0 times)
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
>From gcc-bugs-return-603397-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:13:06 2018
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Subject: [Bug fortran/83999] [8/9 Regression] ICE in gfc_trans_assignment_1, at fortran/trans-expr.c:10233
Date: Wed, 02 May 2018 10:13:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 8.1 has been released.
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Subject: [Bug target/85606] New: Assembly file generated for ARM Cortex-M0 should not specify `.arch armv6-m` at all or use `.arch armv6s-m`
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85606
Bug ID: 85606
Summary: Assembly file generated for ARM Cortex-M0 should not
specify `.arch armv6-m` at all or use `.arch armv6s-m`
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: freddie_chopin at op dot pl
Target Milestone: ---
Target: arm-none-eabi
This issue is inspired by following bug report for GAS -
https://sourceware.org/bugzilla/show_bug.cgi?id=23126
Following test case works perfectly fine for GCC 5, 6 and 7, however it fails
with GCC 8.0.1 20180427:
-- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 --
$ cat svc.cpp
__attribute__ ((naked))
int supervisorCall(int (& function)(int, int, int, int), const int argument1,
const int argument2, const int argument3,
const int argument4)
{
asm volatile
(
" mov r12, r0 \n"
" ldr r0, [sp] \n"
" svc 0 \n"
" \n"
" bx lr \n"
);
__builtin_unreachable();
// suppress warnings
(void)function;
(void)argument1;
(void)argument2;
(void)argument3;
(void)argument4;
}
$ arm-none-eabi-g++ -c svc.cpp -mcpu=cortex-m0 -save-temps
svc.s: Assembler messages:
svc.s:31: Error: SVC is not permitted on this architecture
$ diff -u svc-7.s svc.s
--- svc-7.s 2018-05-01 20:14:09.031910734 +0200
+++ svc.s 2018-05-01 20:16:36.751143427 +0200
@@ -12,6 +12,7 @@
.text
.align 1
.global _Z14supervisorCallRFiiiiiEiiii
+ .arch armv6-m
.syntax unified
.code 16
.thumb_func
@@ -37,4 +38,4 @@
.cantunwind
.fnend
.size _Z14supervisorCallRFiiiiiEiiii,
.-_Z14supervisorCallRFiiiiiEiiii
- .ident "GCC: (bleeding-edge-toolchain) 7.3.0"
+ .ident "GCC: (bleeding-edge-toolchain) 8.0.1 20180427 (prerelease)"
$ cat svc.s
.cpu cortex-m0
.eabi_attribute 20, 1
.eabi_attribute 21, 1
.eabi_attribute 23, 3
.eabi_attribute 24, 1
.eabi_attribute 25, 1
.eabi_attribute 26, 1
.eabi_attribute 30, 6
.eabi_attribute 34, 0
.eabi_attribute 18, 4
.file "svc.cpp"
.text
.align 1
.global _Z14supervisorCallRFiiiiiEiiii
.arch armv6-m
.syntax unified
.code 16
.thumb_func
.fpu softvfp
.type _Z14supervisorCallRFiiiiiEiiii, %function
_Z14supervisorCallRFiiiiiEiiii:
.fnstart
.LFB0:
@ Naked Function: prologue and epilogue provided by programmer.
@ args = 4, pretend = 0, frame = 0
@ frame_needed = 1, uses_anonymous_args = 0
.syntax divided
@ 12 "svc.cpp" 1
mov r12, r0
ldr r0, [sp]
svc 0
bx lr
@ 0 "" 2
.thumb
.syntax unified
.cantunwind
.fnend
.size _Z14supervisorCallRFiiiiiEiiii,
.-_Z14supervisorCallRFiiiiiEiiii
.ident "GCC: (bleeding-edge-toolchain) 8.0.1 20180427 (prerelease)"
-- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 -- >8 --
(svc-7.s is a temp file generated with GCC 7.3.0)
Nick Clifton in his comment
(https://sourceware.org/bugzilla/show_bug.cgi?id=23126#c4) to the mentioned GAS
bug report suggested that GCC 8 should either specify just `.cpu` (behaviour as
in previous versions) or specify `.arch armv6s-m` instead of `.arch armv6-m`.
Personally I think the first option should be more reliable in that case,
however this is just a guess.
>From gcc-bugs-return-603405-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:25:23 2018
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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85607] New: ice in add_type, at ipa-icf.c:1583
Date: Wed, 02 May 2018 10:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85607
Bug ID: 85607
Summary: ice in add_type, at ipa-icf.c:1583
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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>From the gcc test suite, the file g++.dg/warn/incomplete1.C, when compiled
with flag -O2 on recent gcc trunk, does this:
during IPA pass: icf
./g++.dg/warn/incomplete1.C:22:1: internal compiler error: in add_type, at
ipa-i
cf.c:1583
}
^
0x7d3202 ipa_icf::sem_item::add_type(tree_node const*, inchash::hash&)
../../trunk/gcc/ipa-icf.c:1583
0x1a4853b ipa_icf::sem_function::hash_stmt(gimple*, inchash::hash&)
../../trunk/gcc/ipa-icf.c:1658
0x1a4853b ipa_icf::sem_function::init()
../../trunk/gcc/ipa-icf.c:1432
0x1a5045d ipa_icf::sem_function::parse(cgraph_node*, bitmap_obstack*)
../../trunk/gcc/ipa-icf.c:1717
I'll have my usual go at finding a range of revisions and a small test case.
>From gcc-bugs-return-603406-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:29:18 2018
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Subject: [Bug c++/85607] ice in add_type, at ipa-icf.c:1583
Date: Wed, 02 May 2018 10:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85607
--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
Bug seems to occur between revisions 259747 and 259789.
Code is only a few lines already, so no reduction required.
>From gcc-bugs-return-603407-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:51:37 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++/71660] [6/7/8/9 regression] alignment of std::atomic<8 byte primitive type> (long long, double) is wrong on x86
Date: Wed, 02 May 2018 10:51:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
Summary|[6/7/8/9 regression] |[6/7/8/9 regression]
|alignment of |alignment of std::atomic<8
|std::atomic<8/9 byte |byte primitive type> (long
|primitive type> (long long, |long, double) is wrong on
|double) is wrong on x86 |x86
--- Comment #20 from Jonathan Wakely <redi at gcc dot gnu.org> ---
As discussed above, I'm closing this as not-a-bug. The change to std::atomic
alignment was intentional and is necessary. It would be nice to be consistent
with _Atomic but we seem to be in agreement that the C front end should change,
not std::atomic.
>From gcc-bugs-return-603408-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:54:11 2018
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Subject: [Bug libstdc++/69365] LWG DR2367 (constrained pair default constructor)
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |WONTFIX
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The GCC 5 branch has been closed for some time so we missed the chance to
change it.
>From gcc-bugs-return-603409-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 10:55:45 2018
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Subject: [Bug target/85519] [nvptx, openacc, openmp, testsuite] Recursive tests may fail due to thread stack limit
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--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Wed May 2 10:55:07 2018
New Revision: 259834
URL: https://gcc.gnu.org/viewcvs?rev=259834&root=gcc&view=rev
Log:
backport "[nvptx, libgomp, testsuite] Reduce recursion depth in
declare_target-{1,2}.f90"
2018-05-02 Tom de Vries <tom@codesourcery.com>
backport from trunk:
2018-04-26 Tom de Vries <tom@codesourcery.com>
PR target/85519
* testsuite/libgomp.fortran/examples-4/declare_target-1.f90: Reduce
recursion depth from 25 to 23.
* testsuite/libgomp.fortran/examples-4/declare_target-2.f90: Same.
Modified:
branches/gcc-8-branch/libgomp/ChangeLog
branches/gcc-8-branch/libgomp/testsuite/libgomp.fortran/examples-4/declare_target-1.f90
branches/gcc-8-branch/libgomp/testsuite/libgomp.fortran/examples-4/declare_target-2.f90
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Subject: [Bug target/85519] [nvptx, openacc, openmp, testsuite] Recursive tests may fail due to thread stack limit
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
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--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #4)
> Committed to trunk.
>
> Approved for 8.2. [ 8.1 release is targeted for Wednesday, May 2nd. ]
Backported to gcc-8-branch after 8.1 release.
Marking resolved-fixed.
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Subject: [Bug c/85608] New: ubsan in cse.c:2194
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85608
Bug ID: 85608
Summary: ubsan in cse.c:2194
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
From the gcc testsuite, the file gcc.dg/pr82596.c, when compiled
by a recent ubsan version of trunk gcc, does this:
$ ~/gcc/results.259742.ubsan/bin/gcc -c -O2 -w ./gcc.dg/pr82596.c
../../trunk/gcc/cse.c:2194:34: runtime error: signed integer overflow: 1 -
-9223372036854775807 cannot be represented in type 'long int'
$
case.c:2194 is this line:
360 kenner offset = (get_integer_term (x) - get_integer_term
(p->exp));
I'll have my usual go at finding a range of revisions and a short test case.
>From gcc-bugs-return-603412-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 11:12:07 2018
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Subject: [Bug c/85608] ubsan in cse.c:2194
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--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
Problem seems to occur sometime before revision 258870.
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Subject: [Bug libstdc++/80165] Constexpr tuple of variant doesn't work
Date: Wed, 02 May 2018 11:25:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|NEW |RESOLVED
Resolution|--- |FIXED
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is fixed in GCC 8.1 and not going to be backported to gcc-7-branch.
>From gcc-bugs-return-603414-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 11:27:13 2018
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Subject: [Bug fortran/85579] [9 regression] SIGSEV in fortran test case gfortran.dg/pr51434.f90 starting with r259754
Date: Wed, 02 May 2018 11:27:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Status|ASSIGNED |NEW
Component|tree-optimization |fortran
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
FE issue I believe.
>From gcc-bugs-return-603415-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 11:34:13 2018
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Subject: [Bug libstdc++/80187] C++ variant should be trivially copy constructible if possible
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--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Tim, can this be closed as fixed in GCC 8.1? Is there more to do?
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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CC| |gcc-bugs at marehr dot dialup.fu-b
| |erlin.de
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 80165 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603416-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 11:56:49 2018
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Subject: [Bug libstdc++/80165] Constexpr tuple of variant doesn't work
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This was fixed by r249706
*** This bug has been marked as a duplicate of bug 80187 ***
>From gcc-bugs-return-603418-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 11:58:25 2018
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From: "janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85599] invalid optimization: function not always evaluated in logical expression
Date: Wed, 02 May 2018 11:58:00 -0000
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--- Comment #6 from janus at gcc dot gnu.org ---
Another variant, this time with the (non-std) intrinsic function AND:
program lazy
logical :: flag
flag = .false.
flag = AND(check(), flag)
flag = AND(flag, check())
contains
logical function check()
integer, save :: i = 1
print *, "check", i
i = i + 1
check = .true.
end function
end
This calls 'check' twice, as I would expect, and -fdump-tree-original shows
that it is translated to this pseudo C code:
flag = check () & flag;
flag = check () & flag;
While the original test case translates to:
flag = check () && flag;
flag = flag && check ();
Changing the operand order (as done in the first case) does not matter here.
Obviously the crucial difference is the use of & vs &&.
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Subject: [Bug c++/85604] Default template arguments in friend class template declarations should not be allowed
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |accepts-invalid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-02
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I thought this was a duplicate of an existing bug but I can only find PR 59480
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--- Comment #7 from janus at gcc dot gnu.org ---
(In reply to janus from comment #4)
> What worries me most is that other compilers choose different
> implementations. Can this kind of code really be processor-dependent?
Most other compilers that I tried actually behave different than gfortran,
calling 'check' twice in the test case of comment #0 (ifort, flang, PGI).
The only compiler that behaves like gfortran and optimizes the second call out
is the Oracle compiler (sunf95).
All gfortran versions since at least 4.4 behave in the same way.
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|8.2 |---
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Subject: [Bug middle-end/85586] [8/9 Regression] Optimizer produces different result on -O2 and -O3
Date: Wed, 02 May 2018 12:13:00 -0000
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Christophe Lyon <clyon at gcc dot gnu.org> changed:
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CC| |clyon at gcc dot gnu.org
--- Comment #7 from Christophe Lyon <clyon at gcc dot gnu.org> ---
Hi Richard,
The new testcase fails on armeb when gcc is configured --with-fpu neon-fp16:
FAIL: gcc.dg/vect/pr85586.c -flto -ffat-lto-objects scan-tree-dump-times vect
"LOOP VECTORIZED" 1
FAIL: gcc.dg/vect/pr85586.c scan-tree-dump-times vect "LOOP VECTORIZED" 1
GCC configure flags:
--target armeb-none-linux-gnueabihf
--with-mode arm
--with-cpu cortex-a9
--with-fpu neon-fp16
Using vfpv3-d16-fp16 as default fpu skips that part of the test.
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Subject: [Bug fortran/84640] gcc/fortran/simplify.c:2587:9: runtime error: pointer index expression with base 0x0000090de160 overflowed to 0xffffffffc0632960
Date: Wed, 02 May 2018 12:15:00 -0000
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David Binderman <dcb314 at hotmail dot com> changed:
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--- Comment #4 from David Binderman <dcb314 at hotmail dot com> ---
I am seeing something similar when compiling the fortran test suite:
./../trunk/gcc/fortran/simplify.c:2174:9: runtime error: pointer index
expression with base 0x00000b26c478 overflowed to 0xfffc05abee0f7cb8
Source code file gfortran.dg/array_simplify_1.f90 seems to demonstrate
the problem.
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Subject: [Bug testsuite/85106] Add scan-ltrans-tree-dump and scan-wpa-ipa-dump
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--- Comment #10 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Wed May 2 12:16:15 2018
New Revision: 259837
URL: https://gcc.gnu.org/viewcvs?rev=259837&root=gcc&view=rev
Log:
[testsuite] Add scan-wpa-ipa-dump
2018-05-02 Tom de Vries <tom@codesourcery.com>
PR testsuite/85106
* gcc.dg/ipa/ipa-icf-38.c: New test.
* gcc.dg/ipa/ipa-icf-38a.c: New test.
* lib/scandump.exp (dump-base): New proc.
(scan-dump, scan-dump-times, scan-dump-not, scan-dump-dem)
(scan-dump-dem-not): Add and handle parameter for suffix of the dump
base.
* lib/scanipa.exp: Add "" argument to scan-dump calls.
* lib/scanlang.exp: Same.
* lib/scanrtl.exp: Same.
* lib/scantree.exp: Same.
* lib/scanwpaipa.exp: New file.
* lib/gcc-dg.exp: Include scanwpaipa.exp.
* testsuite/lib/libatomic.exp: Include scanwpaipa.exp.
* testsuite/lib/libgomp.exp: Include scanwpaipa.exp.
* testsuite/lib/libitm.exp: Include scanwpaipa.exp.
* testsuite/lib/libvtv.exp: Include scanwpaipa.exp.
* doc/sourcebuild.texi (Commands for use in dg-final, Scan optimization
dump files): Add wpa-ipa.
Added:
trunk/gcc/testsuite/gcc.dg/ipa/ipa-icf-38.c
trunk/gcc/testsuite/gcc.dg/ipa/ipa-icf-38a.c
trunk/gcc/testsuite/lib/scanwpaipa.exp
- copied, changed from r259833, trunk/gcc/testsuite/lib/scanipa.exp
Modified:
trunk/gcc/ChangeLog
trunk/gcc/doc/sourcebuild.texi
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/lib/gcc-dg.exp
trunk/gcc/testsuite/lib/scandump.exp
trunk/gcc/testsuite/lib/scanipa.exp
trunk/gcc/testsuite/lib/scanlang.exp
trunk/gcc/testsuite/lib/scanrtl.exp
trunk/gcc/testsuite/lib/scantree.exp
trunk/libatomic/ChangeLog
trunk/libatomic/testsuite/lib/libatomic.exp
trunk/libgomp/ChangeLog
trunk/libgomp/testsuite/lib/libgomp.exp
trunk/libitm/ChangeLog
trunk/libitm/testsuite/lib/libitm.exp
trunk/libvtv/ChangeLog
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Subject: [Bug testsuite/85106] Add scan-ltrans-tree-dump and scan-wpa-ipa-dump
Date: Wed, 02 May 2018 12:17:00 -0000
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--- Comment #11 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Wed May 2 12:16:32 2018
New Revision: 259838
URL: https://gcc.gnu.org/viewcvs?rev=259838&root=gcc&view=rev
Log:
[testsuite] Add scan-ltrans-tree-dump
2018-05-02 Tom de Vries <tom@codesourcery.com>
PR testsuite/85106
* gcc.dg/ipa/ipa-icf-38.c: Use scan-ltrans-tree-dump.
* lib/scanltranstree.exp: New file.
* lib/target-supports.exp (scan-ltrans-tree-dump_required_options)
(scan-ltrans-tree-dump-times_required_options)
(scan-ltrans-tree-dump-not_required_options)
(scan-ltrans-tree-dump-dem_required_options)
(scan-ltrans-tree-dump-dem-not_required_options): New proc.
* lib/gcc-dg.exp: Include scanltranstree.exp.
* testsuite/lib/libatomic.exp: Include scanltranstree.exp.
* testsuite/lib/libgomp.exp: Include scanltranstree.exp.
* testsuite/lib/libitm.exp: Include scanltranstree.exp.
* testsuite/lib/libvtv.exp: Include scanltranstree.exp.
* doc/sourcebuild.texi (Commands for use in dg-final, Scan optimization
dump files): Add ltrans-tree.
Added:
trunk/gcc/testsuite/lib/scanltranstree.exp
Modified:
trunk/gcc/ChangeLog
trunk/gcc/doc/sourcebuild.texi
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/ipa/ipa-icf-38.c
trunk/gcc/testsuite/lib/gcc-dg.exp
trunk/gcc/testsuite/lib/target-supports.exp
trunk/libatomic/ChangeLog
trunk/libatomic/testsuite/lib/libatomic.exp
trunk/libgomp/ChangeLog
trunk/libgomp/testsuite/lib/libgomp.exp
trunk/libitm/ChangeLog
trunk/libitm/testsuite/lib/libitm.exp
trunk/libvtv/ChangeLog
trunk/libvtv/testsuite/lib/libvtv.exp
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Subject: [Bug libstdc++/69608] strsteambuf copy ctor and assignment inaccessible
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-02
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #0)
> As far as I can see, the C++ standard doesn't prevent the copying of
> strstreambuf objects. With the resolution of issue 421 these copies should
> have (almost) well-defined semantics. But the following program fails to
> compile with the latest libstdc++.
>
> That said, I'm not sure it's a good idea for the standard to require
> implementations to accept the program. If it did, it seems that the two
> copies would share the same underlying character buffer (courtesy of issue
> 421). Accessing the buffer in the copy would be undefined after the copied
> strstreambuf object was destroyed.
Simply removing the private copy constructor and copy assignment operator
allows the program to compile, but with undefined behaviour:
==16384== Memcheck, a memory error detector
==16384== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==16384== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==16384== Command: ./a.out
==16384==
==16384== Invalid free() / delete / delete[] / realloc()
==16384== at 0x4C2F6B8: operator delete[](void*) (vg_replace_malloc.c:621)
==16384== by 0x4EE0D08: std::strstreambuf::~strstreambuf()
(strstream.cc:117)
==16384== by 0x400773: main (ss.cc:5)
==16384== Address 0x5ad0cd0 is 0 bytes inside a block of size 32 free'd
==16384== at 0x4C2F6B8: operator delete[](void*) (vg_replace_malloc.c:621)
==16384== by 0x4EE0D08: std::strstreambuf::~strstreambuf()
(strstream.cc:117)
==16384== by 0x400764: main (ss.cc:6)
==16384== Block was alloc'd at
==16384== at 0x4C2E8B7: operator new[](unsigned long)
(vg_replace_malloc.c:423)
==16384== by 0x4EE0C5C: std::strstreambuf::strstreambuf(long)
(strstream.cc:61)
==16384== by 0x400742: main (ss.cc:6)
==16384==
==16384==
==16384== HEAP SUMMARY:
==16384== in use at exit: 16 bytes in 1 blocks
==16384== total heap usage: 3 allocs, 3 frees, 72,752 bytes allocated
==16384==
==16384== LEAK SUMMARY:
==16384== definitely lost: 16 bytes in 1 blocks
==16384== indirectly lost: 0 bytes in 0 blocks
==16384== possibly lost: 0 bytes in 0 blocks
==16384== still reachable: 0 bytes in 0 blocks
==16384== suppressed: 0 bytes in 0 blocks
==16384== Rerun with --leak-check=full to see details of leaked memory
==16384==
==16384== For counts of detected and suppressed errors, rerun with: -v
==16384== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
> If this hasn't been discussed in LWG yet
> it might be worth bringing it up.
I'll do so.
> strstreambuf may be deprecated but the
> same concern applies to similar user-defined classes that publicly derive
> from basic_streambuf and expose an accsible copy ctor or assignment operator
> of their own.
User-defined classes are responsible for defining their own copy operations
correctly. The issue as I see it is that strstreambuf fails to do that. If
user-defined classes fail to do that it's the user's problem.
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Subject: [Bug testsuite/85106] Add scan-ltrans-tree-dump and scan-wpa-ipa-dump
Date: Wed, 02 May 2018 12:22:00 -0000
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #12 from Tom de Vries <vries at gcc dot gnu.org> ---
patches with test-cases committed, marking resolved-fixed.
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Subject: [Bug libstdc++/69388] Allow functexcept.cc definitions to be replaced
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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-603429-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 13:39:19 2018
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Subject: [Bug lto/85609] New: lto_check_version should print file name when linking a static lib
Date: Wed, 02 May 2018 13:39:00 -0000
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Bug ID: 85609
Summary: lto_check_version should print file name when linking
a static lib
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
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The current error message is not very helpful when linking against a static lib
instead of object files:
"lto1: fatal error: bytecode stream in file 'libwebkitfltk.a' generated with
LTO version 4.0 instead of the expected 6.0"
In this case, the lib has 3268 .o files. If the file is a lib, the error
message should include the .o file's filename too.
--
Is there any way to examine a file's LTO version? I tried dumping sections with
readelf, but nothing jumped at me.
>From gcc-bugs-return-603430-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 13:47:26 2018
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Subject: [Bug fortran/85599] invalid optimization: function not always evaluated in logical expression
Date: Wed, 02 May 2018 13:47:00 -0000
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--- Comment #8 from janus at gcc dot gnu.org ---
I also asked for advice on c.l.f.:
https://groups.google.com/forum/#!topic/comp.lang.fortran/fXP1c0u57So
>From gcc-bugs-return-603431-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 13:51:18 2018
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Subject: [Bug lto/85609] lto_check_version should print file name when linking a static lib
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
There's no way to easily dump them since the sections where they are included
are compressed... We do not know the file name in the archive but only its
byte offset.
There's currently a dumping too in development that should eventually solve
the "print the LTO version of a file" issue.
>From gcc-bugs-return-603432-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 14:20:29 2018
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Subject: [Bug tree-optimization/85597] [6/7/8/9 Regression] internal compiler error: in compute_live_loop_exits, at tree-ssa-loop-manip.c:229
Date: Wed, 02 May 2018 14:20:00 -0000
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed May 2 14:19:51 2018
New Revision: 259840
URL: https://gcc.gnu.org/viewcvs?rev=259840&root=gcc&view=rev
Log:
2018-05-02 Richard Biener <rguenther@suse.de>
PR tree-optimization/85597
* tree-vect-stmts.c (vectorizable_operation): For ternary SLP
do not use split vect_get_vec_defs call but call vect_get_slp_defs
directly.
* gcc.dg/vect/pr85597.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/vect/pr85597.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vect-stmts.c
>From gcc-bugs-return-603433-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 14:21:30 2018
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Subject: [Bug tree-optimization/85597] [6/7/8 Regression] internal compiler error: in compute_live_loop_exits, at tree-ssa-loop-manip.c:229
Date: Wed, 02 May 2018 14:21:00 -0000
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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] |[6/7/8 Regression] internal
|internal compiler error: in |compiler error: in
|compute_live_loop_exits, at |compute_live_loop_exits, at
|tree-ssa-loop-manip.c:229 |tree-ssa-loop-manip.c:229
Known to fail| |8.1.0
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
>From gcc-bugs-return-603434-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 14:22:54 2018
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From: "hiraditya at msn dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85610] New: Unable to optimize away mov followed by compare into a cmpb in case of atomic_load
Date: Wed, 02 May 2018 14:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85610
Bug ID: 85610
Summary: Unable to optimize away mov followed by compare into a
cmpb in case of atomic_load
Product: gcc
Version: tree-ssa
Status: UNCONFIRMED
Severity: normal
Priority: P3
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$ cat test.cpp
#include <atomic>
std::atomic<bool> flag_atomic{false};
extern void f1();
extern void f2();
void foo() {
bool b = flag_atomic.load(std::memory_order_relaxed);
if (b == false) {
f1();
} else {
f2();
}
}
$ g++-7 -O3 -S -o - test.cpp -std=c++14
__Z3foov:
LFB342:
movzbl _flag_atomic(%rip), %eax
testb %al, %al
je L4
jmp __Z2f2v
.align 4,0x90
L4:
jmp __Z2f1v
We could just use `cmpb $0, _flag_atomic(%rip)` and avoid a register in this
case. When _flag_atomic is a scalar boolean global variable, that's what
happens.
>From gcc-bugs-return-603435-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 14:50:02 2018
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Subject: [Bug tree-optimization/85611] New: Suboptimal code generation for (potentially) redundant atomic loads
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Bug ID: 85611
Summary: Suboptimal code generation for (potentially) redundant
atomic loads
Product: gcc
Version: tree-ssa
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: hiraditya at msn dot com
Target Milestone: ---
$ cat test.cpp
#include <atomic>
std::atomic<int> atomic_var{100};
int somevar;
bool cond;
void run1() {
auto a = atomic_var.load(std::memory_order_relaxed);
auto b = atomic_var.load(std::memory_order_relaxed);
// Some code using a and b;
}
void run2() {
if (atomic_var.load(std::memory_order_relaxed) == 2 && cond) {
if (atomic_var.load(std::memory_order_relaxed) * somevar > 3) {
/*...*/
}
}
}
$ g++-7 -O3 -std=c++17 -S -o - test.cpp -fno-exceptions
.text
.align 4,0x90
.globl __Z4run1v
__Z4run1v:
LFB339:
movl _atomic_var(%rip), %eax
movl _atomic_var(%rip), %eax
ret
LFE339:
.align 4,0x90
.globl __Z4run2v
__Z4run2v:
LFB340:
movl _atomic_var(%rip), %eax
cmpl $2, %eax
je L5
L3:
ret
.align 4,0x90
L5:
cmpb $0, _cond(%rip)
je L3
movl _atomic_var(%rip), %eax
ret
>From gcc-bugs-return-603436-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 14:56:01 2018
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From: "sgk at troutmask dot apl.washington.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85599] invalid optimization: function not always evaluated in logical expression
Date: Wed, 02 May 2018 14:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85599
--- Comment #9 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Wed, May 02, 2018 at 08:53:27AM +0000, janus at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85599
>
> --- Comment #4 from janus at gcc dot gnu.org ---
> (In reply to kargl from comment #1)
> > The behavior may not be buggy, and it's best not to depend
> > on side-effects. From F2018,
> >
> > 10.1.5.4.2 Evaluation of logical intrinsic operations
> >
> > Once the interpretation of a logical intrinsic operation is
> > established, the processor may evaluate any other expression
> > that is logically equivalent, provided that the integrity of
> > parentheses in any expression is not violated.
> >
> > Two expressions of type logical are logically equivalent
> > if their values are equal for all possible values of their
> > primaries.
> >
>
> Thanks for the standard quote, Steve. It certainly goes in
> the right direction, but I feel like it's not quite to the point.
>
> Some other (possibly) relevant passages I found in the 2008 standard:
>
> *****
> 7.1.7 Evaluation of operands
> 1 It is not necessary for a processor to evaluate all of the operands of an
> expression, or to evaluate entirely each operand, if the value of the
> expression can be determined otherwise.
> *****
The above is actually the clause I went looking for, but I was
short on time yesterday. I think that this is the one along with
the description of evaluation of a logical expression that
applies.
> That also sounds like optimizing away the function call might be valid, but
> then there is also this one:
>
> *****
> 7.1.4 Evaluation of operations
> 2 The evaluation of a function reference shall neither affect nor be affected
> by the evaluation of any other entity within the statement.
> *****
You could be right in that this clause applies. I, however,
tend to think that this is meant to prevent a side effect
such as
program foo
integer i, j
integer, external :: ping, pong
common /ah/i
i = 1
j = ping() + pong() ! ping() changes value of i
print *, pong(), j ! which effects the output of pong()
i = 1
j = pong() + ping()
print *, pong(), j
end program foo
function ping() result(n)
integer k
common /ah/ k
k = k + 1
n = 42
end function ping
function pong() result(n)
common /ah/ m
if (m > 0) then
n = m
else
n = 0
end if
end function pong
Yes, it is admittedly a contrived example. It is also possible
for a compiler to replace
j = 0 * ping() + pong()
with simply
j = pong()
where ping() is never evaluated. I'll note that gfortran currently
will evaluate ping(), but if ping() takes ages to compute it might
be nice to have -ffrontend-optimize remove its evaluation.
> What worries me most is that other compilers choose different implementations.
> Can this kind of code really be processor-dependent?
Yes, that is troublesome.
>From gcc-bugs-return-603437-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 15:01:28 2018
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From: "barry.revzin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85612] New: ADL lookup with parameter pack and defaulted argument not considered ambiguous
Date: Wed, 02 May 2018 15:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85612
Bug ID: 85612
Summary: ADL lookup with parameter pack and defaulted argument
not considered ambiguous
Product: gcc
Version: 7.2.0
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Severity: normal
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Hopefully-minimal example:
#ifdef WORKS
template <typename... T, typename R=int>
R foo(T&&...) {
return 0;
}
#else
template <typename... T>
decltype(auto) foo(T&&...) {
return 0;
}
#endif
namespace N {
struct X { };
template <typename... T>
void foo(T&&...) = delete;
}
int main() {
foo(N::X{});
}
gcc accepts this program with -DWORKS, but this should be ambiguous between
::foo and N::foo. It correctly rejects without -DWORKS. clang rejects in both
cases.
The parameter pack is significant somehow too, if the parameter list were just
T&& instead of T&&..., gcc rejects as ambiguous with -DWORKS too.
>From gcc-bugs-return-603438-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 15:07:23 2018
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From: "ramana at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85593] GCC on ARM allocates R3 for local variable when calling naked function with O2 optimizations enabled
Date: Wed, 02 May 2018 15:07:00 -0000
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Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ramana at gcc dot gnu.org
--- Comment #3 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
Changing the testcase to indicate the clobbered register r3 makes the test pass
but that is wrong in a naked function. Extended inline assembler *cannot* be
used within a naked function because you inadvertently could end up requiring a
stack slot and therefore cause the function to require a prologue and epilogue
which is exactly contrary to what we want with the naked function !
I *think* the problem really is the fact that you have ipa-ra coming along and
deciding that r3 isn't used at all in the naked function . You can see the
problem disappear with -fno-ipa-ra but that is not a workaround I would
recommend using in your general C flags , because you are using a hammer
disabling a nice optimization to make something like the example "work".
Thus I think what you want is to get rid of naked functions in general and
write the whole thing in assembler and stop faffing about with naked functions
in general. IIRC there is a hook for ipa-ra that says what registers can be
clobbered : can't find it immediately. I suppose for naked functions it is
*all* registers.
regards
Ramana
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Subject: [Bug fortran/78798] [cleanup] some int-valued functions should be bool
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
It'd be cool if GCC had a warning flag ("-Wsuggest-bool" perhaps?) to help find
cases like these.
>From gcc-bugs-return-603440-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 15:17:23 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/80187] C++ variant should be trivially copy constructible if possible
Date: Wed, 02 May 2018 15:17:00 -0000
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Tim Shen <timshen at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #9 from Tim Shen <timshen at gcc dot gnu.org> ---
Fixed in GCC 8.1.
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Subject: [Bug libstdc++/80187] C++ variant should be trivially copy constructible if possible
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug c/79586] missing -Wdeprecated depending on position of attribute
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=80400,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=80398,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=82200
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
See bug 80400, bug 80398, and bug 82200 for more bugs about misplaced
attributes.
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Subject: [Bug target/85613] New: [8/9 regression] FAIL: gfortran.dg/pr51434.f90 -O1 execution test
Date: Wed, 02 May 2018 16:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85613
Bug ID: 85613
Summary: [8/9 regression] FAIL: gfortran.dg/pr51434.f90 -O1
execution test
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: wrong-code
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Target: powerpc*-*-*
The test crashes at -O1, but not on other opt levels. The offset from
.LANCHOR0 is miscalculated for the A.1.2066 object, at -O1 there is another
object (c.2059) placed before it.
-O2 vs -O1:
.globl __foo_MOD_s
.globl __foo_MOD___vtab_foo_A
.globl __foo_MOD___def_init_foo_A
- .set c.2059,__foo_MOD___def_init_foo_A
.section .rodata
.align 2
.set .LANCHOR0,. + 0
@@ -86,6 +81,28 @@ options.3.2073:
.long 1
.long 0
.long 31
+ .type c.2059, @object
+ .size c.2059, 12
+c.2059:
+ .long 5
+ .ascii "a"
+ .ascii "b"
+ .ascii "c"
+ .ascii "d"
+ .ascii "e"
+ .ascii " "
+ .ascii " "
+ .ascii " "
+ .ascii " "
+ .ascii " "
+ .ascii " "
+ .ascii " "
+ .ascii " "
+ .ascii " "
+ .ascii " "
+ .ascii " "
+ .ascii " "
+ .ascii " "
.type A.1.2066, @object
.size A.1.2066, 20
A.1.2066:
>From gcc-bugs-return-603444-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 16:26:21 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/69608] strsteambuf copy ctor and assignment inaccessible
Date: Wed, 02 May 2018 16:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69608
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed May 2 16:25:44 2018
New Revision: 259842
URL: https://gcc.gnu.org/viewcvs?rev=259842&root=gcc&view=rev
Log:
PR libstdc++/69608 Move semantics for strstreambuf
In libstdc++ the deprecated char* streams are non-copyable, as was
required pre-C++11.
Since C++11 the standard implies that those streams should be copyable,
but doesn't specify the effects of copying them. This is surely a
defect, so for consistency with other implementations this change makes
them movable, but not copyable.
PR libstdc++/69608
* include/backward/strstream (strstreambuf): Define move constructor
and move assignment operator.
(istrstream, ostrstream, strstream): Likewise.
* testsuite/backward/strstream_move.cc: New.
Added:
trunk/libstdc++-v3/testsuite/backward/strstream_move.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/backward/strstream
>From gcc-bugs-return-603446-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 16:35:57 2018
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Subject: [Bug libstdc++/69608] strsteambuf copy ctor and assignment inaccessible
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I've made strstreams movable for GCC 9 and requested a new LWG issue.
>From gcc-bugs-return-603445-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 16:35:44 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85605] Potentially missing optimization under x64 and ARM: seemingly unnecessary branch in codegen
Date: Wed, 02 May 2018 16:35:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|x86_64-*-*, i?86-*-*, arm |x86_64-*-*, i?86-*-*, arm,
| |aarch64*-*-*
Component|rtl-optimization |tree-optimization
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There might be a duplicate of this bug already but:
CMP1 ? true : CMP2;
Can be transformed into:
CMP1 | CMP2
This needs PHIOPT to do the optimization, either via match or manually.
>From gcc-bugs-return-603447-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 16:40:46 2018
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Subject: [Bug libstdc++/70080] gslice_array's copy constructor doesn't work correctly
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-02
Ever confirmed|0 |1
>From gcc-bugs-return-603448-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 16:42:29 2018
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Subject: [Bug libstdc++/57997] Segmentation fault after returning valarray expression from an auto function
Date: Wed, 02 May 2018 16:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57997
--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed May 2 16:41:46 2018
New Revision: 259844
URL: https://gcc.gnu.org/viewcvs?rev=259844&root=gcc&view=rev
Log:
PR libstdc++/83860 avoid dangling references in valarray closure types
Store nested closures by value not by reference, to prevent holding
invalid references to temporaries that have been destroyed. This
changes the layout of the closure types, so change their linkage names,
but moving them to a different namespace.
PR libstdc++/57997
PR libstdc++/83860
* include/bits/gslice_array.h (gslice_array): Define default
constructor as deleted, as per C++11 standard.
* include/bits/mask_array.h (mask_array): Likewise.
* include/bits/slice_array.h (slice_array): Likewise.
* include/bits/valarray_after.h (_GBase, _GClos, _IBase, _IClos): Move
to namespace __detail.
(_GBase::_M_expr, _IBase::_M_expr): Use _ValArrayRef for type of data
members.
* include/bits/valarray_before.h (_ValArrayRef): New helper for type
of data members in closure objects.
(_FunBase, _ValFunClos, _RefFunClos, _UnBase, _UnClos, _BinBase)
(_BinBase2, _BinBase1, _BinClos, _SBase, _SClos): Move to namespace
__detail.
(_FunBase::_M_expr, _UnBase::_M_expr, _BinBase::_M_expr1)
(_BinBase::_M_expr2, _BinBase2::_M_expr1, _BinBase1::_M_expr2)
(_SBase::_M_expr): Use _ValArrayRef for type of data members.
* include/std/valarray (_UnClos, _BinClos, _SClos, _GClos, _IClos)
(_ValFunClos, _RefFunClos): Move to namespace __detail and add
using-declarations to namespace std.
* testsuite/26_numerics/valarray/83860.cc: New.
Added:
trunk/libstdc++-v3/testsuite/26_numerics/valarray/83860.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/bits/gslice_array.h
trunk/libstdc++-v3/include/bits/mask_array.h
trunk/libstdc++-v3/include/bits/slice_array.h
trunk/libstdc++-v3/include/bits/valarray_after.h
trunk/libstdc++-v3/include/bits/valarray_before.h
trunk/libstdc++-v3/include/std/valarray
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Subject: [Bug libstdc++/83860] valarray replacement type breaks with auto and more than one operation
Date: Wed, 02 May 2018 16:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83860
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed May 2 16:41:46 2018
New Revision: 259844
URL: https://gcc.gnu.org/viewcvs?rev=259844&root=gcc&view=rev
Log:
PR libstdc++/83860 avoid dangling references in valarray closure types
Store nested closures by value not by reference, to prevent holding
invalid references to temporaries that have been destroyed. This
changes the layout of the closure types, so change their linkage names,
but moving them to a different namespace.
PR libstdc++/57997
PR libstdc++/83860
* include/bits/gslice_array.h (gslice_array): Define default
constructor as deleted, as per C++11 standard.
* include/bits/mask_array.h (mask_array): Likewise.
* include/bits/slice_array.h (slice_array): Likewise.
* include/bits/valarray_after.h (_GBase, _GClos, _IBase, _IClos): Move
to namespace __detail.
(_GBase::_M_expr, _IBase::_M_expr): Use _ValArrayRef for type of data
members.
* include/bits/valarray_before.h (_ValArrayRef): New helper for type
of data members in closure objects.
(_FunBase, _ValFunClos, _RefFunClos, _UnBase, _UnClos, _BinBase)
(_BinBase2, _BinBase1, _BinClos, _SBase, _SClos): Move to namespace
__detail.
(_FunBase::_M_expr, _UnBase::_M_expr, _BinBase::_M_expr1)
(_BinBase::_M_expr2, _BinBase2::_M_expr1, _BinBase1::_M_expr2)
(_SBase::_M_expr): Use _ValArrayRef for type of data members.
* include/std/valarray (_UnClos, _BinClos, _SClos, _GClos, _IClos)
(_ValFunClos, _RefFunClos): Move to namespace __detail and add
using-declarations to namespace std.
* testsuite/26_numerics/valarray/83860.cc: New.
Added:
trunk/libstdc++-v3/testsuite/26_numerics/valarray/83860.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/bits/gslice_array.h
trunk/libstdc++-v3/include/bits/mask_array.h
trunk/libstdc++-v3/include/bits/slice_array.h
trunk/libstdc++-v3/include/bits/valarray_after.h
trunk/libstdc++-v3/include/bits/valarray_before.h
trunk/libstdc++-v3/include/std/valarray
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Subject: [Bug libstdc++/57997] Segmentation fault after returning valarray expression from an auto function
Date: Wed, 02 May 2018 16:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57997
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The original testcase works on trunk, although it's still possible to create
dangling references from valarray expressions by using `auto` (especially in
functions returning `auto` or `decltype(auto)` which end up returning an
expression template referring to a local valarray on the function's stack).
>From gcc-bugs-return-603451-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 16:49:05 2018
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Subject: [Bug libstdc++/83860] valarray replacement type breaks with auto and more than one operation
Date: Wed, 02 May 2018 16:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83860
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Known to fail| |8.1.0
--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The original testcase works on trunk, although it's still possible to create
dangling references from valarray expressions by using `auto` (especially in
functions returning `auto` or `decltype(auto)` which end up returning an
expression template referring to a local valarray on the function's stack).
>From gcc-bugs-return-603452-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 16:52:50 2018
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From: "zbeekman at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85507] [6/7/8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
Date: Wed, 02 May 2018 16:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85507
--- Comment #14 from Zaak <zbeekman at gmail dot com> ---
Damn, it would have been nice if this patch made it in.
>From gcc-bugs-return-603453-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 16:59:50 2018
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From: "krblock at computer dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug other/85614] New: Documentation: -fdump-tree should mention "original"
Date: Wed, 02 May 2018 16:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85614
Bug ID: 85614
Summary: Documentation: -fdump-tree should mention "original"
Product: gcc
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In the -fdump-tree option a "switch" is specified to select when you want the
dump. To determine the "switch", it suggests "-fdump-passes" be used. However,
this does not list "original" which is also a possible choice. This should be
explicitly listed in the documentation. Not sure if there are other not listed
"switches". Also the term "switch" is odd. "pass" might be a more intuitive
name.
https://gcc.gnu.org/onlinedocs/gcc/Developer-Options.html
-fdump-tree-all
-fdump-tree-switch
-fdump-tree-switch-options
-fdump-tree-switch-options=filename
...
1. Invoke GCC with -fdump-passes and in the stderr output look for a code that
corresponds to the pass you are interested in. For example, the codes
tree-evrp, tree-vrp1, and tree-vrp2 correspond to the three Value Range
Propagation passes. The number at the end distinguishes distinct invocations of
the same pass.
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Subject: [Bug c/30552] gcc crashes when compiling examples with GNU statement expressions in VLAs (also involved: nested functions declared K&R-style)
Date: Wed, 02 May 2018 17:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=30552
--- Comment #10 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed May 2 17:22:26 2018
New Revision: 259849
URL: https://gcc.gnu.org/viewcvs?rev=259849&root=gcc&view=rev
Log:
PR c/30552
* c-decl.c (old_style_parameter_scope): New function.
* c-parser.c (c_parser_postfix_expression): Check for statement
expressions in old-style function parameter list declarations.
* c-parser.h (old_style_parameter_scope): New extern declaration.
PR c/30552
* gcc.dg/noncompile/pr30552-1.c: New test.
* gcc.dg/noncompile/pr30552-2.c: New test.
* gcc.dg/noncompile/pr30552-3.c: New test.
* gcc.dg/noncompile/pr30552-4.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/noncompile/pr30552-1.c
trunk/gcc/testsuite/gcc.dg/noncompile/pr30552-2.c
trunk/gcc/testsuite/gcc.dg/noncompile/pr30552-3.c
trunk/gcc/testsuite/gcc.dg/noncompile/pr30552-4.c
Modified:
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-decl.c
trunk/gcc/c/c-parser.c
trunk/gcc/c/c-parser.h
trunk/gcc/testsuite/ChangeLog
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug testsuite/83791] Move tests to libgomp.c-c++-common
Date: Wed, 02 May 2018 17:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83791
--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Wed May 2 17:53:43 2018
New Revision: 259851
URL: https://gcc.gnu.org/viewcvs?rev=259851&root=gcc&view=rev
Log:
[libgomp, testsuite] Move tests to libgomp.c-c++-common
2018-05-02 Tom de Vries <tom@codesourcery.com>
PR testsuite/83791
* testsuite/libgomp.c++/udr-9.C: Update.
* testsuite/libgomp.c++/atomic-16.C: Remove.
* testsuite/libgomp.c++/cancel-taskgroup-2.C: Remove.
* testsuite/libgomp.c++/loop-13.C: Remove.
* testsuite/libgomp.c++/loop-14.C: Remove.
* testsuite/libgomp.c++/loop-15.C: Remove.
* testsuite/libgomp.c++/monotonic-1.C: Remove.
* testsuite/libgomp.c++/monotonic-2.C: Remove.
* testsuite/libgomp.c++/nonmonotonic-1.C: Remove.
* testsuite/libgomp.c++/nonmonotonic-2.C: Remove.
* testsuite/libgomp.c++/ordered-1.C: Remove.
* testsuite/libgomp.c++/pr45784.C: Remove.
* testsuite/libgomp.c++/pr64824.C: Remove.
* testsuite/libgomp.c++/pr64868.C: Remove.
* testsuite/libgomp.c++/pr66199-1.C: Remove.
* testsuite/libgomp.c++/pr66199-2.C: Remove.
* testsuite/libgomp.c++/pr66199-3.C: Remove.
* testsuite/libgomp.c++/pr66199-4.C: Remove.
* testsuite/libgomp.c++/pr66199-5.C: Remove.
* testsuite/libgomp.c++/pr66199-6.C: Remove.
* testsuite/libgomp.c++/pr66199-7.C: Remove.
* testsuite/libgomp.c++/pr66199-8.C: Remove.
* testsuite/libgomp.c++/pr66199-9.C: Remove.
* testsuite/libgomp.c++/pr69389.C: Remove.
* testsuite/libgomp.c++/simd10.C: Remove.
* testsuite/libgomp.c++/simd11.C: Remove.
* testsuite/libgomp.c++/simd12.C: Remove.
* testsuite/libgomp.c++/simd13.C: Remove.
* testsuite/libgomp.c++/target-1.C: Remove.
* testsuite/libgomp.c++/target-3.C: Remove.
* testsuite/libgomp.c++/target-4.C: Remove.
* testsuite/libgomp.c++/target-5.C: Remove.
* testsuite/libgomp.c++/taskgroup-1.C: Remove.
* testsuite/libgomp.c++/taskloop-1.C: Remove.
* testsuite/libgomp.c++/taskloop-2.C: Remove.
* testsuite/libgomp.c++/taskloop-3.C: Remove.
* testsuite/libgomp.c++/taskloop-4.C: Remove.
* testsuite/libgomp.c++/udr-9.C: Remove.
* testsuite/libgomp.c++/for-10.C: Remove.
* testsuite/libgomp.c++/for-11.C: Remove.
* testsuite/libgomp.c++/for-12.C: Remove.
* testsuite/libgomp.c++/for-13.C: Remove.
* testsuite/libgomp.c++/for-14.C: Remove.
* testsuite/libgomp.c++/for-9.C: Remove.
* testsuite/libgomp.c/atomic-18.c: Move ...
* testsuite/libgomp.c-c++-common/atomic-18.c: ... here.
* testsuite/libgomp.c/cancel-taskgroup-2.c: Move ...
* testsuite/libgomp.c-c++-common/cancel-taskgroup-2.c: here.
* testsuite/libgomp.c/loop-13.c: Move ...
* testsuite/libgomp.c-c++-common/loop-13.c: ... here.
* testsuite/libgomp.c/loop-14.c: Move ...
* testsuite/libgomp.c-c++-common/loop-14.c: ... here.
* testsuite/libgomp.c/loop-15.c: Remove.
* testsuite/libgomp.c-c++-common/loop-15.c: New test.
* testsuite/libgomp.c/monotonic-1.c: Move ...
* testsuite/libgomp.c-c++-common/monotonic-1.c: ... here.
* testsuite/libgomp.c/monotonic-2.c: Move ...
* testsuite/libgomp.c-c++-common/monotonic-2.c: ... here.
* testsuite/libgomp.c/nonmonotonic-1.c: Move ...
* testsuite/libgomp.c-c++-common/nonmonotonic-1.c: ... here.
* testsuite/libgomp.c/nonmonotonic-2.c: Move ...
* testsuite/libgomp.c-c++-common/nonmonotonic-2.c: ... here.
* testsuite/libgomp.c/ordered-4.c: Move ...
* testsuite/libgomp.c-c++-common/ordered-4.c: ... here.
* testsuite/libgomp.c/pr45784.c: Move ...
* testsuite/libgomp.c-c++-common/pr45784.c: ... here.
* testsuite/libgomp.c/pr64824.c: Move ...
* testsuite/libgomp.c-c++-common/pr64824.c: ... here.
* testsuite/libgomp.c/pr64868.c: Move ...
* testsuite/libgomp.c-c++-common/pr64868.c: ... here.
* testsuite/libgomp.c/pr66199-1.c: Move ...
* testsuite/libgomp.c-c++-common/pr66199-1.c: ... here.
* testsuite/libgomp.c/pr66199-2.c: Move ...
* testsuite/libgomp.c-c++-common/pr66199-2.c: ... here.
* testsuite/libgomp.c/pr66199-3.c: Move ...
* testsuite/libgomp.c-c++-common/pr66199-3.c: ... here.
* testsuite/libgomp.c/pr66199-4.c: Move ...
* testsuite/libgomp.c-c++-common/pr66199-4.c: ... here.
* testsuite/libgomp.c/pr66199-5.c: Move ...
* testsuite/libgomp.c-c++-common/pr66199-5.c: ... here.
* testsuite/libgomp.c/pr66199-6.c: Move ...
* testsuite/libgomp.c-c++-common/pr66199-6.c: ... here.
* testsuite/libgomp.c/pr66199-7.c: Move ...
* testsuite/libgomp.c-c++-common/pr66199-7.c: ... here.
* testsuite/libgomp.c/pr66199-8.c: Move ...
* testsuite/libgomp.c-c++-common/pr66199-8.c: ... here.
* testsuite/libgomp.c/pr66199-9.c: Move ...
* testsuite/libgomp.c-c++-common/pr66199-9.c: ... here.
* testsuite/libgomp.c/pr69389.c: Move ...
* testsuite/libgomp.c-c++-common/pr69389.c: ... here.
* testsuite/libgomp.c/simd-14.c: Move ...
* testsuite/libgomp.c-c++-common/simd-14.c: ... here.
* testsuite/libgomp.c/simd-15.c: Move ...
* testsuite/libgomp.c-c++-common/simd-15.c: ... here.
* testsuite/libgomp.c/simd-16.c: Move ...
* testsuite/libgomp.c-c++-common/simd-16.c: ... here.
* testsuite/libgomp.c/simd-17.c: Move ...
* testsuite/libgomp.c-c++-common/simd-17.c: ... here.
* testsuite/libgomp.c/target-1.c: Move ...
* testsuite/libgomp.c-c++-common/target-1.c: ... here.
* testsuite/libgomp.c/target-10.c: Move ...
* testsuite/libgomp.c-c++-common/target-10.c: ... here.
* testsuite/libgomp.c/target-13.c: Move ...
* testsuite/libgomp.c-c++-common/target-13.c: ... here.
* testsuite/libgomp.c/target-2.c: Move ...
* testsuite/libgomp.c-c++-common/target-2.c: ... here.
* testsuite/libgomp.c/taskgroup-1.c: Move ...
* testsuite/libgomp.c-c++-common/taskgroup-1.c: ... here.
* testsuite/libgomp.c/taskloop-1.c: Move ...
* testsuite/libgomp.c-c++-common/taskloop-1.c: ... here.
* testsuite/libgomp.c/taskloop-2.c: Move ...
* testsuite/libgomp.c-c++-common/taskloop-2.c: ... here.
* testsuite/libgomp.c/taskloop-3.c: Move ...
* testsuite/libgomp.c-c++-common/taskloop-3.c: ... here.
* testsuite/libgomp.c/taskloop-4.c: Move ...
* testsuite/libgomp.c-c++-common/taskloop-4.c: ... here.
* testsuite/libgomp.c/udr-1.c: Move ...
* testsuite/libgomp.c-c++-common/udr-1.c: ... here.
* testsuite/libgomp.c/for-1.c: Move ...
* testsuite/libgomp.c-c++-common/for-1.c: ... here.
* testsuite/libgomp.c/for-1.h: Move ...
* testsuite/libgomp.c-c++-common/for-1.h: ... here.
* testsuite/libgomp.c/for-2.c: Move ...
* testsuite/libgomp.c-c++-common/for-2.c: ... here.
* testsuite/libgomp.c/for-2.h: Move ...
* testsuite/libgomp.c-c++-common/for-2.h: ... here.
* testsuite/libgomp.c/for-3.c: Move ...
* testsuite/libgomp.c-c++-common/for-3.c: ... here.
* testsuite/libgomp.c/for-4.c: Move ...
* testsuite/libgomp.c-c++-common/for-4.c: ... here.
* testsuite/libgomp.c/for-5.c: Move ...
* testsuite/libgomp.c-c++-common/for-5.c: ... here.
* testsuite/libgomp.c/for-6.c: Move ...
* testsuite/libgomp.c-c++-common/for-6.c: ... here.
Added:
trunk/libgomp/testsuite/libgomp.c-c++-common/atomic-18.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/atomic-18.c
trunk/libgomp/testsuite/libgomp.c-c++-common/cancel-taskgroup-2.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/cancel-taskgroup-2.c
trunk/libgomp/testsuite/libgomp.c-c++-common/for-1.c
- copied, changed from r259850, trunk/libgomp/testsuite/libgomp.c/for-1.c
trunk/libgomp/testsuite/libgomp.c-c++-common/for-1.h
- copied, changed from r259850, trunk/libgomp/testsuite/libgomp.c/for-1.h
trunk/libgomp/testsuite/libgomp.c-c++-common/for-2.c
- copied, changed from r259850, trunk/libgomp/testsuite/libgomp.c/for-2.c
trunk/libgomp/testsuite/libgomp.c-c++-common/for-2.h
- copied, changed from r259850, trunk/libgomp/testsuite/libgomp.c/for-2.h
trunk/libgomp/testsuite/libgomp.c-c++-common/for-3.c
- copied, changed from r259850, trunk/libgomp/testsuite/libgomp.c/for-3.c
trunk/libgomp/testsuite/libgomp.c-c++-common/for-4.c
- copied, changed from r259850, trunk/libgomp/testsuite/libgomp.c/for-4.c
trunk/libgomp/testsuite/libgomp.c-c++-common/for-5.c
- copied, changed from r259850, trunk/libgomp/testsuite/libgomp.c/for-5.c
trunk/libgomp/testsuite/libgomp.c-c++-common/for-6.c
- copied, changed from r259850, trunk/libgomp/testsuite/libgomp.c/for-6.c
trunk/libgomp/testsuite/libgomp.c-c++-common/loop-13.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/loop-13.c
trunk/libgomp/testsuite/libgomp.c-c++-common/loop-14.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/loop-14.c
trunk/libgomp/testsuite/libgomp.c-c++-common/loop-15.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/loop-15.c
trunk/libgomp/testsuite/libgomp.c-c++-common/monotonic-1.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/monotonic-1.c
trunk/libgomp/testsuite/libgomp.c-c++-common/monotonic-2.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/monotonic-2.c
trunk/libgomp/testsuite/libgomp.c-c++-common/nonmonotonic-1.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/nonmonotonic-1.c
trunk/libgomp/testsuite/libgomp.c-c++-common/nonmonotonic-2.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/nonmonotonic-2.c
trunk/libgomp/testsuite/libgomp.c-c++-common/ordered-4.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/ordered-4.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr45784.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr45784.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr64824.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr64824.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr64868.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr64868.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr66199-1.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr66199-1.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr66199-2.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr66199-2.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr66199-3.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr66199-3.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr66199-4.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr66199-4.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr66199-5.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr66199-5.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr66199-6.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr66199-6.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr66199-7.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr66199-7.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr66199-8.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr66199-8.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr66199-9.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr66199-9.c
trunk/libgomp/testsuite/libgomp.c-c++-common/pr69389.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/pr69389.c
trunk/libgomp/testsuite/libgomp.c-c++-common/simd-14.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/simd-14.c
trunk/libgomp/testsuite/libgomp.c-c++-common/simd-15.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/simd-15.c
trunk/libgomp/testsuite/libgomp.c-c++-common/simd-16.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/simd-16.c
trunk/libgomp/testsuite/libgomp.c-c++-common/simd-17.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/simd-17.c
trunk/libgomp/testsuite/libgomp.c-c++-common/target-1.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/target-1.c
trunk/libgomp/testsuite/libgomp.c-c++-common/target-10.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/target-10.c
trunk/libgomp/testsuite/libgomp.c-c++-common/target-13.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/target-13.c
trunk/libgomp/testsuite/libgomp.c-c++-common/target-2.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/target-2.c
trunk/libgomp/testsuite/libgomp.c-c++-common/taskgroup-1.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/taskgroup-1.c
trunk/libgomp/testsuite/libgomp.c-c++-common/taskloop-1.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/taskloop-1.c
trunk/libgomp/testsuite/libgomp.c-c++-common/taskloop-2.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/taskloop-2.c
trunk/libgomp/testsuite/libgomp.c-c++-common/taskloop-3.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/taskloop-3.c
trunk/libgomp/testsuite/libgomp.c-c++-common/taskloop-4.c
- copied, changed from r259850,
trunk/libgomp/testsuite/libgomp.c/taskloop-4.c
trunk/libgomp/testsuite/libgomp.c-c++-common/udr-1.c
- copied, changed from r259850, trunk/libgomp/testsuite/libgomp.c/udr-1.c
Removed:
trunk/libgomp/testsuite/libgomp.c++/atomic-16.C
trunk/libgomp/testsuite/libgomp.c++/cancel-taskgroup-2.C
trunk/libgomp/testsuite/libgomp.c++/for-10.C
trunk/libgomp/testsuite/libgomp.c++/for-11.C
trunk/libgomp/testsuite/libgomp.c++/for-12.C
trunk/libgomp/testsuite/libgomp.c++/for-13.C
trunk/libgomp/testsuite/libgomp.c++/for-14.C
trunk/libgomp/testsuite/libgomp.c++/for-9.C
trunk/libgomp/testsuite/libgomp.c++/loop-13.C
trunk/libgomp/testsuite/libgomp.c++/loop-14.C
trunk/libgomp/testsuite/libgomp.c++/loop-15.C
trunk/libgomp/testsuite/libgomp.c++/monotonic-1.C
trunk/libgomp/testsuite/libgomp.c++/monotonic-2.C
trunk/libgomp/testsuite/libgomp.c++/nonmonotonic-1.C
trunk/libgomp/testsuite/libgomp.c++/nonmonotonic-2.C
trunk/libgomp/testsuite/libgomp.c++/ordered-1.C
trunk/libgomp/testsuite/libgomp.c++/pr45784.C
trunk/libgomp/testsuite/libgomp.c++/pr64824.C
trunk/libgomp/testsuite/libgomp.c++/pr64868.C
trunk/libgomp/testsuite/libgomp.c++/pr66199-1.C
trunk/libgomp/testsuite/libgomp.c++/pr66199-2.C
trunk/libgomp/testsuite/libgomp.c++/pr66199-3.C
trunk/libgomp/testsuite/libgomp.c++/pr66199-4.C
trunk/libgomp/testsuite/libgomp.c++/pr66199-5.C
trunk/libgomp/testsuite/libgomp.c++/pr66199-6.C
trunk/libgomp/testsuite/libgomp.c++/pr66199-7.C
trunk/libgomp/testsuite/libgomp.c++/pr66199-8.C
trunk/libgomp/testsuite/libgomp.c++/pr66199-9.C
trunk/libgomp/testsuite/libgomp.c++/pr69389.C
trunk/libgomp/testsuite/libgomp.c++/simd10.C
trunk/libgomp/testsuite/libgomp.c++/simd11.C
trunk/libgomp/testsuite/libgomp.c++/simd12.C
trunk/libgomp/testsuite/libgomp.c++/simd13.C
trunk/libgomp/testsuite/libgomp.c++/target-1.C
trunk/libgomp/testsuite/libgomp.c++/target-3.C
trunk/libgomp/testsuite/libgomp.c++/target-4.C
trunk/libgomp/testsuite/libgomp.c++/target-5.C
trunk/libgomp/testsuite/libgomp.c++/taskgroup-1.C
trunk/libgomp/testsuite/libgomp.c++/taskloop-1.C
trunk/libgomp/testsuite/libgomp.c++/taskloop-2.C
trunk/libgomp/testsuite/libgomp.c++/taskloop-3.C
trunk/libgomp/testsuite/libgomp.c++/taskloop-4.C
trunk/libgomp/testsuite/libgomp.c++/udr-9.C
trunk/libgomp/testsuite/libgomp.c/atomic-18.c
trunk/libgomp/testsuite/libgomp.c/cancel-taskgroup-2.c
trunk/libgomp/testsuite/libgomp.c/for-1.c
trunk/libgomp/testsuite/libgomp.c/for-1.h
trunk/libgomp/testsuite/libgomp.c/for-2.c
trunk/libgomp/testsuite/libgomp.c/for-2.h
trunk/libgomp/testsuite/libgomp.c/for-3.c
trunk/libgomp/testsuite/libgomp.c/for-4.c
trunk/libgomp/testsuite/libgomp.c/for-5.c
trunk/libgomp/testsuite/libgomp.c/for-6.c
trunk/libgomp/testsuite/libgomp.c/loop-13.c
trunk/libgomp/testsuite/libgomp.c/loop-14.c
trunk/libgomp/testsuite/libgomp.c/loop-15.c
trunk/libgomp/testsuite/libgomp.c/monotonic-1.c
trunk/libgomp/testsuite/libgomp.c/monotonic-2.c
trunk/libgomp/testsuite/libgomp.c/nonmonotonic-1.c
trunk/libgomp/testsuite/libgomp.c/nonmonotonic-2.c
trunk/libgomp/testsuite/libgomp.c/ordered-4.c
trunk/libgomp/testsuite/libgomp.c/pr45784.c
trunk/libgomp/testsuite/libgomp.c/pr64824.c
trunk/libgomp/testsuite/libgomp.c/pr64868.c
trunk/libgomp/testsuite/libgomp.c/pr66199-1.c
trunk/libgomp/testsuite/libgomp.c/pr66199-2.c
trunk/libgomp/testsuite/libgomp.c/pr66199-3.c
trunk/libgomp/testsuite/libgomp.c/pr66199-4.c
trunk/libgomp/testsuite/libgomp.c/pr66199-5.c
trunk/libgomp/testsuite/libgomp.c/pr66199-6.c
trunk/libgomp/testsuite/libgomp.c/pr66199-7.c
trunk/libgomp/testsuite/libgomp.c/pr66199-8.c
trunk/libgomp/testsuite/libgomp.c/pr66199-9.c
trunk/libgomp/testsuite/libgomp.c/pr69389.c
trunk/libgomp/testsuite/libgomp.c/simd-14.c
trunk/libgomp/testsuite/libgomp.c/simd-15.c
trunk/libgomp/testsuite/libgomp.c/simd-16.c
trunk/libgomp/testsuite/libgomp.c/simd-17.c
trunk/libgomp/testsuite/libgomp.c/target-1.c
trunk/libgomp/testsuite/libgomp.c/target-10.c
trunk/libgomp/testsuite/libgomp.c/target-13.c
trunk/libgomp/testsuite/libgomp.c/target-2.c
trunk/libgomp/testsuite/libgomp.c/taskgroup-1.c
trunk/libgomp/testsuite/libgomp.c/taskloop-1.c
trunk/libgomp/testsuite/libgomp.c/taskloop-2.c
trunk/libgomp/testsuite/libgomp.c/taskloop-3.c
trunk/libgomp/testsuite/libgomp.c/taskloop-4.c
trunk/libgomp/testsuite/libgomp.c/udr-1.c
Modified:
trunk/libgomp/ChangeLog
trunk/libgomp/testsuite/libgomp.c++/udr-19.C
>From gcc-bugs-return-603457-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 17:54:32 2018
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgomp/85411] [openacc] Move GOMP_OPENACC_DIM parsing out of nvptx plugin
Date: Wed, 02 May 2018 17:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85411
--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Wed May 2 17:53:56 2018
New Revision: 259852
URL: https://gcc.gnu.org/viewcvs?rev=259852&root=gcc&view=rev
Log:
[openacc] Move GOMP_OPENACC_DIM parsing out of nvptx plugin
2018-05-02 Tom de Vries <tom@codesourcery.com>
PR libgomp/85411
* plugin/plugin-nvptx.c (nvptx_exec): Move parsing of
GOMP_OPENACC_DIM ...
* env.c (parse_gomp_openacc_dim): ... here. New function.
(initialize_env): Call parse_gomp_openacc_dim.
(goacc_default_dims): Define.
* libgomp.h (goacc_default_dims): Declare.
* oacc-plugin.c (GOMP_PLUGIN_acc_default_dim): New function.
* oacc-plugin.h (GOMP_PLUGIN_acc_default_dim): Declare.
* libgomp.map: New version "GOMP_PLUGIN_1.2". Add
GOMP_PLUGIN_acc_default_dim.
* testsuite/libgomp.oacc-c-c++-common/loop-default-runtime.c: New test.
* testsuite/libgomp.oacc-c-c++-common/loop-default.h: New test.
Added:
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-default-runtime.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-default.h
Modified:
trunk/libgomp/ChangeLog
trunk/libgomp/env.c
trunk/libgomp/libgomp.h
trunk/libgomp/libgomp.map
trunk/libgomp/oacc-plugin.c
trunk/libgomp/oacc-plugin.h
trunk/libgomp/plugin/plugin-nvptx.c
>From gcc-bugs-return-603455-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 17:54:08 2018
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgomp/82428] Builtins for openacc gang/worker/vector id/size
Date: Wed, 02 May 2018 17:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82428
--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Wed May 2 17:53:29 2018
New Revision: 259850
URL: https://gcc.gnu.org/viewcvs?rev=259850&root=gcc&view=rev
Log:
[openacc] Add __builtin_goacc_parlevel_{id,size}
2018-05-02 Tom de Vries <tom@codesourcery.com>
PR libgomp/82428
* builtins.def (DEF_GOACC_BUILTIN_ONLY): Define.
* omp-builtins.def (BUILT_IN_GOACC_PARLEVEL_ID)
(BUILT_IN_GOACC_PARLEVEL_SIZE): New builtin.
* builtins.c (expand_builtin_goacc_parlevel_id_size): New function.
(expand_builtin): Call expand_builtin_goacc_parlevel_id_size.
* doc/extend.texi (Other Builtins): Add __builtin_goacc_parlevel_id and
__builtin_goacc_parlevel_size.
* f95-lang.c (DEF_GOACC_BUILTIN_ONLY): Define.
* c-c++-common/goacc/builtin-goacc-parlevel-id-size-2.c: New test.
* c-c++-common/goacc/builtin-goacc-parlevel-id-size.c: New test.
* testsuite/libgomp.oacc-c-c++-common/gang-static-2.c: Use
__builtin_goacc_parlevel_{id,size}.
* testsuite/libgomp.oacc-c-c++-common/loop-auto-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-dim-default.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-g-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-g-2.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-gwv-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-red-g-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-red-gwv-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-red-v-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-red-v-2.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-red-w-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-red-w-2.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-red-wv-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-v-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-w-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/loop-wv-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/parallel-dims.c: Same.
* testsuite/libgomp.oacc-c-c++-common/routine-g-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/routine-gwv-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/routine-v-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/routine-w-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/routine-wv-1.c: Same.
* testsuite/libgomp.oacc-c-c++-common/routine-wv-2.c: Same.
* testsuite/libgomp.oacc-c-c++-common/tile-1.c: Same.
Added:
trunk/gcc/testsuite/c-c++-common/goacc/builtin-goacc-parlevel-id-size-2.c
trunk/gcc/testsuite/c-c++-common/goacc/builtin-goacc-parlevel-id-size.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/builtins.c
trunk/gcc/builtins.def
trunk/gcc/doc/extend.texi
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/f95-lang.c
trunk/gcc/omp-builtins.def
trunk/gcc/testsuite/ChangeLog
trunk/libgomp/ChangeLog
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/gang-static-2.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-auto-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-dim-default.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-g-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-g-2.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-gwv-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-red-g-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-red-gwv-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-red-v-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-red-v-2.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-red-w-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-red-w-2.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-red-wv-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-v-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-w-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/loop-wv-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/parallel-dims.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/routine-g-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/routine-gwv-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/routine-v-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/routine-w-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/routine-wv-1.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/routine-wv-2.c
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/tile-1.c
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Subject: [Bug libgomp/85411] [openacc] Move GOMP_OPENACC_DIM parsing out of nvptx plugin
Date: Wed, 02 May 2018 17:55:00 -0000
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What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Patch with test-cases committed, marking resolved-fixed.
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Subject: [Bug testsuite/83791] Move tests to libgomp.c-c++-common
Date: Wed, 02 May 2018 17:57:00 -0000
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----------------------------------------------------------------------------
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--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
Patch modifying test-cases committed, marking resolved-fixed.
>From gcc-bugs-return-603460-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 18:01:13 2018
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Subject: [Bug libgomp/82428] Builtins for openacc gang/worker/vector id/size
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----------------------------------------------------------------------------
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--- Comment #8 from Tom de Vries <vries at gcc dot gnu.org> ---
Patch committed, marking resolved-fixed.
>From gcc-bugs-return-603461-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 18:05:10 2018
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Subject: [Bug c/82695] gnu gcc (4.8 - 7.1) cannot parse some system headers in macOS (10.12)
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--- Comment #3 from Ev Drikos <drikosev at gmail dot com> ---
gcc 8.1 on macos 10.13.4 successfully passes this test.
Thanks,
Ev. Drikos
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Subject: [Bug c++/68374] G++ -Wshadow doesn't warn about static member shadowing
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--- Comment #7 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed May 2 18:15:56 2018
New Revision: 259853
URL: https://gcc.gnu.org/viewcvs?rev=259853&root=gcc&view=rev
Log:
/cp
2018-05-02 Paolo Carlini <paolo.carlini@oracle.com>
Jason Merrill <jason@redhat.com>
PR c++/68374
* name-lookup.c (check_local_shadow): Don't handle static old
declarations in the block handling locals shadowing locals.
/testsuite
2018-05-02 Paolo Carlini <paolo.carlini@oracle.com>
Jason Merrill <jason@redhat.com>
PR c++/68374
* g++.dg/warn/Wshadow-13.C: New.
* g++.dg/warn/Wshadow-14.C: Likewise.
Added:
trunk/gcc/testsuite/g++.dg/warn/Wshadow-13.C
trunk/gcc/testsuite/g++.dg/warn/Wshadow-14.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/name-lookup.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/68374] G++ -Wshadow doesn't warn about static member shadowing
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What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fully fixed in trunk.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85615
Bug ID: 85615
Summary: ICE at -O2 and above on valid code on
x86_64-linux-gnu: in dfs_enumerate_from, at
cfganal.c:1197
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: helloqirun at gmail dot com
Target Milestone: ---
As the title.
$ 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 20180502 (experimental) [trunk revision 259838] (GCC)
$ gcc-trunk -O2 abc.c
during GIMPLE pass: vrp
abc.c: In function ‘fn1’:
abc.c:3:6: internal compiler error: in dfs_enumerate_from, at cfganal.c:1197
void fn1() {
^~~
0x5fc743 dfs_enumerate_from(basic_block_def*, int, bool (*)(basic_block_def
const*, void const*), basic_block_def**, int, void const*)
../../gcc/gcc/cfganal.c:1197
0xe97e21 determine_bb_domination_status(loop*, basic_block_def*)
../../gcc/gcc/tree-ssa-threadupdate.c:1501
0xe9a541 thread_through_loop_header
../../gcc/gcc/tree-ssa-threadupdate.c:1648
0xe9a541 thread_through_all_blocks(bool)
../../gcc/gcc/tree-ssa-threadupdate.c:2391
0xf2ddb5 execute_vrp
../../gcc/gcc/tree-vrp.c:7050
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.
$ cat abc.c
long a, d;
int b, c;
void fn1() {
int e = -1L, f = 2, g = 8;
for (;;) {
for (; b; g++)
;
int i;
for (; c;) {
i = 5;
for (; e >= 1; i--)
;
}
d = f ?: a;
if (d) {
e = 0;
for (; i;)
for (; g < 3; f++)
;
}
}
}
>From gcc-bugs-return-603465-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 18:32:24 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 tree-optimization/85615] [8/9 Regression] ICE at -O2 and above on valid code on x86_64-linux-gnu: in dfs_enumerate_from, at cfganal.c:1197
Date: Wed, 02 May 2018 18:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85615
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-02
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |8.2
Summary|ICE at -O2 and above on |[8/9 Regression] ICE at -O2
|valid code on |and above on valid code on
|x86_64-linux-gnu: in |x86_64-linux-gnu: in
|dfs_enumerate_from, at |dfs_enumerate_from, at
|cfganal.c:1197 |cfganal.c:1197
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-603466-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 18:34:39 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85615] [8/9 Regression] ICE at -O2 and above on valid code on x86_64-linux-gnu: in dfs_enumerate_from, at cfganal.c:1197
Date: Wed, 02 May 2018 18:34:00 -0000
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
r247578
>From gcc-bugs-return-603467-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 18:49:49 2018
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From: "denis_second at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85616] New: ARM target using -O2 may cause unaligned access
Date: Wed, 02 May 2018 18:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85616
Bug ID: 85616
Summary: ARM target using -O2 may cause unaligned access
Product: gcc
Version: 6.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: denis_second at hotmail dot com
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Created attachment 44052
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44052&action=edit
c file
The 32-bit arm target using "-O2" optimization option may combine single stores
into a multi store without respecting the alignment requirement of stm
instruction.
ARM reference:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka15414.html
The following output was produced using gcc version 6.3.1
simple code to recreate the issue:
extern "C" bool bugTest(unsigned char *buf_start)
{
register unsigned int item1 asm("r2") = *(unsigned int *) &buf_start[12];
register unsigned int item2 asm("r3")= *(unsigned int *) &buf_start[16];
*(unsigned int *) &buf_start[0] = item1;
*(unsigned int *) &buf_start[4] = item2;
return 1;
}
gcc -march=armv7-a -O2 -o stm.o stm.c
objdump stm.o
00000000 <bugTest>:
0: e590200c ldr r2, [r0, #12]
4: e5903010 ldr r3, [r0, #16]
8: e880000c stm r0, {r2, r3} <-- causing unaligned access if
buf_start wasn't on a word boundary
c: e12fff1e bx lr
If I turn off peephole2 optimization I get the expected assembly
gcc -march=armv7-a -O2 -fno-peephole2 -o stm.o stm.c
00000000 <bugTest>:
0: e590200c ldr r2, [r0, #12]
4: e5903010 ldr r3, [r0, #16]
8: e5802000 str r2, [r0]
c: e5803004 str r3, [r0, #4]
10: e12fff1e bx lr
>From gcc-bugs-return-603468-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 18:59:27 2018
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From: "danielgutson at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/85617] New: Wunused-but-set-variable does not analyze variables passed to functions
Date: Wed, 02 May 2018 18:59:00 -0000
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Bug ID: 85617
Summary: Wunused-but-set-variable does not analyze variables
passed to functions
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
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The following code
void f(int& x)
{
x = 1;
}
int main()
{
int a;
f(a);
//a = 1;
}
should warn about 'a' assigned but never used in main. Shouldn't be this helped
by IPA?
>From gcc-bugs-return-603469-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 19:05:44 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/68197] negative index to ios_base::iword lead to unpredictable result
Date: Wed, 02 May 2018 19:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68197
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed May 2 19:04:55 2018
New Revision: 259854
URL: https://gcc.gnu.org/viewcvs?rev=259854&root=gcc&view=rev
Log:
PR libstdc++/68197 fail on negative iword/pword indices
The suggested resolution of LWG 3083 is to make invalid indices
undefined, but we can fairly easily check for them and treat them as
errors in the same way as allocation failure. This avoids a segfault or
worse, setting an error flag on the stream instead.
PR libstdc++/68197
* include/bits/ios_base.h (ios_base::iword, ios_base::pword): Cast
indices to unsigned.
* src/c++11/ios.cc (ios_base::_M_grow_words): Treat negative indices
as failure. Refactor error handling.
* testsuite/27_io/ios_base/storage/68197.cc: New.
Added:
trunk/libstdc++-v3/testsuite/27_io/ios_base/storage/68197.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/bits/ios_base.h
trunk/libstdc++-v3/src/c++11/ios.cc
>From gcc-bugs-return-603470-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 19:07:05 2018
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Subject: [Bug libstdc++/68197] negative index to ios_base::iword lead to unpredictable result
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
GCC 9 will set badbit in the stream state on invalid indices.
>From gcc-bugs-return-603471-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 19:12:19 2018
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From: "zefzsoftwares at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85618] New: Zero initialized non constant stack array causes internal compile error
Date: Wed, 02 May 2018 19:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85618
Bug ID: 85618
Summary: Zero initialized non constant stack array causes
internal compile error
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: zefzsoftwares at hotmail dot com
Target Milestone: ---
Following code to reproduce compile error:
void function(int size) {
bool myArray[size][size] = {};
}
Compilation example: https://godbolt.org/g/VfDvsr
Fails with the following error:
"
during RTL pass: expand
<source>: In function 'void function(std::vector<int>)':
<source>:4:9: internal compiler error: in make_decl_rtl, at varasm.c:1322
bool myArray[arg.size()][arg.size()] = {};
^~~~~~~
mmap: Invalid argument
"
Removing the = {} initializer and using a memset() instead is a work-around.
Regression bug since it compiles fine with GCC 7
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From: "julien at trigofacile dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/85619] New: Inconsistent descriptions for new warning options in GCC 8.1.0
Date: Wed, 02 May 2018 20:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85619
Bug ID: 85619
Summary: Inconsistent descriptions for new warning options in
GCC 8.1.0
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
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In GCC 8.1.0 documentation
(https://gcc.gnu.org/onlinedocs/gcc-8.1.0/gcc/Warning-Options.html):
1/ -Wif-not-aligned is said to be included by default in documentation, but
Release Changes mention its inclusion in -Wall. So, is it really the case?
(Also note a typo "This is is enabled by default." in documentation.)
2/ -Wstringop-truncation and -Wpacked-not-aligned are said to be included in
-Wall in Release Changes but documentation does not mention them in -Wall.
>From gcc-bugs-return-603473-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 20:31:18 2018
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Subject: [Bug ipa/85617] Wunused-but-set-variable does not analyze variables passed to functions
Date: Wed, 02 May 2018 20:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85617
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I doubt we want to make this warning to be flow sensitive at all. There are
many other warnings which are flow sensitive and they change behavior between
different releases of GCC and implementing this warning this way will do just
that too.
>From gcc-bugs-return-603474-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 20:35:06 2018
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From: "danielgutson at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/85617] Wunused-but-set-variable does not analyze variables passed to functions
Date: Wed, 02 May 2018 20:35:00 -0000
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--- Comment #2 from Daniel Gutson <danielgutson at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> I doubt we want to make this warning to be flow sensitive at all. There are
> many other warnings which are flow sensitive and they change behavior
> between different releases of GCC and implementing this warning this way
> will do just that too.
Sorry I don't get the issue. Are you saying that similar features suffered
breakage between releases , and because of that, this feature should not be
implemented because it may suffer the same fate?
>From gcc-bugs-return-603475-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 20:37:14 2018
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Subject: [Bug middle-end/85620] New: getcontext is wrongly marked return twice
Date: Wed, 02 May 2018 20:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85620
Bug ID: 85620
Summary: getcontext is wrongly marked return twice
Product: gcc
Version: 8.0
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special_function_p has
/* ECF_RETURNS_TWICE is safe even for -ffreestanding. */
if (! strcmp (tname, "setjmp")
|| ! strcmp (tname, "sigsetjmp")
|| ! strcmp (name, "savectx")
|| ! strcmp (name, "vfork")
|| ! strcmp (name, "getcontext"))
^^^^^^^^^^^^ getcontext never returns twice.
Instead swapcontext may return twice.
flags |= ECF_RETURNS_TWICE;
>From gcc-bugs-return-603476-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 20:42:42 2018
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Subject: [Bug middle-end/85620] getcontext is wrongly marked return twice
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
getcontext does return twice. Swapcontext only returns once.
If you get the current context, and then latter on swap the context, you just
returned to the place where getcontext is called. you do setcontext (or
swapcontext again), you get the swapcontext context. That is it only ever
returns once.
>From gcc-bugs-return-603477-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 20:44:09 2018
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Subject: [Bug middle-end/85620] getcontext is wrongly marked return twice
Date: Wed, 02 May 2018 20:44:00 -0000
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
http://pubs.opengroup.org/onlinepubs/007904975/functions/getcontext.html
If the ucp argument was created with getcontext(), program execution continues
as if the corresponding call of getcontext() had just returned.
That means it does return twice.
>From gcc-bugs-return-603478-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 20:47:53 2018
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Subject: [Bug middle-end/85620] getcontext is wrongly marked return twice
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H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
Technically, swapcontext only returns once, but not when it is called.
In that sense, it returns twice.
>From gcc-bugs-return-603479-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 20:52:51 2018
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From: "anlauf at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85579] [9 regression] SIGSEV in fortran test case gfortran.dg/pr51434.f90 starting with r259754
Date: Wed, 02 May 2018 20:52:00 -0000
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Harald Anlauf <anlauf at gmx dot de> changed:
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----------------------------------------------------------------------------
CC| |anlauf at gmx dot de
--- Comment #6 from Harald Anlauf <anlauf at gmx dot de> ---
(In reply to Richard Biener from comment #5)
> FE issue I believe.
It looks like the testcase got corrupted.
Testing with another compiler shows that it is invalid as is. E.g.,
% nagfor pr51434.f90
NAG Fortran Compiler Release 6.1(Tozai) Build 6106
Error: pr51434.f90, line 9: Dimension 1 of value for array T has extent 18
instead of 5
Errors in declarations, no further processing for FOO
Error: pr51434.f90, line 13: USE of module FOO which has errors
Errors in declarations, no further processing for BAR
[NAG Fortran Compiler error termination, 2 errors]
Replacing the line
character(len=1):: t(n) = transfer('abcde ', s)
by
character(len=1):: t(n) = transfer('abcde', s)
makes it work properly.
>From gcc-bugs-return-603480-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 21:02:36 2018
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Subject: [Bug middle-end/85620] swapcontext isn't marked return twice
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--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #3)
> Technically, swapcontext only returns once, but not when it is called.
> In that sense, it returns twice.
Huh? For the purpose of ECF_RETURNS_TWICE, swapcontext does not need to be
marked as such. ECF_RETURNS_TWICE is only needed for CFG reasons.
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/85607] [9 Regression] ice in add_type, at ipa-icf.c:1583
Date: Wed, 02 May 2018 21:03:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
Summary|ice in add_type, at |[9 Regression] ice in
|ipa-icf.c:1583 |add_type, at ipa-icf.c:1583
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Subject: [Bug target/85613] [8/9 regression] FAIL: gfortran.dg/pr51434.f90 -O1 execution test
Date: Wed, 02 May 2018 21:10:00 -0000
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Andreas Schwab <schwab@linux-m68k.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
.
*** This bug has been marked as a duplicate of bug 85579 ***
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Subject: [Bug fortran/85579] [9 regression] SIGSEV in fortran test case gfortran.dg/pr51434.f90 starting with r259754
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Andreas Schwab <schwab@linux-m68k.org> changed:
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CC| |schwab@linux-m68k.org
--- Comment #7 from Andreas Schwab <schwab@linux-m68k.org> ---
*** Bug 85613 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603484-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 21:31:40 2018
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From: "slyfox at inbox dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgcc/85621] New: savms/resms have executable stack (lack GNU-stack marking)
Date: Wed, 02 May 2018 21:31:00 -0000
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Bug ID: 85621
Summary: savms/resms have executable stack (lack GNU-stack
marking)
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgcc
Assignee: unassigned at gcc dot gnu.org
Reporter: slyfox at inbox dot ru
Target Milestone: ---
Detected by gentoo's scanelf when building gcc-8.0.1:
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/32/libgcc.a:avx_savms64.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/32/libgcc.a:avx_resms64.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/32/libgcc.a:avx_resms64x.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/32/libgcc.a:avx_savms64f.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/32/libgcc.a:avx_resms64f.o
* !WX --- ---
usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/32/libgcc.a:avx_resms64fx.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/32/libgcc.a:sse_savms64.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/32/libgcc.a:sse_resms64.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/32/libgcc.a:sse_resms64x.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/32/libgcc.a:sse_savms64f.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/32/libgcc.a:sse_resms64f.o
* !WX --- ---
usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/32/libgcc.a:sse_resms64fx.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/libgcc.a:avx_savms64.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/libgcc.a:avx_resms64.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/libgcc.a:avx_resms64x.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/libgcc.a:avx_savms64f.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/libgcc.a:avx_resms64f.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/libgcc.a:avx_resms64fx.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/libgcc.a:sse_savms64.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/libgcc.a:sse_resms64.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/libgcc.a:sse_resms64x.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/libgcc.a:sse_savms64f.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/libgcc.a:sse_resms64f.o
* !WX --- --- usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/libgcc.a:sse_resms64fx.o
My guess is that libgcc/config/i386 files:
resms64.h resms64f.h resms64fx.h resms64x.h savms64.h savms64f.h
require something like:
#if defined(__ELF__) && defined(__linux__)
.section .note.GNU-stack,"",%progbits
.previous
#endif
Thanks!
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Subject: [Bug libgcc/85621] savms/resms have executable stack (lack GNU-stack marking)
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--- Comment #1 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Created attachment 44053
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44053&action=edit
0001-i386-savms-resms-mark-stack-non-executable-PR85621.patch
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From: "haberg-1 at telia dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/85472] Regex match bug
Date: Wed, 02 May 2018 21:48:00 -0000
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--- Comment #22 from Hans Ã…berg <haberg-1 at telia dot com> ---
(In reply to Tim Shen from comment #16)
> ...I meant to observe whether the example triggers a O(k^2) behavior. It
> should be less than quadratic. ...
> Here is the updated example, to re-arrange the expression to a tree, not a
> chain of "|" operators.
The matching itself that I do is linear O(k): I used a version of your example
for my program, timing the part in question for various values, dividing with N
and N^2, where N is the difference of the input numbers, making it easy to see
if it is O(k) or O(k^2).
However, in your example, the DFA lexing is quadratic, probably because I use
unordered_set objects that here gets size proportional to N. Thus this ought to
be optimized. So you might check if that might be an issue in the C++ library.
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Subject: [Bug target/85582] [9 Regression] wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed May 2 21:56:17 2018
New Revision: 259862
URL: https://gcc.gnu.org/viewcvs?rev=259862&root=gcc&view=rev
Log:
PR target/85582
* config/i386/i386.md (*ashl<dwi>3_doubleword_mask,
*ashl<dwi>3_doubleword_mask_1, *<shift_insn><dwi>3_doubleword_mask,
*<shift_insn><dwi>3_doubleword_mask_1): In condition require that
the highest significant bit of the shift count mask is clear. In
check whether and[sq]i3 is needed verify that all significant bits
of the shift count other than the highest are set.
* gcc.c-torture/execute/pr85582-3.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/execute/pr85582-3.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.md
trunk/gcc/testsuite/ChangeLog
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85582] [9 Regression] wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode
Date: Wed, 02 May 2018 21:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85582
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-603489-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 22:31:05 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 middle-end/85620] Missing ENDBR after swapcontext
Date: Wed, 02 May 2018 22:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85620
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-02
CC| |igor.v.tsimbalist at intel dot com
Blocks| |81652
Summary|swapcontext isn't marked |Missing ENDBR after
|return twice |swapcontext
Ever confirmed|0 |1
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
[hjl@gnu-skx-1 ucontext-1]$ cat y.i
struct ucontext;
typedef struct ucontext ucontext_t;
extern int swapcontext (ucontext_t *__restrict __oucp,
const ucontext_t *__restrict __ucp);
extern int res;
void
foo (ucontext_t *oucp, ucontext_t *ucp)
{
res = swapcontext (oucp, ucp);
}
[hjl@gnu-skx-1 ucontext-1]$ make y.s
/export/build/gnu/gcc-8-test/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc-8-test/build-x86_64-linux/gcc/ -O2 -fcf-protection -S
y.i
[hjl@gnu-skx-1 ucontext-1]$ cat y.s
.file "y.i"
.text
.p2align 4,,15
.globl foo
.type foo, @function
foo:
.LFB0:
.cfi_startproc
endbr64
subq $8, %rsp
.cfi_def_cfa_offset 16
call swapcontext <<<<<<< This may return via indirect branch.
<<<<<<<<<<< Need ENDBR here.
movl %eax, res(%rip)
addq $8, %rsp
.cfi_def_cfa_offset 8
ret
.cfi_endproc
.LFE0:
.size foo, .-foo
.ident "GCC: (GNU) 8.1.1 20180502"
.section .note.GNU-stack,"",@progbits
.section .note.gnu.property,"a"
.align 8
.long 1f - 0f
.long 4f - 1f
.long 5
0:
.string "GNU"
1:
.align 8
.long 0xc0000002
.long 3f - 2f
2:
.long 0x3
3:
.align 8
4:
[hjl@gnu-skx-1 ucontext-1]$
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
[Bug 81652] [meta-bug] -fcf-protection=full bugs
>From gcc-bugs-return-603490-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 22:35:19 2018
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Subject: [Bug libgcc/85621] savms/resms have executable stack (lack GNU-stack marking)
Date: Wed, 02 May 2018 22:35:00 -0000
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Sergei Trofimovich <slyfox at inbox dot ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at redhat dot com,
| |zorry at gentoo dot org
--- Comment #2 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Magnus posted very similar patch:
https://gcc.gnu.org/ml/gcc-patches/2018-05/msg00011.html
>From gcc-bugs-return-603491-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 23:23:40 2018
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From: "daniel.santos at pobox dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgcc/85621] savms/resms have executable stack (lack GNU-stack marking)
Date: Wed, 02 May 2018 23:23:00 -0000
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Daniel Santos <daniel.santos at pobox dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |daniel.santos at pobox dot com
--- Comment #3 from Daniel Santos <daniel.santos at pobox dot com> ---
Hello guys.
These save/restore stubs are for 64-bit Wine and I don't know of anything else
that will use them.
I'm having a bit of trouble finding documentation on this section, but I did
find a thread suggesting that it should be documented
(https://sourceware.org/ml/gnu-gabi/2016-q1/msg00001.html :) I guess I need to
dig into binutils sources for info? What exactly does adding this section do?
Thanks
>From gcc-bugs-return-603492-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 23:47:30 2018
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Subject: [Bug c++/60277] Bogus "inline function virtual ..." used but never defined
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-02
Ever confirmed|0 |1
>From gcc-bugs-return-603493-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 23:50:12 2018
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Subject: [Bug c++/59655] incorrect diagnostic on templatized function with lambda parameter
Date: Wed, 02 May 2018 23:50:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Last reconfirmed|2017-10-01 00:00:00 |2018-5-3
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=80916
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
A smaller testcase:
template<typename T> struct trait { static constexpr bool value = false; };
struct thread {
template<typename T, typename... U>
thread(T t)
{
static_assert(trait<T>::value, "trait");
foo(t);
}
template<typename T> void foo(T) { return; }
};
int main()
{
thread t([](int) { });
}
used.cc: In instantiation of 'thread::thread(T) [with T =
main()::<lambda(int)>; U = {}]':
used.cc:17:23: required from here
used.cc:7:21: error: static assertion failed: trait
static_assert(trait<T>::value, "trait");
^~~~~~~~
used.cc:12:29: error: 'void thread::foo(T) [with T = main()::<lambda(int)>]',
declared using local type 'main()::<lambda(int)>', is used but never defined
[-fpermissive]
template<typename T> void foo(T) { return; }
^~~
used.cc:12:29: warning: 'void thread::foo(T) [with T = main()::<lambda(int)>]'
used but never defined
>From gcc-bugs-return-603494-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed May 02 23:55:42 2018
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From: "hp at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/85622] New: gcc-8.1.0/NEWS says it's not released yet
Date: Wed, 02 May 2018 23:55:00 -0000
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Bug ID: 85622
Summary: gcc-8.1.0/NEWS says it's not released yet
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Target Milestone: ---
In the gcc-8.1.0 tarball, the file NEWS contains, near the top:
"As of this time no releases of GCC 8 have yet been made."
further down:
"Disclaimer: GCC 8 has not been released yet, so this document is a
work-in-progress."
The NEWS file says it's autogenerated and those two lines come from paragraphs
that indicate that they're generated from <http://gcc.gnu.org/gcc-8/index.html>
and <http://gcc.gnu.org/gcc-8/changes.html> respectively.
Not sure how to fix that accurately, but perhaps by adjusting the
release-checklist (wherever that lives) so "update the index.html and
gcc-N/changes.html web pages" come before "execute the release script"?
>From gcc-bugs-return-603495-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 03:13:18 2018
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From: "gandalf at winds dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85623] New: strncmp() warns about attribute 'nonstring' incorrectly in -Wstringop-overflow
Date: Thu, 03 May 2018 03:13:00 -0000
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Bug ID: 85623
Summary: strncmp() warns about attribute 'nonstring'
incorrectly in -Wstringop-overflow
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
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The following code emits a warning when using strncmp() to compare a small
quoted string with a "char data[4]" array declared __attribute__((nonstring)).
The warning only appears if the quoted string is smaller than the size of the
data[] array. My use of the data[] array is intended to act like a
NUL-terminated string unless it is 4 bytes long, at which point it is
non-NUL-terminated. This is the expected behavior when using strncpy() to fill
(and truncate) arbitrary strings into a fixed-sized char[] array. I understand
I can let GCC know of this intent by marking the array with
__attribute__((nonstring)).
My anticipated fix for GCC is that this warning should only appear with
strcmp() and not strncmp().
extern char *strncpy (char *, const char *, long);
extern int strncmp (const char *, const char *, long);
extern __attribute__((nonstring)) char data[4];
void test(char *string)
{
if(strncmp(data, "??", sizeof(data)))
strncpy(data, string, sizeof(data));
}
# gcc -O3 test.c -c -Wall
test.c: In function ‘test’:
test.c:8:6: warning: ‘__builtin_strcmp’ argument 1 declared attribute
‘nonstring’ [-Wstringop-overflow=]
if(strncmp(data, "??", sizeof(data)))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test.c:4:40: note: argument ‘data’ declared here
Incidentally, changing the "??" to "????" or to a variable of type char* does
not cause the warning.
In my understanding, strncmp() is the correct function to use here because the
size (3rd arg) does not overflow the length of data[4]. Nothing has overflowed
here to warrant a stringop-overflow warning.
I'm also unsure why the warning says '__builtin_strcmp' when strncmp() instead
of strcmp() is being used.
Removing the __attribute__((nonstring)) causes strncpy() to warn instead:
extern char *strncpy (char *, const char *, long);
extern int strncmp (const char *, const char *, long);
extern char data[4];
void test(char *string)
{
if(strncmp(data, "??", sizeof(data)))
strncpy(data, string, sizeof(data));
}
# gcc -O3 test.c -c -Wall
test.c: In function ‘test’:
test.c:9:5: warning: ‘strncpy’ specified bound 4 equals destination size
[-Wstringop-truncation]
strncpy(data, string, sizeof(data));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Conclusion: If GCC 8+ intends that we mark non-NUL-terminated strings with
__attribute__((nonstring)) going forward, then there needs to be a way to
cleanly use strncmp() to compare strings saved with strncpy() without any
warnings.
>From gcc-bugs-return-603496-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 03:31:35 2018
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Subject: [Bug c++/81976] bad is_standard_layout/has_unique_object_representations results with a chain of empty bases
Date: Thu, 03 May 2018 03:31:00 -0000
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--- Comment #4 from Pádraig Brady <P at draigBrady dot com> ---
According to the previous comment this depends on PR 82764
and the target milestone is 7.4
>From gcc-bugs-return-603497-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 06:11:05 2018
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/63371] kind() with function name (not call) as argument
Date: Thu, 03 May 2018 06:11:00 -0000
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Jürgen Reuter <juergen.reuter at desy dot de> changed:
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----------------------------------------------------------------------------
CC| |dominiq at lps dot ens.fr,
| |janus at gcc dot gnu.org
--- Comment #4 from Jürgen Reuter <juergen.reuter at desy dot de> ---
This code is now rejected with an error message:
foo.f90:8:19:
PRINT *, KIND(f)
1
Error: 'x' argument of 'kind' intrinsic at (1) must be a data entity
as was done in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63363
So I think it was just forgotten to close this issue!?
>From gcc-bugs-return-603499-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 06:52:56 2018
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Subject: [Bug fortran/63363] No diagnostic for passing function as actual argument to KIND
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
CC| |burnus at gcc dot gnu.org
--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
*** Bug 63371 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603498-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 06:52:56 2018
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Subject: [Bug fortran/63371] kind() with function name (not call) as argument
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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----------------------------------------------------------------------------
Status|NEW |RESOLVED
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--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Duplicate.
*** This bug has been marked as a duplicate of bug 63363 ***
>From gcc-bugs-return-603501-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 07:16:04 2018
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Subject: [Bug c++/82764] [7/8 Regression] ICE in output_constructor_regular_field, at varasm.c:5030
Date: Thu, 03 May 2018 07:16:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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CC| |oremanj at mit dot edu
--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 81976 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603500-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 07:16:02 2018
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Subject: [Bug c++/81976] bad is_standard_layout/has_unique_object_representations results with a chain of empty bases
Date: Thu, 03 May 2018 07:16:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Let's call it a dup of PR 82764 then.
*** This bug has been marked as a duplicate of bug 82764 ***
>From gcc-bugs-return-603502-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 07:22:18 2018
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From: "saaadhu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85624] New: ICE when initializing array that is 128-byte aligned
Date: Thu, 03 May 2018 07:22:00 -0000
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Bug ID: 85624
Summary: ICE when initializing array that is 128-byte aligned
Product: gcc
Version: unknown
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Priority: P3
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Target Milestone: ---
avr-gcc 9.0.0 20180502 (and older versions) crashes with an ICE for the
following piece of code
void foo() {
volatile int arr[3] __attribute__((aligned(128))) = {0};
return arr[2];
}
Compiled with -O3 -mmcu=avr5, the compiler outputs
In function 'foo':
5 : warning: 'return' with a value, in function returning void
return arr[2];
~~~^~~
3 : note: declared here
void foo() {
^~~
6 : error: unrecognizable insn:
}
^
(insn 13 12 14 2 (parallel [
(set (mem:BLK (reg:HI 49) [0 A8])
(const_int 0 [0]))
(use (reg:QI 48))
(use (const_int 128 [0x80]))
(clobber (scratch:HI))
(clobber (scratch:QI))
]) "/tmp/gcc-explorer-compiler11843-10755-1jj9whv.s66yh3q5mi/example.c":4 -1
(nil))
during RTL pass: vregs
6 : internal compiler error: in extract_insn, at recog.c:2304
0x5a8f99 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
../../gcc-src/gcc/rtl-error.c:108
0x5a8fb8 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
../../gcc-src/gcc/rtl-error.c:116
0xb1394b extract_insn(rtx_insn*)
../../gcc-src/gcc/recog.c:2304
0x8b7873 instantiate_virtual_regs_in_insn
../../gcc-src/gcc/function.c:1599
0x8b7873 instantiate_virtual_regs
../../gcc-src/gcc/function.c:1969
0x8b7873 execute
../../gcc-src/gcc/function.c:2018
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.
Compiler exited with result code 1
>From gcc-bugs-return-603503-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 07:33:46 2018
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Subject: [Bug fortran/85579] [9 regression] SIGSEV in fortran test case gfortran.dg/pr51434.f90 starting with r259754
Date: Thu, 03 May 2018 07:33:00 -0000
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu May 3 07:33:09 2018
New Revision: 259880
URL: https://gcc.gnu.org/viewcvs?rev=259880&root=gcc&view=rev
Log:
2018-05-03 Richard Biener <rguenther@suse.de>
PR testsuite/85579
* fortran.dg/pr51434.f90: Truncate transfer argument.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/pr51434.f90
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85579] accepts invalid fortran test case gfortran.dg/pr51434.f90
Date: Thu, 03 May 2018 07:34:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid
Target Milestone|9.0 |---
Summary|[9 regression] SIGSEV in |accepts invalid fortran
|fortran test case |test case
|gfortran.dg/pr51434.f90 |gfortran.dg/pr51434.f90
|starting with r259754 |
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/85617] Wunused-but-set-variable does not analyze variables passed to functions
Date: Thu, 03 May 2018 07:34:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |jakub at gcc dot gnu.org
Resolution|--- |WONTFIX
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The warning really can't be implemented later than in the FE, because many of
the non-setting uses are optimized away already during the FEs. So there is no
way this can be handled as requested.
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Subject: [Bug target/85610] Unable to optimize away mov followed by compare into a cmpb in case of atomic_load
Date: Thu, 03 May 2018 07:44:00 -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 |NEW
Last reconfirmed| |2018-05-03
Component|tree-optimization |target
Version|tree-ssa |7.3.1
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. RTL expansion looks ok so it looks like a combine/backend issue.
;; _5 = __atomic_load_1 (&MEM[(const struct __atomic_base *)&flag_atomic]._M_i,
0);
(insn 5 4 0 (set (reg:QI 87 [ _5 ])
(mem/v:QI (symbol_ref:DI ("flag_atomic") [flags 0x2] <var_decl
0x7ffff665d360 flag_atomic>) [-1 S1 A8]))
"/usr/include/c++/7/bits/atomic_base.h":396 -1
(nil))
;; if (_5 == 0)
(insn 6 5 7 (set (reg:CCZ 17 flags)
(compare:CCZ (reg:QI 87 [ _5 ])
(const_int 0 [0]))) "t.C":9 -1
(nil))
(jump_insn 7 6 0 (set (pc)
(if_then_else (ne (reg:CCZ 17 flags)
(const_int 0 [0]))
(label_ref 0)
(pc))) "t.C":9 -1
(int_list:REG_BR_PROB 5400 (nil)))
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Subject: [Bug tree-optimization/85611] Suboptimal code generation for (potentially) redundant atomic loads
Date: Thu, 03 May 2018 07:49:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-05-03
Version|tree-ssa |7.3.1
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
So what do you expect? Elide the 2nd atomic load? We currently make no
attempt at "optimizing" atomics on GIMPLE. OTOH run2 shows we do sth on RTL -
ah, no.
The testcase is just incomplete enough that the control statement is dead and
the load is removed during RTL optimization.
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Subject: [Bug tree-optimization/85615] [8/9 Regression] ICE at -O2 and above on valid code on x86_64-linux-gnu: in dfs_enumerate_from, at cfganal.c:1197
Date: Thu, 03 May 2018 07:50:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|NEW |ASSIGNED
Version|unknown |8.1.1
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.
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Subject: [Bug target/85616] ARM target using -O2 may cause unaligned access
Date: Thu, 03 May 2018 07:51:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |arm
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think this was fixed at some point so there should be a duplicate.
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Subject: [Bug c++/85618] [8/9 Regression] Zero initialized non constant stack array causes internal compile error
Date: Thu, 03 May 2018 07:52:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Known to work| |7.3.1
Keywords| |ice-on-valid-code,
| |needs-bisection
Last reconfirmed| |2018-05-03
Ever confirmed|0 |1
Summary|Zero initialized non |[8/9 Regression] Zero
|constant stack array causes |initialized non constant
|internal compile error |stack array causes internal
| |compile error
Target Milestone|--- |8.2
Known to fail| |8.1.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug other/85622] gcc-8.1.0/NEWS says it's not released yet
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
It already says that... we're just lazy from time to time. Making gcc_release
double-check and fail might be an option ;)
This bug by itself isn't fixable, so WONTFIX...
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Subject: [Bug libgcc/85621] savms/resms have executable stack (lack GNU-stack marking)
Date: Thu, 03 May 2018 08:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85621
Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Target| |x86_64-*-*, i?86-*-*
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-03
Ever confirmed|0 |1
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-603513-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 08:12:48 2018
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From: "Bader at lrz dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85625] New: Intenal Compiler Error for coindexed assignment
Date: Thu, 03 May 2018 08:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85625
Bug ID: 85625
Summary: Intenal Compiler Error for coindexed assignment
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: Bader at lrz dot de
Target Milestone: ---
Created attachment 44054
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44054&action=edit
reproducer for described problem
The attached Fortran file produces an ICE when built with
gfortran -fcoarray=lib dummycoarray_04_pos.f90
The error message that is issued is:
dummycoarray_04_pos.f90:11:0:
x[i] = x
internal compiler error: in gfc_dep_resolver, at fortran/dependency.c:2258
0x6f7d66 gfc_dep_resolver(gfc_ref*, gfc_ref*, gfc_reverse*)
../../gcc/fortran/dependency.c:2258
0x748bc5 conv_caf_send
../../gcc/fortran/trans-intrinsic.c:1863
0x74f085 gfc_conv_intrinsic_subroutine(gfc_code*)
../../gcc/fortran/trans-intrinsic.c:10981
0x701e52 trans_code
../../gcc/fortran/trans.c:1887
0x7653d3 gfc_trans_if_1
../../gcc/fortran/trans-stmt.c:1433
0x76d78a gfc_trans_if(gfc_code*)
../../gcc/fortran/trans-stmt.c:1464
0x701db7 trans_code
../../gcc/fortran/trans.c:1916
0x72812b gfc_generate_function_code(gfc_namespace*)
../../gcc/fortran/trans-decl.c:6507
0x7056d9 gfc_generate_module_code(gfc_namespace*)
../../gcc/fortran/trans.c:2222
0x6b8dab translate_all_program_units
../../gcc/fortran/parse.c:6108
0x6b8dab gfc_parse_file()
../../gcc/fortran/parse.c:6324
0x6ff14f gfc_be_parse_file
../../gcc/fortran/f95-lang.c:204
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.
Replacing the RHS by an auxiliary variable that holds a copy of x does not
trigger the error. However, since significant changes to existing codes may be
required, I think this is a quite serious regression and should be fixed soon.
>From gcc-bugs-return-603514-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 08:19:02 2018
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From: "ryxi at stu dot xidian.edu.cn" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/48200] linking shared library with LTO results in different exported symbols
Date: Thu, 03 May 2018 08:19:00 -0000
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Xi Ruoyao <ryxi at stu dot xidian.edu.cn> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ryxi at stu dot xidian.edu.cn
--- Comment #12 from Xi Ruoyao <ryxi at stu dot xidian.edu.cn> ---
This issue makes the shared libraries (libstdc++.so etc.) unusable if GCC is
bootstrapped with C{XX,}FLAGS_FOR_TARGET="-flto -O3".
>From gcc-bugs-return-603515-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 08:20:28 2018
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From: "Bader at lrz dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85625] Internal Compiler Error for coindexed assignment
Date: Thu, 03 May 2018 08:20:00 -0000
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Bader at lrz dot de <Bader at lrz dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
Summary|Intenal Compiler Error for |Internal Compiler Error for
|coindexed assignment |coindexed assignment
--- Comment #1 from Bader at lrz dot de <Bader at lrz dot de> ---
I just noted that 85507 deals with the same issue. Sorry for the duplicate.
*** This bug has been marked as a duplicate of bug 85507 ***
>From gcc-bugs-return-603516-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 08:20:28 2018
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Subject: [Bug fortran/85507] [6/7/8/9 Regression] ICE in gfc_dep_resolver, at fortran/dependency.c:2258
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Bader at lrz dot de <Bader at lrz dot de> changed:
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CC| |Bader at lrz dot de
--- Comment #15 from Bader at lrz dot de <Bader at lrz dot de> ---
*** Bug 85625 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603517-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 08:26:04 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 lto/48200] linking shared library with LTO results in different exported symbols
Date: Thu, 03 May 2018 08:26:00 -0000
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--- Comment #13 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Concerning comment #11, if you have toplevel asms you need to disable LTO for
that unit, as there is no way to tell for gcc what the asm statement is doing.
Perhaps attribute would be better way to do this?
What is status of this bug in general? I must admit I thought we have issues
long solved here :(
>From gcc-bugs-return-603518-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 08:46:20 2018
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Subject: [Bug target/85616] ARM target using -O2 may cause unaligned access
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ktkachov at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-03
CC| |ktkachov at gcc dot gnu.org
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--- Comment #2 from ktkachov at gcc dot gnu.org ---
Trunk still generates the stm instruction.
>From gcc-bugs-return-603519-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 08:53:46 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 tree-optimization/85615] [8/9 Regression] ICE at -O2 and above on valid code on x86_64-linux-gnu: in dfs_enumerate_from, at cfganal.c:1197
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |law at gcc dot gnu.org
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
It looks like loop structure is already broken to the extent that
loop->num_nodes
cannot be trusted and thus
bblocks = XCNEWVEC (basic_block, loop->num_nodes);
dbds_ce_stop = loop->header;
nblocks = dfs_enumerate_from (loop->latch, 1, dbds_continue_enumeration_p,
bblocks, loop->num_nodes, bb);
breaks (not enough space in bblocks, thus bb is not reachable from
loop->latch).
In fact loop structure looks totally broken to me :/
We seem to thread through always true/false conditions that are left over from
VRP substitute-and-fold which relies on CFG cleanup to cleanup things here.
When we thread through block 12,
Breakpoint 5, thread_block_1 (bb=<basic_block 0x7ffff689f750 (12)>,
noloop_only=true, joiners=false)
we have threaded through the loop header which in the end wrecks things.
We do not hit
/* One case occurs when there was loop header buried in a jump
threading path that crosses loop boundaries. We do not try
and thread this elsewhere, so just cancel the jump threading
request by clearing the AUX field now. */
if (bb->loop_father != e2->src->loop_father
&& !loop_exit_edge_p (e2->src->loop_father, e2))
{
nor
/* Another case occurs when trying to thread through our
own loop header, possibly from inside the loop. We will
thread these later. */
unsigned int i;
for (i = 1; i < path->length (); i++)
{
but the case involves a very long path (6 edges) where we thread through
the header of an outer loop into an inner loop and finally through the
exit of the inner loop. I guess we should hit the first case by allowing
the exit threading only if the exit is to bb->loop_father. Otherwise
we create an alternate entry (which is what happens here). Like by
making the check consisted with the others.
I'm testing the following.
Index: gcc/tree-ssa-threadupdate.c
===================================================================
--- gcc/tree-ssa-threadupdate.c (revision 259879)
+++ gcc/tree-ssa-threadupdate.c (working copy)
@@ -1309,7 +1309,7 @@ thread_block_1 (basic_block bb, bool nol
and thread this elsewhere, so just cancel the jump threading
request by clearing the AUX field now. */
if (bb->loop_father != e2->src->loop_father
- && !loop_exit_edge_p (e2->src->loop_father, e2))
+ && !loop_exit_edge_p (bb->loop_father, e2))
{
/* Since this case is not handled by our special code
to thread through a loop header, we must explicitly
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Subject: [Bug tree-optimization/85588] [6/7/8/9 Regression] -fwrapv miscompilation
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
A fix is probably as simple as
Index: gcc/fold-const.c
===================================================================
--- gcc/fold-const.c (revision 259879)
+++ gcc/fold-const.c (working copy)
@@ -472,7 +472,7 @@ negate_expr_p (tree t)
case TRUNC_DIV_EXPR:
case ROUND_DIV_EXPR:
case EXACT_DIV_EXPR:
- if (TYPE_UNSIGNED (type))
+ if (TYPE_OVERFLOW_WRAPS (type))
break;
if (negate_expr_p (TREE_OPERAND (t, 0)))
return true;
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Subject: [Bug fortran/85603] ICE with character array substring assignment
Date: Thu, 03 May 2018 09:34:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-03
Blocks| |68241
Ever confirmed|0 |1
--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Confirmed from at least 4.8 up to trunk (9.0).
I am pretty sure this is a duplicate.
The code compiles if I replace
strings = strings(:)(:maxlen)
with
strings(1) = strings(1)(:maxlen)
strings(2) = strings(2)(:maxlen)
but this does not set the length of 'strings' to 'maxlen'.
IIRC I have recently seen a post saying that substrings of string array
sections are forbidden by the standard.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68241
[Bug 68241] [meta-bug] [F03] Deferred-length character
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Subject: [Bug other/85622] gcc-8.1.0/NEWS says it's not released yet
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu May 3 09:29:39 2018
New Revision: 259881
URL: https://gcc.gnu.org/viewcvs?rev=259881&root=gcc&view=rev
Log:
PR other/85622
* gcc_release: For -f, verify contrib/gennews has the major version
pages listed and both index.html and changes.html have been updated
for the new release.
Modified:
trunk/maintainer-scripts/ChangeLog
trunk/maintainer-scripts/gcc_release
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Subject: [Bug lto/48200] linking shared library with LTO results in different exported symbols
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--- Comment #14 from Xi Ruoyao <ryxi at stu dot xidian.edu.cn> ---
(In reply to Jan Hubicka from comment #13)
> What is status of this bug in general? I must admit I thought we have issues
> long solved here :(
It still exists in 8.1. Libstdc++ uses top level asm statement for symbol
versioning. Then symbol std::istream::ignore(long)@GLIBCXX_3_4 just
disappears, and libstdc++.so can't be used (this symbol becomes *UND*).
>From gcc-bugs-return-603524-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 09:41:37 2018
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Subject: [Bug other/85622] gcc-8.1.0/NEWS says it's not released yet
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The added checks should make sure we don't forget to do it early next time.
We can't really fix the 8.1 tarballs now of course.
>From gcc-bugs-return-603525-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 09:50:55 2018
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Subject: [Bug lto/48200] linking shared library with LTO results in different exported symbols
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--- Comment #15 from Xi Ruoyao <ryxi at stu dot xidian.edu.cn> ---
(In reply to Jan Hubicka from comment #13)
> Concerning comment #11, if you have toplevel asms you need to disable LTO
> for that unit, as there is no way to tell for gcc what the asm statement is
> doing. Perhaps attribute would be better way to do this?
Well then this is PR 57703. Should we mark duplicate? :(
>From gcc-bugs-return-603526-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 10:05:45 2018
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85626] New: [nvptx] __builtin_trap should not return
Date: Thu, 03 May 2018 10:05:00 -0000
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Bug ID: 85626
Summary: [nvptx] __builtin_trap should not return
Product: gcc
Version: 9.0
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As mentioned here ( https://cygwin.com/ml/newlib/2018/msg00335.html ):
...
Then, the nvptx port of gcc implements __builtin_trap using the 'trap' ptx
insn.
The trap insn is documented in the ptx documentation as:
...
Abort execution and generate an interrupt to the host CPU.
...
After consulting with nvidia when running into unexpected behaviour we found
out that in fact the ptx compilers (ptxas and the JIT in the drivers) do not
consider trap a noreturn insn, and that a trap handler may return, and advised
us to add an 'exit' after the trap. I've asked them to improve the ptx
documentation (the abort is somewhat misleading), but sofar no luck there.
So, in fact nvptx __builtin_trap can return, which is a gcc bug, that I still
need to file and fix.
...
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Subject: [Bug lto/48200] linking shared library with LTO results in different exported symbols
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--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Xi Ruoyao from comment #15)
> (In reply to Jan Hubicka from comment #13)
> > Concerning comment #11, if you have toplevel asms you need to disable LTO
> > for that unit, as there is no way to tell for gcc what the asm statement is
> > doing. Perhaps attribute would be better way to do this?
>
> Well then this is PR 57703. Should we mark duplicate? :(
I think the bug is sufficiently different and should have different
workarounds.
We might want to add a function attribute to allow to specify symver, so like
int pci_fill_info_v31(struct pci_dev *d, int flags)
__attribute__((alias("pci_fill_info"), symver("@LIBPCI_3.0"));
or similar (combine alias and symver as symver_alias?). Or simply
recognize @ in alias.
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--- Comment #18 from Vincent <vincent.lextrait at gmail dot com> ---
Still in 8.1, now with a different diagnosis:
g++-8 -c -O3 67650.cpp
67650.cpp:33:8: warning: 'void AN<OC, RC>::rp() [with OC = LR<I, IE, (&
ET)>::LLC; RC = BLKC]' used but never defined
void rp(){}
^~
Ironically the message complains about the non definition of the member
function, and displays that very definition...
>From gcc-bugs-return-603529-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 10:21:38 2018
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Subject: [Bug tree-optimization/85627] New: [6/7/8/9 Regression] ICE in update_phi_components in tree-complex.c
Date: Thu, 03 May 2018 10:21:00 -0000
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Bug ID: 85627
Summary: [6/7/8/9 Regression] ICE in update_phi_components in
tree-complex.c
Product: gcc
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The testcase:
__complex double
foo (__complex double a, __complex double b)
{
__complex res = a;
try {
res = a * b;
}
catch (...) {
res = b;
}
return res;
}
compiled with
g++ -O2 -fnon-call-exceptions
ICEs with:
during GIMPLE pass: cplxlower
complex.c: In function '__complex__ double foo(__complex__ double, __complex__
double)':
complex.c:3:1: internal compiler error: Segmentation fault
foo (__complex double a, __complex double b)
^~~
0xe1b5b1 crash_signal
%SRC/gcc/toplev.c:325
0xb31899 phi_nodes_ptr
%SRC/gcc/gimple.h:4406
0xb31899 gsi_start_phis(basic_block_def*)
%SRC/gcc/gimple-iterator.c:917
0xe81fb1 update_phi_components
%SRC/gcc/tree-complex.c:747
0xe83bc8 tree_lower_complex
%SRC/gcc/tree-complex.c:1695
0xe85b7a execute
%SRC/gcc/tree-complex.c:1757
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-603530-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 10:37:32 2018
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Subject: [Bug tree-optimization/85627] [6/7/8/9 Regression] ICE in update_phi_components in tree-complex.c
Date: Thu, 03 May 2018 10:37:00 -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
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-03
Version|unknown |8.1.1
Target Milestone|--- |6.5
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
So one issue is the complex libcalls are ECF_NOTHROW. That's not really
expected with -fnon-call-exceptions. Fix required to
build_common_builtin_nodes, but it
would really need to be done per function given -fnon-call-exceptions is per
function. I guess just removing ECF_NOTHROW is good enough.
Then the issue is of course the loop over BBs in tree_lower_complex () does not
expect any CFG changes (like purging dead EH edges). We could delay this
and/or deal with BASIC_BLOCK_FOR_FN returning NULL for removed BBs.
Another issue is - after your patch - that we possibly miss some stmts if you
start to split blocks. That's already done by expand_complex_div_wide as well
so there's a pre-existing issue here.
>From gcc-bugs-return-603531-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 10:39:50 2018
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Subject: [Bug tree-optimization/85627] [6/7/8/9 Regression] ICE in update_phi_components in tree-complex.c
Date: Thu, 03 May 2018 10:39:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Part of the fix:
Index: gcc/tree-complex.c
===================================================================
--- gcc/tree-complex.c (revision 259879)
+++ gcc/tree-complex.c (working copy)
@@ -1692,6 +1692,8 @@ tree_lower_complex (void)
for (i = 0; i < n_bbs; i++)
{
bb = BASIC_BLOCK_FOR_FN (cfun, rpo[i]);
+ if (!bb)
+ continue;
update_phi_components (bb);
for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
expand_complex_operations_1 (&gsi);
>From gcc-bugs-return-603532-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 10:48:39 2018
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Subject: [Bug tree-optimization/85627] [6/7/8/9 Regression] ICE in update_phi_components in tree-complex.c
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
expand_complex_div_wide seems to work fine.
>From gcc-bugs-return-603533-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 10:52:11 2018
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Subject: [Bug tree-optimization/85627] [6/7/8/9 Regression] ICE in update_phi_components in tree-complex.c
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixing the nothrow issue reveals:
Index: tree.c
===================================================================
--- tree.c (revision 259879)
+++ tree.c (working copy)
@@ -10386,17 +10386,19 @@ build_common_builtin_nodes (void)
*q = TOLOWER (*p);
*q = '\0';
+ /* For -ftrapping-math these should throw from a former
+ -fnon-call-exception stmt. */
built_in_names[mcode] = concat (prefix, "mul", mode_name_buf, "3",
NULL);
local_define_builtin (built_in_names[mcode], ftype, mcode,
built_in_names[mcode],
- ECF_CONST | ECF_NOTHROW | ECF_LEAF);
+ ECF_CONST | ECF_LEAF);
built_in_names[dcode] = concat (prefix, "div", mode_name_buf, "3",
NULL);
local_define_builtin (built_in_names[dcode], ftype, dcode,
built_in_names[dcode],
- ECF_CONST | ECF_NOTHROW | ECF_LEAF);
+ ECF_CONST | ECF_LEAF);
}
}
t.ii:2:1: error: statement marked for throw in middle of block
foo (__complex double a, __complex double b)
^~~
_6 = __muldc3 (a$real_10, a$imag_11, b$real_12, b$imag_13);
during GIMPLE pass: cplxlower
t.ii:2:1: internal compiler error: verify_gimple failed
this is because the components are extracted after the call:
<bb 2> [local count: 1073741825]:
a$real_10 = REALPART_EXPR <a_4(D)>;
a$imag_11 = IMAGPART_EXPR <a_4(D)>;
b$real_12 = REALPART_EXPR <b_5(D)>;
b$imag_13 = IMAGPART_EXPR <b_5(D)>;
_6 = __muldc3 (a$real_10, a$imag_11, b$real_12, b$imag_13);
_14 = REALPART_EXPR <_6>;
_15 = IMAGPART_EXPR <_6>;
<bb 3> [local count: 1073741825]:
# res_2 = PHI <_6(2), b_5(D)(4)>
# res$real_16 = PHI <_14(2), b$real_12(4)>
# res$imag_17 = PHI <_15(2), b$imag_13(4)>
return res_2;
thus with EH we need to split the block after the call.
>From gcc-bugs-return-603534-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:03:18 2018
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Subject: [Bug tree-optimization/85627] [6/7/8/9 Regression] ICE in update_phi_components in tree-complex.c
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed by, for example, the following which keeps EH intact for the original
testcase if combined with the tree.c fix
Index: gcc/tree-complex.c
===================================================================
--- gcc/tree-complex.c (revision 259879)
+++ gcc/tree-complex.c (working copy)
@@ -1015,14 +1015,25 @@ expand_complex_libcall (gimple_stmt_iter
if (maybe_clean_or_replace_eh_stmt (old_stmt, stmt))
gimple_purge_dead_eh_edges (gsi_bb (*gsi));
- if (gimple_in_ssa_p (cfun))
+ type = TREE_TYPE (type);
+ if (stmt_can_throw_internal (stmt))
{
- type = TREE_TYPE (type);
- update_complex_components (gsi, stmt,
+ edge_iterator ei;
+ edge e;
+ FOR_EACH_EDGE (e, ei, gimple_bb (stmt)->succs)
+ if (!(e->flags & EDGE_EH))
+ break;
+ basic_block bb = split_edge (e);
+ gimple_stmt_iterator gsi2 = gsi_start_bb (bb);
+ update_complex_components (&gsi2, stmt,
build1 (REALPART_EXPR, type, lhs),
build1 (IMAGPART_EXPR, type, lhs));
- SSA_NAME_DEF_STMT (lhs) = stmt;
}
+ else
+ update_complex_components (gsi, stmt,
+ build1 (REALPART_EXPR, type, lhs),
+ build1 (IMAGPART_EXPR, type, lhs));
+ SSA_NAME_DEF_STMT (lhs) = stmt;
}
/* Expand complex multiplication to scalars:
>From gcc-bugs-return-603535-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:09:45 2018
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--- Comment #4 from Daniel Gutson <danielgutson at gmail dot com> ---
(In reply to Jakub Jelinek from comment #3)
> The warning really can't be implemented later than in the FE, because many
> of the non-setting uses are optimized away already during the FEs. So there
> is no way this can be handled as requested.
Ok just for educational and documentational purposes, could you please comment
1) what structural changes should be done in order to be able to get this
possible? 2) could you please point me in the code to where the first breaking
optimization is that turns this unfeasible?
If the front-end would support this, would then other benefits come up for
other analyses?
>From gcc-bugs-return-603536-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:17:42 2018
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Subject: [Bug c++/85600] [9 Regression] CPU2006 471.omnetpp fails starting with r259771
Date: Thu, 03 May 2018 11:17:00 -0000
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rdapp at linux dot ibm.com changed:
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----------------------------------------------------------------------------
CC| |rdapp at linux dot ibm.com
--- Comment #4 from rdapp at linux dot ibm.com ---
This also happens on s390x, even with -O0 and no new -march setting.
The following line in EtherMac.cc
delete outputbuffer.pop()
actually emits two calls to
cQueue::pop ().
On the second call, the queue is empty and the program terminates.
Already in the .original pass, a SAVE_EXPR that was there before is not present
anymore:
if (SAVE_EXPR <cQueue::pop [..]
vs.
if (cQueue::pop [..]
r259771 removes two checks like this:
- if (TREE_SIDE_EFFECTS (addr))
- addr = save_expr (addr);
Are they really redundant?
>From gcc-bugs-return-603537-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:25:59 2018
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Subject: [Bug tree-optimization/85627] [6/7/8/9 Regression] ICE in update_phi_components in tree-complex.c
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 44055
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44055&action=edit
patch
>From gcc-bugs-return-603538-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:33:41 2018
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Subject: [Bug lto/48200] linking shared library with LTO results in different exported symbols
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--- Comment #17 from Xi Ruoyao <ryxi at stu dot xidian.edu.cn> ---
(In reply to Richard Biener from comment #16)
> We might want to add a function attribute to allow to specify symver, so like
>
> int pci_fill_info_v31(struct pci_dev *d, int flags)
> __attribute__((alias("pci_fill_info"), symver("@LIBPCI_3.0"));
>
> or similar (combine alias and symver as symver_alias?). Or simply
> recognize @ in alias.
But a normal alias is
int pci_fill_info(struct pci_dev *, int)
__attribute__((alias("pci_fill_info_v31")));
The exported name is the function declare name, and the actual name is in alias
attribute.
I prefer
int pci_fill_info(struct pci_dev *, int)
__attribute__((symver_alias("@LIBPCI_3.0", "pci_fill_info_v31")));
>From gcc-bugs-return-603539-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:35:09 2018
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Subject: [Bug tree-optimization/85615] [8/9 Regression] ICE at -O2 and above on valid code on x86_64-linux-gnu: in dfs_enumerate_from, at cfganal.c:1197
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Regresses gcc.dg/uninit-20.c.
Trying
if (bb->loop_father != e2->src->loop_father
&& (!loop_exit_edge_p (e2->src->loop_father, e2)
|| flow_loop_nested_p (bb->loop_father,
e2->dest->loop_father)))
instead.
>From gcc-bugs-return-603540-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:37:30 2018
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Subject: [Bug ipa/85617] Wunused-but-set-variable does not analyze variables passed to functions
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--- Comment #5 from Daniel Gutson <danielgutson at gmail dot com> ---
Additionally, could you please consider to gently leave this issue open as an
enhancement?
>From gcc-bugs-return-603541-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:39:01 2018
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Subject: [Bug c++/85600] [9 Regression] CPU2006 471.omnetpp fails starting with r259771
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|powerpc64le-unknown-linux-g |
|nu |
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-03
Host|powerpc64le-unknown-linux-g |
|nu |
Ever confirmed|0 |1
Build|powerpc64le-unknown-linux-g |
|nu |
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
Also failed on x86:
https://gcc.gnu.org/ml/gcc-testresults/2018-05/msg00217.html
>From gcc-bugs-return-603542-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:42:51 2018
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Subject: [Bug c++/85600] [9 Regression] CPU2006 471.omnetpp fails starting with r259771
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--- Comment #6 from rdapp at linux dot ibm.com ---
This hunk causes the double pop():
@@ -4650,8 +4648,6 @@ build_delete (tree otype, tree addr,
special_function_kind auto_delete,
}
}
}
- if (TREE_SIDE_EFFECTS (addr))
- addr = save_expr (addr);
/* Throw away const and volatile on target type of addr. */
addr = convert_force (build_pointer_type (type), addr, 0, complain);
addr has the side-effects bit set at that point.
>From gcc-bugs-return-603543-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:50:03 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/67650] undef reference with -fdevirtualize
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Target|x86_64-apple-darwin14.4.0 |
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-03
Ever confirmed|0 |1
--- Comment #19 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:
struct RE
{
virtual void rp()=0;
void ax(){rp();}
};
struct BLKC
{
virtual void rb(){}
};
template <typename T>
struct LK : BLKC
{
T* p = nullptr;
void rb() override { p->ax();}
};
template <typename>
struct AN : RE
{
void rp() override {}
};
template <const char*>
struct LR
{
virtual ~LR(){}
struct LLC { virtual ~LLC(){} };
LK<AN<LLC>> l;
};
constexpr char ET[]="";
struct I
{
LR<ET> _e;
};
int main(){new I();}
$ g++ -Wall 67650.cc -O1 -fdevirtualize
67650.cc:22:8: warning: ‘void AN< <template-parameter-1-1> >::rp() [with
<template-parameter-1-1> = LR<(& ET)>::LLC]’ declared ‘static’ but never
defined [-Wunused-function]
void rp() override {}
^~
>From gcc-bugs-return-603544-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:50:40 2018
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From: "glaubitz at physik dot fu-berlin.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Thu, 03 May 2018 11:50:00 -0000
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--- Comment #49 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
Hi Andrew!
(In reply to Andrew Jenner from comment #21)
> I'm still actively working on it. The patch is close to ready for commit
> now, I think - I'm going to try to get it committed by the end of the week.
Is there any progress on this? Is there anything we (Debian) can do to help
you?
Do you need access to a porterbox or do you need your own powerpcspe hardware
for testing? It might be possible to arrange that, I know people who could
supply such hardware. Debian got its PowerPC e500v2 boards through donations as
well.
>From gcc-bugs-return-603545-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:53:30 2018
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Subject: [Bug c++/67650] undef reference with -fdevirtualize
Date: Thu, 03 May 2018 11:53:00 -0000
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--- Comment #20 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Vincent from comment #5)
> The problem is static time, not dynamic time.
> This artefact is just a result of source code reduction. In my code there
> is no "0", and the problem exists.
Are you sure about that? Using your original testcase I can only reproduce the
link error when it has ((T*)0)->ax()
>From gcc-bugs-return-603546-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:54:19 2018
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Subject: [Bug ipa/85617] Wunused-but-set-variable does not analyze variables passed to functions
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
E.g. cp_fold/c_fully_fold, gimplification, match.pd folding during
gimplification etc. can optimize away many uses.
I see no point in keeping open enhancement requests that are impossible to
implement.
>From gcc-bugs-return-603547-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 11:58:14 2018
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Subject: [Bug c++/67650] undef reference with -fdevirtualize
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--- Comment #21 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Comment 19 shows a bogus warning triggered by -fdevirtualize but I'm not
convinced the original report of a link-error bug is valid.
>From gcc-bugs-return-603548-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 12:17:25 2018
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Subject: [Bug tree-optimization/85588] [6/7/8/9 Regression] -fwrapv miscompilation
Date: Thu, 03 May 2018 12:17:00 -0000
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Or rather
Index: gcc/fold-const.c
===================================================================
--- gcc/fold-const.c (revision 259879)
+++ gcc/fold-const.c (working copy)
@@ -474,12 +474,15 @@ negate_expr_p (tree t)
case EXACT_DIV_EXPR:
if (TYPE_UNSIGNED (type))
break;
- if (negate_expr_p (TREE_OPERAND (t, 0)))
+ /* In general we can't negate A in A / B, because if A is INT_MIN and
+ B is not 1 we change the sign of the result. */
+ if (TREE_CODE (TREE_OPERAND (t, 0)) == INTEGER_CST
+ && negate_expr_p (TREE_OPERAND (t, 0)))
return true;
/* In general we can't negate B in A / B, because if A is INT_MIN and
B is 1, we may turn this into INT_MIN / -1 which is undefined
>From gcc-bugs-return-603549-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 12:24:46 2018
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Subject: [Bug libstdc++/84949] -ffast-math bugged with respect to NaNs
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
std::numeric_limits<float> defines:
static _GLIBCXX_USE_CONSTEXPR bool has_infinity = __FLT_HAS_INFINITY__;
static _GLIBCXX_USE_CONSTEXPR bool has_quiet_NaN = __FLT_HAS_QUIET_NAN__;
static _GLIBCXX_USE_CONSTEXPR bool has_signaling_NaN = has_quiet_NaN;
static _GLIBCXX_USE_CONSTEXPR float_denorm_style has_denorm
= bool(__FLT_HAS_DENORM__) ? denorm_present : denorm_absent;
//...
static _GLIBCXX_USE_CONSTEXPR bool is_iec559
= has_infinity && has_quiet_NaN && has_denorm == denorm_present;
And that seems to be the right thing to do. If the compiler tells us the type
has infinities and NaNs then we expose that through std::numeric_limits.
I don't think we want the C++ library to be inconsistent with the compiler
here. So maybe any change should be in the compiler not libstdc++.
>From gcc-bugs-return-603550-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 12:29:40 2018
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Subject: [Bug c++/85600] [9 Regression] CPU2006 471.omnetpp fails starting with r259771
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sudi at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sudi at gcc dot gnu.org
--- Comment #7 from sudi at gcc dot gnu.org ---
Also failing on aarch64 targets.
>From gcc-bugs-return-603551-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 12:31:26 2018
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
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Andrew Jenner <andrewjenner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #43312|0 |1
is obsolete| |
--- Comment #50 from Andrew Jenner <andrewjenner at gcc dot gnu.org> ---
Created attachment 44056
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44056&action=edit
Patch in progress as of 2018/05/03
Hi John,
Thanks for the offer of help. I already have hardware, but I need to get my
test scripts in order. I'm attaching my current patch. If you could get some
test results with and without this patch to make sure it doesn't break
anything, that would be a tremendous help. Unfortunately I've been side-tracked
onto other projects and haven't been able to give this the attention it
deserves, but I hope to get back to it in the next couple of weeks. Thanks
again!
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--- Comment #51 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to Andrew Jenner from comment #50),
>
> Thanks for the offer of help. I already have hardware, but I need to get my
> test scripts in order.
Ok, great!
> I'm attaching my current patch. If you could get some
> test results with and without this patch to make sure it doesn't break
> anything, that would be a tremendous help.
Absolutely. Where should I test the patch? Natively on powerpcspe? On x86_64?
Or anything else? We have a wide range of architectures available for testing.
> Unfortunately I've been
> side-tracked onto other projects and haven't been able to give this the
> attention it deserves, but I hope to get back to it in the next couple of
> weeks. Thanks again!
No worries. Your efforts are highly appreciated and I'm happy to help whereever
I can.
>From gcc-bugs-return-603553-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 12:37:31 2018
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Subject: [Bug c++/67650] undef reference with -fdevirtualize
Date: Thu, 03 May 2018 12:37:00 -0000
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--- Comment #22 from Vincent <vincent.lextrait at gmail dot com> ---
See comment #6.
(In reply to Jonathan Wakely from comment #20)
> (In reply to Vincent from comment #5)
> > The problem is static time, not dynamic time.
> > This artefact is just a result of source code reduction. In my code there
> > is no "0", and the problem exists.
>
> Are you sure about that? Using your original testcase I can only reproduce
> the link error when it has ((T*)0)->ax()
>From gcc-bugs-return-603554-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 12:39:04 2018
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Subject: [Bug c++/67650] undef reference with -fdevirtualize
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--- Comment #23 from Vincent <vincent.lextrait at gmail dot com> ---
See comment #10. The error is sensitive to unrelated changes. There is some
(front-end?) corruption somewhere.
(In reply to Jonathan Wakely from comment #21)
> Comment 19 shows a bogus warning triggered by -fdevirtualize but I'm not
> convinced the original report of a link-error bug is valid.
>From gcc-bugs-return-603555-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 12:42:08 2018
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
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--- Comment #52 from Andrew Jenner <andrewjenner at gcc dot gnu.org> ---
(In reply to John Paul Adrian Glaubitz from comment #51)
> Absolutely. Where should I test the patch? Natively on powerpcspe? On
> x86_64? Or anything else? We have a wide range of architectures available
> for testing.
The patch only changes the powerpcspe backend - there's no need to test it
against any other targets.
>From gcc-bugs-return-603556-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 12:49:16 2018
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From: "glaubitz at physik dot fu-berlin.de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
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--- Comment #53 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to Andrew Jenner from comment #52)
> (In reply to John Paul Adrian Glaubitz from comment #51)
> > Absolutely. Where should I test the patch? Natively on powerpcspe? On
> > x86_64? Or anything else? We have a wide range of architectures available
> > for testing.
>
> The patch only changes the powerpcspe backend - there's no need to test it
> against any other targets.
Ok. I will try a native build then.
>From gcc-bugs-return-603557-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 12:52:03 2018
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Subject: [Bug lto/48200] linking shared library with LTO results in different exported symbols
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--- Comment #18 from Xi Ruoyao <ryxi at stu dot xidian.edu.cn> ---
(In reply to Xi Ruoyao from comment #17)
> I prefer
>
> int pci_fill_info(struct pci_dev *, int)
> __attribute__((symver_alias("@LIBPCI_3.0", "pci_fill_info_v31")));
But then what should we do for
int pci_fill_info(struct pci_dev *, int)
__attribute__((symver_alias("@LIBPCI_3.0", "pci_fill_info_v31")));
int pci_fill_info(struct pci_dev *, int)
__attribute__((symver_alias("@LIBPCI_3.1", "pci_fill_info_v32")));
>From gcc-bugs-return-603558-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 13:01:05 2018
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Subject: [Bug tree-optimization/70291] muldc3 code generation could be smarter
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--- Comment #3 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Thu May 3 12:59:43 2018
New Revision: 259889
URL: https://gcc.gnu.org/viewcvs?rev=259889&root=gcc&view=rev
Log:
[tree-complex.c] PR tree-optimization/70291: Inline floating-point complex
multiplication more aggressively
We can improve the performance of complex floating-point multiplications by
inlining the expansion a bit more aggressively.
We can inline complex x = a * b as:
x = (ar*br - ai*bi) + i(ar*bi + br*ai);
if (isunordered (__real__ x, __imag__ x))
x = __muldc3 (a, b); //Or __mulsc3 for single-precision
That way the common case where no NaNs are produced we can avoid the libgcc
call and fall back to the
NaN handling stuff in libgcc if either components of the expansion are NaN.
The implementation is done in expand_complex_multiplication in tree-complex.c
and the above expansion
will be done when optimising for -O1 and greater and when not optimising for
size.
At -O0 and -Os the single call to libgcc will be emitted.
For the code:
__complex double
foo (__complex double a, __complex double b)
{
return a * b;
}
We will now emit at -O2 for aarch64:
foo:
fmul d16, d1, d3
fmul d6, d1, d2
fnmsub d5, d0, d2, d16
fmadd d4, d0, d3, d6
fcmp d5, d4
bvs .L8
fmov d1, d4
fmov d0, d5
ret
.L8:
stp x29, x30, [sp, -16]!
mov x29, sp
bl __muldc3
ldp x29, x30, [sp], 16
ret
Instead of just a branch to __muldc3.
PR tree-optimization/70291
* tree-complex.c (expand_complex_libcall): Add type, inplace_p
arguments. Change return type to tree. Emit libcall as a new
statement rather than replacing existing one when inplace_p is true.
(expand_complex_multiplication_components): New function.
(expand_complex_multiplication): Expand floating-point complex
multiplication using the above.
(expand_complex_division): Rename inner_type parameter to type.
Update expand_complex_libcall call-site.
(expand_complex_operations_1): Update expand_complex_multiplication
and expand_complex_division call-sites.
* gcc.dg/complex-6.c: New test.
* gcc.dg/complex-7.c: Likewise.
Added:
trunk/gcc/testsuite/gcc.dg/complex-6.c
trunk/gcc/testsuite/gcc.dg/complex-7.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-complex.c
>From gcc-bugs-return-603559-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 13:04:56 2018
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Subject: [Bug c++/67650] undef reference with -fdevirtualize
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--- Comment #24 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Vincent from comment #22)
> See comment #6.
I already saw it, and I already tried that change. The problem disappears if
you make that change.
(In reply to Vincent from comment #23)
> See comment #10. The error is sensitive to unrelated changes. There is some
> (front-end?) corruption somewhere.
I'm not convinced by that either.
>From gcc-bugs-return-603560-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 13:06:54 2018
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--- Comment #25 from Vincent <vincent.lextrait at gmail dot com> ---
Oh, it used to be the case. I think that must be due to some additional
artefact of more recent compilers. I'll try to find another way to show it.
(In reply to Jonathan Wakely from comment #24)
> (In reply to Vincent from comment #22)
> > See comment #6.
>
> I already saw it, and I already tried that change. The problem disappears if
> you make that change.
>
> (In reply to Vincent from comment #23)
> > See comment #10. The error is sensitive to unrelated changes. There is some
> > (front-end?) corruption somewhere.
>
> I'm not convinced by that either.
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Subject: [Bug fortran/65086] Segfault: Invalid copy-out of temporary as argument is in read-only memory
Date: Thu, 03 May 2018 13:07:00 -0000
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Jürgen Reuter <juergen.reuter at desy dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |juergen.reuter at desy dot de
--- Comment #2 from Jürgen Reuter <juergen.reuter at desy dot de> ---
I rechecked this. Same situation still with gfortran 9.0. Also ran nagfor.
nagfor behaves the same way as gfortran does, so the seg fault is only gone if
the intent(in) in sub4 is added.
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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Target Milestone|--- |9.0
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for GCC 9
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Subject: [Bug c++/67650] undef reference with -fdevirtualize
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--- Comment #26 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Vincent from comment #25)
> Oh, it used to be the case. I think that must be due to some additional
> artefact of more recent compilers. I'll try to find another way to show it.
I tried 5.1.0 and 5.2.0 and several other previous releases, they all link the
program successfully, with just this warning:
main.cpp:53:8: warning: 'I' has a field 'I::_e' whose type uses the anonymous
namespace
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Subject: [Bug c++/67650] undef reference with -fdevirtualize
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--- Comment #27 from Vincent <vincent.lextrait at gmail dot com> ---
Sorry for the silly check, are you sure you are trying with -O3 or
-fdevirtualize -O2?
You can try this with 8.1:
void *v;
template <typename T>
struct LK: public BLKC
{
void rb(){((T*)v)->ax();}
static T* st;
};
As a replacement to the call to null, and the missing definition problem is
reported.
(In reply to Jonathan Wakely from comment #26)
> (In reply to Vincent from comment #25)
> > Oh, it used to be the case. I think that must be due to some additional
> > artefact of more recent compilers. I'll try to find another way to show it.
>
> I tried 5.1.0 and 5.2.0 and several other previous releases, they all link
> the program successfully, with just this warning:
>
> main.cpp:53:8: warning: 'I' has a field 'I::_e' whose type uses the
> anonymous namespace
>From gcc-bugs-return-603565-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 13:20:42 2018
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Subject: [Bug tree-optimization/85615] [8/9 Regression] ICE at -O2 and above on valid code on x86_64-linux-gnu: in dfs_enumerate_from, at cfganal.c:1197
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu May 3 13:20:02 2018
New Revision: 259891
URL: https://gcc.gnu.org/viewcvs?rev=259891&root=gcc&view=rev
Log:
2018-05-03 Richard Biener <rguenther@suse.de>
PR tree-optimization/85615
* tree-ssa-threadupdate.c (thread_block_1): Only allow exits
to loops not nested in BBs loop father to avoid creating multi-entry
loops.
* gcc.dg/torture/pr85615.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr85615.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-threadupdate.c
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Subject: [Bug tree-optimization/85615] [8 Regression] ICE at -O2 and above on valid code on x86_64-linux-gnu: in dfs_enumerate_from, at cfganal.c:1197
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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] ICE at -O2 |[8 Regression] ICE at -O2
|and above on valid code on |and above on valid code on
|x86_64-linux-gnu: in |x86_64-linux-gnu: in
|dfs_enumerate_from, at |dfs_enumerate_from, at
|cfganal.c:1197 |cfganal.c:1197
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
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Subject: [Bug c++/67650] undef reference with -fdevirtualize
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--- Comment #28 from Vincent <vincent.lextrait at gmail dot com> ---
Other silly check, did you try with my code or your reduced code ?
(In reply to Jonathan Wakely from comment #26)
> (In reply to Vincent from comment #25)
> > Oh, it used to be the case. I think that must be due to some additional
> > artefact of more recent compilers. I'll try to find another way to show it.
>
> I tried 5.1.0 and 5.2.0 and several other previous releases, they all link
> the program successfully, with just this warning:
>
> main.cpp:53:8: warning: 'I' has a field 'I::_e' whose type uses the
> anonymous namespace
>From gcc-bugs-return-603568-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 13:27:25 2018
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Subject: [Bug tree-optimization/70291] muldc3 code generation could be smarter
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ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Known to work| |9.0
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #4 from ktkachov at gcc dot gnu.org ---
Implemented for GCC 9.
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85599] invalid optimization: function not always evaluated in logical expression
Date: Thu, 03 May 2018 13:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85599
--- Comment #10 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Dumping the original tree of the test in comment 0 gives
...
lazy ()
{
static logical(kind=4) check (void);
logical(kind=4) flag;
flag = 0;
flag = check () && flag;
flag = flag && check ();
}
...
Am I mistaken to read this as being handled by the middle-end? If yes, the
situation is discussed in pr57160 comment 1.
> *****
> 7.1.4 Evaluation of operations
> 2 The evaluation of a function reference shall neither affect nor be affected
> by the evaluation of any other entity within the statement.
> *****
Does it means that 'check' has to be evaluated in
if (flag) flag = check ()
even if flag==.false. ?
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Subject: [Bug testsuite/85106] Add scan-ltrans-tree-dump and scan-wpa-ipa-dump
Date: Thu, 03 May 2018 13:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85106
--- Comment #13 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Thu May 3 13:47:14 2018
New Revision: 259892
URL: https://gcc.gnu.org/viewcvs?rev=259892&root=gcc&view=rev
Log:
[testsuite] Add scan-offload-tree-dump
2018-05-03 Tom de Vries <tom@codesourcery.com>
PR testsuite/85106
* lib/scanoffloadtree.exp: New file.
* testsuite/lib/libgomp-dg.exp (libgomp-dg-test): Add save-temps to
extra_tool_flags if it contains an -foffload=-fdump-* flag.
* testsuite/lib/libgomp.exp: Include scanoffloadtree.exp.
* testsuite/libgomp.oacc-c/vec.c: Use scan-offload-tree-dump.
* doc/sourcebuild.texi (Commands for use in dg-final, Scan optimization
dump files): Add offload-tree.
Added:
trunk/gcc/testsuite/lib/scanoffloadtree.exp
Modified:
trunk/gcc/ChangeLog
trunk/gcc/doc/sourcebuild.texi
trunk/gcc/testsuite/ChangeLog
trunk/libgomp/ChangeLog
trunk/libgomp/testsuite/lib/libgomp-dg.exp
trunk/libgomp/testsuite/lib/libgomp.exp
trunk/libgomp/testsuite/libgomp.oacc-c/vec.c
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Subject: [Bug fortran/85599] invalid optimization: function not always evaluated in logical expression
Date: Thu, 03 May 2018 13:50:00 -0000
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--- Comment #11 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Am I mistaken to read this as being handled by the middle-end?
> If yes, the situation is discussed in pr57160 comment 1.
I meant "If no"!-(
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Subject: [Bug c++/67650] undef reference with -fdevirtualize
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |link-failure
--- Comment #29 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Vincent from comment #27)
> Sorry for the silly check, are you sure you are trying with -O3 or
> -fdevirtualize -O2?
I've tried both. I'm using x86_64-pc-linux-gnu though.
> You can try this with 8.1:
>
> void *v;
>
> template <typename T>
> struct LK: public BLKC
> {
> void rb(){((T*)v)->ax();}
> static T* st;
> };
>
> As a replacement to the call to null, and the missing definition problem is
> reported.
OK now I can reproduce it with trunk.
(In reply to Vincent from comment #28)
> Other silly check, did you try with my code or your reduced code ?
Yours.
Here's the reduced form that gives a link-error with trunk:
#include <string>
template <typename T>
struct RE
{
virtual void rp()=0;
void ax(){rp();}
};
struct EN : RE<int>
{
EN(::std::string = ""){}
void rp(){}
};
template <typename OC>
struct AN : RE<OC>
{
void rp(){}
};
template <typename T>
struct LK
{
T* p = nullptr;
virtual void rb(){p->ax();}
};
template <const char* K>
struct LR
{
virtual ~LR(){}
struct LLC { virtual ~LLC(){} };
LK<AN<LLC>> l;
};
constexpr char ET[]="";
struct I : EN
{
LR<ET> _e;
};
int main(){new I();}
$ ~/gcc/8.1.0/bin/g++ -Wall -O1 -fdevirtualize main.cc
main.cc:19:8: warning: ‘void AN<OC>::rp() [with OC = LR<(& ET)>::LLC]’ used but
never defined
void rp(){}
^~
/tmp/cc4IHAPf.o: In function `LK<AN<LR<&ET>::LLC> >::rb()':
main.cc:(.text+0x37): undefined reference to `AN<LR<&ET>::LLC>::rp()'
collect2: error: ld returned 1 exit status
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Subject: [Bug libstdc++/84535] std::thread constructor missing constraint on first argument
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May 3 14:08:36 2018
New Revision: 259893
URL: https://gcc.gnu.org/viewcvs?rev=259893&root=gcc&view=rev
Log:
PR libstdc++/84535 constrain std::thread constructor
The standard requires that the std::thread constructor is constrained so
it can't be called with a first argument of type std::thread. The
current implementation only meets that requirement if the constructor is
called with one argument, by using deleted overloads. This uses an
enable_if constraint to enforce the requirement for any number of
arguments.
Also add a static assertion to give a more readable error for invalid
arguments that cannot be invoked. Also simplify _Invoker to reduce the
error cascade for ill-formed instantiations with non-invocable
arguments.
PR libstdc++/84535
* include/std/thread (thread::__not_same): New SFINAE helper.
(thread::thread(_Callable&&, _Args&&...)): Add SFINAE constraint that
first argument is not a std::thread. Add static assertion to check
INVOKE expression is valid.
(thread::thread(thread&), thread::thread(const thread&&)): Remove.
(thread::_Invoke::_M_invoke, thread::_Invoke::operator()): Use
__invoke_result for return types and remove exception specifications.
* testsuite/30_threads/thread/cons/84535.cc: New.
Added:
trunk/libstdc++-v3/testsuite/30_threads/thread/cons/84535.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/std/thread
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Subject: [Bug target/85593] GCC on ARM allocates R3 for local variable when calling naked function with O2 optimizations enabled
Date: Thu, 03 May 2018 14:27:00 -0000
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--- Comment #4 from Austin Morton <austinpmorton at gmail dot com> ---
In my particular case I was able to work around the issue by removing the naked
attribute and using extended assembly with a clobbers list.
The resulting code is nearly identical (allowing GCC to generate the correct
pro/epilog instead of hand writing it), and gcc correctly allocates R4 instead
of R3.
This still feels like a bug in GCC. In the example I gave, if you compiled the
naked function in a separate C file and linked them it would generate the
correct code. The issue is that GCC is able to "see" the naked function and is
performing optimizations that it shouldn't as a result.
I believe that GCC should treat naked functions as opaque as far as
optimizations are concerned.
At the very least, there should be a note about this kind of issue included in
the documentation of the naked attribute.
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Subject: [Bug middle-end/60646] Investigate improved complex division algorithms
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ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ktkachov at gcc dot gnu.org
--- Comment #7 from ktkachov at gcc dot gnu.org ---
Regarding performance, the paper from the description indicates the "Improved"
algorithm is the highest performing one and is more resistant to overflows and
underflows. Am I reading that right?
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Subject: [Bug target/85628] New: Make better use of BFI (BFXIL)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85628
Bug ID: 85628
Summary: Make better use of BFI (BFXIL)
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: ktkachov at gcc dot gnu.org
Target Milestone: ---
Target: aarch64
The testcase:
unsigned long long combine(unsigned long long a, unsigned long long b) {
return (a & 0xffffffff00000000ll) | (b & 0x00000000ffffffffll);
}
void read2(unsigned long long a, unsigned long long b, unsigned long long *c,
unsigned long long *d) {
*c = combine(a, b); *d = combine(b, a);
}
on aarch64 with -O2 currently generates:
combine:
bfi x0, x1, 0, 32
ret
read2:
and x5, x1, 4294967295
and x4, x0, -4294967296
orr x4, x4, x5
and x1, x1, -4294967296
and x0, x0, 4294967295
str x4, [x2]
orr x0, x0, x1
str x0, [x3]
ret
With LLVM it does a better job:
combine: // @combine
bfxil x0, x1, #0, #32
ret
read2: // @read2
mov x8, x0
bfxil x8, x1, #0, #32
bfxil x1, x0, #0, #32
str x8, [x2]
str x1, [x3]
ret
This should just be a matter of adding the necessary patterns in aarch64.md.
Combine already tries to match:
(set (reg:DI 105)
(ior:DI (and:DI (reg/v:DI 97 [ b ])
(const_int -4294967296 [0xffffffff00000000]))
(and:DI (reg/v:DI 96 [ a ])
(const_int 4294967295 [0xffffffff]))))
>From gcc-bugs-return-603577-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 14:53:51 2018
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Subject: [Bug bootstrap/85629] New: GCC 8.1.0: FTBFS: make check fails in Go part
Date: Thu, 03 May 2018 14:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85629
Bug ID: 85629
Summary: GCC 8.1.0: FTBFS: make check fails in Go part
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: kdevel at vogtner dot de
Target Milestone: ---
Centos 6.9 final, X86_64, expect installed, dejagnu not installed
$ grep ^FAIL build.log.2018-05-02T20\:49\:37
FAIL: go test cmd/go
FAIL: go test runtime
FAIL: TestBreakpoint
FAIL: TestCatchPanic
FAIL: TestCgoCallbackGC
FAIL: TestCgoCCodeSIGPROF
FAIL: TestCgoCheckBytes
FAIL: TestCgoCrashHandler
FAIL: TestCgoExecSignalMask
FAIL: TestCgoExternalThreadPanic
FAIL: TestCgoExternalThreadSignal
FAIL: TestCgoExternalThreadSIGPROF
FAIL: TestCgoLockOSThreadExit
FAIL: TestCgoNumGoroutine
FAIL: TestCgoPanicDeadlock
FAIL: TestCgoSignalDeadlock
FAIL: TestCgoTraceback
FAIL: TestCgoTracebackSigpanic
FAIL: TestCrashDumpsAllThreads
FAIL: TestCrashHandler
FAIL: TestEnsureDropM
FAIL: TestGccgoCrashTraceback
FAIL: TestGccgoCrashTracebackNodebug
FAIL: TestGCFairness
FAIL: TestGCFairness2
FAIL: TestGoexitCrash
FAIL: TestGoexitDeadlock
FAIL: TestGoexitInPanic
FAIL: TestGoNil
FAIL: TestInitDeadlock
FAIL: TestLargeStringConcat
FAIL: TestLockedDeadlock
FAIL: TestLockedDeadlock2
FAIL: TestLockOSThreadExit
FAIL: TestMainGoroutineID
FAIL: TestNetpollDeadlock
FAIL: TestNoHelperGoroutines
FAIL: TestNumGoroutine
FAIL: TestPanicAfterGoexit
FAIL: TestPanicDeadlockGosched
FAIL: TestPanicDeadlockSyscall
FAIL: TestPanicLoop
FAIL: TestPanicRace
FAIL: TestPanicTraceback
FAIL: TestRecoveredPanicAfterGoexit
FAIL: TestRecursivePanic
FAIL: TestSignalDuringExec
FAIL: TestSignalExitStatus
FAIL: TestSignalIgnoreSIGTRAP
FAIL: TestSigStackSwapping
FAIL: TestSimpleDeadlock
FAIL: TestThreadExhaustion
FAIL: go test misc/cgo/test
FAIL: go test misc/cgo/testcarchive
FAIL: go test cmd/vet
>From gcc-bugs-return-603579-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 15:01:59 2018
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Subject: [Bug libstdc++/84087] string::assign problem with two arguments
Date: Thu, 03 May 2018 15:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84087
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May 3 15:01:20 2018
New Revision: 259895
URL: https://gcc.gnu.org/viewcvs?rev=259895&root=gcc&view=rev
Log:
PR libstdc++/84087 add default arguments to basic_string members (LWG 2268)
This change was a DR against C++11 and so should have been implemented
years ago.
PR libstdc++/84087 LWG DR 2268 basic_string default arguments
* include/bits/basic_string.h [_GLIBCXX_USE_CXX11_ABI=1]
(append(const basic_string&, size_type, size_type)
(assign(const basic_string&, size_type, size_type)
(insert(size_type, const basic_string&, size_type, size_type)
(replace(size_type,size_type,const basic_string&,size_type,size_type)
(compare(size_type,size_type,constbasic_string&,size_type,size_type)):
Add default arguments (LWG 2268).
[_GLIBCXX_USE_CXX11_ABI=0]
(append(const basic_string&, size_type, size_type)
(assign(const basic_string&, size_type, size_type)
(insert(size_type, const basic_string&, size_type, size_type)
(replace(size_type,size_type,const basic_string&,size_type,size_type)
(compare(size_type,size_type,constbasic_string&,size_type,size_type)):
Likewise.
* testsuite/21_strings/basic_string/dr2268.cc: New test.
Added:
trunk/libstdc++-v3/testsuite/21_strings/basic_string/dr2268.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/bits/basic_string.h
>From gcc-bugs-return-603578-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 15:01:17 2018
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Subject: [Bug bootstrap/85630] New: GCC 8.1.0: Filesystem pollution during build: .cache dir in $HOME
Date: Thu, 03 May 2018 15:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85630
Bug ID: 85630
Summary: GCC 8.1.0: Filesystem pollution during build: .cache
dir in $HOME
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: kdevel at vogtner dot de
Target Milestone: ---
After a make bootstrap and make test (which failed, Bug 85629) a directory
named ".cache" is left over in $HOME. It contains a sub-directory "go-build":
$ ls
00 09 12 1b 24 2d 36 3f 48 51 5a 63 6c 75 7e 87 90 99 a2 ab
b4 bd c6 cf d8 e1 ea f3 fc
01 0a 13 1c 25 2e 37 40 49 52 5b 64 6d 76 7f 88 91 9a a3 ac
b5 be c7 d0 d9 e2 eb f4 fd
02 0b 14 1d 26 2f 38 41 4a 53 5c 65 6e 77 80 89 92 9b a4 ad
b6 bf c8 d1 da e3 ec f5 fe
03 0c 15 1e 27 30 39 42 4b 54 5d 66 6f 78 81 8a 93 9c a5 ae
b7 c0 c9 d2 db e4 ed f6 ff
04 0d 16 1f 28 31 3a 43 4c 55 5e 67 70 79 82 8b 94 9d a6 af
b8 c1 ca d3 dc e5 ee f7 log.txt
05 0e 17 20 29 32 3b 44 4d 56 5f 68 71 7a 83 8c 95 9e a7 b0
b9 c2 cb d4 dd e6 ef f8 README
06 0f 18 21 2a 33 3c 45 4e 57 60 69 72 7b 84 8d 96 9f a8 b1
ba c3 cc d5 de e7 f0 f9 trim.txt
07 10 19 22 2b 34 3d 46 4f 58 61 6a 73 7c 85 8e 97 a0 a9 b2
bb c4 cd d6 df e8 f1 fa
08 11 1a 23 2c 35 3e 47 50 59 62 6b 74 7d 86 8f 98 a1 aa b3
bc c5 ce d7 e0 e9 f2 fb
$ cat README
This directory holds cached build artifacts from the Go build system.
Run "go clean -cache" if the directory is getting too large.
See golang.org to learn more about Go.
These files shall be placed in the build-directory and not in $HOME.
>From gcc-bugs-return-603580-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 15:02:34 2018
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Subject: [Bug fortran/85631] New: Runtime error message array bound mismatch with nonzero optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85631
Bug ID: 85631
Summary: Runtime error message array bound mismatch with
nonzero optimization
Product: gcc
Version: 8.1.0
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Host: x86_64-pc-linux-gnu
! Runtime error message on good Fortran
! gfortran -O -g -fcheck=bounds
! must be compiled and run
!At line 20 of file pcp2k.f
!Fortran runtime error: Array bound mismatch for dimension 1 of array
'__var_1_mma' (0/2)
!Error termination. Backtrace:
!#0 0x1496530ec2de in ???
!#1 0x1496530ece89 in ???
!#2 0x1496530ed26b in ???
!#3 0x40082d in MAIN__
! at /home/vitti/test/pcp2k.f:8
!#4 0x40086e in main
! at /home/vitti/test/pcp2k.f:9
integer, parameter :: N=2
real, dimension(:,:), pointer :: block_1, block_2
allocate(block_1(N,N),block_2(N,N))
block_1=0
block_2=0
block_1 = MATMUL(TRANSPOSE(block_1), block_2)
end
>From gcc-bugs-return-603581-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 15:14:25 2018
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Subject: [Bug libstdc++/84087] string::assign problem with two arguments
Date: Thu, 03 May 2018 15:14:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|deferred |
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is fixed on trunk now. I'll probably backport it to the release branches.
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Subject: [Bug fortran/85631] [8/9 Regression] Runtime error message array bound mismatch with nonzero optimization
Date: Thu, 03 May 2018 15:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85631
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| |2018-05-03
CC| |tkoenig at gcc dot gnu.org
Ever confirmed|0 |1
Summary|Runtime error message array |[8/9 Regression] Runtime
|bound mismatch with nonzero |error message array bound
|optimization |mismatch with nonzero
| |optimization
Target Milestone|--- |8.2
Known to fail| |8.1.0, 9.0
--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Confirmed on 8 and trunk (9.0), likely r248553. Usual workaround: compile with
-fno-frontend-optimize.
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Subject: [Bug libstdc++/85632] New: std::filesystem::space or std::experimental::filesystem::space does not return correct information
Date: Thu, 03 May 2018 15:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85632
Bug ID: 85632
Summary: std::filesystem::space or
std::experimental::filesystem::space does not return
correct information
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
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I'm typing this report on my phone so forgive me for not perfect formatting.
The bug is simple, filesystem::space() probably won't return correct info for
most modern storage device that contain a big enough partition (anything more
than 4GB counts). The cause of this bug is simply that the author forgot
static_cast<uintmax_t>(data retrieved by statvfs) before the calculation. So
the fix is also trivial and can definitely backport to all version contain
experimental::filesystem.
The latest 8.1 release shares this bug, confirmed with the git mirror hours
ago.
>From gcc-bugs-return-603584-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 16:08:49 2018
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Subject: [Bug libstdc++/82644] Non-standard hypergeometric special functions defined in strict modes
Date: Thu, 03 May 2018 16:08:00 -0000
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Bah, now we have failures for TR1 with -std=c++17 or -std=c++2a:
$ ~/gcc/8/bin/g++ -std=c++17 -include tr1/cmath -x c++ /dev/null
In file included from <command-line>:
/home/jwakely/gcc/8/include/c++/8.0.1/tr1/cmath:1163:20: error:
‘__gnu_cxx::conf_hypergf’ has not been declared
using __gnu_cxx::conf_hypergf;
^~~~~~~~~~~~
/home/jwakely/gcc/8/include/c++/8.0.1/tr1/cmath:1164:20: error:
‘__gnu_cxx::conf_hypergl’ has not been declared
using __gnu_cxx::conf_hypergl;
^~~~~~~~~~~~
/home/jwakely/gcc/8/include/c++/8.0.1/tr1/cmath:1165:20: error:
‘__gnu_cxx::conf_hyperg’ has not been declared
using __gnu_cxx::conf_hyperg;
^~~~~~~~~~~
/home/jwakely/gcc/8/include/c++/8.0.1/tr1/cmath:1203:20: error:
‘__gnu_cxx::hypergf’ has not been declared
using __gnu_cxx::hypergf;
^~~~~~~
/home/jwakely/gcc/8/include/c++/8.0.1/tr1/cmath:1204:20: error:
‘__gnu_cxx::hypergl’ has not been declared
using __gnu_cxx::hypergl;
^~~~~~~
/home/jwakely/gcc/8/include/c++/8.0.1/tr1/cmath:1205:20: error:
‘__gnu_cxx::hyperg’ has not been declared
using __gnu_cxx::hyperg;
^~~~~~
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Subject: [Bug libstdc++/85632] std::filesystem::space or std::experimental::filesystem::space does not return correct information
Date: Thu, 03 May 2018 16:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85632
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-03
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
Ever confirmed|0 |1
>From gcc-bugs-return-603586-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 16:28:39 2018
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From: "jtaylor.debian at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85633] New: [8 Regression] reorders function ignoring fpu exception state
Date: Thu, 03 May 2018 16:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85633
Bug ID: 85633
Summary: [8 Regression] reorders function ignoring fpu
exception state
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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gcc-8 seems to ignore the global fpu exception state when reordering functions.
In this example it reorders the fpu_invalid_set_function which is _not_ marked
as const before the last _mm_min_ps call which can set the fpu invalid
exception.
#include <emmintrin.h>
int fpu_invalid_set(void);
float reduce(__m128 a);
float fun(float *a)
{
__m128 c1 = _mm_set_ps1(1000);
__m128 c2 = _mm_set_ps1(1000);
for (int i=0; i < 64; i+=8) {
__m128 x1 = _mm_loadu_ps(&a[i]);
__m128 x2 = _mm_loadu_ps(&a[i+4]);
c1 = _mm_min_ps(c1, x1);
c2 = _mm_min_ps(c2, x2);
}
c1 = _mm_min_ps(c1, c2);
if (fpu_invalid_set()) {
return 1;
}
else {
return reduce(c1);
}
}
gcc -O2 -c fun.c
objdump -d fun.o
0000000000000000 <fun>:
0: 48 83 ec 28 sub $0x28,%rsp
4: 0f 28 0d 00 00 00 00 movaps 0x0(%rip),%xmm1 # b <fun+0xb>
b: 48 8d 87 00 01 00 00 lea 0x100(%rdi),%rax
12: 0f 28 c1 movaps %xmm1,%xmm0
15: 0f 1f 00 nopl (%rax)
18: 0f 10 17 movups (%rdi),%xmm2
1b: 0f 10 5f 10 movups 0x10(%rdi),%xmm3
1f: 48 83 c7 20 add $0x20,%rdi
23: 0f 5d c2 minps %xmm2,%xmm0
26: 0f 5d cb minps %xmm3,%xmm1
29: 48 39 f8 cmp %rdi,%rax
2c: 75 ea jne 18 <fun+0x18>
2e: 0f 29 44 24 10 movaps %xmm0,0x10(%rsp)
33: 0f 29 0c 24 movaps %xmm1,(%rsp)
37: e8 00 00 00 00 callq 3c <fun+0x3c> <<<<<<<<<<<< call to early
3c: 0f 28 0c 24 movaps (%rsp),%xmm1
40: 0f 28 44 24 10 movaps 0x10(%rsp),%xmm0
45: 85 c0 test %eax,%eax
47: 74 17 je 60 <fun+0x60>
49: f3 0f 10 05 00 00 00 movss 0x0(%rip),%xmm0 # 51 <fun+0x51>
50: 00
51: 48 83 c4 28 add $0x28,%rsp
55: c3 retq
56: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
5d: 00 00 00
60: 0f 5d c1 minps %xmm1,%xmm0 <<<<<<<<<<< min at wrong
place
63: 48 83 c4 28 add $0x28,%rsp
67: e9 00 00 00 00 jmpq 6c <fun+0x6c>
gcc 7 and earlier execute the minps instruction before calling the function
that checks the fpu state.
>From gcc-bugs-return-603587-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 16:55:07 2018
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Subject: [Bug middle-end/85633] reorders function ignoring fpu exception state
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|c |middle-end
Summary|[8 Regression] reorders |reorders function ignoring
|function ignoring fpu |fpu exception state
|exception state |
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There is no tie between FPU operations and function calls. This is not a
regression as it was just done by accident between GCC 8.
>From gcc-bugs-return-603588-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:05:48 2018
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Subject: [Bug middle-end/85633] reorders function ignoring fpu exception state
Date: Thu, 03 May 2018 17:05:00 -0000
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--- Comment #2 from Julian Taylor <jtaylor.debian at googlemail dot com> ---
changing the fpu state does not count as a side effect?
This doesn't seem plausible, this type of code is one the reasons the fpu
exception state exists.
There is a lot of code written with this in mind which worked for decades and
now not anymore. I think that classifies as a regression.
>From gcc-bugs-return-603590-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:07:46 2018
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Subject: [Bug middle-end/85633] reorders function ignoring fpu exception state
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
See PR 38960 for why I said this is not a regression.
>From gcc-bugs-return-603589-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:07:33 2018
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From: "vincent.lextrait at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/67650] undef reference with -fdevirtualize
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--- Comment #30 from Vincent <vincent.lextrait at gmail dot com> ---
Am using OSX, but I do not believe it makes a big difference. Thanks, Jonathan,
let me know if I can help in any way.
(In reply to Jonathan Wakely from comment #29)
> (In reply to Vincent from comment #27)
> > Sorry for the silly check, are you sure you are trying with -O3 or
> > -fdevirtualize -O2?
>
> I've tried both. I'm using x86_64-pc-linux-gnu though.
>
>
> > You can try this with 8.1:
> >
> > void *v;
> >
> > template <typename T>
> > struct LK: public BLKC
> > {
> > void rb(){((T*)v)->ax();}
> > static T* st;
> > };
> >
> > As a replacement to the call to null, and the missing definition problem is
> > reported.
>
> OK now I can reproduce it with trunk.
>
> (In reply to Vincent from comment #28)
> > Other silly check, did you try with my code or your reduced code ?
>
> Yours.
>
> Here's the reduced form that gives a link-error with trunk:
>
> #include <string>
>
> template <typename T>
> struct RE
> {
> virtual void rp()=0;
> void ax(){rp();}
> };
>
> struct EN : RE<int>
> {
> EN(::std::string = ""){}
> void rp(){}
> };
>
> template <typename OC>
> struct AN : RE<OC>
> {
> void rp(){}
> };
>
> template <typename T>
> struct LK
> {
> T* p = nullptr;
> virtual void rb(){p->ax();}
> };
>
> template <const char* K>
> struct LR
> {
> virtual ~LR(){}
> struct LLC { virtual ~LLC(){} };
> LK<AN<LLC>> l;
> };
>
> constexpr char ET[]="";
> struct I : EN
> {
> LR<ET> _e;
> };
>
> int main(){new I();}
>
>
> $ ~/gcc/8.1.0/bin/g++ -Wall -O1 -fdevirtualize main.cc
> main.cc:19:8: warning: ‘void AN<OC>::rp() [with OC = LR<(& ET)>::LLC]’ used
> but never defined
> void rp(){}
> ^~
> /tmp/cc4IHAPf.o: In function `LK<AN<LR<&ET>::LLC> >::rb()':
> main.cc:(.text+0x37): undefined reference to `AN<LR<&ET>::LLC>::rp()'
> collect2: error: ld returned 1 exit status
>From gcc-bugs-return-603591-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:10:37 2018
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85628] Make better use of BFI (BFXIL)
Date: Thu, 03 May 2018 17:10:00 -0000
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>This should just be a matter of adding the necessary patterns in aarch64.md.
I was doing for MIPS and it was rejected because combine or something before
combine should be generating zero_extract on the set side.
>From gcc-bugs-return-603592-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:20:39 2018
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From: "andrew at ishiboo dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85634] New: 8.1 ICE in tsubst_copy, at cp/pt.c:15483
Date: Thu, 03 May 2018 17:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85634
Bug ID: 85634
Summary: 8.1 ICE in tsubst_copy, at cp/pt.c:15483
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: andrew at ishiboo dot com
Target Milestone: ---
Easily reproducible on a RHEL6 Linux box using the just released GCC 8.1.0
compiler built from source.
1) Clone https://github.com/bloomberg/bde
2) cd bde/groups/bsl/bslstl
3) Compile bslstl_queue.t.cpp
The full compiler command line and output is:
g++-8 \
-Wall -Wno-unused-variable \
-DBDE_BUILD_TARGET_EXC \
-DBDE_BUILD_TARGET_MT \
-DBDE_BUILD_TARGET_OPT \
-fexceptions \
-O2 \
-fno-gcse \
-fno-strict-aliasing \
-DNDEBUG \
-D_POSIX_PTHREAD_SEMANTICS \
-D_REENTRANT \
-D_FILE_OFFSET_BITS=64 \
-DBDE_NO_CPP_STDLIB \
-D_RWSTD_COMPILE_INSTANTIATE=1 \
-I. \
-I../bslalg \
-I../bsltf \
-I../bslma \
-I../bslh \
-I../bslmf \
-I../bslscm \
-I../bsls \
-c \
-o /dev/null \
bslstl_queue.t.cpp
Output:
bslstl_queue.t.cpp: In instantiation of 'static void TestDriver<VALUE,
CONTAINER>::testCase6() [with VALUE = signed char; CONTAINER =
bsl::deque<signed char, bsl::allocator<signed char> >]':
bslstl_queue.t.cpp:6618:9: required from here
bslstl_queue.t.cpp:5114:21: internal compiler error: in tsubst_copy, at
cp/pt.c:15483
operatorPtr operatorEq = operator==;
^~~~~~~~~~
0x6fe553 tsubst_copy
../../gcc/cp/pt.c:15483
0x6f75dc tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/cp/pt.c:18975
0x6fc177 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/cp/pt.c:17412
0x6fd5e5 tsubst_init
../../gcc/cp/pt.c:15274
0x6fce7e tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/cp/pt.c:16726
0x6fbb04 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/cp/pt.c:16599
0x6fc0b5 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/cp/pt.c:16896
0x6fbb04 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/cp/pt.c:16599
0x6fc0b5 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/cp/pt.c:16896
0x6fa6ad instantiate_decl(tree_node*, bool, bool)
../../gcc/cp/pt.c:23977
0x715b1b instantiate_pending_templates(int)
../../gcc/cp/pt.c:24093
0x673430 c_parse_final_cleanups()
../../gcc/cp/decl2.c:4725
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
>From gcc-bugs-return-603593-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:22:10 2018
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Subject: [Bug c++/85634] 8.1 ICE in tsubst_copy, at cp/pt.c:15483
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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> ---
Please submit a full bug report, with preprocessed source if appropriate.
>From gcc-bugs-return-603594-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:27:45 2018
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Subject: [Bug middle-end/85633] reorders function ignoring fpu exception state
Date: Thu, 03 May 2018 17:27:00 -0000
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--- Comment #4 from Julian Taylor <jtaylor.debian at googlemail dot com> ---
Oh that is unfortunate.
I guess one has to inject the dependency in the fpu checking function as an
argument then.
>From gcc-bugs-return-603595-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:29:07 2018
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Subject: [Bug c++/80947] [6/7 Regression] Different visibility for the lambda and its capture list members with -fvisibility=hidden
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Duarte <duarte at scylladb dot com> changed:
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--- Comment #16 from Duarte <duarte at scylladb dot com> ---
This is happening again in g++ (GCC) 8.0.1 20180324 (Red Hat 8.0.1-0.20).
>From gcc-bugs-return-603596-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:38:44 2018
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Subject: [Bug libstdc++/84769] variant::get(): unscoped call to get<size_t>
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--- Comment #6 from Duarte <duarte at scylladb dot com> ---
I think that calls to get<0> should be scoped, for example in visit().
>From gcc-bugs-return-603597-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:41:16 2018
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Subject: [Bug c++/85634] 8.1 ICE in tsubst_copy, at cp/pt.c:15483
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--- Comment #2 from Andrew Paprocki <andrew at ishiboo dot com> ---
Created attachment 44057
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44057&action=edit
-save-temps output
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--- Comment #3 from Andrew Paprocki <andrew at ishiboo dot com> ---
Compiler info:
$ g++-8 -v
Reading specs from /dev/shm/refroot/opt/bb/lib/gcc-8.1/bin/../lib/gcc/specs
COLLECT_GCC=/dev/shm/refroot/opt/bb/bin/g++-8
COLLECT_LTO_WRAPPER=/dev/shm/refroot/opt/bb/lib/gcc-8.1/bin/../libexec/gcc/x86_64-unknown-linux-gnu/8.1.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --enable-languages=c,c++,fortran,go
--build=x86_64-unknown-linux-gnu --prefix=/opt/bb/lib/gcc-8.1
--with-ar=/opt/rh/devtoolset-4/root/usr/bin/ar
--with-ld=/opt/rh/devtoolset-4/root/usr/bin/ld
--with-nm=/opt/rh/devtoolset-4/root/usr/bin/nm
--with-objcopy=/opt/rh/devtoolset-4/root/usr/bin/objcopy
--with-objdump=/opt/rh/devtoolset-4/root/usr/bin/objdump
--with-ranlib=/opt/rh/devtoolset-4/root/usr/bin/ranlib
--with-readelf=/opt/rh/devtoolset-4/root/usr/bin/readelf
--with-gmp-include=/opt/bb/include --with-gmp-lib=/opt/bb/lib64
--with-mpfr-include=/opt/bb/include --with-mpfr-lib=/opt/bb/lib64
--with-mpc-include=/opt/bb/include --with-mpc-lib=/opt/bb/lib64
--with-libiconv-prefix=/tmp/gcc-8.1-8.1.0-0/build/iconv
--with-stage1-ldflags='-Wl,--enable-new-dtags -Wl,-R/opt/bb/lib64'
--with-boot-ldflags='-Wl,--enable-new-dtags -Wl,-R/opt/bb/lib64'
--enable-plugin --enable-vtable-verify --disable-bootstrap
Thread model: posix
gcc version 8.1.0
Host info:
RHEL6
$ uname -a
Linux nylxdev1 2.6.32-642.6.2.el6.x86_64 #1 SMP Mon Oct 24 10:22:33 EDT 2016
x86_64 x86_64 x86_64 GNU/Linux
>From gcc-bugs-return-603599-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:43:18 2018
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Subject: [Bug c++/85634] 8.1 ICE in tsubst_copy, at cp/pt.c:15483
Date: Thu, 03 May 2018 17:43:00 -0000
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--- Comment #4 from Andrew Paprocki <andrew at ishiboo dot com> ---
(In reply to Marek Polacek from comment #1)
> Please submit a full bug report, with preprocessed source if appropriate.
I had to attach the .ii and .s file tgz'd due to the file size limit of the
bugtracker.
>From gcc-bugs-return-603600-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:47:41 2018
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From: "antoshkka at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/82899] *this in constructors could not alias with reference input parameters of the same type
Date: Thu, 03 May 2018 17:47:00 -0000
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--- Comment #8 from Antony Polukhin <antoshkka at gmail dot com> ---
(In reply to Richard Biener from comment #4)
> (In reply to Antony Polukhin from comment #2)
> > Looks like [class.ctor] paragraph 14 covers this case:
> >
> > "During the construction of an object, if the value of the object or any of
> > its subobjects is accessed through
> > a glvalue that is not obtained, directly or indirectly, from the
> > constructor’s this pointer, the value of the
> > object or subobject thus obtained is unspecified."
>
> Yeah, sounds like covering this case. Thus we can make 'this' restrict in
> constructors (and possibly assignment operators if self-assignment is
> forbidden).
Self assignment is tricky and is OK to alias in most cases. It could be
restricted at some point after the `this != &rhs` check (as proposed in Bug
82918).
I'd rather start by "restricting this" for copy and move constructors, leaving
assignment as is.
>From gcc-bugs-return-603601-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:52:03 2018
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From: "gnugcc at marino dot st" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ada/85635] New: gcc8+: typo in link.c renders gnat unbuildable on non-windows, non hpux
Date: Thu, 03 May 2018 17:52:00 -0000
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Bug ID: 85635
Summary: gcc8+: typo in link.c renders gnat unbuildable on
non-windows, non hpux
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
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Target Milestone: ---
There was a bug introduced at trunk@254573 on (2017-11-09 Pascal Obry
<obry@adacore.com>)
Specifically, a macro condition was modified improperly, resulting in a broken
build on gcc release 8.1 and trunk.
The following (obvious) patch needs to be applied to fix it:
--- gcc/ada/link.c.orig 2018-05-03 17:24:27 UTC
+++ gcc/ada/link.c
@@ -104,7 +104,7 @@ unsigned char __gnat_separate_run_path_o
const char *__gnat_default_libgcc_subdir = "lib";
#elif defined (__FreeBSD__) || defined (__DragonFly__) \
- || defined (__NetBSD__) || defined (__OpenBSD__)
+ || defined (__NetBSD__) || defined (__OpenBSD__) \
|| defined (__QNX__)
const char *__gnat_object_file_option = "-Wl,@";
const char *__gnat_run_path_option = "-Wl,-rpath,";
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
To be precise, only {Free,Net,Open}BSD, QNX and DragonFly ada is broken.
>From gcc-bugs-return-603602-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 17:56:13 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++/85634] [8/9 Regression] ICE in tsubst_copy, at cp/pt.c:15483
Date: Thu, 03 May 2018 17:56:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-03
Target Milestone|--- |8.2
Summary|8.1 ICE in tsubst_copy, at |[8/9 Regression] ICE in
|cp/pt.c:15483 |tsubst_copy, at
| |cp/pt.c:15483
Ever confirmed|0 |1
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Thanks. Confirmed, started with r248250.
>From gcc-bugs-return-603604-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 18:07:35 2018
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Subject: [Bug ada/85635] gcc8+: typo in link.c renders gnat unbuildable on non-windows, non hpux
Date: Thu, 03 May 2018 18:07:00 -0000
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--- Comment #2 from John Marino <gnugcc at marino dot st> ---
I would think every condition after (e.g. __APPLE__, __linux__, _AIX) would
fail as well. Wouldn't cpp abort on QNX before the __APPLE__ condition is
evaluated?
>From gcc-bugs-return-603605-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 18:48:58 2018
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Subject: [Bug libstdc++/84769] variant::get(): unscoped call to get<size_t>
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Thanks, I thought I'd searched for any others. Apparently not.
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--- Comment #8 from Duarte <duarte at scylladb dot com> ---
I tried to go ahead and send a patch for this (should be on the gcc-patches and
libstdc++ lists).
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Subject: [Bug libstdc++/85632] std::filesystem::space or std::experimental::filesystem::space does not return correct information
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85632
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May 3 18:58:00 2018
New Revision: 259901
URL: https://gcc.gnu.org/viewcvs?rev=259901&root=gcc&view=rev
Log:
PR libstdc++/85632 fix wraparound in filesystem::space
On 32-bit targets any values over 4GB would wrap and produce the wrong
result.
PR libstdc++/85632 use uintmax_t for arithmetic
* src/filesystem/ops.cc (experimental::filesystem::space): Perform
arithmetic in result type.
* src/filesystem/std-ops.cc (filesystem::space): Likewise.
* testsuite/27_io/filesystem/operations/space.cc: Check total capacity
is greater than free space.
* testsuite/experimental/filesystem/operations/space.cc: New.
Added:
trunk/libstdc++-v3/testsuite/experimental/filesystem/operations/space.cc
- copied, changed from r259900,
trunk/libstdc++-v3/testsuite/27_io/filesystem/operations/space.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/src/filesystem/ops.cc
trunk/libstdc++-v3/src/filesystem/std-ops.cc
trunk/libstdc++-v3/testsuite/27_io/filesystem/operations/space.cc
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Subject: [Bug libstdc++/84769] variant::get(): unscoped call to get<size_t>
Date: Thu, 03 May 2018 18:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84769
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May 3 18:58:04 2018
New Revision: 259902
URL: https://gcc.gnu.org/viewcvs?rev=259902&root=gcc&view=rev
Log:
PR libstdc++/84769 qualify call to std::get<0>
PR libstdc++/84769
* include/std/variant (visit): Qualify std::get call.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/std/variant
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Subject: [Bug target/85530] [X86] _mm512_mullox_epi64 and _mm512_mask_mullox_epi64 not implemented
Date: Thu, 03 May 2018 19:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85530
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu May 3 18:59:39 2018
New Revision: 259903
URL: https://gcc.gnu.org/viewcvs?rev=259903&root=gcc&view=rev
Log:
PR target/85530
* config/i386/avx512fintrin.h (_mm512_mullox_epi64,
_mm512_mask_mullox_epi64): New intrinsics.
* gcc.target/i386/avx512f-vpmullq-1.c: New test.
* gcc.target/i386/avx512f-vpmullq-2.c: New test.
* gcc.target/i386/avx512dq-vpmullq-3.c: New test.
* gcc.target/i386/avx512dq-vpmullq-4.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/avx512dq-vpmullq-3.c
trunk/gcc/testsuite/gcc.target/i386/avx512dq-vpmullq-4.c
trunk/gcc/testsuite/gcc.target/i386/avx512f-vpmullq-1.c
trunk/gcc/testsuite/gcc.target/i386/avx512f-vpmullq-2.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/avx512fintrin.h
trunk/gcc/testsuite/ChangeLog
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85530
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Implemented for GCC9+.
>From gcc-bugs-return-603611-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 19:44:56 2018
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From: "rsandifo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/85636] New: Tree if-conversion inserts bogus loads
Date: Thu, 03 May 2018 19:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85636
Bug ID: 85636
Summary: Tree if-conversion inserts bogus loads
Product: gcc
Version: unknown
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Compiling this at -O3 on aarch64-linux-gnu:
void f (int *a, int *b, int *c, int x, int y)
{
for (int i = 0; i < 100; ++i)
{
int v = c[i];
a[i] = (v == 20 ? x : y);
b[i] = (v != 20 ? x : y);
}
}
gives the following basic block after if-conversion:
_1 = (long unsigned int) i_31;
_2 = _1 * 4;
_3 = c_11(D) + _2;
v_12 = *_3;
_21 = a_15(D) + _2;
_ifc__41 = *_21;
_ifc__42 = x_13(D);
_ifc__43 = v_12 == 20 ? _ifc__42 : _ifc__41;
*_21 = _ifc__43;
_ifc__44 = *_21;
_ifc__45 = y_14(D);
_ifc__46 = v_12 == 20 ? _ifc__44 : _ifc__45;
*_21 = _ifc__46;
iftmp.1_8 = v_12 != 20 ? x_13(D) : y_14(D);
_5 = b_17(D) + _2;
*_5 = iftmp.1_8;
Note the two extra loads from a[i] (_21), which didn't occur in the original
source. The handling of b[i] is fine.
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Subject: [Bug libstdc++/85632] std::filesystem::space or std::experimental::filesystem::space does not return correct information
Date: Thu, 03 May 2018 19:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85632
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May 3 19:53:42 2018
New Revision: 259906
URL: https://gcc.gnu.org/viewcvs?rev=259906&root=gcc&view=rev
Log:
PR libstdc++/85632 fix wraparound in filesystem::space
On 32-bit targets any values over 4GB would wrap and produce the wrong
result.
PR libstdc++/85632 use uintmax_t for arithmetic
* src/filesystem/ops.cc (experimental::filesystem::space): Perform
arithmetic in result type.
* src/filesystem/std-ops.cc (filesystem::space): Likewise.
* testsuite/27_io/filesystem/operations/space.cc: Check total capacity
is greater than free space.
* testsuite/experimental/filesystem/operations/space.cc: New.
Added:
branches/gcc-8-branch/libstdc++-v3/testsuite/experimental/filesystem/operations/space.cc
- copied, changed from r259898,
branches/gcc-8-branch/libstdc++-v3/testsuite/27_io/filesystem/operations/space.cc
Modified:
branches/gcc-8-branch/libstdc++-v3/ChangeLog
branches/gcc-8-branch/libstdc++-v3/src/filesystem/ops.cc
branches/gcc-8-branch/libstdc++-v3/src/filesystem/std-ops.cc
branches/gcc-8-branch/libstdc++-v3/testsuite/27_io/filesystem/operations/space.cc
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Subject: [Bug libstdc++/84769] variant::get(): unscoped call to get<size_t>
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--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May 3 19:53:46 2018
New Revision: 259907
URL: https://gcc.gnu.org/viewcvs?rev=259907&root=gcc&view=rev
Log:
PR libstdc++/84769 qualify call to std::get<0>
PR libstdc++/84769
* include/std/variant (visit): Qualify std::get call.
Modified:
branches/gcc-8-branch/libstdc++-v3/ChangeLog
branches/gcc-8-branch/libstdc++-v3/include/std/variant
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Subject: [Bug c++/85637] New: Unneeded store of member variables in inner loop
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85637
Bug ID: 85637
Summary: Unneeded store of member variables in inner loop
Product: gcc
Version: 7.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: petschy at gmail dot com
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Created attachment 44058
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44058&action=edit
source
Attached a simple Adler32 checksum class. When updating with an array of bytes,
the inner loop just accumulates the two sums, then the modulo is done in the
outer loop. This way the cost of the two modulos is amortized.
At the start the two member variables are loaded into registers, however, they
are stored back to memory in each inner loop iteration. Then, also at the end
after the modulo, but before the end of the outer loop. There is only one exit
from the function.
Why not store the registers back just once right before the ret?
Dump of assembler code for function Adler32::Update(void const*, unsigned int):
0x0000000000400500 <+0>: test %edx,%edx
0x0000000000400502 <+2>: je 0x400578 <Adler32::Update(void const*,
unsigned int)+120>
0x0000000000400504 <+4>: mov (%rdi),%ecx ; ecx is m_s1
0x0000000000400506 <+6>: mov 0x4(%rdi),%r8d ; r8d is m_s2
0x000000000040050a <+10>: mov $0x80078071,%r10d
0x0000000000400510 <+16>: xor %r9d,%r9d
0x0000000000400513 <+19>: cmp $0x15af,%edx
0x0000000000400519 <+25>: jbe 0x400527 <Adler32::Update(void const*,
unsigned int)+39>
0x000000000040051b <+27>: lea -0x15b0(%rdx),%r9d
0x0000000000400522 <+34>: mov $0x15b0,%edx
0x0000000000400527 <+39>: lea -0x1(%rdx),%eax
0x000000000040052a <+42>: lea 0x1(%rsi,%rax,1),%rdx
0x000000000040052f <+47>: nop
0x0000000000400530 <+48>: add $0x1,%rsi
0x0000000000400534 <+52>: movzbl -0x1(%rsi),%eax
0x0000000000400538 <+56>: add %eax,%ecx ; m_s1 += *buf
0x000000000040053a <+58>: add %ecx,%r8d ; m_s2 += m_s1
0x000000000040053d <+61>: cmp %rdx,%rsi
0x0000000000400540 <+64>: mov %ecx,(%rdi) ; !!! unneeded store
0x0000000000400542 <+66>: mov %r8d,0x4(%rdi) ; !!! ditto
0x0000000000400546 <+70>: jne 0x400530 <Adler32::Update(void const*,
unsigned int)+48>
0x0000000000400548 <+72>: mov %ecx,%eax
0x000000000040054a <+74>: mul %r10d
0x000000000040054d <+77>: mov %r8d,%eax
0x0000000000400550 <+80>: shr $0xf,%edx
0x0000000000400553 <+83>: imul $0xfff1,%edx,%edx
0x0000000000400559 <+89>: sub %edx,%ecx
0x000000000040055b <+91>: mul %r10d
0x000000000040055e <+94>: mov %ecx,(%rdi) ; !!! this could be
done after the jne at +118
0x0000000000400560 <+96>: shr $0xf,%edx
0x0000000000400563 <+99>: imul $0xfff1,%edx,%edx
0x0000000000400569 <+105>: sub %edx,%r8d
0x000000000040056c <+108>: test %r9d,%r9d
0x000000000040056f <+111>: mov %r9d,%edx
0x0000000000400572 <+114>: mov %r8d,0x4(%rdi) ; !!! ditto
0x0000000000400576 <+118>: jne 0x400510 <Adler32::Update(void const*,
unsigned int)+16>
0x0000000000400578 <+120>: repz retq
The above code is generated w/ 7.3.1, 6.3.1 generates the exact same code.
8.0.1 and 8.1.1 generates somewhat different code, longer by 32 bytes, but the
placing of the stores are the same. The size difference is odd, but I'll open
another bug for that.
Platform: AMD64 (FX-8150), Debian 9.4
$ g++-6.3.1 -v
Using built-in specs.
COLLECT_GCC=g++-6.3.1
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/6.3.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --enable-languages=c,c++ --disable-multilib
--program-suffix=-6.3.1 --disable-bootstrap --enable-checking=release
CFLAGS='-O2 -march=native' CXXFLAGS='-O2 -march=native'
Thread model: posix
gcc version 6.3.1 20170120 (GCC)
$ g++-7.3.1 -v
Using built-in specs.
COLLECT_GCC=g++-7.3.1
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/7.3.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --enable-languages=c,c++ --disable-multilib
--program-suffix=-7.3.1 --disable-bootstrap CFLAGS='-O2 -march=native
-mtune=native' CXXFLAGS='-O2 -march=native -mtune=native'
Thread model: posix
gcc version 7.3.1 20180429 (GCC)
$ g++-8.0.1 -v
Using built-in specs.
COLLECT_GCC=g++-8.0.1
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/8.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --enable-languages=c,c++ --disable-multilib
--program-suffix=-8.0.1 --disable-bootstrap CFLAGS='-O2 -march=native'
CXXFLAGS='-O2 -march=native'
Thread model: posix
gcc version 8.0.1 20180214 (experimental) (GCC)
$ g++-8.1.1 -v
Using built-in specs.
COLLECT_GCC=g++-8.1.1
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/8.1.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --enable-languages=c,c++ --disable-multilib
--program-suffix=-8.1.1 --disable-bootstrap CFLAGS='-O2 -march=native
-mtune=native' CXXFLAGS='-O2 -march=native -mtune=native'
Thread model: posix
gcc version 8.1.1 20180502 (GCC)
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Subject: [Bug middle-end/85637] Unneeded store of member variables in inner loop
Date: Thu, 03 May 2018 20:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85637
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is most likely because unsigned char is considered as aliasing any type.
That means the write to this->m_s1 and this->m_s2 can be read via *buf
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Subject: [Bug libstdc++/85632] std::filesystem::space or std::experimental::filesystem::space does not return correct information
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May 3 20:16:29 2018
New Revision: 259909
URL: https://gcc.gnu.org/viewcvs?rev=259909&root=gcc&view=rev
Log:
PR libstdc++/85632 fix wraparound in filesystem::space
On 32-bit targets any values over 4GB would wrap and produce the wrong
result.
PR libstdc++/85632 use uintmax_t for arithmetic
* src/filesystem/ops.cc (experimental::filesystem::space): Perform
arithmetic in result type.
* testsuite/experimental/filesystem/operations/space.cc: New.
Added:
branches/gcc-7-branch/libstdc++-v3/testsuite/experimental/filesystem/operations/space.cc
Modified:
branches/gcc-7-branch/libstdc++-v3/ChangeLog
branches/gcc-7-branch/libstdc++-v3/src/filesystem/ops.cc
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Subject: [Bug libstdc++/84769] variant::get(): unscoped call to get<size_t>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84769
--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May 3 20:16:34 2018
New Revision: 259910
URL: https://gcc.gnu.org/viewcvs?rev=259910&root=gcc&view=rev
Log:
PR libstdc++/84769 qualify call to std::get<0>
PR libstdc++/84769
* include/std/variant (visit): Qualify std::get call.
Modified:
branches/gcc-7-branch/libstdc++-v3/ChangeLog
branches/gcc-7-branch/libstdc++-v3/include/std/variant
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on all branches, thanks again.
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Subject: [Bug ada/85638] New: gcc 8.1.0 fails to build ada language for target i686-w64-mingw32
Date: Thu, 03 May 2018 20:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85638
Bug ID: 85638
Summary: gcc 8.1.0 fails to build ada language for target
i686-w64-mingw32
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
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Created attachment 44059
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44059&action=edit
error log
Summary
=======
Archlinux, x86_64, trying to compile mingw-w64-gcc 8.1.0:
+===========================GNAT BUG DETECTED==============================+
| 8.1.0 (i686-w64-mingw32) GCC error: |
| in find_rarely_executed_basic_blocks_and_crossing_edges, at |
| bb-reorder.c:1673 |
| Error detected around a-calend.adb:801:11 |
See error.log for more details
Build goes through if I disable ada.
Binutils is 2.30, mingw crt/winpthreads 5.0.3, installed mingw-w64-gcc is 7.3.0
Compilation options
===================
configure --prefix=/usr --libexecdir=/usr/lib \
--target=i686-w64-mingw32 \
--enable-languages=c,lto,c++,objc,obj-c++,fortran,ada \
--enable-shared --enable-static \
--enable-threads=posix --enable-fully-dynamic-string
--enable-libstdcxx-time=yes \
--with-system-zlib --enable-cloog-backend=isl \
--enable-lto --disable-dw2-exceptions --enable-libgomp \
--disable-multilib --enable-checking=release
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--- Comment #1 from xantares09 at hotmail dot com ---
Created attachment 44060
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??
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From: "xantares09 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ada/85638] gcc 8.1.0 fails to build ada language for target i686-w64-mingw32
Date: Thu, 03 May 2018 20:25:00 -0000
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--- Comment #2 from xantares09 at hotmail dot com ---
Created attachment 44061
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44061&action=edit
./src/gcc-build-i686-w64-mingw32/gcc/ada/rts/a-calend.adb
>From gcc-bugs-return-603622-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 20:34:37 2018
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From: "duarte at scylladb dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/84769] variant::get(): unscoped call to get<size_t>
Date: Thu, 03 May 2018 20:34:00 -0000
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--- Comment #13 from Duarte <duarte at scylladb dot com> ---
Awesome, thank you!
>From gcc-bugs-return-603623-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 20:36:06 2018
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Subject: [Bug target/55307] libgcc's __cpu_indicator_init does not check for avx correctly
Date: Thu, 03 May 2018 20:36:00 -0000
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Nathaniel J. Smith <njs at pobox dot com> changed:
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--- Comment #5 from Nathaniel J. Smith <njs at pobox dot com> ---
This was fixed in #85100.
>From gcc-bugs-return-603624-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 20:40:07 2018
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Subject: [Bug libstdc++/85632] std::filesystem::space or std::experimental::filesystem::space does not return correct information
Date: Thu, 03 May 2018 20:40:00 -0000
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May 3 20:39:31 2018
New Revision: 259911
URL: https://gcc.gnu.org/viewcvs?rev=259911&root=gcc&view=rev
Log:
PR libstdc++/85632 fix wraparound in filesystem::space
On 32-bit targets any values over 4GB would wrap and produce the wrong
result.
PR libstdc++/85632 use uintmax_t for arithmetic
* src/filesystem/ops.cc (experimental::filesystem::space): Perform
arithmetic in result type.
* testsuite/experimental/filesystem/operations/space.cc: New.
Added:
branches/gcc-6-branch/libstdc++-v3/testsuite/experimental/filesystem/operations/space.cc
Modified:
branches/gcc-6-branch/libstdc++-v3/ChangeLog
branches/gcc-6-branch/libstdc++-v3/src/filesystem/ops.cc
>From gcc-bugs-return-603626-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 20:41:42 2018
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Subject: [Bug c++/85600] [9 Regression] CPU2006 471.omnetpp fails starting with r259771
Date: Thu, 03 May 2018 20:41:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
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>From gcc-bugs-return-603625-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 20:41:06 2018
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Subject: [Bug libstdc++/85632] std::filesystem::space or std::experimental::filesystem::space does not return correct information
Date: Thu, 03 May 2018 20:41:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |6.5
Known to fail| |6.4.0, 7.3.0, 8.1.0
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on all active branches, thanks for the report.
>From gcc-bugs-return-603627-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 21:04:23 2018
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Subject: [Bug c++/80947] [6/7 Regression] Different visibility for the lambda and its capture list members with -fvisibility=hidden
Date: Thu, 03 May 2018 21:04:00 -0000
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--- Comment #17 from Duarte <duarte at scylladb dot com> ---
It also fails on GCC 8.1. This is the reproducer:
template<typename T>
void foo() {
struct inner {
inner() {
([this] { });
}
};
}
int main() { foo<int>(); }
It fails when compiled with -fvisibility=hidden, but succeeds with
-fvisibility=default.
It also compiles fine without the template.
>From gcc-bugs-return-603628-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 21:10:08 2018
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From: "seurer at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgomp/85639] New: ICE in compiling new test cases added in r259850
Date: Thu, 03 May 2018 21:10:00 -0000
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Bug ID: 85639
Summary: ICE in compiling new test cases added in r259850
Product: gcc
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CC: jakub at gcc dot gnu.org
Target Milestone: ---
> FAIL: c-c++-common/goacc/builtin-goacc-parlevel-id-size.c -std=c++11 (internal compiler error)
> FAIL: c-c++-common/goacc/builtin-goacc-parlevel-id-size.c -std=c++11 (test for excess errors)
> FAIL: c-c++-common/goacc/builtin-goacc-parlevel-id-size.c -std=c++14 (internal compiler error)
> FAIL: c-c++-common/goacc/builtin-goacc-parlevel-id-size.c -std=c++14 (test for excess errors)
> FAIL: c-c++-common/goacc/builtin-goacc-parlevel-id-size.c -std=c++98 (internal compiler error)
> FAIL: c-c++-common/goacc/builtin-goacc-parlevel-id-size.c -std=c++98 (test for excess errors)
> FAIL: c-c++-common/goacc/builtin-goacc-parlevel-id-size.c (internal compiler error)
> FAIL: c-c++-common/goacc/builtin-goacc-parlevel-id-size.c (test for excess errors)
> FAIL: libgomp.oacc-c++/../libgomp.oacc-c-c++-common/loop-auto-1.c -DACC_DEVICE_TYPE_host=1 -DACC_MEM_SHARED=1 -O2 (internal compiler error)
> FAIL: libgomp.oacc-c++/../libgomp.oacc-c-c++-common/loop-auto-1.c -DACC_DEVICE_TYPE_host=1 -DACC_MEM_SHARED=1 -O2 (test for excess errors)
> FAIL: libgomp.oacc-c/../libgomp.oacc-c-c++-common/loop-auto-1.c -DACC_DEVICE_TYPE_host=1 -DACC_MEM_SHARED=1 -O2 (internal compiler error)
> FAIL: libgomp.oacc-c/../libgomp.oacc-c-c++-common/loop-auto-1.c -DACC_DEVICE_TYPE_host=1 -DACC_MEM_SHARED=1 -O2 (test for excess errors)
Executing on host: /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-c/../libgomp.oacc-c-c++-common/loop-auto-1.c
-B/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/./libgomp/
-B/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/./libgomp/.libs
-I/home/seurer/gcc/build/gcc-trunk/powerpc64-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
-DACC_DEVICE_TYPE_host=1 -DACC_MEM_SHARED=1 -O2 -fopenacc-dim=32
-L/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/./libgomp/.libs
-lm -o ./loop-auto-1.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/libgomp/testsuite/libgomp.oacc-c/../libgomp.oacc-c-c++-common/loop-auto-1.c
-B/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/./libgomp/
-B/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/./libgomp/.libs
-I/home/seurer/gcc/build/gcc-trunk/powerpc64-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
-DACC_DEVICE_TYPE_host=1 -DACC_MEM_SHARED=1 -O2 -fopenacc-dim=32
-L/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/./libgomp/.libs
-lm -o ./loop-auto-1.exe
during RTL pass: expand
/home/seurer/gcc/gcc-trunk/libgomp/testsuite/libgomp.oacc-c/../libgomp.oacc-c-c++-common/loop-auto-1.c:
In function 'place':
/home/seurer/gcc/gcc-trunk/libgomp/testsuite/libgomp.oacc-c/../libgomp.oacc-c-c++-common/loop-auto-1.c:80:7:
internal compiler error: Segmentation fault
0x109992cb crash_signal
/home/seurer/gcc/gcc-trunk/gcc/toplev.c:325
0x10561c54 emit_move_insn(rtx_def*, rtx_def*)
/home/seurer/gcc/gcc-trunk/gcc/expr.c:3719
0x103990eb expand_builtin_goacc_parlevel_id_size
/home/seurer/gcc/gcc-trunk/gcc/builtins.c:6687
0x103b745f expand_builtin(tree_node*, rtx_def*, rtx_def*, machine_mode, int)
/home/seurer/gcc/gcc-trunk/gcc/builtins.c:7830
0x1055cb6b expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
/home/seurer/gcc/gcc-trunk/gcc/expr.c:11008
0x105741e3 expand_expr
/home/seurer/gcc/gcc-trunk/gcc/expr.h:280
0x105741e3 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
/home/seurer/gcc/gcc-trunk/gcc/expr.c:8482
0x1055bb03 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
/home/seurer/gcc/gcc-trunk/gcc/expr.c:11295
0x1056b173 expand_expr
/home/seurer/gcc/gcc-trunk/gcc/expr.h:280
0x1056b173 store_expr_with_bounds(tree_node*, rtx_def*, int, bool, bool,
tree_node*)
/home/seurer/gcc/gcc-trunk/gcc/expr.c:5546
0x1056d29f expand_assignment(tree_node*, tree_node*, bool)
/home/seurer/gcc/gcc-trunk/gcc/expr.c:5406
0x103e432f expand_call_stmt
/home/seurer/gcc/gcc-trunk/gcc/cfgexpand.c:2688
0x103e432f expand_gimple_stmt_1
/home/seurer/gcc/gcc-trunk/gcc/cfgexpand.c:3624
0x103e432f expand_gimple_stmt
/home/seurer/gcc/gcc-trunk/gcc/cfgexpand.c:3790
0x103eaf07 expand_gimple_basic_block
/home/seurer/gcc/gcc-trunk/gcc/cfgexpand.c:5819
0x103ee187 execute
/home/seurer/gcc/gcc-trunk/gcc/cfgexpand.c:6425
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.
compiler exited with status 1
>From gcc-bugs-return-603629-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 21:21:34 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85640] New: Code size regression vs 7.3.1
Date: Thu, 03 May 2018 21:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85640
Bug ID: 85640
Summary: Code size regression vs 7.3.1
Product: gcc
Version: 8.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: petschy at gmail dot com
Target Milestone: ---
Created attachment 44062
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44062&action=edit
source
Attached the source of a simple Adler32 checksum class. The Update() fn is 32
bytes longer compared to the code generated with 7.3.1.
Dump of assembler code for function Adler32::Update(void const*, unsigned int):
7.3.1 0x0000000000400500 <+0>: test %edx,%edx
7.3.1 0x0000000000400502 <+2>: je 0x400578 <Adler32::Update(void
const*, unsigned int)+120>
7.3.1 0x0000000000400504 <+4>: mov (%rdi),%ecx
7.3.1 0x0000000000400506 <+6>: mov 0x4(%rdi),%r8d
7.3.1 0x000000000040050a <+10>: mov $0x80078071,%r10d
7.3.1 0x0000000000400510 <+16>: xor %r9d,%r9d
7.3.1 0x0000000000400513 <+19>: cmp $0x15af,%edx
7.3.1 0x0000000000400519 <+25>: jbe 0x400527 <Adler32::Update(void
const*, unsigned int)+39>
7.3.1 0x000000000040051b <+27>: lea -0x15b0(%rdx),%r9d
7.3.1 0x0000000000400522 <+34>: mov $0x15b0,%edx
7.3.1 0x0000000000400527 <+39>: lea -0x1(%rdx),%eax
7.3.1 0x000000000040052a <+42>: lea 0x1(%rsi,%rax,1),%rdx
7.3.1 0x000000000040052f <+47>: nop
7.3.1 0x0000000000400530 <+48>: add $0x1,%rsi
7.3.1 0x0000000000400534 <+52>: movzbl -0x1(%rsi),%eax
7.3.1 0x0000000000400538 <+56>: add %eax,%ecx
7.3.1 0x000000000040053a <+58>: add %ecx,%r8d
7.3.1 0x000000000040053d <+61>: cmp %rdx,%rsi
7.3.1 0x0000000000400540 <+64>: mov %ecx,(%rdi)
7.3.1 0x0000000000400542 <+66>: mov %r8d,0x4(%rdi)
7.3.1 0x0000000000400546 <+70>: jne 0x400530 <Adler32::Update(void
const*, unsigned int)+48>
7.3.1 0x0000000000400548 <+72>: mov %ecx,%eax
7.3.1 0x000000000040054a <+74>: mul %r10d
7.3.1 0x000000000040054d <+77>: mov %r8d,%eax
7.3.1 0x0000000000400550 <+80>: shr $0xf,%edx
7.3.1 0x0000000000400553 <+83>: imul $0xfff1,%edx,%edx
7.3.1 0x0000000000400559 <+89>: sub %edx,%ecx
7.3.1 0x000000000040055b <+91>: mul %r10d
7.3.1 0x000000000040055e <+94>: mov %ecx,(%rdi)
7.3.1 0x0000000000400560 <+96>: shr $0xf,%edx
7.3.1 0x0000000000400563 <+99>: imul $0xfff1,%edx,%edx
7.3.1 0x0000000000400569 <+105>: sub %edx,%r8d
7.3.1 0x000000000040056c <+108>: test %r9d,%r9d
7.3.1 0x000000000040056f <+111>: mov %r9d,%edx
7.3.1 0x0000000000400572 <+114>: mov %r8d,0x4(%rdi)
7.3.1 0x0000000000400576 <+118>: jne 0x400510 <Adler32::Update(void
const*, unsigned int)+16>
7.3.1 0x0000000000400578 <+120>: repz retq
Dump of assembler code for function Adler32::Update(void const*, unsigned int):
8.1.1 0x0000000000400500 <+0>: test %edx,%edx
8.1.1 0x0000000000400502 <+2>: je 0x400598 <Adler32::Update(void
const*, unsigned int)+152>
8.1.1 0x0000000000400508 <+8>: mov (%rdi),%ecx
8.1.1 0x000000000040050a <+10>: mov 0x4(%rdi),%r8d
8.1.1 0x000000000040050e <+14>: push %rbx
8.1.1 0x000000000040050f <+15>: mov $0x80078071,%ebx
8.1.1 0x0000000000400514 <+20>: nopl 0x0(%rax)
8.1.1 0x0000000000400518 <+24>: xor %r11d,%r11d
8.1.1 0x000000000040051b <+27>: cmp $0x15af,%edx
8.1.1 0x0000000000400521 <+33>: jbe 0x40052f <Adler32::Update(void
const*, unsigned int)+47>
8.1.1 0x0000000000400523 <+35>: lea -0x15b0(%rdx),%r11d
8.1.1 0x000000000040052a <+42>: mov $0x15b0,%edx
8.1.1 0x000000000040052f <+47>: mov %edx,%r10d
8.1.1 0x0000000000400532 <+50>: mov %rsi,%rax
8.1.1 0x0000000000400535 <+53>: add %rsi,%r10
8.1.1 0x0000000000400538 <+56>: nopl 0x0(%rax,%rax,1)
8.1.1 0x0000000000400540 <+64>: add $0x1,%rax
8.1.1 0x0000000000400544 <+68>: movzbl -0x1(%rax),%r9d
8.1.1 0x0000000000400549 <+73>: add %r9d,%ecx
8.1.1 0x000000000040054c <+76>: add %ecx,%r8d
8.1.1 0x000000000040054f <+79>: mov %ecx,(%rdi)
8.1.1 0x0000000000400551 <+81>: mov %r8d,0x4(%rdi)
8.1.1 0x0000000000400555 <+85>: cmp %r10,%rax
8.1.1 0x0000000000400558 <+88>: jne 0x400540 <Adler32::Update(void
const*, unsigned int)+64>
8.1.1 0x000000000040055a <+90>: lea -0x1(%rdx),%eax
8.1.1 0x000000000040055d <+93>: lea 0x1(%rsi,%rax,1),%rsi
8.1.1 0x0000000000400562 <+98>: mov %ecx,%eax
8.1.1 0x0000000000400564 <+100>: mul %ebx
8.1.1 0x0000000000400566 <+102>: mov %r8d,%eax
8.1.1 0x0000000000400569 <+105>: shr $0xf,%edx
8.1.1 0x000000000040056c <+108>: imul $0xfff1,%edx,%edx
8.1.1 0x0000000000400572 <+114>: sub %edx,%ecx
8.1.1 0x0000000000400574 <+116>: mul %ebx
8.1.1 0x0000000000400576 <+118>: mov %ecx,(%rdi)
8.1.1 0x0000000000400578 <+120>: shr $0xf,%edx
8.1.1 0x000000000040057b <+123>: imul $0xfff1,%edx,%edx
8.1.1 0x0000000000400581 <+129>: sub %edx,%r8d
8.1.1 0x0000000000400584 <+132>: mov %r11d,%edx
8.1.1 0x0000000000400587 <+135>: mov %r8d,0x4(%rdi)
8.1.1 0x000000000040058b <+139>: test %r11d,%r11d
8.1.1 0x000000000040058e <+142>: jne 0x400518 <Adler32::Update(void
const*, unsigned int)+24>
8.1.1 0x0000000000400590 <+144>: pop %rbx
8.1.1 0x0000000000400591 <+145>: retq
8.1.1 0x0000000000400592 <+146>: nopw 0x0(%rax,%rax,1)
8.1.1 0x0000000000400598 <+152>: retq
Here is an interwoven version, hopefully easier to follow:
7.3.1 0x0000000000400500 <+0>: test %edx,%edx
7.3.1 0x0000000000400502 <+2>: je 0x400578 <Adler32::Update(void
const*, unsigned int)+120>
7.3.1 0x0000000000400504 <+4>: mov (%rdi),%ecx
7.3.1 0x0000000000400506 <+6>: mov 0x4(%rdi),%r8d
7.3.1 0x000000000040050a <+10>: mov $0x80078071,%r10d
8.1.1 0x0000000000400500 <+0>: test %edx,%edx
8.1.1 0x0000000000400502 <+2>: je 0x400598 <Adler32::Update(void
const*, unsigned int)+152>
8.1.1 0x0000000000400508 <+8>: mov (%rdi),%ecx
8.1.1 0x000000000040050a <+10>: mov 0x4(%rdi),%r8d
8.1.1 0x000000000040050e <+14>: push %rbx
8.1.1 0x000000000040050f <+15>: mov $0x80078071,%ebx
8.1.1 0x0000000000400514 <+20>: nopl 0x0(%rax)
Two things so far:
- the je is 6 bytes in 8.1.1 vs 2 bytes in 7.3.1 because the jump offset can't
fit in a byte
- in 8.1.1 ebx is used for the modulo magic, which is callee saved, so have to
push before use
7.3.1 0x0000000000400510 <+16>: xor %r9d,%r9d
7.3.1 0x0000000000400513 <+19>: cmp $0x15af,%edx
7.3.1 0x0000000000400519 <+25>: jbe 0x400527 <Adler32::Update(void
const*, unsigned int)+39>
7.3.1 0x000000000040051b <+27>: lea -0x15b0(%rdx),%r9d
7.3.1 0x0000000000400522 <+34>: mov $0x15b0,%edx
7.3.1 0x0000000000400527 <+39>: lea -0x1(%rdx),%eax
7.3.1 0x000000000040052a <+42>: lea 0x1(%rsi,%rax,1),%rdx
7.3.1 0x000000000040052f <+47>: nop
8.1.1 0x0000000000400518 <+24>: xor %r11d,%r11d
8.1.1 0x000000000040051b <+27>: cmp $0x15af,%edx
8.1.1 0x0000000000400521 <+33>: jbe 0x40052f <Adler32::Update(void
const*, unsigned int)+47>
8.1.1 0x0000000000400523 <+35>: lea -0x15b0(%rdx),%r11d
8.1.1 0x000000000040052a <+42>: mov $0x15b0,%edx
8.1.1 0x000000000040052f <+47>: mov %edx,%r10d
8.1.1 0x0000000000400532 <+50>: mov %rsi,%rax
8.1.1 0x0000000000400535 <+53>: add %rsi,%r10
8.1.1 0x0000000000400538 <+56>: nopl 0x0(%rax,%rax,1)
This is the inner loop init, pretty similar.
7.3.1 0x0000000000400530 <+48>: add $0x1,%rsi
7.3.1 0x0000000000400534 <+52>: movzbl -0x1(%rsi),%eax
7.3.1 0x0000000000400538 <+56>: add %eax,%ecx
7.3.1 0x000000000040053a <+58>: add %ecx,%r8d
7.3.1 0x000000000040053d <+61>: cmp %rdx,%rsi
7.3.1 0x0000000000400540 <+64>: mov %ecx,(%rdi)
7.3.1 0x0000000000400542 <+66>: mov %r8d,0x4(%rdi)
7.3.1 0x0000000000400546 <+70>: jne 0x400530 <Adler32::Update(void
const*, unsigned int)+48>
8.1.1 0x0000000000400540 <+64>: add $0x1,%rax
8.1.1 0x0000000000400544 <+68>: movzbl -0x1(%rax),%r9d
8.1.1 0x0000000000400549 <+73>: add %r9d,%ecx
8.1.1 0x000000000040054c <+76>: add %ecx,%r8d
8.1.1 0x000000000040054f <+79>: mov %ecx,(%rdi)
8.1.1 0x0000000000400551 <+81>: mov %r8d,0x4(%rdi)
8.1.1 0x0000000000400555 <+85>: cmp %r10,%rax
8.1.1 0x0000000000400558 <+88>: jne 0x400540 <Adler32::Update(void
const*, unsigned int)+64>
These are the same, except the cmp is before/after the two stores, and the
movzbl and the first add is one byte cheaper in 7.3.1.
7.3.1 0x0000000000400548 <+72>: mov %ecx,%eax
7.3.1 0x000000000040054a <+74>: mul %r10d
7.3.1 0x000000000040054d <+77>: mov %r8d,%eax
7.3.1 0x0000000000400550 <+80>: shr $0xf,%edx
7.3.1 0x0000000000400553 <+83>: imul $0xfff1,%edx,%edx
7.3.1 0x0000000000400559 <+89>: sub %edx,%ecx
7.3.1 0x000000000040055b <+91>: mul %r10d
7.3.1 0x000000000040055e <+94>: mov %ecx,(%rdi)
7.3.1 0x0000000000400560 <+96>: shr $0xf,%edx
7.3.1 0x0000000000400563 <+99>: imul $0xfff1,%edx,%edx
7.3.1 0x0000000000400569 <+105>: sub %edx,%r8d
7.3.1 0x000000000040056c <+108>: test %r9d,%r9d
7.3.1 0x000000000040056f <+111>: mov %r9d,%edx
7.3.1 0x0000000000400572 <+114>: mov %r8d,0x4(%rdi)
7.3.1 0x0000000000400576 <+118>: jne 0x400510 <Adler32::Update(void
const*, unsigned int)+16>
7.3.1 0x0000000000400578 <+120>: repz retq
8.1.1 0x000000000040055a <+90>: lea -0x1(%rdx),%eax
8.1.1 0x000000000040055d <+93>: lea 0x1(%rsi,%rax,1),%rsi
8.1.1 0x0000000000400562 <+98>: mov %ecx,%eax
8.1.1 0x0000000000400564 <+100>: mul %ebx
8.1.1 0x0000000000400566 <+102>: mov %r8d,%eax
8.1.1 0x0000000000400569 <+105>: shr $0xf,%edx
8.1.1 0x000000000040056c <+108>: imul $0xfff1,%edx,%edx
8.1.1 0x0000000000400572 <+114>: sub %edx,%ecx
8.1.1 0x0000000000400574 <+116>: mul %ebx
8.1.1 0x0000000000400576 <+118>: mov %ecx,(%rdi)
8.1.1 0x0000000000400578 <+120>: shr $0xf,%edx
8.1.1 0x000000000040057b <+123>: imul $0xfff1,%edx,%edx
8.1.1 0x0000000000400581 <+129>: sub %edx,%r8d
8.1.1 0x0000000000400584 <+132>: mov %r11d,%edx
8.1.1 0x0000000000400587 <+135>: mov %r8d,0x4(%rdi)
8.1.1 0x000000000040058b <+139>: test %r11d,%r11d
8.1.1 0x000000000040058e <+142>: jne 0x400518 <Adler32::Update(void
const*, unsigned int)+24>
8.1.1 0x0000000000400590 <+144>: pop %rbx
8.1.1 0x0000000000400591 <+145>: retq
8.1.1 0x0000000000400592 <+146>: nopw 0x0(%rax,%rax,1)
8.1.1 0x0000000000400598 <+152>: retq
The loop variables in 8.1.1 handled a bit differently, that's why the minor
size increase. The two lea's here in the 8.1.1 version are very similar to the
ones before the inner loop in 7.3.1, those calculate the ptr range of the inner
loop. These lea's here calculate the start ptr for the next inner loop run,
however, this ptr is already present in eax. I don't know if this is some
special optimization, or eax should have been used but the compiler missed it.
The double retq at the end is interesting, but maybe the debug info is to
blame.
cmdline used to compile:
$ g++-7.3.1 -g -O3 -Wall a32.cpp
$ g++-8.1.1 -g -O3 -Wall a32.cpp
Platform is AMD64 (FX-8150), Debian 9.4
$ g++-7.3.1 -v
Using built-in specs.
COLLECT_GCC=g++-7.3.1
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/7.3.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --enable-languages=c,c++ --disable-multilib
--program-suffix=-7.3.1 --disable-bootstrap CFLAGS='-O2 -march=native
-mtune=native' CXXFLAGS='-O2 -march=native -mtune=native'
Thread model: posix
gcc version 7.3.1 20180429 (GCC)
$ g++-8.1.1 -v
Using built-in specs.
COLLECT_GCC=g++-8.1.1
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-pc-linux-gnu/8.1.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --enable-languages=c,c++ --disable-multilib
--program-suffix=-8.1.1 --disable-bootstrap CFLAGS='-O2 -march=native
-mtune=native' CXXFLAGS='-O2 -march=native -mtune=native'
Thread model: posix
gcc version 8.1.1 20180502 (GCC)
>From gcc-bugs-return-603630-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 21:36:47 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/85637] Unneeded store of member variables in inner loop
Date: Thu, 03 May 2018 21:36:00 -0000
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--- Comment #2 from petschy at gmail dot com ---
Thanks. For non-char types, one can use __restrict on ptrs, but for chars it
doesn't work, unfortunately (strict aliasing rules). Is there a way to tell the
compiler that a char ptr doesn't alias anything in the function? The current
behaviour pessimizes any code that does byte I/O with classes, if I understand
the rules correcly:
- for const char* it assumes that members might be read through the ptr, so it
stores them back after an update
- for char* it assumes that after a write, any members in registers must be
re-loaded as the write might have changed them.
>From gcc-bugs-return-603631-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 21:43:46 2018
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Subject: [Bug target/55307] libgcc's __cpu_indicator_init does not check for avx correctly
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--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
Dup.
>From gcc-bugs-return-603633-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 21:44:10 2018
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Subject: [Bug target/85100] __builtin_cpu_supports avx does not verify OS supports it
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CC| |luto at kernel dot org
--- Comment #13 from H.J. Lu <hjl.tools at gmail dot com> ---
*** Bug 55307 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-603632-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 21:44:10 2018
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--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
Dup.
*** This bug has been marked as a duplicate of bug 85100 ***
>From gcc-bugs-return-603634-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 21:57:44 2018
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From: "antony at cosmologist dot info" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85641] New: [7/8 Regression] ICE with string concatenate
Date: Thu, 03 May 2018 21:57:00 -0000
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Bug ID: 85641
Summary: [7/8 Regression] ICE with string concatenate
Product: gcc
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This worked for a long time in gcc 7, I think it broke in gcc 7.3 (not exactly
sure which minor version). It is also broken in gcc 8 and latest master:
gfortran -c test.f90
where test.f90 is
program tester
character(LEN=:), allocatable :: fields
integer j
character(LEN=4), parameter :: CMB_CL_Fields = 'TEBP'
fields = ''
j=1
fields = fields // CMB_CL_Fields(j:j)
end program tester
>From gcc-bugs-return-603635-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 22:07:43 2018
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From: "duarte at scylladb dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85642] New: Wrong implicit exception-specification with std::optional
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Bug ID: 85642
Summary: Wrong implicit exception-specification with
std::optional
Product: gcc
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Apologies if this has already been reported, but I couldn't find a matching
report.
Consider the following program:
#include <optional>
struct Y {
int i;
Y() noexcept = default;
Y(Y&&) noexcept = default;
};
class X final {
std::optional<Y> _permit;
X() noexcept = default;
public:
static X make() {
return X();
}
};
int main() {
X::make();
return 1;
}
It fails with the following error message on GCC 8.0.1 and GCC 8.1:
<source>: In static member function 'static X X::make()':
<source>:14:18: error: use of deleted function 'constexpr X::X()'
return X();
^
<source>:11:5: note: 'constexpr X::X() noexcept' is implicitly deleted because
its exception-specification does not match the implicit exception-specification
''
X() noexcept = default;
^
Compiler returned: 1
It compiles fine on GCC 7.3, which I believe is the correct result.
Godbolt: https://godbolt.org/g/Y2hCHZ
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Subject: [Bug libstdc++/82644] Non-standard hypergeometric special functions defined in strict modes
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May 3 22:58:43 2018
New Revision: 259912
URL: https://gcc.gnu.org/viewcvs?rev=259912&root=gcc&view=rev
Log:
PR libstdc++/82644 define TR1 hypergeometric functions in strict modes
Following a recent change for PR 82644 the non-standard hypergeomtric
functions are not defined by <cmath> when __STRICT_ANSI__ is defined
(e.g. for -std=c++17, or -std=c++14 -D__STDCPP_WANT_MATH_SPEC_FUNCS__).
That caused errors in <tr1/cmath> because the using-declarations for
tr1::hyperg et al are invalid in strict modes.
The solution is to define the TR1 hypergeometric functions inline in
<tr1/cmath> if __STRICT_ANSI__ is defined.
PR libstdc++/82644
* include/tr1/cmath [__STRICT_ANSI__] (hypergf, hypergl, hyperg): Use
inline definitions instead of using-declarations.
[__STRICT_ANSI__] (conf_hypergf, conf_hypergl, conf_hyperg): Likewise.
* testsuite/tr1/5_numerical_facilities/special_functions/
07_conf_hyperg/compile_cxx17.cc: New.
* testsuite/tr1/5_numerical_facilities/special_functions/
17_hyperg/compile_cxx17.cc: New.
Added:
trunk/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/07_conf_hyperg/compile_cxx17.cc
trunk/libstdc++-v3/testsuite/tr1/5_numerical_facilities/special_functions/17_hyperg/compile_cxx17.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/tr1/cmath
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Subject: [Bug tree-optimization/61502] == comparison on "one-past" pointer gives wrong result
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James Y Knight <foom at fuhm dot net> changed:
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--- Comment #24 from James Y Knight <foom at fuhm dot net> ---
FWIW, clang did consider this a bug and fixed it in
https://bugs.llvm.org/show_bug.cgi?id=21327.
>From gcc-bugs-return-603638-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 23:12:32 2018
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85641] [7/8 Regression] ICE with string concatenate
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2018-05-03
CC| |kargl at gcc dot gnu.org,
| |tkoenig at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from kargl at gcc dot gnu.org ---
This seems to be a problem in the gfc_code_walker() chain.
Note, even if I use -fno-frontend-optimize, I still hit the
problem. If try
gfcx -o z a.f90 -fno-frontend-optimize
and watch for an explosion in memory usage in top I see
last pid: 489; load averages: 0.13, 0.22, 0.18 up 16+00:00:59
16:07:16
68 processes: 1 running, 64 sleeping, 3 stopped
CPU: 0.5% user, 0.1% nice, 0.2% system, 0.0% interrupt, 99.1% idle
Mem: 3977M Active, 12G Inact, 695M Laundry, 2153M Wired, 830M Buf, 12G Free
Swap: 16G Total, 84M Used, 16G Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
484 sgk 1 40 0 3280M 3271M STOP 1 0:04 0.00% f951
487 sgk 1 40 0 340M 316M select 2 0:03 0.00% gdb81
suspending the compilation with ^Z and attaching gdb81 to PID 484 gives
#0 memset () at /usr/src/lib/libc/amd64/string/memset.S:51
#1 0x000000020307ae09 in tcache_alloc_small (arena=<optimized out>, size=0,
tsd=<optimized out>, tcache=<optimized out>, binind=<optimized out>,
zero=<optimized out>, slow_path=<optimized out>)
at /usr/src/contrib/jemalloc/include/jemalloc/internal/tcache_inlines.h:117
#2 arena_malloc (tsdn=<optimized out>, size=<optimized out>, zero=255,
tcache=<optimized out>, slow_path=false, arena=<optimized out>,
ind=<optimized out>)
at
/usr/src/contrib/jemalloc/include/jemalloc/internal/arena_inlines_b.h:101
#3 iallocztm (size=<optimized out>, zero=255, tcache=<optimized out>,
is_internal=false, slow_path=false, tsdn=<optimized out>,
ind=<optimized out>, arena=<optimized out>)
at
/usr/src/contrib/jemalloc/include/jemalloc/internal/jemalloc_internal_inlines_c.h:33
#4 imalloc_no_sample (tsd=<optimized out>, size=<optimized out>, usize=3072,
sopts=<optimized out>, dopts=<optimized out>, ind=<optimized out>)
at jemalloc_jemalloc.c:1654
#5 imalloc_body (tsd=<optimized out>, sopts=<optimized out>,
dopts=<optimized out>) at jemalloc_jemalloc.c:1850
#6 imalloc (sopts=<optimized out>, dopts=<optimized out>)
at jemalloc_jemalloc.c:1950
#7 __calloc (num=<optimized out>, num@entry=1, size=<optimized out>,
size@entry=2680) at jemalloc_jemalloc.c:2064
#8 0x000000000160ca11 in xcalloc (nelem=nelem@entry=1,
elsize=elsize@entry=2680) at ../../gcc/libiberty/xmalloc.c:162
#9 0x000000000080b57d in gfc_get_namespace (parent=parent@entry=0x203caf000,
parent_types=parent_types@entry=1) at ../../gcc/gcc/fortran/symbol.c:2824
#10 0x00000000007d1c93 in gfc_build_block_ns(gfc_namespace*) ()
at ../../gcc/gcc/fortran/parse.c:4429
#11 0x00000000008a884f in insert_block ()
at ../../gcc/gcc/fortran/frontend-passes.c:673
#12 0x00000000008a8cca in insert_block ()
at ../../gcc/gcc/fortran/frontend-passes.c:644
#13 create_var(gfc_expr*, char const*) ()
at ../../gcc/gcc/fortran/frontend-passes.c:728
#14 0x00000000008a9190 in realloc_string_callback (c=0x2ca244808,
walk_subtrees=<optimized out>, data=<optimized out>)
at ../../gcc/gcc/fortran/frontend-passes.c:291
#15 0x00000000008ad2ca in gfc_code_walker (c=0x2ca244808,
codefn=codefn@entry=0x8a90d0 <realloc_string_callback(gfc_code**, int*,
void *)>,
exprfn=exprfn@entry=0x8a6eb0 <dummy_expr_callback(gfc_expr**, int*,
void*)>, data=data@entry=0x0) at ../../gcc/gcc/fortran/frontend-passes.c:4569
#16 0x00000000008ad88d in gfc_code_walker (c=0x2ca243c08,
codefn=codefn@entry=0x8a90d0 <realloc_string_callback(gfc_code**, int*,
void*)>,
exprfn=exprfn@entry=0x8a6eb0 <dummy_expr_callback(gfc_expr**, int*,
void*)>, data=data@entry=0x0) at ../../gcc/gcc/fortran/frontend-passes.c:4593
#17 0x00000000008ad88d in gfc_code_walker (c=0x2ca243008,
codefn=codefn@entry=0x8a90d0 <realloc_string_callback(gfc_code**, int*,
void*)>,
exprfn=exprfn@entry=0x8a6eb0 <dummy_expr_callback(gfc_expr**, int*,
void*)>, data=data@entry=0x0) at ../../gcc/gcc/fortran/frontend-passes.c:4593
#18 0x00000000008ad88d in gfc_code_walker (c=0x2ca242408,
codefn=codefn@entry=0x8a90d0 <realloc_string_callback(gfc_code**, int*,
void
There are an additional 12 frames
#31 0x00000000008ad88d in gfc_code_walker (c=0x2ca231808,
codefn=codefn@entry=0x8a90d0 <realloc_string_callback(gfc_code**, int*,
void*)>,
exprfn=exprfn@entry=0x8a6eb0 <dummy_expr_callback(gfc_expr**, int*,
void*)>, data=data@entry=0x0) at ../../gcc/gcc/fortran/frontend-passes.c:4593
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From: "gufideg at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/83476] Template argument deduction fails with reference template parameter
Date: Thu, 03 May 2018 23:13:00 -0000
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Guillaume Racicot <gufideg at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Version|7.3.1 |8.1.0
Summary|Template argument deduction |Template argument deduction
|fails with reference auto |fails with reference
|template parameter |template parameter
--- Comment #1 from Guillaume Racicot <gufideg at gmail dot com> ---
Still happen with GCC 8.1. It also happen with normal reference template
parameter.
Here's a simplified test case:
template<int&> struct foo {};
template<int& t>
void deduce(foo<t>) {}
extern int bar;
int bar;
int main() {
deduce(foo<bar>{});
}
This example compiles in MSVC and Clang. https://godbolt.org/g/kxKkb5
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Subject: [Bug c++/85600] [9 Regression] CPU2006 471.omnetpp fails starting with r259771
Date: Thu, 03 May 2018 23:35:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #8 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug c++/85600] [9 Regression] CPU2006 471.omnetpp fails starting with r259771
Date: Thu, 03 May 2018 23:35:00 -0000
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--- Comment #9 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Thu May 3 23:35:20 2018
New Revision: 259913
URL: https://gcc.gnu.org/viewcvs?rev=259913&root=gcc&view=rev
Log:
PR c++/85600 - virtual delete failure.
* init.c (build_delete): Always save_expr when deleting.
Added:
trunk/gcc/testsuite/g++.dg/expr/delete2.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/init.c
>From gcc-bugs-return-603642-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu May 03 23:43:35 2018
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Subject: [Bug fortran/85641] [7/8 Regression] ICE with string concatenate
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--- Comment #2 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Thu, May 03, 2018 at 11:12:26PM +0000, kargl at gcc dot gnu.org wrote:
>
> #31 0x00000000008ad88d in gfc_code_walker (c=0x2ca231808,
> codefn=codefn@entry=0x8a90d0 <realloc_string_callback(gfc_code**, int*,
> void*)>,
> exprfn=exprfn@entry=0x8a6eb0 <dummy_expr_callback(gfc_expr**, int*,
> void*)>, data=data@entry=0x0) at ../../gcc/gcc/fortran/frontend-passes.c:4593
>
gfortran seems to be stuck in an infinite loop and slowly
swallowing memory.
(gdb) c
Continuing.
Breakpoint 1, gfc_code_walker (c=0x203dc5008,
codefn=codefn@entry=0x8a90d0 <realloc_string_callback(gfc_code**, int*,
void*)>,
exprfn=exprfn@entry=0x8a6eb0 <dummy_expr_callback(gfc_expr**, int*,
void*)>, data=data@entry=0x0) at ../../gcc/gcc/fortran/frontend-passes.c:4566
4566 for (; *c; c = &(*c)->next)
(gdb) c
Continuing.
Breakpoint 2, realloc_string_callback (c=0x203dc5008,
walk_subtrees=0x7fffffffd14c, data=0x0)
at ../../gcc/gcc/fortran/frontend-passes.c:248
248 if (co->op != EXEC_ASSIGN)
(gdb) list
4561
4562 int
4563 gfc_code_walker (gfc_code **c, walk_code_fn_t codefn, walk_expr_fn_t
exprfn,
4564 void *data)
4565 {
4566 for (; *c; c = &(*c)->next)
4567 {
4568 int walk_subtrees = 1;
4569 int result = codefn (c, &walk_subtrees, data);
4570 if (result)
:-(
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From: "romain.geissler at amadeus dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/78063] libbacktrace fails to handle cross CU DW_AT_abstract_origin
Date: Fri, 04 May 2018 00:22:00 -0000
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Romain Geissler <romain.geissler at amadeus dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |romain.geissler at amadeus dot com
--- Comment #2 from Romain Geissler <romain.geissler at amadeus dot com> ---
Hi,
As written in previous comments, this now breaks both libbacktrace tests + all
sanitizer tests using backtrace when using gcc >= 8 and an LTO bootstrapped
compiler.
Shall we XFAIL temporarily these tests in case of LTO bootstrap (if that is
even possible) ?
Here is a list of tests which are failing for me:
test1: [0]: missing file name or function name
FAIL: backtrace_full alloc stress
FAIL: edtest
test1: [0]: missing file name or function name
test1: [0]: missing file name or function name
test1: [0]: missing file name or function name
test1: [0]: missing file name or function name
test1: [0]: missing file name or function name
test1: [0]: missing file name or function name
test1: [0]: missing file name or function name
test1: [0]: missing file name or function name
test1: [0]: missing file name or function name
test1: [0]: missing file name or function name
FAIL: threaded backtrace_full noinline
FAIL: ttest
Cheers,
Romain
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Subject: [Bug middle-end/85643] New: attribute nonstring fails to squash -Wstringop-truncation warning
Date: Fri, 04 May 2018 00:23:00 -0000
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Bug ID: 85643
Summary: attribute nonstring fails to squash
-Wstringop-truncation warning
Product: gcc
Version: 8.0
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Created attachment 44063
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44063&action=edit
testcase
The attached testcase taken from binutils sources fails at -O2 -Wall -Werror
with
strncpy.i: In function ‘f3’:
strncpy.i:24:3: error: ‘__builtin_strncpy’ specified bound 60 equals
destination size [-Werror=stringop-truncation]
__builtin_strncpy (data + 20, name, 60);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
strncpy.i: In function ‘f4’:
strncpy.i:33:3: error: ‘__builtin_strncpy’ specified bound 60 equals
destination size [-Werror=stringop-truncation]
__builtin_strncpy (p, name, 60);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
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From: "shyouhei@ruby-lang.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85644] New: -fstack-protector generates invalid read to %fs:0x0 on mac
Date: Fri, 04 May 2018 00:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85644
Bug ID: 85644
Summary: -fstack-protector generates invalid read to %fs:0x0 on
mac
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: shyouhei@ruby-lang.org
Target Milestone: ---
When -fstack-protector is passed, gcc introduces problematic %fs:0x0 reference
in a function prelude.
% echo 'int main(void) { char c[8]; }' | gcc-trunk -v -fstack-protector -xc -
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/Users/urabe.shyouhei/target/libexec/gcc/x86_64-apple-darwin15.6.0/9.0.0/lto-wrapper
Target: x86_64-apple-darwin15.6.0
Configured with:
/Users/urabe.shyouhei/data/src/github.com/gcc-mirror/gcc/configure
--prefix=/Users/urabe.shyouhei/target --program-suffix=-trunk
--enable-languages=c --disable-bootstrap
--cache-file=/Users/urabe.shyouhei/data/build/gcc/config.cache
Thread model: posix
gcc version 9.0.0 20180503 (experimental) (GCC)
COLLECT_GCC_OPTIONS='-v' '-fstack-protector' '-mmacosx-version-min=10.11.0'
'-asm_macosx_version_min=10.11' '-mtune=core2'
/Users/urabe.shyouhei/target/libexec/gcc/x86_64-apple-darwin15.6.0/9.0.0/cc1
-quiet -v -D__DYNAMIC__ - -fPIC -quiet -dumpbase - -mmacosx-version-min=10.11.0
-mtune=core2 -auxbase - -version -fstack-protector -o
/var/folders/50/9ss08lxs5ml7kvz614tr3_wmm17741/T//ccO4in0z.s
GNU C17 (GCC) version 9.0.0 20180503 (experimental) (x86_64-apple-darwin15.6.0)
compiled by GNU C version 6.4.0, 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=30 --param ggc-min-heapsize=4096
ignoring nonexistent directory
"/Users/urabe.shyouhei/target/lib/gcc/x86_64-apple-darwin15.6.0/9.0.0/../../../../x86_64-apple-darwin15.6.0/include"
#include "..." search starts here:
#include <...> search starts here:
/Users/urabe.shyouhei/target/lib/gcc/x86_64-apple-darwin15.6.0/9.0.0/include
/usr/local/include
/Users/urabe.shyouhei/target/include
/Users/urabe.shyouhei/target/lib/gcc/x86_64-apple-darwin15.6.0/9.0.0/include-fixed
/usr/include
/System/Library/Frameworks
/Library/Frameworks
End of search list.
GNU C17 (GCC) version 9.0.0 20180503 (experimental) (x86_64-apple-darwin15.6.0)
compiled by GNU C version 6.4.0, 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=30 --param ggc-min-heapsize=4096
Compiler executable checksum: 48d8373f46962ba1e7a1ba1886f038d5
COLLECT_GCC_OPTIONS='-v' '-fstack-protector' '-mmacosx-version-min=10.11.0'
'-mtune=core2'
as -arch x86_64 -v -force_cpusubtype_ALL -mmacosx-version-min=10.11 -o
/var/folders/50/9ss08lxs5ml7kvz614tr3_wmm17741/T//cc2AB2b1.o
/var/folders/50/9ss08lxs5ml7kvz614tr3_wmm17741/T//ccO4in0z.s
Apple LLVM version 8.0.0 (clang-800.0.42.1)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"
-cc1as -triple x86_64-apple-macosx10.11.0 -filetype obj -main-file-name
ccO4in0z.s -target-cpu core2 -fdebug-compilation-dir
/Users/urabe.shyouhei/data/build/ruby@gcc-8/trunk@O0 -dwarf-debug-producer
Apple LLVM version 8.0.0 (clang-800.0.42.1) -dwarf-version=2 -mrelocation-model
pic -o /var/folders/50/9ss08lxs5ml7kvz614tr3_wmm17741/T//cc2AB2b1.o
/var/folders/50/9ss08lxs5ml7kvz614tr3_wmm17741/T//ccO4in0z.s
COMPILER_PATH=/Users/urabe.shyouhei/target/libexec/gcc/x86_64-apple-darwin15.6.0/9.0.0/:/Users/urabe.shyouhei/target/libexec/gcc/x86_64-apple-darwin15.6.0/9.0.0/:/Users/urabe.shyouhei/target/libexec/gcc/x86_64-apple-darwin15.6.0/:/Users/urabe.shyouhei/target/lib/gcc/x86_64-apple-darwin15.6.0/9.0.0/:/Users/urabe.shyouhei/target/lib/gcc/x86_64-apple-darwin15.6.0/
LIBRARY_PATH=/Users/urabe.shyouhei/target/lib/gcc/x86_64-apple-darwin15.6.0/9.0.0/:/Users/urabe.shyouhei/target/lib/gcc/x86_64-apple-darwin15.6.0/9.0.0/../../../
COLLECT_GCC_OPTIONS='-v' '-fstack-protector' '-mmacosx-version-min=10.11.0'
'-mtune=core2'
/Users/urabe.shyouhei/target/libexec/gcc/x86_64-apple-darwin15.6.0/9.0.0/collect2
-dynamic -arch x86_64 -macosx_version_min 10.11.0 -weak_reference_mismatches
non-weak -o a.out
-L/Users/urabe.shyouhei/target/lib/gcc/x86_64-apple-darwin15.6.0/9.0.0
-L/Users/urabe.shyouhei/target/lib/gcc/x86_64-apple-darwin15.6.0/9.0.0/../../..
/var/folders/50/9ss08lxs5ml7kvz614tr3_wmm17741/T//cc2AB2b1.o -no_compact_unwind
-lSystem -lgcc_ext.10.5 -lgcc -lSystem -v
collect2 version 9.0.0 20180503 (experimental)
/usr/bin/ld -dynamic -arch x86_64 -macosx_version_min 10.11.0
-weak_reference_mismatches non-weak -o a.out
-L/Users/urabe.shyouhei/target/lib/gcc/x86_64-apple-darwin15.6.0/9.0.0
-L/Users/urabe.shyouhei/target/lib/gcc/x86_64-apple-darwin15.6.0/9.0.0/../../..
/var/folders/50/9ss08lxs5ml7kvz614tr3_wmm17741/T//cc2AB2b1.o -no_compact_unwind
-lSystem -lgcc_ext.10.5 -lgcc -lSystem -v
@(#)PROGRAM:ld PROJECT:ld64-274.1
configured to support archs: armv6 armv7 armv7s arm64 i386 x86_64 x86_64h
armv6m armv7k armv7m armv7em (tvOS)
Library search paths:
/Users/urabe.shyouhei/target/lib/gcc/x86_64-apple-darwin15.6.0/9.0.0
/Users/urabe.shyouhei/target/lib
/usr/lib
/usr/local/lib
Framework search paths:
/Library/Frameworks/
/System/Library/Frameworks/
/usr/local/bin/gnm -n
/var/folders/50/9ss08lxs5ml7kvz614tr3_wmm17741/T//cc2AB2b1.o
%
%
% gobjdump -S ./a.out
./a.out: file format mach-o-x86-64
Disassembly of section .text:
0000000100000f5c <_main>:
100000f5c: 55 push %rbp
100000f5d: 48 89 e5 mov %rsp,%rbp
100000f60: 48 83 ec 10 sub $0x10,%rsp
100000f64: 64 48 8b 04 25 00 00 mov %fs:0x0,%rax
100000f6b: 00 00
100000f6d: 48 89 45 f8 mov %rax,-0x8(%rbp)
100000f71: 31 c0 xor %eax,%eax
100000f73: b8 00 00 00 00 mov $0x0,%eax
100000f78: 48 8b 55 f8 mov -0x8(%rbp),%rdx
100000f7c: 64 48 33 14 25 00 00 xor %fs:0x0,%rdx
100000f83: 00 00
100000f85: 74 05 je 100000f8c <_main+0x30>
100000f87: e8 02 00 00 00 callq 100000f8e <_main+0x32>
100000f8c: c9 leaveq
100000f8d: c3 retq
Disassembly of section __TEXT.__stubs:
0000000100000f8e <__TEXT.__stubs>:
100000f8e: ff 25 7c 00 00 00 jmpq *0x7c(%rip) # 100001010
<_main+0xb4>
Disassembly of section __TEXT.__stub_helper:
0000000100000f94 <__TEXT.__stub_helper>:
100000f94: 4c 8d 1d 6d 00 00 00 lea 0x6d(%rip),%r11 #
100001008 <_main+0xac>
100000f9b: 41 53 push %r11
100000f9d: ff 25 5d 00 00 00 jmpq *0x5d(%rip) # 100001000
<_main+0xa4>
100000fa3: 90 nop
100000fa4: 68 00 00 00 00 pushq $0x0
100000fa9: e9 e6 ff ff ff jmpq 100000f94 <_main+0x38>
%
%
% lldb -- ./a.out
(lldb) target create "./a.out"
Current executable set to './a.out' (x86_64).
(lldb) run
Process 788 launched: './a.out' (x86_64)
Process 788 stopped
* thread #1: tid = 0x185625, 0x0000000100000f64 a.out`main + 8, queue =
'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
frame #0: 0x0000000100000f64 a.out`main + 8
a.out`main:
-> 0x100000f64 <+8>: movq %fs:0x0, %rax
0x100000f6d <+17>: movq %rax, -0x8(%rbp)
0x100000f71 <+21>: xorl %eax, %eax
0x100000f73 <+23>: movl $0x0, %eax
(lldb) register read
General Purpose Registers:
rax = 0x0000000100000f5c a.out`main
rbx = 0x0000000000000000
rcx = 0x00007fff5fbfdf08
rdx = 0x00007fff5fbfdc68
rdi = 0x0000000000000001
rsi = 0x00007fff5fbfdc58
rbp = 0x00007fff5fbfdc30
rsp = 0x00007fff5fbfdc20
r8 = 0x0000000000000000
r9 = 0x00007fff7640a0c8 atexit_mutex + 24
r10 = 0x00000000ffffffff
r11 = 0xffffffff00000000
r12 = 0x0000000000000000
r13 = 0x0000000000000000
r14 = 0x0000000000000000
r15 = 0x0000000000000000
rip = 0x0000000100000f64 a.out`main + 8
rflags = 0x0000000000010202
cs = 0x000000000000002b
fs = 0x0000000000000000
gs = 0x0000000000000000
(lldb)
>From gcc-bugs-return-603646-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 03:31:02 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/85645] New: ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Date: Fri, 04 May 2018 03:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85645
Bug ID: 85645
Summary: ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-checking, ice-on-invalid-code
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: powerpc-*-linux-gnu*
Created attachment 44064
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44064&action=edit
Testcase
gcc-9.0.0-alpha20180429 snapshot (r259749) ICEs when compiling the attached
snippet w/ -mcpu=powerpc -O1 -funroll-loops -fno-dce -fno-tree-dominator-opts
-fno-tree-fre:
% powerpc-e300c3-linux-gnu-gcc-9.0.0-alpha20180429 -mcpu=powerpc -O1
-funroll-loops -fno-dce -fno-tree-dominator-opts -fno-tree-fre -w -c p4tfcqzb.c
during RTL pass: dwarf2
p4tfcqzb.c: In function 'g7':
p4tfcqzb.c:55:1: internal compiler error: in maybe_record_trace_start, at
dwarf2cfi.c:2348
}
^
0x7ce5bc maybe_record_trace_start
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180429/work/gcc-9-20180429/gcc/dwarf2cfi.c:2348
0x7d0d16 scan_trace
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180429/work/gcc-9-20180429/gcc/dwarf2cfi.c:2541
0x7d1487 create_cfi_notes
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180429/work/gcc-9-20180429/gcc/dwarf2cfi.c:2694
0x7d1487 execute_dwarf2_frame
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180429/work/gcc-9-20180429/gcc/dwarf2cfi.c:3057
0x7d1487 execute
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180429/work/gcc-9-20180429/gcc/dwarf2cfi.c:3545
In p4tfcqzb.c.312r.dwarf2 we have:
Inconsistent CFI state!
SHOULD have:
.cfi_def_cfa 1, 96
DO have:
.cfi_def_cfa 1, 96
.cfi_register 27, 25
>From gcc-bugs-return-603647-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 03:39:28 2018
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From: "bandinfinite at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/81091] libstdc++ not built with large file support
Date: Fri, 04 May 2018 03:39:00 -0000
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Jc Yang <bandinfinite at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bandinfinite at gmail dot com
--- Comment #1 from Jc Yang <bandinfinite at gmail dot com> ---
This bug also affects std::filesystem when the capacity of modern storage
devices are progressing in a fast pace.
Without 64bit _FILE_OFFSET_BITS, and consider that there's no trends among the
hardware vendors to migrate to a block size larger than 4096 in the foreseeable
future, not even the fixed in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85632 can tell the user of a 32bit
system the correct size of a partition that is as large as 20TB.
I think we need this as the ultimate fix and should force it no matter whether
it is a 64bit build or not.
>From gcc-bugs-return-603648-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 06:06:21 2018
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From: "zeccav at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/85253] [8 Regression] asan detects heap-buffer-overflow in matmul_r4.c
Date: Fri, 04 May 2018 06:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85253
--- Comment #8 from Vittorio Zecca <zeccav at gmail dot com> ---
Compiling and running under both 8.0.1 and 8.1.0
with MALLOC_CHECK_=1 (see man mallopt)
I get the following (notice "free(): invalid pointer" from mallopt)
/usr/bin/gfortran -g -O0 gfbug144.f
[vitti f95]$./a.out
free(): invalid pointer
Program received signal SIGABRT: Process abort signal.
Backtrace for this error:
#0 0x1461bb3fffcf in ???
at
/usr/src/debug/glibc-2.27-37-g39071a5539/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
#1 0x1461bb3fff4b in __GI_raise
at ../sysdeps/unix/sysv/linux/raise.c:51
#2 0x1461bb3ea590 in __GI_abort
at /usr/src/debug/glibc-2.27-37-g39071a5539/stdlib/abort.c:79
#3 0x1461bb442b0a in __libc_message
at ../sysdeps/posix/libc_fatal.c:181
#4 0x1461bb44903b in malloc_printerr
at /usr/src/debug/glibc-2.27-37-g39071a5539/malloc/malloc.c:5350
#5 0x1461bb44cdfd in free_check
at /usr/src/debug/glibc-2.27-37-g39071a5539/malloc/hooks.c:274
#6 0x400920 in MAIN__
at /home/vitti/f95/gfbug144.f:11
#7 0x4009c4 in main
at /home/vitti/f95/gfbug144.f:12
Aborted (core dumped)
with valgrind:
valgrind ./a.out
==30798== Memcheck, a memory error detector
==30798== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==30798== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==30798== Command: ./a.out
==30798==
==30798== Invalid write of size 4
==30798== at 0x4F0E903: matmul_i4_vanilla (matmul_i4.c:2035)
==30798== by 0x400920: MAIN__ (gfbug144.f:11)
==30798== by 0x4009C4: main (gfbug144.f:12)
==30798== Address 0x6079ec4 is 0 bytes after a block of size 1,028 alloc'd
==30798== at 0x4C2DBAB: malloc (vg_replace_malloc.c:299)
==30798== by 0x4F0D24A: matmul_i4_vanilla (matmul_i4.c:1995)
==30798== by 0x400920: MAIN__ (gfbug144.f:11)
==30798== by 0x4009C4: main (gfbug144.f:12)
==30798==
==30798== Invalid read of size 4
==30798== at 0x4F10EE6: matmul_i4_vanilla (matmul_i4.c:2197)
==30798== by 0x400920: MAIN__ (gfbug144.f:11)
==30798== by 0x4009C4: main (gfbug144.f:12)
==30798== Address 0x6079ec4 is 0 bytes after a block of size 1,028 alloc'd
==30798== at 0x4C2DBAB: malloc (vg_replace_malloc.c:299)
==30798== by 0x4F0D24A: matmul_i4_vanilla (matmul_i4.c:1995)
==30798== by 0x400920: MAIN__ (gfbug144.f:11)
==30798== by 0x4009C4: main (gfbug144.f:12)
==30798==
==30798== Conditional jump or move depends on uninitialised value(s)
==30798== at 0x506872E: write_decimal.constprop.10 (write.c:808)
==30798== by 0x5068B13: write_integer (write.c:1351)
==30798== by 0x5069AED: list_formatted_write_scalar (write.c:1865)
==30798== by 0x506A834: _gfortrani_list_formatted_write (write.c:1943)
==30798== by 0x400966: MAIN__ (gfbug144.f:11)
==30798== by 0x4009C4: main (gfbug144.f:12)
==30798==
7 10
==30798==
==30798== HEAP SUMMARY:
==30798== in use at exit: 0 bytes in 0 blocks
==30798== total heap usage: 22 allocs, 22 frees, 14,548 bytes allocated
==30798==
==30798== All heap blocks were freed -- no leaks are possible
==30798==
==30798== For counts of detected and suppressed errors, rerun with: -v
==30798== Use --track-origins=yes to see where uninitialised values come from
==30798== ERROR SUMMARY: 4 errors from 3 contexts (suppressed: 0 from 0)
>From gcc-bugs-return-603649-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 07:02:44 2018
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Subject: [Bug libstdc++/85642] [8/9 Regression] Wrong implicit exception-specification with std::optional
Date: Fri, 04 May 2018 07:02:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-04
Component|c++ |libstdc++
Known to work| |7.3.0
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
Target Milestone|--- |8.2
Summary|Wrong implicit |[8/9 Regression] Wrong
|exception-specification |implicit
|with std::optional |exception-specification
| |with std::optional
Ever confirmed|0 |1
Known to fail| |8.1.0, 9.0
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think I see where the problem is ...
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Subject: [Bug tree-optimization/85466] Performance is slow when doing 'branchless' conditional style math operations
Date: Fri, 04 May 2018 07:20:00 -0000
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--- Comment #23 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri May 4 07:19:45 2018
New Revision: 259921
URL: https://gcc.gnu.org/viewcvs?rev=259921&root=gcc&view=rev
Log:
PR libstdc++/85466
* real.h (real_nextafter): Declare.
* real.c (real_nextafter): New function.
* fold-const-call.c (fold_const_nextafter): New function.
(fold_const_call_sss): Call it for CASE_CFN_NEXTAFTER and
CASE_CFN_NEXTTOWARD.
(fold_const_call_1): For CASE_CFN_NEXTTOWARD call fold_const_call_sss
even when arg1_mode is different from arg0_mode.
* gcc.dg/nextafter-1.c: New test.
* gcc.dg/nextafter-2.c: New test.
* gcc.dg/nextafter-3.c: New test.
* gcc.dg/nextafter-4.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/nextafter-1.c
trunk/gcc/testsuite/gcc.dg/nextafter-2.c
trunk/gcc/testsuite/gcc.dg/nextafter-3.c
trunk/gcc/testsuite/gcc.dg/nextafter-4.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/fold-const-call.c
trunk/gcc/real.c
trunk/gcc/real.h
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-603651-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 07:22:47 2018
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Subject: [Bug libgomp/85639] ICE in compiling new test cases added in r259850
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--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 44065
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44065&action=edit
tentative patch
Using this patch, we generate:
...
(insn 5 2 6 2 (set (reg:SI 128)
(const_int 0 [0])) "loop-auto-1.c":80 -1
(nil))
(insn 6 5 7 2 (set (reg/v:DI 124 [ g+-4 ])
(sign_extend:DI (reg:SI 128))) "loop-auto-1.c":80 -1
(nil))
...
for:
...
g_6 = __builtin_goacc_parlevel_id (0);
...
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Subject: [Bug ada/85635] typo in link.c for BSD platforms
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-04
CC| |ebotcazou at gcc dot gnu.org
Version|unknown |8.1.0
Target Milestone|--- |8.2
Summary|gcc8+: typo in link.c |typo in link.c for BSD
|renders gnat unbuildable on |platforms
|non-windows, non hpux |
Ever confirmed|0 |1
--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> To be precise, only {Free,Net,Open}BSD, QNX and DragonFly ada is broken.
Yes, the subject doesn't make any sense, people build & test Ada regularly...
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Subject: [Bug lto/85574] [9 Regression] LTO bootstapped binaries differ
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri May 4 07:25:54 2018
New Revision: 259922
URL: https://gcc.gnu.org/viewcvs?rev=259922&root=gcc&view=rev
Log:
2018-05-04 Richard Biener <rguenther@suse.de>
PR middle-end/85574
* fold-const.c (negate_expr_p): Restrict negation of operand
zero of a division to when we know that can happen without
overflow.
(fold_negate_expr_1): Likewise.
* gcc.dg/torture/pr85574.c: New testcase.
* gcc.dg/torture/pr57656.c: Use dg-additional-options.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr85574.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/fold-const.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/torture/pr57656.c
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Subject: [Bug tree-optimization/85627] [6/7/8 Regression] ICE in update_phi_components in tree-complex.c
Date: Fri, 04 May 2018 07:31:00 -0000
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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
|update_phi_components in |update_phi_components in
|tree-complex.c |tree-complex.c
Known to fail|9.0 |
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
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Subject: [Bug tree-optimization/85627] [6/7/8/9 Regression] ICE in update_phi_components in tree-complex.c
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--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri May 4 07:30:50 2018
New Revision: 259923
URL: https://gcc.gnu.org/viewcvs?rev=259923&root=gcc&view=rev
Log:
2018-05-04 Richard Biener <rguenther@suse.de>
PR middle-end/85627
* tree-complex.c (update_complex_assignment): We are always in SSA
form.
(expand_complex_div_wide): Likewise.
(expand_complex_operations_1): Likewise.
(expand_complex_libcall): Preserve EH info of the original stmt.
(tree_lower_complex): Handle removed blocks.
* tree.c (build_common_builtin_nodes): Do not set ECF_NOTRHOW
on complex multiplication and division libcall builtins.
* g++.dg/torture/pr85627.C: New testcase.
Added:
trunk/gcc/testsuite/g++.dg/torture/pr85627.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-complex.c
trunk/gcc/tree.c
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85588] [6/7/8 Regression] -fwrapv miscompilation
Date: Fri, 04 May 2018 07:31:00 -0000
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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] |[6/7/8 Regression] -fwrapv
|-fwrapv miscompilation |miscompilation
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.
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Subject: [Bug ada/85540] gcc/ada/init.c:1282: suspicious expression ?
Date: Fri, 04 May 2018 07:32:00 -0000
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--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Fri May 4 07:31:43 2018
New Revision: 259924
URL: https://gcc.gnu.org/viewcvs?rev=259924&root=gcc&view=rev
Log:
PR ada/85540
* init.c (__gnat_handle_vms_condition): Add missing parentheses.
Modified:
branches/gcc-8-branch/gcc/ada/ChangeLog
branches/gcc-8-branch/gcc/ada/init.c
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Subject: [Bug tree-optimization/85627] [6/7/8 Regression] ICE in update_phi_components in tree-complex.c
Date: Fri, 04 May 2018 07:33:00 -0000
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--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note backports should just contain the hunk from comment#2 and not try
preserving EH info.
>From gcc-bugs-return-603658-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 07:33:14 2018
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Subject: [Bug ada/85635] typo in link.c for BSD platforms
Date: Fri, 04 May 2018 07:33:00 -0000
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--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Fri May 4 07:32:36 2018
New Revision: 259925
URL: https://gcc.gnu.org/viewcvs?rev=259925&root=gcc&view=rev
Log:
PR ada/85635
* link.c (BSD platforms): Add missing backslash.
Modified:
trunk/gcc/ada/ChangeLog
trunk/gcc/ada/link.c
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Subject: [Bug ada/85635] typo in link.c for BSD platforms
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--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Fri May 4 07:32:48 2018
New Revision: 259926
URL: https://gcc.gnu.org/viewcvs?rev=259926&root=gcc&view=rev
Log:
PR ada/85635
* link.c (BSD platforms): Add missing backslash.
Modified:
branches/gcc-8-branch/gcc/ada/ChangeLog
branches/gcc-8-branch/gcc/ada/link.c
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Subject: [Bug ada/85635] typo in link.c for BSD platforms
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Thanks for reporting the problem.
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Subject: [Bug go/85629] GCC 8.1.0: FTBFS: make check fails in Go part
Date: Fri, 04 May 2018 07:37:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-linux
CC| |cmang at google dot com
Component|bootstrap |go
Assignee|unassigned at gcc dot gnu.org |ian at airs dot com
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
make check isn't expected to succeed.
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Subject: [Bug go/85630] GCC 8.1.0: Filesystem pollution during build: .cache dir in $HOME
Date: Fri, 04 May 2018 07:40:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-04
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ugh, this is probably also slowing down build/testing time with $home on NFS
for me :/
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Subject: [Bug middle-end/38960] Wrong floating point reorder
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jtaylor.debian at googlemail dot c
| |om
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 85633 has been marked as a duplicate of this bug. ***
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Subject: [Bug middle-end/85633] reorders function ignoring fpu exception state
Date: Fri, 04 May 2018 07:43:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-*-*, i?86-*-*
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Dup.
*** This bug has been marked as a duplicate of bug 38960 ***
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Subject: [Bug libgomp/85639] ICE in compiling new test cases added in r259850
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code, openacc,
| |patch
--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2018-05/msg00192.html
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Subject: [Bug middle-end/38960] Wrong floating point reorder
Date: Fri, 04 May 2018 07:49:00 -0000
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note that a not too disruptive "implementation" of the dependences would be
to add outgoing abnormal edges to the fenv* calls. Not too
disruptive in terms of implementation - the effect on code generation might
be very noticable though (note that all calls to functions that might call
fenv* functions themselves are subject to the same treatment). Of course
there's the (existing) issue of RTL expansion not maintaining abnormal edges.
You can experiment with this by declaring the fenv* functions with
__attribute__((returns_twice)).
Note w/o also having incoming abnormal edges this might not be a full barrier
for downward motion.
>From gcc-bugs-return-603668-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 07:50:13 2018
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Subject: [Bug c++/85634] [8/9 Regression] ICE in tsubst_copy, at cp/pt.c:15483
Date: Fri, 04 May 2018 07:50:00 -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| |7.3.1
Known to fail| |8.1.0
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Subject: [Bug ada/85638] [8 regression] build failure for Ada runtime with SJLJ exceptions on x86
Date: Fri, 04 May 2018 08:01:00 -0000
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-04
CC| |ebotcazou at gcc dot gnu.org
Host|x86_64-pc-linux-gnu |
Target Milestone|--- |8.2
Summary|gcc 8.1.0 fails to build |[8 regression] build
|ada language for target |failure for Ada runtime
|i686-w64-mingw32 |with SJLJ exceptions on x86
Ever confirmed|0 |1
--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
It might be time to switch to DWARF-2 exception handling...
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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/85636] Tree if-conversion inserts redundant loads
Date: Fri, 04 May 2018 08:02:00 -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| |2018-05-04
CC| |rguenth at gcc dot gnu.org
Version|unknown |9.0
Summary|Tree if-conversion inserts |Tree if-conversion inserts
|bogus loads |redundant loads
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think this is just a missed optimization from the fact that we have two
conditional stores to a[i] before if-conversion. Those get introduced
by jump-threading which duplicates them when threading the v == 20
controlled paths through the dominated v != 20 condition.
Now - what if-conversion could recognize is that we are dealing with
the same store on each path and avoid the RMW transform it does.
Currently it translates
if (v_12 == 20)
a[i] = x;
else
a[i] = y;
as
a[i] = v_12 == 20 ? x : a[i];
a[i] = v_12 == 20 ? a[i] : y;
somehow "merging" those conditional stores where that is valid is missing.
>From gcc-bugs-return-603671-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 08:05:35 2018
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Subject: [Bug middle-end/85637] Unneeded store of member variables in inner loop
Date: Fri, 04 May 2018 08:05:00 -0000
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
__restrict should work fine for char pointers. With
__attribute__((noinline))
void Update(const void* __restrict b, unsigned int len)
{
if (len) {
...
I get with -O2
_ZN7Adler326UpdateEi:
.LFB3:
.cfi_startproc
movzbl %sil, %esi
addl (%rdi), %esi
movl $-2146992015, %ecx
movl 4(%rdi), %r8d
movl %esi, %eax
addl %esi, %r8d
mull %ecx
movl %r8d, %eax
shrl $15, %edx
imull $65521, %edx, %edx
subl %edx, %esi
mull %ecx
movl %esi, (%rdi)
movl %edx, %ecx
shrl $15, %ecx
imull $65521, %ecx, %ecx
subl %ecx, %r8d
movl %r8d, 4(%rdi)
ret
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85641] [7/8/9 Regression] ICE with string concatenate
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Priority|P3 |P4
Known to work| |7.3.0
Blocks| |68241
Target Milestone|--- |7.4
Summary|[7/8 Regression] ICE with |[7/8/9 Regression] ICE with
|string concatenate |string concatenate
Known to fail| |7.3.1, 8.1.0, 9.0
--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Likely r251125 for 8.0.1 and r257912 for 7.3.1 (pr81116).
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68241
[Bug 68241] [meta-bug] [F03] Deferred-length character
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Subject: [Bug middle-end/85637] Unneeded store of member variables in inner loop
Date: Fri, 04 May 2018 08:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85637
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Err, wrong function assembly pasted. Note you also can make this * restrict
via
__attribute__((noinline))
void Update(const void* b, unsigned int len) __restrict
{
if (len) {
which has the same effect.
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Subject: [Bug target/85640] [8/9 Regression] Code size regression vs 7.3.1
Date: Fri, 04 May 2018 08:12:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target Milestone|--- |8.2
Summary|Code size regression vs |[8/9 Regression] Code size
|7.3.1 |regression vs 7.3.1
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From: "duarte at scylladb dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85646] New: Incorrect lambda visibility with -fvisibility=hidden
Date: Fri, 04 May 2018 08:14:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85646
Bug ID: 85646
Summary: Incorrect lambda visibility with -fvisibility=hidden
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: duarte at scylladb dot com
Target Milestone: ---
Consider the following program:
template<typename T>
void foo() {
struct inner {
inner() {
(void)([this] { });
}
};
}
int main() { foo<int>(); }
Compiles fine on 6.3, but fails on 7.1, 7.2, 7.3, 8.0.1 and 8.1, with
<source>:5:13: error: 'foo()::inner::inner() [with T = int]::<lambda()>'
declared with greater visibility than the type of its field
'foo()::inner::inner() [with T = int]::<lambda()>::<this capture>'
[-Werror=attributes]
Godbolt: https://godbolt.org/g/aGaVgd
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Subject: [Bug c++/85646] [7/8/9 Regression] Incorrect lambda visibility with -fvisibility=hidden
Date: Fri, 04 May 2018 08:16:00 -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|Incorrect lambda visibility |[7/8/9 Regression]
|with -fvisibility=hidden |Incorrect lambda visibility
| |with -fvisibility=hidden
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Subject: [Bug ada/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |ebotcazou at gcc dot gnu.org
--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Investigating.
>From gcc-bugs-return-603678-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 08:29:45 2018
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Subject: [Bug libgomp/85639] ICE in compiling new test cases added in r259850
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--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Fri May 4 08:29:08 2018
New Revision: 259927
URL: https://gcc.gnu.org/viewcvs?rev=259927&root=gcc&view=rev
Log:
[expand] Handle null target in expand_builtin_goacc_parlevel_id_size
2018-05-04 Tom de Vries <tom@codesourcery.com>
PR libgomp/85639
* builtins.c (expand_builtin_goacc_parlevel_id_size): Handle null
target
if ignore == 0.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/builtins.c
>From gcc-bugs-return-603679-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 08:31:44 2018
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Subject: [Bug libgomp/85639] ICE in compiling new test cases added in r259850
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
Patch committed, no need for extra test-cases, marking resolved-fixed.
>From gcc-bugs-return-603680-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 08:57:23 2018
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/15210] gcc-3.4.0.tar.gz fails to unpack on SunOS 5.7
Date: Fri, 04 May 2018 08:57:00 -0000
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Dennis Clarke <dclarke at blastwave dot org> changed:
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----------------------------------------------------------------------------
CC| |dclarke at blastwave dot org
--- Comment #4 from Dennis Clarke <dclarke at blastwave dot org> ---
Off the shelf old /usr/bin/tar in Solaris 10 can not extract released
gcc-8.1.0.tar files as it issues :
tar: ././@LongLink: typeflag 'L' not recognized, converting to regular file
Feels like an old 'non-bug' has awoken .. however gnu tar has no issues
and neither does Jörg Schilling's POSIX tar. ( called star for standard
tar ).
Merely an update here ... nothing to see .. moving along.
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/85642] [8/9 Regression] Wrong implicit exception-specification with std::optional
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Fri May 4 08:57:23 2018
New Revision: 259928
URL: https://gcc.gnu.org/viewcvs?rev=259928&root=gcc&view=rev
Log:
PR libstdc++/85642 fix is_nothrow_default_constructible<optional<T>>
Add missing noexcept keyword to default constructor of each
_Optional_payload specialization.
PR libstdc++/85642 fix is_nothrow_default_constructible<optional<T>>
* include/std/optional (_Optional_payload): Add noexcept to default
constructor. Re-indent.
(_Optional_payload<_Tp, true, true, true>): Likewise. Add noexcept to
constructor for copying disengaged payloads.
(_Optional_payload<_Tp, true, false, true>): Likewise.
(_Optional_payload<_Tp, true, true, false>): Likewise.
(_Optional_payload<_Tp, true, false, false>): Likewise.
* testsuite/20_util/optional/cons/85642.cc: New.
* testsuite/20_util/optional/cons/value_neg.cc: Adjust dg-error lines.
Added:
trunk/libstdc++-v3/testsuite/20_util/optional/cons/85642.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/std/optional
trunk/libstdc++-v3/testsuite/20_util/optional/cons/value_neg.cc
>From gcc-bugs-return-603682-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 09:01:00 2018
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Subject: [Bug c++/85646] [7/8/9 Regression] Incorrect lambda visibility with -fvisibility=hidden
Date: Fri, 04 May 2018 09:00:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-04
CC| |jakub at gcc dot gnu.org,
| |jason at gcc dot gnu.org,
| |nathan at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r245398.
>From gcc-bugs-return-603683-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 09:11:39 2018
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From: "duarte at scylladb dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85646] [7/8/9 Regression] Incorrect lambda visibility with -fvisibility=hidden
Date: Fri, 04 May 2018 09:11:00 -0000
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--- Comment #2 from Duarte <duarte at scylladb dot com> ---
I forgot to add that it compiles successfully without -fvisibility=hidden, and
without the template.
>From gcc-bugs-return-603684-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 09:43:15 2018
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From: "Sagar2.shah at citi dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85647] New: gcc 5.4.0 always takes c++11 string
Date: Fri, 04 May 2018 09:43:00 -0000
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Bug ID: 85647
Summary: gcc 5.4.0 always takes c++11 string
Product: gcc
Version: 5.4.0
Status: UNCONFIRMED
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Priority: P3
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Please refer below sample program -
$ cat string.cpp
#include <iostream>
#include <string>
void foo(const std::string& arg)
{
std::cout << "foo [" << arg << "]" << std::endl;
}
int main()
{
std::string arg("123");
foo(arg);
}
$ g++ --version
_g++ (GCC) 5.4.0
Copyright (C) 2015 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.
$ g++ -std=c++98 string.cpp
$ nm a.out | grep foo
0000000000400d30 t
_GLOBAL__sub_I__Z3fooRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE
0000000000400c18 T _Z3fooRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE
$ rm a.out
rm: remove regular file `a.out'? y
$ g++ -std=c++14 string.cpp
$ nm a.out | grep foo
0000000000400d30 t
_GLOBAL__sub_I__Z3fooRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE
0000000000400c18 T _Z3fooRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE
When I compile above program with -std=c++14 and -std=c++98, I see that it
resolves std::string to __cxx1112basic_stringIcSt11char_traits in both the
cases.
I have a legacy library compiled with gcc 4.4.7 and takes string/std::map
arguments and if my application compiled with gcc 5.4.0 and with c++98 flag on
tries to link with that library i run into linker error, as the legacy library
is not able to understand c++11 string.
Should't gcc resolve std::string to c++98 string.? or 5.4.0 has stopped
supporting c++98 and is not backward compatible?
>From gcc-bugs-return-603685-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 09:52:11 2018
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Subject: [Bug libstdc++/81091] libstdc++ not built with large file support
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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> ---
I was concerned this would be an ABI change for 32-bit targets, but libstdc++
already ensures that std::streamoff is a 64-bit type even when ::off_t isn't.
So now I think building it with large file support should not change the type
of anything in the libstdc++ API or the exported ABI.
>From gcc-bugs-return-603686-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 09:53:12 2018
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Subject: [Bug c++/85647] gcc 5.4.0 always takes c++11 string
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |INVALID
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is behaving as intended, read
https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html for
details.
>From gcc-bugs-return-603687-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 09:58:21 2018
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Subject: [Bug libstdc++/85642] [8/9 Regression] Wrong implicit exception-specification with std::optional
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Fri May 4 09:57:42 2018
New Revision: 259930
URL: https://gcc.gnu.org/viewcvs?rev=259930&root=gcc&view=rev
Log:
PR libstdc++/85642 fix is_nothrow_default_constructible<optional<T>>
Add missing noexcept keyword to default constructor of each
_Optional_payload specialization.
PR libstdc++/85642 fix is_nothrow_default_constructible<optional<T>>
* include/std/optional (_Optional_payload): Add noexcept to default
constructor. Re-indent.
(_Optional_payload<_Tp, true, true, true>): Likewise. Add noexcept to
constructor for copying disengaged payloads.
(_Optional_payload<_Tp, true, false, true>): Likewise.
(_Optional_payload<_Tp, true, true, false>): Likewise.
(_Optional_payload<_Tp, true, false, false>): Likewise.
* testsuite/20_util/optional/cons/85642.cc: New.
* testsuite/20_util/optional/cons/value_neg.cc: Adjust dg-error lines.
Added:
branches/gcc-8-branch/libstdc++-v3/testsuite/20_util/optional/cons/85642.cc
Modified:
branches/gcc-8-branch/libstdc++-v3/ChangeLog
branches/gcc-8-branch/libstdc++-v3/include/std/optional
branches/gcc-8-branch/libstdc++-v3/testsuite/20_util/optional/cons/value_neg.cc
>From gcc-bugs-return-603688-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 10:04:55 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85647] gcc 5.4.0 always takes c++11 string
Date: Fri, 04 May 2018 10:04:00 -0000
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--- Comment #2 from Sagar Shah <Sagar2.shah at citi dot com> ---
thanks for your prompt response.
>From gcc-bugs-return-603689-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 10:06:47 2018
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Subject: [Bug ada/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86
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--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
It's a direct fallout of the fix for PR rtl-optimization/85393:
FOR_EACH_EDGE (e, ei, bb->preds)
{
gcc_assert (e->flags & EDGE_EH);
if (BB_PARTITION (bb) == BB_PARTITION (e->src))
all_diff = false;
else
all_same = false;
}
which creates incoming edges to landing pads that are not EH edges.
>From gcc-bugs-return-603690-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 10:09:09 2018
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Subject: [Bug libstdc++/85642] [8/9 Regression] Wrong implicit exception-specification with std::optional
Date: Fri, 04 May 2018 10:09:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for 8.2, thanks for the report.
>From gcc-bugs-return-603691-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 10:11:38 2018
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Date: Fri, 04 May 2018 10:11:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Can't reproduce with a cross-compiler.
>From gcc-bugs-return-603692-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 10:22:44 2018
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Subject: [Bug ada/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86
Date: Fri, 04 May 2018 10:22:00 -0000
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--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
The key point is that several elements of cfun->eh->lp_array can share the same
landing pad:
(gdb) p *cfun->eh->lp_array->m_vecdata[1]
$11 = {next_lp = 0x0, region = 0x7ffff695c898,
post_landing_pad = 0x7ffff695df80, landing_pad = 0x7ffff6a6b200, index = 1}
(gdb) p *cfun->eh->lp_array->m_vecdata[2]
$12 = {next_lp = 0x0, region = 0x7ffff695c8f0,
post_landing_pad = 0x7ffff695de80, landing_pad = 0x7ffff6a6b200, index = 2}
(gdb) p *cfun->eh->lp_array->m_vecdata[1]->region
$13 = {outer = 0x0, inner = 0x0, next_peer = 0x0, index = 1, type = ERT_TRY,
u = {eh_try = {first_catch = 0x7ffff6964398, last_catch = 0x7ffff6964398},
allowed = {type_list = 0x7ffff6964398, label = 0x7ffff6964398,
filter = 0}, must_not_throw = {failure_decl = 0x7ffff6964398,
failure_loc = 4137042840}}, landing_pads = 0x7ffff69648c0,
exc_ptr_reg = 0x7ffff6a6a2a0, filter_reg = 0x7ffff6a6a150,
use_cxa_end_cleanup = false}
(gdb) p *cfun->eh->lp_array->m_vecdata[2]->region
$14 = {outer = 0x0, inner = 0x0, next_peer = 0x7ffff695c898, index = 2,
type = ERT_CLEANUP, u = {eh_try = {first_catch = 0x0, last_catch = 0x0},
allowed = {type_list = 0x0, label = 0x0, filter = 0}, must_not_throw = {
failure_decl = 0x0, failure_loc = 0}}, landing_pads = 0x7ffff69643c0,
exc_ptr_reg = 0x7ffff6a6a8e8, filter_reg = 0x0, use_cxa_end_cleanup = false}
>From gcc-bugs-return-603693-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 10:24:57 2018
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Subject: [Bug ada/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #44060|0 |1
is obsolete| |
Attachment #44061|0 |1
is obsolete| |
--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Created attachment 44066
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44066&action=edit
Tentative fix
To be tested.
>From gcc-bugs-return-603694-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 10:38:57 2018
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Date: Fri, 04 May 2018 10:38:00 -0000
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--- Comment #2 from Arseny Solokha <asolokha at gmx dot com> ---
One remarkable thing about this testcase is that in my setup it makes gcc ICE
w/ almost any valid argument to -mcpu. gcc successfully compiles it only w/
-mcpu={power6,power6x,power7,power8,power9,powerpc64le}. gcc for powerpcspe
target compiles it as well.
Should I attach my gcc/auto-host.h?
% powerpc-e300c3-linux-gnu-gcc-9.0.0-alpha20180429 -v
Using built-in specs.
COLLECT_GCC=powerpc-e300c3-linux-gnu-gcc-9.0.0-alpha20180429
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/powerpc-e300c3-linux-gnu/9.0.0-alpha20180429/lto-wrapper
Target: powerpc-e300c3-linux-gnu
Configured with:
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-9.0.0_alpha20180429/work/gcc-9-20180429/configure
--host=x86_64-pc-linux-gnu --target=powerpc-e300c3-linux-gnu
--build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/powerpc-e300c3-linux-gnu/gcc-bin/9.0.0-alpha20180429
--includedir=/usr/lib/gcc/powerpc-e300c3-linux-gnu/9.0.0-alpha20180429/include
--datadir=/usr/share/gcc-data/powerpc-e300c3-linux-gnu/9.0.0-alpha20180429
--mandir=/usr/share/gcc-data/powerpc-e300c3-linux-gnu/9.0.0-alpha20180429/man
--infodir=/usr/share/gcc-data/powerpc-e300c3-linux-gnu/9.0.0-alpha20180429/info
--with-gxx-include-dir=/usr/lib/gcc/powerpc-e300c3-linux-gnu/9.0.0-alpha20180429/include/g++-v9
--with-python-dir=/share/gcc-data/powerpc-e300c3-linux-gnu/9.0.0-alpha20180429/python
--enable-languages=c,c++ --enable-obsolete --enable-secureplt --disable-werror
--with-system-zlib --disable-nls --enable-checking=yes --disable-esp
--enable-libstdcxx-time --enable-poison-system-directories
--with-sysroot=/usr/powerpc-e300c3-linux-gnu --disable-bootstrap
--enable-__cxa_atexit --enable-clocale=gnu --disable-multilib --disable-altivec
--disable-fixed-point --enable-targets=all --disable-libgcj --enable-libgomp
--disable-libmudflap --disable-libssp --disable-libcilkrts --disable-libmpx
--disable-vtable-verify --disable-libvtv --disable-libquadmath --enable-lto
--with-isl --disable-isl-version-check --disable-libsanitizer
Thread model: posix
gcc version 9.0.0-alpha20180429 20180429 (experimental) (GCC)
>From gcc-bugs-return-603695-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 10:47:42 2018
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |segher at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
./cc1 -quiet -nostdinc -m32 -mcpu=e300c2 -O1 -funroll-loops -fno-dce
-fno-tree-dominator-opts -fno-tree-fre -w pr85645.c
./cc1 -quiet -nostdinc -m32 -mcpu=powerpc -O1 -funroll-loops -fno-dce
-fno-tree-dominator-opts -fno-tree-fre -w pr85645.c
./cc1 -quiet -nostdinc -m32 -mcpu=power4 -O1 -funroll-loops -fno-dce
-fno-tree-dominator-opts -fno-tree-fre -w pr85645.c
./cc1 -quiet -nostdinc -m32 -mcpu=power5 -O1 -funroll-loops -fno-dce
-fno-tree-dominator-opts -fno-tree-fre -w pr85645.c
./cc1 -quiet -nostdinc -m32 -mcpu=power6 -O1 -funroll-loops -fno-dce
-fno-tree-dominator-opts -fno-tree-fre -w pr85645.c
all work, tried also -fpie, -fpic, -fasynchronous-unwind-tables -g,
-msecure-plt.
I'm simply out of ideas how to reproduce this.
>From gcc-bugs-return-603696-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 11:07:17 2018
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-04
Ever confirmed|0 |1
--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
~/build/tot/gcc/cc1 -quiet -Wall -W 85645.c -mcpu=powerpc -O1 -funroll-loops
-fno-dce -fno-tree-dominator-opts -fno-tree-fre -m32
fails for me. Confirmed.
>From gcc-bugs-return-603697-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 11:08:59 2018
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Subject: [Bug c++/71484] Class with implicit public constructor triggers `-Wctor-dtor-privacy`
Date: Fri, 04 May 2018 11:08:00 -0000
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James Legg <jlegg at feralinteractive dot com> changed:
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----------------------------------------------------------------------------
CC| |jlegg at feralinteractive dot com
--- Comment #1 from James Legg <jlegg at feralinteractive dot com> ---
In GCC 8.1, it can also be triggered without private methods, by explicitly
deleting the default copy constructor. For example:
struct S
{
S(const S &) = delete;
S & operator =(const S &) = delete;
int x;
};
Struct S has an implicit public constructor, despite which GCC 8.1 complains:
<source>:1:8: error: 'struct S' only defines private constructors and has no
friends [-Werror=ctor-dtor-privacy]
struct S
^
<source>:3:2: note: 'S::S(const S&)' is public, but requires an existing
'struct S' object
S(const S &) = delete;
^
>From gcc-bugs-return-603698-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 11:09:42 2018
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
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--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
saw edge from trace 1 to 4 (via jump_insn 42)
...
Processing trace 3 : start at code_label 507
saw edge from trace 3 to 4 (via fallthru 0)
Inconsistent CFI state!
SHOULD have:
.cfi_def_cfa 1, 96
DO have:
.cfi_def_cfa 1, 96
.cfi_register 27, 25
>From gcc-bugs-return-603699-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 11:18:16 2018
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Subject: [Bug middle-end/85637] Unneeded store of member variables in inner loop
Date: Fri, 04 May 2018 11:18:00 -0000
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--- Comment #5 from petschy at gmail dot com ---
Thanks, in this specific case __restrict works indeed.
On a side note, is it possible to achieve the same when a char is stored
through a char* member, and also incremented? eg:
if (m_cur < m_end)
*m_cur = val;
++m_cur;
Since char* aliases everything, m_cur and m_end won't be kept in registers
properly as the compiler assumes that the store through *m_cur might have
changed them. No amount of __restrict pepper helped with this.
Is it far fetched to request an extension which can be turned on via a cmdline
flag and causes 'char* __restict p' to behave like any other restricted ptr, ie
not aliasing any other char*'s, let alone other types? Any serialization code
that uses classes to store the ptrs would benefit from this, as no more in-loop
re-load/store would be needed for the members.
>From gcc-bugs-return-603700-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 11:21:02 2018
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
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--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
It goes wrong in cprop_hardreg, which replaces
insn/f 482 43 483 5 (set (reg:SI 25 25)
(reg:SI 65 lr)) 502 {*movsi_internal1}
(expr_list:REG_DEAD (reg:SI 65 lr)
(expr_list:REG_CFA_REGISTER (nil)
(nil))))
by
(insn/f 482 43 483 5 (set (reg:SI 25 25)
(reg:SI 27 27 [65])) 502 {*movsi_internal1}
(expr_list:REG_DEAD (reg:SI 65 lr)
(expr_list:REG_CFA_REGISTER (nil)
(nil))))
>From gcc-bugs-return-603701-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 11:33:19 2018
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
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--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Or actually, rnreg is the culprit (it was reg 0, rnreg moved this to reg 25)?
>From gcc-bugs-return-603702-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 11:40:59 2018
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Subject: [Bug tree-optimization/84362] [7/8/9 Regression] Auto-vectorization regression when accessing member variable through getter/accessor
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Matthias Noack <ma.noack.pr at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ma.noack.pr at gmail dot com
--- Comment #2 from Matthias Noack <ma.noack.pr at gmail dot com> ---
As written on SO, replacing
asm volatile("" : : "g"(&v) : "memory");
By
return v.values[capacity - 1];
to avoid the loop being optimised away, leads to the same vectorised code in
7.x as well. So the missed vectorisation, or not inlining size() before
vectorisation causing non-vectorisation due to:
<source>:24:29: note: not vectorized: complicated access pattern.
might be a side effect of the asm volatile() line.
>From gcc-bugs-return-603703-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 11:49:29 2018
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Subject: [Bug fortran/85575] Acceptance of invalid code: ordering of declaration statements with implicit typing
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Compiling
function constr_quark_loopline(ho,sho) result(cl)
integer, dimension(sho), intent(in) :: ho
integer, dimension(sho) :: hor
integer, intent(in) :: sho
end function constr_quark_loopline
with various version of gfortran gives
pr85575.f90:4:44:
integer, intent(in) :: sho
1
Error: Symbol 'sho' at (1) already has basic type of REAL
pr85575.f90:2:21:
integer, dimension(sho), intent(in) :: ho
1
Error: Expression at (1) must be of INTEGER type, found REAL
...
>From gcc-bugs-return-603704-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 11:49:30 2018
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Subject: [Bug demangler/85648] New: Name mangling using decltype omits namespace
Date: Fri, 04 May 2018 11:49:00 -0000
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Bug ID: 85648
Summary: Name mangling using decltype omits namespace
Product: gcc
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The code below will yield mangled names that are inconsistent with Clang and
ICC.
---
#include <cmath>
#include <utility>
template<typename T> class vector {};
template<typename T>
auto f(vector<T> const& v, T const& x)
-> vector<decltype(std::declval<T>())> { return {}; }
template auto f(vector<float> const& v, float const& x)
-> vector<decltype(std::declval<float>())>;
template<typename T>
vector<decltype(std::sqrt(T()))>
sqrt(vector<T> const& v)
{ return {}; }
template vector<decltype(std::sqrt(float()))>
sqrt(vector<float> const&);
---
You can also see it here: https://godbolt.org/g/ZSYUEB
gcc-7.3.0 generates these mangled names:
_Z1fIfE6vectorIDTcl7declvalIT_EEEERKS0_IS1_ERKS1_
_Z4sqrtIfE6vectorIDTcl4sqrtcvT__EEEERKS0_IS1_E
which are demangled by c++filt as:
vector<decltype ((declval<float>)())> f<float>(vector<float> const&, float
const&)
vector<decltype (sqrt((float)()))> sqrt<float>(vector<float> const&)
while both clang and icc mangle the names including the namespaces:
_Z1fIfE6vectorIDTclsr3stdE7declvalIT_EEEERKS0_IS1_ERKS1_
_Z4sqrtIfE6vectorIDTclsr3stdE4sqrtcvT__EEEERKS0_IS1_E
and c++filt fails to demangle these symbols.
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Subject: [Bug fortran/85407] Replace gcc_assert in module.c:read_module by more helpful diagnostics
Date: Fri, 04 May 2018 11:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85407
Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-05-04
Ever confirmed|0 |1
--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The trunk is now at 9.0. The patch can be committed if accepted.
>From gcc-bugs-return-603706-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 12:16:30 2018
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Subject: [Bug libgomp/85649] New: [og7, nvptx, openacc] Too much workers chosen for launch
Date: Fri, 04 May 2018 12:16:00 -0000
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Bug ID: 85649
Summary: [og7, nvptx, openacc] Too much workers chosen for
launch
Product: gcc
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On the og7 branch for Titan V, we run into this error message in testsuite
polybench for testcases covariance and lu:
...
libgomp: The Nvidia accelerator has insufficient resources to launch
'x$_omp_fn$0' with num_workers = 27 and vector_length = 32; recompile the
program with 'num_workers = x and vector_length = y' on that offloaded region
or '-fopenacc-dim=-:x:y' where x * y <= 768.
...
The problem here is that num_workers is chosen by libgomp, and instead of
giving the error, it should reduce the num_workers.
>From gcc-bugs-return-603707-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 12:23:52 2018
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Subject: [Bug ada/85635] typo in link.c for BSD platforms
Date: Fri, 04 May 2018 12:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85635
--- Comment #7 from John Marino <gnugcc at marino dot st> ---
It's a condition ladder.
The windows and hpux conditions are first on the ladder. The cpp bug would
have been short-circuited on those platforms. For any platform that has the
condition test fall to BSD first would be broken. E.g. __APPLE__, __linux__,
etc. which come afterwards.
All those conditions have to pass the BSD check; they would fail too. The
subject should not be confusing once the code is seen.
Thanks for fixing it though.
>From gcc-bugs-return-603708-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 12:38:29 2018
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Subject: [Bug ada/85635] typo in link.c for BSD platforms
Date: Fri, 04 May 2018 12:38:00 -0000
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
No, for non-BSD the preprocessor sees:
#elif defined (__FreeBSD__) || defined (__DragonFly__) \
|| defined (__NetBSD__) || defined (__OpenBSD__)
and if not one of these 4, it skips all the tokens until the next #elif, so
the || defined (__QNX__) tokens are skipped too.
Several linux targets are tested daily by many people, if Ada would not
bootstrap, it wouldn't go unnoticed.
>From gcc-bugs-return-603709-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 12:47:06 2018
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Subject: [Bug ada/85635] typo in link.c for BSD platforms
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--- Comment #9 from John Marino <gnugcc at marino dot st> ---
Those "many" people don't build gnat. Very few people do according to the
testsuite results page.
link.c code was:
#if defined (__WIN32)
(block 1)
#elif defined (__hpux__)
(block 2)
#elif defined (__FreeBSD__) || defined (__DragonFly__) \
|| defined (__NetBSD__) || defined (__OpenBSD__)
|| defined (__QNX__)
(block 3)
#elif defined (__APPLE__)
(block 4)
#elif defined (__linux__) || defined (__GLIBC__)
(block 5)
#elif defined (_AIX)
(block 6)
#elif (HAVE_GNU_LD)
(block 7)
#elif defined (VMS)
(block 8)
#elif defined (__sun__)
(block 9)
#elif defined (__svr4__) && defined (__i386__)
(block 10)
#else
(block 11)
#endif
I don't see how it would have compiled on linux. The cpp would have chocked on
__QNX__ check on the __linux__ platform just as it would for any of the BSDs.
It wasn't a BSD-only issue.
>From gcc-bugs-return-603710-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 12:51:55 2018
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Subject: [Bug ada/85635] typo in link.c for BSD platforms
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--- Comment #10 from John Marino <gnugcc at marino dot st> ---
ah, i see you explained what technically happened in the comment above. I
missed that at first.
That's how the QNX line was visibly limited to the BSD platforms then. cpp
didn't consider it a macro. got it.
>From gcc-bugs-return-603711-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 12:55:25 2018
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Subject: [Bug ada/85635] typo in link.c for BSD platforms
Date: Fri, 04 May 2018 12:55:00 -0000
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--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Those many people do build gnat. I do it in all my bootstraps, many other
people working on gcc do.
And if you don't know how the C preprocessor works in this case, why don't you
just try that out?
#if defined (A)
int a;
#elif defined (B) || defined (C) \
|| defined (D) || defined (E)
|| defined (F)
int b;
#elif defined (G)
int c;
#else
int d;
#endif
$ gcc -P -E -DA /tmp/j.c
int a;
$ gcc -P -E -DB /tmp/j.c
|| defined (F)
int b;
This preprocesses fine, but is not valid C.
$ gcc -P -E -DG /tmp/j.c
int c;
$ gcc -P -E -DH /tmp/j.c
int d;
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Subject: [Bug middle-end/85650] New: Additional warnings when -fsanitize=undefined is used with -Wstringop-truncation
Date: Fri, 04 May 2018 13:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85650
Bug ID: 85650
Summary: Additional warnings when -fsanitize=undefined is used
with -Wstringop-truncation
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
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Created attachment 44067
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44067&action=edit
testcase 1
These 2 testcases show additional warnings when -fsanitize=undefined is added
to the commandline.
$ LANG=C gcc-8 -c -O2 -fsanitize=undefined -Wstringop-truncation t8.c
t8.c: In function 'ay':
t8.c:13:3: warning: 'strncpy' output may be truncated copying between 0 and
7998 bytes from a string of length 7999 [-Wstringop-truncation]
strncpy(c, a, b);
^~~~~~~~~~~~~~~~
$ LANG=C gcc-8 -c -O2 -fsanitize=undefined -Wstringop-truncation t9.c
t9.c: In function 'd':
t9.c:15:3: warning: 'strncpy' output may be truncated copying between 0 and
4094 bytes from a string of length 4094 [-Wstringop-truncation]
strncpy(st, a.ah.a, len);
^~~~~~~~~~~~~~~~~~~~~~~~
Current trunk@r259927 shows the same behaviour.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85650
--- Comment #1 from Franz Sirl <sirl at gcc dot gnu.org> ---
Created attachment 44068
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44068&action=edit
testcase 2
>From gcc-bugs-return-603714-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 13:19:50 2018
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From: "gnugcc at marino dot st" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ada/85635] typo in link.c for BSD platforms
Date: Fri, 04 May 2018 13:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85635
--- Comment #12 from John Marino <gnugcc at marino dot st> ---
yeah, my problem is that I was thinking cpp was complaining this whole time,
but it was actually the c compiler. Once I realized that, the misconception
cleared up. My fault, should've known better.
And I should have been building gcc trunk more frequently so it would've been
caught before release.
>From gcc-bugs-return-603715-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 13:20:54 2018
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From: "gburca-gnu at ebixio dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85651] New: Invalid -Warray-bounds warning with -O3
Date: Fri, 04 May 2018 13:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85651
Bug ID: 85651
Summary: Invalid -Warray-bounds warning with -O3
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
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Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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Created attachment 44069
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44069&action=edit
Code demonstrating issue
https://godbolt.org/g/LmJDVa
When compiled with g++ 8.1.0 and "-c -std=gnu++17 -Wall -Werror -O3" the
attached code (alternatively, see link above) issues the following array-bounds
warning. Furthermore, the warning can not be ignored with diagnostic pragmas.
cc1plus: error: ‘void* __builtin_memcpy(void*, const void*, long unsigned int)’
offset [-9223372036854775799, -9223372036854775801] is out of the bounds [0,
128] of object ‘logBuilder’ with type ‘LogBuilder’ [-Werror=array-bounds]
Ways to make the warning go away include:
- Compiling with -O2
- Changing the "ptr_" type to size_t
No warning is issued when compiled with 7.3.
>From gcc-bugs-return-603716-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 13:30:58 2018
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Subject: [Bug middle-end/85652] New: -Wformat-overflow warning silenced by -fpic/-fPIC
Date: Fri, 04 May 2018 13:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85652
Bug ID: 85652
Summary: -Wformat-overflow warning silenced by -fpic/-fPIC
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Keywords: diagnostic
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Created attachment 44070
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44070&action=edit
testcase
The attached creduce'd testcase warns with -Wformat-overflow:
$ g++-8 -c -O2 -Wformat-overflow t7.cpp
t7.cpp: In function 'void f()':
t7.cpp:15:16: warning: '%s' directive writing up to 55 bytes into a region of
size 12 [-Wformat-overflow=]
t7.cpp:9:10:
return c[d];
~~~~
t7.cpp:15:16:
sprintf(e, "xxxxxxxxxxxx %s / %s", "", g);
^~~~~~~~~~~~~~~~~~~~~~
t7.cpp:15:12: note: 'sprintf' output between 17 and 72 bytes into a destination
of size 28
sprintf(e, "xxxxxxxxxxxx %s / %s", "", g);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
But when -fpic or -fPIC is added, the warning vanishes. Current trunk@259927
shows the same behaviour.
>From gcc-bugs-return-603717-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 13:34:50 2018
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Subject: [Bug middle-end/85652] -Wformat-overflow warning silenced by -fpic/-fPIC
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85652
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I suspect this is due to inlining decision of b::h into f. In PIC mode, b::h
is consider overwritable so it is not inclined while in non pic mode it is
inlined.
>From gcc-bugs-return-603718-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 13:38:19 2018
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Subject: [Bug c++/85651] Invalid -Warray-bounds warning with -O3
Date: Fri, 04 May 2018 13:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85651
--- Comment #1 from Gabriel Burca <gburca-gnu at ebixio dot com> ---
I suspect the "for" loop in appendAux() is being optimized and replaced with a
memcpy(), which then leads to the warning.
>From gcc-bugs-return-603719-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 13:42:03 2018
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85575] Acceptance of invalid code: ordering of declaration statements with implicit typing
Date: Fri, 04 May 2018 13:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85575
--- Comment #5 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Yes, as external function the error is thrown, but not as module procedure.
So do
module foo
implicit none
contains
function quark ...
<declarations>
end function ...
end module ...
This will compile.
>From gcc-bugs-return-603720-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 13:43:42 2018
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Subject: [Bug fortran/85575] Acceptance of invalid code: ordering of declaration statements with implicit typing
Date: Fri, 04 May 2018 13:43:00 -0000
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--- Comment #6 from Jürgen Reuter <juergen.reuter at desy dot de> ---
In addition, it also throws the error
Error: GNU Extension: Symbol ‘sho’ is used before it is typed at (1)
for the case of a contained module procedure with implicit none as in comment
#5.
>From gcc-bugs-return-603721-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 14:13:16 2018
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85653] New: [nvptx] Work around subsequent bar.sync JIT/ptxas bug
Date: Fri, 04 May 2018 14:13:00 -0000
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Bug ID: 85653
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https://gcc.gnu.org/ml/gcc-patches/2018-04/msg01023.html :
...
Hi,
when compiling this testcase with the og7 branch:
...
int
main (void)
{
long long v1;
#pragma acc parallel num_gangs (640) num_workers(1) vector_length (128)
#pragma acc loop
for (v1 = 0; v1 < 20; v1 += 2)
;
return 0;
}
...
this ptx is generated:
...
{
// fork 4;
bar.sync 0;
// forked 4;
// joining 4;
bar.sync 0;
// join 4;
ret;
}
...
This triggers some bug on my quadro m1200 (I'm assuming in the ptxas/JIT
compiler) that hangs the testcase. I can work around this by adding a
membar.cta before the bar.syc, or two membar.ctas inbetween, but I'm not really
sure what a minimal workaround should look like (I reported the bug to nvidia,
I'm hoping for them to answer that question).
...
Nvidia came back confirming the two membar.cta inbetween workaround.
We'll want to implement this, even though this shouldn't be triggering on
either og7 or trunk.
>From gcc-bugs-return-603722-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 14:37:47 2018
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85575] Acceptance of invalid code: ordering of declaration statements with implicit typing
Date: Fri, 04 May 2018 14:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85575
--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Please provide code showing the problem.
>From gcc-bugs-return-603723-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 14:41:11 2018
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85575] Acceptance of invalid code: ordering of declaration statements with implicit typing
Date: Fri, 04 May 2018 14:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85575
--- Comment #8 from Jürgen Reuter <juergen.reuter at desy dot de> ---
module foo
implicit none
contains
function constr_quark_loopline(ho,sho) result(cl)
integer, dimension(sho), intent(in) :: ho
integer, dimension(sho) :: hor
integer, intent(in) :: sho
integer :: cl
end function constr_quark_loopline
end module foo
This compiles with gfortran as a GNU extension, but throws an error (only) with
-std=f2008 etc.
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgomp/85649] [og7, nvptx, openacc] Too much workers chosen for launch
Date: Fri, 04 May 2018 14:53:00 -0000
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=723992575fc42aadaef6b5cab57dcb3ad59b4e0e
:
...
[libgomp, openacc, nvptx] Don't select too many workers
2018-05-04 Tom de Vries <tom@codesourcery.com>
PR libgomp/85649
* plugin/plugin-nvptx.c (MIN, MAX): Redefine.
(nvptx_exec): Choose num_workers such that device has sufficient
resources.
...
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Subject: [Bug tree-optimization/85654] New: gcc.dg/vect/pr85586.c FAILs
Date: Fri, 04 May 2018 15:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85654
Bug ID: 85654
Summary: gcc.dg/vect/pr85586.c FAILs
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: rsandifo at gcc dot gnu.org
Target Milestone: ---
Target: sparc-sun-solaris2.*, powerpc64-unknown-linux-gnu,
ia64-suse-linux-gnu
Created attachment 44071
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44071&action=edit
32-bit sparc-sun-solaris2.11 pr85586.c.161t.vect
The new gcc.dg/vect/pr85586.c test FAILs on Solaris/SPARC (both 32 and 64-bit):
+FAIL: gcc.dg/vect/pr85586.c -flto -ffat-lto-objects scan-tree-dump-times vect
"LOOP VECTORIZED" 1
+FAIL: gcc.dg/vect/pr85586.c scan-tree-dump-times vect "LOOP VECTORIZED" 1
According to gcc-testresults postings, the same failure occurs on Linux/ppc64
and Linux/IA-64.
>From gcc-bugs-return-603726-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 15:05:26 2018
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Subject: [Bug tree-optimization/85654] gcc.dg/vect/pr85586.c FAILs
Date: Fri, 04 May 2018 15:05:00 -0000
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Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|8.0 |9.0
Target Milestone|--- |9.0
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From: "ramana at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85593] [5,6,7,8 Regression] GCC on ARM allocates R3 for local variable when calling naked function with O2 optimizations enabled
Date: Fri, 04 May 2018 15:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85593
Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-04
Version|9.0 |5.4.1
Summary|GCC on ARM allocates R3 for |[5,6,7,8 Regression] GCC on
|local variable when calling |ARM allocates R3 for local
|naked function with O2 |variable when calling naked
|optimizations enabled |function with O2
| |optimizations enabled
Ever confirmed|0 |1
--- Comment #5 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
(In reply to Austin Morton from comment #4)
> In my particular case I was able to work around the issue by removing the
> naked attribute and using extended assembly with a clobbers list.
Removing the naked attribute and using the extended assembler with a clobbers
list is absolutely the correct thing to do.
>
> The resulting code is nearly identical (allowing GCC to generate the correct
> pro/epilog instead of hand writing it), and gcc correctly allocates R4
> instead of R3.
>
> This still feels like a bug in GCC. In the example I gave, if you compiled
> the naked function in a separate C file and linked them it would generate
> the correct code. The issue is that GCC is able to "see" the naked function
> and is performing optimizations that it shouldn't as a result.
>
> I believe that GCC should treat naked functions as opaque as far as
> optimizations are concerned.
> At the very least, there should be a note about this kind of issue included
> in the documentation of the naked attribute.
Yes, it should be opaque as far as this IPA-RA optimization is concerned - I
don't think there are many other optimizations that need to treat this as
opaque. That's what I alluded to in my previous comment
> IIRC there is a hook for ipa-ra that says what
> registers can be clobbered : can't find it immediately. I suppose for naked
> functions it is *all* registers.
I wasn't looking in the backend when I responded earlier, there is no such hook
- I think the correct fix would be to get arm_emit_call_insn to mark *all*
registers as clobbered if the target of the call insn is a naked function i.e.
effectively disabling ipa-ra for naked functions. You'd have to figure out that
the DECL for the target of the call had a "naked" attribute attached to it ...
Do you feel up to writing up a patch assuming you have copyright assignments et
al sewn up ?
>
>
>
> regards
> Ramana
>From gcc-bugs-return-603728-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 15:08:50 2018
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From: "steffen at hauihau dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85655] New: ICE with -flto and -O2 during IPA pass: cp lto1: internal compiler error: Segmentation fault
Date: Fri, 04 May 2018 15:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85655
Bug ID: 85655
Summary: ICE with -flto and -O2 during IPA pass: cp lto1:
internal compiler error: Segmentation fault
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: steffen at hauihau dot de
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Created attachment 44072
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44072&action=edit
reduced testcase
Attached testcase (derived from MariaDB 10.3.6 sql/sys_vars.cc) produces an ICE
with segmenatation fault. -flto with at least -O2 is needed to trigger the ICE.
schlepptop ~ # g++ -flto -O2 /tmp/sys_vars.ii
during IPA pass: cp
lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.gentoo.org/> for instructions.
lto-wrapper: fatal error: /usr/x86_64-pc-linux-gnu/gcc-bin/8.1.0/g++ returned 1
exit status
compilation terminated.
/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../x86_64-pc-linux-gnu/bin/ld:
fatal error: lto-wrapper failed
collect2: error: ld returned 1 exit status
schlepptop ~ # g++ -v
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/8.1.0/g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/8.1.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/home/gentoo/tmp/portage/sys-devel/gcc-8.1.0/work/gcc-8.1.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/8.1.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.1.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.1.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.1.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/include/g++-v8
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/8.1.0/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 8.1.0 p1.0' --disable-esp --enable-libstdcxx-time
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64
--disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj
--enable-libgomp --disable-libmudflap --disable-libssp --disable-libcilkrts
--disable-libmpx --enable-vtable-verify --enable-libvtv --enable-lto
--without-isl --enable-libsanitizer --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 8.1.0 (Gentoo 8.1.0 p1.0)
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Subject: [Bug ipa/85656] New: gcc.dg/ipa/ipa-icf-38.c FAILs
Date: Fri, 04 May 2018 15:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85656
Bug ID: 85656
Summary: gcc.dg/ipa/ipa-icf-38.c FAILs
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
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CC: marxin at gcc dot gnu.org, vries at gcc dot gnu.org
Target Milestone: ---
Target: i?86-pc-solaris2.*, sparc-sun-solaris2.*
The new gcc.dg/ipa/ipa-icf-38.c test FAILs on Solaris/SPARC and x86, both 32
and
64-bit:
+FAIL: gcc.dg/ipa/ipa-icf-38.c scan-ltrans-tree-dump-not fixup_cfg4 "Function
bar"
Unlike e.g. Linux/x86_64, ipa-icf-38.exe.ltrans0.088t.fixup_cfg4 has
;; Function bar (bar, funcdef_no=0, decl_uid=1492, cgraph_uid=0,
symbol_order=3)
__attribute__((noinline))
bar ()
{
<bb 2> [local count: 1073741825]:
return 54;
}
>From gcc-bugs-return-603730-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 15:12:24 2018
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Subject: [Bug target/85616] ARM target using -O2 may cause unaligned access
Date: Fri, 04 May 2018 15:12:00 -0000
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--- Comment #3 from ktkachov at gcc dot gnu.org ---
Though the example code given breaks C's strict aliasing rules, doesn't it?
bug_start is an array of chars (byte-aligned) but the stores to it are done as
ints, which expect word alignment, so this would be invoking undefined
behaviour.
>From gcc-bugs-return-603731-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 16:03:12 2018
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Subject: [Bug ada/85635] typo in link.c for BSD platforms
Date: Fri, 04 May 2018 16:03:00 -0000
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--- Comment #13 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Those "many" people don't build gnat. Very few people do according to the
> testsuite results page.
That's a clear misconception. The Ada compiler is regularly built and tested
on Linux, Darwin, Solaris and Windows. The story is indeed different for BSDs
but they are not representative of the native platforms here.
>From gcc-bugs-return-603732-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 16:06:17 2018
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Subject: [Bug middle-end/38960] Wrong floating point reorder
Date: Fri, 04 May 2018 16:06:00 -0000
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--- Comment #5 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Since any non-const function can examine floating-point state, I'd expect
significant effects on code generation. (Whether this also applies to
asms depends on the architecture; some architectures have a register name
you can use in asm operands to refer to floating-point state, and in those
cases asms reading or writing that state "should" say explicitly that they
do so, but I don't think all architectures have such a name supported by
GCC in asms.)
>From gcc-bugs-return-603733-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 16:10:22 2018
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Subject: [Bug go/85629] GCC 8.1.0: FTBFS: make check fails in Go part
Date: Fri, 04 May 2018 16:10:00 -0000
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--- Comment #2 from Ian Lance Taylor <ian at airs dot com> ---
What are the contents of gotools/cmd_vet-testlog?
>From gcc-bugs-return-603734-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 16:22:51 2018
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Subject: [Bug fortran/85575] Acceptance of invalid code: ordering of declaration statements with implicit typing
Date: Fri, 04 May 2018 16:22:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Severity|normal |enhancement
--- Comment #9 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
AFAICT
(1) The behavior is present even without module: add
implicit none
integer :: cl
to the test in comment 4 and it compiles if -std=f* is not used.
(2) The extension seems to "work" as expected.
(3) The extension is not documented.
How do you expect this PR to be fixed?
(a) Remove the extension (beware benchmarks).
(b) Limit it to codes compiled with -std=legacy.
(c) Document it.
...
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Subject: [Bug ada/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86
Date: Fri, 04 May 2018 16:25:00 -0000
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--- Comment #8 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Another (checking) assertion triggers in fix_up_crossing_landing_pad:
rtx_insn *insn = BB_END (e->src);
rtx note = find_reg_note (insn, REG_EH_REGION, NULL_RTX);
gcc_assert (note != NULL);
gcc_checking_assert (INTVAL (XEXP (note, 0)) == old_lp->index);
Since 2 elements of cfun->eh->lp_array can share the same landing pad, you can
have a different REG_EH_REGION note on one of the edges. I wonder why this
doesn't seem to happen with DWARF-2 exception handling.
>From gcc-bugs-return-603735-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 16:25:01 2018
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Subject: [Bug go/85630] GCC 8.1.0: Filesystem pollution during build: .cache dir in $HOME
Date: Fri, 04 May 2018 16:25:00 -0000
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--- Comment #2 from ian at gcc dot gnu.org <ian at gcc dot gnu.org> ---
Author: ian
Date: Fri May 4 16:23:51 2018
New Revision: 259937
URL: https://gcc.gnu.org/viewcvs?rev=259937&root=gcc&view=rev
Log:
PR go/85630
* Makefile.am (CHECK_ENV): Set GOCACHE.
(ECHO_ENV): Update for setting of GOCACHE.
* Makefile.in: Rebuild.
Modified:
trunk/gotools/ChangeLog
trunk/gotools/Makefile.am
trunk/gotools/Makefile.in
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Subject: [Bug fortran/85575] Acceptance of invalid code: ordering of declaration statements with implicit typing
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--- Comment #10 from Jürgen Reuter <juergen.reuter at desy dot de> ---
(In reply to Dominique d'Humieres from comment #9)
> AFAICT
>
> (1) The behavior is present even without module: add
>
> implicit none
> integer :: cl
>
> to the test in comment 4 and it compiles if -std=f* is not used.
>
> (2) The extension seems to "work" as expected.
>
> (3) The extension is not documented.
>
> How do you expect this PR to be fixed?
>
> (a) Remove the extension (beware benchmarks).
> (b) Limit it to codes compiled with -std=legacy.
> (c) Document it.
> ...
Tough question. Documentation never hurts, so probably yes. Now that you
mentioned that this also works for external functions, I would suppose this was
for backwards compatibility with code developed with g77. I would prefer
gfortran to follow the standard and throw an error without restricting to
-std=fXXXX, and allow the extension only for -std=legacy. But I feel that this
is the responsibility of the developer team to decide on the policy.
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Subject: [Bug target/82518] gfortran.fortran-torture/execute/in-pack.f90 fails on armeb
Date: Fri, 04 May 2018 16:36:00 -0000
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--- Comment #60 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Fri May 4 16:35:32 2018
New Revision: 259940
URL: https://gcc.gnu.org/viewcvs?rev=259940&root=gcc&view=rev
Log:
[arm] PR target/82518: Return false in ARRAY_MODE_SUPPORTED_P for
BYTES_BIG_ENDIAN pt2
Backport from trunk
2018-04-27 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
PR target/82518
* lib/target-supports.exp (check_effective_target_vect_load_lanes):
Use check_effective_target_arm_little_endian.
Modified:
branches/gcc-8-branch/gcc/testsuite/ChangeLog
branches/gcc-8-branch/gcc/testsuite/lib/target-supports.exp
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Subject: [Bug target/85512] [8/9 Regression] gcc generating non-existing sshr with immh == 0
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--- Comment #13 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Fri May 4 16:37:30 2018
New Revision: 259941
URL: https://gcc.gnu.org/viewcvs?rev=259941&root=gcc&view=rev
Log:
[AArch64] PR target/85512: Tighten SIMD right shift immediate constraints pt2
Backport from trunk.
2018-04-27 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
PR target/85512
* config/aarch64/constraints.md (Usg): Limit to 31.
(Usj): Limit to 63.
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/config/aarch64/constraints.md
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Subject: [Bug go/85630] GCC 8.1.0: Filesystem pollution during build: .cache dir in $HOME
Date: Fri, 04 May 2018 17:07:00 -0000
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--- Comment #3 from ian at gcc dot gnu.org <ian at gcc dot gnu.org> ---
Author: ian
Date: Fri May 4 17:07:20 2018
New Revision: 259945
URL: https://gcc.gnu.org/viewcvs?rev=259945&root=gcc&view=rev
Log:
PR go/85630
* Makefile.am (CHECK_ENV): Set GOCACHE.
(ECHO_ENV): Update for setting of GOCACHE.
* Makefile.in: Rebuild.
Modified:
branches/gcc-8-branch/gotools/ChangeLog
branches/gcc-8-branch/gotools/Makefile.am
branches/gcc-8-branch/gotools/Makefile.in
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Subject: [Bug go/85630] GCC 8.1.0: Filesystem pollution during build: .cache dir in $HOME
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Ian Lance Taylor <ian at airs dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Ian Lance Taylor <ian at airs dot com> ---
Fixed.
>From gcc-bugs-return-603742-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri May 04 17:16:43 2018
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From: "xantares09 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ada/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86
Date: Fri, 04 May 2018 17:16:00 -0000
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--- Comment #9 from xantares09 at hotmail dot com ---
Yes, I applied your patch, now the build fails with another error:
gcc -c -I./ -I/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/adalib/../adainclude
-I/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/adalib -I.
-I/home/xantares/projects/aur-scripts/mingw-w64-gcc/src/gcc/gcc/ada -g -O2 -W
-Wall -gnatpg -gnata -I-
/home/xantares/projects/aur-scripts/mingw-w64-gcc/src/gcc-8.1.0/gcc/ada/fmap.adb
fmap.adb:304:18: "Null_FD" is undefined
gnatmake:
"/home/xantares/projects/aur-scripts/mingw-w64-gcc/src/gcc-8.1.0/gcc/ada/fmap.adb"
compilation error
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Subject: [Bug ada/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86
Date: Fri, 04 May 2018 17:32:00 -0000
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--- Comment #10 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Yes, I applied your patch, now the build fails with another error:
This one is yours, you need to compile the 8.1 cross with the 8.1 native.
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Subject: [Bug ada/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86
Date: Fri, 04 May 2018 17:41:00 -0000
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--- Comment #11 from xantares09 at hotmail dot com ---
Oh, ok
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Subject: [Bug fortran/85407] Replace gcc_assert in module.c:read_module by more helpful diagnostics
Date: Fri, 04 May 2018 18:49:00 -0000
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--- Comment #2 from Harald Anlauf <anlauf at gmx dot de> ---
(In reply to Dominique d'Humieres from comment #1)
> The trunk is now at 9.0. The patch can be committed if accepted.
It was my understanding that Steve OK'd it and said that he'd commit,
but then did not.
I do not have commit rights.
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Subject: [Bug go/85629] GCC 8.1.0: FTBFS: make check fails in Go part
Date: Fri, 04 May 2018 18:55:00 -0000
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--- Comment #3 from Stefan <kdevel at vogtner dot de> ---
Created attachment 44073
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44073&action=edit
gotools/cmd_vet-testlog
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Subject: [Bug go/85629] GCC 8.1.0: FTBFS: make check fails in Go part
Date: Fri, 04 May 2018 19:15:00 -0000
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--- Comment #4 from Ian Lance Taylor <ian at airs dot com> ---
Thanks. Which version of which linker are you running? For that matter, which
version of which assembler? I don't see the warnings and errors that you are
seeing, with GNU as 2.30 and GNU gold 2.30.51.20180211.
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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ada/85638] [8/9 regression] build failure for Ada runtime with SJLJ exceptions on x86
Date: Fri, 04 May 2018 19:17:00 -0000
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--- Comment #12 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> I wonder why this doesn't seem to happen with DWARF-2 exception handling.
OK, the difference is that dw2_build_landing_pads does:
lp->landing_pad = gen_label_rtx ();
emit_label (lp->landing_pad);
LABEL_PRESERVE_P (lp->landing_pad) = 1;
whereas sjlj_emit_dispatch_table does:
lp->landing_pad = dispatch_label;
In other words, there is a landing pad per post-landing pad with DWARF-2 and a
common landing pad for all post-landing pads with SJLJ so, when you redirect
the edges from post-landing to landing pads, you lose the 1->1 mapping with
SJLJ.
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Subject: [Bug go/85629] GCC 8.1.0: FTBFS: make check fails in Go part
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--- Comment #5 from Stefan <kdevel at vogtner dot de> ---
(In reply to Ian Lance Taylor from comment #4)
> Which version of which linker are you running?
# ld -v
GNU ld version 2.20.51.0.2-5.47.el6_9.1 20100205
> For that matter, which version of which assembler?
# as -v
GNU assembler version 2.20.51.0.2 (x86_64-redhat-linux) using BFD version
version 2.20.51.0.2-5.47.el6_9.1 20100205
> I don't see the warnings and errors that
> you are seeing, with GNU as 2.30 and GNU gold 2.30.51.20180211.
# cat /etc/redhat-release
CentOS release 6.9 (Final)
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Subject: =?UTF-8?B?W0J1ZyBjKysvODU1ODddIFs4LzkgUmVncmVzc2lvbl0gYm9ndXMgZXJyb3I6?= =?UTF-8?B?IOKAmEbigJkgd2FzIG5vdCBkZWNsYXJlZCBpbiB0aGlzIHNjb3Bl?Date: Fri, 04 May 2018 20:17:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|8.2 |8.0
--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed in 8.1.
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Subject: [Bug c++/85305] Parameter pack expression in lambda capture list fails as part of a fold expression
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--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Fri May 4 20:20:16 2018
New Revision: 259959
URL: https://gcc.gnu.org/viewcvs?rev=259959&root=gcc&view=rev
Log:
PR c++/85305 - pack in lambda init-capture.
* parser.c (cp_parser_initializer): Add subexpression_p parm; don't
check_for_bare_parameter_packs in a subexpression.
(cp_parser_lambda_introducer): Use it.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/cpp1z/fold-lambda2.C
Modified:
branches/gcc-8-branch/gcc/cp/ChangeLog
branches/gcc-8-branch/gcc/cp/parser.c
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Subject: [Bug c++/85305] Parameter pack expression in lambda capture list fails as part of a fold expression
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for 8.2.
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Subject: [Bug fortran/85407] Replace gcc_assert in module.c:read_module by more helpful diagnostics
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kargl at gcc dot gnu.org changed:
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CC| |kargl at gcc dot gnu.org
--- Comment #3 from kargl at gcc dot gnu.org ---
(In reply to Harald Anlauf from comment #2)
> (In reply to Dominique d'Humieres from comment #1)
> > The trunk is now at 9.0. The patch can be committed if accepted.
>
> It was my understanding that Steve OK'd it and said that he'd commit,
> but then did not.
>
Yeah, I'll get around to it when I have some free time.
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Subject: [Bug target/85657] New: Make __ibm128 a separate type, even if long double uses the IBM double-double format
Date: Fri, 04 May 2018 21:04:00 -0000
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Bug ID: 85657
Summary: Make __ibm128 a separate type, even if long double
uses the IBM double-double format
Product: gcc
Version: 9.0
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Part of the issue with PR target/85075 is that the __ibm128 type was
implemented internally as long double, when the long double type is IBM
double-double (i.e. the same bit representation as __ibm128).
Once __ibm128 is a separate type, then the restriction against not using
-mlong-double-64 with __ibm128 goes away.
Finally, there should a version of pack and unpack that targets __ibm128 as
well.
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Subject: [Bug target/85657] Make __ibm128 a separate type, even if long double uses the IBM double-double format
Date: Fri, 04 May 2018 21:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85657
Michael Meissner <meissner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-04
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
Assignee|unassigned at gcc dot gnu.org |meissner at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> ---
Note, this needs to go into GCC 9 and back ported to 8.2 to allow the migration
of long double from the IBM double-double format to IEEE 128-bit.
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Subject: [Bug driver/85658] New: gcc-8.0.1 stopped validating --with-arch= flag
Date: Fri, 04 May 2018 22:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85658
Bug ID: 85658
Summary: gcc-8.0.1 stopped validating --with-arch= flag
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: slyfox at inbox dot ru
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[ How I have found this bug: Gentoo uses gcc/config.gcc (as a hack) to validate
--with-arch= option. ]
Actual bug: gcc-8.0.1:
$ awk -f gcc-8.1.0/gcc/config/arm/parsecpu.awk -v 'cmd=chkarch arm'
gcc-8.1.0/gcc/config/arm/arm-cpus.in
arm
$ awk -f gcc-8.1.0/gcc/config/arm/parsecpu.awk -v 'cmd=chkarch armv7'
gcc-8.1.0/gcc/config/arm/arm-cpus.in
armv7
$ awk -f gcc-8.1.0-r1/work/gcc-8.1.0/gcc/config/arm/parsecpu.awk -v
'cmd=chkarch not-a-cpu' gcc-8.1.0/gcc/config/arm/arm-cpus.in
not-a-cpu
Note: script never returns errors and proceeds compiling gcc even though gcc
does not support -march=arm.
How it used to work in gcc-7.3.0:
$ awk -f gcc-7.3.0/gcc/config/arm/parsecpu.awk -v 'cmd=chkarch arm'
gcc-7.3.0/gcc/config/arm/arm-cpus.in
error
$ awk -f gcc-7.3.0/gcc/config/arm/parsecpu.awk -v 'cmd=chkarch armv7'
gcc-7.3.0/gcc/config/arm/arm-cpus.in
armv7
Can arch validation be restored to return 'error' when bad CPU is passed?
Thanks!
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Subject: [Bug bootstrap/85658] gcc-8.0.1 stopped validating --with-arch= flag
Date: Fri, 04 May 2018 22:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85658
--- Comment #1 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Looks like the bug is in operator precedence in awk between '!' and 'in'.
This makes above tests to recover:
diff --git a/gcc/config/arm/parsecpu.awk b/gcc/config/arm/parsecpu.awk
index 56c762b3b..1135f735b 100644
--- a/gcc/config/arm/parsecpu.awk
+++ b/gcc/config/arm/parsecpu.awk
@@ -485,7 +485,7 @@ function check_fpu (name) {
function check_arch (name) {
exts = split (name, extensions, "+")
- if (! extensions[1] in arch_isa) {
+ if (! (extensions[1] in arch_isa)) {
return "error"
}
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Subject: [Bug bootstrap/85658] gcc-8.0.1 stopped validating --with-arch= flag
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--- Comment #2 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Created attachment 44074
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44074&action=edit
93_all_arm-arch.patch
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From: "ldionne.2 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85659] New: ICE with inline assembly inside virtual function
Date: Sat, 05 May 2018 00:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85659
Bug ID: 85659
Summary: ICE with inline assembly inside virtual function
Product: gcc
Version: 6.1.0
Status: UNCONFIRMED
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Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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The following program causes an ICE with GCC 6.1.0 and up. GCC 5.5.0 compiles
this fine.
==============================================================================
#include <string>
template <class Tp>
void DoNotOptimize(Tp& value) {
asm volatile("" : "+m,r"(value) : : "memory");
}
struct base {
virtual void f1() = 0;
};
template <typename T>
struct derived : base {
void f1() override { ::DoNotOptimize(value_); }
T value_;
};
template struct derived<std::string>;
int main() { }
==============================================================================
The exact error given by GCC trunk is:
==============================================================================
during RTL pass: expand
prog.cc: In function 'void DoNotOptimize(Tp&) [with Tp =
std::__cxx11::basic_string<char>]':
prog.cc:5:48: internal compiler error: in assign_temp, at function.c:977
asm volatile("" : "+m,r"(value) : : "memory");
^
0x59887a assign_temp(tree_node*, int, int)
../../source/gcc/function.c:977
0x7a5bde expand_asm_stmt
../../source/gcc/cfgexpand.c:3083
0x7aa007 expand_gimple_stmt_1
../../source/gcc/cfgexpand.c:3621
0x7aa007 expand_gimple_stmt
../../source/gcc/cfgexpand.c:3790
0x7ab7af expand_gimple_basic_block
../../source/gcc/cfgexpand.c:5819
0x7b0866 execute
../../source/gcc/cfgexpand.c:6425
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 is especially problematic as this code was reduced from a benchmark
written using the widely used GoogleBenchmark library. This is where
DoNotOptimize comes from -- I don't write inline assembly myself.
Live examples:
GCC 5.5.0 (works): https://wandbox.org/permlink/bVzSwbSlkoDy5vBt
GCC 6.1.0 (fails): https://wandbox.org/permlink/hgUJL0aEH8MDQgI1
GCC 6.3.0 (fails): https://wandbox.org/permlink/5qhSFDvLzsrmsVrT
GCC 7.3.0 (fails): https://wandbox.org/permlink/uNdVyOlaPUWhxPec
GCC 8.1.0 (fails): https://wandbox.org/permlink/qburemRl1AcqmaVl
GCC trunk (fails): https://wandbox.org/permlink/WcDrgDL9g4YLKsGN
>From gcc-bugs-return-603760-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat May 05 03:26:12 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85618] [8/9 Regression] Zero initialized non constant stack array causes internal compile error
Date: Sat, 05 May 2018 03:26:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org
--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
This doesn't look like a front end issue, as the temporary that is missing its
RTL is introduced during gimplify_type_sizes.
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From: "security-tps at google dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug demangler/85660] New: Signed Integer Overflow (79257474)
Date: Sat, 05 May 2018 04:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85660
Bug ID: 85660
Summary: Signed Integer Overflow (79257474)
Product: gcc
Version: unknown
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Created attachment 44075
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44075&action=edit
proof of concept
Hello,
As part of our fuzzing efforts at Google, we have identified an issue affecting
binutils (tested with revision * master
4e6fe7477a4e9260777cbaa01f70df7ae5f063bb).
To reproduce, we are attaching a Dockerfile which compiles the project with
LLVM, taking advantage of the sanitizers that it offers. More information about
how to use the attached Dockerfile can be found here:
https://docs.docker.com/engine/reference/builder/
Instructions:
`unzip artifacts_79257474.zip`
`docker build --build-arg SANITIZER=undefined --tag=autofuzz-binutils-79257474
autofuzz_79257474`
`docker run --entrypoint /fuzzing/repro.sh --cap-add=SYS_PTRACE -v
$PWD/autofuzz_79257474/poc-7c8bacd8e3b958d37b7a4c80eb649af20e1eae6828f838d518a18781c03c438a_min:/tmp/poc
autofuzz-binutils-79257474 "" /tmp/poc`
`docker run --cap-add=SYS_PTRACE -v
$PWD/autofuzz_79257474/poc-7c8bacd8e3b958d37b7a4c80eb649af20e1eae6828f838d518a18781c03c438a_min:/tmp/poc
-it autofuzz-binutils-79257474`
Alternatively, and depending on the bug, you could use gcc, valgrind or other
instrumentation tools to aid in the investigation. The sanitizer error that we
encountered is here:
```
INFO: Seed: 1481494163
INFO: Loaded 0 modules (0 guards):
/fuzzing/binutils-gdb/build/demangle_fuzzer: Running 1 inputs 500 time(s) each.
Running:
/tmp/poc-7c8bacd8e3b958d37b7a4c80eb649af20e1eae6828f838d518a18781c03c438a
/fuzzing/binutils-gdb/libiberty/cplus-dem.c:3597:10: runtime error: signed
integer overflow: 666666616 * 10 cannot be represented in type 'int'
#0 0x4332c3 in get_count
/fuzzing/binutils-gdb/libiberty/cplus-dem.c:3597:10
#1 0x42d0bd in do_type /fuzzing/binutils-gdb/libiberty/cplus-dem.c:3874:12
#2 0x4319f4 in demangle_template
/fuzzing/binutils-gdb/libiberty/cplus-dem.c:2300:14
#3 0x43027a in demangle_signature
/fuzzing/binutils-gdb/libiberty/cplus-dem.c:1628:14
#4 0x42e864 in internal_cplus_demangle
/fuzzing/binutils-gdb/libiberty/cplus-dem.c:1257:14
#5 0x42d990 in cplus_demangle
/fuzzing/binutils-gdb/libiberty/cplus-dem.c:918:9
#6 0x42bf02 in LLVMFuzzerTestOneInput
/fuzzing/security-research-pocs/autofuzz/demangle_fuzzer.cc:11:21
#7 0x4557ee in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*,
unsigned long) (/fuzzing/binutils-gdb/build/demangle_fuzzer+0x4557ee)
#8 0x44a93e in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned
long) (/fuzzing/binutils-gdb/build/demangle_fuzzer+0x44a93e)
#9 0x44ee47 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char
const*, unsigned long)) (/fuzzing/binutils-gdb/build/demangle_fuzzer+0x44ee47)
#10 0x44a65b in main (/fuzzing/binutils-gdb/build/demangle_fuzzer+0x44a65b)
#11 0x7f090766c2e0 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x202e0)
#12 0x406a69 in _start
(/fuzzing/binutils-gdb/build/demangle_fuzzer+0x406a69)
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
/fuzzing/binutils-gdb/libiberty/cplus-dem.c:3597:10 in
```
We will gladly work with you so you can successfully confirm and reproduce this
issue. Do let us know if you have any feedback surrounding the documentation.
Once you have reproduced the issue, we'd appreciate to learn your expected
timeline for an update to be released. With any fix, please attribute the
report
to "Google Autofuzz project".
We are also pleased to inform you that your project is eligible for inclusion
to
the OSS-Fuzz project, which can provide additional continuous fuzzing, and
encourage you to investigate integration options.
Don't hesitate to let us know if you have any questions!
Google AutoFuzz Team
>From gcc-bugs-return-603762-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat May 05 04:54:30 2018
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From: "manuel.serrano at inria dot fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85661] New: double comparison illegally statically reduced
Date: Sat, 05 May 2018 04:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85661
Bug ID: 85661
Summary: double comparison illegally statically reduced
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: manuel.serrano at inria dot fr
Target Milestone: ---
Double comparisons are sometime erroneously resolved by the compiler. Let's us
consider the following C code:
% cat bar.c
int BGl_testz00zzbugz002(double BgL_lhs1029z00_4) {
double BgL_tmpz00_1191 = BgL_lhs1029z00_4 * ((double) 0.1);
return (((double) 0.0) == BgL_tmpz00_1191);
}
The generated assembly code is:
% gcc -v -O1 -c bar.c -S
% cat bar.s
.file "bar.c"
.text
.globl BGl_testz00zzbugz002
.type BGl_testz00zzbugz002, @function
BGl_testz00zzbugz002:
.LFB0:
.cfi_startproc
call __x86.get_pc_thunk.ax
addl $_GLOBAL_OFFSET_TABLE_, %eax
fldl .LC0@GOTOFF(%eax)
fmull 4(%esp)
fldz
fucomip %st(1), %st
fstp %st(0)
setnp %al
movzbl %al, %eax
movl $0, %edx
cmovne %edx, %eax
ret
.cfi_endproc
.LFE0:
.size BGl_testz00zzbugz002, .-BGl_testz00zzbugz002
.section .rodata.cst8,"aM",@progbits,8
.align 8
.LC0:
.long -1717986918
.long 1069128089
.section
.text.__x86.get_pc_thunk.ax,"axG",@progbits,__x86.get_pc_thunk.ax,comdat
.globl __x86.get_pc_thunk.ax
.hidden __x86.get_pc_thunk.ax
.type __x86.get_pc_thunk.ax, @function
__x86.get_pc_thunk.ax:
.LFB1:
.cfi_startproc
movl (%esp), %eax
ret
.cfi_endproc
.LFE1:
.ident "GCC: (Debian 7.3.0-17) 7.3.0"
.section .note.GNU-stack,"",@progbits
As far I understand it, BGl_testz00zzbugz002 always returns 0, even is
called with 5e-324 (min double value) which yields the multiplication to
return 0.
Now, lets modify the function for:
#include <stdio.h>
int BGl_testz00zzbugz002(double BgL_lhs1029z00_4) {
double BgL_tmpz00_1191 = BgL_lhs1029z00_4 * ((double) 0.1);
fprintf( stderr, "FOO\n" );
return (((double) 0.0) == BgL_tmpz00_1191);
}
That is, let's just add a call to fprintf before the return statement.
The generated assembly code is now correct:
% gcc -v -O1 -c bar.c -S
% cat bar.s
.file "bar.c"
.text
.section .rodata.str1.1,"aMS",@progbits,1
.LC0:
.string "FOO\n"
.text
.globl BGl_testz00zzbugz002
.type BGl_testz00zzbugz002, @function
BGl_testz00zzbugz002:
.LFB11:
.cfi_startproc
pushl %ebx
.cfi_def_cfa_offset 8
.cfi_offset 3, -8
subl $24, %esp
.cfi_def_cfa_offset 32
call __x86.get_pc_thunk.bx
addl $_GLOBAL_OFFSET_TABLE_, %ebx
fldl 32(%esp)
fstpl 8(%esp)
movl stderr@GOT(%ebx), %eax
pushl (%eax)
.cfi_def_cfa_offset 36
pushl $4
.cfi_def_cfa_offset 40
pushl $1
.cfi_def_cfa_offset 44
leal .LC0@GOTOFF(%ebx), %eax
pushl %eax
.cfi_def_cfa_offset 48
call fwrite@PLT
fldl .LC1@GOTOFF(%ebx)
fmull 24(%esp)
fldz
fucomip %st(1), %st
fstp %st(0)
setnp %al
movzbl %al, %eax
movl $0, %edx
cmovne %edx, %eax
addl $40, %esp
.cfi_def_cfa_offset 8
popl %ebx
.cfi_restore 3
.cfi_def_cfa_offset 4
ret
.cfi_endproc
.LFE11:
.size BGl_testz00zzbugz002, .-BGl_testz00zzbugz002
.section .rodata.cst8,"aM",@progbits,8
.align 8
.LC1:
.long -1717986918
.long 1069128089
.section
.text.__x86.get_pc_thunk.bx,"axG",@progbits,__x86.get_pc_thunk.bx,comdat
.globl __x86.get_pc_thunk.bx
.hidden __x86.get_pc_thunk.bx
.type __x86.get_pc_thunk.bx, @function
__x86.get_pc_thunk.bx:
.LFB12:
.cfi_startproc
movl (%esp), %ebx
ret
.cfi_endproc
.LFE12:
.ident "GCC: (Debian 7.3.0-17) 7.3.0"
.section .note.GNU-stack,"",@progbits
Here are the other informations you ask to provide when filling a bug report.
% gcc -v -O1 -c bar.c -S -save-temps
Using built-in specs.
COLLECT_GCC=gcc
Target: i686-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 7.3.0-17'
--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/i686-linux-gnu-as
--with-ld=/usr/bin/i686-linux-gnu-ld --program-suffix=-7
--program-prefix=i686-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-targets=all --enable-multiarch --disable-werror --with-arch-32=i686
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-checking=release --build=i686-linux-gnu --host=i686-linux-gnu
--target=i686-linux-gnu
Thread model: posix
gcc version 7.3.0 (Debian 7.3.0-17)
COLLECT_GCC_OPTIONS='-v' '-O1' '-c' '-S' '-save-temps' '-mtune=generic'
'-march=i686'
/usr/lib/gcc/i686-linux-gnu/7/cc1 -E -quiet -v -imultiarch i386-linux-gnu
bar.c -mtune=generic -march=i686 -O1 -fpch-preprocess -o bar.i
ignoring nonexistent directory "/usr/local/include/i386-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/i686-linux-gnu/7/../../../../i686-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/i686-linux-gnu/7/include
/usr/local/include
/usr/lib/gcc/i686-linux-gnu/7/include-fixed
/usr/include/i386-linux-gnu
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-O1' '-c' '-S' '-save-temps' '-mtune=generic'
'-march=i686'
/usr/lib/gcc/i686-linux-gnu/7/cc1 -fpreprocessed bar.i -quiet -dumpbase bar.c
-mtune=generic -march=i686 -auxbase bar -O1 -version -o bar.s
GNU C11 (Debian 7.3.0-17) version 7.3.0 (i686-linux-gnu)
compiled by GNU C version 7.3.0, 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 C11 (Debian 7.3.0-17) version 7.3.0 (i686-linux-gnu)
compiled by GNU C version 7.3.0, 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: 0871246de3664cbf1722cc29275b2ed4
COMPILER_PATH=/usr/lib/gcc/i686-linux-gnu/7/:/usr/lib/gcc/i686-linux-gnu/7/:/usr/lib/gcc/i686-linux-gnu/:/usr/lib/gcc/i686-linux-gnu/7/:/usr/lib/gcc/i686-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/i686-linux-gnu/7/:/usr/lib/gcc/i686-linux-gnu/7/../../../i386-linux-gnu/:/usr/lib/gcc/i686-linux-gnu/7/../../../../lib/:/lib/i386-linux-gnu/:/lib/../lib/:/usr/lib/i386-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/i686-linux-gnu/7/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-O1' '-c' '-S' '-save-temps' '-mtune=generic'
'-march=i686'
% cat bar.i
# 1 "bar.c"
# 1 "<built-in>"
# 1 "<command-line>"
# 31 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 32 "<command-line>" 2
# 1 "bar.c"
int BGl_testz00zzbugz002(double BgL_lhs1029z00_4) {
double BgL_tmpz00_1191 = BgL_lhs1029z00_4 * ((double) 0.1);
return (((double) 0.0) == BgL_tmpz00_1191);
}
Finally, the GCC version I use the is only currently available under
Debian/Testing executed on a Linux x86 box.
% gcc --version
gcc (Debian 7.3.0-17) 7.3.0
Copyright (C) 2017 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.
Please, let me know if this bug report is not sufficient for you to understand
what's going on and if you need anything else.
Thanks in advance for your help.
--
Manuel
ps: You might object that running exact comparison of double is meaningless,
this bug shows up when running the ECMAScript compliance
test with my JavaScript->C compiler. The original JavaScript test is:
% cat S11.5.1_A4_T7.js
/**
* The result of a floating-point multiplication is governed by the rules of
IEEE 754 double-precision arithmetics
*
* @path ch11/11.5/11.5.1/S11.5.1_A4_T7.js
* @description If the magnitude is too small to represent, the result is then
a zero of appropriate sign
*/
//CHECK#1
if (Number.MIN_VALUE * 0.1 !== 0) {
$ERROR('#1: Number.MIN_VALUE * 0.1 === 0. Actual: ' + (Number.MIN_VALUE *
0.1));
}
//CHECK#2
if (-0.1 * Number.MIN_VALUE !== -0) {
$ERROR('#2.1: -0.1 * Number.MIN_VALUE === -0. Actual: ' + (-0.1 *
Number.MIN_VALUE));
} else {
if (1 / (-0.1 * Number.MIN_VALUE) !== Number.NEGATIVE_INFINITY) {
$ERROR('#2.2: -0.1 * Number.MIN_VALUE === -0. Actual: +0');
}
}
...
>From gcc-bugs-return-603763-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat May 05 05:20:08 2018
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From: "roland at gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85662] New: regression since 6: "error: non-constant condition for static assertion" from __builtin_offsetof in C++
Date: Sat, 05 May 2018 05:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85662
Bug ID: 85662
Summary: regression since 6: "error: non-constant condition for
static assertion" from __builtin_offsetof in C++
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Reporter: roland at gnu dot org
CC: msebor at gcc dot gnu.org
Target Milestone: ---
This code was accepted by GCC 6 but is rejected by GCC 7, 8, and trunk.
The error message appears to complain that the result of the __builtin_offsetof
expression has pointer type rather than size_t.
$ cat foo.cc
struct foo {
unsigned long x[31];
};
struct bar {
bool b;
foo f;
};
static_assert(__builtin_offsetof(bar, f.x[31 - 1]) == 8 + ((31 - 1) * 8), "");
$ ./gcc/xgcc -Bgcc/ -O2 -S foo.cc
foo.cc:10:52: error: non-constant condition for static assertion
static_assert(__builtin_offsetof(bar, f.x[31 - 1]) == 8 + ((31 - 1) * 8), "");
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:10:52: error: value ‘8’ of type ‘bar*’ is not a constant expression
[Exit 1]
The equivalent C code:
struct foo {
unsigned long x[31];
};
struct bar {
_Bool b;
struct foo f;
};
_Static_assert(__builtin_offsetof(struct bar, f.x[31 - 1]) == 8 + ((31 - 1) *
8), "");
is accepted without complaint.
bisected to r238909 (git cb7688247fdcff08df18baed1317fce5b0e9db13)
gcc/cp/ChangeLog
2016-07-30 Martin Sebor <msebor@redhat.com>
PR c++/60760
PR c++/71091
* constexpr.c (cxx_eval_binary_expression): Reject invalid expressions
involving null pointers.
(cxx_eval_component_reference): Reject null pointer dereferences.
(cxx_eval_indirect_ref): Reject indirecting through null pointers.
(cxx_eval_constant_expression): Reject invalid expressions involving
null pointers.
>From gcc-bugs-return-603764-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat May 05 07:25:29 2018
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Subject: [Bug rtl-optimization/85645] ICE in maybe_record_trace_start, at dwarf2cfi.c:2348
Date: Sat, 05 May 2018 07:25:00 -0000
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--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Started at r259672.
>From gcc-bugs-return-603765-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat May 05 07:52:44 2018
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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++/85662] [8/9 Regression] "error: non-constant condition for static assertion" from __builtin_offsetof in C++
Date: Sat, 05 May 2018 07:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85662
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-05-05
CC| |jakub at gcc dot gnu.org
Version|unknown |8.0
Target Milestone|--- |8.2
Summary|regression since 6: "error: |[8/9 Regression] "error:
|non-constant condition for |non-constant condition for
|static assertion" from |static assertion" from
|__builtin_offsetof in C++ |__builtin_offsetof in C++
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Weird, I can only reproduce it starting with r247495 and can't reproduce with
gcc 7.
Better testcase that doesn't really depend on the actual structure layout and
sizes:
struct S { unsigned long x[31]; };
struct T { bool b; S f; };
static_assert (__builtin_offsetof (T, f.x[31 - 1]) == __builtin_offsetof (T,
f.x[30]), "");
Using 30 instead of 31-1 makes it go away, and the problem is that something
creates or keeps around 8 as pointer constant.
>From gcc-bugs-return-603766-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat May 05 07:56:59 2018
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Subject: [Bug target/85653] [nvptx] Work around subsequent bar.sync JIT/ptxas bug
Date: Sat, 05 May 2018 07:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85653
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Sat May 5 07:56:21 2018
New Revision: 259967
URL: https://gcc.gnu.org/viewcvs?rev=259967&root=gcc&view=rev
Log:
[nvptx] Add workaround for subsequent bar.syncs
2018-05-05 Tom de Vries <tom@codesourcery.com>
PR target/85653
* config/nvptx/nvptx.c (WORKAROUND_PTXJIT_BUG_3): Define.
(workaround_barsyncs): New function.
(nvptx_reorg): Use workaround_barsyncs.
* config/nvptx/nvptx.md (define_c_enum "unspecv"): Add UNSPECV_MEMBAR.
(define_expand "nvptx_membar_cta"): New define_expand.
(define_insn "*nvptx_membar_cta"): New insn.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/nvptx/nvptx.c
trunk/gcc/config/nvptx/nvptx.md
>From gcc-bugs-return-603767-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat May 05 08:17:53 2018
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Subject: [Bug c++/85662] [8/9 Regression] "error: non-constant condition for static assertion" from __builtin_offsetof in C++
Date: Sat, 05 May 2018 08:17:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
In any case, I think the problem is related to the delayed folding, C++
constexpr handling not liking pointer constants and fold_offsetof_1 done as
pointer addition rather than integer addition. With delayed folding and
fold_build_pointer_plus called by fold_offsetof_1 the nested expressions aren't
really folded. We could easily fix it up by doing a cp_fold (together with
recursive cp_fold_r though, because cp_fold isn't fully recursive) on the
result of fold_offsetof in the C++ FE, that way we'd get a constant whenever
possible.
On the other side, we wouldn't then reject __builtin_offsetof used with not
valid constexpr expressions in the second argument (say out of bound array
access etc. subtracted from itself).
Say:
constexpr int a[5];
struct S { int b, c[5]; };
constexpr int d = __builtin_offsetof (S, c[(&a[6] - &a[6]) + 2]);
Another possibility is in fold_offsetof_1, if we detect the TREE_CONSTANT base,
if it is a pointer typed INTEGER_CST, build corresponding sizetype INTEGER_CST
instead and use normal PLUS_EXPR folding (or do we actually want any folding at
all?) instead of fold_build_pointer_plus.
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Subject: [Bug target/85653] [nvptx] Work around subsequent bar.sync JIT/ptxas bug
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Tom de Vries <vries at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
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--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Patch committed to trunk and backported to og7 branch, marking resolved-fixed.
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Subject: [Bug target/85653] [nvptx] Work around subsequent bar.sync JIT/ptxas bug
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----------------------------------------------------------------------------
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