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* [Bug rtl-optimization/85393] [8 Regression] Miscompilation with hot/cold partitioning starting with r254832
[not found] <bug-85393-4@http.gcc.gnu.org/bugzilla/>
@ 2018-04-13 12:03 ` jakub at gcc dot gnu.org
0 siblings, 0 replies; only message in thread
From: jakub at gcc dot gnu.org @ 2018-04-13 12:03 UTC (permalink / raw)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85393
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Ah, it is the pre pass already, in the dump it dumps the function with (set
(reg:DI 108) (plus:DI (frame) (const_int -64))) and later on with (set (reg:DI
108) (reg:DI 123)), but the latter is incorrect.
>From gcc-bugs-return-601537-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 12:09:37 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85393] [8 Regression] Miscompilation with hot/cold partitioning starting with r254832
Date: Fri, 13 Apr 2018 12:09:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Index 6 (hash value 34; max distance 0)
(plus:DI (reg/f:DI 20 frame)
(const_int -64 [0xffffffffffffffc0]))
scanning new insn with uid = 160.
deleting insn with uid = 117.
PRE: redundant insn 117 (expression 6) in bb 25, reaching reg is 123
scanning new insn with uid = 161.
deleting insn with uid = 74.
PRE: redundant insn 74 (expression 6) in bb 13, reaching reg is 123
PRE: edge (8,13), copy expression 6
PRE: edge (15,24), copy expression 6
PRE: edge (17,24), copy expression 6
PRE: edge (23,24), copy expression 6
>From gcc-bugs-return-601538-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 12:16:00 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++/84733] [8 Regression] internal compiler error: Segmentation fault (check_local_shadow())
Date: Fri, 13 Apr 2018 12:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84733
--- Comment #9 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Indeed, Nathan, at some point I had that too. Or even seen_error () which we
often use lately in such cases. If nobody objects I'll send a patchlet +
testcase.
>From gcc-bugs-return-601539-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 12:20:05 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] ICE in verify_target_availability, at sel-sched.c:1569
Date: Fri, 13 Apr 2018 12:20:00 -0000
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--- Comment #3 from Arseny Solokha <asolokha at gmx dot com> ---
Here's another one:
long long int
xa (long long int ae, int yr)
{
long long int b3 = ae / (!ae + 2);
long long int mx = yr + 1.0;
long long int em = 1 / mx / (yr + 2.0);
return b3 + em;
}
% powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20180408 -mcpu=power8 -O2
-fselective-scheduling2 -fno-tree-ter -c xqrerdpm.c
during RTL pass: sched2
xqrerdpm.c: In function 'xa':
xqrerdpm.c:9:1: internal compiler error: in verify_target_availability, at
sel-sched.c:1569
}
^
0xc141e6 verify_target_availability
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sel-sched.c:1566
0xc141e6 find_best_reg_for_expr
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sel-sched.c:1679
0xc141e6 fill_vec_av_set
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sel-sched.c:3797
0xc14960 fill_ready_list
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sel-sched.c:4027
0xc14960 find_best_expr
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sel-sched.c:4387
0xc14960 fill_insns
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sel-sched.c:5544
0xc16d7e schedule_on_fences
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sel-sched.c:7361
0xc16d7e sel_sched_region_2
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sel-sched.c:7499
0xc19581 sel_sched_region_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sel-sched.c:7541
0xc19581 sel_sched_region(int)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sel-sched.c:7642
0xc19c51 run_selective_scheduling()
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sel-sched.c:7718
0xbf0abd rest_of_handle_sched2
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sched-rgn.c:3729
0xbf0abd execute
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180408/work/gcc-8-20180408/gcc/sched-rgn.c:3873
gcc ICEs on both w/ -mcpu=power8, power9, and powerpc64le.
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Subject: [Bug libgcc/85388] config/i386/morestack.S is incompatible with CET
Date: Fri, 13 Apr 2018 12:40:00 -0000
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--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
This works:
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 03e5c433574..324e2ec60fc 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -15242,7 +15242,13 @@ ix86_expand_split_stack_prologue (void)
instruction--we need control flow to continue at the subsequent
label. Therefore, we use an unspec. */
gcc_assert (crtl->args.pops_args < 65536);
- emit_insn (gen_split_stack_return (GEN_INT (crtl->args.pops_args)));
+ rtx_insn *ret_insn
+ = emit_insn (gen_split_stack_return (GEN_INT (crtl->args.pops_args)));
+ if ((flag_cf_protection & CF_BRANCH) && TARGET_IBT)
+ {
+ rtx cet_eb = gen_nop_endbr ();
+ emit_insn_after (cet_eb, ret_insn);
+ }
/* If we are in 64-bit mode and this function uses a static chain,
we saved %r10 in %rax before calling _morestack. */
>From gcc-bugs-return-601541-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 12:51:08 2018
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Subject: [Bug target/85388] Missing ENDBR after __morestack call
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-13
Component|libgcc |target
Summary|config/i386/morestack.S is |Missing ENDBR after
|incompatible with CET |__morestack call
Ever confirmed|0 |1
>From gcc-bugs-return-601542-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 12:55:36 2018
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Subject: [Bug target/85388] Missing ENDBR after __morestack call
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--- Comment #5 from igor.v.tsimbalist at intel dot com ---
I think it's the right place.
>From gcc-bugs-return-601543-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 13:15:41 2018
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/85393] [8 Regression] Miscompilation with hot/cold partitioning starting with r254832
Date: Fri, 13 Apr 2018 13:15:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I used gcc 8 headers when bisecting it. And commenting out
+ /* Do not expect profile insanities when profile was not adjusted. */
+ if (e->probability == profile_probability::never ()
+ || e->count == profile_count::zero ())
+ continue;
+
helped. I saw differences in .bbpart so I thought something went wrong in
hot/cold partitioning.
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Subject: [Bug rtl-optimization/85393] [8 Regression] Miscompilation with hot/cold partitioning starting with r254832
Date: Fri, 13 Apr 2018 13:22:00 -0000
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Actually, PRE does the right thing; the ~S () call is in bb3 and there is EH
edge from there to bb23, which has another EH predecessor, and PRE inserts the
initialization of pseudo 123 in that bb23. Then comes bbpart, determines that
one of the EH edges is crossing and duplicates the bb (.gcc_except_table
contains expressions relative to the start of the partition in the current
function, so EH edges need to be non-crossing). The pseudo 123 initialization
is not duplicated though. So, likely bbpart bug then.
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Subject: [Bug rtl-optimization/85393] [8 Regression] Miscompilation with hot/cold partitioning starting with r254832
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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> ---
Ok, it is the fix_up_crossing_landing_pad function that is buggy.
It simply assumes that a landing pad basic block contains only the landing pad
instructions and nothing else; as this testcase proves, it is a wrong
assumption.
Either we could really duplicate the bb, or, IMHO better, instead of partially
duplicating it just emit a label and jump (cross partition) to the existing
landing pad.
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Subject: [Bug rtl-optimization/85393] [8 Regression] Miscompilation with hot/cold partitioning starting with r254832
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43926
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43926&action=edit
gcc8-pr85393.patch
Untested fix.
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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Subject: [Bug sanitizer/85394] New: Unable to run sanitized executables on ppc64le Ubuntu and SLES
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Bug ID: 85394
Summary: Unable to run sanitized executables on ppc64le Ubuntu
and SLES
Product: gcc
Version: unknown
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Severity: normal
Priority: P3
Component: sanitizer
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See external bug
https://github.com/google/sanitizers/issues/933
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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Subject: [Bug sanitizer/85394] Unable to run sanitized executables on ppc64le Ubuntu and SLES
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fedora too.
>From gcc-bugs-return-601551-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 14:33:17 2018
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Subject: [Bug sanitizer/85394] [8 Regression] Unable to run sanitized executables on ppc64le Ubuntu and SLES
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-13
Version|unknown |8.0
Target Milestone|--- |8.0
Summary|Unable to run sanitized |[8 Regression] Unable to
|executables on ppc64le |run sanitized executables
|Ubuntu and SLES |on ppc64le Ubuntu and SLES
Ever confirmed|0 |1
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Subject: [Bug sanitizer/85394] [8 Regression] Unable to run sanitized executables on ppc64le Ubuntu and SLES
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- libsanitizer/asan/asan_allocator.h 2017-10-19 13:20:58.926958939 +0200
+++ libsanitizer/asan/asan_allocator.h 2018-04-13 00:24:53.331985820 +0200
@@ -122,7 +122,7 @@ const uptr kAllocatorSpace = ~(uptr)0;
const uptr kAllocatorSize = 0x40000000000ULL; // 4T.
typedef DefaultSizeClassMap SizeClassMap;
# elif defined(__powerpc64__)
-const uptr kAllocatorSpace = 0xa0000000000ULL;
+const uptr kAllocatorSpace = ~(uptr)0;
const uptr kAllocatorSize = 0x20000000000ULL; // 2T.
typedef DefaultSizeClassMap SizeClassMap;
# elif defined(__aarch64__) && SANITIZER_ANDROID
works, but the performance effects of it are unknown yet.
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Subject: [Bug fortran/85395] New: [7/8] F03 private clause contained in derived type acquires spurious scope
Date: Fri, 13 Apr 2018 14:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85395
Bug ID: 85395
Summary: [7/8] F03 private clause contained in derived type
acquires spurious scope
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: cfd@mnet-mail.de
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The following valid Fortran2003 sample code fails to compile with gfortran
7.2.0/8.0.1, apparently because the private clause contained in derived
type "base2" obtains a spurious scope and affects the declaration of
variables in the (subsequently defined) derived type "options":
$ cat scope.f90
module defs
implicit none
private
public :: base2, options
abstract interface
subroutine proc( res,a )
real(8), dimension(:,:), intent(out) :: res
real(8), dimension(:,:), intent(in) :: a
end subroutine proc
end interface
type, abstract :: base1
contains
end type base1
type, abstract :: base2
contains
! This private clause acquires spurious scope
private
end type base2
type, abstract, extends(base1) :: options
procedure(proc), pointer, nopass :: ptr1
procedure(proc), pointer, nopass :: ptr2
contains
end type options
end module defs
module setup
use defs, only: options
implicit none
private
public :: settings
type, extends(options) :: settings
contains
procedure :: init
end type settings
contains
subroutine init(self)
class(settings) :: self
! initialize procedure pointers
self%ptr1 => null()
self%ptr2 => null()
end subroutine init
end module setup
Trying to compile this gives:
$ gfortran8 -c scope.f90
scope.f90:53:15:
self%ptr1 => null()
1
Error: Component ‘ptr1’ at (1) is a PRIVATE component of ‘options’
scope.f90:54:15:
self%ptr2 => null()
1
Error: Component ‘ptr2’ at (1) is a PRIVATE component of ‘options’
Presently the only ways to get the above code to compile with gfortran
are by
i) deleting the aforementioned private clause, or
ii) explicitly declaring the procedure pointers in type options as "public".
The original code compiles fine with pgfortran 17.4 and flang 6.0.
Gfortran version 8.0.1 used is:
Using built-in specs.
COLLECT_GCC=/home/kk/Gcc-8/bin/gfortran8
COLLECT_LTO_WRAPPER=/home/kk/Gcc-8/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --disable-checking
--enable-languages=c,c++,fortran --disable-multilib --enable-multiarch
--enable-shared --enable-threads=posix --program-suffix=8
--with-gmp=/usr/local/lib --with-mpc=/usr/lib --with-mpfr=/usr/lib
--without-included-gettext --with-system-zlib --with-tune=generic
--prefix=/home/kk/GCC-8
Thread model: posix
gcc version 8.0.1 20180409 (experimental) (GCC)
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/85365] -Wrestrict false positives with -fsanitize=undefined
Date: Fri, 13 Apr 2018 14:39:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Simply avoiding -Wrestrict for null arguments would be a simple workaround for
this case. Beyond that and your other suggestions in comment #4, improving
jump threading would be worthwhile not just to avoid interactions with the
sanitizers but in general.
Let me put together a patch with the first change for now and see about the
threader improvements in GCC 9.
>From gcc-bugs-return-601555-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 14:57:00 2018
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Subject: [Bug fortran/85395] private clause contained in derived type acquires spurious scope
Date: Fri, 13 Apr 2018 14:56:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-13
Summary|[7/8] F03 private clause |private clause contained in
|contained in derived type |derived type acquires
|acquires spurious scope |spurious scope
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 (8.0).
>From gcc-bugs-return-601556-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 15:02:51 2018
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Subject: [Bug fortran/85395] [F03] private clause contained in derived type acquires spurious scope
Date: Fri, 13 Apr 2018 15:02:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|private clause contained in |[F03] private clause
|derived type acquires |contained in derived type
|spurious scope |acquires spurious scope
--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Adjust summary.
>From gcc-bugs-return-601557-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 15:07:54 2018
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Subject: [Bug fortran/85364] -fopenmp should not put array in program on the stack
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-13
Ever confirmed|0 |1
--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The test always succeeds for me with
stack size (kbytes, -s) 65532
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
Date: Fri, 13 Apr 2018 16:26:00 -0000
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--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Let's just back out my couple of patches to ipa-devirt.c. Nobody seems to care
about PR ipa/83983 so I guess I no longer do either.
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Subject: [Bug rtl-optimization/79985] ICE in code_motion_path_driver, at sel-sched.c:6580
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |amonakov at gcc dot gnu.org
--- Comment #6 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Candidate patch for gcc-9 stage 1:
diff --git a/gcc/df-scan.c b/gcc/df-scan.c
index 95e1e0df2d5..4708fc328c6 100644
--- a/gcc/df-scan.c
+++ b/gcc/df-scan.c
@@ -3207,7 +3207,8 @@ df_insn_refs_collect (struct df_collection_rec
*collection_rec,
if (CALL_P (insn_info->insn))
df_get_call_refs (collection_rec, bb, insn_info, flags);
- if (asm_noperands (PATTERN (insn_info->insn)) >= 0)
+ if (asm_noperands (PATTERN (insn_info->insn)) >= 0
+ && volatile_insn_p (PATTERN (insn_info->insn)))
for (unsigned i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (global_regs[i])
{
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>From gcc-bugs-return-601561-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 16:50:17 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85365] -Wrestrict false positives with -fsanitize=undefined
Date: Fri, 13 Apr 2018 16:50:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-04/msg00676.html
>From gcc-bugs-return-601562-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 16:55:52 2018
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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/84842] ICE in verify_target_availability, at sel-sched.c:1569
Date: Fri, 13 Apr 2018 16:55:00 -0000
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
--- Comment #4 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Can you please share tree and rtl dumps for the nice testcase in comment #3 by
re-running it with -fdump-tree-all -fdump-rtl-all and attaching a tar.gz with
those? I could not reproduce it either, so having the dumps might help us see
what's different on our side.
(and an additional archive for a non-failing run without
-fselective-scheduling2 might be helpful too)
>From gcc-bugs-return-601563-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 16:57:59 2018
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From: "acsawdey at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/83660] ICE with vec_extract inside expression statement
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--- Comment #12 from acsawdey at gcc dot gnu.org ---
This function is called from cp/semantics.c maybe_cleanup_point_expr()
tree
fold_build_cleanup_point_expr (tree type, tree expr)
{
/* If the expression does not have side effects then we don't have to wrap
it with a cleanup point expression. */
if (!TREE_SIDE_EFFECTS (expr))
return expr;
In the vec_extract case it bails out due to no side effects and does not put in
the cleanup point.
So in fact a more minimal version of Jakub's patch also works. If you mark that
this has side effects, then the cleanup point is added for us by the existing
code:
Index: config/rs6000/rs6000-c.c
===================================================================
--- config/rs6000/rs6000-c.c (revision 259353)
+++ config/rs6000/rs6000-c.c (working copy)
@@ -6704,6 +6704,8 @@
stmt = convert (innerptrtype, stmt);
stmt = build_binary_op (loc, PLUS_EXPR, stmt, arg2, 1);
stmt = build_indirect_ref (loc, stmt, RO_NULL);
+ if (c_dialect_cxx ())
+ TREE_SIDE_EFFECTS (stmt) = 1;
return stmt;
}
Any comments on whether this is the right way to fix this? I think the
vec_insert case does not need to be changed because the MODIFY_EXPR used there
will mark that there are side effects for us.
>From gcc-bugs-return-601564-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 17:05:13 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 target/83660] ICE with vec_extract inside expression statement
Date: Fri, 13 Apr 2018 17:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83660
--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to acsawdey from comment #12)
> This function is called from cp/semantics.c maybe_cleanup_point_expr()
>
> tree
> fold_build_cleanup_point_expr (tree type, tree expr)
> {
> /* If the expression does not have side effects then we don't have to wrap
> it with a cleanup point expression. */
> if (!TREE_SIDE_EFFECTS (expr))
> return expr;
>
> In the vec_extract case it bails out due to no side effects and does not put
> in the cleanup point.
>
> So in fact a more minimal version of Jakub's patch also works. If you mark
> that this has side effects, then the cleanup point is added for us by the
> existing code:
>
> Index: config/rs6000/rs6000-c.c
> ===================================================================
> --- config/rs6000/rs6000-c.c (revision 259353)
> +++ config/rs6000/rs6000-c.c (working copy)
> @@ -6704,6 +6704,8 @@
> stmt = convert (innerptrtype, stmt);
> stmt = build_binary_op (loc, PLUS_EXPR, stmt, arg2, 1);
> stmt = build_indirect_ref (loc, stmt, RO_NULL);
> + if (c_dialect_cxx ())
> + TREE_SIDE_EFFECTS (stmt) = 1;
>
> return stmt;
> }
>
> Any comments on whether this is the right way to fix this? I think the
> vec_insert case does not need to be changed because the MODIFY_EXPR used
> there will mark that there are side effects for us.
I think this is reasonable, but should have a comment why we do that.
>From gcc-bugs-return-601565-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 18:52:22 2018
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From: "microprogs at mail dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/85396] New: _M_t._M_emplace_hint_unique
Date: Fri, 13 Apr 2018 18:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85396
Bug ID: 85396
Summary: _M_t._M_emplace_hint_unique
Product: gcc
Version: 6.3.0
Status: UNCONFIRMED
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Priority: P3
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Created attachment 43927
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43927&action=edit
preprocessed test.cpp, you can see that src in comment, it's short
// gcc (Raspbian 6.3.0-18+rpi1+deb9u1) 6.3.0 20170516
// cat /etc/debian_version = 9.4
// Linux hostname 4.14.30-v7+ #1102 SMP Mon Mar 26 16:45:49 BST 2018 armv7l
GNU/Linux
// Raspberry Pi 3B
//
// C++11: ERROR, cannot compile
//g++ -std=c++11 -o test test.cpp
//
// C++14: OK
//g++ -std=c++14 -o test test.cpp
//
// old C++: OK
//g++ -o test test.cpp
#include <map>
struct MyType
{
double x;
};
int main(int argc, char** argv)
{
std::map<std::string, MyType> t;
MyType &tss = t[""];
return 0;
}
/*
ERROR:
In file included from /usr/include/c++/6/map:61:0,
from test.cpp:17:
/usr/include/c++/6/bits/stl_map.h: In member function ‘std::map<_Key, _Tp,
_Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare,
_Alloc>::operator[](std::map<_Key, _Tp, _Compare, _Alloc>::key_type&&) [with
_Key = std::__cxx11::basic_string<char>; _Tp = MyType; _Compare =
std::less<std::__cxx11::basic_string<char> >; _Alloc =
std::allocator<std::pair<const std::__cxx11::basic_string<char>, MyType> >]’:
/usr/include/c++/6/bits/stl_map.h:502:4: note: parameter passing for argument
of type ‘std::_Rb_tree<std::__cxx11::basic_string<char>, std::pair<const
std::__cxx11::basic_string<char>, MyType>, std::_Select1st<std::pair<const
std::__cxx11::basic_string<char>, MyType> >,
std::less<std::__cxx11::basic_string<char> >, std::allocator<std::pair<const
std::__cxx11::basic_string<char>, MyType> > >::const_iterator {aka
std::_Rb_tree_const_iterator<std::pair<const std::__cxx11::basic_string<char>,
MyType> >}’ will change in GCC 7.1
__i = _M_t._M_emplace_hint_unique(__i, std::piecewise_construct,
^~~
In file included from /usr/include/c++/6/map:60:0,
from test.cpp:17:
/usr/include/c++/6/bits/stl_tree.h: In member function ‘std::_Rb_tree<_Key,
_Val, _KeyOfValue, _Compare, _Alloc>::iterator std::_Rb_tree<_Key, _Val,
_KeyOfValue, _Compare, _Alloc>::_M_emplace_hint_unique(std::_Rb_tree<_Key,
_Val, _KeyOfValue, _Compare, _Alloc>::const_iterator, _Args&& ...) [with _Args
= {const std::piecewise_construct_t&,
std::tuple<std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >&&>, std::tuple<>}; _Key =
std::__cxx11::basic_string<char>; _Val = std::pair<const
std::__cxx11::basic_string<char>, MyType>; _KeyOfValue =
std::_Select1st<std::pair<const std::__cxx11::basic_string<char>, MyType> >;
_Compare = std::less<std::__cxx11::basic_string<char> >; _Alloc =
std::allocator<std::pair<const std::__cxx11::basic_string<char>, MyType> >]’:
/usr/include/c++/6/bits/stl_tree.h:2193:7: note: parameter passing for argument
of type ‘std::_Rb_tree<std::__cxx11::basic_string<char>, std::pair<const
std::__cxx11::basic_string<char>, MyType>, std::_Select1st<std::pair<const
std::__cxx11::basic_string<char>, MyType> >,
std::less<std::__cxx11::basic_string<char> >, std::allocator<std::pair<const
std::__cxx11::basic_string<char>, MyType> > >::const_iterator {aka
std::_Rb_tree_const_iterator<std::pair<const std::__cxx11::basic_string<char>,
MyType> >}’ will change in GCC 7.1
_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/6/bits/stl_tree.h: In member function
‘std::pair<std::_Rb_tree_node_base*, std::_Rb_tree_node_base*>
std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare,
_Alloc>::_M_get_insert_hint_unique_pos(std::_Rb_tree<_Key, _Val, _KeyOfValue,
_Compare, _Alloc>::const_iterator, const key_type&) [with _Key =
std::__cxx11::basic_string<char>; _Val = std::pair<const
std::__cxx11::basic_string<char>, MyType>; _KeyOfValue =
std::_Select1st<std::pair<const std::__cxx11::basic_string<char>, MyType> >;
_Compare = std::less<std::__cxx11::basic_string<char> >; _Alloc =
std::allocator<std::pair<const std::__cxx11::basic_string<char>, MyType> >]’:
/usr/include/c++/6/bits/stl_tree.h:1928:5: note: parameter passing for argument
of type ‘std::_Rb_tree<std::__cxx11::basic_string<char>, std::pair<const
std::__cxx11::basic_string<char>, MyType>, std::_Select1st<std::pair<const
std::__cxx11::basic_string<char>, MyType> >,
std::less<std::__cxx11::basic_string<char> >, std::allocator<std::pair<const
std::__cxx11::basic_string<char>, MyType> > >::const_iterator {aka
std::_Rb_tree_const_iterator<std::pair<const std::__cxx11::basic_string<char>,
MyType> >}’ will change in GCC 7.1
_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
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Subject: [Bug c++/82099] internal compiler error: in type_throw_all_p, at cp/except.c:1186 when using a function pointer for templated predicate
Date: Fri, 13 Apr 2018 19:15:00 -0000
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Volker Reichelt <reichelt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2017-09-04 00:00:00 |2018-4-13
CC| |reichelt at gcc dot gnu.org
--- Comment #5 from Volker Reichelt <reichelt at gcc dot gnu.org> ---
On trunk (GCC 8) the testcases of comment #2 and comment #4 only crash with
-std=c++17, but don't crash with -std=c++11 or -std=c++14.
>From gcc-bugs-return-601567-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 19:27:58 2018
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85397] New: -mcet -fcf-protection doesn't work with label in nested function
Date: Fri, 13 Apr 2018 19:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85397
Bug ID: 85397
Summary: -mcet -fcf-protection doesn't work with label in
nested function
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
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CC: igor.v.tsimbalist at intel dot com
Blocks: 81652
Target Milestone: ---
Target: x86_64
[hjl@gnu-cet-1 cet-3]$ cat x.i
int
s(int i)
{
if(i>0)
{
__label__ l1;
int f(int i)
{
if(i==2)
goto l1;
return 0;
}
return f(i);
l1:
;
}
return 1;
}
int
x(void)
{
return s(0)==1&&s(1)==0&&s(2)==1;
}
int
main()
{
if(x()!=1)
__builtin_abort();
return 0;
}
[hjl@gnu-cet-1 cet-3]$ make
gcc -O2 -mcet -fcf-protection -S x.i
gcc -g -O2 -mcet -fcf-protection -o x x.s
./x
make: *** [Makefile:10: all] Segmentation fault
[hjl@gnu-cet-1 cet-3]$ gdb x
GNU gdb (GDB) Fedora 8.1-11.fc28
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from x...done.
(gdb) r
Starting program: /export/home/hjl/bugs/gcc/cet-3/x
Missing separate debuginfos, use: dnf debuginfo-install
glibc-2.27-8.6.fc28.x86_64
Program received signal SIGSEGV, Segmentation fault.
s () at x.s:76
76 ret
(gdb) bt
#0 s () at x.s:76
#1 0x0000000000401238 in x () at x.s:136
#2 0x000000000040106d in main () at x.s:157
(gdb)
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
[Bug 81652] [meta-bug] -fcf-protection=full -mcet bugs
>From gcc-bugs-return-601568-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 19:36:49 2018
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Subject: [Bug other/85398] New: g++ reports "array subscript is above array bounds" when it cannot be sure
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85398
Bug ID: 85398
Summary: g++ reports "array subscript is above array bounds"
when it cannot be sure
Product: gcc
Version: 6.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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In following test program:
------------------------------
#define NB_DEV 1
extern unsigned int max;
unsigned long left[NB_DEV];
unsigned long right[NB_DEV];
void foo()
{
unsigned int i;
for (i=1; i < max; i++)
left[i] = right[i-1];
}
------------------------------
compiled with:
$(CXX) -Werror -Wall -O2 -c reprod.cc
g++ gives following warning/error:
reprod.cc: In function 'void foo()':
reprod.cc:13:13: error: array subscript is above array bounds
[-Werror=array-bounds]
left[i] = right[i-1];
~~~~~~^
cc1plus: all warnings being treated as errors
make: *** [Makefile:4: all] Error 1
While there _could_ be an array overflow, g++ cannot know for sure because the
loop boundary 'max' is an external variable. The code is perfectly fine in case
max == 1. In that case, the loop does nothing.
This is a reduced version of real code where the arrays left and right are
dimensioned to some maximum value NB_DEV, and 'max' will be at most that NB_DEV
but possibly smaller. We are thus sure there will not be an array overflow.
Going back to the reproduction code above, if you change NB_DEV to 2 (for
example), no warning is thrown, even though there could still be an overflow in
case max == 5, for example.
According to me, no warning should be thrown because g++ cannot surely say
there is a problem.
Same problem is seen if you compile this as C code rather than C++.
Problem is not seen with -O1, only with -O2 or -O3.
This problem was tested with gcc 6.4.0 (x86_64), gcc 6.3.0 (armeb), gcc 5.4.0
(armeb) and gcc 4.9.4 (armeb).
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Subject: [Bug rtl-optimization/85376] [8 Regression] wrong code with -Og -fno-dce -fgcse -fno-tree-ccp -fno-tree-copy-prop
Date: Fri, 13 Apr 2018 19:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85376
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Apr 13 19:39:11 2018
New Revision: 259377
URL: https://gcc.gnu.org/viewcvs?rev=259377&root=gcc&view=rev
Log:
PR rtl-optimization/85376
* simplify-rtx.c (simplify_const_unary_operation): For CLZ and CTZ and
zero op0, if C?Z_DEFINED_VALUE_AT_ZERO is false, return NULL_RTX
instead of a specific value.
* gcc.dg/pr85376.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr85376.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/simplify-rtx.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-601570-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 19:46:00 2018
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Subject: [Bug rtl-optimization/85376] [8 Regression] wrong code with -Og -fno-dce -fgcse -fno-tree-ccp -fno-tree-copy-prop
Date: Fri, 13 Apr 2018 19:46:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85393] [8 Regression] Miscompilation with hot/cold partitioning starting with r254832
Date: Fri, 13 Apr 2018 19:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85393
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Apr 13 19:55:15 2018
New Revision: 259378
URL: https://gcc.gnu.org/viewcvs?rev=259378&root=gcc&view=rev
Log:
PR rtl-optimization/85393
* except.h (expand_dw2_landing_pad_for_region): Remove declaration.
* except.c (expand_dw2_landing_pad_for_region): Make static.
* bb-reorder.c (fix_up_crossing_landing_pad): In new_bb emit just
a label and unconditional jump to old_bb, rather than
expand_dw2_landing_pad_for_region insn(s) and jump to single_succ
basic block.
* g++.dg/opt/pr85393.C: New test.
* g++.dg/opt/pr85393-aux.cc: New file.
Added:
trunk/gcc/testsuite/g++.dg/opt/pr85393-aux.cc
trunk/gcc/testsuite/g++.dg/opt/pr85393.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/bb-reorder.c
trunk/gcc/except.c
trunk/gcc/except.h
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-601572-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 19:57:48 2018
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Subject: [Bug rtl-optimization/85393] [8 Regression] Miscompilation with hot/cold partitioning starting with r254832
Date: Fri, 13 Apr 2018 19:57:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-601573-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 20:58:44 2018
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Subject: [Bug target/85397] -mcet -fcf-protection doesn't work with label in nested function
Date: Fri, 13 Apr 2018 20:58:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Do we need to define save_stack_nonlocal and restore_stack_nonlocal to
save and restore shadow stack pointers?
>From gcc-bugs-return-601574-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 21:24:57 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/85398] g++ reports "array subscript is above array bounds" when it cannot be sure
Date: Fri, 13 Apr 2018 21:24:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic,
| |missed-optimization
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--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed. It doesn't look like the assignment to left[i] affects the
determination of the maximum number of iterations of the loop during unrolling.
This is also a missed optimization opportunity since the whole loop could be
eliminated.
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Subject: [Bug target/85399] New: Redundant SSP clearing before rdssp
Date: Fri, 13 Apr 2018 21:26:00 -0000
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Bug ID: 85399
Summary: Redundant SSP clearing before rdssp
Product: gcc
Version: 8.0.1
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Since rdssp has been changed to
;; CET instructions
(define_insn "rdssp<mode>"
[(set (match_operand:SWI48x 0 "register_operand" "=r")
(unspec_volatile:SWI48x [(const_int 0)] UNSPECV_NOP_RDSSP))]
"TARGET_SHSTK"
"xor{l}\t%k0, %k0\n\trdssp<mskmodesuffix>\t%0"
[(set_attr "length" "6")
(set_attr "type" "other")])
emit_insn (gen_rtx_SET (reg_ssp, const0_rtx));
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This is redundant now.
emit_insn ((word_mode == SImode)
? gen_rdsspsi (reg_ssp)
: gen_rdsspdi (reg_ssp));
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
[Bug 81652] [meta-bug] -fcf-protection=full -mcet bugs
>From gcc-bugs-return-601576-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 22:08:17 2018
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Subject: [Bug middle-end/85344] Constant constraint check sign extends unsigned constant input operands
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--- Comment #5 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
(In reply to Thomas Preud'homme from comment #4)
> (In reply to Thomas Preud'homme from comment #3)
> > More worrying is that this code compiles without error when it should error
> > out:
> >
> > void
> > foo (void)
> > {
> > __asm( "%0" :: "J" ((unsigned char) 0x80));
> > }
>
> In which case we end up with #-128 in the assembly which is not what the
> user wrote. Thus adding wrong-code tag.
I have difficulty to make up my mind about what is the expected behavior for
constant input in inline asm, esp. for immediate constraint. But first let's
look at register constraint:
asm ("mov %0, %0" : "=r"(result) : "0"((signed char) -128));
will put 0x00000080 in the register holding result. It basically set the
register in the mode of the immediate, so QImode here. I would have expected
for a 32bit register to have the immediate as 2-complement 32bit value, ie
0xFFFFFF80 in this case. The documentation says that a general register should
be used which is true in both case.
Now what about asm ("%0" :: "i"((unsigned char) 128));
This gives -128 in the assembly code, on at least ARM and x86_64 targets but I
would expect likewise on all targets. Likewise:
asm ("%0" :: "i"(0x80000000));
gives #-2147483648 in assembly for the similar reason. Here my expectation is
that provided that the constant can be represented in a const_int its value as
a C level constant is what should be printed in assembly and the constraint
check (eg for constraint I in ARM backend) should be based on that value as
well.
Thoughts?
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Subject: [Bug tree-optimization/85360] FAIL: gfortran.dg/deallocate_stat.f90 -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions (ICE)
Date: Fri, 13 Apr 2018 22:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85360
John David Anglin <danglin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from John David Anglin <danglin at gcc dot gnu.org> ---
Not seen in next build. It's probably a OS problem.
>From gcc-bugs-return-601578-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 22:55:53 2018
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Subject: [Bug rtl-optimization/79916] ICE in Max. number of generated reload insns per insn is achieved (90)
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--- Comment #10 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
Author: vmakarov
Date: Fri Apr 13 22:55:16 2018
New Revision: 259379
URL: https://gcc.gnu.org/viewcvs?rev=259379&root=gcc&view=rev
Log:
2018-04-13 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimization/79916
* config/rs6000/rs6000.c (rs6000_emit_move): Use assigned hard
regs (if any) to define how to gnerate SD moves when LRA is in
progress.
2018-04-13 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimization/79916
* gcc.target/powerpc/pr79916.c: New.
Added:
trunk/gcc/testsuite/gcc.target/powerpc/pr79916.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/rs6000.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/85397] -mcet -fcf-protection doesn't work with label in nested function
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--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Please take a look at hjl/cet/master branch at
https://github.com/hjl-tools/gcc/tree/hjl/cet/master
I replaced builtin_setjmp_setup and builtin_longjmp with save_stack_nonlocal
and restore_stack_nonlocal to save and restore shadow stack to support both
builtin setjmp/longjmp as well as non-local goto in nested functions.
>From gcc-bugs-return-601580-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 13 23:14:18 2018
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Subject: [Bug target/83402] PPC64 implementation of ./rs6000/emmintrin.h gives out of range for _mm_slli_epi32
Date: Fri, 13 Apr 2018 23:14:00 -0000
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--- Comment #12 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Fri Apr 13 23:13:40 2018
New Revision: 259380
URL: https://gcc.gnu.org/viewcvs?rev=259380&root=gcc&view=rev
Log:
rs6000: Fix _mm_slli_epi{32,64} for shift values 16 through 31 and negative
(PR84302)
The powerpc versions of _mm_slli_epi32 and __mm_slli_epi64 in emmintrin.h
do not properly handle shift values between 16 and 31, inclusive.
These are setting up the shift with vec_splat_s32, which only accepts
*5 bit signed* shift values, or a range of -16 to 15. Values above 15
produce an error:
error: argument 1 must be a 5-bit signed literal
Fix is to effectively reduce the range for which vec_splat_s32 is used
to < 32 and use vec_splats otherwise.
Also, __mm_slli_epi{16,32,64}, when given a negative shift value,
should always return a vector of {0}.
PR target/83402
* config/rs6000/emmintrin.h (_mm_slli_epi{16,32,64}):
Ensure that vec_splat_s32 is only called with 0 <= shift < 16.
Ensure negative shifts result in {0}.
gcc/testsuite/
PR target/83402
* gcc.target/powerpc/sse2-psllw-1.c: Refactor and add tests for
several values: positive, negative, and zero.
* gcc.target/powerpc/sse2-pslld-1.c: Same.
* gcc.target/powerpc/sse2-psllq-1.c: Same.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/emmintrin.h
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/powerpc/sse2-pslld-1.c
trunk/gcc/testsuite/gcc.target/powerpc/sse2-psllq-1.c
trunk/gcc/testsuite/gcc.target/powerpc/sse2-psllw-1.c
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Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
Date: Sat, 14 Apr 2018 00:06:00 -0000
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--- Comment #14 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
Created attachment 43928
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43928&action=edit
r256888 pcom dump
So the difference appears to be occurring in predictive commoning. In the
ipa-cp clone, resid.constprop, pcom is failing to hoist some loads/expressions
from the vectorized loop. This results in an additional 9 vector loads and 5
vector adds being executed each iteration of the loop.
I've attached a pcom dump of the original resid() and the clone
resid.constprop(). You can see that in the original resid(), pcom is moving
some loads/adds, but not in resid.constprop(). BB 6 is the vectorized loop in
resid(), BB 5 is the same loop in resid.constprop().
Not sure if this is a similar issue to pr55334 wrt losing restrict.
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Subject: [Bug c++/85400] New: R_SPARC_TLS_*: invalid relocations generated for optimized builds on sparc
Date: Sat, 14 Apr 2018 02:40:00 -0000
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Bug ID: 85400
Summary: R_SPARC_TLS_*: invalid relocations generated for
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In Solaris 10 & 11 using GCC versions 4.8, 4.9.2, 7.2.0 I get relocation errors
when thread_local variables are used in a struct/class. Example code that
reproduces the problem:
> struct Test {
> int blah( int y ) {
> thread_local mything = 3;
> mything = y > 0 ? y : mything;
> return mything;
> }
> };
> int stuff( Test& test, int y ) {
> return test.blah(y);
> }
When compiled:
> $ g++ -m32 -fPIC -std=gnu++14 blah.cc -c -o blah1.o
> $ g++ -m32 -fPIC -std=gnu++14 blah.cc -c -o blah2.o -O3
> $ objdump -xC blah1.o | grep mything
> (...)
> 00000038 R_SPARC_TLS_GD_HI22 Test::blah(int)::mything
> 0000003c R_SPARC_TLS_GD_LO10 Test::blah(int)::mything
> (...)
> $ objdump -xC blah2.o | grep mything
> (...)
> 00000014 R_SPARC_TLS_LDM_HI22 Test::blah(int)::mything
> 0000001c R_SPARC_TLS_LDO_HIX22 Test::blah(int)::mything
> 00000020 R_SPARC_TLS_LDM_LO10 Test::blah(int)::mything
> 00000024 R_SPARC_TLS_LDO_LOX10 Test::blah(int)::mything
> (...)
> $ g++ -m32 -fPIC -shared blah2.o -o libblah.so
> ld: fatal: relocation error: R_SPARC_TLS_LDM_HI22: file blah2.o: symbol: _ZZN4Test4blahEiE7mything: bound to: blah.o: relocation illegal when not bound to object being created
> ld: fatal: relocation error: R_SPARC_TLS_LDM_HIX22: file blah2.o: symbol: _ZZN4Test4blahEiE7mything: bound to: blah.o: relocation illegal when not bound to object being created
> ...
For reference:
* It happens at all optimization levels above -O0 and for all combinations of
-std={c,gnu}++{11,14}
* This was discovered while building boost 1.66.0 with -std=gnu++14. The error
occurs while linking libboost_fiber.so and comes from work_stealing.cpp for
boost::fibers::detail::spinlock_ttas::lock()::generator ... where "generator"
in that code is a static thread_local at member-function scope.
* The compilers I built and those produced by OpenCSW use the Solaris assembler
(/usr/ccs/bin/as) instead of gas.
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Subject: [Bug target/85397] -mcet -fcf-protection doesn't work with label in nested function
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--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
builtin_longjmp has also the same issue as PR 85025. I fixed it on
hjl/cet/master branch.
>From gcc-bugs-return-601584-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 05:05:27 2018
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Subject: [Bug target/85401] New: segfault building code for VAX
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85401
Bug ID: 85401
Summary: segfault building code for VAX
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: coypu at sdf dot org
Target Milestone: ---
Created attachment 43929
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43929&action=edit
Reproduce test
build with the following flags fails:
-O2 -fno-pic -c ip_icmp.i
here is a backtrace, from trunk as of April 14 2018.
Starting program: /home/fly/gcc/build/gcc/cc1 -fpreprocessed ip_icmp.i -quiet
-dumpbase ip_icmp.i -auxbase ip_icmp -O2 -fno-pic -o /var/tmp//ccO5AxRb.s
In file included from ../../../../sys/timevar.h:66,
from ../../../../sys/time.h:307,
from ../../../../sys/param.h:145,
from ../../../../netinet/ip_icmp.c:103:
../../../../sys/systm.h:225:6: warning: conflicting types for built-in function
'printf' [-Wbuiltin-declaration-mismatch]
../../../../sys/systm.h:229:6: warning: conflicting types for built-in function
'vprintf' [-Wbuiltin-declaration-mismatch]
In file included from ../../../../netinet/ip_icmp.c:112:
../../../../sys/syslog.h:233:6: warning: conflicting types for built-in
function 'log' [-Wbuiltin-declaration-mismatch]
Program received signal SIGSEGV, Segmentation fault.
0x0000000000bfd868 in allocno_copy_cost_saving (allocno=0x7e3c3e791190,
hard_regno=11) at ../../gcc/ira-color.c:2832
2832 cost += cp->freq *
ira_register_move_cost[allocno_mode][rclass][rclass];
1: rclass = ALL_REGS
2: allocno_mode = E_QImode
3: ira_register_move_cost[allocno_mode][rclass][rclass] = <error: Cannot access
memory at address 0x6>
4: cp->freq = 36
5: ira_register_move_cost = {0x0, 0x0, 0x0, 0x0, 0x0, 0x7e3c3ed98850,
0x7e3c3ed98850, 0x0 <repeats 32 times>}
(gdb) bt full
#0 0x0000000000bfd868 in allocno_copy_cost_saving (allocno=0x7e3c3e791190,
hard_regno=11) at ../../gcc/ira-color.c:2832
cost = 0
allocno_mode = E_QImode
rclass = ALL_REGS
cp = 0x7e3c3e511380
next_cp = 0x0
__FUNCTION__ = "allocno_copy_cost_saving"
#1 0x0000000000bfdbb9 in improve_allocation () at ../../gcc/ira-color.c:2905
i = 2
j = 11
k = 11
n = 5
hregno = 11
conflict_hregno = 1
base_cost = 2232
class_size = 12
word = 1
nwords = 1
check = 3
spill_cost = 4068
min_cost = -594
nregs = 1
conflict_nregs = 1
r = 2
best = 10
try_p = true
aclass = ALL_REGS
mode = E_SImode
allocno_costs = 0x7e3c3e7313c8
costs = {-1740536, 40443, 0, 484, 552, 0, -2232, -2232, -2232, -2232,
-2232, 0, 1050933376, 32316, -1741856, 32639}
conflicting_regs = {18446744073709547521, 140187730799504}
profitable_hard_regs = 4032
a = 0x7e3c3e791190
bi = {elt1 = 0x7e3c3e7b1a90, elt2 = 0x0, word_no = 0, bits =
4611686018427387903}
__FUNCTION__ = "improve_allocation"
#2 0x0000000000bfea51 in color_allocnos () at ../../gcc/ira-color.c:3201
i = 256
n = 32316
bi = {elt1 = 0x0, elt2 = 0x0, word_no = 2, bits = 0}
a = 0x7e3c3e799050
__FUNCTION__ = "color_allocnos"
#3 0x0000000000bff13f in color_pass (loop_tree_node=0x7e3c3ed2fc00) at
../../gcc/ira-color.c:3310
regno = 32316
hard_regno = -1741504
index = -1
n = 81
cost = 0
exit_freq = 1048255088
enter_freq = 0
j = 256
bi = {elt1 = 0x0, elt2 = 0x0, word_no = 2, bits = 0}
mode = 32639
rclass = NO_REGS
aclass = (unknown: 33152352)
pclass = (ALL_REGS | LIM_REG_CLASSES | unknown: 9049864)
a = 0x7e3c3e799050
subloop_allocno = 0xb8
subloop_node = 0x7f7fffe56d20
__FUNCTION__ = "color_pass"
#4 0x0000000000be8146 in ira_traverse_loop_tree (bb_p=false,
loop_node=0x7e3c3ed2fc00,
preorder_func=0xbfef25 <color_pass(ira_loop_tree_node_t)>,
postorder_func=0x0) at ../../gcc/ira-build.c:1781
subloop_node = 0xbd6ab8 <ira_allocate_bitmap()+14>
__FUNCTION__ = "ira_traverse_loop_tree"
#5 0x0000000000bffa0d in do_coloring () at ../../gcc/ira-color.c:3461
No locals.
#6 0x0000000000c03501 in color () at ../../gcc/ira-color.c:4838
No locals.
#7 0x0000000000c039d3 in ira_color () at ../../gcc/ira-color.c:4953
a = 0x7e3c3e799050
ai = {n = 172}
#8 0x0000000000be30ff in ira (f=0x0) at ../../gcc/ira.c:5308
loops_p = true
ira_max_point_before_emit = 524288
saved_flag_caller_saves = true
saved_flag_ira_region = IRA_REGION_MIXED
__FUNCTION__ = "ira"
#9 0x0000000000be3887 in (anonymous namespace)::pass_ira::execute
(this=0x7e3c3ed86bc0) at ../../gcc/ira.c:5606
No locals.
#10 0x0000000000d142af in execute_one_pass (pass=0x7e3c3ed86bc0) at
../../gcc/passes.c:2497
todo_after = 0
gate_status = true
__FUNCTION__ = "execute_one_pass"
#11 0x0000000000d14600 in execute_pass_list_1 (pass=0x7e3c3ed86bc0) at
../../gcc/passes.c:2586
__FUNCTION__ = "execute_pass_list_1"
#12 0x0000000000d14631 in execute_pass_list_1 (pass=0x7e3c3ed85ac0) at
../../gcc/passes.c:2587
__FUNCTION__ = "execute_pass_list_1"
#13 0x0000000000d14689 in execute_pass_list (fn=0x7e3c3e64c790,
pass=0x7e3c3ed82080) at ../../gcc/passes.c:2597
__FUNCTION__ = "execute_pass_list"
#14 0x0000000000935b0e in cgraph_node::expand (this=0x7e3c3e68c730) at
../../gcc/cgraphunit.c:2139
saved_loc = 62585088
__FUNCTION__ = "expand"
#15 0x0000000000936149 in expand_all_functions () at
../../gcc/cgraphunit.c:2275
node = 0x7e3c3e68c730
order = 0x7e3c3ed2d800
expanded_func_count = 11
profiled_func_count = 0
order_pos = 96
new_order_pos = 18
i = 7
__FUNCTION__ = "expand_all_functions"
#16 0x0000000000936c95 in symbol_table::compile (this=0x7e3c3eb06000) at
../../gcc/cgraphunit.c:2624
No locals.
#17 0x0000000000936eff in symbol_table::finalize_compilation_unit
(this=0x7e3c3eb06000) at ../../gcc/cgraphunit.c:2717
No locals.
#18 0x0000000000dfc753 in compile_file () at ../../gcc/toplev.c:480
No locals.
#19 0x0000000000dfefad in do_compile () at ../../gcc/toplev.c:2132
i = 1
#20 0x0000000000dff289 in toplev::main (this=0x7f7fffe570ce, argc=12,
argv=0x7f7fffe57120) at ../../gcc/toplev.c:2267
__FUNCTION__ = "main"
#21 0x000000000156cd6f in main (argc=12, argv=0x7f7fffe57120) at
../../gcc/main.c:39
toplev = {m_use_TV_TOTAL = true, m_init_signals = true}
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
Date: Sat, 14 Apr 2018 06:39:00 -0000
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Eric Botcazou from comment #4)
> Let's just back out my couple of patches to ipa-devirt.c. Nobody seems to
> care about PR ipa/83983 so I guess I no longer do either.
Sorry for overlooking the PR83983, I can help you with that next week.
Now I've got reduced 1/6 of preprocessed files. Hope that having a reasonable
small test-case would allow you do debug that and fix?
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Subject: [Bug c/85402] New: excessive compile time with -Wmissing-braces
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85402
Bug ID: 85402
Summary: excessive compile time with -Wmissing-braces
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
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Created attachment 43930
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43930&action=edit
C source code
The attached C code - when compiled by -Wmissing-braces - can cause
compile times of over 100 minutes on gcc trunk. -O2 doesn't seem
to be required.
-Wmissing-braces seems to want to print out all parts of a very long
data structure in the user's source code.
Maybe this should be constrained to the first 100 or 1000 elements or so.
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Subject: [Bug target/85401] segfault building code for VAX
Date: Sat, 14 Apr 2018 09:02:00 -0000
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--- Comment #1 from coypu <coypu at sdf dot org> ---
Threw computing resources at the problem, so now I have an "offending" commit.
Before this commit, it doesn't segfault.
After, it does.
commit bbb9b536dd58015b5712a867954d34aae9d9dae5 (HEAD, refs/bisect/bad)
Author: thopre01 <thopre01@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue Jan 6 11:51:16 2015 +0000
2015-01-06 Thomas Preud'homme <thomas.preudhomme@arm.com>
gcc/
PR tree-optimization/63259
* tree-ssa-math-opts.c (pass_optimize_bswap::execute): Stop checking
if optab exists for 16bit byteswap.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@219256
138bc75d-0d04-0410-961f-82ee72b054a4
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
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--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Sorry for overlooking the PR83983, I can help you with that next week.
> Now I've got reduced 1/6 of preprocessed files. Hope that having a
> reasonable small test-case would allow you do debug that and fix?
No, sorry, I'm giving up, just revert my couple of changes instead.
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Subject: [Bug libgcc/61152] Missing GCC Runtime Library Exception in some files that are included in libgcc
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--- Comment #10 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #9)
> There have been a bunch of commits for this bug; is it fixed yet?
Dunno, back then I focused only on two targets, namely ARM and V850. Neither
did I perform a global review, nor do I know whether in the meantime (4 years
now) more headers and files slipped in.
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Subject: [Bug fortran/85387] [8 Regression] incorrect output with optimization /= 0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85387
Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |tkoenig at gcc dot gnu.org
>From gcc-bugs-return-601591-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 11:55:37 2018
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Subject: [Bug target/42947] multilib and startup files paths differ on sh4 with -m4 and without -m4 where -m4 is default multilib
Date: Sat, 14 Apr 2018 11:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42947
--- Comment #5 from Sergei Trofimovich <slyfox at inbox dot ru> ---
I have looked at it a bit and I think the bug here is in interaction between
MULTILIB_DEFAULTS
and
SYSROOT_SUFFIX_SPEC
AFAIU normally gcc ignores spec overrides for MULTILIB_DEFAULTS.
In our case values are:
// from sh/sh.h expansion
#define MULTILIB_DEFAULTS { "ml", "m4" }
// from autogenerated multilib.h
static const char *const multilib_raw[] = {
". !m4;",
"m4 m4;",
NULL
};
// from autogenerated sysroot-suffix.h
#define SYSROOT_SUFFIX_SPEC "" \
"%{m4:/m4;" \
":}"
Note even when we pass option -m4 we never append 'm4' suffix in library search
path (because it's a MULTILIB_DEFAULTS).
Looks like sh is one of 2 rare targets that touch t-sysroot-suffix:
sh-*-elf* | sh[12346l]*-*-elf* | \
sh-*-linux* | sh[2346lbe]*-*-linux* | \
sh-*-netbsdelf* | shl*-*-netbsdelf*)
tmake_file="... t-sysroot-suffix"
tic6x-*-uclinux)
tmake_file="t-sysroot-suffix ..."
I think a few possible solutions here are:
- drop SYSROOT_SUFFIX_SPEC support for sh* targets (or some of sh targets)
- fix SYSROOT_SUFFIX_SPEC parsing to respect MULTILIB_DEFAULTS
Does the above sound about right?
I know nothing about SYSROOT_SUFFIX_SPEC.
What uses it? It feels like a competing mechanism to multilib.
>From gcc-bugs-return-601592-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 12:21:14 2018
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Subject: [Bug target/42947] multilib and startup files paths differ on sh4 with -m4 and without -m4 where -m4 is default multilib
Date: Sat, 14 Apr 2018 12:21:00 -0000
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--- Comment #6 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Created attachment 43931
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43931&action=edit
0001-gcc-config.gcc-sh-Disable-sysroot-suffix-PR42947.patch
0001-gcc-config.gcc-sh-Disable-sysroot-suffix-PR42947.patch implements "- drop
SYSROOT_SUFFIX_SPEC support for sh* targets" above. Tested as:
cc="${HOME}/dev/git/gcc-sh4-installed/bin/sh4-unknown-linux-gnu-gcc
-B/usr/libexec/gcc/sh4-unknown-linux-gnu/"
$ cc="${built}/sh4-unknown-linux-gnu-gcc"
$ echo 'int main(){}' > 'a.c'
$ $cc a.c -o a
$ $cc a.c -o a.m4 -m4
$ $cc a.c -o a.m4 -m4-100
All 3 work now.
>From gcc-bugs-return-601593-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 13:24:43 2018
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Subject: [Bug middle-end/85403] New: internal compiler error: ... config/i386/i386.c:32347
Date: Sat, 14 Apr 2018 13:24:00 -0000
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Bug ID: 85403
Summary: internal compiler error: ... config/i386/i386.c:32347
Product: gcc
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[hjl@gnu-cfl-1 gcc]$ /export/build/gnu/gcc-cet-test/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc-cet-test/build-x86_64-linux/gcc/
/export/gnu/import/git/sources/gcc/gcc/testsuite/gcc.target/i386/mvc1.c
-fcf-protection -mcet -fno-diagnostics-show-caret -fdiagnostics-color=never
-ansi -pedantic-errors -lm -o ./mvc1.exe
/export/gnu/import/git/sources/gcc/gcc/testsuite/gcc.target/i386/mvc1.c: In
function \u2018foo.resolver\u2019:
/export/gnu/import/git/sources/gcc/gcc/testsuite/gcc.target/i386/mvc1.c:27:1:
error: \u2018-fcf-protection=full\u2019 requires Intel CET support. Use -mcet
or both of -mibt and -mshstk options to enable CET
during IPA pass: targetclone
/export/gnu/import/git/sources/gcc/gcc/testsuite/gcc.target/i386/mvc1.c:27:1:
internal compiler error: tree check: expected target_option_node, have
error_mark in get_builtin_code_for_version, at config/i386/i386.c:32347
0x13624ff tree_check_failed(tree_node const*, char const*, int, char const*,
...)
/export/gnu/import/git/sources/gcc/gcc/tree.c:9327
0x7ddca8 tree_check(tree_node*, char const*, int, char const*, tree_code)
/export/gnu/import/git/sources/gcc/gcc/tree.h:3135
0x146134e get_builtin_code_for_version
/export/gnu/import/git/sources/gcc/gcc/config/i386/i386.c:32347
0x1461b43 dispatch_function_versions
/export/gnu/import/git/sources/gcc/gcc/config/i386/i386.c:32631
0x14629ab ix86_generate_version_dispatcher_body
/export/gnu/import/git/sources/gcc/gcc/config/i386/i386.c:32967
0x1c16fcd create_dispatcher_calls
/export/gnu/import/git/sources/gcc/gcc/multiple_target.c:97
0x1c18098 ipa_target_clone
/export/gnu/import/git/sources/gcc/gcc/multiple_target.c:437
0x1c18104 execute
/export/gnu/import/git/sources/gcc/gcc/multiple_target.c:466
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
[hjl@gnu-cfl-1 gcc]$
Since CET is applied to the whole program, it is correct to disallow
-fcf-protection=full without -mcet. But compiler shouldn't crash.
>From gcc-bugs-return-601594-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 13:39:19 2018
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Subject: [Bug fortran/85387] [8 Regression] incorrect output with optimization /= 0
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--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Sat Apr 14 13:38:41 2018
New Revision: 259384
URL: https://gcc.gnu.org/viewcvs?rev=259384&root=gcc&view=rev
Log:
2018-04-14 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/85387
* frontend-passes.c (traverse_io_block): Check for start, end or
stride being defined by an outer implied DO loop.
2018-04-14 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/85387
* gfortran.dg/implied_do_io_5.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/implied_do_io_5.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/frontend-passes.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/85387] [8 Regression] incorrect output with optimization /= 0
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Fixed, closing.
Thanks for the bug report!
>From gcc-bugs-return-601596-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 14:27:03 2018
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Subject: [Bug fortran/85364] -fopenmp should not put array in program on the stack
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--- Comment #6 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #3)
> If it is about variables in MAIN__ and not say variables inside of BLOCK
> inside of MAIN__, then perhaps. For BLOCK, I wonder about stuff like:
> !$omp parallel
> block
> integer :: i
> i = ...
> use (i)
> end block
> !$omp end parallel
> end
> and similar, where the implicit SAVE would be undesirable.
As far as I understand the Fortran standard, variables inside BLOCKs
are not affected.
Definition:
1.3.124
scoping unit
BLOCK construct, derived-type definition, interface body, program unit, or
subprogram, excluding all nested
scoping units in it
5.3.16 says
A variable, common block, or procedure pointer declared in the scoping unit of
a main program, module, or
submodule implicitly has the SAVE attribute, which may be confirmed by explicit
specification.
So, in your example, the variable i is unsaved.
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Subject: [Bug target/85404] New: -fcf-protection -mcet doesn't work with -fleading-underscore
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Bug ID: 85404
Summary: -fcf-protection -mcet doesn't work with
-fleading-underscore
Product: gcc
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CC: igor.v.tsimbalist at intel dot com
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Target Milestone: ---
[hjl@gnu-cfl-1 gcc]$ cat x.c
void func(void) __asm("_func");
void _func(int x) {}
void func(void) {}
[hjl@gnu-cfl-1 gcc]$ ./xgcc -B./ -c -fcf-protection -mcet -fleading-underscore
x.c
/tmp/ccPfHME2.s: Assembler messages:
/tmp/ccPfHME2.s:37: Error: can't resolve `.L11' {*UND* section} - `.L1' {*UND*
section}
/tmp/ccPfHME2.s:38: Error: can't resolve `.L41' {*UND* section} - `.L11' {*UND*
section}
/tmp/ccPfHME2.s:45: Error: can't resolve `.L31' {*UND* section} - `.L21' {*UND*
section}
/tmp/ccPfHME2.s: Error: local label `"1" (instance number 1 of a fb label)' is
not defined
/tmp/ccPfHME2.s: Error: local label `"0" (instance number 1 of a fb label)' is
not defined
/tmp/ccPfHME2.s: Error: local label `"4" (instance number 1 of a fb label)' is
not defined
/tmp/ccPfHME2.s: Error: local label `"3" (instance number 1 of a fb label)' is
not defined
/tmp/ccPfHME2.s: Error: local label `"2" (instance number 1 of a fb label)' is
not defined
[hjl@gnu-cfl-1 gcc]$
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
[Bug 81652] [meta-bug] -fcf-protection=full -mcet bugs
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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, 14 Apr 2018 14:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83606
--- Comment #4 from vehre at gcc dot gnu.org ---
Author: vehre
Date: Sat Apr 14 14:45:59 2018
New Revision: 259385
URL: https://gcc.gnu.org/viewcvs?rev=259385&root=gcc&view=rev
Log:
gcc/fortran/ChangeLog:
2018-04-14 Andre Vehreschild <vehre@gcc.gnu.org>
PR fortran/81773
PR fortran/83606
* 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:
2018-04-14 Andre Vehreschild <vehre@gcc.gnu.org>
PR fortran/81773
PR fortran/83606
* gfortran.dg/coarray/get_to_indexed_array_1.f90: New test.
* gfortran.dg/coarray/get_to_indirect_array.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/coarray/get_to_indexed_array_1.f90
trunk/gcc/testsuite/gfortran.dg/coarray/get_to_indirect_array.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/dependency.c
trunk/gcc/fortran/trans-array.c
trunk/gcc/fortran/trans-intrinsic.c
trunk/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, 14 Apr 2018 14:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81773
--- Comment #5 from vehre at gcc dot gnu.org ---
Author: vehre
Date: Sat Apr 14 14:45:59 2018
New Revision: 259385
URL: https://gcc.gnu.org/viewcvs?rev=259385&root=gcc&view=rev
Log:
gcc/fortran/ChangeLog:
2018-04-14 Andre Vehreschild <vehre@gcc.gnu.org>
PR fortran/81773
PR fortran/83606
* 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:
2018-04-14 Andre Vehreschild <vehre@gcc.gnu.org>
PR fortran/81773
PR fortran/83606
* gfortran.dg/coarray/get_to_indexed_array_1.f90: New test.
* gfortran.dg/coarray/get_to_indirect_array.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/coarray/get_to_indexed_array_1.f90
trunk/gcc/testsuite/gfortran.dg/coarray/get_to_indirect_array.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/dependency.c
trunk/gcc/fortran/trans-array.c
trunk/gcc/fortran/trans-intrinsic.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-601600-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 15:22:14 2018
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Subject: [Bug target/85404] -fcf-protection -mcet doesn't work with -fleading-underscore
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-14
Ever confirmed|0 |1
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Please take a look at hjl/cet/master branch at
https://github.com/hjl-tools/gcc/tree/hjl/cet/master
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Subject: [Bug target/85399] Redundant SSP clearing before rdssp
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H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
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--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
This will be fixed by PR 85397.
*** This bug has been marked as a duplicate of bug 85397 ***
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Subject: [Bug target/81652] [meta-bug] -fcf-protection=full -mcet bugs
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Bug 81652 depends on bug 85399, which changed state.
Bug 85399 Summary: Redundant SSP clearing before rdssp
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85399
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
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--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
*** Bug 85399 has been marked as a duplicate of this bug. ***
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From: "vehre at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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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, 14 Apr 2018 17:08:00 -0000
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vehre at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from vehre at gcc dot gnu.org ---
Fixed by r259385.
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Subject: [Bug fortran/83700] [Meta-bug] Fortran Coarray issues
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Bug 83700 depends on bug 81773, which changed state.
Bug 81773 Summary: [Coarray] Get with vector index on lhs leads to incorrect caf_get_by_ref() call.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81773
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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>From gcc-bugs-return-601606-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 17:09:43 2018
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From: "vehre at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/83606] [6/7/8 Regression] co-indexed array RHS yields incorrect result in assignment to vector-indexed LHS
Date: Sat, 14 Apr 2018 17:09:00 -0000
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vehre at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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--- Comment #5 from vehre at gcc dot gnu.org ---
Fxied by r259385.
>From gcc-bugs-return-601607-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 20:16:55 2018
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From: "jvdelisle at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/83606] [6/7/8 Regression] co-indexed array RHS yields incorrect result in assignment to vector-indexed LHS
Date: Sat, 14 Apr 2018 20:16:00 -0000
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Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jvdelisle at gcc dot gnu.org
--- Comment #6 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
This is shown as a regression on 6 and 7 are you going to backport this? Is it
even back-portable?
>From gcc-bugs-return-601608-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 21:13:58 2018
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Subject: [Bug target/85293] ICE in output_1257, at config/rs6000/vsx.md:3252
Date: Sat, 14 Apr 2018 21:13:00 -0000
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--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Sat Apr 14 21:13:20 2018
New Revision: 259386
URL: https://gcc.gnu.org/viewcvs?rev=259386&root=gcc&view=rev
Log:
rs6000: Disable -m[no-]direct-move (PR85293)
The -mno-direct-move option causes a lot of problems, since it forces
us to be able to generate code for p8 and up with some crucial
instructions missing. This patch removes the -m[no-]direct-move
options so that the user cannot put us into this unexpected situation
anymore. Internally we still have all the same flags, and they are
automatically set based on -mcpu; getting rid of that is a lot more
work and will have to wait for GCC 9 (in some places the flag is used
to see if we are compiling for a p8 _at all_).
PR target/85293
* config/rs6000/rs6000.opt (mdirect-move): Make deprecated.
* doc/invoke.texi (RS/6000 and PowerPC Options): Remove -mdirect-move
and -mno-direct-move.
gcc/testsuite/
PR target/85293
* gcc.target/powerpc/pr80098-2.c: Remove -mdirect-move. Remove the
corresponding dg-error clause.
* gcc.target/powerpc/pr80098-3.c: Ditto.
* gcc.target/powerpc/pr80103-1.c: Delete.
Removed:
trunk/gcc/testsuite/gcc.target/powerpc/pr80103-1.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/rs6000.opt
trunk/gcc/doc/invoke.texi
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/powerpc/pr80098-2.c
trunk/gcc/testsuite/gcc.target/powerpc/pr80098-3.c
>From gcc-bugs-return-601609-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 21:14:42 2018
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Subject: [Bug target/85293] ICE in output_1257, at config/rs6000/vsx.md:3252
Date: Sat, 14 Apr 2018 21:14:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-601610-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 21:16:17 2018
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From: "krzysio.kurek at wp dot pl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/82229] GCC7's LTO underperforms compared to GCC6
Date: Sat, 14 Apr 2018 21:16:00 -0000
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krzysio.kurek at wp dot pl changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|7.1.0 |7.2.0
--- Comment #17 from krzysio.kurek at wp dot pl ---
I've been trying to create a minimal testcase but I've not been able to.
Seemingly random actions like changing the directory from the build dir back
into it prevents the bug from manifesting.
Looking at results of Valgrind's tool, Callgrind, I've managed to find the hog
being Random::get() calls not being optimized as aggressively on GCC7 as on
GCC6.
On GCC6, std::mersenne_twister_engine is being called directly from the main
world simulation loop, whereas on GCC7, Random::get() is called every time
calculations on random numbers are made. Random::get() in turn calls
std::uniform_int_distribution which then calls the mersenne engine.
>From gcc-bugs-return-601611-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Apr 14 23:26:59 2018
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From: "m.vorobyov at cs dot msu.ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/71235] march=silvermont turns on aes by default
Date: Sat, 14 Apr 2018 23:26:00 -0000
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Mikhail Vorobyov <m.vorobyov at cs dot msu.ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |m.vorobyov at cs dot msu.ru
--- Comment #1 from Mikhail Vorobyov <m.vorobyov at cs dot msu.ru> ---
There is the same problem with Sandybridge. All Sandybridge i3 mobile cores
doesn't support aes accordingly to https://ark.intel.com/. E.g.
https://ark.intel.com/products/54624/.
But -march=sandybridge enables __AES__.
I thought -march=X should be valid for all of X too.
>From gcc-bugs-return-601612-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 15 06:02:12 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85366] Failure to use both div and mod results of one IDIV in a prime-factor loop while(n%i==0) { n/=i; }
Date: Sun, 15 Apr 2018 06:02:00 -0000
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For arm64, it is obvious why it is not optimized into one divide:
.L2:
udiv w2, w0, w3
msub w2, w2, w3, w0
cbnz w2, .L5
sdiv w2, w0, w3
.p2align 2
.L4:
mov w0, w2
str w3, [x1], 4
sdiv w2, w2, w3
msub w4, w2, w3, w0
cbz w4, .L4
.L5:
add w3, w3, 1
cmp w3, w0
ble .L2
.L1:
ret
--- CUT ---
In the first case we have an unsigned division while in the second case we have
a signed division.
>From gcc-bugs-return-601613-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 15 06:12:12 2018
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Subject: [Bug tree-optimization/85366] Failure to use both div and mod results of one IDIV in a prime-factor loop while(n%i==0) { n/=i; }
Date: Sun, 15 Apr 2018 06:12:00 -0000
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For GCC 7.3 on aarch64:
;; _23 = n_26 % i_30;
(insn 83 76 84 (set (reg:SI 142)
(udiv:SI (reg/v:SI 117 [ n ])
(reg/v:SI 115 [ i ]))) "t88.c":6 -1
(nil))
(insn 84 83 85 (set (reg:SI 143)
(mult:SI (reg:SI 142)
(reg/v:SI 115 [ i ]))) "t88.c":6 -1
(nil))
(insn 85 84 0 (set (reg:SI 116 [ _23 ])
(minus:SI (reg/v:SI 117 [ n ])
(reg:SI 143))) "t88.c":6 -1
(nil))
This is because the range of n_26 is positive only:
# RANGE [2, 2147483647] NONZERO 2147483647
But we know that here both div and udiv will return the same result ...
>From gcc-bugs-return-601614-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 15 08:57:45 2018
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
Date: Sun, 15 Apr 2018 08:57:00 -0000
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--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 43932
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test-case
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
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--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
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--- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 43935
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test-case
>From gcc-bugs-return-601617-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 15 09:02:56 2018
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Subject: [Bug lto/85405] New: [5/6/7 Regression] ICE in odr_types_equivalent_p, at ipa-devirt.c:1581
Date: Sun, 15 Apr 2018 09:02:00 -0000
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Bug ID: 85405
Summary: [5/6/7 Regression] ICE in odr_types_equivalent_p, at
ipa-devirt.c:1581
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Starting from r215196 we ICE on:
$ cat 1.ii
class VclReferenceBase {
int mnRefCnt;
bool mbDisposed : 1;
virtual ~VclReferenceBase();
};
class a;
class b {
a &e;
bool c();
};
class B {
VclReferenceBase d;
};
class a : B {};
bool b::c() {}
$ cat 2.ii
cat 2.ii
class VclReferenceBase {
int mnRefCnt;
bool mbDisposed;
protected:
virtual ~VclReferenceBase();
};
class : VclReferenceBase {
} a;
$ g++ *.ii -flto
1.ii: In member function ‘bool b::c()’:
1.ii:15:14: warning: no return statement in function returning non-void
[-Wreturn-type]
bool b::c() {}
^
lto1: internal compiler error: in odr_types_equivalent_p, at ipa-devirt.c:1591
0x7f26af odr_types_equivalent_p
../../gcc/ipa-devirt.c:1590
0x7f2dd2 add_type_duplicate
../../gcc/ipa-devirt.c:1860
0x7f2dd2 get_odr_type(tree_node*, bool)
../../gcc/ipa-devirt.c:2056
0x7f420e register_odr_type(tree_node*)
../../gcc/ipa-devirt.c:2139
0x5dd2f7 lto_read_decls
../../gcc/lto/lto.c:1782
0x5de15b lto_file_finalize
../../gcc/lto/lto.c:2076
0x5de15b lto_create_files_from_ids
../../gcc/lto/lto.c:2086
0x5de15b lto_file_read
../../gcc/lto/lto.c:2127
0x5de15b read_cgraph_and_symbols
../../gcc/lto/lto.c:2839
0x5de15b lto_main()
../../gcc/lto/lto.c:3356
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
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--- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 43936
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test-case
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
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--- Comment #11 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 43937
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
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--- Comment #12 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 43938
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test-case
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |needs-reduction
--- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> ---
I'm uploading test-cases. Unfortunately during reduction I diverged to PR85405.
>From gcc-bugs-return-601622-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 15 10:53:44 2018
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Subject: [Bug lto/82229] GCC7's LTO underperforms compared to GCC6
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--- Comment #18 from krzysio.kurek at wp dot pl ---
I'm sorry if it's not clear, English isn't my native language.
So to reiterate.
The normal, unoptimized path is:
World::update() simulates world which uses Random::get() on every person.
Random::get() calls
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Subject: [Bug lto/82229] GCC7's LTO underperforms compared to GCC6
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--- Comment #19 from krzysio.kurek at wp dot pl ---
I'm sorry if it's not clear, English isn't my native language.
So to reiterate.
The normal, unoptimized path is:
World::update() simulates world which uses Random::get() to generate a random
number. Random::get() calls std::uniform_int_distribution, which then calls
std::mersenne_twister_engine().
And this is what GCC7 uses.
Now GCC6 with LTO manages to optimize the path by:
Calling Random::get() only once per frame.
Omitting std::uniform_int_distribution, calling std::mersenne_twister_engine()
instead every time a random number is needed.
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--- Comment #20 from krzysio.kurek at wp dot pl ---
Reopening.
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Subject: [Bug target/42947] multilib and startup files paths differ on sh4 with -m4 and without -m4 where -m4 is default multilib
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--- Comment #7 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to Sergei Trofimovich from comment #6)
> Created attachment 43931 [details]
Thanks for the patch Sergei. Are there any known drawbacks of dropping
SYSROOT_SUFFIX_SPEC support?
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Subject: [Bug target/71235] march=silvermont turns on aes by default
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The documentation documents that -march=sandybridge includes -maes.
The lowest common denominator is getting too far away from the most common CPUs
of the category.
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Subject: [Bug target/71235] march=silvermont turns on aes by default
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--- Comment #3 from Mikhail Vorobyov <m.vorobyov at cs dot msu.ru> ---
Maybe it should be said more precisely that -march isn't for all cores of
family but for only ones which have those extensions?
>From gcc-bugs-return-601628-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 15 15:05:48 2018
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Subject: [Bug tree-optimization/85406] New: Unnecessary blend when vectorizing short-cutted calculations
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Bug ID: 85406
Summary: Unnecessary blend when vectorizing short-cutted
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If you have something like this:
inline unsigned qPremultiply(unsigned x)
{
const unsigned a = x >> 24;
if (a == 255)
return x;
unsigned t = (x & 0xff00ff) * a;
t = (t + ((t >> 8) & 0xff00ff) + 0x800080) >> 8;
t &= 0xff00ff;
x = ((x >> 8) & 0xff) * a;
x = (x + ((x >> 8) & 0xff) + 0x80);
x &= 0xff00;
return x | t | (a << 24);
}
Gcc will vectorize it so that the longer calculation is always performed and
with an added blend in the end to merge the two different return values. This
is however unnecessary as the calculation will give the same result, and thus
the blend can be saved.
Also in any case it is actually a bit unsafe to vectorize as the performance
difference between the two branches is substantial, and it happens that in this
case the short-cut is likely to be valid most of the time, so a nonvectorized
loop might be faster than a vectorized one by doing a lot less.
The latter can be fixed, if the short-cut was also vectorized, for instance
making the test for 4 values at a time and skip the long route if none of them
need it.
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Subject: [Bug tree-optimization/85406] Unnecessary blend when vectorizing short-cutted calculations
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--- Comment #1 from Allan Jensen <linux at carewolf dot com> ---
Note it might be hard to figure out for the compiler that the result for a==255
will leave the input unchanged, but you can observe the same if you instead
test for a == 0 (and return 0). In that case the compiler should have enough
math deduction to be able to tell that the result of a==0 is always 0.
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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: Sun, 15 Apr 2018 15:31:00 -0000
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--- Comment #7 from vehre at gcc dot gnu.org ---
Backporting to gcc-6 and -7 is possible. The patch applies cleanly and all
regression tests pass.
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Subject: [Bug c++/85125] constant expression with const_cast UB does not emit error
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--- Comment #2 from John McFarlane <john at mcfarlane dot name> ---
Here are two more:
constexpr int dubious_increment(int i) { return ++i + ++i; }
static_assert(dubious_increment(0) == 3);
constexpr int dubious_increment(int i) { return ++++i; }
static_assert(dubious_increment(0) == 2);
The former might be a special case because it produces warnings when compiled
at a high-enough warning level (-Wall) but continues to compile nevertheless.
(Clan, warns at any level but also happily compiles.) The second just compiles
without warning no matter what.
Would these be classes as the same issue or should I submit a separate report?
Also, I'm not trying very hard to find these so I suspect there are more.
>From gcc-bugs-return-601632-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 15 19:15:41 2018
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From: "anlauf at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/85407] New: Replace gcc_assert in module.c:read_module by more helpful diagnostics
Date: Sun, 15 Apr 2018 19:15:00 -0000
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Bug ID: 85407
Summary: Replace gcc_assert in module.c:read_module by more
helpful diagnostics
Product: gcc
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Created attachment 43939
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43939&action=edit
Patch
When reading inconsistent module files, an assert can be triggered in
read_module(). The attached patch replaces the assert by an error message
which may be more informative for the user.
See https://gcc.gnu.org/ml/fortran/2018-04/msg00023.html and context
for discussion and proposed Changelog.
>From gcc-bugs-return-601633-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 15 21:26:39 2018
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Sun, 15 Apr 2018 21:26:00 -0000
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--- Comment #24 from Andrew Jenner <andrewjenner at gcc dot gnu.org> ---
Sorry for my lack of communication on this. Realistically, it doesn't look like
I'm going to be able to get the powerpcspe port to the appropriate state by the
GCC 8 rc1, so please feel free to deprecate or remove as you see fit. I will
continue to work on it with the aim of re-adding it in stage 1. Thanks.
>From gcc-bugs-return-601634-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 15 21:46:24 2018
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Subject: [Bug target/85080] [8 regression] gcc.dg/vect/costmodel/ppc/costmodel-pr37194.c fails starting with r248678
Date: Sun, 15 Apr 2018 21:46:00 -0000
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--- Comment #4 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
_Set8 wasn't supposed to be profitable before -- but this is an old test,
predating reasonable unaligned storage accesses with Power8 and later. We
should have vectorized both loops as soon as that came along, but without
Robin's changes we missed that opportunity. Both of them vectorizing now is
correct.
I'll see if I can alter the test to be executed only for targets with expensive
unaligned storage accesses.
>From gcc-bugs-return-601635-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 15 21:47:55 2018
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Subject: [Bug target/85080] [8 regression] gcc.dg/vect/costmodel/ppc/costmodel-pr37194.c fails starting with r248678
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|WAITING |NEW
>From gcc-bugs-return-601636-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Apr 15 22:43:04 2018
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From: "peter at cordes dot ca" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/81274] x86 optimizer emits unnecessary LEA instruction when using AVX intrinsics
Date: Sun, 15 Apr 2018 22:43:00 -0000
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Peter Cordes <peter at cordes dot ca> changed:
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CC| |peter at cordes dot ca
--- Comment #1 from Peter Cordes <peter at cordes dot ca> ---
This LEA stuff is part of what gcc does to align the stack by 32 for spilling
AVX locals.
Gcc's stack-align sequence is over-complicated and ties up an extra register
for the whole function (add volatile to the local and see the -O3 code). Or
at least it was; it seems gcc8 trunk just makes a stack frame with EBP / RBP
but references 32-byte aligned locals from aligned RSP instead of unaligned
RBP.
It used to copy the address of the return address to make a full copy of
ret-addr / saved-RBP for the aligned stack frame, which was super weird.
https://godbolt.org/g/RLJNtd. (With an alloca or something, gcc8 does the same
crazy stack-frame stuff as gcc7, otherwise it's much cleaner, like clang)
----
The actual bug here is that it's not fully optimized away when it turns out
that no 32-byte spills / reloads from locals are left in the function.
gcc for x86-64 sometimes has a few leftover instructions like that in more
complex functions using __m256; this is not exclusively an i386 problem, but
it's happens more easily for 32-bit it seems.
>From gcc-bugs-return-601637-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 00:20:39 2018
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Subject: [Bug c/51628] __attribute__((packed)) is unsafe in some cases
Date: Mon, 16 Apr 2018 00:20:00 -0000
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--- Comment #52 from W.H. Ding <dingcurie at icloud dot com> ---
(In reply to rguenther@suse.de from comment #48)
So, is there an old bug that covers my problem, or should I file a new one?
Thank you.
>From gcc-bugs-return-601638-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 01:13:03 2018
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Subject: [Bug c++/76995] type-id/expression in cstyle-cast are disambiguated incorrectly
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Richard Smith <richard-gccbugzilla at metafoo dot co.uk> changed:
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| |.co.uk
--- Comment #2 from Richard Smith <richard-gccbugzilla at metafoo dot co.uk> ---
This code is valid, and GCC is incorrect to reject it (as is Clang and EDG, of
course). The expression context
(T())
is ambiguous: it could either be a C-style cast to the function type 'T()' or a
parenthesized functional cast expression constructing an object of type 'T'. A
correct parser is required to look at what follows the construct to figure out
which of these two cases we're in: if the following tokens form a valid
cast-expression, then it's an (ill-formed) cast to a function type. Otherwise,
it's a parenthesized functional cast.
The following tokens are (args...), which do not form a valid cast-expression,
so the overall expression unambiguously parses the same as 'mytype()(args...)',
rather than as a type cast.
And for the record: I think this language rule is ridiculous. As far as I can
determine, the only cases that result in this ambiguity involve a choice
between a cast to a function type and something else; since a cast to a
function type is not meaningful, we could -- and arguably should -- change the
grammar to treat such cases as the non-cast interpretation. But I think that
argues even more strongly that GCC is wrong to reject this.
>From gcc-bugs-return-601639-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 02:01:43 2018
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Subject: [Bug testsuite/85326] `make check` fails with `--disable-bootstrap` and `--enable-languages=c`
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--- Comment #5 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Author: wschmidt
Date: Mon Apr 16 02:00:43 2018
New Revision: 259393
URL: https://gcc.gnu.org/viewcvs?rev=259393&root=gcc&view=rev
Log:
[gcc/testsuite]
2018-04-15 Bill Schmidt <wschmidt@linux.ibm.com>
PR testsuite/85326
* g++.dg/ext/undef-bool-1.C: New file.
* gcc.target/powerpc/powerpc.exp: Remove .C support.
* gcc.target/powerpc/undef-bool-1.C: Remove file.
Added:
trunk/gcc/testsuite/g++.dg/ext/undef-bool-1.C
Removed:
trunk/gcc/testsuite/gcc.target/powerpc/undef-bool-1.C
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/powerpc/powerpc.exp
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Subject: [Bug rtl-optimization/84842] ICE in verify_target_availability, at sel-sched.c:1569
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--- Comment #6 from Arseny Solokha <asolokha at gmx dot com> ---
Created attachment 43941
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c3 testcase dumps w/o -fselective-scheduling2
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Subject: [Bug rtl-optimization/84842] ICE in verify_target_availability, at sel-sched.c:1569
Date: Mon, 16 Apr 2018 02:19:00 -0000
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--- Comment #5 from Arseny Solokha <asolokha at gmx dot com> ---
Created attachment 43940
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c3 testcase dumps w/ -fselective-scheduling2
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Subject: [Bug rtl-optimization/83886] [8 Regression] ICE in cfg_layout_redirect_edge_and_branch, at cfgrtl.c:4433
Date: Mon, 16 Apr 2018 03:49:00 -0000
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--- Comment #3 from Arseny Solokha <asolokha at gmx dot com> ---
I cannot reproduce it anymore w/ gcc-8.0.0-alpha20180415 snapshot (r259389).
>From gcc-bugs-return-601643-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 05:51:54 2018
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Subject: [Bug target/71235] march=silvermont turns on aes by default
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--- Comment #4 from Jan De Kock <tjoener at gmail dot com> ---
@Jakub, isn't that the whole point? To be the lowest common denominator?
In the case of silvermont, the desktop SKUs (Bay-Trail-D) and mobile SKUs
(Bay-Trail-M), both don't support AES. That's a pretty large group if you ask
me
>From gcc-bugs-return-601644-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 06:01:00 2018
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Subject: [Bug target/84413] -mtune=skylake-avx512,cannonlake,icelake disable many optimizations
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--- Comment #3 from Julia Koval <jkoval at gcc dot gnu.org> ---
Author: jkoval
Date: Mon Apr 16 05:59:52 2018
New Revision: 259395
URL: https://gcc.gnu.org/viewcvs?rev=259395&root=gcc&view=rev
Log:
Add sse_unaligned_load_optimal and sse_unaligned_store_optimal to Skylake.
gcc/
PR target/84413
* config/i386/x86-tune.def (X86_TUNE_SSE_UNALIGNED_LOAD_OPTIMAL,
X86_TUNE_SSE_UNALIGNED_STORE_OPTIMAL): Add m_SKYLAKE_AVX512
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/x86-tune.def
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Subject: [Bug bootstrap/84856] Bootstrap failure on riscv: comparison of integer expressions of different signedness
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Kito Cheng <npickito at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |npickito at gmail dot com
--- Comment #7 from Kito Cheng <npickito at gmail dot com> ---
Hi Jim:
Your fixed changed the stack alignment at all, MIN_STACK_BOUNDARY is only used
in backed, but STACK_BOUNDARY will reference in may place to align the stack.
riscv32-elf-gcc gcc/testsuite/gcc.c-torture/execute/20010518-1.c -o - -S
...
.globl main
.type main, @function
main:
addi sp,sp,-40 <------
sw ra,36(sp)
sw s0,32(sp)
...
>From gcc-bugs-return-601646-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 07:13:14 2018
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Subject: [Bug rtl-optimization/83886] [8 Regression] ICE in cfg_layout_redirect_edge_and_branch, at cfgrtl.c:4433
Date: Mon, 16 Apr 2018 07:13:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Resolved in r259244.
>From gcc-bugs-return-601647-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 07:20:30 2018
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Subject: [Bug lto/82229] GCC7's LTO underperforms compared to GCC6
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #21 from Martin Liška <marxin at gcc dot gnu.org> ---
Ok, so you can use compiler hints line attribute always_inline or inline.
Apart from that you can use PGO (-fprofile-generate/-fprofile-use) to provide
even more hints.
For the analysis, please attach perf report log files for slow and fast
version. That should help us.
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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/85408] New: ICE in patch_jump_insn, at cfgrtl.c:1271
Date: Mon, 16 Apr 2018 07:27:00 -0000
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Bug ID: 85408
Summary: ICE in patch_jump_insn, at cfgrtl.c:1271
Product: gcc
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Target: powerpc-*-linux-gnu*, powerpcspe-*-linux-gnu*
gcc-8.0.0-alpha20180415 snapshot (r259389) ICEs when compiling the following
snippet w/ -O2 (-O3, -Ofast) -fselective-scheduling -fmodulo-sched
-fgraphite-identity -freorder-blocks-and-partition -fno-tree-loop-im:
int um;
void
od (void)
{
int vq = 0;
for (;;)
{
while (um < 1)
vq = (short int) um;
while (vq < 1)
{
for (um = 0; um < 2; ++um)
{
}
++vq;
}
}
}
% powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20180415 -O2 -fselective-scheduling
-fmodulo-sched -fgraphite-identity -freorder-blocks-and-partition
-fno-tree-loop-im -c smjpdkm5.c
during RTL pass: sched1
smjpdkm5.c: In function 'od':
smjpdkm5.c:22:1: internal compiler error: in patch_jump_insn, at cfgrtl.c:1271
}
^
0x74d7a2 patch_jump_insn
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgrtl.c:1271
0x74dd52 redirect_branch_edge
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgrtl.c:1297
0x74de22 rtl_redirect_edge_and_branch
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgrtl.c:1430
0x7315c8 redirect_edge_and_branch(edge_def*, basic_block_def*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfghooks.c:369
0x138eec9 try_forward_edges
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgcleanup.c:550
0x138eec9 try_optimize_cfg
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgcleanup.c:2942
0x13910ab cleanup_cfg(int)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgcleanup.c:3156
0xc1a15f sel_global_init
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7667
0xc1a15f run_selective_scheduling()
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7730
0xbf0d04 rest_of_handle_sched
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sched-rgn.c:3718
0xbf0d04 execute
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sched-rgn.c:3828
I've been hitting it for a while but am filing a PR only now, when many
selective scheduling fixes have actually started landing on the trunk.
>From gcc-bugs-return-601649-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 07:27:43 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85409] New: ICE in alloc_succs_info, at sel-sched-ir.c:4730
Date: Mon, 16 Apr 2018 07:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85409
Bug ID: 85409
Summary: ICE in alloc_succs_info, at sel-sched-ir.c:4730
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: 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*, powerpcspe-*-linux-gnu*
Created attachment 43942
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43942&action=edit
Testcase
gcc-8.0.0-alpha20180415 snapshot (r259389) ICEs when compiling the attached
snippet w/ -O1 -fselective-scheduling -fschedule-insns
-fvar-tracking-assignments.
% powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20180415 -O1 -fselective-scheduling
-fschedule-insns -fvar-tracking-assignments -w -c anctgs2z.c
during RTL pass: sched1
anctgs2z.c: In function 'ew':
anctgs2z.c:106:1: internal compiler error: in alloc_succs_info, at
sel-sched-ir.c:4730
}
^
0xbff5b2 alloc_succs_info
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched-ir.c:4730
0xbff5b2 compute_succs_info(rtx_insn*, short)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched-ir.c:4767
0xc0e2b1 compute_av_set_at_bb_end
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2752
0xc0e2b1 compute_av_set_inside_bb
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2981
0xc0e3f6 compute_av_set_at_bb_end
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2772
0xc0e3f6 compute_av_set_inside_bb
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2981
0xc0e3f6 compute_av_set_at_bb_end
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2772
0xc0e3f6 compute_av_set_inside_bb
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2981
0xc0e3f6 compute_av_set_at_bb_end
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2772
0xc0e3f6 compute_av_set_inside_bb
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2981
0xc0e3f6 compute_av_set_at_bb_end
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2772
0xc0e3f6 compute_av_set_inside_bb
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2981
0xc0e3f6 compute_av_set_at_bb_end
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2772
0xc0e3f6 compute_av_set_inside_bb
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2981
0xc0e3f6 compute_av_set_at_bb_end
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2772
0xc0e3f6 compute_av_set_inside_bb
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2981
0xc0e3f6 compute_av_set_at_bb_end
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2772
0xc0e3f6 compute_av_set_inside_bb
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2981
0xc0e3f6 compute_av_set_at_bb_end
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2772
0xc0e3f6 compute_av_set_inside_bb
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:2981
I've been hitting it for a while but am filing a PR only now, when many
selective scheduling fixes have actually started landing on the trunk.
>From gcc-bugs-return-601650-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 08:24:40 2018
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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/85410] New: ICE in create_block_for_bookkeeping, at sel-sched.c:4563
Date: Mon, 16 Apr 2018 08:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85410
Bug ID: 85410
Summary: ICE in create_block_for_bookkeeping, at
sel-sched.c:4563
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
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Target: powerpc-*-linux-gnu
gcc-8.0.0-alpha20180415 snapshot (r259389) ICEs when compiling the following
snippet w/ -O3 (-Ofast) -fselective-scheduling -fvar-tracking-assignments:
void
nl (int fg, int lb)
{
long long unsigned int xj = ~0;
double vu;
while ((lb - (!fg + 1)) != xj)
lb = fg = vu;
}
% powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20180415 -O3 -fselective-scheduling
-fvar-tracking-assignments -w -c chreru5r.c
during RTL pass: sched1
chreru5r.c: In function 'nl':
chreru5r.c:9:1: internal compiler error: in create_block_for_bookkeeping, at
sel-sched.c:4563
}
^
0xc0f988 create_block_for_bookkeeping
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:4563
0xc0f988 find_place_for_bookkeeping
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:4700
0xc0f988 generate_bookkeeping_insn
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:4800
0xc0f988 move_op_at_first_insn
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6077
0xc10243 code_motion_path_driver
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6669
0xc10bc9 code_motion_process_successors
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6356
0xc10bc9 code_motion_path_driver
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6622
0xc10bc9 code_motion_process_successors
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6356
0xc10bc9 code_motion_path_driver
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6622
0xc10bc9 code_motion_process_successors
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6356
0xc10bc9 code_motion_path_driver
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6622
0xc11415 move_op
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6714
0xc11415 move_exprs_to_boundary
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:5237
0xc11415 schedule_expr_on_boundary
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:5450
0xc15488 fill_insns
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:5592
0xc172ce schedule_on_fences
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7366
0xc172ce sel_sched_region_2
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7504
0xc18341 sel_sched_region_1
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7546
0xc19935 sel_sched_region(int)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7647
0xc1a289 run_selective_scheduling()
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7733
>From gcc-bugs-return-601651-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 08:25:29 2018
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Subject: [Bug c++/76995] type-id/expression in cstyle-cast are disambiguated incorrectly
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|RESOLVED |NEW
Last reconfirmed| |2018-04-16
Resolution|INVALID |---
Ever confirmed|0 |1
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Confirmed then.
>From gcc-bugs-return-601652-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 08:32:03 2018
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Subject: [Bug c++/85112] [8 Regression] ICE with invalid constexpr
Date: Mon, 16 Apr 2018 08:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85112
--- Comment #3 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Mon Apr 16 08:31:23 2018
New Revision: 259397
URL: https://gcc.gnu.org/viewcvs?rev=259397&root=gcc&view=rev
Log:
2018-04-16 Paolo Carlini <paolo.carlini@oracle.com>
Jason Merrill <jason@redhat.com>
PR c++/85112
* convert.c (convert_to_integer_1): Use direct recursion for
enumeral types and types with a precision less than the number
of bits in their mode.
/testsuite
2018-04-16 Paolo Carlini <paolo.carlini@oracle.com>
Jason Merrill <jason@redhat.com>
PR c++/85112
* g++.dg/cpp0x/pr85112.C: New.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/pr85112.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/convert.c
trunk/gcc/testsuite/ChangeLog
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From: "abel at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/85408] ICE in patch_jump_insn, at cfgrtl.c:1271
Date: Mon, 16 Apr 2018 08:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85408
Andrey Belevantsev <abel at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-16
CC| |abel at gcc dot gnu.org,
| |amonakov at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Andrey Belevantsev <abel at gcc dot gnu.org> ---
We fail when trying to call cleanup_cfg. The edge we're trying to redirect
looks like an indirect jump so I'm not sure why it's not a computed_jump_p
(tablejump?)
(gdb) p insn
$11 = (rtx_insn *) 0x7ffff673c240
(gdb) pr
warning: Expression is not an assignment (and might have no effect)
(jump_insn/j 93 92 86 13 (set (pc)
(reg:SI 160)) 628 {*indirect_jumpsi}
(expr_list:REG_DEAD (reg:SI 160)
(nil))
-> 17)
(gdb) p computed_jump_p (insn)
$12 = 0
>From gcc-bugs-return-601654-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 08:34:00 2018
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Subject: [Bug rtl-optimization/85409] [8 Regression] ICE in alloc_succs_info, at sel-sched-ir.c:4730
Date: Mon, 16 Apr 2018 08:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85409
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Version|unknown |8.0
Keywords|ice-on-invalid-code |ice-on-valid-code
Last reconfirmed| |2018-04-16
CC| |abel at gcc dot gnu.org,
| |amonakov at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
Ever confirmed|0 |1
Summary|ICE in alloc_succs_info, at |[8 Regression] ICE in
|sel-sched-ir.c:4730 |alloc_succs_info, at
| |sel-sched-ir.c:4730
Target Milestone|--- |8.0
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
With -m32 -mcpu=e300c3 -O1 -fselective-scheduling -fschedule-insns
-fvar-tracking-assignments
I've bisected it to r259231. It requires explicit -fvar-tracking-assignments
people rarely use, so I think this doesn't deserve to be a P1.
>From gcc-bugs-return-601655-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 08:38:13 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85409] [8 Regression] ICE in alloc_succs_info, at sel-sched-ir.c:4730
Date: Mon, 16 Apr 2018 08:38:00 -0000
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--- Comment #2 from Arseny Solokha <asolokha at gmx dot com> ---
(In reply to Jakub Jelinek from comment #1)
> I've bisected it to r259231.
Interesting. I reduced it from a file I have since 8.0.0-alpha20180121 snapshot
timeframe, and the backtrace was the same back then.
>From gcc-bugs-return-601656-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 08:46:49 2018
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Subject: [Bug rtl-optimization/85409] [8 Regression] ICE in alloc_succs_info, at sel-sched-ir.c:4730
Date: Mon, 16 Apr 2018 08:46:00 -0000
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--- Comment #3 from Andrey Belevantsev <abel at gcc dot gnu.org> ---
This one is cool. We hit an assert saying we cannot hold of successor info
anymore. The succs vector size is of max_ws (maximum lookahead) + 1, but guess
what, there's a lot of debug insns and these are not counted against windowsize
when computing the availability set because of:
2949 if (DEBUG_INSN_P (last_insn))
2950 continue;
2951
2952 if (end_ws > max_ws)
2953 {
2954 /* We can reach max lookahead size at bb_header, so clean av_set
2955 first. */
2956 INSN_WS_LEVEL (last_insn) = global_level;
2957
2958 if (sched_verbose >= 6)
2959 sel_print ("Insn %d is beyond the software lookahead window
size\n",
2960 INSN_UID (last_insn));
2961 break;
2962 }
2963
2964 end_ws++;
Thoughts?
>From gcc-bugs-return-601657-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 08:51:55 2018
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Subject: [Bug rtl-optimization/85409] [8 Regression] ICE in alloc_succs_info, at sel-sched-ir.c:4730
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The general rule is that DEBUG_INSN_P should not affect code-gen related
decisions and the compiler needs to cope with them as best as it can when the
decisions have been made. sel-sched already violates that though. You could
have separate lookahead for non-debug and debug insns (or space in there),
though of course need to handle the case when there are really way too many
debug insns among very few other insns (you can have millions of debug insns
with no other insns in between in corner cases).
>From gcc-bugs-return-601658-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 08:52:33 2018
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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85400] R_SPARC_TLS_*: invalid relocations generated for optimized builds on sparc
Date: Mon, 16 Apr 2018 08:52:00 -0000
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-04-16
CC| |ebotcazou at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> In Solaris 10 & 11 using GCC versions 4.8, 4.9.2, 7.2.0 I get relocation
> errors when thread_local variables are used in a struct/class. Example code
> that reproduces the problem:
>
> > struct Test {
> > int blah( int y ) {
> > thread_local mything = 3;
> > mything = y > 0 ? y : mything;
> > return mything;
> > }
> > };
> > int stuff( Test& test, int y ) {
> > return test.blah(y);
> > }
This doesn't compile for me:
pr85400.C: In member function 'int Test::blah(int)':
pr85400.C:5:18: error: 'mything' does not name a type
thread_local mything = 3;
^~~~~~~
pr85400.C:6:5: error: 'mything' was not declared in this scope
mything = y > 0 ? y : mything;
^~~~~~~
> * The compilers I built and those produced by OpenCSW use the Solaris
> assembler (/usr/ccs/bin/as) instead of gas.
Do you have local patches? My compiler is the stock GCC 8.x:
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/nfs/homes/homes/botcazou/gcc-head/install_sparc/bin/../libexec/gcc/sparc-sun-solaris2.10/8.0.1/lto-wrapper
Target: sparc-sun-solaris2.10
Configured with: /homes/botcazou/gcc-head/src/configure
--build=sparc-sun-solaris2.10 --prefix=/homes/botcazou/gcc-head/install_sparc
--with-as=/homes/botcazou/gcc-head/install_sparc/bin/as
--with-gmp=/homes/botcazou/support/sparc
--with-mpfr=/homes/botcazou/support/sparc
--with-mpc=/homes/botcazou/support/sparc --enable-languages=all --disable-nls
Thread model: posix
gcc version 8.0.1 20180325 (experimental) (GCC)
>From gcc-bugs-return-601659-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 08:56:44 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85112] [8 Regression] ICE with invalid constexpr
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |FIXED
--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed.
>From gcc-bugs-return-601660-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 09:23:22 2018
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Subject: [Bug libgomp/85411] New: [openacc] Move GOMP_OPENACC_DIM parsing out of nvptx plugin
Date: Mon, 16 Apr 2018 09:23:00 -0000
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Bug ID: 85411
Summary: [openacc] Move GOMP_OPENACC_DIM parsing out of nvptx
plugin
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: trivial
Priority: P3
Component: libgomp
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
CC: jakub at gcc dot gnu.org
Target Milestone: ---
As mentioned here ( https://gcc.gnu.org/ml/gcc-patches/2017-02/msg01020.html ):
...
the GOMP_OPENACC_DIM parsing conceptually belongs into generic libgomp code,
instead of the nvptx plugin. (But that aspect can be cleaned up later:
currently, the nvptx plugin is the only one supporting/using it.)
...
[ And re-iterated here: PR85129 comment 3 ]
>From gcc-bugs-return-601661-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 09:25:03 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/85129] [openacc] Document GOMP_OPENACC_DIM
Date: Mon, 16 Apr 2018 09:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85129
--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Thomas Schwinge from comment #3)
> (In reply to Tom de Vries from comment #2)
> > GOMP_OPENACC_DIM seems to be the odd one here, and we should document
> > the non-standard behaviour that it supports being set in main using setenv.
>
> Amongst other things, in
> <http://mid.mail-archive.com/87r32z87mx.fsf@euler.schwinge.homeip.net> I
> wondered whether "GOMP_OPENACC_DIM parsing conceptually belongs into generic
> libgomp code, instead of the nvptx plugin. (But [...] currently, the nvptx
> plugin is the only one supporting/using it.)".
>
Ack. Filed PR85411 - "[openacc] Move GOMP_OPENACC_DIM parsing out of nvptx
plugin"
>From gcc-bugs-return-601662-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 09:29:32 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/85412] New: [8 Regression] ICE in put_TImodes, at sel-sched.c:7191
Date: Mon, 16 Apr 2018 09:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85412
Bug ID: 85412
Summary: [8 Regression] ICE in put_TImodes, at sel-sched.c:7191
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
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Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
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Target: x86_64-pc-linux-gnu
gcc-8.0.0-alpha20180415 snapshot (r259389) ICEs when compiling the following
snippet w/ -march=haswell -O2 (-O3) -fselective-scheduling2
-fsel-sched-pipelining -fno-tree-ch -fno-tree-loop-im:
int n7;
int
rf (double as, long int u1, int sp, int fy)
{
int ku = 0, us = 1, lo = sp;
while (fy < 1)
{
const long int pg = 5;
const unsigned int g5 = 3;
ku = as + us;
if (fy == 0)
n7 /= u1;
else
{
const long long unsigned int w7 = 3;
us = 0;
as = u1 / w7 + u1;
}
fy = sp % pg + n7 / g5;
}
if (ku < 1)
lo = u1;
return lo;
}
% x86_64-pc-linux-gnu-gcc-8.0.0-alpha20180415 -march=haswell -O2
-fselective-scheduling2 -fsel-sched-pipelining -fno-tree-ch -fno-tree-loop-im
-c t4byfoly.c
during RTL pass: sched2
t4byfoly.c: In function 'rf':
t4byfoly.c:32:1: internal compiler error: in put_TImodes, at sel-sched.c:7191
}
^
0x64f37b put_TImodes
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7191
0x64f37b sel_region_target_finish
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7238
0x64f37b sel_region_finish
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7289
0x64f37b sel_sched_region(int)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7658
0xc6ef38 run_selective_scheduling()
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7733
0xc4e9a5 rest_of_handle_sched2
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sched-rgn.c:3732
0xc4e9a5 execute
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sched-rgn.c:3876
I've been hitting it for a while but am filing a PR only now, when many
selective scheduling fixes have actually started landing on the trunk.
>From gcc-bugs-return-601663-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 09:31:54 2018
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From: "dilyan.palauzov at aegee dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/85413] New: "./configure --with-build-config=bootstrap-lto " != "BOOT_CFLAGS +=-flto "
Date: Mon, 16 Apr 2018 09:31:00 -0000
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Bug ID: 85413
Summary: "./configure --with-build-config=bootstrap-lto " !=
"BOOT_CFLAGS +=-flto "
Product: gcc
Version: 7.3.1
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https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/doc/install.texi;h=64ad2445a335f270200e359812bc9d2213bd2405;hb=HEAD#l2457
says:
./configure --with-build-config=bootstrap-lto is the same as adding -flto to
BOOT_CFLAGS, but providing that config/bootstrap-lto.mk contains more code than
just adding -flto, this seems not to be correct. Moreover the text in
gcc/doc/instal.texi concerning the equivalence originates from 2010, but
config/bootstrap-lto.ml was last modified in 2014. In 2010 bootstrap-lto.m4
indeed only added -flto, not it appends also =jobserver.
>From gcc-bugs-return-601664-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 09:37:55 2018
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Subject: [Bug target/83009] gcc.target/aarch64/store_v2vec_lanes.c fails with -mabi=ilp32
Date: Mon, 16 Apr 2018 09:37:00 -0000
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--- Comment #7 from avieira at gcc dot gnu.org ---
Bootstrap and regression testing looks good. Ill put the patch up on the ML
when we enter stage 1 again.
>From gcc-bugs-return-601665-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 09:42:35 2018
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/85408] ICE in patch_jump_insn, at cfgrtl.c:1271
Date: Mon, 16 Apr 2018 09:42:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hubicka at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This is a complete mess.
bb-reorder.c has fix_crossing_unconditional_branches for targets that don't
define HAS_LONG_UNCOND_BRANCHES to true.
One thing which isn't clear is if it is right that these branches have
JUMP_LABEL attached to them. If not, then e.g.
--- gcc/bb-reorder.c.jj 2018-04-13 21:49:36.000000000 +0200
+++ gcc/bb-reorder.c 2018-04-16 11:18:33.328681163 +0200
@@ -2178,7 +2178,7 @@ fix_crossing_unconditional_branches (voi
label = JUMP_LABEL (last_insn);
label_addr = gen_rtx_LABEL_REF (Pmode, label);
- LABEL_NUSES (label) += 1;
+ LABEL_NUSES (label)++;
/* Get a register to use for the indirect jump. */
@@ -2187,7 +2187,8 @@ fix_crossing_unconditional_branches (voi
/* Generate indirect the jump sequence. */
start_sequence ();
- emit_move_insn (new_reg, label_addr);
+ rtx_insn *last = emit_move_insn (new_reg, label_addr);
+ add_reg_note (last, REG_LABEL_OPERAND, label);
emit_indirect_jump (new_reg);
indirect_jump_sequence = get_insns ();
end_sequence ();
@@ -2210,9 +2211,6 @@ fix_crossing_unconditional_branches (voi
emit_insn_before (indirect_jump_sequence, last_insn);
delete_insn (last_insn);
- JUMP_LABEL (jump_insn) = label;
- LABEL_NUSES (label)++;
-
/* Make BB_END for cur_bb be the jump instruction (NOT the
barrier instruction at the end of the sequence...). */
fixes this ICE. Another thing is that these indirect jumps are shortly
afterwards "optimized" into direct jumps anyway, even without the above patch
with the same testcase e.g. without -fmodulo-sched option, with the patch even
with that option. The thing is, with hot/cold partitioning we don't really
know how far from each other the hot and cold partitions will be. On PowerPC
the direct branch is I think 26-bit (with bottom two bits assumed to be 0 and
reused for some flags) and thus considered insufficient. x86_64 in the default
model has both conditional and unconditinal jumps with signed 32-bit immediates
and thus considered ok.
So, no matter whether we emit the JUMP_LABEL or not on the indirect jump, we
should also make sure we don't turn those indirect jumps into direct jumps if
they are crossing and !HAVE_LONG_UNCOND_BRANCH.
Lastly, HAVE_LONG_UNCOND_BRANCH true is probably not ok for x86_64
-mcmodel=large.
Honza, thoughts on this?
>From gcc-bugs-return-601666-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 09:44:39 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: Mon, 16 Apr 2018 09:44:00 -0000
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2018-04/msg00747.html
>From gcc-bugs-return-601667-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 10:08:14 2018
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Subject: [Bug c++/84733] [8 Regression] internal compiler error: Segmentation fault (check_local_shadow())
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84733
--- Comment #10 from Paolo Carlini <paolo.carlini at oracle dot com> ---
In fact, if I slightly tweak the testcase to avoid the error by defining 'e' we
would ICE again, because binding->type is found null without a preceding
diagnostic. Thus I wonder if my patchlet in Comment 7 is actually correct or is
papering over a deeper issue?!?
struct c {
~c();
} b;
void f() {
try {
d:
;
} catch (int) {
}
decltype(b) a;
int e;
struct e { } f;
}
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Subject: [Bug c++/84733] [8 Regression] internal compiler error: Segmentation fault (check_local_shadow())
Date: Mon, 16 Apr 2018 10:16:00 -0000
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--- Comment #11 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Nope. Something deeper. The new testcase would be accepted but the declaration
of the int variable 'e' would not be usable, would be ignored.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85412] [8 Regression] ICE in put_TImodes, at sel-sched.c:7191
Date: Mon, 16 Apr 2018 10:41:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |abel at gcc dot gnu.org,
| |amonakov at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Can't reproduce in my bisect seed, so can't bisect. Can reproduce with current
trunk though.
7188 clock = INSN_SCHED_CYCLE (insn);
7189 cost = (last_clock == -1) ? 1 : clock - last_clock;
7190
7191 gcc_assert (cost >= 0);
clock is 0, last_clock is 37, so cost is -37.
Though, s_i_d array has just length of 52 and insn here (created by
#1 0x0000000000acef21 in emit_insn (x=0x7fffefdfef40) at
../../gcc/emit-rtl.c:5116
#2 0x0000000000f56d77 in create_insn_rtx_from_pattern (pattern=0x7fffefdfef40,
label=0x0) at ../../gcc/sel-sched-ir.c:5753
#3 0x0000000000f56f09 in create_copy_of_insn_rtx (insn_rtx=0x7fffefc58ec0) at
../../gcc/sel-sched-ir.c:5798
#4 0x0000000000f686b1 in emit_bookkeeping_insn
(place_to_insert=0x7fffefe070c0, c_expr=0x7fffffffd8c0, new_seqno=100)
at ../../gcc/sel-sched.c:4768
#5 0x0000000000f6881e in generate_bookkeeping_insn (c_expr=0x7fffffffd8c0,
e1=<edge 0x7fffefddc600 (9 -> 4)>, e2=<edge 0x7fffefddc600 (9 -> 4)>)
at ../../gcc/sel-sched.c:4805
#6 0x0000000000f6b58b in move_op_at_first_insn (insn=0x7fffefdf88c0,
lparams=0x7fffffffd440, static_params=0x7fffffffd7e0)
at ../../gcc/sel-sched.c:6077
#7 0x0000000000f6c2b2 in code_motion_path_driver (insn=0x7fffefdf88c0,
orig_ops=0x0, path=0x2d193d0, local_params_in=0x7fffffffd440,
static_params=0x7fffffffd7e0) at ../../gcc/sel-sched.c:6669
#8 0x0000000000f6bad6 in code_motion_process_successors (insn=0x7fffefdebe58,
orig_ops=0x2d19f88, path=0x2d193d0, static_params=0x7fffffffd7e0)
at ../../gcc/sel-sched.c:6356
#9 0x0000000000f6c199 in code_motion_path_driver (insn=0x7fffefdebe58,
orig_ops=0x2d19f88, path=0x2d193d0, local_params_in=0x7fffffffd630,
static_params=0x7fffffffd7e0) at ../../gcc/sel-sched.c:6622
#10 0x0000000000f6bad6 in code_motion_process_successors (insn=0x7fffefdebea0,
orig_ops=0x2d1b4a0, path=0x2d1bb30, static_params=0x7fffffffd7e0)
at ../../gcc/sel-sched.c:6356
#11 0x0000000000f6c199 in code_motion_path_driver (insn=0x7fffefdebea0,
orig_ops=0x2d1b4a0, path=0x2d1bb30, local_params_in=0x7fffffffd7b0,
static_params=0x7fffffffd7e0) at ../../gcc/sel-sched.c:6622
#12 0x0000000000f6c3af in move_op (insn=0x7fffefc58bc0, orig_ops=0x2d1b860,
expr_vliw=0x2d1bef8, dest=0x0, c_expr=0x7fffffffd8c0,
should_move=0x7fffffffd89a) at ../../gcc/sel-sched.c:6714
#13 0x0000000000f696eb in move_exprs_to_boundary (bnd=0x2d19360,
expr_vliw=0x2d1bef8, expr_seq=0x2d1b860, c_expr=0x7fffffffd8c0)
at ../../gcc/sel-sched.c:5237
#14 0x0000000000f6a24b in schedule_expr_on_boundary (bnd=0x2d19360,
expr_vliw=0x2d1bef8, seqno=-13) at ../../gcc/sel-sched.c:5450
#15 0x0000000000f6a6ec in fill_insns (fence=0x2d1b598, seqno=-13,
scheduled_insns_tailpp=0x7fffffffda90) at ../../gcc/sel-sched.c:5592
#16 0x0000000000f6dbbd in schedule_on_fences (fences=0x2d1a2d0, max_seqno=32,
scheduled_insns_tailpp=0x7fffffffda90) at ../../gcc/sel-sched.c:7366
#17 0x0000000000f6e0ae in sel_sched_region_2 (orig_max_seqno=34) at
../../gcc/sel-sched.c:7504
#18 0x0000000000f6e22d in sel_sched_region_1 () at ../../gcc/sel-sched.c:7546
#19 0x0000000000f6e683 in sel_sched_region (rgn=0) at
../../gcc/sel-sched.c:7647
has INSN_LUID 0.
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Subject: [Bug libgomp/85129] [openacc] Document GOMP_OPENACC_DIM
Date: Mon, 16 Apr 2018 11:03:00 -0000
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--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> I. trunk
>
> The GOMP_OPENACC_DIM environment variable is not documented (it should have
> an entry in libgomp.texi at 'OpenACC Environment Variables').
Atm, in trunk, fopenacc-dim does not yet support the '-' syntax, so the only
dimension that GOMP_OPENACC_DIM can influence is gang.
It probably doesn't make any sense to document GOMP_OPENACC_DIM until it's
fully functioning.
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Subject: [Bug target/85414] New: [8 Regression] ICE: in ix86_expand_prologue, at config/i386/i386.c:13810 with -Og -fgcse
Date: Mon, 16 Apr 2018 11:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85414
Bug ID: 85414
Summary: [8 Regression] ICE: in ix86_expand_prologue, at
config/i386/i386.c:13810 with -Og -fgcse
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
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Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 43943
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43943&action=edit
reduced testcase
Compiler output:
$ x86_64-pc-linux-gnu-gcc -Og -fgcse testcase.c
during RTL pass: pro_and_epilogue
testcase.c: In function 'foo':
testcase.c:6:1: internal compiler error: in ix86_expand_prologue, at
config/i386/i386.c:13810
}
^
0x10fdb4b ix86_expand_prologue()
/repo/gcc-trunk/gcc/config/i386/i386.c:13810
0x13b584a gen_prologue()
/repo/gcc-trunk/gcc/config/i386/i386.md:13246
0x10d65d8 target_gen_prologue
/repo/gcc-trunk/gcc/config/i386/i386.md:19662
0xa0b127 make_prologue_seq
/repo/gcc-trunk/gcc/function.c:5926
0xa0b2c4 thread_prologue_and_epilogue_insns()
/repo/gcc-trunk/gcc/function.c:6043
0xa0be22 rest_of_handle_thread_prologue_and_epilogue
/repo/gcc-trunk/gcc/function.c:6534
0xa0be22 execute
/repo/gcc-trunk/gcc/function.c:6576
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.
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-259397-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-259397-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
gcc version 8.0.1 20180416 (experimental) (GCC)
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Subject: [Bug target/85414] [8 Regression] ICE: in ix86_expand_prologue, at config/i386/i386.c:13810 with -Og -fgcse
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-16
CC| |edlinger at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
Target Milestone|--- |8.0
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r248798.
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Subject: [Bug target/84945] [8 Regression] UBSAN: gcc/config/i386/i386.c:33312:22: runtime error: shift exponent 32 is too large for 32-bit type 'int'
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--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Apr 16 11:22:40 2018
New Revision: 259398
URL: https://gcc.gnu.org/viewcvs?rev=259398&root=gcc&view=rev
Log:
PR target/84945
* config/i386/cpuinfo.c (set_feature): Wrap into do while (0) to avoid
-Wdangling-else warnings. Mask shift counts to avoid
-Wshift-count-negative and -Wshift-count-overflow false positives.
Modified:
trunk/libgcc/ChangeLog
trunk/libgcc/config/i386/cpuinfo.c
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Subject: [Bug target/84331] Execution failures on Skylake server with -march=native
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84331
--- Comment #1 from Julia Koval <jkoval at gcc dot gnu.org> ---
Author: jkoval
Date: Mon Apr 16 11:23:55 2018
New Revision: 259399
URL: https://gcc.gnu.org/viewcvs?rev=259399&root=gcc&view=rev
Log:
Fixed g++.dg/ext/mv16.C with -march=native.
gcc/
PR target/84331
* gcc/config.gcc: Support "skylake".
* gcc/config/i386/i386-c.c (ix86_target_macros_internal): Handle
PROCESSOR_SKYLAKE.
* gcc/config/i386/i386.c (m_SKYLAKE): Define.
(processor_target_table): Add "skylake".
(ix86_option_override_internal): Add "skylake".
(get_builtin_code_for_version): Handle PROCESSOR_SKYLAKE,
PROCESSOR_CANNONLAKE.
(get_builtin_code_for_version): Fix priority for
PROCESSOR_ICELAKE_CLIENT, PROCESSOR_ICELAKE_SERVER,
PROCESSOR_SKYLAKE-AVX512.
* gcc/config/i386/i386.h (processor_costs): Define TARGET_SKYLAKE.
(processor_type): Add PROCESSOR_SKYLAKE.
gcc/testsuite/
PR target/84331
* gcc/testsuite/gcc.target/i386/funcspec-56.inc: Test arch=skylake.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config.gcc
trunk/gcc/config/i386/i386-c.c
trunk/gcc/config/i386/i386.c
trunk/gcc/config/i386/i386.h
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/i386/funcspec-56.inc
>From gcc-bugs-return-601675-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 11:28:44 2018
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Subject: [Bug ipa/83983] FAIL: g++.dg/lto/pr83121 (test for LTO warnings, pr83121_0.C line 8)
Date: Mon, 16 Apr 2018 11:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83983
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
--- Comment #11 from Martin Liška <marxin at gcc dot gnu.org> ---
I worked on that with Honza and we have proper fix. Let me test.
>From gcc-bugs-return-601676-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 11:29:24 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85415] New: internal compiler error: in finish_member_declaration, at cp/semantics.c:2984
Date: Mon, 16 Apr 2018 11:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85415
Bug ID: 85415
Summary: internal compiler error: in finish_member_declaration,
at cp/semantics.c:2984
Product: gcc
Version: 7.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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Created attachment 43944
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43944&action=edit
testcase triggering error
Not sure if this is similar to #82722.
Seems to happen when trying to use fold expressions, but the same thing
occurred when I used std::make_tuple to execute over all tuple members.
The same code compiles in clang 6.0.0 and MSVC
Here is the full output, with the testcase as an attachment
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --enable-multilib --disable-werror
--enable-checking=release --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 7.3.1 20180312 (GCC)
COLLECT_GCC_OPTIONS='-v' '-Wall' '-Wextra' '-save-temps' '-std=c++1z' '-o'
'testcase' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/cc1plus -E -quiet -v -D_GNU_SOURCE
testcase.cpp -mtune=generic -march=x86-64 -std=c++1z -Wall -Wextra
-fpch-preprocess -o testcase.ii
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../include/c++/7.3.1
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../include/c++/7.3.1/x86_64-pc-linux-gnu
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../include/c++/7.3.1/backward
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/include
/usr/local/include
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/include-fixed
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-Wall' '-Wextra' '-save-temps' '-std=c++1z' '-o'
'testcase' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/cc1plus -fpreprocessed testcase.ii
-quiet -dumpbase testcase.cpp -mtune=generic -march=x86-64 -auxbase testcase
-Wall -Wextra -std=c++1z -version -o testcase.s
GNU C++14 (GCC) version 7.3.1 20180312 (x86_64-pc-linux-gnu)
compiled by GNU C version 7.3.1 20180312, GMP version 6.1.2, MPFR
version 4.0.1, MPC version 1.1.0, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++14 (GCC) version 7.3.1 20180312 (x86_64-pc-linux-gnu)
compiled by GNU C version 7.3.1 20180312, GMP version 6.1.2, MPFR
version 4.0.1, MPC version 1.1.0, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 3fb60f63f2e4dccab1b015b716b8b627
testcase.cpp: In instantiation of
‘tuple_vector<Ts>::clear_all()::<lambda(auto:1& ...)> [with auto:1 =
{std::vector<int, std::allocator<int> >, std::vector<bool, std::allocator<bool>
>, std::vector<double, std::allocator<double> >}; Ts = {int, bool, double}]’:
/usr/include/c++/7.3.1/type_traits:2428:26: required by substitution of
‘template<class _Fn, class ... _Args> static std::__result_of_success<decltype
(declval<_Fn>()((declval<_Args>)()...)), std::__invoke_other>
std::__result_of_other_impl::_S_test(int) [with _Fn =
tuple_vector<Ts>::clear_all() [with Ts = {int, bool, double}]::<lambda(auto:1&
...)>; _Args = {std::vector<int, std::allocator<int> >&, std::vector<bool,
std::allocator<bool> >&, std::vector<double, std::allocator<double> >&}]’
/usr/include/c++/7.3.1/type_traits:2439:55: required from ‘struct
std::__result_of_impl<false, false, tuple_vector<Ts>::clear_all() [with Ts =
{int, bool, double}]::<lambda(auto:1& ...)>, std::vector<int,
std::allocator<int> >&, std::vector<bool, std::allocator<bool> >&,
std::vector<double, std::allocator<double> >&>’
/usr/include/c++/7.3.1/type_traits:2444:12: required from ‘struct
std::__invoke_result<tuple_vector<Ts>::clear_all() [with Ts = {int, bool,
double}]::<lambda(auto:1& ...)>, std::vector<int, std::allocator<int> >&,
std::vector<bool, std::allocator<bool> >&, std::vector<double,
std::allocator<double> >&>’
/usr/include/c++/7.3.1/bits/invoke.h:89:5: required by substitution of
‘template<class _Callable, class ... _Args> constexpr typename
std::__invoke_result<_Functor, _ArgTypes>::type std::__invoke(_Callable&&,
_Args&& ...) [with _Callable = tuple_vector<Ts>::clear_all() [with Ts = {int,
bool, double}]::<lambda(auto:1& ...)>; _Args = {std::vector<int,
std::allocator<int> >&, std::vector<bool, std::allocator<bool> >&,
std::vector<double, std::allocator<double> >&}]’
/usr/include/c++/7.3.1/tuple:1662:27: required from ‘constexpr decltype(auto)
std::__apply_impl(_Fn&&, _Tuple&&, std::index_sequence<_Idx ...>) [with _Fn =
tuple_vector<Ts>::clear_all() [with Ts = {int, bool, double}]::<lambda(auto:1&
...)>; _Tuple = std::tuple<std::vector<int, std::allocator<int> >,
std::vector<bool, std::allocator<bool> >, std::vector<double,
std::allocator<double> > >&; long unsigned int ..._Idx = {0, 1, 2};
std::index_sequence<_Idx ...> = std::integer_sequence<long unsigned int, 0, 1,
2>]’
/usr/include/c++/7.3.1/tuple:1671:31: required from ‘constexpr decltype(auto)
std::apply(_Fn&&, _Tuple&&) [with _Fn = tuple_vector<Ts>::clear_all() [with Ts
= {int, bool, double}]::<lambda(auto:1& ...)>; _Tuple =
std::tuple<std::vector<int, std::allocator<int> >, std::vector<bool,
std::allocator<bool> >, std::vector<double, std::allocator<double> > >&]’
testcase.cpp:17:19: required from ‘void tuple_vector<Ts>::clear_all() [with
Ts = {int, bool, double}]’
testcase.cpp:28:27: required from here
testcase.cpp:19:84: internal compiler error: in finish_member_declaration, at
cp/semantics.c:2984
(clear<typename
std::remove_reference_t<decltype(vectors)>::value_type>(), ...);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.archlinux.org/> for instructions.
>From gcc-bugs-return-601677-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 11:32:02 2018
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Subject: [Bug middle-end/85403] internal compiler error: ... config/i386/i386.c:32347
Date: Mon, 16 Apr 2018 11:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85403
--- Comment #1 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Mon Apr 16 11:31:22 2018
New Revision: 259400
URL: https://gcc.gnu.org/viewcvs?rev=259400&root=gcc&view=rev
Log:
i386: Check error_mark_node in multiversioning
Since CET is applied to the whole program, it is correct to disallow
-fcf-protection=full without -mcet. But compiler shouldn't crash.
gcc/
PR target/85403
* config/i386/i386.c (get_builtin_code_for_version): Check
error_mark_node.
gcc/testsuite/
PR target/85403
* gcc.target/i386/pr85403.c: New test.
---
gcc/config/i386/i386.c | 2 ++
gcc/testsuite/g++.dg/ext/mv1.C | 2 +-
gcc/testsuite/g++.dg/ext/mv14.C | 2 +-
gcc/testsuite/g++.dg/ext/mv15.C | 2 +-
gcc/testsuite/g++.dg/ext/mv16.C | 2 +-
gcc/testsuite/g++.dg/ext/mv17.C | 2 +-
gcc/testsuite/g++.dg/ext/mv18.C | 2 +-
gcc/testsuite/g++.dg/ext/mv19.C | 2 +-
gcc/testsuite/g++.dg/ext/mv20.C | 2 +-
gcc/testsuite/g++.dg/ext/mv21.C | 2 +-
gcc/testsuite/g++.dg/ext/mv22.C | 2 +-
gcc/testsuite/g++.dg/ext/mv23.C | 2 +-
gcc/testsuite/g++.dg/ext/mv26.C | 1 +
gcc/testsuite/g++.dg/ext/mv6.C | 2 +-
gcc/testsuite/g++.dg/ext/mvc1.C | 1 +
gcc/testsuite/gcc.target/i386/cet-notrack-icf-1.c | 2 +-
gcc/testsuite/gcc.target/i386/cet-notrack-icf-3.c | 2 +-
gcc/testsuite/gcc.target/i386/cet-property-2.c | 2 +-
gcc/testsuite/gcc.target/i386/mvc1.c | 1 +
gcc/testsuite/gcc.target/i386/mvc10.c | 1 +
gcc/testsuite/gcc.target/i386/mvc11.c | 2 +-
gcc/testsuite/gcc.target/i386/mvc6.c | 2 +-
gcc/testsuite/gcc.target/i386/mvc7.c | 1 +
gcc/testsuite/gcc.target/i386/mvc8.c | 2 +-
gcc/testsuite/gcc.target/i386/mvc9.c | 2 +-
gcc/testsuite/gcc.target/i386/pr81213.c | 1 +
gcc/testsuite/gcc.target/i386/pr81214.c | 1 +
gcc/testsuite/gcc.target/i386/pr85403.c | 10 ++++++++++
gcc/testsuite/gcc.target/i386/sse-26.c | 2 +-
29 files changed, 39 insertions(+), 20 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/i386/pr85403.c
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 6fa5b0add02..8a73fc0d316 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -32344,6 +32344,8 @@ get_builtin_code_for_version (tree decl, tree
*predicate_list)
&global_options_set);
gcc_assert (target_node);
+ if (target_node == error_mark_node)
+ return 0;
new_target = TREE_TARGET_OPTION (target_node);
gcc_assert (new_target);
diff --git a/gcc/testsuite/gcc.target/i386/pr85403.c
b/gcc/testsuite/gcc.target/i386/pr85403.c
new file mode 100644
index 00000000000..f4fb12dd4e2
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr85403.c
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-fcf-protection -mcet" } */
+/* { dg-require-ifunc "" } */
+
+__attribute__((target_clones("avx","arch=slm","arch=core-avx2","default")))
+int
+foo ()
+{
+ return -2;
+} /* { dg-error "requires Intel CET support" } */
Added:
trunk/gcc/testsuite/gcc.target/i386/pr85403.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-601678-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 11:39:45 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
Date: Mon, 16 Apr 2018 11:39:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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>From gcc-bugs-return-601679-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 11:42:10 2018
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From: "martin@mpa-garching.mpg.de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/85416] New: Massive performance regression when switching on "-march=native"
Date: Mon, 16 Apr 2018 11:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85416
Bug ID: 85416
Summary: Massive performance regression when switching on
"-march=native"
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: martin@mpa-garching.mpg.de
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Created attachment 43945
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43945&action=edit
Test case
When compiling the attached test case with
g++ -O3 -std=c++14 testcase.cc
and measuring the runtime via
time ./a.out
I get a CPU time of roughly 1.3 seconds
Recompiling with
g++ -O3 -std=c++14 -march=native testcase.cc
increases run time to over 8 seconds.
CPU: Intel Core i5-5300U
This was measured on trunk (gcc version 8.0.1 20180411), but I see similar
performance degradations already in gcc 5.4.
>From gcc-bugs-return-601680-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 11:43:29 2018
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Subject: [Bug lto/85405] [6/7 Regression] ICE in odr_types_equivalent_p, at ipa-devirt.c:1581
Date: Mon, 16 Apr 2018 11:43:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
I've got patch for that.
>From gcc-bugs-return-601681-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 12:15:54 2018
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Subject: [Bug middle-end/85403] internal compiler error: ... config/i386/i386.c:32347
Date: Mon, 16 Apr 2018 12:15:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
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--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed.
>From gcc-bugs-return-601682-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 12:25:32 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 target/85414] [8 Regression] ICE: in ix86_expand_prologue, at config/i386/i386.c:13810 with -Og -fgcse
Date: Mon, 16 Apr 2018 12:25:00 -0000
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The problem is likely with the caching of ix86_compute_frame_layout results, at
least if I call this function at the beginning of ix86_expand_prologue, it
doesn't ICE anymore.
What changes in particular is ix86_nsaved_regs () on this testcase, during lra
-> lra_eliminate -> update_reg_eliminate it still returns 1, but during
pro_and_epilogue already 2.
The difference is in register 41.
What happens is:
1) fwprop1 adds a REG_EQUAL to the umulditi3_1 instruction:
(insn 13 12 111 3 (parallel [
(set (reg:TI 99)
(mult:TI (zero_extend:TI (subreg/s/v:DI (reg:TI 94) 0))
(zero_extend:TI (reg:DI 100))))
(clobber (reg:CC 17 flags))
]) "pr85414.c":5 366 {*umulditi3_1}
(expr_list:REG_EQUAL (mult:TI (zero_extend:TI (subreg/s/v:DI (reg:TI 94)
0))
(const_int 59 [0x3b]))
(expr_list:REG_DEAD (reg:DI 100)
(expr_list:REG_DEAD (reg:TI 94)
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil))))))
2) then probably based on the /s/v flags on the subreg that indicate
SUBREG_PROMOTED_VAR_P and SUBREG_PROMOTED_UNSIGNED_P, the cse_local pass
"optimizes" the REG_EQUAL note to (mult:TI (subreg:TI (subreg/s/v:DI (reg:TI
94) 0) 0) (const_int 59 [0x3b]))
That actually looks to me like invalid RTL, subreg of a subreg is not valid.
I guess it should have been just (mult:TI (reg:TI 94) (const_int 59 [0x3b])).
3) then the subreg2 pass just replaces uses of (reg:TI 94) subregs with (reg:DI
146)
4) during LRA we have (mult:TI (subreg:TI (reg:DI 40 r11 [146]) 0) (const_int
59 [0x3b])) and that refers to the r12 too, but nothing earlier recognized it
as used (nor it is actually used in the insn).
>From gcc-bugs-return-601683-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 12:37:18 2018
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Subject: [Bug testsuite/85417] New: Extra test failures with -fcf-protection -mcet
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When
RUNTESTFLAGS="--target_board='unix{-fcf-protection\ -mcet}'"
is used with "make check", there are extra test failures like:
FAIL: gcc.target/i386/mvc1.c (test for excess errors)
[hjl@gnu-4 gcc]$ /export/build/gnu/gcc-test/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc-test/build-x86_64-linux/gcc/
/export/gnu/import/git/sources/gcc/gcc/testsuite/gcc.target/i386/mvc1.c
-fcf-protection -mcet -fno-diagnostics-show-caret -fdiagnostics-color=never
-ansi -pedantic-errors -lm -o ./mvc1.exe
/export/gnu/import/git/sources/gcc/gcc/testsuite/gcc.target/i386/mvc1.c: In
function \u2018foo.resolver\u2019:
/export/gnu/import/git/sources/gcc/gcc/testsuite/gcc.target/i386/mvc1.c:27:1:
error: \u2018-fcf-protection=full\u2019 requires Intel CET support. Use -mcet
or both of -mibt and -mshstk options to enable CET
[hjl@gnu-4 gcc]$
Since CET is applied to the whole program, we can't disable CET in
one function.
>From gcc-bugs-return-601684-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 12:46:02 2018
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Subject: [Bug demangler/85304] Segmentation fault
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--- Comment #1 from Michael Matz <matz at gcc dot gnu.org> ---
Similar to https://sourceware.org/bugzilla/show_bug.cgi?id=23008,
the testcase contains a mangled name with roughly 29000 successive 'E'
characters. Processing one 'E' character involves calling these three
routines:
5 0x00000000004e8901 in demangle_expression (work=0x7fffffffd810,
mangled=0x7fffffffd710,
s=0x7fffffffd540, tk=tk_integral) at ../../libiberty/cplus-dem.c:1895
1895 success = demangle_template_value_parm (work, mangled, s, tk);
(gdb)
#4 0x00000000004e98cb in demangle_template_value_parm (work=0x7fffffffd810,
mangled=0x7fffffffd710,
s=0x7fffffffd540, tk=tk_integral) at ../../libiberty/cplus-dem.c:2069
2069 success = demangle_integral_value (work, mangled, s);
(gdb)
#3 0x00000000004e8b82 in demangle_integral_value (work=0x7fffffffd810,
mangled=0x7fffffffd710,
s=0x7fffffffd540) at ../../libiberty/cplus-dem.c:1916
1916 success = demangle_expression (work, mangled, s, tk_integral);
That advances *mangled by one character and uses 496 bytes of stack while
doing that (when compiled by gcc-6 with address sanitizer). The linux default
stack of 8 MB is good for 16893 of the E characters until stack overflow
occurs.
Without sanitizer we need less stack per recursion level, so that the testcase
doesn't cause a proplem (but just increasing the number of 'E' will make
it segfault there as well).
It seems all is working as designed, you request it to demangle a recursive
structure of > 20000 levels deep and get what can be expected from that, a
stack
overflow.
>From gcc-bugs-return-601685-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 12:49:49 2018
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Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85416
--- Comment #1 from Martin Reinecke <martin@mpa-garching.mpg.de> ---
Just re-tested on an Intel Core i5-4570; on this CPU, there is no performance
degradation.
>From gcc-bugs-return-601686-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 13:31:00 2018
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Subject: [Bug c++/84463] [6/7/8 Regression] Supposedly-incompliant "error: '* key0' is not a constant expression"
Date: Mon, 16 Apr 2018 13:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84463
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-16
Known to work| |5.5.0
Summary|Supposedly-incompliant |[6/7/8 Regression]
|"error: '* key0' is not a |Supposedly-incompliant
|constant expression" |"error: '* key0' is not a
| |constant expression"
Ever confirmed|0 |1
Known to fail| |6.4.0, 7.3.0, 8.0.1
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Started to fail with r230365 ("Merge C++ delayed folding branch.")
>From gcc-bugs-return-601687-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 13:39:51 2018
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Subject: [Bug middle-end/85414] [8 Regression] ICE: in ix86_expand_prologue, at config/i386/i386.c:13810 with -Og -fgcse
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85414
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43946
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43946&action=edit
gcc8-pr85414.patch
Untested fix. We really should never generate subreg of subreg, period.
>From gcc-bugs-return-601688-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 13:49:40 2018
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Subject: [Bug rtl-optimization/84842] 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 #7 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
The testcase is not easily reproducible because the rs6000 backend has some
implicit dependencies on capabilities of configure-time binutils, and they are
not visible as 'gcc -v' flags.
So, to reproduce this we need to know the version and configure flags of cross
binutils that were found and checked by gcc's configure.
>From gcc-bugs-return-601689-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 14:04:52 2018
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Subject: [Bug rtl-optimization/84842] 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 #8 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Or as Jakub (thanks!) noted on IRC, gcc/auto-host.h from the build tree may be
also helpful and simpler for us to work with.
>From gcc-bugs-return-601690-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 14:06:05 2018
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
Date: Mon, 16 Apr 2018 14:06:00 -0000
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--- Comment #14 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Created attachment 43947
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43947&action=edit
Proposed fix
We looked into this with Maritn todday. There are two bugs: one is the fact
that lto.c forgets to register the type in case it was within strongly
connected component after its outer type. The order depends on hash values and
is not well determined. We do not want to test TYPE_CANONICAL being non-NULL.
Martin is testing it.
Other is the fact that Eric's last change make odr types compatible when one of
them is incomplete. This is not necessarily the case. The patch should fix the
ordering issue by going the slow path in case type already in hashtable is
incomplete. In this case it won't take long to compare it with the other type
anyway.
>From gcc-bugs-return-601691-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 14:35:25 2018
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Subject: [Bug target/85417] Extra test failures with -fcf-protection -mcet
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-16
CC| |igor.v.tsimbalist at intel dot com
Component|testsuite |target
Ever confirmed|0 |1
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Since CET is compatible with all processors with multi-byte NOPs, which
covers all 64-bit processors as well as 32-bit processors starting with
Pentium Pro, fcf-protection should be allowed on these processors.
>From gcc-bugs-return-601692-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 14:50:45 2018
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Subject: [Bug target/83660] ICE with vec_extract inside expression statement
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--- Comment #14 from acsawdey at gcc dot gnu.org ---
Author: acsawdey
Date: Mon Apr 16 14:50:06 2018
New Revision: 259403
URL: https://gcc.gnu.org/viewcvs?rev=259403&root=gcc&view=rev
Log:
2018-04-16 Aaron Sawdey <acsawdey@linux.ibm.com>
PR target/83660
* config/rs6000/rs6000-c.c (altivec_resolve_overloaded_builtin): Mark
vec_extract expression as having side effects to make sure it gets
a cleanup point.
2018-04-16 Aaron Sawdey <acsawdey@linux.ibm.com>
PR target/83660
* gcc.target/powerpc/pr83660.C: New test.
Added:
trunk/gcc/testsuite/gcc.target/powerpc/pr83660.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/rs6000-c.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/83660] ICE with vec_extract inside expression statement
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acsawdey at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #15 from acsawdey at gcc dot gnu.org ---
Fixed in 259403.
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Subject: [Bug c/85418] New: -Wformat-truncation on inlinned function
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85418
Bug ID: 85418
Summary: -Wformat-truncation on inlinned function
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: Azim.Khan at arm dot com
Target Milestone: ---
See following code:
```
#include <stdio.h>
void f(const char s[5], size_t len)
{
char b[5];
snprintf(b, len, "%s", s);
}
int main()
{
f("Hello World", 4);
return 0;
}
```
On compiling it with -O2/3 f() gets inlinned and snprintf format checks apply
to it even though parameters to snprintf are parameters within f().
>From gcc-bugs-return-601695-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 15:06:18 2018
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Subject: [Bug c++/84463] [6/7/8 Regression] Supposedly-incompliant "error: '* key0' is not a constant expression"
Date: Mon, 16 Apr 2018 15:06:00 -0000
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----------------------------------------------------------------------------
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43948
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43948&action=edit
gcc8-pr84463.patch
Untested fix.
>From gcc-bugs-return-601696-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 15:10:43 2018
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From: "terra at gnome dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/85419] New: Incorrect determination of null pointer constant
Date: Mon, 16 Apr 2018 15:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85419
Bug ID: 85419
Summary: Incorrect determination of null pointer constant
Product: gcc
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Created attachment 43949
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Preprocessed source code
Priority: low
#include <stdio.h>
int
main (int argc,char **argv)
{
printf ("%p\n", 0 ? (void *restrict)0 : (int *)0);
return 0;
}
As I read C99's section 6.3.2.3, (void *restrict)0 is *not* a null pointer
constant.
I am reading section 6.5.15 as saying the ?: is valid with type
void *restrict.
%p is valid for such a pointer.
gcc disagrees:
# gcc -std=c99 -pedantic -Wall t.c
t.c: In function ‘main’:
t.c:6:3: warning: format ‘%p’ expects argument of type ‘void *’, but argument 2
has type ‘int *’ [-Wformat=]
printf ("%p\n", 0 ? (void *restrict)0 : (int *)0);
^
I.e., it thinks (void *restrict)0 is a null pointer constant. Hence ?:
becomes an int* and %p isn't valid for that in a pedantic sense.
Removing the "restrict" clearly makes the program invalid in a pedantic
sense. I.e., Section 6.7.3 #7 is wrong.
Details: stock OpenSuSE 42.3
>From gcc-bugs-return-601697-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 15:13:56 2018
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Subject: [Bug middle-end/85420] New: More -Wrestrict false positives with -fsanitize=undefined
Date: Mon, 16 Apr 2018 15:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85420
Bug ID: 85420
Summary: More -Wrestrict false positives with
-fsanitize=undefined
Product: gcc
Version: 8.0.1
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Created attachment 43950
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43950&action=edit
C testcase
The attached testcases produce extra warnings of the "may overlap" kind with
-Wrestrict -fsanitize=undefined (PR85365 covers the "same destination" kind).
# gcc-8 -c -O2 -fsanitize=undefined -Wrestrict t5.c
t5.c: In function 'c':
t5.c:6:5: warning: 'strcpy' accessing 1 byte at offsets 0 and [0, 1] may
overlap 1 byte at offset 0 [-Wrestrict]
strcpy(b, b + a);
^~~~~~~~~~~~~~~~
g++-8 -c -O2 -fsanitize=undefined -Wrestrict t6.cpp
t6.cpp: In member function 'int c::m_fn1()':
t6.cpp:13:9: warning: 'char* strcat(char*, const char*)' accessing 4096 or more
bytes at offsets 0 and 4095 may overlap 1 byte at offset 4095 [-Wrestrict]
strcat(e, d.b);
~~~~~~^~~~~~~~
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Subject: [Bug middle-end/85420] More -Wrestrict false positives with -fsanitize=undefined
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--- Comment #1 from Franz Sirl <sirl at gcc dot gnu.org> ---
Created attachment 43951
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C++ testcase
>From gcc-bugs-return-601699-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 15:26:24 2018
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Subject: [Bug c++/84463] [6/7/8 Regression] Supposedly-incompliant "error: '* key0' is not a constant expression"
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Priority|P3 |P2
Target Milestone|--- |6.5
>From gcc-bugs-return-601700-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 15:38:28 2018
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Subject: [Bug middle-end/85420] More -Wrestrict false positives with -fsanitize=undefined
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The #c0 testcase is always UB if the function is called, why doesn't it deserve
a warning? Either a is initially 0, then already the first iteration invokes
UB (strcpy (b, b)) and -Wrestrict is right, or a is 1 and strcpy (b, b + 1)
invokes UB because it dereferences b[1] in the first iteration, or a is
different and and b + a invokes UB.
>From gcc-bugs-return-601701-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 15:39:22 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85421] New: [8 regression] internal compiler error: in ipa_propagate_frequency, at ipa-profile.c:405
Date: Mon, 16 Apr 2018 15:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85421
Bug ID: 85421
Summary: [8 regression] internal compiler error: in
ipa_propagate_frequency, at ipa-profile.c:405
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
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Created attachment 43952
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Preprocessed reproducer file.
This issue found while compiling HHVM sources. GCC 8 regressed with ICE between
04/10/2018 and 04/11/2018
ICE with 04/11/2018 compiler
$g++ --version
g++ (GCC) 8.0.1 20180411 (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.
$g++ -std=gnu++1y -O3 -o QCRAMCodec.cpp.o -c QCRAMCodec.cpp.i -w
during IPA pass: cp
QCRAMCodec.cpp.i:128:1: internal compiler error: in ipa_propagate_frequency, at
ipa-profile.c:405
} // namespace bk
^
0x6ce400 ipa_propagate_frequency(cgraph_node*)
../../gcc-main.3V7F/gcc/ipa-profile.c:405
0xce6ca3 symbol_table::remove_unreachable_nodes(_IO_FILE*)
../../gcc-main.3V7F/gcc/ipa.c:701
0xdc7f09 execute_todo
../../gcc-main.3V7F/gcc/passes.c:2062
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.
Work fine with 04/10/2018 compiler.
$g++ --version
g++ (GCC) 8.0.1 20180410 (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.
$g++ -std=gnu++1y -O3 -o QCRAMCodec.cpp.o -c QCRAMCodec.cpp.i -w
$ echo $?
0
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Subject: [Bug rtl-optimization/84842] [7/8 Regression] ICE in verify_target_availability, at sel-sched.c:1569
Date: Mon, 16 Apr 2018 15:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84842
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
CC| |jakub at gcc dot gnu.org
Target Milestone|--- |7.4
Summary|ICE in |[7/8 Regression] ICE in
|verify_target_availability, |verify_target_availability,
|at sel-sched.c:1569 |at sel-sched.c:1569
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r241631 (at least the #c3 testcase). You need -m32 which isn't
entirely obvious from it, and -mcpu=power8 is essential, so either you need gas
with that support around, or e.g. hand-edit auto-host.h to make sure
HAVE_AS_CMPB, HAVE_AS_DFP, HAVE_AS_FPRND, HAVE_AS_POPCNTD, HAVE_AS_POWER8
are defined to 1, then make -j16 cc1.
>From gcc-bugs-return-601703-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 15:46:04 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 lto/85422] New: [openacc] ICE at cfgloop.c:468: segfault in flow_loops_find
Date: Mon, 16 Apr 2018 15:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85422
Bug ID: 85422
Summary: [openacc] ICE at cfgloop.c:468: segfault in
flow_loops_find
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
CC: marxin at gcc dot gnu.org
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When compiling this program:
...
int
main (void)
{
#pragma acc parallel
#pragma acc loop
for (int i = 1; i < 10; i++)
for (;;)
;
return 0;
}
...
we run into this ICE:
...
to1: internal compiler error: Segmentation fault
0xac51ff crash_signal
gcc/toplev.c:325
0x62cc08 flow_loops_find(loops*)
gcc/cfgloop.c:468
0x961b3b input_cfg
gcc/lto-streamer-in.c:841
0x961b3b input_function
gcc/lto-streamer-in.c:1069
0x961b3b lto_read_body_or_constructor
gcc/lto-streamer-in.c:1287
0x961b3b lto_input_variable_constructor(lto_file_decl_data*, varpool_node*,
char const*)
gcc/lto-streamer-in.c:1345
0x651d4e cgraph_node::get_untransformed_body()
gcc/cgraph.c:3667
0x6604d2 cgraph_node::expand()
gcc/cgraphunit.c:2109
0x661df2 output_in_order
gcc/cgraphunit.c:2381
0x661df2 symbol_table::compile()
gcc/cgraphunit.c:2623
0x5adccc lto_main()
gcc/lto/lto.c:3382
...
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Subject: [Bug middle-end/84955] [7/8 Regression] Incorrect OpenACC tile expansion
Date: Mon, 16 Apr 2018 15:49:00 -0000
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--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to cesar from comment #6)
> It should be noted that GCC also chokes with any empty OpenACC loop in
> general.
Filed as PR85422 - [openacc] ICE at cfgloop.c:468: segfault in flow_loops_find
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Subject: [Bug lto/85422] [openacc] ICE at cfgloop.c:468: segfault in flow_loops_find
Date: Mon, 16 Apr 2018 15:49:00 -0000
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |openacc
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Tentative patch was submitted here (
https://gcc.gnu.org/ml/gcc-patches/2018-04/msg00316.html ) and committed, but
reverted again.
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Subject: [Bug target/83660] ICE with vec_extract inside expression statement
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acsawdey at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
--- Comment #16 from acsawdey at gcc dot gnu.org ---
Possibly need backports to both 7 and 6.
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Subject: [Bug middle-end/85420] More -Wrestrict false positives with -fsanitize=undefined
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--- Comment #3 from Franz Sirl <sirl at gcc dot gnu.org> ---
Hmm, this maybe creduce'd too much, the original source reads more like
strcpy(b, b + a + 10);
which would be only UB for sure if strlen(b + a + 10) >= 9, or?
>From gcc-bugs-return-601708-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 16:13:09 2018
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Subject: [Bug middle-end/85420] More -Wrestrict false positives with -fsanitize=undefined
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Franz Sirl from comment #3)
> Hmm, this maybe creduce'd too much, the original source reads more like
>
> strcpy(b, b + a + 10);
>
> which would be only UB for sure if strlen(b + a + 10) >= 9, or?
If b was actually a larger array, then yes, otherwise even b + 10 would be UB.
>From gcc-bugs-return-601709-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 16:21:10 2018
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85417] -fcf-protection should provide CET protection on x86
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.0
Summary|Extra test failures with |-fcf-protection should
|-fcf-protection -mcet |provide CET protection on
| |x86
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
I am working to enable CET on Linux with a single binary. -fcf-protection
should provide CET protection on x86 by default. We can add a command-line
option if we want a different implementation.
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Subject: [Bug web/82686] Debian sid powerpc64-unknown-linux-gnu 4.13.0-1-powerpc64 bootstrap breaks in stage3 with unexpected requirement for bdw-gc
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82686
--- Comment #13 from Dennis Clarke <dclarke at blastwave dot org> ---
Finally managed to get a decent looking three stage bootstrap to complete
without bizarre errors. Thanks to Matthias Klose for the suggestion to
get away from that gc issue entirely.
Testsuite is running however I am not thrilled with what I see :
=== gcc Summary ===
# of expected passes 112961
# of unexpected failures 910
# of unexpected successes 22
# of expected failures 347
# of unresolved testcases 1
# of unsupported tests 2794
/usr/local/build/gcc-7.3.0_linux_4.15.0-2-powerpc64_ppc64.005/gcc/xgcc version
7.3.0 (genunix Mon Apr 16 00:04:56 GMT 2018)
I'll followup with the libquadmath issues that may yet exist. Not sure yet.
Dennis
>From gcc-bugs-return-601711-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 16:56:39 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85421] [8 regression] internal compiler error: in ipa_propagate_frequency, at ipa-profile.c:405
Date: Mon, 16 Apr 2018 16:56:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-16
CC| |mjambor at suse dot cz
Target Milestone|--- |8.0
Ever confirmed|0 |1
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
It is caused by r259319.
>From gcc-bugs-return-601712-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 17:17:56 2018
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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/85423] New: [8 Regression] ICE in code_motion_process_successors, at sel-sched.c:6403
Date: Mon, 16 Apr 2018 17:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85423
Bug ID: 85423
Summary: [8 Regression] ICE in code_motion_process_successors,
at sel-sched.c:6403
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
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Target: x86_64-pc-linux-gnu
gcc-8.0.0-alpha20180415 snapshot (r259389) ICEs when compiling the following
snippet w/ -march=nano -O2 (-O3, -Ofast) -fselective-scheduling2
-fvar-tracking-assignments -fno-guess-branch-probability -fno-peephole2
-fno-ssa-phiopt -fno-tree-pre --param max-jump-thread-duplication-stmts=8:
int vn, xm;
void
i1 (int);
void
mb (int *ap, int ev)
{
while (vn < 1)
{
i1 (vn);
ev += *ap && ++vn;
while (xm < 1)
++xm;
if (*ap == 0)
*ap = ev;
++vn;
}
}
% x86_64-unknown-linux-gnu-gcc-8.0.0-alpha20180415 -march=nano -O2
-fselective-scheduling2 -fvar-tracking-assignments
-fno-guess-branch-probability -fno-peephole2 -fno-ssa-phiopt -fno-tree-pre
--param max-jump-thread-duplication-stmts=8 -w -c l7diilgr.c
during RTL pass: sched2
l7diilgr.c: In function 'mb':
l7diilgr.c:23:1: internal compiler error: in code_motion_process_successors, at
sel-sched.c:6403
}
^
0xc6c314 code_motion_process_successors
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6400
0xc6c314 code_motion_path_driver
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6622
0xc6be6e code_motion_process_successors
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6356
0xc6be6e code_motion_path_driver
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6622
0xc6be6e code_motion_process_successors
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6356
0xc6be6e code_motion_path_driver
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6622
0xc6c512 move_op
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:6714
0xc6c512 move_exprs_to_boundary
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:5237
0xc6c512 schedule_expr_on_boundary
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:5450
0xc705ac fill_insns
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:5592
0xc705ac schedule_on_fences
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7366
0xc705ac sel_sched_region_2
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7504
0xc71d28 sel_sched_region_1
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7546
0xc725ae sel_sched_region(int)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7647
0xc734c1 run_selective_scheduling()
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sel-sched.c:7733
0xc52d45 rest_of_handle_sched2
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sched-rgn.c:3732
0xc52d45 execute
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/sched-rgn.c:3876
>From gcc-bugs-return-601713-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 17:29:13 2018
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Subject: [Bug tree-optimization/85420] missing -Wrestrict with -fsanitize=undefined
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-16
CC| |msebor at gcc dot gnu.org
Component|middle-end |tree-optimization
Summary|More -Wrestrict false |missing -Wrestrict with
|positives with |-fsanitize=undefined
|-fsanitize=undefined |
Ever confirmed|0 |1
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
The warning for attachment 43950 is intended and the bug is actually in failing
to issue it without -fsanitize=undefined. Unlike for raw memory functions such
as memcpy, for string functions like strcpy -Wrestrict triggers even for
possible overlaps. I.e., copying a substring of the same array is designed to
warn whether or not the overlap is certain, as in:
char a[32];
void f (int i)
{
__builtin_strcpy (a, a + i); // -Wrestrict expected here
}
This doesn't work completely consistently -- e.g., the above won't warn if a is
changed to a pointer -- but the basic idea is that strcpy is too
"unpredictable" to be safely used to copy substrings within the same array. So
confirming for the missing warning.
The warning in attachment 43951 looks like a different bug in -Wrestrict: it
doesn't consider the sizes of the two array members and so it doesn't
distinguish between them. Let me open a separate report for this.
>From gcc-bugs-return-601714-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 17:36:51 2018
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Subject: [Bug tree-optimization/85420] missing -Wrestrict with -fsanitize=undefined
Date: Mon, 16 Apr 2018 17:36:00 -0000
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #5)
> The warning for attachment 43950 [details] is intended and the bug is
> actually in failing to issue it without -fsanitize=undefined. Unlike for
> raw memory functions such as memcpy, for string functions like strcpy
> -Wrestrict triggers even for possible overlaps.
That is a bad decision. The overlap is something much better caught at
runtime, where it can be accurately, and not just throw mostly false positive
warnings at user when there is nothing wrong with the code and hardly anything
that can be done to avoid the false positive warnings.
-fsanitize=address can diagnose strcpy etc. overlap just fine.
>From gcc-bugs-return-601715-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 17:40:11 2018
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Subject: [Bug c++/85421] [8 regression] internal compiler error: in ipa_propagate_frequency, at ipa-profile.c:405
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Martin Jambor <jamborm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jamborm at gcc dot gnu.org
--- Comment #2 from Martin Jambor <jamborm at gcc dot gnu.org> ---
will have a look the first thing tomorrow.
>From gcc-bugs-return-601716-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 17:51:57 2018
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Subject: [Bug rtl-optimization/85423] [8 Regression] ICE in code_motion_process_successors, at sel-sched.c:6403
Date: Mon, 16 Apr 2018 17:51:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-16
CC| |abel at gcc dot gnu.org,
| |amonakov at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
Target Milestone|--- |8.0
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r259231.
>From gcc-bugs-return-601717-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 17:53:27 2018
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--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
Whether that's a good or bad decision is a matter of opinion. Most coding
guidelines advise against using strcpy even between distinct objects. I happen
to think that's unnecessarily restrictive when the size of the destination is
known to be large enough for the source string, but I do feel it's unsafe to
use strcpy to copy substrings within the same array and that using memcpy is
preferable. (The strengths and weaknesses of warnings and sanitizers are well
known and don't need to be debated here.)
>From gcc-bugs-return-601718-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 18:01:51 2018
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Subject: [Bug middle-end/84955] [7/8 Regression] Incorrect OpenACC tile expansion
Date: Mon, 16 Apr 2018 18:01:00 -0000
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--- Comment #8 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Mon Apr 16 18:01:09 2018
New Revision: 259406
URL: https://gcc.gnu.org/viewcvs?rev=259406&root=gcc&view=rev
Log:
[openacc] Fix ICE when compiling tile loop containing infinite loop
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:
trunk/libgomp/testsuite/libgomp.oacc-c-c++-common/pr84955.c
trunk/libgomp/testsuite/libgomp.oacc-fortran/pr84955.f90
Modified:
trunk/gcc/ChangeLog
trunk/gcc/omp-expand.c
trunk/libgomp/ChangeLog
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Subject: [Bug target/85080] [8 regression] gcc.dg/vect/costmodel/ppc/costmodel-pr37194.c fails starting with r248678
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--- Comment #5 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Author: wschmidt
Date: Mon Apr 16 18:18:42 2018
New Revision: 259407
URL: https://gcc.gnu.org/viewcvs?rev=259407&root=gcc&view=rev
Log:
[gcc/testsuite]
2018-04-16 Bill Schmidt <wschmidt@linux.ibm.com>
PR target/85080
* gcc.dg/vect/costmodel/ppc/costmodel-pr37194.c: Skip dump checks
if the target supports efficient unaligned storage accesses.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-pr37194.c
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Subject: [Bug target/85080] [8 regression] gcc.dg/vect/costmodel/ppc/costmodel-pr37194.c fails starting with r248678
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
Date: Mon, 16 Apr 2018 18:38:00 -0000
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--- Comment #15 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> We looked into this with Martin todday. There are two bugs: one is the fact
> that lto.c forgets to register the type in case it was within strongly
> connected component after its outer type. The order depends on hash values
> and is not well determined. We do not want to test TYPE_CANONICAL being
> non-NULL. Martin is testing it.
OK, thanks for sorting this out. It helps when specialists kick in. ;-)
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Subject: [Bug target/82499] x86: small stack initial adjustments could use push
Date: Mon, 16 Apr 2018 18:43:00 -0000
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--- Comment #6 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Mon Apr 16 18:42:57 2018
New Revision: 259408
URL: https://gcc.gnu.org/viewcvs?rev=259408&root=gcc&view=rev
Log:
i386: Move struct ix86_frame to machine_function
Make ix86_frame available to i386 code generation. This is needed to
backport the patch set of -mindirect-branch= to mitigate variant #2 of
the speculative execution vulnerabilities on x86 processors identified
by CVE-2017-5715, aka Spectre.
Backport from mainline
2017-10-13 H.J. Lu <hongjiu.lu@intel.com>
PR target/82499
* config/i386/i386.h (ix86_red_zone_size): New.
2017-06-01 Bernd Edlinger <bernd.edlinger@hotmail.de>
* config/i386/i386.c (ix86_frame): Moved to ...
* config/i386/i386.h (ix86_frame): Here.
(machine_function): Add frame.
* config/i386/i386.c (ix86_compute_frame_layout): Repace the
frame argument with &cfun->machine->frame.
(ix86_can_use_return_insn_p): Don't pass &frame to
ix86_compute_frame_layout. Copy frame from cfun->machine->frame.
(ix86_can_eliminate): Likewise.
(ix86_expand_prologue): Likewise.
(ix86_expand_epilogue): Likewise.
(ix86_expand_split_stack_prologue): Likewise.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/config/i386/i386.c
branches/gcc-6-branch/gcc/config/i386/i386.h
>From gcc-bugs-return-601723-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 18:45:47 2018
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Subject: [Bug target/83905] ix86_expand_epilogue modifies the copy of cfun->machine->frame
Date: Mon, 16 Apr 2018 18:45:00 -0000
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--- Comment #5 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Mon Apr 16 18:44:43 2018
New Revision: 259411
URL: https://gcc.gnu.org/viewcvs?rev=259411&root=gcc&view=rev
Log:
i386: Use const reference of struct ix86_frame to avoid copy
We can use const reference of struct ix86_frame to avoid making a local
copy of ix86_frame. ix86_expand_epilogue makes a local copy of struct
ix86_frame and uses the reg_save_offset field as a local variable. This
patch uses a separate local variable for reg_save_offset.
Tested on x86-64 with ada.
Backport from mainline
PR target/83905
* config/i386/i386.c (ix86_expand_prologue): Use cost reference
of struct ix86_frame.
(ix86_expand_epilogue): Likewise. Add a local variable for
the reg_save_offset field in struct ix86_frame.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug web/82686] Debian sid powerpc64-unknown-linux-gnu 4.13.0-1-powerpc64 bootstrap breaks in stage3 with unexpected requirement for bdw-gc
Date: Mon, 16 Apr 2018 18:48:00 -0000
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--- Comment #14 from Dennis Clarke <dclarke at blastwave dot org> ---
Since this bug was a "bootstrap" issue I think I should close it
as simply an issue related to the garbage collector libs needed.
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Subject: [Bug bootstrap/83839] [8 Regression] bootstrap fails in gcc/config/i386/i386.c on darwin
Date: Mon, 16 Apr 2018 18:55:00 -0000
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--- Comment #10 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Mon Apr 16 18:55:04 2018
New Revision: 259414
URL: https://gcc.gnu.org/viewcvs?rev=259414&root=gcc&view=rev
Log:
x86: Add -mfunction-return=
Add -mfunction-return= option to convert function return to call and
return thunks. The default is 'keep', which keeps function return
unmodified. 'thunk' converts function return to call and return thunk.
'thunk-inline' converts function return to inlined call and return thunk.
'thunk-extern' converts function return to external call and return
thunk provided in a separate object file. You can control this behavior
for a specific function by using the function attribute function_return.
Function return thunk is the same as memory thunk for -mindirect-branch=
where the return address is at the top of the stack:
__x86_return_thunk:
call L2
L1:
pause
lfence
jmp L1
L2:
lea 8(%rsp), %rsp|lea 4(%esp), %esp
ret
and function return becomes
jmp __x86_return_thunk
-mindirect-branch= tests are updated with -mfunction-return=keep to
avoid false test failures when -mfunction-return=thunk is added to
RUNTESTFLAGS for "make check".
gcc/
Backport from mainline
2018-01-14 H.J. Lu <hongjiu.lu@intel.com>
* config/i386/i386-protos.h (ix86_output_function_return): New.
* config/i386/i386.c (ix86_set_indirect_branch_type): Also
set function_return_type.
(indirect_thunk_name): Add ret_p to indicate thunk for function
return.
(output_indirect_thunk_function): Pass false to
indirect_thunk_name.
(ix86_output_indirect_branch_via_reg): Likewise.
(ix86_output_indirect_branch_via_push): Likewise.
(output_indirect_thunk_function): Create alias for function
return thunk if regno < 0.
(ix86_output_function_return): New function.
(ix86_handle_fndecl_attribute): Handle function_return.
(ix86_attribute_table): Add function_return.
* config/i386/i386.h (machine_function): Add
function_return_type.
* config/i386/i386.md (simple_return_internal): Use
ix86_output_function_return.
(simple_return_internal_long): Likewise.
* config/i386/i386.opt (mfunction-return=): New option.
(indirect_branch): Mention -mfunction-return=.
* doc/extend.texi: Document function_return function attribute.
* doc/invoke.texi: Document -mfunction-return= option.
gcc/testsuite/
Backport from mainline
2018-01-14 H.J. Lu <hongjiu.lu@intel.com>
* gcc.target/i386/indirect-thunk-1.c (dg-options): Add
-mfunction-return=keep.
* gcc.target/i386/indirect-thunk-2.c: Likewise.
* gcc.target/i386/indirect-thunk-3.c: Likewise.
* gcc.target/i386/indirect-thunk-4.c: Likewise.
* gcc.target/i386/indirect-thunk-5.c: Likewise.
* gcc.target/i386/indirect-thunk-6.c: Likewise.
* gcc.target/i386/indirect-thunk-7.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-1.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-2.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-3.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-4.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-5.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-6.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-7.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-8.c: Likewise.
* gcc.target/i386/indirect-thunk-bnd-1.c: Likewise.
* gcc.target/i386/indirect-thunk-bnd-2.c: Likewise.
* gcc.target/i386/indirect-thunk-bnd-3.c: Likewise.
* gcc.target/i386/indirect-thunk-bnd-4.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-1.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-2.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-3.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-4.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-5.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-6.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-7.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-1.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-2.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-3.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-4.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-5.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-6.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-7.c: Likewise.
* gcc.target/i386/ret-thunk-1.c: New test.
* gcc.target/i386/ret-thunk-10.c: Likewise.
* gcc.target/i386/ret-thunk-11.c: Likewise.
* gcc.target/i386/ret-thunk-12.c: Likewise.
* gcc.target/i386/ret-thunk-13.c: Likewise.
* gcc.target/i386/ret-thunk-14.c: Likewise.
* gcc.target/i386/ret-thunk-15.c: Likewise.
* gcc.target/i386/ret-thunk-16.c: Likewise.
* gcc.target/i386/ret-thunk-2.c: Likewise.
* gcc.target/i386/ret-thunk-3.c: Likewise.
* gcc.target/i386/ret-thunk-4.c: Likewise.
* gcc.target/i386/ret-thunk-5.c: Likewise.
* gcc.target/i386/ret-thunk-6.c: Likewise.
* gcc.target/i386/ret-thunk-7.c: Likewise.
* gcc.target/i386/ret-thunk-8.c: Likewise.
* gcc.target/i386/ret-thunk-9.c: Likewise.
i386: Don't use ASM_OUTPUT_DEF for TARGET_MACHO
ASM_OUTPUT_DEF isn't defined for TARGET_MACHO. Use ASM_OUTPUT_LABEL to
generate the __x86_return_thunk label, instead of the set directive.
Update testcase to remove the __x86_return_thunk label check. Since
-fno-pic is ignored on Darwin, update testcases to sscan or "push"
only on Linux.
gcc/
Backport from mainline
2018-01-15 H.J. Lu <hongjiu.lu@intel.com>
PR target/83839
* config/i386/i386.c (output_indirect_thunk_function): Use
ASM_OUTPUT_LABEL, instead of ASM_OUTPUT_DEF, for TARGET_MACHO
for __x86.return_thunk.
gcc/testsuite/
Backport from mainline
2018-01-15 H.J. Lu <hongjiu.lu@intel.com>
PR target/83839
* gcc.target/i386/indirect-thunk-1.c: Scan for "push" only on
Linux.
* gcc.target/i386/indirect-thunk-2.c: Likewise.
* gcc.target/i386/indirect-thunk-3.c: Likewise.
* gcc.target/i386/indirect-thunk-4.c: Likewise.
* gcc.target/i386/indirect-thunk-7.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-1.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-2.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-5.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-6.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-7.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-1.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-2.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-3.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-4.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-7.c: Likewise.
* gcc.target/i386/indirect-thunk-register-1.c: Likewise.
* gcc.target/i386/indirect-thunk-register-3.c: Likewise.
* gcc.target/i386/indirect-thunk-register-4.c: Likewise.
* gcc.target/i386/ret-thunk-10.c: Likewise.
* gcc.target/i386/ret-thunk-11.c: Likewise.
* gcc.target/i386/ret-thunk-12.c: Likewise.
* gcc.target/i386/ret-thunk-13.c: Likewise.
* gcc.target/i386/ret-thunk-14.c: Likewise.
* gcc.target/i386/ret-thunk-15.c: Likewise.
* gcc.target/i386/ret-thunk-9.c: Don't check the
__x86_return_thunk label.
Scan for "push" only for Linux.
Added:
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-1.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-10.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-11.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-12.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-13.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-14.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-15.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-16.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-3.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-4.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-5.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-6.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-7.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-8.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-9.c
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/config/i386/i386-protos.h
branches/gcc-6-branch/gcc/config/i386/i386.c
branches/gcc-6-branch/gcc/config/i386/i386.h
branches/gcc-6-branch/gcc/config/i386/i386.md
branches/gcc-6-branch/gcc/config/i386/i386.opt
branches/gcc-6-branch/gcc/doc/extend.texi
branches/gcc-6-branch/gcc/doc/invoke.texi
branches/gcc-6-branch/gcc/testsuite/ChangeLog
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-1.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-3.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-4.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-5.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-6.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-7.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-1.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-3.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-4.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-5.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-6.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-7.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-8.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-bnd-1.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-bnd-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-bnd-3.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-bnd-4.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-1.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-3.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-4.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-5.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-6.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-7.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-1.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-3.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-4.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-5.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-6.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-7.c
>From gcc-bugs-return-601726-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 19:04:39 2018
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From: "meissner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85424] New: The __builtin_packlongdouble function might have issues with the output overlapping the inputs
Date: Mon, 16 Apr 2018 19:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85424
Bug ID: 85424
Summary: The __builtin_packlongdouble function might have
issues with the output overlapping the inputs
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: meissner at gcc dot gnu.org
Target Milestone: ---
When I was working on PR target/85075, I noticed the big endian version of the
compiler would not build the 32-bit library that used the function to create an
explicit IBM extended double value.
The problem is the pattern:
(define_insn_and_split "pack<mode>"
[(set (match_operand:FMOVE128 0 "register_operand" "=d,&d")
(unspec:FMOVE128
[(match_operand:<FP128_64> 1 "register_operand" "0,d")
(match_operand:<FP128_64> 2 "register_operand" "d,d")]
UNSPEC_PACK_128BIT))]
"FLOAT128_2REG_P (<MODE>mode)"
"@
fmr %L0,%2
#"
"&& reload_completed && REGNO (operands[0]) != REGNO (operands[1])"
[(set (match_dup 3) (match_dup 1))
(set (match_dup 4) (match_dup 2))]
{
unsigned dest_hi = REGNO (operands[0]);
unsigned dest_lo = dest_hi + 1;
gcc_assert (!IN_RANGE (REGNO (operands[1]), dest_hi, dest_lo));
gcc_assert (!IN_RANGE (REGNO (operands[2]), dest_hi, dest_lo));
operands[3] = gen_rtx_REG (<FP128_64>mode, dest_hi);
operands[4] = gen_rtx_REG (<FP128_64>mode, dest_lo);
}
[(set_attr "type" "fpsimple,fp")
(set_attr "length" "4,8")])
Generated an insn not found message, when one of the input operands overlapped
the output. In the case I saw, operand1 was the same as the second output
register. It is better to just delete the support for the register overlapping
(and hence trying to save a move), then to see this pop again in somewhat rare
circumstances.
>From gcc-bugs-return-601728-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 19:05:37 2018
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From: "gerhard.heinzel at aei dot mpg.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85425] New: gcc 6.2.1 fails to catch error in function calling arguments
Date: Mon, 16 Apr 2018 19:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85425
Bug ID: 85425
Summary: gcc 6.2.1 fails to catch error in function calling
arguments
Product: gcc
Version: 6.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: gerhard.heinzel at aei dot mpg.de
Target Milestone: ---
Created attachment 43953
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43953&action=edit
preprocessed single C input file
Dear gcc maintainers,
First let me say that I am a very happy and grateful user of gcc since about 25
years.
I program in C under Linux and try to encourage my students to do the same.
Such C programs are the workhorse of my physics research group, although I have
to admit that the younger students now prefer C++ which I never really got used
to.
Anyway, here is the bug:
The attached program, which is already reduced to a single file that
contains about 5% of the code of the full thing,
does _NOT_ trigger an error although in my opinion it should,
when compiled with
gcc-6 -Wall -Wextra -c fail_contour.i
A function is called with messed up order of parameters,
mixing int with double.
The function is declared and defined as
contour_point_t ghhrobust_search
(contour_point_t * p, contour_point_t plast, double ax, double ay, int type)
but called as
p = ghhrobust_search (ptrials, plast, type, ax, ay);
where the integer variable "type" is at position 3 instead of at the end.
gcc (version info below) does not catch this error, which
I consider a bug.
Possibly I made a stupid mistake, in which case I'd be
grateful for a short notice.
I have tried to follow the bug reporting instructions.
If this is a real problem, I'd of course be willing to
submit more information or try to reduce the problem further
to a minimal case, although I suspect that you are much better
at that than I am.
With best greetings and thanks for your support,
Gerhard Heinzel.
-----
Using built-in specs.
COLLECT_GCC=gcc-6
Target: x86_64-suse-linux
Configured with: ../configure --prefix=/usr --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64
--enable-languages=c,c++,fortran,ada,go --enable-offload-targets=hsa
--enable-checking=release --with-gxx-include-dir=/usr/include/c++/6
--enable-ssp --disable-libssp --disable-libvtv --disable-libcc1
--disable-plugin --with-bugurl=http://bugs.opensuse.org/
--with-pkgversion='SUSE Linux' --disable-libgcj --with-slibdir=/lib64
--with-system-zlib --enable-__cxa_atexit --enable-libstdcxx-allocator=new
--disable-libstdcxx-pch --with-default-libstdcxx-abi=gcc4-compatible
--enable-version-specific-runtime-libs --enable-linker-build-id
--enable-linux-futex --enable-gnu-indirect-function --program-suffix=-6
--without-system-libunwind --enable-multilib --with-arch-32=x86-64
--with-tune=generic --build=x86_64-suse-linux --host=x86_64-suse-linux
Thread model: posix
gcc version 6.2.1 20160826 [gcc-6-branch revision 239773] (SUSE Linux)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-c' '-mtune=generic'
'-march=x86-64'
/usr/lib64/gcc/x86_64-suse-linux/6/cc1 -E -quiet -v fail_contour.c
-mtune=generic -march=x86-64 -Wall -Wextra -fpch-preprocess -o fail_contour.i
#include "..." search starts here:
#include <...> search starts here:
/usr/lib64/gcc/x86_64-suse-linux/6/include
/usr/local/include
/usr/lib64/gcc/x86_64-suse-linux/6/include-fixed
/usr/lib64/gcc/x86_64-suse-linux/6/../../../../x86_64-suse-linux/include
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-c' '-mtune=generic'
'-march=x86-64'
/usr/lib64/gcc/x86_64-suse-linux/6/cc1 -fpreprocessed fail_contour.i -quiet
-dumpbase fail_contour.c -mtune=generic -march=x86-64 -auxbase fail_contour
-Wall -Wextra -version -o fail_contour.s
GNU C11 (SUSE Linux) version 6.2.1 20160826 [gcc-6-branch revision 239773]
(x86_64-suse-linux)
compiled by GNU C version 6.2.1 20160826 [gcc-6-branch revision
239773], GMP version 5.1.3, MPFR version 3.1.2, MPC version 1.0.2, isl version
none
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C11 (SUSE Linux) version 6.2.1 20160826 [gcc-6-branch revision 239773]
(x86_64-suse-linux)
compiled by GNU C version 6.2.1 20160826 [gcc-6-branch revision
239773], GMP version 5.1.3, MPFR version 3.1.2, MPC version 1.0.2, isl version
none
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 9c15a1c4f36e0692cc50ecfa3c25d889
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-c' '-mtune=generic'
'-march=x86-64'
/usr/lib64/gcc/x86_64-suse-linux/6/../../../../x86_64-suse-linux/bin/as -v
--64 -o fail_contour.o fail_contour.s
GNU assembler version 2.29.1 (x86_64-suse-linux) using BFD version (GNU
Binutils; openSUSE Leap 42.3) 2.29.1
COMPILER_PATH=/usr/lib64/gcc/x86_64-suse-linux/6/:/usr/lib64/gcc/x86_64-suse-linux/6/:/usr/lib64/gcc/x86_64-suse-linux/:/usr/lib64/gcc/x86_64-suse-linux/6/:/usr/lib64/gcc/x86_64-suse-linux/:/usr/lib64/gcc/x86_64-suse-linux/6/../../../../x86_64-suse-linux/bin/
LIBRARY_PATH=/usr/lib64/gcc/x86_64-suse-linux/6/:/usr/lib64/gcc/x86_64-suse-linux/6/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib64/gcc/x86_64-suse-linux/6/../../../../x86_64-suse-linux/lib/:/usr/lib64/gcc/x86_64-suse-linux/6/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-c' '-mtune=generic'
'-march=x86-64'
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Subject: [Bug target/85424] The __builtin_packlongdouble function might have issues with the output overlapping the inputs
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Subject: [Bug target/84530] -mfunction-return=thunk does not work for simple_return_pop_internal insn
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84530
--- Comment #6 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Mon Apr 16 19:06:32 2018
New Revision: 259420
URL: https://gcc.gnu.org/viewcvs?rev=259420&root=gcc&view=rev
Log:
i386: Update -mfunction-return= for return with pop
When -mfunction-return= is used, simple_return_pop_internal should pop
return address into ECX register, adjust stack by bytes to pop from stack
and jump to the return thunk via ECX register.
Revision 257992 removed the bool argument from ix86_output_indirect_jmp.
Update comments to reflect it.
Tested on i686 and x86-64.
gcc/
Backport from mainline
2018-02-26 H.J. Lu <hongjiu.lu@intel.com>
* config/i386/i386.c (ix86_output_indirect_jmp): Update comments.
2018-02-26 H.J. Lu <hongjiu.lu@intel.com>
PR target/84530
* config/i386/i386-protos.h (ix86_output_indirect_jmp): Remove
the bool argument.
(ix86_output_indirect_function_return): New prototype.
(ix86_split_simple_return_pop_internal): Likewise.
* config/i386/i386.c (indirect_return_via_cx): New.
(indirect_return_via_cx_bnd): Likewise.
(indirect_thunk_name): Handle return va CX_REG.
(output_indirect_thunk_function): Create alias for
__x86_return_thunk_[re]cx and __x86_return_thunk_[re]cx_bnd.
(ix86_output_indirect_jmp): Remove the bool argument.
(ix86_output_indirect_function_return): New function.
(ix86_split_simple_return_pop_internal): Likewise.
* config/i386/i386.md (*indirect_jump): Don't pass false
to ix86_output_indirect_jmp.
(*tablejump_1): Likewise.
(simple_return_pop_internal): Change it to define_insn_and_split.
Call ix86_split_simple_return_pop_internal to split it for
-mfunction-return=.
(simple_return_indirect_internal): Call
ix86_output_indirect_function_return instead of
ix86_output_indirect_jmp.
gcc/testsuite/
Backport from mainline
2018-02-26 H.J. Lu <hongjiu.lu@intel.com>
PR target/84530
* gcc.target/i386/ret-thunk-22.c: New test.
* gcc.target/i386/ret-thunk-23.c: Likewise.
* gcc.target/i386/ret-thunk-24.c: Likewise.
* gcc.target/i386/ret-thunk-25.c: Likewise.
* gcc.target/i386/ret-thunk-26.c: Likewise.
Added:
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-22.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-23.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-24.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-25.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-26.c
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/config/i386/i386-protos.h
branches/gcc-6-branch/gcc/config/i386/i386.c
branches/gcc-6-branch/gcc/config/i386/i386.md
branches/gcc-6-branch/gcc/testsuite/ChangeLog
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Subject: [Bug target/84039] x86 retpolines and CFI
Date: Mon, 16 Apr 2018 19:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84039
--- Comment #5 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Mon Apr 16 19:08:14 2018
New Revision: 259421
URL: https://gcc.gnu.org/viewcvs?rev=259421&root=gcc&view=rev
Log:
i386: Add TARGET_INDIRECT_BRANCH_REGISTER
For
---
struct C {
virtual ~C();
virtual void f();
};
void
f (C *p)
{
p->f();
p->f();
}
---
-mindirect-branch=thunk-extern -O2 on x86-64 GNU/Linux generates:
_Z1fP1C:
.LFB0:
.cfi_startproc
pushq %rbx
.cfi_def_cfa_offset 16
.cfi_offset 3, -16
movq (%rdi), %rax
movq %rdi, %rbx
jmp .LIND1
.LIND0:
pushq 16(%rax)
jmp __x86_indirect_thunk
.LIND1:
call .LIND0
movq (%rbx), %rax
movq %rbx, %rdi
popq %rbx
.cfi_def_cfa_offset 8
movq 16(%rax), %rax
jmp __x86_indirect_thunk_rax
.cfi_endproc
x86-64 is supposed to have asynchronous unwind tables by default, but
there is nothing that reflects the change in the (relative) frame
address after .LIND0. That region really has to be moved outside of
the .cfi_startproc/.cfi_endproc bracket.
This patch adds TARGET_INDIRECT_BRANCH_REGISTER to force indirect
branch via register whenever -mindirect-branch= is used. Now,
-mindirect-branch=thunk-extern -O2 on x86-64 GNU/Linux generates:
_Z1fP1C:
.LFB0:
.cfi_startproc
pushq %rbx
.cfi_def_cfa_offset 16
.cfi_offset 3, -16
movq (%rdi), %rax
movq %rdi, %rbx
movq 16(%rax), %rax
call __x86_indirect_thunk_rax
movq (%rbx), %rax
movq %rbx, %rdi
popq %rbx
.cfi_def_cfa_offset 8
movq 16(%rax), %rax
jmp __x86_indirect_thunk_rax
.cfi_endproc
so that "-mindirect-branch=thunk-extern" is equivalent to
"-mindirect-branch=thunk-extern -mindirect-branch-register", which is
used by Linux kernel.
gcc/
Backport from mainline
2018-02-26 H.J. Lu <hongjiu.lu@intel.com>
PR target/84039
* config/i386/constraints.md (Bs): Replace
ix86_indirect_branch_register with
TARGET_INDIRECT_BRANCH_REGISTER.
(Bw): Likewise.
* config/i386/i386.md (indirect_jump): Likewise.
(tablejump): Likewise.
(*sibcall_memory): Likewise.
(*sibcall_value_memory): Likewise.
Peepholes of indirect call and jump via memory: Likewise.
(*sibcall_GOT_32): Disallowed for TARGET_INDIRECT_BRANCH_REGISTER.
(*sibcall_value_GOT_32): Likewise.
* config/i386/predicates.md (indirect_branch_operand): Likewise.
(GOT_memory_operand): Likewise.
(call_insn_operand): Likewise.
(sibcall_insn_operand): Likewise.
(GOT32_symbol_operand): Likewise.
* config/i386/i386.h (TARGET_INDIRECT_BRANCH_REGISTER): New.
gcc/testsuite/
Backport from mainline
2018-02-26 H.J. Lu <hongjiu.lu@intel.com>
PR target/84039
* gcc.target/i386/indirect-thunk-1.c: Updated.
* gcc.target/i386/indirect-thunk-2.c: Likewise.
* gcc.target/i386/indirect-thunk-3.c: Likewise.
* gcc.target/i386/indirect-thunk-4.c: Likewise.
* gcc.target/i386/indirect-thunk-5.c: Likewise.
* gcc.target/i386/indirect-thunk-6.c: Likewise.
* gcc.target/i386/indirect-thunk-7.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-1.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-2.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-3.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-4.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-5.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-6.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-7.c: Likewise.
* gcc.target/i386/indirect-thunk-bnd-1.c: Likewise.
* gcc.target/i386/indirect-thunk-bnd-2.c: Likewise.
* gcc.target/i386/indirect-thunk-bnd-3.c: Likewise.
* gcc.target/i386/indirect-thunk-bnd-4.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-1.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-2.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-3.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-4.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-5.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-6.c: Likewise.
* gcc.target/i386/indirect-thunk-extern-7.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-1.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-2.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-3.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-4.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-5.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-6.c: Likewise.
* gcc.target/i386/indirect-thunk-inline-7.c: Likewise.
* gcc.target/i386/ret-thunk-9.c: Likewise.
* gcc.target/i386/ret-thunk-10.c: Likewise.
* gcc.target/i386/ret-thunk-11.c: Likewise.
* gcc.target/i386/ret-thunk-12.c: Likewise.
* gcc.target/i386/ret-thunk-13.c: Likewise.
* gcc.target/i386/ret-thunk-14.c: Likewise.
* gcc.target/i386/ret-thunk-15.c: Likewise.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/config/i386/constraints.md
branches/gcc-6-branch/gcc/config/i386/i386.h
branches/gcc-6-branch/gcc/config/i386/i386.md
branches/gcc-6-branch/gcc/config/i386/predicates.md
branches/gcc-6-branch/gcc/testsuite/ChangeLog
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-1.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-3.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-4.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-5.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-6.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-7.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-1.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-3.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-4.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-5.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-6.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-7.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-bnd-1.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-bnd-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-bnd-3.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-bnd-4.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-1.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-3.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-4.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-5.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-6.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-7.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-1.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-2.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-3.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-4.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-5.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-6.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/indirect-thunk-inline-7.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-10.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-11.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-12.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-13.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-14.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-15.c
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-9.c
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From: "hjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/84574] Function return thunks shouldn't be aliased to indirect branch thunks
Date: Mon, 16 Apr 2018 19:11:00 -0000
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--- Comment #4 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Mon Apr 16 19:11:13 2018
New Revision: 259422
URL: https://gcc.gnu.org/viewcvs?rev=259422&root=gcc&view=rev
Log:
i386: Don't generate alias for function return thunk
Function return thunks shouldn't be aliased to indirect branch thunks
since indirect branch thunks are placed in COMDAT section and a COMDAT
section with indirect branch may not have function return thunk. This
patch generates function return thunks directly.
gcc/
Backport from mainline
PR target/84574
* config/i386/i386.c (indirect_thunk_needed): Update comments.
(indirect_thunk_bnd_needed): Likewise.
(indirect_thunks_used): Likewise.
(indirect_thunks_bnd_used): Likewise.
(indirect_return_needed): New.
(indirect_return_bnd_needed): Likewise.
(output_indirect_thunk_function): Add a bool argument for
function return.
(output_indirect_thunk_function): Don't generate alias for
function return thunk.
(ix86_code_end): Call output_indirect_thunk_function to generate
function return thunks.
(ix86_output_function_return): Set indirect_return_bnd_needed
and indirect_return_needed instead of indirect_thunk_bnd_needed
and indirect_thunk_needed.
gcc/testsuite/
Backport from mainline
PR target/84574
* gcc.target/i386/ret-thunk-9.c: Expect __x86_return_thunk
label instead of __x86_indirect_thunk label.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/config/i386/i386.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
branches/gcc-6-branch/gcc/testsuite/gcc.target/i386/ret-thunk-9.c
>From gcc-bugs-return-601732-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 19:25:11 2018
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Subject: [Bug c/85419] Incorrect determination of null pointer constant
Date: Mon, 16 Apr 2018 19:25:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |msebor at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Because they don't produce lvalues top-level qualifiers in casts are
meaningless. As a result (void* restrict)0 is the same as (void*)0 and the
result is a null pointer constant.
>From gcc-bugs-return-601733-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 19:42:40 2018
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Sasha Unknown <sasha2048 at gmail dot com> changed:
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CC| |sasha2048 at gmail dot com
--- Comment #2 from Sasha Unknown <sasha2048 at gmail dot com> ---
I confirm that this still happens on my g++-7 (Ubuntu 7.2.0-1ubuntu1~16.04)
7.2.0.
My test program (essentially the same as original):
template<typename T>
struct S {};
template<typename T>
void f() {
auto s = S<T>(), i = 1;
}
int main() {
f<int>();
return 0;
}
>From gcc-bugs-return-601734-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 19:48:58 2018
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Subject: [Bug c/85425] gcc 6.2.1 fails to catch error in function calling arguments
Date: Mon, 16 Apr 2018 19:48:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The example can be reduced to:
void ghhrobust_search (double ay, int type) { }
void f(int i, double d) { ghhrobust_search(i, d); }
This must not produce an error, because it is 100% valid according to the C
standard. An int can be converted to a double and a double can be converted to
an int, so the code is valid.
If you use -Wconversion you get a warning:
a.c: In function ‘void f(int, double)’:
a.c:3:48: warning: conversion to ‘int’ from ‘double’ may alter its value
[-Wfloat-conversion]
void f(int i, double d) { ghhrobust_search(i, d); }
^
This seems to be what you're looking for. Indeed, compiling your attached code
with -Wconversion gives a warning on the relevant line:
fail_contour.c: In function ‘contour_trace’:
fail_contour.c:203:56: warning: conversion to ‘int’ from ‘double’ may alter its
value [-Wfloat-conversion]
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Subject: [Bug c/85418] -Wformat-truncation on inlinned function
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |RESOLVED
CC| |msebor at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
The warning is intended (and designed to trigger across inlined function
calls). The call to snprintf() truncates the string which may be unintended.
To avoid the warning either use the return value of the snprintf function to
take some action (i.e., handle the truncation) or use the len argument to
specify the precision of the %s directive like so:
snprintf (b, sizeof b, "%.*s", (int)len, s);
>From gcc-bugs-return-601736-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 20:00:45 2018
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2018-04-16
Ever confirmed|0 |1
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Confirmed. Clang rejects the original with:
auto.cc:5:3: error: 'auto' deduced as 'long' in declaration of 'i' and deduced
as 'int' in declaration of 'j'
auto i = t, j = 1;
^ ~ ~
auto.cc:25:3: note: in instantiation of function template specialization
'foo<long>' requested here
foo (0L);
^
auto.cc:12:3: error: 'auto' deduced as 'int' in declaration of 'i' and deduced
as 'long' in declaration of 'j'
auto i = 1, j = t, k = 2;
^ ~ ~
auto.cc:26:3: note: in instantiation of function template specialization
'bar<long>' requested here
bar (0L);
^
auto.cc:19:3: error: 'auto' deduced as 'int' in declaration of 'i' and deduced
as 'long' in declaration of 'j'
auto i = t, j = u;
^ ~ ~
auto.cc:27:3: note: in instantiation of function template specialization
'foo<int, long>' requested here
foo (1, 2L);
^
3 errors generated.
And similarly for comment 2:
auto.cc:7:9: error: 'auto' deduced as 'S<int>' in declaration of 's' and
deduced as 'int' in declaration of 'i'
auto s = S<T>(), i = 1;
^ ~~~~~~ ~
auto.cc:11:9: note: in instantiation of function template specialization
'f<int>' requested here
f<int>();
^
1 error generated.
>From gcc-bugs-return-601737-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 20:02:46 2018
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Subject: [Bug c++/59960] accepts ill-formed 'auto a1 = t1, a2 = t2;' where t1 and t2 have different template types
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |DUPLICATE
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
As noted in comment 1 this is a dup of another bug with additional details, so
I'm closing this one despite it being reported first.
*** This bug has been marked as a duplicate of bug 79009 ***
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79009
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |gcc at abeckmann dot de
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 59960 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-601739-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 20:05:48 2018
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From: "gerhard.heinzel at aei dot mpg.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85425] gcc 6.2.1 fails to catch error in function calling arguments
Date: Mon, 16 Apr 2018 20:05:00 -0000
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--- Comment #2 from Gerhard Heinzel <gerhard.heinzel at aei dot mpg.de> ---
(In reply to Jonathan Wakely from comment #1)
Many thanks for your quick response.
I normally don't use -Wconversion because it floods me with
uninteresting errors about size_t, floor(), and code from bison/flex etc.
But I'll try to use it more now.
Cheers,
Gerhard
> The example can be reduced to:
>
> void ghhrobust_search (double ay, int type) { }
>
> void f(int i, double d) { ghhrobust_search(i, d); }
>
> This must not produce an error, because it is 100% valid according to the C
> standard. An int can be converted to a double and a double can be converted
> to an int, so the code is valid.
>
> If you use -Wconversion you get a warning:
>
>
> a.c: In function ‘void f(int, double)’:
> a.c:3:48: warning: conversion to ‘int’ from ‘double’ may alter its value
> [-Wfloat-conversion]
> void f(int i, double d) { ghhrobust_search(i, d); }
> ^
>
> This seems to be what you're looking for. Indeed, compiling your attached
> code with -Wconversion gives a warning on the relevant line:
>
> fail_contour.c: In function ‘contour_trace’:
> fail_contour.c:203:56: warning: conversion to ‘int’ from ‘double’ may alter
> its value [-Wfloat-conversion]
>From gcc-bugs-return-601740-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 20:20:58 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/85425] gcc 6.2.1 fails to catch error in function calling arguments
Date: Mon, 16 Apr 2018 20:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85425
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-16
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Gerhard Heinzel from comment #2)
> (In reply to Jonathan Wakely from comment #1)
>
> Many thanks for your quick response.
> I normally don't use -Wconversion because it floods me with
> uninteresting errors about size_t, floor(), and code from bison/flex etc.
Yes, it's true that it produces a lot of warnings (which is why it isn't
enabled by -Wall).
It might be possible to add a new warning for cases where the arguments are
"obviously" transposed.
For example, in my reduced version:
void ghhrobust_search (double ay, int type) { }
void f(int i, double d) { ghhrobust_search(i, d); }
Although both conversions are allowed by the language, the fact that swapping
the arguments would require no conversions could be used to detect cases that
might be accidental.
Confirming as an enhancement request for a new warning.
>From gcc-bugs-return-601741-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 20:31:37 2018
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From: "phantall at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85400] R_SPARC_TLS_*: invalid relocations generated for optimized builds on sparc
Date: Mon, 16 Apr 2018 20:31:00 -0000
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--- Comment #2 from Brian Vandenberg <phantall at gmail dot com> ---
Sorry, I was hand-typing from an air-gapped network. I left the type name
out; line 5 should read:
> thread_local int mything = 3;
-brian
On Mon, Apr 16, 2018 at 2:52 AM, ebotcazou at gcc dot gnu.org <
gcc-bugzilla@gcc.gnu.org> wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85400
>
> Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
>
> What |Removed |Added
> ------------------------------------------------------------
> ----------------
> Status|UNCONFIRMED |WAITING
> Last reconfirmed| |2018-04-16
> CC| |ebotcazou at gcc dot
> gnu.org
> Ever confirmed|0 |1
>
> --- Comment #1 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> > In Solaris 10 & 11 using GCC versions 4.8, 4.9.2, 7.2.0 I get relocation
> > errors when thread_local variables are used in a struct/class. Example
> code
> > that reproduces the problem:
> >
> > > struct Test {
> > > int blah( int y ) {
> > > thread_local mything = 3;
> > > mything = y > 0 ? y : mything;
> > > return mything;
> > > }
> > > };
> > > int stuff( Test& test, int y ) {
> > > return test.blah(y);
> > > }
>
> This doesn't compile for me:
>
> pr85400.C: In member function 'int Test::blah(int)':
> pr85400.C:5:18: error: 'mything' does not name a type
> thread_local mything = 3;
> ^~~~~~~
> pr85400.C:6:5: error: 'mything' was not declared in this scope
> mything = y > 0 ? y : mything;
> ^~~~~~~
>
> > * The compilers I built and those produced by OpenCSW use the Solaris
> > assembler (/usr/ccs/bin/as) instead of gas.
>
> Do you have local patches? My compiler is the stock GCC 8.x:
>
> Using built-in specs.
> COLLECT_GCC=g++
> COLLECT_LTO_WRAPPER=/nfs/homes/homes/botcazou/gcc-head/
> install_sparc/bin/../libexec/gcc/sparc-sun-solaris2.10/8.0.1/lto-wrapper
> Target: sparc-sun-solaris2.10
> Configured with: /homes/botcazou/gcc-head/src/configure
> --build=sparc-sun-solaris2.10 --prefix=/homes/botcazou/gcc-
> head/install_sparc
> --with-as=/homes/botcazou/gcc-head/install_sparc/bin/as
> --with-gmp=/homes/botcazou/support/sparc
> --with-mpfr=/homes/botcazou/support/sparc
> --with-mpc=/homes/botcazou/support/sparc --enable-languages=all
> --disable-nls
> Thread model: posix
> gcc version 8.0.1 20180325 (experimental) (GCC)
>
> --
> You are receiving this mail because:
> You reported the bug.
>
>From gcc-bugs-return-601742-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 21:01:13 2018
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Subject: [Bug bootstrap/84856] Bootstrap failure on riscv: comparison of integer expressions of different signedness
Date: Mon, 16 Apr 2018 21:01:00 -0000
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--- Comment #8 from Jim Wilson <wilson at gcc dot gnu.org> ---
I copied the design of the patch from the i386 backend, so in theory it should
work. The layout of the stack is completely at the control of the target
backend, so uses of STACK_BOUNDARY outside the backend should not be a problem.
I did some sanity checking when I made the check, but now that you point the
problem out I see that I missed two cases. outgoing_args_size and
pretend_args_size are not longer rounded to the PREFERRED_STACK_BOUNDARY size,
they are rounded to the smaller STACK_BOUNDARY size instead. We can fix this
in riscv_compute_frame_info by adding RISCV_STACK_ALIGN macro calls around the
uses of these two values. This is a simple fix. I'm testing a patch now.
>From gcc-bugs-return-601743-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 21:30:46 2018
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Subject: [Bug target/85417] -fcf-protection should provide CET protection on x86
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--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 43954
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43954&action=edit
A patch
I am testing this patch.
>From gcc-bugs-return-601744-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 21:36:12 2018
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Subject: [Bug c++/85039] [6/7/8 Regression] internal compiler error: in nested_anon_class_index, at cp/mangle.c:1626
Date: Mon, 16 Apr 2018 21:36:00 -0000
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--- Comment #5 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Author: aoliva
Date: Mon Apr 16 21:35:34 2018
New Revision: 259423
URL: https://gcc.gnu.org/viewcvs?rev=259423&root=gcc&view=rev
Log:
[PR c++/85039] no type definitions in builtin offsetof
Types defined within a __builtin_offsetof argument don't always get
properly recorded as members of their context types, so if they're
anonymous, we may fail to assign them an anon type index for mangling
and ICE.
We shouldn't allow types to be introduced in __builtin_offsetof, I
think, and Jason says the std committee agrees, so I've arranged for
us to reject them.
Even then, we still parse the definitions and attempt to assign
mangled names to its member functions, so the ICE remains. Since
we've already reported an error, we might as well complete the name
assignment with an arbitrary index, thus avoiding the ICE.
We used to have a test that expected to be able to define types in
__builtin_offsetof; this patch removes that specific test.
for gcc/cp/ChangeLog
PR c++/85039
* parser.c (cp_parser_builtin_offset): Reject type definitions.
* mangle.c (nested_anon_class_index): Avoid crash returning -1
if we've seen errors.
for gcc/testsuite/ChangeLog
PR c++/85039
* g++.dg/pr85039-1.C: New.
* g++.dg/pr85039-2.C: New.
* g++.dg/parse/semicolon3.C: Remove test_offsetof.
Added:
trunk/gcc/testsuite/g++.dg/pr85039-1.C
trunk/gcc/testsuite/g++.dg/pr85039-2.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/mangle.c
trunk/gcc/cp/parser.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/parse/semicolon3.C
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Subject: [Bug ipa/85421] [8 regression] internal compiler error: in ipa_propagate_frequency, at ipa-profile.c:405
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85421
Martin Jambor <jamborm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |marxin at gcc dot gnu.org
Component|c++ |ipa
Assignee|unassigned at gcc dot gnu.org |jamborm at gcc dot gnu.org
--- Comment #3 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Mine. Fixed by the following:
diff --git a/gcc/ipa-cp.c b/gcc/ipa-cp.c
index b2627ffd05f..4e0e20af409 100644
--- a/gcc/ipa-cp.c
+++ b/gcc/ipa-cp.c
@@ -3863,6 +3863,7 @@ create_specialized_node (struct cgraph_node *node,
new_node = node->create_virtual_clone (callers, replace_trees,
args_to_skip, "constprop");
+ bool have_self_recursive_calls = !self_recursive_calls.is_empty ();
for (unsigned j = 0; j < self_recursive_calls.length (); j++)
{
cgraph_edge *cs = next_edge_clone[self_recursive_calls[j]->uid];
@@ -3870,6 +3871,8 @@ create_specialized_node (struct cgraph_node *node,
gcc_assert (cs->caller == new_node);
cs->redirect_callee_duplicating_thunks (new_node);
}
+ if (have_self_recursive_calls)
+ new_node->expand_all_artificial_thunks ();
ipa_set_node_agg_value_chain (new_node, aggvals);
for (av = aggvals; av; av = av->next)
>From gcc-bugs-return-601746-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 16 22:20:09 2018
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Thanks, I can reproduce now, including with the GNU assembler.
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Investigating.
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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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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |NEW
Assignee|aoliva at gcc dot gnu.org |unassigned at gcc dot gnu.org
Summary|[6/7/8 Regression] internal |[6/7 Regression] internal
|compiler error: in |compiler error: in
|nested_anon_class_index, at |nested_anon_class_index, at
|cp/mangle.c:1626 |cp/mangle.c:1626
--- Comment #6 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Fixed for 8
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |patch
Status|NEW |ASSIGNED
--- Comment #20 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Patch posted
https://gcc.gnu.org/ml/gcc-patches/2018-04/msg00709.html
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Subject: [Bug rtl-optimization/85426] New: ICE in patch_jump_insn, at cfgrtl.c:1271
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Bug ID: 85426
Summary: ICE in patch_jump_insn, at cfgrtl.c:1271
Product: gcc
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Target: powerpc-*-linux-gnu*, powerpcspe-*-linux-gnu*
gcc-8.0.0-alpha20180415 snapshot (r259389) ICEs when compiling the following
snippet w/ -mcpu=8548 -O1 (-O2, -O3, -Ofast) -fmodulo-sched
-fprefetch-loop-arrays -freorder-blocks-and-partition
-ftree-parallelize-loops=2 -fno-ivopts:
long long unsigned int
c8 (int *zf, int v2)
{
int ns;
long long unsigned int sv = 0;
for (ns = 0; ns < v2; ++ns)
sv += zf[ns] / ns;
return sv;
}
% powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20180415 -mcpu=8548 -O1
-fmodulo-sched -fprefetch-loop-arrays -freorder-blocks-and-partition
-ftree-parallelize-loops=2 -fno-ivopts -c t3kxgcui.c
during RTL pass: sms
t3kxgcui.c: In function 'c8._loopfn.0':
t3kxgcui.c:7:3: internal compiler error: in patch_jump_insn, at cfgrtl.c:1271
for (ns = 0; ns < v2; ++ns)
^
0x74d7a2 patch_jump_insn
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgrtl.c:1271
0x74dd52 redirect_branch_edge
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgrtl.c:1297
0x74e02a cfg_layout_redirect_edge_and_branch
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgrtl.c:4437
0x74e1d7 cfg_layout_redirect_edge_and_branch_force
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgrtl.c:4451
0x7319f8 redirect_edge_and_branch_force(edge_def*, basic_block_def*)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfghooks.c:486
0x7327ed make_forwarder_block(basic_block_def*, bool (*)(edge_def*), void
(*)(basic_block_def*))
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfghooks.c:893
0x73bbff merge_latch_edges
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgloop.c:780
0x73bbff disambiguate_multiple_latches
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgloop.c:831
0x73bbff disambiguate_loops_with_multiple_latches()
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgloop.c:844
0xa73474 apply_loop_flags
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/loop-init.c:54
0xa74105 loop_optimizer_init(unsigned int)
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/loop-init.c:123
0x14c78d5 sms_schedule
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/modulo-sched.c:1354
0x14ca3a2 execute
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/modulo-sched.c:3345
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Subject: [Bug rtl-optimization/84842] [7/8 Regression] ICE in verify_target_availability, at sel-sched.c:1569
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--- Comment #10 from Arseny Solokha <asolokha at gmx dot com> ---
Created attachment 43955
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43955&action=edit
gcc/auto-host.h
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Subject: [Bug bootstrap/84856] Bootstrap failure on riscv: comparison of integer expressions of different signedness
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--- Comment #9 from Kito Cheng <npickito at gmail dot com> ---
Hi Jim:
Yeah, you are right, so I guess just some missing in back-end now, thanks your
quick response :)
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Subject: [Bug bootstrap/85413] "./configure --with-build-config=bootstrap-lto " != "BOOT_CFLAGS +=-flto "
Date: Tue, 17 Apr 2018 03:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85413
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The difference between -flto and -flto=jobserver is minor (just speed of
linking). I don't think this minor difference would cause the need to update
the documentation.
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Subject: [Bug c/85427] New: internal compiler error: in constant_lower_bound, at poly-int.h:1527
Date: Tue, 17 Apr 2018 05:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85427
Bug ID: 85427
Summary: internal compiler error: in constant_lower_bound, at
poly-int.h:1527
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
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$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/suhua/compilers/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 8.0.1 20180416 (experimental) [trunk revision 259396] (GCC)
$ gcc-trunk abc.c
during RTL pass: expand
abc.c: In function ‘fn1’:
abc.c:3:13: internal compiler error: in constant_lower_bound, at
poly-int.h:1527
int fn1() { fn1(a, b, c, d, e, f, g, h, i, j, k); }
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0x5ff4f0 long constant_lower_bound<1u, long>(poly_int_pod<1u, long> const&)
../../gcc/gcc/poly-int.h:1527
0x5ff4f0 expand_call(tree_node*, rtx_def*, int)
../../gcc/gcc/calls.c:3763
0x9b26ab expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
../../gcc/gcc/expr.c:11007
0x8ad45e expand_expr
../../gcc/gcc/expr.h:280
0x8ad45e expand_call_stmt
../../gcc/gcc/cfgexpand.c:2690
0x8ad45e expand_gimple_stmt_1
../../gcc/gcc/cfgexpand.c:3624
0x8ad45e expand_gimple_stmt
../../gcc/gcc/cfgexpand.c:3790
0x8ae4df expand_gimple_basic_block
../../gcc/gcc/cfgexpand.c:5819
0x8b30b7 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.
$ cat abc.c
typedef struct { char type[900000000000000000]; } t;
t a, b, c, d, e, f, g, h, i, j, k;
int fn1() { fn1(a, b, c, d, e, f, g, h, i, j, k); }
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Subject: [Bug ipa/85329] [8 Regression] ICE in add_to_same_comdat_group, at symtab.c:460
Date: Tue, 17 Apr 2018 05:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85329
--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Apr 17 05:40:39 2018
New Revision: 259428
URL: https://gcc.gnu.org/viewcvs?rev=259428&root=gcc&view=rev
Log:
Make redirection only for target_clones: V3 (PR ipa/85329).
2018-04-17 Martin Liska <mliska@suse.cz>
PR ipa/85329
* multiple_target.c (create_dispatcher_calls): Set apostrophes
for target_clone error message. Make default implementation
clone to be a local declaration.
(separate_attrs): Add new argument and check for an empty
string.
(expand_target_clones): Handle it.
(ipa_target_clone): Make redirection just for target_clones
functions.
2018-04-17 Martin Liska <mliska@suse.cz>
PR ipa/85329
* g++.dg/ext/pr85329-2.C: New test.
* g++.dg/ext/pr85329.C: New test.
* gcc.target/i386/mvc12.c: New test.
Added:
trunk/gcc/testsuite/g++.dg/ext/pr85329-2.C
trunk/gcc/testsuite/g++.dg/ext/pr85329.C
trunk/gcc/testsuite/gcc.target/i386/mvc12.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/multiple_target.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug ipa/85329] [8 Regression] ICE in add_to_same_comdat_group, at symtab.c:460
Date: Tue, 17 Apr 2018 05:42:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed on trunk.
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Subject: [Bug lto/85405] [6/7 Regression] ICE in odr_types_equivalent_p, at ipa-devirt.c:1581
Date: Tue, 17 Apr 2018 05:42:00 -0000
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Apr 17 05:41:40 2018
New Revision: 259429
URL: https://gcc.gnu.org/viewcvs?rev=259429&root=gcc&view=rev
Log:
Support bitfields in Wodr machinery (PR lto/85405).
2018-04-17 Jan Hubicka <jh@suse.cz>
PR lto/85405
* ipa-devirt.c (odr_types_equivalent_p): Handle bit fields.
2018-04-17 Martin Liska <mliska@suse.cz>
PR lto/85405
* g++.dg/lto/pr85405_0.C: New test.
* g++.dg/lto/pr85405_1.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/lto/pr85405_0.C
trunk/gcc/testsuite/g++.dg/lto/pr85405_1.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ipa-devirt.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug lto/85405] [6/7 Regression] ICE in odr_types_equivalent_p, at ipa-devirt.c:1581
Date: Tue, 17 Apr 2018 05:42:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |8.0.1
Known to fail|8.0.1 |
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed on trunk.
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Subject: [Bug c/85427] ICE in constant_lower_bound, at poly-int.h:1527
Date: Tue, 17 Apr 2018 06:09:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-17
CC| |marxin at gcc dot gnu.org
Summary|internal compiler error: in |ICE in
|constant_lower_bound, at |constant_lower_bound, at
|poly-int.h:1527 |poly-int.h:1527
Ever confirmed|0 |1
Known to fail| |6.4.0, 7.3.0, 8.0
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, all releases I have ICE. On GCC 5,6,7 there is a compile hog fixed
on trunk in r258704. If I backport the patch to GCC-7 I see the same ICE.
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Subject: [Bug rtl-optimization/85426] ICE in patch_jump_insn, at cfgrtl.c:1271
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--- Comment #1 from Arseny Solokha <asolokha at gmx dot com> ---
Martin, is this PR actually related to selective scheduling?
>From gcc-bugs-return-601761-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 06:22:05 2018
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Subject: [Bug target/85417] -fcf-protection should provide CET protection on x86
Date: Tue, 17 Apr 2018 06:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85417
--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to H.J. Lu from comment #2)
> I am working to enable CET on Linux with a single binary. -fcf-protection
> should provide CET protection on x86 by default. We can add a command-line
> option if we want a different implementation.
This should remain an opt-in feature, not opt-out. We can have
--with-fcf-protection configure option to override the default.
>From gcc-bugs-return-601762-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 06:27:12 2018
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Subject: [Bug c++/85415] internal compiler error: in finish_member_declaration, at cp/semantics.c:2984
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-17
CC| |marxin at gcc dot gnu.org,
| |nathan at gcc dot gnu.org
Ever confirmed|0 |1
Known to fail| |7.3.0, 8.0.1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
ICE started with r243723. Before that it was rejected.
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Subject: [Bug rtl-optimization/85426] ICE in patch_jump_insn, at cfgrtl.c:1271
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks|85099 |
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Ups, I overlooked, it's modulo scheduler used in options.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85099
[Bug 85099] [meta-bug] selective scheduling issues
>From gcc-bugs-return-601765-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 06:30:55 2018
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Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
Date: Tue, 17 Apr 2018 06:30:00 -0000
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
And please output of adding --verbose option.
>From gcc-bugs-return-601764-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 06:30:25 2018
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Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Can't reproduce on Haswell i7 CPU.
Can you Martin please attach assembly (-S) for both native and not native
build?
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Subject: [Bug target/85281] [8 Regression] Assembler messages: Error: operand size mismatch for `vpbroadcastb' with -mavx512bw -masm=intel
Date: Tue, 17 Apr 2018 07:08:00 -0000
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Apr 17 07:08:06 2018
New Revision: 259430
URL: https://gcc.gnu.org/viewcvs?rev=259430&root=gcc&view=rev
Log:
PR target/85281
* config/i386/sse.md (reduces<mode><mask_scalar_name>,
avx512f_vmcmp<mode>3<round_saeonly_name>,
avx512f_vmcmp<mode>3_mask<round_saeonly_name>,
avx512f_sgetexp<mode><mask_scalar_name><round_saeonly_scalar_name>,
avx512f_rndscale<mode><round_saeonly_name>,
avx512dq_ranges<mode><mask_scalar_name><round_saeonly_scalar_name>,
avx512f_vgetmant<mode><mask_scalar_name><round_saeonly_scalar_name>):
Use %<iptr>2 instead of %2 for -masm=intel.
(avx512f_vcvtss2usi<round_name>, avx512f_vcvtss2usiq<round_name>,
avx512f_vcvttss2usi<round_saeonly_name>,
avx512f_vcvttss2usiq<round_saeonly_name>): Use %k1 instead of %1 for
-masm=intel.
(avx512f_vcvtsd2usi<round_name>, avx512f_vcvtsd2usiq<round_name>,
avx512f_vcvttsd2usi<round_saeonly_name>,
avx512f_vcvttsd2usiq<round_saeonly_name>, ufloatv2siv2df2<mask_name>):
Use %q1 instead of %1 for -masm=intel.
(avx512f_sfixupimm<mode><sd_maskz_name><round_saeonly_name>,
avx512f_sfixupimm<mode>_mask<round_saeonly_name>): Use %<iptr>3 instead
of %3 for -masm=intel.
(sse2_shufpd_v2df_mask): Fix a typo, change %{6%} to %{%6%} for
-masm=intel.
(*avx512vl_<code>v2div2qi2_store): Use %w0 instead of %0 for
-masm=intel.
(*avx512vl_<code><mode>v4qi2_store): Use %k0 instead of %0 for
-masm=intel.
(avx512vl_<code><mode>v4qi2_mask_store): Use a single pattern with
%k0 and %1 for -masm=intel rather than two patterns, one with %0 and
%g1.
(*avx512vl_<code><mode>v8qi2_store): Use %q0 instead of %0 for
-masm=intel.
(avx512vl_<code><mode>v8qi2_mask_store): Use a single pattern with
%q0 and %1 for -masm=intel rather than two patterns, one with %0 and
%g1 and one with %0 and %1.
(avx512er_vmrcp28<mode><round_saeonly_name>,
avx512er_vmrsqrt28<mode><round_saeonly_name>): Use %<iptr>1 instead of
%1 for -masm=intel.
(avx5124fmaddps_4fmaddps_mask, avx5124fmaddps_4fmaddss_mask,
avx5124fmaddps_4fnmaddps_mask, avx5124fmaddps_4fnmaddss_mask,
avx5124vnniw_vp4dpwssd_mask, avx5124vnniw_vp4dpwssds_mask): Swap order
of %0 and %{%4%} for -masm=intel.
(avx5124fmaddps_4fmaddps_maskz, avx5124fmaddps_4fmaddss_maskz,
avx5124fmaddps_4fnmaddps_maskz, avx5124fmaddps_4fnmaddss_maskz,
avx5124vnniw_vp4dpwssd_maskz, avx5124vnniw_vp4dpwssds_maskz): Swap
order of %0 and %{%5%}%{z%} for -masm=intel.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/sse.md
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Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
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--- Comment #4 from Martin Reinecke <martin@mpa-garching.mpg.de> ---
Created attachment 43956
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43956&action=edit
reduced test case
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--- Comment #6 from Martin Reinecke <martin@mpa-garching.mpg.de> ---
Created attachment 43958
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43958&action=edit
assembler output with -march=native
>From gcc-bugs-return-601768-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 07:13:08 2018
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From: "martin@mpa-garching.mpg.de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
Date: Tue, 17 Apr 2018 07:13:00 -0000
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--- Comment #5 from Martin Reinecke <martin@mpa-garching.mpg.de> ---
Created attachment 43957
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assembler output without -march=native
>From gcc-bugs-return-601770-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 07:16:15 2018
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From: "martin@mpa-garching.mpg.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
Date: Tue, 17 Apr 2018 07:16:00 -0000
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--- Comment #7 from Martin Reinecke <martin@mpa-garching.mpg.de> ---
Here is the output of --verbose:
martin@martin-Latitude-E7450 ~/tmp $ gcc -O3 testcase2.c --verbose -lm -S
Using built-in specs.
COLLECT_GCC=gcc
Target: x86_64-pc-linux-gnu
Configured with: /home/martin/codes/gccgit/configure --disable-bootstrap
--disable-multilib --prefix=/home/martin/codes/utrunk
--enable-languages=c++,fortran --enable-target=all --enable-checking=release
Thread model: posix
gcc version 8.0.1 20180411 (experimental) [trunk revision
b3ed066d3a5:895af22275d:7d24c3846c904b6e1ffea0bee0c58a9f7bcc23cb] (GCC)
COLLECT_GCC_OPTIONS='-O3' '-v' '-S' '-mtune=generic' '-march=x86-64'
/home/martin/codes/utrunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.1/cc1 -quiet -v
-imultiarch x86_64-linux-gnu testcase2.c -quiet -dumpbase testcase2.c
-mtune=generic -march=x86-64 -auxbase testcase2 -O3 -version -o testcase2.s
GNU C17 (GCC) version 8.0.1 20180411 (experimental) [trunk revision
b3ed066d3a5:895af22275d:7d24c3846c904b6e1ffea0bee0c58a9f7bcc23cb]
(x86_64-pc-linux-gnu)
compiled by GNU C version 5.4.0 20160609, GMP version 6.1.0, MPFR
version 3.1.4, MPC version 1.0.3, isl version isl-0.16.1-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/home/martin/codes/utrunk/lib/gcc/x86_64-pc-linux-gnu/8.0.1/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/home/martin/codes/utrunk/lib/gcc/x86_64-pc-linux-gnu/8.0.1/include
/usr/local/include
/home/martin/codes/utrunk/include
/home/martin/codes/utrunk/lib/gcc/x86_64-pc-linux-gnu/8.0.1/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
GNU C17 (GCC) version 8.0.1 20180411 (experimental) [trunk revision
b3ed066d3a5:895af22275d:7d24c3846c904b6e1ffea0bee0c58a9f7bcc23cb]
(x86_64-pc-linux-gnu)
compiled by GNU C version 5.4.0 20160609, GMP version 6.1.0, MPFR
version 3.1.4, MPC version 1.0.3, isl version isl-0.16.1-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 08c992208389b44fd477c64ce2b4d084
COMPILER_PATH=/home/martin/codes/utrunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.1/:/home/martin/codes/utrunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.1/:/home/martin/codes/utrunk/libexec/gcc/x86_64-pc-linux-gnu/:/home/martin/codes/utrunk/lib/gcc/x86_64-pc-linux-gnu/8.0.1/:/home/martin/codes/utrunk/lib/gcc/x86_64-pc-linux-gnu/
LIBRARY_PATH=/home/martin/codes/utrunk/lib/gcc/x86_64-pc-linux-gnu/8.0.1/:/home/martin/codes/utrunk/lib/gcc/x86_64-pc-linux-gnu/8.0.1/../../../../lib64/:/lib/x86_64-linux-gnu/:/lib/../lib64/:/usr/lib/x86_64-linux-gnu/:/home/martin/codes/utrunk/lib/gcc/x86_64-pc-linux-gnu/8.0.1/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-O3' '-v' '-S' '-mtune=generic' '-march=x86-64'
>From gcc-bugs-return-601771-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 07:34:47 2018
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Subject: [Bug target/85381] [og7, nvptx, openacc] parallel-loop-1.c fails with default vector length 128
Date: Tue, 17 Apr 2018 07:34:00 -0000
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--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
I minimized this failure, and ran into PR 80035/81069, so I've backported the
fix from trunk: https://gcc.gnu.org/ml/gcc-patches/2018-04/msg00774.html
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Subject: [Bug rtl-optimization/85426] ICE in patch_jump_insn, at cfgrtl.c:1271
Date: Tue, 17 Apr 2018 07:44:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Isn't this just a dup of PR85408?
>From gcc-bugs-return-601773-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 08:29:00 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/85405] [6/7 Regression] ICE in odr_types_equivalent_p, at ipa-devirt.c:1581
Date: Tue, 17 Apr 2018 08:29:00 -0000
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Tue Apr 17 08:28:21 2018
New Revision: 259431
URL: https://gcc.gnu.org/viewcvs?rev=259431&root=gcc&view=rev
Log:
Fix coding style and add a new test-case (PR lto/85405).
2018-04-17 Martin Liska <mliska@suse.cz>
PR lto/85405
* ipa-devirt.c (odr_types_equivalent_p): Remove trailing
in message, remote space in between '_G' and '('.
2018-04-17 Martin Liska <mliska@suse.cz>
PR lto/85405
* g++.dg/lto/pr85405b_0.C: New test.
* g++.dg/lto/pr85405b_1.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/lto/pr85405b_0.C
trunk/gcc/testsuite/g++.dg/lto/pr85405b_1.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ipa-devirt.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-601774-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 08:49:44 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/85421] [8 regression] internal compiler error: in ipa_propagate_frequency, at ipa-profile.c:405
Date: Tue, 17 Apr 2018 08:49:00 -0000
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--- Comment #4 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Author: jamborm
Date: Tue Apr 17 08:48:41 2018
New Revision: 259432
URL: https://gcc.gnu.org/viewcvs?rev=259432&root=gcc&view=rev
Log:
Call expand_all_artificial_thunks in ipa-cp if necessary
2018-04-17 Martin Jambor <mjambor@suse.cz>
PR ipa/85421
* ipa-cp.c (create_specialized_node): Call
expand_all_artificial_thunks if necessary.
testsuite/
* g++.dg/ipa/pr85421.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/ipa/pr85421.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ipa-cp.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-601775-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 08:53:16 2018
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From: "stinkingmadgod at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85428] New: constexpr pointer equality comparison not considered constant expression
Date: Tue, 17 Apr 2018 08:53:00 -0000
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Bug ID: 85428
Summary: constexpr pointer equality comparison not considered
constant expression
Product: gcc
Version: 7.3.0
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The following should compile
template<typename T>
struct S
{
inline static char c;
};
void foo()
{
constexpr auto t1 = &S<int>::c;
constexpr auto t2 = &S<char>::c;
static_assert(t1 != t2);
}
But won't, with error: non-constant condition for static assertion.
[expr.eq] says the pointers is specified to be unequal, and [expr.const] says
this is a constant expression.
However this compiles
inline char c1, c2;
void bar()
{
constexpr auto t1 = &c1;
constexpr auto t2 = &c2;
static_assert(t1 != t2);
}
Related is bug 70248 where the compiler accepts unspecified equality
comparisons as constant expressions when it shouldn't.
>From gcc-bugs-return-601776-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 08:56:31 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/85413] "./configure --with-build-config=bootstrap-lto " != "BOOT_CFLAGS +=-flto "
Date: Tue, 17 Apr 2018 08:56:00 -0000
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--- Comment #2 from ДилÑн Палаузов <dilyan.palauzov at aegee dot org> ---
config/bootstrap-lto.mk contains more tweaks:
# This option enables LTO for stage2 and stage3 in slim mode
STAGE2_CFLAGS += -flto=jobserver -frandom-seed=1
STAGE3_CFLAGS += -flto=jobserver -frandom-seed=1
STAGEprofile_CFLAGS += -fno-lto
# assumes the host supports the linker plugin
LTO_AR = $$r/$(HOST_SUBDIR)/prev-gcc/gcc-ar$(exeext)
-B$$r/$(HOST_SUBDIR)/prev-gcc/
LTO_RANLIB = $$r/$(HOST_SUBDIR)/prev-gcc/gcc-ranlib$(exeext)
-B$$r/$(HOST_SUBDIR)/prev-gcc/
LTO_EXPORTS = AR="$(LTO_AR)"; export AR; \
RANLIB="$(LTO_RANLIB)"; export RANLIB;
LTO_FLAGS_TO_PASS = AR="$(LTO_AR)" RANLIB="$(LTO_RANLIB)"
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Subject: [Bug middle-end/85414] [8 Regression] ICE: in ix86_expand_prologue, at config/i386/i386.c:13810 with -Og -fgcse
Date: Tue, 17 Apr 2018 09:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85414
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Apr 17 09:16:48 2018
New Revision: 259433
URL: https://gcc.gnu.org/viewcvs?rev=259433&root=gcc&view=rev
Log:
PR middle-end/85414
* rtlhooks.c (gen_lowpart_if_possible): Don't call gen_lowpart_SUBREG
on a SUBREG.
* gcc.dg/pr85414.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr85414.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/rtlhooks.c
trunk/gcc/testsuite/ChangeLog
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From: "ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug go/85429] New: Several gotools tests FAIL with Solaris as
Date: Tue, 17 Apr 2018 09:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85429
Bug ID: 85429
Summary: Several gotools tests FAIL with Solaris as
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: go
Assignee: ian at airs dot com
Reporter: ro at gcc dot gnu.org
CC: cmang at google dot com
Target Milestone: ---
Target: *-*-solaris2.*
I noticed that several gotools tests FAIL when using Solaris as. E.g. on x86:
=== RUN TestGccgoCrashTracebackNodebug
--- FAIL: TestGccgoCrashTracebackNodebug (6.01s)
crash_test.go:55: building testprogcxx []: exit status 2
#
_/vol/gcc/src/hg/trunk/local/libgo/go/runtime/testdata/testprogcxx
Assembler:
"/var/tmp//ccPwSFPa.s", line 1 : Invalid section
attribute
"e" for SHF_EXCLUDE is only supported by gas, it seems. I don't know an
/bin/as
alternative
"/var/tmp//ccPwSFPa.s", line 8 : Syntax error
Near line: " .section .note.GNU-stack,"",@progbits"
"/var/tmp//ccPwSFPa.s", line 9 : Syntax error
Near line: " .section
.note.GNU-split-stack,"",@progbits"
as cannot handle - in section names, it seems, and provides no quoting
* On sparc, the situation is worse because the .section syntax differs:
# cmd/go/internal/str
/usr/ccs/bin/as: "/var/tmp//ccZPzx3b.s", line 6: error: quoted-string operand
required
/usr/ccs/bin/as: "/var/tmp//ccZPzx3b.s", line 13: error: invalid character
(0x40)
/usr/ccs/bin/as: "/var/tmp//ccZPzx3b.s", line 13: error: quoted-string operand
required
/usr/ccs/bin/as: "/var/tmp//ccZPzx3b.s", line 13: error: statement syntax
/usr/ccs/bin/as: "/var/tmp//ccZPzx3b.s", line 14: error: invalid character
(0x40)
/usr/ccs/bin/as: "/var/tmp//ccZPzx3b.s", line 14: error: quoted-string operand
required
/usr/ccs/bin/as: "/var/tmp//ccZPzx3b.s", line 14: error: statement syntax
I'm not sure about the buildid part, but there's probably no point in emitting
.note.GNU-stack and .note.GNU-split-stack on Solaris since nothing looks at
them anyway.
Rainer
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Subject: [Bug middle-end/85414] [8 Regression] ICE: in ix86_expand_prologue, at config/i386/i386.c:13810 with -Og -fgcse
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug ipa/85421] [8 regression] internal compiler error: in ipa_propagate_frequency, at ipa-profile.c:405
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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
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug c++/63579] New attribute for empty member optimization
Date: Tue, 17 Apr 2018 09:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63579
--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
The following was adopted for C++20
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0840r2.html
ABI description (not merged yet)
https://github.com/itanium-cxx-abi/cxx-abi/pull/50
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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85430] New: [7/8 Regression] ICE: SIGSEGV in memory_operand at recog.c:1358 with -O2 -fno-tree-ccp -fno-tree-fre
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85430
Bug ID: 85430
Summary: [7/8 Regression] ICE: SIGSEGV in memory_operand at
recog.c:1358 with -O2 -fno-tree-ccp -fno-tree-fre
Product: gcc
Version: 8.0.1
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Priority: P3
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Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 43959
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43959&action=edit
reduced testcase
This happens even with PR85193 fixed.
Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 -fno-tree-ccp -fno-tree-fre testcase.c
during RTL pass: sched2
testcase.c: In function 'foo':
testcase.c:8:1: internal compiler error: Segmentation fault
}
^
0xd6732f crash_signal
/repo/gcc-trunk/gcc/toplev.c:325
0xc8d044 memory_operand(rtx_def*, machine_mode)
/repo/gcc-trunk/gcc/recog.c:1358
0x12daa03 get_attr_memory(rtx_insn*)
/repo/gcc-trunk/gcc/config/i386/i386.md:2473
0x14f2310 insn_default_latency_generic(rtx_insn*)
/repo/gcc-trunk/gcc/config/i386/i386.md:16407
0x16fbbe1 insn_sched_cost(rtx_insn*)
/repo/gcc-trunk/gcc/haifa-sched.c:1420
0x17012e6 dep_cost_1(_dep*, unsigned int)
/repo/gcc-trunk/gcc/haifa-sched.c:1473
0x17032e9 dep_cost(_dep*)
/repo/gcc-trunk/gcc/haifa-sched.c:1509
0x17032e9 priority
/repo/gcc-trunk/gcc/haifa-sched.c:1660
0x17033de set_priorities(rtx_insn*, rtx_insn*)
/repo/gcc-trunk/gcc/haifa-sched.c:7122
0xcf85bd compute_priorities()
/repo/gcc-trunk/gcc/sched-rgn.c:3023
0xcfb995 schedule_region
/repo/gcc-trunk/gcc/sched-rgn.c:3116
0xcfb995 schedule_insns()
/repo/gcc-trunk/gcc/sched-rgn.c:3516
0xcfc1ed schedule_insns()
/repo/gcc-trunk/gcc/sched-rgn.c:3501
0xcfc1ed rest_of_handle_sched2
/repo/gcc-trunk/gcc/sched-rgn.c:3740
0xcfc1ed execute
/repo/gcc-trunk/gcc/sched-rgn.c:3876
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.
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-259430-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-259430-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
gcc version 8.0.1 20180417 (experimental) (GCC)
>From gcc-bugs-return-601783-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 10:05:58 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 target/85430] [7/8 Regression] ICE: SIGSEGV in memory_operand at recog.c:1358 with -O2 -fno-tree-ccp -fno-tree-fre
Date: Tue, 17 Apr 2018 10:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85430
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-17
CC| |jakub at gcc dot gnu.org
Target Milestone|--- |7.4
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r240006.
>From gcc-bugs-return-601784-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 10:17:37 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 target/85430] [7/8 Regression] ICE: SIGSEGV in memory_operand at recog.c:1358 with -O2 -fno-tree-ccp -fno-tree-fre
Date: Tue, 17 Apr 2018 10:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85430
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |uros at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This fixes it. Let me look for other similar issues.
--- gcc/config/i386/i386.md.jj 2018-04-05 20:34:31.989020754 +0200
+++ gcc/config/i386/i386.md 2018-04-17 12:14:19.550691464 +0200
@@ -10713,7 +10713,7 @@ (define_insn "*ashlqi3_1_slp"
{
switch (get_attr_type (insn))
{
- case TYPE_ALU:
+ case TYPE_ALU1:
gcc_assert (operands[1] == const1_rtx);
return "add{b}\t%0, %0";
@@ -10729,12 +10729,12 @@ (define_insn "*ashlqi3_1_slp"
(cond [(and (and (match_test "TARGET_DOUBLE_WITH_ADD")
(match_operand 0 "register_operand"))
(match_operand 1 "const1_operand"))
- (const_string "alu")
+ (const_string "alu1")
]
(const_string "ishift1")))
(set (attr "length_immediate")
(if_then_else
- (ior (eq_attr "type" "alu")
+ (ior (eq_attr "type" "alu1")
(and (eq_attr "type" "ishift1")
(and (match_operand 1 "const1_operand")
(ior (match_test "TARGET_SHIFT1")
>From gcc-bugs-return-601786-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 10:20:43 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85431] UBSAN: ../../gcc/dse.c:303:15: runtime error: shift exponent 64 is too large for 64-bit type 'long unsigned int'
Date: Tue, 17 Apr 2018 10:20:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|unknown |8.0.1
Blocks| |63426
Target Milestone|--- |8.0
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63426
[Bug 63426] [meta-bug] Issues found with -fsanitize=undefined
>From gcc-bugs-return-601785-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 10:20:05 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85431] New: UBSAN: ../../gcc/dse.c:303:15: runtime error: shift exponent 64 is too large for 64-bit type 'long unsigned int'
Date: Tue, 17 Apr 2018 10:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85431
Bug ID: 85431
Summary: UBSAN: ../../gcc/dse.c:303:15: runtime error: shift
exponent 64 is too large for 64-bit type 'long
unsigned int'
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: rsandifo at gcc dot gnu.org
Target Milestone: ---
Following causes UBSAN:
$ UBSAN_OPTIONS="print_stacktrace=1" ./xgcc -B.
/home/marxin/Programming/gcc/gcc/testsuite/c-c++-common/torture/pr85022.c -c -O
../../gcc/dse.c:303:15: runtime error: shift exponent 64 is too large for
64-bit type 'long unsigned int'
#0 0x2ecd348 in lowpart_bitmask ../../gcc/dse.c:303
#1 0x2ed2512 in record_store ../../gcc/dse.c:1649
#2 0x2ed89d4 in scan_insn ../../gcc/dse.c:2542
#3 0x2ed9251 in dse_step1 ../../gcc/dse.c:2657
#4 0x2eded20 in rest_of_handle_dse ../../gcc/dse.c:3574
#5 0x2edef5c in execute ../../gcc/dse.c:3632
#6 0x15a1a8b in execute_one_pass(opt_pass*) ../../gcc/passes.c:2497
#7 0x15a2255 in execute_pass_list_1 ../../gcc/passes.c:2586
#8 0x15a22cc in execute_pass_list_1 ../../gcc/passes.c:2587
#9 0x15a234c in execute_pass_list(function*, opt_pass*)
../../gcc/passes.c:2597
#10 0xc44bc3 in cgraph_node::expand() ../../gcc/cgraphunit.c:2139
#11 0xc45ad0 in expand_all_functions ../../gcc/cgraphunit.c:2275
#12 0xc47448 in symbol_table::compile() ../../gcc/cgraphunit.c:2624
#13 0xc479c9 in symbol_table::finalize_compilation_unit()
../../gcc/cgraphunit.c:2717
#14 0x18b1667 in compile_file ../../gcc/toplev.c:480
#15 0x18b5448 in do_compile ../../gcc/toplev.c:2132
#16 0x18b592c in toplev::main(int, char**) ../../gcc/toplev.c:2267
#17 0x320b531 in main ../../gcc/main.c:39
#18 0x7ffff5ca9a86 in __libc_start_main (/lib64/libc.so.6+0x21a86)
#19 0x8210c9 in _start
(/home/marxin/Programming/gcc/objdir2/gcc/cc1+0x8210c9)
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/84640] gcc/fortran/simplify.c:2587:9: runtime error: pointer index expression with base 0x0000090de160 overflowed to 0xffffffffc0632960
Date: Tue, 17 Apr 2018 10:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84640
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Can be easily seen with:
diff --git a/gcc/fortran/simplify.c b/gcc/fortran/simplify.c
index a970e017c90..66d9450d457 100644
--- a/gcc/fortran/simplify.c
+++ b/gcc/fortran/simplify.c
@@ -2171,7 +2171,9 @@ gfc_simplify_cshift (gfc_expr *array, gfc_expr *shift,
gfc_expr *dim)
while (count[n] == extent[n])
{
count[n] = 0;
+ fprintf (stderr, "p: %p, ss_ex[n]: %ld\n", rptr, ss_ex[n]);
rptr -= ss_ex[n];
+ fprintf (stderr, "p2: %p\n", rptr);
sptr -= ss_ex[n];
if (shiftvec)
hptr -= hs_ex[n];
Then:
$ ./gcc/xgcc -Bgcc
/home/marxin/Programming/gcc/gcc/testsuite/gfortran.dg/simplify_cshift_1.f90 -c
-O
p: 0x7824c48, ss_ex[n]: 433791696997
p2: 0xfffffcd807824920
p: 0x400000780db40, ss_ex[n]: 433791696997
p2: 0x3fcd80780d818
p: 0x40000078170e0, ss_ex[n]: 433791696997
p2: 0x3fcd807816db8
p: 0x4000007818be0, ss_ex[n]: 12
p2: 0x4000007818b80
p: 0x80781f5d0, ss_ex[n]: 126035584
p2: 0x7cb68c1d0
p: 0x10078216b0, ss_ex[n]: -1008
p2: 0x1007823630
p: 0x784b9a8, ss_ex[n]: 8589921888
p2: 0xfffffff0078646a8
So rptr points to an invalid memory. Question is whether a store/load from the
address can happen?
>From gcc-bugs-return-601788-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 10:55:40 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/84637] gcc/dbxout.c:684:14: runtime error: negation of -9223372036854775808 cannot be represented in type 'long int'; cast to an unsigned type to negate this value to itself
Date: Tue, 17 Apr 2018 10:55:00 -0000
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Thanks for explanation. Do you plan to remove it in the future from GCC or will
you leave it there unmaintained?
>From gcc-bugs-return-601789-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 11:19:06 2018
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85381] [og7, nvptx, openacc] parallel-loop-1.c fails with default vector length 128
Date: Tue, 17 Apr 2018 11:19:00 -0000
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--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #2)
> I minimized this failure, and ran into PR 80035/81069, so I've backported
> the fix from trunk: https://gcc.gnu.org/ml/gcc-patches/2018-04/msg00774.html
With that fixed, I run into another failure. Minimized:
...
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;
}
...
With ptx:
...
// BEGIN PREAMBLE
.version 3.1
.target sm_30
.address_size 64
// END PREAMBLE
// BEGIN FUNCTION DECL: main$_omp_fn$0
.entry main$_omp_fn$0;
// BEGIN FUNCTION DEF: main$_omp_fn$0
.entry main$_omp_fn$0
{
.reg .u64 %r23;
.reg .u64 %r24;
// fork 4;
bar.sync 0;
// forked 4;
// joining 4;
bar.sync 0;
// join 4;
ret;
}
//:FUNC_MAP "main$_omp_fn$0", 0x280, 0x1, 0x80
^@
...
Intriguing detail about this example: passes with GOMP_NVPTX_JIT=-O0, hangs
with GOMP_NVPTX_JIT=-O1, but seemingly the same SASS is generated:
...
//--------------------- .text.main$_omp_fn$0 --------------------------
.section .text.main$_omp_fn$0,"ax",@progbits
.sectionflags @"SHF_BARRIERS=1"
.sectioninfo @"SHI_REGISTERS=2"
.align 32
.text.main$_omp_fn$0:
.type main$_omp_fn$0,@function
.size main$_omp_fn$0,(.L_8 - main$_omp_fn$0)
.other main$_omp_fn$0,@"STO_CUDA_ENTRY STV_DEFAULT"
main$_omp_fn$0:
/*0008*/ MOV R1, c[0x0][0x20];
/*0010*/ BAR.SYNC 0x0;
/*0018*/ BAR.SYNC 0x0;
/*0028*/ EXIT;
.L_1:
/*0030*/ BRA `(.L_1);
.L_8:
...
The only difference is at 0020, but that's only visible with cuobjdump:
...
/*0010*/ BAR.SYNC 0x0; /* 0xf0a81b8000070000 */
/*0018*/ BAR.SYNC 0x0; /* 0xf0a81b8000070000 */
/* 0x001f8000ffe01fef */
/*0028*/ EXIT; /* 0xe30000000007000f */
...
vs
...
/*0010*/ BAR.SYNC 0x0; /* 0xf0a81b8000070000 */
/*0018*/ BAR.SYNC 0x0; /* 0xf0a81b8000070000 */
/* 0x001f8000ffe007ff */
/*0028*/ EXIT; /* 0xe30000000007000f */
...
>From gcc-bugs-return-601790-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 11:59:57 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
Date: Tue, 17 Apr 2018 11:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85391
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|marxin at gcc dot gnu.org |hubicka at gcc dot gnu.org
--- Comment #16 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jan Hubicka from comment #14)
> Created attachment 43947 [details]
> Proposed fix
>
> We looked into this with Maritn todday. There are two bugs: one is the fact
> that lto.c forgets to register the type in case it was within strongly
> connected component after its outer type. The order depends on hash values
> and is not well determined. We do not want to test TYPE_CANONICAL being
> non-NULL. Martin is testing it.
>
> Other is the fact that Eric's last change make odr types compatible when one
> of them is incomplete. This is not necessarily the case. The patch should
> fix the ordering issue by going the slow path in case type already in
> hashtable is incomplete. In this case it won't take long to compare it with
> the other type anyway.
Unfortunately with the suggested patch I see the same ICE for same types as
seen in: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85391#c1
Minimal test-case this time is 12 files, would take a really long time to
reduce.
>From gcc-bugs-return-601791-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 12:09:34 2018
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85417] -fcf-protection should provide CET protection on x86
Date: Tue, 17 Apr 2018 12:09:00 -0000
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--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Uroš Bizjak from comment #4)
> (In reply to H.J. Lu from comment #2)
> > I am working to enable CET on Linux with a single binary. -fcf-protection
> > should provide CET protection on x86 by default. We can add a command-line
> > option if we want a different implementation.
>
> This should remain an opt-in feature, not opt-out. We can have
> --with-fcf-protection configure option to override the default.
-fcf-protection -mcet can't be used with IFUNC features, like symbol
multiversioning or target clone since IBT/SHSTK are applied to the
whole program and they may be disabled in some functions. But
-fcf-protection can be implemented with the NOP portion of IBT/SHSTK,
which is compatible with all functions. Without this, IFUNC can't
be used on Linux when -fcf-protection is enabled by default.
>From gcc-bugs-return-601792-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 12:24:56 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/85432] New: Wodr can be more verbose for C code
Date: Tue, 17 Apr 2018 12:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85432
Bug ID: 85432
Summary: Wodr can be more verbose for C code
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
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Let's consider:
$ cat 1.c
struct A
{
int a;
double b;
};
extern void foo (struct A *);
int main()
{
struct A a;
foo (&a);
return a.a;
}
$ cat 2.c
struct A
{
int a;
};
void foo (struct A *a)
{
a->a = 123;
}
$ gcc *.c -flto
1.c:7:13: warning: type of ‘foo’ does not match original declaration
[-Wlto-type-mismatch]
extern void foo (struct A *);
^
2.c:7:6: note: ‘foo’ was previously declared here
void foo (struct A *a)
^
2.c:7:6: note: code may be misoptimized unless -fno-strict-aliasing is used
C++ FE is more verbose:
g++ *.c -flto
1.c:1:8: warning: type ‘struct A’ violates the C++ One Definition Rule [-Wodr]
struct A
^
2.c:1:8: note: a different type is defined in another translation unit
struct A
^
1.c:4:10: note: the first difference of corresponding definitions is field ‘b’
double b;
^
2.c:1:8: note: a type with different number of fields is defined in another
translation unit
struct A
^
1.c:7:13: warning: ‘foo’ violates the C++ One Definition Rule [-Wodr]
extern void foo (struct A *);
^
2.c:7:6: note: type mismatch in parameter 1
void foo (struct A *a)
^
2.c:1:8: note: type ‘struct A’ itself violates the C++ One Definition Rule
struct A
^
1.c:1:8: note: the incompatible type is defined here
struct A
^
2.c:7:6: note: ‘foo’ was previously declared here
void foo (struct A *a)
^
2.c:7:6: note: code may be misoptimized unless -fno-strict-aliasing is used
>From gcc-bugs-return-601793-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 12:25:12 2018
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Subject: [Bug lto/85432] Wodr can be more verbose for C code
Date: Tue, 17 Apr 2018 12:25:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|unknown |8.0.1
Severity|normal |enhancement
>From gcc-bugs-return-601794-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 12:26:13 2018
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Subject: [Bug c++/85428] constexpr pointer equality comparison not considered constant expression
Date: Tue, 17 Apr 2018 12:26:00 -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| |2018-04-17
Ever confirmed|0 |1
>From gcc-bugs-return-601795-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 12:27:00 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85433] New: -fdiagnostics-color=auto doesn't work properly with LTO
Date: Tue, 17 Apr 2018 12:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85433
Bug ID: 85433
Summary: -fdiagnostics-color=auto doesn't work properly with
LTO
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
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Running:
$ cat 1.c
struct A
{
int a;
double b;
};
extern void foo (struct A *);
int main()
{
struct A a;
foo (&a);
return a.a;
}
$ cat 2.c
struct A
{
int a;
};
$ gcc *.c -fdiagnostics-color=auto -flto
1.c:7:13: warning: type of ‘foo’ does not match original declaration
[-Wlto-type-mismatch]
extern void foo (struct A *);
^
2.c:7:6: note: ‘foo’ was previously declared here
void foo (struct A *a)
^
2.c:7:6: note: code may be misoptimized unless -fno-strict-aliasing is used
Does not produce color output, while:
$ gcc *.c -fdiagnostics-color=always -flto
does. David is it a known issue?
>From gcc-bugs-return-601796-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 12:30:55 2018
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Subject: [Bug c++/70248] constexpr initialization with unspecified equality expression accepted
Date: Tue, 17 Apr 2018 12:30:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
GCC trunk (8.0.1 20180410) now rejects comment 0 with:
c0.cc:4:24: error: a reinterpret_cast is not a constant expression
constexpr int A::*bx = (int(A::*))&B::x;
^~~~~~~~~~~~~
c0.cc:5:24: error: a reinterpret_cast is not a constant expression
constexpr int A::*cx = (int(A::*))&C::x;
^~~~~~~~~~~~~
>From gcc-bugs-return-601797-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 12:50:16 2018
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Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85416
Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
--- Comment #8 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Can you also run the tests under 'perf stat'?
>From gcc-bugs-return-601798-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 13:01:47 2018
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Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85416
--- Comment #9 from Martin Reinecke <martin@mpa-garching.mpg.de> ---
Sure!
martin@martin-Latitude-E7450 ~/tmp $ gcc -O3 testcase2.c -lm
martin@martin-Latitude-E7450 ~/tmp $ perf stat ./a.out
Performance counter stats for './a.out':
1109,985866 task-clock (msec) # 0,999 CPUs utilized
2 context-switches # 0,002 K/sec
0 cpu-migrations # 0,000 K/sec
2.000 page-faults # 0,002 M/sec
3.155.388.780 cycles # 2,843 GHz
6.717.336.961 instructions # 2,13 insn per cycle
979.526.022 branches # 882,467 M/sec
38.112 branch-misses # 0,00% of all branches
1,110639187 seconds time elapsed
martin@martin-Latitude-E7450 ~/tmp $ gcc -O3 testcase2.c -march=native -lm
martin@martin-Latitude-E7450 ~/tmp $ perf stat ./a.out
Performance counter stats for './a.out':
7724,004864 task-clock (msec) # 1,000 CPUs utilized
86 context-switches # 0,011 K/sec
1 cpu-migrations # 0,000 K/sec
2.004 page-faults # 0,259 K/sec
22.129.645.853 cycles # 2,865 GHz
6.723.657.441 instructions # 0,30 insn per cycle
980.761.202 branches # 126,976 M/sec
171.813 branch-misses # 0,02% of all branches
7,726058359 seconds time elapsed
>From gcc-bugs-return-601799-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 13:16:16 2018
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Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
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--- Comment #10 from Martin Liška <marxin at gcc dot gnu.org> ---
And please rebuild the binaries with -g and attach perf annotate output.
Thanks.
>From gcc-bugs-return-601800-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 13:20:18 2018
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Subject: [Bug target/85381] [og7, nvptx, openacc] parallel-loop-1.c fails with default vector length 128
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--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
This looks like a JIT bug, but with this tentative patch:
...
diff --git a/gcc/config/nvptx/nvptx.c b/gcc/config/nvptx/nvptx.c
index 8c478c874bd..ac394ee1ae6 100644
--- a/gcc/config/nvptx/nvptx.c
+++ b/gcc/config/nvptx/nvptx.c
@@ -4479,7 +4479,7 @@ nvptx_process_pars (parallel *par)
threads = nvptx_mach_vector_length ();
}
- if (!empty || !is_call)
+ if (!(empty || is_call))
{
/* Insert begin and end synchronizations. */
emit_insn_before (nvptx_cta_sync (barrier, threads),
...
no barriers are generated, and the minimized testcase passes.
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Subject: [Bug target/85381] [og7, nvptx, openacc] parallel-loop-1.c fails with default vector length 128
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--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #4)
> This looks like a JIT bug, but with this tentative patch:
...
> no barriers are generated, and the minimized testcase passes.
And the original test-case passes.
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Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
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--- Comment #11 from Martin Reinecke <martin@mpa-garching.mpg.de> ---
Created attachment 43960
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43960&action=edit
perf annotate output without -march=native
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Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
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--- Comment #12 from Martin Reinecke <martin@mpa-garching.mpg.de> ---
Created attachment 43961
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perf annotate output with -march=native
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Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
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--- Comment #13 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
This is most likely a variant of
https://bugzilla.redhat.com/show_bug.cgi?id=1421121
so hitting this bug requires a specific CPU model.
It looks as if SSE-AVX transition penalties appear when switching between
pure-SSE sinf code and VEX-prefixed SSE code in the main program after the
ld.so runtime resolver affects AVX state tracking in the CPU.
I'm not sure if any patches have landed on Glibc side to avoid this, but in any
case this should be re-reported against Glibc if needed, GCC cannot improve the
situation.
An easy workaround would be to pass -Wl,-z,now when linking.
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Subject: [Bug c/85433] -fdiagnostics-color=auto doesn't work properly with LTO
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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> ---
If you use -save-temps -v and rerun the lto1 invocation printed in there, it is
colored.
The way -fdiagnostics-color=auto works is it verifies TERM is not dumb and that
isatty (2).
The problem with LTO is that the latter is not the case, collect2 creates a
file
instead lderrout = make_temp_file (".le"); and uses that as stderr of the
linker which is what becomes stderr of lto1 too.
Dunno why we need to use files for there, if that is the case, perhaps either
collect2 or gcc driver should for -flto linking and -fdiagnostics-color=auto
(or if that is the default, for lack of -fdiagnostics-color too) check whether
the stderr is a terminal and if yes, pass -fdiagnostics-color=always instead.
>From gcc-bugs-return-601806-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 13:46:07 2018
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Subject: [Bug tree-optimization/85416] Massive performance regression when switching on "-march=native"
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |INVALID
--- Comment #14 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Ah, the linked report actually says very clearly that fixes landed in Glibc
2.25, so I'll close this bug: nothing to do on GCC side about this.
>From gcc-bugs-return-601807-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 13:54:26 2018
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Subject: [Bug libstdc++/71960] __glibcxx_assert and Debug Mode checks can't be used in constexpr functions
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-17
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
See patch and discussion at
https://gcc.gnu.org/ml/libstdc++/2018-03/msg00032.html and
https://gcc.gnu.org/ml/libstdc++/2018-03/msg00033.html
>From gcc-bugs-return-601808-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:01:01 2018
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Subject: [Bug target/85434] New: Address of stack protector guard spilled to stack on ARM
Date: Tue, 17 Apr 2018 14:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85434
Bug ID: 85434
Summary: Address of stack protector guard spilled to stack on
ARM
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: target
Assignee: thopre01 at gcc dot gnu.org
Reporter: thopre01 at gcc dot gnu.org
Target Milestone: ---
Target: arm-linux-gnueabihf
Created attachment 43962
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43962&action=edit
Testcase for stack protector spilling guard address
When compiling the attached file with -mcpu=cortex-a57 -std=c99 -Os -fpic
-fstack-protector-strong the address to the stack gets spilled on the stack
where an attacker using buffer overflow could overwrite it and thus control
what is the canari checked against:
ldr r3, [sp] <--- accessing spilled address of guard from stack
mov r0, r4
ldr r2, [sp, #228]
ldr r3, [r3]
cmp r2, r3
beq .L18
bl __stack_chk_fail(PLT)
I can reproduce this on GCC 7 and trunk at least.
>From gcc-bugs-return-601809-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:08:45 2018
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Subject: [Bug target/85434] Address of stack protector guard spilled to stack on ARM
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Thomas Preud'homme <thopre01 at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-04-17
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--- Comment #1 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
This is caused by missing stack_protect_set and stack_protect_test pattern in
ARM backend. It would be nice though if the address could be marked such that
it doesn't go on the stack to have the default implementation a bit more
robust. It might be worth having a warning if the override is not done as well.
>From gcc-bugs-return-601810-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:09:28 2018
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Subject: [Bug libstdc++/83077] sso-string @ gnu-versioned-namespace.
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|8.0 |9.0
>From gcc-bugs-return-601811-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:13:57 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/85435] New: undefined behaviour in std::char_traits<signed char>::move
Date: Tue, 17 Apr 2018 14:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85435
Bug ID: 85435
Summary: undefined behaviour in std::char_traits<signed
char>::move
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
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#include <string>
int main()
{
std::char_traits<signed char>::move(nullptr, nullptr, 0);
}
Compiled with UBsan shows:
/home/jwakely/gcc/8/include/c++/8.0.1/bits/char_traits.h:188:52: runtime error:
null pointer passed as argument 1, which is declared to never be null
/home/jwakely/gcc/8/include/c++/8.0.1/bits/char_traits.h:188:52: runtime error:
null pointer passed as argument 2, which is declared to never be null
The move member for the primary template needs this fix:
--- a/libstdc++-v3/include/bits/char_traits.h
+++ b/libstdc++-v3/include/bits/char_traits.h
@@ -185,6 +185,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
char_traits<_CharT>::
move(char_type* __s1, const char_type* __s2, std::size_t __n)
{
+ if (__n == 0)
+ return __s1;
return static_cast<_CharT*>(__builtin_memmove(__s1, __s2,
__n * sizeof(char_type)));
}
>From gcc-bugs-return-601812-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:15:35 2018
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Subject: [Bug libstdc++/85435] undefined behaviour in std::char_traits<signed char>::move
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-17
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=65049
Ever confirmed|0 |1
>From gcc-bugs-return-601813-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:21:42 2018
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Subject: [Bug libstdc++/84442] FAIL: 30_threads/thread/cons/terminate.cc (test for excess errors)
Date: Tue, 17 Apr 2018 14:21:00 -0000
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Dave, does the patch in comment 3 fix the FAIL?
>From gcc-bugs-return-601815-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:27:37 2018
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Subject: [Bug target/85436] New: [7 Regression] ICE compiling go code with -mcpu=power9
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85436
Bug ID: 85436
Summary: [7 Regression] ICE compiling go code with -mcpu=power9
Product: gcc
Version: 7.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: acsawdey at gcc dot gnu.org
CC: bergner at gcc dot gnu.org, segher at gcc dot gnu.org,
wschmidt at gcc dot gnu.org
Target Milestone: ---
Target: powerpc64le-linux-gnu
Created attachment 43964
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43964&action=edit
reduced test case
To reproduce:
Build gcc-7-branch using:
configure --disable-bootstrap --enable-languages=c,c++,go
--with-long-double-128 --enable-secureplt --disable-multilib --without-ppl
--without-cloog --without-libelf
gcc/gccgo -Bgcc -O3 -Lpowerpc64le-linux-gnu/libgo -S bug_reduced.go
-mcpu=power9
This affects 259009 through the head of the gcc-7-branch.
>From gcc-bugs-return-601814-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:27:21 2018
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Subject: [Bug debug/84637] gcc/dbxout.c:684:14: runtime error: negation of -9223372036854775808 cannot be represented in type 'long int'; cast to an unsigned type to negate this value to itself
Date: Tue, 17 Apr 2018 14:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84637
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43963
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43963&action=edit
gcc8-pr84637.patch
I think in this case the fix is rather obvious (though, untested so far and not
proposing it for GCC8).
>From gcc-bugs-return-601816-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:37:47 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/70248] constexpr initialization with unspecified equality expression accepted
Date: Tue, 17 Apr 2018 14:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70248
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Rejecting the test case because of the initialization is a regression. The
cast is not a reinterpret cast. GCC gives the same error with a static cast
too:
$ gcc -S -Wall pr70248.C
pr70248.C:4:24: error: a reinterpret_cast is not a constant expression
constexpr int A::*bx = static_cast<int(A::*)>(&B::x);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pr70248.C:5:24: error: a reinterpret_cast is not a constant expression
constexpr int A::*cx = static_cast<int(A::*)>(&C::x);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>From gcc-bugs-return-601817-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:53:56 2018
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Subject: [Bug c++/70248] constexpr initialization with unspecified equality expression accepted
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70248
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |jason at gcc dot gnu.org
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That started with r249088.
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85437] New: [8 Regression] member pointer static upcast rejected in a constexpr context
Date: Tue, 17 Apr 2018 14:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85437
Bug ID: 85437
Summary: [8 Regression] member pointer static upcast rejected
in a constexpr context
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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The following valid test case (extracted from bug 70248) is accepted by GCC 7
(and Clang and ICC) but rejected by GCC 8:
$ cat pr70248.C && gcc -S -Wall pr70248.C
struct A {};
struct B : A { int x; };
constexpr int A::*bx = static_cast<int(A::*)>(&B::x);
pr70248.C:4:24: error: a reinterpret_cast is not a constant expression
constexpr int A::*bx = static_cast<int(A::*)>(&B::x);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>From gcc-bugs-return-601819-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:55:44 2018
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Subject: [Bug c++/70248] constexpr initialization with unspecified equality expression accepted
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=85437
--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
I raised bug 85437 for the regression.
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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++/85438] New: [8 Regression] invalid "a reinterpret_cast is not a constant expression" diagnostics since r249088
Date: Tue, 17 Apr 2018 14:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85438
Bug ID: 85438
Summary: [8 Regression] invalid "a reinterpret_cast is not a
constant expression" diagnostics since r249088
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: accepts-invalid
Severity: minor
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jakub at gcc dot gnu.org
CC: daniel.kruegler at googlemail dot com, jakub at gcc dot gnu.org,
jason at gcc dot gnu.org, msebor at gcc dot gnu.org,
unassigned at gcc dot gnu.org, webrown.cpp at gmail dot com
Depends on: 70248
Blocks: 55004
Target Milestone: ---
+++ This bug was initially created as a clone of Bug #70248 +++
struct A {};
struct B : A { int x; };
constexpr int A::*bx = (int(A::*))&B::x;
is rejected since r249088 with:
pr70248-2.C:3:24: error: a reinterpret_cast is not a constant expression
constexpr int A::*bx = (int(A::*))&B::x;
^~~~~~~~~~~~~
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004
[Bug 55004] [meta-bug] constexpr issues
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70248
[Bug 70248] constexpr initialization with unspecified equality expression
accepted
>From gcc-bugs-return-601822-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:56:39 2018
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Subject: [Bug c++/85438] [8 Regression] invalid "a reinterpret_cast is not a constant expression" diagnostics since r249088
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|accepts-invalid |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-17
Target Milestone|--- |8.0
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
clang++ and older g++ accept it.
>From gcc-bugs-return-601821-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:56:36 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85437] [8 Regression] member pointer static upcast rejected in a constexpr context
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
The first revision to reject the test case is r249088:
Overhaul pointer-to-member conversion and template argument handling.
* call.c (standard_conversion): Avoid creating ck_pmem when the
class type is the same.
* cvt.c (can_convert_qual): Split from
perform_qualification_conversions.
* constexpr.c (cxx_eval_constant_expression): Check it.
* typeck.c (convert_ptrmem): Only cplus_expand_constant if
adjustment is necessary.
* pt.c (check_valid_ptrmem_cst_expr): Compare class types.
(convert_nontype_argument): Avoid redundant error.
>From gcc-bugs-return-601823-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 14:58:43 2018
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Subject: [Bug c++/85437] [8 Regression] member pointer static upcast rejected in a constexpr context
Date: Tue, 17 Apr 2018 14:58:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-601824-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 15:01:48 2018
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Subject: [Bug c++/85438] [8 Regression] invalid "a reinterpret_cast is not a constant expression" diagnostics since r249088
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |RESOLVED
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
There is one NOP_EXPR created by
*** This bug has been marked as a duplicate of bug 85437 ***
>From gcc-bugs-return-601825-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 15:01:50 2018
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Subject: [Bug c++/55004] [meta-bug] constexpr issues
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Bug 55004 depends on bug 85438, which changed state.
Bug 85438 Summary: [8 Regression] invalid "a reinterpret_cast is not a constant expression" diagnostics since r249088
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85438
What |Removed |Added
----------------------------------------------------------------------------
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>From gcc-bugs-return-601826-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 15:01:54 2018
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Subject: [Bug c++/85437] [8 Regression] member pointer static upcast rejected in a constexpr context
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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> ---
*** Bug 85438 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-601827-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 15:07:52 2018
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Subject: [Bug c++/85437] [8 Regression] member pointer static upcast rejected in a constexpr context
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
convert_ptrmem here creates a NOP_EXPR around the PTRMEM_CST, even when it is
for a static cast rather than reinterpret_cast. The OFFSET_TYPEs are
different, but they have the same TREE_TYPE etc.
Then constexpr.c doesn't consider that cast to be usable in constant
expressions and because it is called with allow_non_constant, it wraps the new
PTRMEM_CST with another NOP_EXPR and that is where following constexpr.c call
errors on.
>From gcc-bugs-return-601828-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 15:10:50 2018
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Subject: [Bug c++/85437] [8 Regression] member pointer static upcast rejected in a constexpr context
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org
Target Milestone|--- |8.0
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(gdb) p debug_tree (type)
<offset_type 0x7fffefd9d150
type <integer_type 0x7fffefc625e8 int public type_6 SI
size <integer_cst 0x7fffefc650c0 constant 32>
unit-size <integer_cst 0x7fffefc650d8 constant 4>
align:32 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7fffefc625e8 precision:32 min <integer_cst 0x7fffefc65078 -2147483648> max
<integer_cst 0x7fffefc65090 2147483647>
pointer_to_this <pointer_type 0x7fffefc6aa80>>
DI
size <integer_cst 0x7fffefc45e70 type <integer_type 0x7fffefc620a8
bitsizetype> constant 64>
unit-size <integer_cst 0x7fffefc45e88 type <integer_type 0x7fffefc62000
sizetype> constant 8>
align:64 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7fffefd9d150 basetype <record_type 0x7fffefd88150 A>>
$4 = void
(gdb) p debug_tree (op->typed.type)
<offset_type 0x7fffefd9d3f0
type <integer_type 0x7fffefc625e8 int public type_6 SI
size <integer_cst 0x7fffefc650c0 constant 32>
unit-size <integer_cst 0x7fffefc650d8 constant 4>
align:32 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7fffefc625e8 precision:32 min <integer_cst 0x7fffefc65078 -2147483648> max
<integer_cst 0x7fffefc65090 2147483647>
pointer_to_this <pointer_type 0x7fffefc6aa80>>
DI
size <integer_cst 0x7fffefc45e70 type <integer_type 0x7fffefc620a8
bitsizetype> constant 64>
unit-size <integer_cst 0x7fffefc45e88 type <integer_type 0x7fffefc62000
sizetype> constant 8>
align:64 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7fffefd9d3f0 basetype <record_type 0x7fffefd889d8 B>>
Ah, one has basetype A, the other B, and both:
4600 if (same_type_ignoring_top_level_qualifiers_p (type,
4601 TREE_TYPE
(op))
4602 || can_convert_qual (type, op))
tests fail in this case.
>From gcc-bugs-return-601829-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 15:16:51 2018
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Subject: [Bug libstdc++/85435] undefined behaviour in std::char_traits<signed char>::move
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This isn't important to fix just because ubsan will be happy, but the
optimizers actively derive non-NULL range for the pointers from the memmove
call and so could optimize away say comparisons against NULL of those pointers
etc.
So, if it is valid for the move method on char_traits to be called with NULL,
the fix is very important.
>From gcc-bugs-return-601830-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 15:22:45 2018
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Subject: [Bug lto/82229] GCC7's LTO underperforms compared to GCC6
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--- Comment #22 from krzysio.kurek at wp dot pl ---
I'm sorry but profiling doesn't seem to be well documented, what tools should I
use to generate a profiling log?
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Subject: [Bug target/85203] cmse_nonsecure_caller intrinsic returns incorrect results
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Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |ramana at gcc dot gnu.org
Resolution|--- |FIXED
Target Milestone|--- |7.4
--- Comment #4 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
Fixed I'm assuming ?
>From gcc-bugs-return-601832-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 15:36:17 2018
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Subject: [Bug ada/85380] gnatbind fails with small executable & restricted runtime
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Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:
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| |ramana at gcc dot gnu.org
--- Comment #1 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
Adding Eric to the CC list as someone who could comment on this ?
>From gcc-bugs-return-601833-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 15:36:30 2018
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Subject: [Bug target/85434] Address of stack protector guard spilled to stack on ARM
Date: Tue, 17 Apr 2018 15:36:00 -0000
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--- Comment #2 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
(In reply to Thomas Preud'homme from comment #1)
> This is caused by missing stack_protect_set and stack_protect_test pattern
> in ARM backend. It would be nice though if the address could be marked such
> that it doesn't go on the stack to have the default implementation a bit
> more robust. It might be worth having a warning if the override is not done
> as well.
Nope sorry, the address is put in a register before the test pattern is called.
>From gcc-bugs-return-601834-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 15:58:18 2018
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Subject: [Bug rtl-optimization/85431] UBSAN: ../../gcc/dse.c:303:15: runtime error: shift exponent 64 is too large for 64-bit type 'long unsigned int'
Date: Tue, 17 Apr 2018 15:58:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-04-17
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43965
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43965&action=edit
gcc8-pr85421.patch
Untested fix.
>From gcc-bugs-return-601835-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 16:02:22 2018
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Subject: [Bug target/85436] [7 Regression] ICE compiling go code with -mcpu=power9
Date: Tue, 17 Apr 2018 16:02:00 -0000
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--- Comment #1 from acsawdey at gcc dot gnu.org ---
Created attachment 43966
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shorter reduced test case
I've further reduced the test case and now it's only 38 lines so so should be
easier to work with.
>From gcc-bugs-return-601836-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 16:11:28 2018
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Subject: [Bug libstdc++/85435] undefined behaviour in std::char_traits<signed char>::move
Date: Tue, 17 Apr 2018 16:11:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The library will never call it with a null pointer, but users could do. Not
many people use char_traits directly though. Probably even fewer use the
primary template, because there are specializations for char, wchar_t, char16_t
and char32_t which were already fixed for PR 65049.
>From gcc-bugs-return-601837-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 16:16:41 2018
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From: "foddex at foddex dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/85439] New: mt19937_64 producing unexpected result only in certain configuration
Date: Tue, 17 Apr 2018 16:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85439
Bug ID: 85439
Summary: mt19937_64 producing unexpected result only in certain
configuration
Product: gcc
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Created attachment 43967
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Code mentioned in report
My sincere apologies if this doesn't belong here, I'm not a regular.
In my tests to establish STL's mersenne twister's reproducability, I have found
an interesting problem that I think is a bug in the libstdc++ runtime in Linux,
but I may be wrong.
I ran the attached code on the various platforms and compiler combinations:
LINUX:
- g++ version 7.3.1 20180130 (Red Hat 7.3.1-2) on Fedora 26 4.12.14-300
- clang++ version 4.0.1 (tags/RELEASE_401/final) on Fedora 26 4.12.14-300
- clang++ version 6.0.0 (tags/RELEASE_600/final) on Arch Linux 4.15.13-1
OSX:
- clang++ 9.1.0 Apple LLVM on High Sierra
WINDOWS:
- MSVC2017 15.6.6 on Windows 10
For g++ and clang++ the compilations options are identical on all platforms:
main.cpp -std=c++11
On MSVC a default solution was used.
The output on Linux is as follows:
32 bits gen, uint32_t: 3499211612
32 bits gen, uint64_t: 15028999435905310454
64 bits gen, uint32_t: 3379370269
64 bits gen, uint64_t: 14514284786278117030
32 bits gen, float: 0.814724
64 bits gen, float: 0.786821
32 bits gen, double: 0.135477
64 bits gen, double: 0.786821
The output of the clang++ on OS X and MSVC applications is as follows:
32 bits gen, uint32_t: 3499211612
32 bits gen, uint64_t: 15028999435905310454
64 bits gen, uint32_t: 4143361702
64 bits gen, uint64_t: 14514284786278117030
32 bits gen, float: 0.814724
64 bits gen, float: 0.786821
32 bits gen, double: 0.135477
64 bits gen, double: 0.786821
Note that the output only differs on the 3rd line.
Since MSVC and clang agree on all tests, and their implementations are
independent, I came to the conclusion it must be a bug in libstd++ on Linux.
>From gcc-bugs-return-601838-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 16:35:36 2018
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From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug testsuite/85326] `make check` fails with `--disable-bootstrap` and `--enable-languages=c`
Date: Tue, 17 Apr 2018 16:35:00 -0000
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--- Comment #6 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Tue Apr 17 16:34:56 2018
New Revision: 259435
URL: https://gcc.gnu.org/viewcvs?rev=259435&root=gcc&view=rev
Log:
[AArch64/arm] PR testsuite/85326 Avoid C++ tests when C++ compiler not present
PR testsuite/85326
* gcc.target/arm/pr54300.C: Move to...
* g++.dg/other/pr54300.C: ... Here. Add target directives.
* gcc.target/arm/pr55073.C: Move to...
* g++.dg/other/pr55073.C: ... Here. Add target directives.
* gcc.target/arm/pr56184.C: Move to...
* g++.dg/other/pr56184.C: ... Here. Add target directives.
* gcc.target/arm/pr59985.C: Move to...
* g++.dg/other/pr59985.C: ... Here. Add target directives.
* gcc.target/aarch64/pr60675.C: Move to...
* g++.dg/other/pr60675.C: ... Here. Add target directives.
* gcc.target/aarch64/pr81422.C: Move to...
* g++.dg/other/pr81422.C: ... Here. Add target directives.
* gcc.target/aarch64/sve/const_pred_1.C: Move to...
* g++.dg/other/sve_const_pred_1.C: ... Here. Add target directives.
* gcc.target/aarch64/sve/const_pred_2.C: Move to...
* g++.dg/other/sve_const_pred_2.C: ... Here. Add target directives.
* gcc.target/aarch64/sve/const_pred_3.C: Move to...
* g++.dg/other/sve_const_pred_3.C: ... Here. Add target directives.
* gcc.target/aarch64/sve/const_pred_4.C: Move to...
* g++.dg/other/sve_const_pred_4.C: ... Here. Add target directives.
* gcc.target/aarch64/sve/tls_2.C: Move to...
* g++.dg/other/sve_tls_2.C: ... Here. Add target directives.
* gcc.target/aarch64/pr81414.C: Rename to...
* gcc.target/aarch64/pr81414.c: ... This.
* gcc.target/aarch64/simd/pr67896.C: Rename to...
* gcc.target/aarch64/simd/pr67896.c: ... This. Update error expected
messages.
* gcc.target/aarch64/sve/vcond_1.C: Rename to...
* gcc.target/aarch64/sve/vcond_1.c: ... This. Avoid use of stdint.h.
* gcc.target/aarch64/sve/vcond_1_run.C: Rename to...
* gcc.target/aarch64/sve/vcond_1_run.c: ... This. Update include
file name.
Added:
trunk/gcc/testsuite/g++.dg/other/pr54300.C
- copied, changed from r259434,
trunk/gcc/testsuite/gcc.target/arm/pr54300.C
trunk/gcc/testsuite/g++.dg/other/pr55073.C
- copied, changed from r259434,
trunk/gcc/testsuite/gcc.target/arm/pr55073.C
trunk/gcc/testsuite/g++.dg/other/pr56184.C
- copied, changed from r259434,
trunk/gcc/testsuite/gcc.target/arm/pr56184.C
trunk/gcc/testsuite/g++.dg/other/pr59985.C
- copied, changed from r259434,
trunk/gcc/testsuite/gcc.target/arm/pr59985.C
trunk/gcc/testsuite/g++.dg/other/pr60675.C
- copied, changed from r259434,
trunk/gcc/testsuite/gcc.target/aarch64/pr60675.C
trunk/gcc/testsuite/g++.dg/other/pr81422.C
- copied unchanged from r259434,
trunk/gcc/testsuite/gcc.target/aarch64/pr81422.C
trunk/gcc/testsuite/g++.dg/other/sve_const_pred_1.C
- copied, changed from r259434,
trunk/gcc/testsuite/gcc.target/aarch64/sve/const_pred_1.C
trunk/gcc/testsuite/g++.dg/other/sve_const_pred_2.C
- copied, changed from r259434,
trunk/gcc/testsuite/gcc.target/aarch64/sve/const_pred_2.C
trunk/gcc/testsuite/g++.dg/other/sve_const_pred_3.C
- copied, changed from r259434,
trunk/gcc/testsuite/gcc.target/aarch64/sve/const_pred_3.C
trunk/gcc/testsuite/g++.dg/other/sve_const_pred_4.C
- copied, changed from r259434,
trunk/gcc/testsuite/gcc.target/aarch64/sve/const_pred_4.C
trunk/gcc/testsuite/g++.dg/other/sve_tls_2.C
- copied, changed from r259434,
trunk/gcc/testsuite/gcc.target/aarch64/sve/tls_2.C
trunk/gcc/testsuite/gcc.target/aarch64/pr81414.c
- copied unchanged from r259434,
trunk/gcc/testsuite/gcc.target/aarch64/pr81414.C
trunk/gcc/testsuite/gcc.target/aarch64/simd/pr67896.c
Removed:
trunk/gcc/testsuite/gcc.target/aarch64/pr60675.C
trunk/gcc/testsuite/gcc.target/aarch64/pr81414.C
trunk/gcc/testsuite/gcc.target/aarch64/pr81422.C
trunk/gcc/testsuite/gcc.target/aarch64/simd/pr67896.C
trunk/gcc/testsuite/gcc.target/aarch64/sve/const_pred_1.C
trunk/gcc/testsuite/gcc.target/aarch64/sve/const_pred_2.C
trunk/gcc/testsuite/gcc.target/aarch64/sve/const_pred_3.C
trunk/gcc/testsuite/gcc.target/aarch64/sve/const_pred_4.C
trunk/gcc/testsuite/gcc.target/aarch64/sve/tls_2.C
trunk/gcc/testsuite/gcc.target/arm/pr54300.C
trunk/gcc/testsuite/gcc.target/arm/pr55073.C
trunk/gcc/testsuite/gcc.target/arm/pr56184.C
trunk/gcc/testsuite/gcc.target/arm/pr59985.C
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/aarch64/sve/vcond_1.C
trunk/gcc/testsuite/gcc.target/aarch64/sve/vcond_1_run.C
>From gcc-bugs-return-601839-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 17:01:18 2018
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/85440] New: libquadmath and quadmath.h do not exist on ppc64
Date: Tue, 17 Apr 2018 17:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85440
Bug ID: 85440
Summary: libquadmath and quadmath.h do not exist on ppc64
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libquadmath
Assignee: unassigned at gcc dot gnu.org
Reporter: dclarke at blastwave dot org
Target Milestone: ---
Seems fairly clear that while the info file does get installed
into share/info/libquadmath.info the actual lib and header do
not exist.
Could be bug 55821 here again.
You can see the testsuite report at :
https://gcc.gnu.org/ml/gcc-testresults/2018-04/msg01351.html
The ramifications here seem to be that one can not compile much of
anything that uses the new 128-bit IEEE 754-2008 datatypes on this
platform and any attempt to do so results in :
foo.c:3:10: fatal error: quadmath.h: No such file or directory
#include <quadmath.h>
^~~~~~~~~~~~
compilation terminated.
Any attempt to use the -mabi=ieeelongdouble option results in horrific
results that are no where even remotely close to correct :
nix$ cat ld.c
#define _XOPEN_SOURCE 600
#include <stdio.h>
#include <stdlib.h>
int main ( int argc, char *argv[] ) {
int j;
/* correct 128 bit big endian hex representation of pi is
* 0x40 00 92 1f b5 44 42 d1 84 69 89 8c c5 17 01 b8 */
long double pi = 3.14159265358979323846264338327950288419716939937510L;
printf("\nstack address of variable \"pi\" is %p\n", &pi );
printf("\ncontents : 0x" );
for ( j=0; j<sizeof(long double); j++ )
printf("%02x ", ((unsigned char *)&pi)[j] );
printf("\n" );
printf("%+42.38Lf\n", pi );
printf(" +3.1415926535897932384626433832795028841971 <- pi\n" );
return (EXIT_SUCCESS);
}
nix$
nix$ /usr/local/gcc7/bin/gcc -m64 -g -Wl,-rpath=/usr/local/lib -mcpu=970
-maltivec -mfull-toc -mregnames -mabi=ieeelongdouble -o ld ld.c
gcc: warning: using IEEE extended precision long double
cc1: warning: using IEEE extended precision long double
nix$ ./ld
stack address of variable "pi" is 0x7ffffa5fb8c0
contents : 0x40 00 92 1f b5 44 42 d1 84 69 89 8c c5 17 01 b8
+2.07134954084936184770526779175270348787
+3.1415926535897932384626433832795028841971 <- pi
nix$
We can see the obvious error from printf here as well as the
two different representations in the assembly from the use of
the -mabi=ieeelongdouble versus the -mabi=ibmlongdouble :
nix$
nix$ /usr/local/gcc7/bin/gcc -m64 -g -Wl,-rpath=/usr/local/lib -mcpu=970
-maltivec -mfull-toc -mregnames -mabi=ibmlongdouble -S -o ld.s ld.c ; grep
"quad" ld.s | grep "0x"
gcc: warning: using IBM extended precision long double
cc1: warning: using IBM extended precision long double
.quad 0x400921fb54442d18,0x3ca1a62633145c06
nix$
nix$ /usr/local/gcc7/bin/gcc -m64 -g -Wl,-rpath=/usr/local/lib -mcpu=970
-maltivec -mfull-toc -mregnames -mabi=ieeelongdouble -S -o ld.s ld.c ; grep
"quad" ld.s | grep "0x"
gcc: warning: using IEEE extended precision long double
cc1: warning: using IEEE extended precision long double
.quad 0x4000921fb54442d1,0x8469898cc51701b8
nix$
One of those is clearly correct and the other clearly wrong.
libquadmath was designed to address these sort of cross platform
bizarre issues and gnu libc has implementations for various issues.
Is the real problem gnu libc ?
The GNU C Library version 2.26 is now available
https://sourceware.org/ml/libc-alpha/2017-08/msg00010.html
The GNU C Library version 2.27 is now available
https://sourceware.org/ml/libc-announce/2018/msg00000.html
Or perhaps non-IBM Power variations are simply not supported?
>From gcc-bugs-return-601840-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 17:02:10 2018
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Subject: [Bug target/85430] [7/8 Regression] ICE: SIGSEGV in memory_operand at recog.c:1358 with -O2 -fno-tree-ccp -fno-tree-fre
Date: Tue, 17 Apr 2018 17:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85430
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Apr 17 17:01:31 2018
New Revision: 259436
URL: https://gcc.gnu.org/viewcvs?rev=259436&root=gcc&view=rev
Log:
PR target/85430
* config/i386/i386.md (*ashlqi3_1_slp): Use alu1 type instead of alu.
* gcc.dg/pr85430.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr85430.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.md
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-601842-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 17:07:39 2018
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From: "thopre01 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85434] Address of stack protector guard spilled to stack on ARM
Date: Tue, 17 Apr 2018 17:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85434
--- Comment #3 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
(In reply to Thomas Preud'homme from comment #2)
> (In reply to Thomas Preud'homme from comment #1)
> > This is caused by missing stack_protect_set and stack_protect_test pattern
> > in ARM backend. It would be nice though if the address could be marked such
> > that it doesn't go on the stack to have the default implementation a bit
> > more robust. It might be worth having a warning if the override is not done
> > as well.
>
> Nope sorry, the address is put in a register before the test pattern is
> called.
This happens when expanding the tree that holds the guard's address. It's a
symbol_ref for which the default expand code of loading into a register is
used. This happens also for AArch64 and I suspect for x86 as well.
What makes it worse on ARM is that cse_local sees 2 SET instructions computing
the address of the guard and reuse the register being set in the first
instruction instead of recomputing again. Because of the distance between that
first SET and the comparison between guard and canari the chances of getting
the address spilled are higher. This does not happen for AArch64 because the
mov of symbol_ref generates an UNSPEC of a memory address whereas ARM generates
a MEM of an UNSPEC symbol_ref. However I suppose with scheduling it's possible
for the set of guard address and following test of guard against canari to be
moved apart and spill to happen in theory.
My feeling is that the target patterns should also do the address computation,
ie stack_protect_set and stack_protect_test would take that MEM of symbol_ref
instead of expanding it first.
Thoughts?
>From gcc-bugs-return-601841-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 17:07:18 2018
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Subject: [Bug testsuite/85326] `make check` fails with `--disable-bootstrap` and `--enable-languages=c`
Date: Tue, 17 Apr 2018 17:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85326
--- Comment #7 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Tue Apr 17 17:06:36 2018
New Revision: 259437
URL: https://gcc.gnu.org/viewcvs?rev=259437&root=gcc&view=rev
Log:
PR testsuite/85326
Commit missing hunk from r259435.
Added:
trunk/gcc/testsuite/gcc.target/aarch64/sve/vcond_1.c
- copied unchanged from r259435,
trunk/gcc/testsuite/gcc.target/aarch64/sve/vcond_1.C
trunk/gcc/testsuite/gcc.target/aarch64/sve/vcond_1_run.c
- copied unchanged from r259435,
trunk/gcc/testsuite/gcc.target/aarch64/sve/vcond_1_run.C
Removed:
trunk/gcc/testsuite/gcc.target/aarch64/sve/vcond_1.C
trunk/gcc/testsuite/gcc.target/aarch64/sve/vcond_1_run.C
>From gcc-bugs-return-601843-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 17:24:01 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 lto/85422] [openacc] ICE at cfgloop.c:468: segfault in flow_loops_find
Date: Tue, 17 Apr 2018 17:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85422
Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |6.4.0, 7.3.0
--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Reproduces with gcc-6-branch and gcc-7-branch.
>From gcc-bugs-return-601844-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 17:37:19 2018
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Subject: [Bug c++/85441] New: Empty loops not optimised away
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85441
Bug ID: 85441
Summary: Empty loops not optimised away
Product: gcc
Version: 7.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sebastian321123 at interia dot pl
Target Milestone: ---
This code compiles for a long time and has high memory usage (roughly 2GiB). I
suspect that empty loops are not removed.
Code:
constexpr double foo(const unsigned int N) {
for (unsigned int i = 0; i != N; ++i) {
for (unsigned int i = 0; i != N; ++i) {
}
}
return 7;
}
int main() {
return foo(4393u);
}
Command line:
$ time env g++ -v --std=c++14 foo.cpp -o foo
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --enable-multilib --disable-werror
--enable-checking=release --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 7.3.1 20180312 (GCC)
COLLECT_GCC_OPTIONS='-v' '-std=c++14' '-o' 'foo' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/cc1plus -quiet -v -D_GNU_SOURCE foo.cpp
-quiet -dumpbase foo.cpp -mtune=generic -march=x86-64 -auxbase foo -std=c++14
-version -o /tmp/cc3hVZ3b.s
GNU C++14 (GCC) version 7.3.1 20180312 (x86_64-pc-linux-gnu)
compiled by GNU C version 7.3.1 20180312, GMP version 6.1.2, MPFR
version 4.0.1, MPC version 1.1.0, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../include/c++/7.3.1
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../include/c++/7.3.1/x86_64-pc-linux-gnu
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../include/c++/7.3.1/backward
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/include
/usr/local/include
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/include-fixed
/usr/include
End of search list.
GNU C++14 (GCC) version 7.3.1 20180312 (x86_64-pc-linux-gnu)
compiled by GNU C version 7.3.1 20180312, GMP version 6.1.2, MPFR
version 4.0.1, MPC version 1.1.0, isl version isl-0.18-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 3fb60f63f2e4dccab1b015b716b8b627
COLLECT_GCC_OPTIONS='-v' '-std=c++14' '-o' 'foo' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
as -v --64 -o /tmp/ccO93I4M.o /tmp/cc3hVZ3b.s
GNU assembler version 2.29.1 (x86_64-pc-linux-gnu) using BFD version (GNU
Binutils) 2.29.1
COMPILER_PATH=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/:/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/:/usr/lib/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/:/usr/lib/gcc/x86_64-pc-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/:/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../lib/:/lib/../lib/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-std=c++14' '-o' 'foo' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/collect2 -plugin
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/lto-wrapper
-plugin-opt=-fresolution=/tmp/cckfgL6n.res -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc --build-id
--eh-frame-hdr --hash-style=gnu -m elf_x86_64 -dynamic-linker
/lib64/ld-linux-x86-64.so.2 -pie -o foo
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../lib/Scrt1.o
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../lib/crti.o
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/crtbeginS.o
-L/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1
-L/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../lib -L/lib/../lib
-L/usr/lib/../lib -L/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../..
/tmp/ccO93I4M.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/crtendS.o
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.1/../../../../lib/crtn.o
COLLECT_GCC_OPTIONS='-v' '-std=c++14' '-o' 'foo' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
env g++ -v --std=c++14 foo.cpp -o foo 21.46s user 1.34s system 99% cpu 22.901
total
I am using Arch Linux. I can also confirm this behaviour for --std=c++17.
>From gcc-bugs-return-601845-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 17:41:15 2018
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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/84842] [7/8 Regression] ICE in verify_target_availability, at sel-sched.c:1569
Date: Tue, 17 Apr 2018 17:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84842
Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-17
Ever confirmed|0 |1
--- Comment #11 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Thanks, I managed to reproduce it. The unusual thing here is hardreg 63 being
considered call-clobbered in its reg_raw_mode=TImode but not narrower modes. We
have
(insn 97 29 98 4 (set (reg:DI 63 31 [160])
(unspec:DI [
(reg:SI 29 29)
] UNSPEC_LFIWAX)) "pr84842.i":5 344 {lfiwax}
(expr_list:REG_DEAD (reg:SI 29 29)
(nil)))
and sched-deps noting a REG_DEP_OUTPUT dependence on regno 63 against a
preceding call insn according to rs6000_hard_regno_call_part_clobbered
(regno=63, mode=E_TImode). I assume what the backend in conveying there is that
only the low part of the register will be preserved by callees.
However, when we move up the instruction we don't have a dependence. The LHS is
DImode, so that seems correct as well: sched-deps had a more conservative
answer because its dependence lists are not separated per mode.
Andrey, does the above make sense? Can the assert be relaxed?
>From gcc-bugs-return-601846-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 17:55:21 2018
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug web/82686] Debian sid powerpc64-unknown-linux-gnu 4.13.0-1-powerpc64 bootstrap breaks in stage3 with unexpected requirement for bdw-gc
Date: Tue, 17 Apr 2018 17:55:00 -0000
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--- Comment #15 from Dennis Clarke <dclarke at blastwave dot org> ---
The real issue here is libquadmath which seems to be based
on sources from Sun Microsystems software implementation of
the 128-bit floating point operations.
see 85440
>From gcc-bugs-return-601847-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 18:22:44 2018
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Subject: [Bug target/85424] The __builtin_packlongdouble function might have issues with the output overlapping the inputs
Date: Tue, 17 Apr 2018 18:22:00 -0000
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--- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> ---
Author: meissner
Date: Tue Apr 17 18:22:08 2018
New Revision: 259441
URL: https://gcc.gnu.org/viewcvs?rev=259441&root=gcc&view=rev
Log:
2018-04-17 Michael Meissner <meissner@linux.vnet.ibm.com>
PR target/85424
* config/rs6000/rs6000.md (pack<mode>): Do not try handle a pack
where the inputs overlap with the output.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/rs6000.md
>From gcc-bugs-return-601848-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 18:41:57 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85441] Empty loops not optimised away
Date: Tue, 17 Apr 2018 18:41:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |compile-time-hog,
| |memory-hog
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-17
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
You didn't use any optimization flags, so nothing is optimized away.
But it should be possible to skip evaluation of empty loops inside constant
expression evaluation.
>From gcc-bugs-return-601849-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 18:46:31 2018
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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85430] [7/8 Regression] ICE: SIGSEGV in memory_operand at recog.c:1358 with -O2 -fno-tree-ccp -fno-tree-fre
Date: Tue, 17 Apr 2018 18:46:00 -0000
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--- Comment #4 from Zdenek Sojka <zsojka at seznam dot cz> ---
Observation about generated code:
$ x86_64-pc-linux-gnu-gcc -O2 -fno-tree-ccp -fno-tree-fre testcase.c -S -o-
...
foo:
movl %edi, %eax
addb %al, %al
ret
...
which looks superior to code generated by -O1/-O2/-O3/-Os/-Og :
...
foo:
movsbl %dil, %edx
addl %edx, %edx
movl %edi, %eax
movb %dl, %al
ret
...
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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++/84630] [6/7/8 Regression] ICE: TYPE_NAME() used on error_mark_node in tsubst_lambda_expr, at cp/pt.c:17141
Date: Tue, 17 Apr 2018 19:44:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Seems easy.
>From gcc-bugs-return-601851-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 20:20:34 2018
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From: "ian at airs dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug go/84948] [8 regression] ICE in set_from, at go/gofrontend/types.cc:2660
Date: Tue, 17 Apr 2018 20:20:00 -0000
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--- Comment #1 from Ian Lance Taylor <ian at airs dot com> ---
That is just the start of the problem. The garbage collector assumes that all
pointers are aligned to their natural boundary. That is, it expects that on a
system with four byte pointers, they are always aligned to a four byte boundary
when stored in memory. The garbage collector's data structures are designed
around that assumption. That will be hard to change.
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Subject: [Bug sanitizer/85230] asan: false positives in kernel on allocas
Date: Tue, 17 Apr 2018 20:23:00 -0000
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--- Comment #22 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Apr 17 20:22:50 2018
New Revision: 259446
URL: https://gcc.gnu.org/viewcvs?rev=259446&root=gcc&view=rev
Log:
PR sanitizer/85230
* asan.c (handle_builtin_stack_restore): Adjust comment. Emit
__asan_allocas_unpoison call and last_alloca_addr = new_sp before
__builtin_stack_restore rather than after it.
* builtins.c (expand_asan_emit_allocas_unpoison): Pass
arg1 + (virtual_dynamic_stack_rtx - stack_pointer_rtx) as second
argument instead of virtual_dynamic_stack_rtx.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/asan.c
trunk/gcc/builtins.c
>From gcc-bugs-return-601853-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 20:33:38 2018
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Subject: [Bug sanitizer/85230] asan: false positives in kernel on allocas
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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> ---
Fixed for 8+ so far, backports will come later.
>From gcc-bugs-return-601854-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 20:42:54 2018
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Subject: [Bug target/85436] [7 Regression] ICE compiling go code with -mcpu=power9
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Peter Bergner <bergner at gcc dot gnu.org> changed:
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Attachment #43964|0 |1
is obsolete| |
Attachment #43966|0 |1
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--- Comment #2 from Peter Bergner <bergner at gcc dot gnu.org> ---
Created attachment 43968
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43968&action=edit
An even smaller test case
This is a one function test case which helps reading the rtl dumps
>From gcc-bugs-return-601855-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 20:44:32 2018
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Subject: [Bug testsuite/85326] `make check` fails with `--disable-bootstrap` and `--enable-languages=c`
Date: Tue, 17 Apr 2018 20:44:00 -0000
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Apr 17 20:43:49 2018
New Revision: 259447
URL: https://gcc.gnu.org/viewcvs?rev=259447&root=gcc&view=rev
Log:
PR testsuite/85326
* g++.dg/other/pr81422.C: Require effective target tls and c++11.
* g++.dg/other/pr60675.C: Likewise. Remove -std=c++11 from dg-options.
* g++.dg/other/sve_tls_2.C: Require effective target tls.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/other/pr60675.C
trunk/gcc/testsuite/g++.dg/other/pr81422.C
trunk/gcc/testsuite/g++.dg/other/sve_tls_2.C
>From gcc-bugs-return-601856-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 20:47:57 2018
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From: "wilco at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85434] Address of stack protector guard spilled to stack on ARM
Date: Tue, 17 Apr 2018 20:47:00 -0000
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Wilco <wilco at gcc dot gnu.org> changed:
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--- Comment #4 from Wilco <wilco at gcc dot gnu.org> ---
Clearly rematerialization isn't working correctly. Immediates and constant
addresses like this should never be spilled (using MOV/MOVK could increase
codesize, but with -Os you should use the literal pool anyway). Check
legitimate_constant_p returns true, see
https://gcc.gnu.org/ml/gcc-patches/2017-08/msg00052.html for how it's done on
AArch64.
>From gcc-bugs-return-601857-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 20:50:07 2018
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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: Tue, 17 Apr 2018 20:50:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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--- Comment #3 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #2)
> So rptr points to an invalid memory. Question is whether a store/load from
> the address can happen?
No; rptr never stores to anywhere afterwards.
However, I concur that it would be a good idea to clean up the
logic for this part so that invalid pointers are never
even generated.
Something to look at for gcc 9.
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From: "jsm28 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/85442] New: [8 Regression] cxx11-ios_failure.lo build fails for microblaze
Date: Tue, 17 Apr 2018 21:25:00 -0000
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Bug ID: 85442
Summary: [8 Regression] cxx11-ios_failure.lo build fails for
microblaze
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Target: microblaze-linux-gnu
My glibc bot building with build-many-glibcs.py shows the libstdc++ build
failing for microblaze:
https://sourceware.org/ml/libc-testresults/2018-q2/msg00051.html
cxx11-ios_failure-lt.s: Assembler messages:
cxx11-ios_failure-lt.s: Fatal error: duplicate .debug_line sections
Makefile:766: recipe for target 'cxx11-ios_failure.lo' failed
make[6]: *** [cxx11-ios_failure.lo] Error 1
Introduced by r259281. I don't know whether this is a bug in the microblaze
compiler or in the special makefile code that generates this .s file.
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Subject: [Bug rtl-optimization/85431] UBSAN: ../../gcc/dse.c:303:15: runtime error: shift exponent 64 is too large for 64-bit type 'long unsigned int'
Date: Tue, 17 Apr 2018 21:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85431
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug other/63426] [meta-bug] Issues found with -fsanitize=undefined
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63426
Bug 63426 depends on bug 85431, which changed state.
Bug 85431 Summary: UBSAN: ../../gcc/dse.c:303:15: runtime error: shift exponent 64 is too large for 64-bit type 'long unsigned int'
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85431
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |FIXED
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85431] UBSAN: ../../gcc/dse.c:303:15: runtime error: shift exponent 64 is too large for 64-bit type 'long unsigned int'
Date: Tue, 17 Apr 2018 21:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85431
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Apr 17 21:38:45 2018
New Revision: 259448
URL: https://gcc.gnu.org/viewcvs?rev=259448&root=gcc&view=rev
Log:
PR rtl-optimization/85431
* dse.c (record_store): Ignore zero width stores.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dse.c
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From: "wilson at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/84856] Bootstrap failure on riscv: comparison of integer expressions of different signedness
Date: Tue, 17 Apr 2018 21:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84856
--- Comment #10 from Jim Wilson <wilson at gcc dot gnu.org> ---
Author: wilson
Date: Tue Apr 17 21:41:07 2018
New Revision: 259449
URL: https://gcc.gnu.org/viewcvs?rev=259449&root=gcc&view=rev
Log:
RISC-V: Fix 32-bit stack pointer alignment problem.
gcc/
PR 84856
* config/riscv/riscv.c (riscv_compute_frame_info): Add calls to
RISCV_STACK_ALIGN when using outgoing_args_size and pretend_args_size.
Set arg_pointer_offset after using pretend_args_size.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/riscv/riscv.c
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Subject: [Bug sanitizer/85394] [8 Regression] Unable to run sanitized executables on ppc64le Ubuntu and SLES
Date: Tue, 17 Apr 2018 21:52:00 -0000
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seurer at gcc dot gnu.org changed:
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--- Comment #3 from seurer at gcc dot gnu.org ---
I tested the patch Jakub shows and it works fine on powerpc64 with kernels
ranging from 2.6 to 4.13.
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Subject: [Bug debug/84637] gcc/dbxout.c:684:14: runtime error: negation of -9223372036854775808 cannot be represented in type 'long int'; cast to an unsigned type to negate this value to itself
Date: Tue, 17 Apr 2018 22:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84637
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Apr 17 22:18:47 2018
New Revision: 259451
URL: https://gcc.gnu.org/viewcvs?rev=259451&root=gcc&view=rev
Log:
PR debug/84637
* dbxout.c (dbxout_int): Perform negation in unsigned int type.
(stabstr_D): Change type of unum from unsigned int to
unsigned HOST_WIDE_INT. Perform negation in unsigned HOST_WIDE_INT
type.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dbxout.c
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Subject: [Bug other/63426] [meta-bug] Issues found with -fsanitize=undefined
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63426
Bug 63426 depends on bug 84637, which changed state.
Bug 84637 Summary: gcc/dbxout.c:684:14: runtime error: negation of -9223372036854775808 cannot be represented in type 'long int'; cast to an unsigned type to negate this value to itself
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84637
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug debug/84637] gcc/dbxout.c:684:14: runtime error: negation of -9223372036854775808 cannot be represented in type 'long int'; cast to an unsigned type to negate this value to itself
Date: Tue, 17 Apr 2018 22:21:00 -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> ---
Fixed.
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From: "xvl5190 at psu dot edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85443] New: internal compiler error: Segmentation fault
Date: Tue, 17 Apr 2018 22:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85443
Bug ID: 85443
Summary: internal compiler error: Segmentation fault
Product: gcc
Version: 5.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
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This is the code that triggers the crash:
char acDummy[0xf0] __attribute__ ((__BELOW100__));
unsigned short B100 __attribute__ ((__BELOW100__));
unsigned short *p = &B100;
unsigned short wData = 0x1234;
_Atomic int i = 3;
int a1 = sizeof (i + 1);
void
Do (void)
{
B100 = wData;
}
int
main (void)
{
*p = 0x9876;
Do ();
return (*p == 0x1234) ? 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 libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Tue, 17 Apr 2018 23:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85440
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> ---
If you want libquadmath with powerpc* support, you need GCC 8 or later.
>From gcc-bugs-return-601869-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 23:19:14 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/85442] [8 Regression] cxx11-ios_failure.lo build fails for microblaze
Date: Tue, 17 Apr 2018 23:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85442
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43969
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43969&action=edit
gcc8-pr85442.patch
Perhaps we want to assemble with -g0, because either the .s file already
contains debug info from the compiler and then we don't want to add one from
the assembler, or the user doesn't want debug info at all.
Completely untested though.
>From gcc-bugs-return-601870-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 17 23:30:39 2018
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From: "ian at airs dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug go/85429] Several gotools tests FAIL with Solaris as
Date: Tue, 17 Apr 2018 23:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85429
--- Comment #1 from Ian Lance Taylor <ian at airs dot com> ---
Does the SPARC Solaris assembler support a syntax like
.section ".go.buildid",#exclude
? That's what gas seems to support for compatibility.
Does that syntax work for x86?
>From gcc-bugs-return-601871-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 01:18:40 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] New: asm specifier on typedef silently ignored
Date: Wed, 18 Apr 2018 01:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85444
Bug ID: 85444
Summary: asm specifier on typedef silently ignored
Product: gcc
Version: unknown
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Created attachment 43970
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43970&action=edit
Patch to add warning for ignored asm specifiers.
In a declaration like
typedef struct {} x asm ("X");
the asm label is properly ignored but the user is not alerted to this.
I am attaching a patch that will add a warning at -Wpedantic to alert the user
in a case such as this.
This is the first time that I am submitting a patch to GCC and I am really
nervous about making sure that I followed the proper protocol. I am sure that
there are plenty of things that I am missing but I look forward to cleaning it
up and learning the process.
Thanks for your patience!
>From gcc-bugs-return-601872-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 01:21:37 2018
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Subject: [Bug c++/85444] asm specifier on typedef silently ignored
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--- Comment #1 from Will Hawkins <whh8b at virginia dot edu> ---
Created attachment 43971
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43971&action=edit
Example that triggers the newly added warning when compiled with -Wpedantic
Example that triggers the newly added warning when compiled with -Wpedantic
>From gcc-bugs-return-601873-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 01:32:35 2018
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From: "dave.anglin at bell dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/84442] FAIL: 30_threads/thread/cons/terminate.cc (test for excess errors)
Date: Wed, 18 Apr 2018 01:32:00 -0000
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--- Comment #5 from dave.anglin at bell dot net ---
On 2018-04-17 10:21 AM, redi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84442
>
> --- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
> Dave, does the patch in comment 3 fix the FAIL?
>
Yes, it fixes the fail.
Thanks,
Dave
>From gcc-bugs-return-601874-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 02:24:59 2018
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Wed, 18 Apr 2018 02:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85440
--- Comment #2 from Dennis Clarke <dclarke at blastwave dot org> ---
Thank you very much Sir!
So then .. where is this gcc 8 that you speak of ? Still just a
nightly test release or is there an actual tarball hidden away?
>From gcc-bugs-return-601876-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 03:32:44 2018
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug web/82686] Debian sid powerpc64-unknown-linux-gnu 4.13.0-1-powerpc64 bootstrap breaks in stage3 with unexpected requirement for bdw-gc
Date: Wed, 18 Apr 2018 03:32:00 -0000
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--- Comment #16 from Dennis Clarke <dclarke at blastwave dot org> ---
Can we close this as a non-issue?
>From gcc-bugs-return-601875-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 03:32:27 2018
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
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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: Wed, 18 Apr 2018 03:32:00 -0000
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--- Comment #10 from Dennis Clarke <dclarke at blastwave dot org> ---
Can we close this as a non-issue?
>From gcc-bugs-return-601878-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 03:47:51 2018
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Subject: [Bug target/35363] Missing bit field coalescing optimization
Date: Wed, 18 Apr 2018 03:47:00 -0000
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--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There are two issues here, one is SLOW_BYTE_ACCESS and the second is the
lowering of bit-fields. I am going to fix the lower part for GCC 9. The
SLOW_BTYE_ACCESS was being looked at by someone else in the recent past but I
can't find the email about it.
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Subject: [Bug c++/85437] [8 Regression] member pointer static upcast rejected in a constexpr context
Date: Wed, 18 Apr 2018 03:47:00 -0000
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |aoliva at gcc dot gnu.org
--- Comment #6 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
FTR, there's a patch with various caveats at
https://gcc.gnu.org/ml/gcc-patches/2018-04/msg00852.html
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Subject: [Bug c++/80290] [6/7/8 Regression] g++ uses unreasonable amount of memory compiling nested string maps
Date: Wed, 18 Apr 2018 05:18:00 -0000
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--- Comment #21 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Author: aoliva
Date: Wed Apr 18 05:17:26 2018
New Revision: 259457
URL: https://gcc.gnu.org/viewcvs?rev=259457&root=gcc&view=rev
Log:
[PR c++/80290] recycle tinst garbage sooner
tinst_level objects are created during template instantiation, and
they're most often quite short-lived, but since there's no intervening
garbage collection, they accumulate throughout the pass while most by
far could be recycled after a short while. The original testcase in
PR80290, for example, creates almost 55 million tinst_level objects,
all but 10 thousand of them without intervening GC, but we don't need
more than 284 of them live at a time.
Furthermore, in many cases, TREE_LIST objects are created to stand for
the decl in tinst_level. In most cases, those can be recycled as soon
as the tinst_level object is recycled; in some relatively common
cases, they are modified and reused in up to 3 tinst_level objects.
In the same testcase, TREE_LISTs are used in all but 3 thousand of the
tinst_level objects, and we don't need more than 89 tinst_level
objects with TREE_LISTs live at a time. Furthermore, all but 2
thousand of those are created without intervening GC.
This patch arranges for tinst_level objects to be refcounted (I've
seen as many as 20 live references to a single tinst_level object in
my testing), and for pending_template, tinst_level and TREE_LIST
objects that can be recycled to be added to freelists; that's much
faster than ggc_free()ing them and reallocating them shortly
thereafter. In fact, the introduction of such freelists is what makes
this entire patch lighter-weight, when it comes to memory use, and
faster. With refcounting alone, the total memory footprint was still
about the same, and we spent more time.
In order to further reduce memory use, I've arranged for us to create
TREE_LISTs lazily, only at points that really need them (when printing
error messages). This grows tinst_level by an additional pointer, but
since a TREE_LIST holds a lot more than an extra pointer, and
tinst_levels with TREE_LISTs used to be allocated tens of thousands of
times more often than plain decl ones, we still save memory overall.
I was still not quite happy about growing memory use in cases that
used template classes but not template overload resolution, so I
changed the type of the errors field to unsigned short, from int.
With that change, in_system_header_p and refcount move into the same
word or half-word that used to hold errors, releasing a full word,
bringing tinst_level back to its original size, now without any
padding.
The errors field is only used to test whether we've had any errors
since the expansion of some template, to skip the expansion of further
templates. If we get 2^16 errors or more, it is probably reasonable
to refrain from expanding further templates, even if we would expand
them before this change.
With these changes, compile time for the original testcase at -O0,
with default checking enabled, is cut down by some 3.7%, total GCable
memory allocation is cut down by almost 20%, and total memory use (as
reported by GNU time as maxresident) is cut down by slightly over 15%.
for gcc/cp/ChangeLog
PR c++/80290
* cp-tree.h (struct tinst_level): Split decl into tldcl and
targs. Add private split_list_p, tree_list_p, and not_list_p
inline const predicates; to_list private member function
declaration; free public member function declaration; list_p,
get_node and maybe_get_node accessors, and refcount data
member. Narrow errors to unsigned short.
* error.c (print_instantiation_full_context): Use new
accessors.
(print_instantiation_partial_context_line): Likewise. Drop
const from tinst_level-typed parameter.
* mangle.c (mangle_decl_string): Likewise.
* pt.c (freelist): New template class.
(tree_list_freelist_head): New var.
(tree_list_freelist): New fn, along with specializations.
(tinst_level_freelist_head): New var.
(pending_template_freelist_head): Likewise.
(tinst_level_freelist, pending_template_freelist): New fns.
(tinst_level::to_list, tinst_level::free): Define.
(inc_refcount_use, dec_refcount_use): New fns for tinst_level.
(set_refcount_ptr): New template fn.
(add_pending_template): Adjust for refcounting, freelists and
new accessors.
(neglectable_inst_p): Take a NULL d as a non-DECL.
(limit_bad_template_recursion): Use new accessors.
(push_tinst_level): New overload to create the list.
(push_tinst_level_loc): Make it static, split decl into two
args, adjust tests and initialization to cope with split
lists, use freelist, adjust for refcounting.
(push_tinst_level_loc): New wrapper with the old interface.
(pop_tinst_level): Adjust for refcounting.
(record_last_problematic_instantiation): Likewise.
(reopen_tinst_level): Likewise. Use new accessors.
(instantiate_alias_template): Adjust for split list.
(fn_type_unification): Likewise.
(get_partial_spec_bindings): Likewise.
(instantiate_pending_templates): Use new accessors. Adjust
for refcount. Release pending_template to freelist.
(instantiating_current_function_p): Use new accessors.
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/cp-tree.h
trunk/gcc/cp/error.c
trunk/gcc/cp/mangle.c
trunk/gcc/cp/pt.c
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Subject: [Bug c++/80290] [6/7 Regression] g++ uses unreasonable amount of memory compiling nested string maps
Date: Wed, 18 Apr 2018 06:03:00 -0000
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|aoliva at gcc dot gnu.org |unassigned at gcc dot gnu.org
Summary|[6/7/8 Regression] g++ uses |[6/7 Regression] g++ uses
|unreasonable amount of |unreasonable amount of
|memory compiling nested |memory compiling nested
|string maps |string maps
--- Comment #22 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
The patch is in. I suppose there's still room for improvement, but this was as
far as I could get for now.
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Subject: [Bug web/82686] Debian sid powerpc64-unknown-linux-gnu 4.13.0-1-powerpc64 bootstrap breaks in stage3 with unexpected requirement for bdw-gc
Date: Wed, 18 Apr 2018 06:14:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=85440
Resolution|--- |INVALID
--- Comment #17 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Dennis Clarke from comment #16)
> Can we close this as a non-issue?
OK.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/71959] [OpenACC] lto1: ICE in inline_read_section, at ipa-fnsummary.c:3314
Date: Wed, 18 Apr 2018 06:51:00 -0000
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |vries at gcc dot gnu.org
Summary|[OpenACC] #pragma acc |[OpenACC] lto1: ICE in
|parallel leads to segfault |inline_read_section, at
|in |ipa-fnsummary.c:3314
|x86_64-pc-linux-gnu-accel-n |
|vptx-none-gcc |
--- Comment #9 from Tom de Vries <vries at gcc dot gnu.org> ---
og7 test-case libgomp.oacc-c++/pr71959.C fails with ICE on trunk:
...
during IPA pass: fnsummary
lto1: internal compiler error: in inline_read_section, at ipa-fnsummary.c:3314
0x89ed23 inline_read_section
gcc/ipa-fnsummary.c:3314
0x89ed23 ipa_fn_summary_read
gcc/ipa-fnsummary.c:3365
0x9e2a61 ipa_read_summaries_1
gcc/passes.c:2846
0x5ad5f3 read_cgraph_and_symbols
gcc/lto/lto.c:2961
0x5ad5f3 lto_main()
lto/lto.c:3356
...
Updating summary.
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Subject: [Bug c++/80290] [6/7 Regression] g++ uses unreasonable amount of memory compiling nested string maps
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--- Comment #23 from Andrew Jeffery <andrew at aj dot id.au> ---
> The patch is in. I suppose there's still room for improvement, but this was as far as I could get for now.
Thanks for your effort! I'll take it for a test drive when I get a moment, we
hit this case still with one of our codebases.
Is there a chance the pach will be backported? I'd love to apply it to the
7.3.0 release (which we're using via Yocto).
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Subject: [Bug c++/84463] [6/7/8 Regression] Supposedly-incompliant "error: '* key0' is not a constant expression"
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84463
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Apr 18 06:57:45 2018
New Revision: 259458
URL: https://gcc.gnu.org/viewcvs?rev=259458&root=gcc&view=rev
Log:
PR c++/84463
* typeck.c (cp_build_addr_expr_1): Move handling of offsetof-like
tricks from here to ...
* cp-gimplify.c (cp_fold) <case ADDR_EXPR>: ... here. Only use it
if INDIRECT_REF's operand is INTEGER_CST cast to pointer type.
* g++.dg/cpp0x/constexpr-nullptr-1.C: Add -O1 to dg-options.
* g++.dg/cpp0x/constexpr-nullptr-2.C: Expect different diagnostics
in two cases. Uncomment two other tests and add expected dg-error for
them.
* g++.dg/init/struct2.C: Cast to int rather than long to avoid
-Wnarrowing diagnostics on some targets for c++11.
* g++.dg/parse/array-size2.C: Remove xfail.
* g++.dg/cpp0x/constexpr-84463.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-84463.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/cp-gimplify.c
trunk/gcc/cp/typeck.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-nullptr-1.C
trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-nullptr-2.C
trunk/gcc/testsuite/g++.dg/init/struct2.C
trunk/gcc/testsuite/g++.dg/parse/array-size2.C
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Subject: [Bug c++/84463] [6/7 Regression] Supposedly-incompliant "error: '* key0' is not a constant expression"
Date: Wed, 18 Apr 2018 07:03:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[6/7/8 Regression] |[6/7 Regression]
|Supposedly-incompliant |Supposedly-incompliant
|"error: '* key0' is not a |"error: '* key0' is not a
|constant expression" |constant expression"
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 8+. Not really sure if this patch should be backported.
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Subject: [Bug sanitizer/85389] posix_memalign() crash with address sanitizer when passing invalid arguments
Date: Wed, 18 Apr 2018 07:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85389
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Apr 18 07:02:40 2018
New Revision: 259459
URL: https://gcc.gnu.org/viewcvs?rev=259459&root=gcc&view=rev
Log:
PR sanitizer/85389
* asan/asan_allocator.h (kAllocatorSpace): For __powerpc64__ change
from 0xa0000000000ULL to ~(uptr)0.
Modified:
trunk/libsanitizer/ChangeLog
trunk/libsanitizer/asan/asan_allocator.h
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Subject: [Bug sanitizer/85389] posix_memalign() crash with address sanitizer when passing invalid arguments
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85389
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Oops, the above comment doesn't belong to this bug. The commit was supposed to
fix PR85394 instead.
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Subject: [Bug sanitizer/85394] [8 Regression] Unable to run sanitized executables on ppc64le Ubuntu and SLES
Date: Wed, 18 Apr 2018 07:07:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Apr 18 07:02:40 2018
New Revision: 259459
URL: https://gcc.gnu.org/viewcvs?rev=259459&root=gcc&view=rev
Log:
PR sanitizer/85389
* asan/asan_allocator.h (kAllocatorSpace): For __powerpc64__ change
from 0xa0000000000ULL to ~(uptr)0.
Modified:
trunk/libsanitizer/ChangeLog
trunk/libsanitizer/asan/asan_allocator.h
Fixed on the trunk (though backports are still in order to release branches).
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Subject: [Bug target/85445] New: [nvptx, openacc] Calls to worker and vector routine broken
Date: Wed, 18 Apr 2018 07:47:00 -0000
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Bug ID: 85445
Summary: [nvptx, openacc] Calls to worker and vector routine
broken
Product: gcc
Version: 8.0
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og7 test-case ref-1.C fails in execution when run with trunk:
...
/* { dg-do run } */
extern "C" int printf (char const *, ...);
#pragma acc routine vector
void Vector (int *ptr,int n,const int &inc)
{
#pragma acc loop vector
for (unsigned ix = 0; ix < n; ix++)
ptr[ix] += inc;
}
#pragma acc routine worker
void Worker (int *ptr, int m, int n, const int &inc)
{
#pragma acc loop worker
for (unsigned ix = 0; ix < m; ix++)
Vector(ptr + ix * n, n, inc);
}
int main ()
{
const int n = 32, m=32;
int ary[m][n];
unsigned ix, iy;
for (ix = m; ix--;)
for (iy = n; iy--;)
ary[ix][iy] = (ix << 8) + iy;
#pragma acc parallel copy(ary)
{
Worker (&ary[0][0], m, n, 1<<16);
}
int err = 0;
for (ix = m; ix--;)
for (iy = n; iy--;)
if (ary[ix][iy] != ((1 << 16) + (ix << 8) + iy))
{
printf ("ary[%u][%u] = %x expected %x\n",
ix, iy, ary[ix][iy], ((1 << 16) + (ix << 8) + iy));
err++;
}
if (err)
{
printf ("%d failed\n", err);
return 1;
}
#pragma acc parallel copy(ary)
{
Vector (&ary[0][0], m * n, (1<<24) - (1<<16));
}
for (ix = m; ix--;)
for (iy = n; iy--;)
if (ary[ix][iy] != ((1 << 24) + (ix << 8) + iy))
{
printf ("ary[%u][%u] = %x expected %x\n",
ix, iy, ary[ix][iy], ((1 << 24) + (ix << 8) + iy));
err++;
}
if (err)
{
printf ("%d failed\n", err);
return 1;
}
return 0;
}
...
og7 fix was submitted here (
https://gcc.gnu.org/ml/gcc-patches/2016-08/msg01730.html ) and committed as
r239736.
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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++/84630] [6/7 Regression] ICE: TYPE_NAME() used on error_mark_node in tsubst_lambda_expr, at cp/pt.c:17141
Date: Wed, 18 Apr 2018 08:04:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[6/7/8 Regression] ICE: |[6/7 Regression] ICE:
|TYPE_NAME() used on |TYPE_NAME() used on
|error_mark_node in |error_mark_node in
|tsubst_lambda_expr, at |tsubst_lambda_expr, at
|cp/pt.c:17141 |cp/pt.c:17141
--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed in trunk so far.
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Subject: [Bug c++/84630] [6/7/8 Regression] ICE: TYPE_NAME() used on error_mark_node in tsubst_lambda_expr, at cp/pt.c:17141
Date: Wed, 18 Apr 2018 08:04:00 -0000
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--- Comment #4 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed Apr 18 08:03:45 2018
New Revision: 259460
URL: https://gcc.gnu.org/viewcvs?rev=259460&root=gcc&view=rev
Log:
/cp
2018-04-18 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84630
* pt.c (tsubst_lambda_expr): Check begin_lambda_type return value
for error_mark_node.
/testsuite
2018-04-18 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84630
* g++.dg/cpp0x/pr84630.C: New.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/pr84630.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/pt.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-601892-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 08:28:18 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 tree-optimization/85446] New: [7/8 Regression] wrong-code on riscv64
Date: Wed, 18 Apr 2018 08:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85446
Bug ID: 85446
Summary: [7/8 Regression] wrong-code on riscv64
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: jakub at gcc dot gnu.org
Target Milestone: ---
Starting with r238754 we can miscompile narrowing conversion of pointer to
integer compared against constant (unfortunately the only testcase for this I
have is for riscv64 (due to different IVOPTS decisions) which has been
introduced in r245224, so technically this is just latent bug).
Testcase for -O2 -fwrapv -fno-strict-aliasing -mabi=lp64 -march=rv64g
typedef struct
{
void *cdr;
void *car;
} cons_;
typedef cons_ *Cons;
typedef struct
{
union
{
void *_GCself;
unsigned char flags[sizeof (void *) / sizeof (unsigned char)];
} header;
void *symvalue;
void *symfunction;
void *hashcode;
void *proplist;
void *pname;
void *homepackage;
} symbol_;
typedef symbol_ *Symbol;
typedef struct
{
union
{
void *_GCself;
unsigned char flags[sizeof (void *) / sizeof (unsigned char)];
} header;
signed char rectype;
unsigned char recflags;
unsigned char reclength;
unsigned char recxlength;
void *ht_maxcount;
void *ht_kvtable;
void *ht_lookupfn;
void *ht_hashcodefn;
void *ht_testfn;
void *ht_gcinvariantfn;
void *ht_rehash_size;
void *ht_mincount_threshold;
void *ht_mincount;
void *ht_test;
void *ht_hash;
unsigned int ht_size;
} *Hashtable;
typedef struct
{
union
{
void *_GCself;
unsigned char flags[sizeof (void *) / sizeof (unsigned char)];
} header;
unsigned int length;
void *hal_filler;
void *hal_itable;
void *hal_count;
void *hal_freelist;
void *hal_data[0];
} *HashedAlist;
extern void **STACK;
extern struct symbol_tab_
{
symbol_ S_nil;
symbol_ S_t;
} symbol_tab_data;
extern unsigned int mv_count;
extern void *mv_space[127];
void
C_hash_table_iterate (void)
{
void *state = (STACK -= 1, STACK[0]);
if (((unsigned long) state) & (1UL << 62))
{
void *table = ((Cons) ((void *) ((unsigned long) state & ((1UL << 56) -
1))))->car;
while (1)
{
unsigned int index = (unsigned long) ((unsigned long) ((((Cons)
((void *) ((unsigned long) state & ((1UL << 56) - 1))))->cdr)) & ((2UL << 55) -
1));
if (index == 0)
break;
((Cons) ((void *) ((unsigned long) state & ((1UL << 56) - 1))))->cdr
= ((void *) ((unsigned char *) ((((Cons) ((void *) ((unsigned long) state &
((1UL << 56) - 1))))->cdr)) + (long) (-1)));
{
void **KVptr = &((HashedAlist) ((void *) ((unsigned long) table &
((1UL << 56) - 1))))->hal_data[3 * index - 3];
if (!(KVptr[0] == (void *) 0x380000000FFFFFFUL))
{
mv_space[0] = (void *) ((unsigned char *)
(&symbol_tab_data.S_t) + (1UL << 58));
mv_space[1] = KVptr[0];
mv_space[2] = KVptr[1];
mv_count = 3;
return;
}
}
}
}
mv_space[0] = (void *) ((unsigned char *) (&symbol_tab_data.S_nil) + (1UL <<
58));
mv_count = 1;
}
The difference between cddce3 and forwprop4 shows the bug:
unsigned int index;
...
void * prephitmp_40;
...
<bb 4> [local count: 1073741825]:
# prephitmp_40 = PHI <pretmp_35(3), _11(5)>
# ivtmp.14_36 = PHI <ivtmp.14_42(3), ivtmp.14_9(5)>
index_46 = (unsigned int) prephitmp_40;
- if (index_46 == 0)
+ if (prephitmp_40 == 0B)
goto <bb 7>; [5.50%]
else
goto <bb 5>; [94.50%]
The original was comparing only the low 32-bits of the pointer against 0, the
modified code compares the whole pointer against NULL.
>From gcc-bugs-return-601893-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 08:29:11 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85446] [7/8 Regression] wrong-code on riscv64
Date: Wed, 18 Apr 2018 08:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85446
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-04-18
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
Target Milestone|--- |7.4
Ever confirmed|0 |1
>From gcc-bugs-return-601894-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 08:30:40 2018
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Subject: [Bug tree-optimization/85446] [7/8 Regression] wrong-code on riscv64
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85446
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43972
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43972&action=edit
gcc8-pr85446.patch
Untested fix.
>From gcc-bugs-return-601895-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 08:34:01 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/84149] [8 Regression] SPEC CPU2017 505.mcf/605.mcf ~10% performance regression with r256888
Date: Wed, 18 Apr 2018 08:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84149
--- Comment #12 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 43973
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43973&action=edit
Unreduced test-case
Unfortunately I see one more ICE (reduced from Firefox w/ -O3). I'm currently
reducing that, but hopefully will be possible to debug for unreduced version.
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Subject: [Bug ipa/84149] [8 Regression] SPEC CPU2017 505.mcf/605.mcf ~10% performance regression with r256888
Date: Wed, 18 Apr 2018 08:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84149
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
--- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #12)
> Created attachment 43973 [details]
> Unreduced test-case
>
> Unfortunately I see one more ICE (reduced from Firefox w/ -O3). I'm
> currently reducing that, but hopefully will be possible to debug for
> unreduced version.
$ ./xg++ -B. -O3 -c ~/Downloads/ice.ii
/home/marxin/Downloads/ice.ii:5441:214: internal compiler error: in
create_specialized_node, at ipa-cp.c:3870
already_AddRefed<nsIURI>
nsImageLoadingContent::GetCurrentRequestFinalURI() { nsCOMPtr<nsIURI> uri;
if (mCurrentRequest) { mCurrentRequest->GetFinalURI(getter_AddRefs(uri));
} return uri.forget(); }
^
0x1624b99 create_specialized_node
../../gcc/ipa-cp.c:3870
0x16252a2 decide_about_value<tree_node*>
../../gcc/ipa-cp.c:4699
0x1626440 decide_whether_version_node
../../gcc/ipa-cp.c:4743
0x1626440 ipcp_decision_stage
../../gcc/ipa-cp.c:4906
0x1626440 ipcp_driver
../../gcc/ipa-cp.c:5086
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Subject: [Bug other/84613] [meta-bug] SPEC compiler performance issues
Date: Wed, 18 Apr 2018 08:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84613
Bug 84613 depends on bug 84149, which changed state.
Bug 84149 Summary: [8 Regression] SPEC CPU2017 505.mcf/605.mcf ~10% performance regression with r256888
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84149
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
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Subject: [Bug middle-end/84016] [8 Regression] Spec2000 regression around Jan 14 and Jan 19 2018
Date: Wed, 18 Apr 2018 08:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84016
Bug 84016 depends on bug 84149, which changed state.
Bug 84149 Summary: [8 Regression] SPEC CPU2017 505.mcf/605.mcf ~10% performance regression with r256888
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84149
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
Bug 26163 depends on bug 84149, which changed state.
Bug 84149 Summary: [8 Regression] SPEC CPU2017 505.mcf/605.mcf ~10% performance regression with r256888
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84149
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
>From gcc-bugs-return-601900-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 08:48:42 2018
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Wed, 18 Apr 2018 08:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81084
--- Comment #25 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Apr 18 08:47:26 2018
New Revision: 259461
URL: https://gcc.gnu.org/viewcvs?rev=259461&root=gcc&view=rev
Log:
PR target/81084
* config.gcc: Obsolete powerpc*-*-*spe*.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config.gcc
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Subject: [Bug ipa/85447] New: [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
Date: Wed, 18 Apr 2018 08:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85447
Bug ID: 85447
Summary: [8 Regression] ICE in create_specialized_node, at
ipa-cp.c:3870 since r259319
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
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CC: jamborm at gcc dot gnu.org, marxin at gcc dot gnu.org
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Created attachment 43974
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43974&action=edit
unreduc
Comes from Firefox with -O3:
$ ./xg++ -B. -O3 -c ~/Downloads/ice.ii
/home/marxin/Downloads/ice.ii:5441:214: internal compiler error: in
create_specialized_node, at ipa-cp.c:3870
already_AddRefed<nsIURI>
nsImageLoadingContent::GetCurrentRequestFinalURI() { nsCOMPtr<nsIURI> uri;
if (mCurrentRequest) { mCurrentRequest->GetFinalURI(getter_AddRefs(uri));
} return uri.forget(); }
^
0x1624b99 create_specialized_node
../../gcc/ipa-cp.c:3870
0x16252a2 decide_about_value<tree_node*>
../../gcc/ipa-cp.c:4699
0x1626440 decide_whether_version_node
../../gcc/ipa-cp.c:4743
0x1626440 ipcp_decision_stage
../../gcc/ipa-cp.c:4906
0x1626440 ipcp_driver
../../gcc/ipa-cp.c:5086
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Subject: [Bug middle-end/26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
Bug 26163 depends on bug 84149, which changed state.
Bug 84149 Summary: [8 Regression] SPEC CPU2017 505.mcf/605.mcf ~10% performance regression with r256888
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84149
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-601903-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 08:58:24 2018
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Subject: [Bug ipa/84149] [8 Regression] SPEC CPU2017 505.mcf/605.mcf ~10% performance regression with r256888
Date: Wed, 18 Apr 2018 08:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84149
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
Known to fail|8.0.1 |
--- Comment #14 from Martin Liška <marxin at gcc dot gnu.org> ---
New ICE has a new PR85447.
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Subject: [Bug middle-end/84016] [8 Regression] Spec2000 regression around Jan 14 and Jan 19 2018
Date: Wed, 18 Apr 2018 08:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84016
Bug 84016 depends on bug 84149, which changed state.
Bug 84149 Summary: [8 Regression] SPEC CPU2017 505.mcf/605.mcf ~10% performance regression with r256888
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84149
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-601905-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 08:58:27 2018
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Subject: [Bug other/84613] [meta-bug] SPEC compiler performance issues
Date: Wed, 18 Apr 2018 08:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84613
Bug 84613 depends on bug 84149, which changed state.
Bug 84149 Summary: [8 Regression] SPEC CPU2017 505.mcf/605.mcf ~10% performance regression with r256888
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84149
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-601906-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 09:02:11 2018
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Subject: [Bug ipa/85447] [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
Date: Wed, 18 Apr 2018 09:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85447
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
Last reconfirmed| |2018-4-18
Version|unknown |8.0.1
Known to fail| |8.0.1
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Subject: [Bug middle-end/85383] [8 regression] many ICE failures at gcc/toplev.c:325 starting with r259346
Date: Wed, 18 Apr 2018 09:03:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Patch was reverted.
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Subject: [Bug middle-end/85382] code compiled with fno-builtin uses builtin
Date: Wed, 18 Apr 2018 09:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85382
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
__powidf2 is provided by libgcc.a and thus available. -fno-builtin is not
intended to prevent GCC from emitting calls to its runtime.
>From gcc-bugs-return-601909-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 09:11:57 2018
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Wed, 18 Apr 2018 09:11:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #26 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Port is now obsolete, will be removed in GCC9 unless sufficient maintenance is
provided.
>From gcc-bugs-return-601910-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 09:14:38 2018
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Subject: [Bug rtl-optimization/85390] possible missed optimisation / regression from 6.3 with conditional expression
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-*-*, i?86-*-*
Component|tree-optimization |rtl-optimization
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think we statically predict the test to be non-even and thus avoid the cmov.
Not sure if current cores still prefer branches over cmov for well-predicted
branches.
>From gcc-bugs-return-601911-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 09:17:36 2018
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
Date: Wed, 18 Apr 2018 09:17:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-601912-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 09:26:05 2018
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Subject: [Bug libstdc++/85442] [8 Regression] cxx11-ios_failure.lo build fails for microblaze
Date: Wed, 18 Apr 2018 09:26:00 -0000
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Can be reproduced even on x86_64-linux with
CXXFLAGS='-g -O2 -D_GNU_SOURCE -gno-as-loc-support'
cxx11-ios_failure-lt.s: Assembler messages:
cxx11-ios_failure-lt.s: Fatal error: duplicate .debug_line sections
make: *** [Makefile:766: cxx11-ios_failure.lo] Error 1
Otherwise it just creates duplicate debug info.
>From gcc-bugs-return-601913-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 09:31:44 2018
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Subject: [Bug c++/80290] [6/7/8 Regression] g++ uses unreasonable amount of memory compiling nested string maps
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[6/7 Regression] g++ uses |[6/7/8 Regression] g++ uses
|unreasonable amount of |unreasonable amount of
|memory compiling nested |memory compiling nested
|string maps |string maps
--- Comment #24 from Richard Biener <rguenth at gcc dot gnu.org> ---
While memory use improved the testcase in comment#10 still shows substantial
increase in memory and time for each added init element:
1.24user 0.04system 0:01.28elapsed 100%CPU (0avgtext+0avgdata
170772maxresident)k
1.49user 0.07system 0:01.56elapsed 99%CPU (0avgtext+0avgdata
206396maxresident)k
0inputs+0outputs (0major+50914minor)pagefaults 0swaps
1.70user 0.05system 0:01.76elapsed 100%CPU (0avgtext+0avgdata
233904maxresident)k
so we improved some constant factor but didn't really address the underlying
issue.
Numbers from before the patch (on a loaded system, sorry) were
3.87user 0.10system 0:04.33elapsed 91%CPU (0avgtext+0avgdata
235760maxresident)k
0inputs+0outputs (0major+54479minor)pagefaults 0swaps
5.23user 0.16system 0:06.06elapsed 88%CPU (0avgtext+0avgdata
283860maxresident)k
0inputs+0outputs (0major+64971minor)pagefaults 0swaps
6.17user 0.15system 0:06.90elapsed 91%CPU (0avgtext+0avgdata
323796maxresident)k
0inputs+0outputs (0major+74942minor)pagefaults 0swaps
>From gcc-bugs-return-601914-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 09:37:52 2018
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Subject: [Bug libstdc++/85396] _M_t._M_emplace_hint_unique
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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> ---
It works for me with 6.2.0, 6.3.0 and 6.4.0 on x86_64-linux.
>From gcc-bugs-return-601916-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 09:43:32 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: Wed, 18 Apr 2018 09:43:00 -0000
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--- Comment #2 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #1 from Ian Lance Taylor <ian at airs dot com> ---
> Does the SPARC Solaris assembler support a syntax like
>
> .section ".go.buildid",#exclude
>
> ? That's what gas seems to support for compatibility.
It does indeed. I didn't think to look into gas docs because I couldn't
find anything in the Solaris SPARC assembler manual.
> Does that syntax work for x86?
Almost: you need
.section .go.buildid,#exclude
It's weird that they use the sparc synatx in this case instead of the
common "e" flag.
One caveat, though: #exclude wasn't present in the original Solaris 10
assemblers. However, both the current ones and the Solaris 11
assemblers do support it. While I'll handle this when adding
SHF_EXCLUDE support with Solaris as to gcc proper, I don't know if I
care enough about those ancient systems...
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Subject: [Bug fortran/85448] New: the compiler selects the wrong subroutine because of bind(c,name=...)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85448
Bug ID: 85448
Summary: the compiler selects the wrong subroutine because of
bind(c,name=...)
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: francois.jacq at irsn dot fr
Target Milestone: ---
In the following example, the subroutine c_open of the module m2, which should
call the subroutine odopen of the module m1, calls itself instead...
Tested with gcc 4.9.2 , 5.3.0, 6.3.0
result :
dev005{bug} 114 : gfortran -c m1.f90 m2.f90
dev005{bug} 114 : gcc main.c *.o -lgfortran
dev005{bug} 114 : ./a.out
c_odopen
c_odopen
c_odopen
...
module m1
implicit none
contains
subroutine odopen(unit)
integer,intent(out) :: unit
write(*,*) 'odopen'
unit=8
end subroutine
end module
module m2
use iso_c_binding
use m1
implicit none
contains
subroutine c_odopen(unit) bind(c,name="odopen")
integer(c_int),intent(out) :: unit
write(*,*) 'c_odopen'
call odopen(unit)
end subroutine
end module
#include <stdio.h>
void odopen(int*);
int main(){
int unit;
odopen(&unit);
printf("unit=%d \n",unit);
return 0;
}
>From gcc-bugs-return-601917-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 09:45:56 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 other/85398] g++ reports "array subscript is above array bounds" when it cannot be sure
Date: Wed, 18 Apr 2018 09:45:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
This is the simple case of GCC optimizing the access to a constant:
<bb 2> [50.00%]:
max.0_11 = max;
if (max.0_11 > 1)
goto <bb 3>; [50.00%]
else
goto <bb 4>; [50.00%]
<bb 3> [25.00%]:
_13 = right[0];
left[1] = _13;
<bb 4> [50.00%]:
return;
and we warn for the case of max > 1.
Similarly we warn for
int bar () { return left[2]; }
even if we can't prove that bar() is actually executed.
We could change the warning to have a "may be above array bounds" form
for your case but that wouldn't handle the bar() case.
>From gcc-bugs-return-601918-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 09:47:58 2018
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Subject: [Bug jit/85384] libgccjit does not work if --with-gcc-major-version is used
Date: Wed, 18 Apr 2018 09:47:00 -0000
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Apr 18 09:46:58 2018
New Revision: 259462
URL: https://gcc.gnu.org/viewcvs?rev=259462&root=gcc&view=rev
Log:
PR jit/85384
* acx.m4 (GCC_BASE_VER): Remove \$\$ from sed expression.
* configure.ac (gcc-driver-name.h): Honor --with-gcc-major-version
by using gcc_base_ver to generate a gcc_driver_version, and use
it when generating GCC_DRIVER_NAME.
* configure: Regenerate.
* configure: Regenerate.
Modified:
trunk/config/ChangeLog
trunk/config/acx.m4
trunk/fixincludes/ChangeLog
trunk/fixincludes/configure
trunk/gcc/ChangeLog
trunk/gcc/configure
trunk/gcc/configure.ac
trunk/libada/ChangeLog
trunk/libada/configure
trunk/libatomic/ChangeLog
trunk/libatomic/configure
trunk/libcc1/ChangeLog
trunk/libcc1/configure
trunk/libffi/ChangeLog
trunk/libffi/configure
trunk/libgcc/ChangeLog
trunk/libgcc/configure
trunk/libgfortran/ChangeLog
trunk/libgfortran/configure
trunk/libgomp/ChangeLog
trunk/libgomp/configure
trunk/libhsail-rt/ChangeLog
trunk/libhsail-rt/configure
trunk/libitm/ChangeLog
trunk/libitm/configure
trunk/libmpx/ChangeLog
trunk/libmpx/configure
trunk/libobjc/ChangeLog
trunk/libobjc/configure
trunk/liboffloadmic/ChangeLog
trunk/liboffloadmic/configure
trunk/liboffloadmic/plugin/configure
trunk/libquadmath/ChangeLog
trunk/libquadmath/configure
trunk/libsanitizer/ChangeLog
trunk/libsanitizer/configure
trunk/libssp/ChangeLog
trunk/libssp/configure
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/configure
trunk/libvtv/ChangeLog
trunk/libvtv/configure
trunk/lto-plugin/ChangeLog
trunk/lto-plugin/configure
>From gcc-bugs-return-601919-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 09:51:18 2018
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Subject: [Bug jit/85384] libgccjit does not work if --with-gcc-major-version is used
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Richard prefered David's patch and we have some sed invocations that expect
s/something.*// to match everything until end of line in gcc/Makefile.in, so if
some sed versions don't do it, it would break other things.
So, fixed for GCC8+ so far, should be backported to 7 at some point.
>From gcc-bugs-return-601920-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 09:53:19 2018
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Subject: [Bug lto/85405] [6/7 Regression] ICE in odr_types_equivalent_p, at ipa-devirt.c:1581
Date: Wed, 18 Apr 2018 09:53:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug tree-optimization/85406] Unnecessary blend when vectorizing short-cutted calculations
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-04-18
CC| |rguenth at gcc dot gnu.org
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I don't see any vectorization being done on the testcase. Please specify the
GCC version you tested as well as the command-line flags and eventually
complete the testcase (there's no loop here?).
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Subject: [Bug ipa/85447] [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
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Martin Jambor <jamborm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Confirmed and I guess mine.
>From gcc-bugs-return-601923-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 10:01:48 2018
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Subject: [Bug ipa/85447] [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Reduced test-case:
typedef int a;
enum b : a;
class c {
public:
enum { d };
virtual b e(int *, int, const int *) = 0;
};
class f : c {
b e(int *, int, const int *);
b g();
};
b f::e(int *h, int i, const int *j) {
if (i == d)
return g();
for (;;)
e(h, i, j);
}
int k;
c *l;
void m() { l->e(&k, c::d, nullptr); }
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Subject: [Bug rtl-optimization/85409] [8/9 Regression] ICE in alloc_succs_info, at sel-sched-ir.c:4730
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |deferred
Priority|P3 |P2
Target Milestone|8.0 |9.0
Summary|[8 Regression] ICE in |[8/9 Regression] ICE in
|alloc_succs_info, at |alloc_succs_info, at
|sel-sched-ir.c:4730 |sel-sched-ir.c:4730
>From gcc-bugs-return-601925-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 10:03:59 2018
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From: "patrickdepinguin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug other/85398] g++ reports "array subscript is above array bounds" when it cannot be sure
Date: Wed, 18 Apr 2018 10:03:00 -0000
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--- Comment #3 from Thomas De Schampheleire <patrickdepinguin at gmail dot com> ---
(In reply to Richard Biener from comment #2)
>
> We could change the warning to have a "may be above array bounds" form
> for your case but that wouldn't handle the bar() case.
The problem with giving warnings about potential-but-not-definite issues is
that projects that compile with '-Wall -Werror' assume zero warnings to guard
quality.
But if some warnings are false-positives, this strategy no longer works. The
project will fail to compile even though it is perfectly fine.
You'd need a way to tell gcc that this code is fine, or put such cases in a
separate warning category that is not included in Wall or can be disabled
explicitly.
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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++/84611] [6/7/8 Regression] ICE in operator[], at vec.h:826 (local_class_index())
Date: Wed, 18 Apr 2018 10:05:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |paolo.carlini at oracle dot com
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
On it.
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Subject: [Bug rtl-optimization/85412] [8/9 Regression] ICE in put_TImodes, at sel-sched.c:7191
Date: Wed, 18 Apr 2018 10:06:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |deferred
Priority|P3 |P2
Target Milestone|--- |9.0
Summary|[8 Regression] ICE in |[8/9 Regression] ICE in
|put_TImodes, at |put_TImodes, at
|sel-sched.c:7191 |sel-sched.c:7191
>From gcc-bugs-return-601928-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 10:18:19 2018
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Subject: [Bug ipa/85447] [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
Date: Wed, 18 Apr 2018 10:18:00 -0000
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Martin Jambor <jamborm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |hubicka at gcc dot gnu.org
--- Comment #3 from Martin Jambor <jamborm at gcc dot gnu.org> ---
The problem here is that IPA-CP clones node cgraph_edge Notify/1680
which has a speculative self-recursive edge. Because it now needs to
make sure that eventually clones of such edges call the node clone and
not the original node (while the original edge is not redirected and
still leads to the original node), it takes such edges out of
redirect_callers and stores in a vector to deal with post-cloning.
Normally, after create_virtual_clone returns, it walks this vector,
finds clones of these self-recursive edges in array next_edge_clone
because that is where they are linked by ipcp_edge_duplication_hook,
and redirects the clone.
However, in this case, before create_virtual_clone returns
ipa_fn_summary_t::duplicate is invoked and it re-evaluates edge
predicates, during which it decides the edge is impossible, which
leads to speculation resolution removing the new edge, clone,
ipcp_edge_removal_hook being invoked which deletes it from the linked
list of edge clones and subsequently ipa-cp code not finding it there.
Breakpoint 6, ipcp_edge_removal_hook (cs=<cgraph_edge Notify.constprop/7327 ->
Notify/1680>)
at /home/mjambor/gcc/icln/src/gcc/ipa-cp.c:3435
3435 grow_edge_clone_vectors ();
(gdb) bt
#0 ipcp_edge_removal_hook (cs=<cgraph_edge Notify.constprop/7327 ->
Notify/1680>)
at /home/mjambor/gcc/icln/src/gcc/ipa-cp.c:3435
#1 0x0000000000be7669 in symbol_table::call_edge_removal_hooks
(this=0x7ffff67aa100,
e=<cgraph_edge Notify.constprop/7327 -> Notify/1680>) at
/home/mjambor/gcc/icln/src/gcc/cgraph.c:329
#2 0x0000000000be8e66 in cgraph_edge::remove (this=<cgraph_edge
Notify.constprop/7327 -> Notify/1680>)
at /home/mjambor/gcc/icln/src/gcc/cgraph.c:1028
#3 0x0000000000be94c0 in cgraph_edge::resolve_speculation (
this=<cgraph_edge Notify.constprop/7327 -> Notify/1680>,
callee_decl=<function_decl 0x7ffff68a2900 __builtin_unreachable>)
at /home/mjambor/gcc/icln/src/gcc/cgraph.c:1200
#4 0x0000000000eb8f97 in redirect_to_unreachable (e=<cgraph_edge
Notify.constprop/7327 -> Notify/1680>)
at /home/mjambor/gcc/icln/src/gcc/ipa-fnsummary.c:239
#5 0x0000000000eb90a0 in edge_set_predicate (e=<cgraph_edge
Notify.constprop/7327 -> Notify/1680>,
predicate=0x7fffffffd680) at
/home/mjambor/gcc/icln/src/gcc/ipa-fnsummary.c:267
#6 0x0000000000eba5ef in ipa_fn_summary_t::duplicate (this=0x7fffe7c702a0,
src=<symtab_function 0x7fffec0cb170 Notify/1680>,
dst=<symtab_function 0x7ffff519c5c0 Notify.constprop/7327>,
info=0x7fffe7c54e70)
at /home/mjambor/gcc/icln/src/gcc/ipa-fnsummary.c:714
#7 0x0000000000ec7339 in function_summary<ipa_fn_summary*>::symtab_duplication
(
node=<symtab_function 0x7fffec0cb170 Notify/1680>,
node2=<symtab_function 0x7ffff519c5c0 Notify.constprop/7327>,
data=0x7fffe7c702a0)
at /home/mjambor/gcc/icln/src/gcc/symbol-summary.h:189
#8 0x0000000000be7b2c in symbol_table::call_cgraph_duplication_hooks
(this=0x7ffff67aa100,
node=<symtab_function 0x7fffec0cb170 Notify/1680>,
node2=<symtab_function 0x7ffff519c5c0 Notify.constprop/7327>)
at /home/mjambor/gcc/icln/src/gcc/cgraph.c:495
#9 0x0000000000c04800 in cgraph_node::create_virtual_clone (
this=<symtab_function 0x7fffec0cb170 Notify/1680>, redirect_callers=...,
tree_map=0x7fffee721370,
args_to_skip=0x7fffef8570c0, suffix=0x24396e0 "constprop")
at /home/mjambor/gcc/icln/src/gcc/cgraphclones.c:618
#10 0x0000000001bf5341 in create_specialized_node (node=<symtab_function
0x7fffec0cb170 Notify/1680>,
known_csts=..., known_contexts=..., aggvals=0x0, callers=...)
at /home/mjambor/gcc/icln/src/gcc/ipa-cp.c:3863
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Subject: [Bug lto/85422] [openacc] ICE at cfgloop.c:468: segfault in flow_loops_find
Date: Wed, 18 Apr 2018 10:19:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
flags? A simple ./xgcc -fopenacc doesn't reproduce it. With my GCC 7 install
I see
lto-wrapper: fatal error: problem with building target image for nvptx-none
but no way to see the lto1 invocations :/ (tried -Wl,-debug -Wl,-v already)
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Subject: [Bug rtl-optimization/85423] [8 Regression] ICE in code_motion_process_successors, at sel-sched.c:6403
Date: Wed, 18 Apr 2018 10:20:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Recent regression, so P1-ish.
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Subject: [Bug rtl-optimization/85423] [8 Regression] ICE in code_motion_process_successors, at sel-sched.c:6403
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
> Recent regression, so P1-ish.
True, but requires the -fselective-scheduling* -fvar-tracking-assignments
combination, which explicitly warns that it doesn't work properly (and doesn't)
and I think people rarely use either of those options and even less likely both
of them together.
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Subject: [Bug c/85427] ICE in constant_lower_bound, at poly-int.h:1527
Date: Wed, 18 Apr 2018 10:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85427
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
CC| |rsandifo at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think Richard had a patch for this or a related issue.
>From gcc-bugs-return-601933-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 10:26:36 2018
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Subject: [Bug ipa/85447] [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
Date: Wed, 18 Apr 2018 10:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85447
--- Comment #4 from Martin Jambor <jamborm at gcc dot gnu.org> ---
I guess the best fix is to move the clone-redirecting logic to
cgraph::create_clone.
>From gcc-bugs-return-601934-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 10:29:25 2018
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Subject: [Bug lto/85422] [openacc] ICE at cfgloop.c:468: segfault in flow_loops_find
Date: Wed, 18 Apr 2018 10:29:00 -0000
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--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 43975
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libgomp.log
>From gcc-bugs-return-601935-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 10:31:54 2018
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Subject: [Bug lto/85422] [openacc] ICE at cfgloop.c:468: segfault in flow_loops_find
Date: Wed, 18 Apr 2018 10:31:00 -0000
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--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
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compile.log
-save-temps -v output. Contains lto1 invocation.
>From gcc-bugs-return-601937-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 10:32:29 2018
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Subject: [Bug ipa/85449] New: [8 Regression] Wrong specialization is called in self recursive functions after r259319
Date: Wed, 18 Apr 2018 10:32:00 -0000
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Bug ID: 85449
Summary: [8 Regression] Wrong specialization is called in self
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preprocessed file
After commit r259319 IPA seems to be calling the wrong specialized function.
The testcase comes from the following library
https://github.com/akheron/jansson, specifically this file
https://github.com/akheron/jansson/blob/master/src/dump.c
I have not been able to reduce it yet as I have no real easy way to check when
it does the replacement wrong but I have attached a `.i` file and issue can be
reproduced using it by using `-Ofast` or `-O3`.
This is what I have been able to tell so far. The issue is caused by a self
recursive call in the function
static int do_dump(const json_t *json, size_t flags, int depth,
json_dump_callback_t dump, void *data)
where json_dump_callback_t dump is a function pointer to local functions. There
are only two call sites for do_dump other than itself.
char *json_dumps(const json_t *json, size_t flags)
{
strbuffer_t strbuff;
char *result;
if(strbuffer_init(&strbuff))
return NULL;
if(json_dump_callback(json, dump_to_strbuffer, (void *)&strbuff, flags))
result = NULL;
else
result = jsonp_strdup(strbuffer_value(&strbuff));
strbuffer_close(&strbuff);
return result;
}
int json_dumpf(const json_t *json, FILE *output, size_t flags)
{
return json_dump_callback(json, dump_to_file, (void *)output, flags);
}
where dump_to_strbuffer expects to write into a memory buffer and dump_to_file
writing to an actual file.
So IPA decides to create 8 specializations for this function (whereas before
this patch it created 4.), it creates them by amongst others inlining the calls
to these two dump callbacks, and eventually even inlines the callbacks
themselves.
The problematic specialization occurs for the function {{do_dumps}} which has
amonst others
.LVL289:
.loc 1 368 24
fmov x4, d8
mov x3, x19
mov w2, 1
mov x1, x21
bl do_dump
The first specialization occurs when a helper function {{dump_indent}} is
inline, creating {{do_dumps.constprop.4}} which is supposed to still take the
callbacks as arguments.
and indeed looking at the assembly is shows
json_dumps:
...
.L260:
adrp x2, dump_to_strbuffer
mov x1, x20
mov x0, x19
add x3, sp, 40
.LVL440:
add x2, x2, :lo12:dump_to_strbuffer
bl do_dump.constprop.4
so far so good. But the recursive call to do_dump in the specialized
constprop.4 version inexplicably calls do_dump.constprop.5 in some (2 out of
the many) cases.
Where do_dump.constprop.5 is a more specialized version of constprop.4 which
also inlined the dump_to_file function.
do_dump.constprop.5:
...
add x0, x0, :lo12:.LC14
mov x1, 4
bl fwrite
So the initial callback which is passed is dump_to_strbuffer is ignored and a
call to dump_to_file is essentially made. causing a segfault.
The first place this seems to go wrong is `.i.075i.cp`
looking at the dependencies of `constprop.4/82` which is supposed to be the
generic clone
do_dump.constprop.4/82 (do_dump.constprop) @0x7ff4280128a0
...
Calls: json_integer_value/55 (119292717 (estimated locally),0.11 per call)
snprintf/56 (119292717 (estimated locally),0.11 per call) json_real_value/57
(119292717 (estimated locally),0.11 per call) jsonp_dtostr/58 (119292717
(estimated locally),0.11 per call) json_string_value/59 (119292717 (estimated
locally),0.11 per call) dump_string/39 (119292717 (estimated locally),0.11 per
call) json_array_size/60 (116799499 (estimated locally),0.11 per call)
dump_indent.constprop/85 (56497842 (estimated locally),0.05 per call)
json_array_get/61 (341791464 (estimated locally),0.32 per call)
do_dump.constprop/83 (341791464 (estimated locally),0.32 per call)
dump_indent.constprop/85 (244621272 (estimated locally),0.23 per call)
dump_indent/38 (70872647 (estimated locally),0.07 per call) json_object_iter/62
(116799499 (estimated locally),0.11 per call) dump_indent.constprop/85
(79811293 (estimated locally),0.07 per call) json_object_size/63 (26063814
(estimated locally),0.02 per call) jsonp_malloc/64 (26063814 (estimated
locally),0.02 per call) jsonp_object_iter_fullkey/65 (209930993 (estimated
locally),0.20 per call) json_object_iter_next/66 (209930993 (estimated
locally),0.20 per call) __assert_fail/67 (10379 (estimated locally),0.00 per
call) qsort/69 (25936149 (estimated locally),0.02 per call) json_object_get/70
(181163084 (estimated locally),0.17 per call) __assert_fail/67 (72465
(estimated locally),0.00 per call) dump_string/39 (181090619 (estimated
locally),0.17 per call) do_dump.constprop/83 (175404373 (estimated
locally),0.16 per call) <--- this reference is wrong
jsonp_free/71 (11193943 (estimated locally),0.01 per call)
dump_indent.constprop/85 (110256487 (estimated locally),0.10 per call)
jsonp_free/71 (7036340 (estimated locally),0.01 per call) dump_indent/38
(56065903 (estimated locally),0.05 per call) jsonp_free/71 (1760469 (estimated
locally),0.00 per call) jsonp_free/71 (5872931 (estimated locally),0.01 per
call) json_object_iter_next/66 (309742814 (estimated locally),0.29 per call)
json_object_iter_key/72 (309742814 (estimated locally),0.29 per call)
dump_string/39 (309742814 (estimated locally),0.29 per call)
json_object_iter_value/73 (298406227 (estimated locally),0.28 per call)
do_dump.constprop/83 (298406227 (estimated locally),0.28 per call)
dump_indent.constprop/85 (228688039 (estimated locally),0.21 per call)
dump_indent/38 (50108559 (estimated locally),0.05 per call)
...
But I have not figured out why it thinks this.
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85444] asm specifier on typedef silently ignored
Date: Wed, 18 Apr 2018 10:32:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
For a start, patches go to the mailing list, not in bugzilla :-)
https://gcc.gnu.org/contribute.html
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Subject: [Bug lto/85422] [openacc] ICE at cfgloop.c:468: segfault in flow_loops_find
Date: Wed, 18 Apr 2018 10:36:00 -0000
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--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 43978
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configure lines
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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/84149] [8 Regression] SPEC CPU2017 505.mcf/605.mcf ~10% performance regression with r256888
Date: Wed, 18 Apr 2018 10:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84149
Tamar Christina <tnfchris at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |tnfchris at gcc dot gnu.org
--- Comment #15 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Hi All,
I created a new issue PR85449 that occurs after this change. IPA seems to be
mixing up some of the recursive calls in a specialized function causing an
invalid code path.
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85436] [7 Regression] ICE compiling go code with -mcpu=power9
Date: Wed, 18 Apr 2018 10:39:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-601941-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 10:40:39 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85437] [8 Regression] member pointer static upcast rejected in a constexpr context
Date: Wed, 18 Apr 2018 10:40:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-601942-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 10:45:53 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 libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Wed, 18 Apr 2018 10:45:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Known to work| |8.0
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Only snapshots though a release (candiate) is not far away.
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85441] Empty loops not optimised away
Date: Wed, 18 Apr 2018 10:47:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed with -fsyntax-only, generating code doesn't change things much.
>From gcc-bugs-return-601943-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 10:47:19 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
Date: Wed, 18 Apr 2018 10:47:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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CC| |mjambor at suse dot cz
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/85442] [8 Regression] cxx11-ios_failure.lo build fails for microblaze
Date: Wed, 18 Apr 2018 10:49:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug target/85443] internal compiler error: Segmentation fault
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 5.5 is no longer maintained, please try a newer version, preferably GCC 7.3
or a snapshot from trunk (GCC 8).
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Subject: [Bug c++/85444] asm specifier on typedef silently ignored
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug tree-optimization/85446] [7/8 Regression] wrong-code on riscv64
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85446
Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |wrong-code
Priority|P3 |P2
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Subject: [Bug c++/85444] asm specifier on typedef silently ignored
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, it could maybe used to adjust mangling... (in C++, that is).
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Subject: [Bug ipa/85447] [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug c++/85396] _M_t._M_emplace_hint_unique
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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> ---
Also works fine at https://godbolt.org/g/xfSvy5 with:
GNU C++11 (crosstool-NG crosstool-ng-1.23.0) version 6.3.0
(arm-unknown-linux-gnueabi)
So this might be due to a patch backported to Debian's GCC, and would need to
be reported to Debian.
It's certainly not a libstdc++ bug because the preprocessed source compiles
fine on i686-linux.
(In reply to microprogs from comment #0)
> // C++11: ERROR, cannot compile
> //g++ -std=c++11 -o test test.cpp
> //
> // C++14: OK
> //g++ -std=c++14 -o test test.cpp
> //
> // old C++: OK
> //g++ -o test test.cpp
N.B. this is not "old C++" this is -std=gnu++14, because that's the default in
GCC 6.x
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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> ---
Thanks, this should be fixed on trunk now.
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Subject: [Bug libstdc++/84442] FAIL: 30_threads/thread/cons/terminate.cc (test for excess errors)
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Apr 18 11:15:38 2018
New Revision: 259463
URL: https://gcc.gnu.org/viewcvs?rev=259463&root=gcc&view=rev
Log:
PR libstdc++/84442 if _Exit isn't declared then use _exit instead
PR libstdc++/84442
* testsuite/30_threads/thread/cons/terminate.cc
[!_GLIBCXX_USE_C99_STDLIB] : Use _exit or std::exit instead of _Exit.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/testsuite/30_threads/thread/cons/terminate.cc
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Subject: [Bug ipa/85447] [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
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--- Comment #5 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Created attachment 43979
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43979&action=edit
Untested WIP fix
I have to leave office for a few hours, I'm attaching an untested fix I have so
far. I will continue with it after I try to reproduce PR 85449 (which on the
face of it looks more sinister).
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Subject: [Bug lto/85422] [openacc] ICE at cfgloop.c:468: segfault in flow_loops_find
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Tom de Vries <vries at gcc dot gnu.org> changed:
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CC| |tschwinge at gcc dot gnu.org
--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #3)
> flags? A simple ./xgcc -fopenacc doesn't reproduce it. With my GCC 7
> install I see
>
> lto-wrapper: fatal error: problem with building target image for nvptx-none
>
> but no way to see the lto1 invocations :/ (tried -Wl,-debug -Wl,-v already)
I ran into the same problem when trying to use an installed compiler. Fixed by
adding -B options for:
- the dir containing accel/nvptx-none/mkoffload
- the dir containing the offload gcc (in my case,
x86_64-pc-linux-gnu-accel-nvptx-none-gcc)
So:
...
$ ./install/bin/x86_64-pc-linux-gnu-gcc \
-fopenacc \
src/libgomp/testsuite/libgomp.oacc-c-c++-common/pr85422.c \
-B $(pwd -P)/install/offload-nvptx-none/bin \
-B $(pwd -P)/install/offload-nvptx-none/libexec/gcc/x86_64-pc-linux-gnu/8.0.1
...
The error message could certainly be be better.
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Subject: [Bug libstdc++/85442] [7/8 Regression] cxx11-ios_failure.lo build fails for microblaze
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85442
Joseph S. Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|8.0 |7.4
Summary|[8 Regression] |[7/8 Regression]
|cxx11-ios_failure.lo build |cxx11-ios_failure.lo build
|fails for microblaze |fails for microblaze
--- Comment #3 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Appears on GCC 7 branch as well as the patch was backported there (my bot only
rebuilds release branch compilers weekly, so it was slower to show the failure
there).
https://sourceware.org/ml/libc-testresults/2018-q2/msg00078.html
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85441] Empty loops not optimised away
Date: Wed, 18 Apr 2018 11:26:00 -0000
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--- Comment #3 from sebastian321123 at interia dot pl ---
I am afraid that nothing changes with optimisation flags. I am getting the same
results for -O1, -O2, -O3 and -Os
>From gcc-bugs-return-601959-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 11:30:23 2018
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
Date: Wed, 18 Apr 2018 11:30:00 -0000
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--- Comment #17 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Author: hubicka
Date: Wed Apr 18 11:29:26 2018
New Revision: 259464
URL: https://gcc.gnu.org/viewcvs?rev=259464&root=gcc&view=rev
Log:
PR lto/85391
* lto.c (lto_read_decls): Do not test TYPE_CANONICAL before registering
odr
types.
* g++.dg/lto/pr83121_0.C: Update template.
* g++.dg/lto/pr83121_1.C: Update template.
* g++.dg/lto/pr84805_0.C: Update template.
* g++.dg/lto/pr84805_1.C: Update template.
* g++.dg/lto/pr84805_2.C: Update template.
Modified:
trunk/gcc/lto/ChangeLog
trunk/gcc/lto/lto.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/lto/pr83121_0.C
trunk/gcc/testsuite/g++.dg/lto/pr83121_1.C
trunk/gcc/testsuite/g++.dg/lto/pr84805_0.C
trunk/gcc/testsuite/g++.dg/lto/pr84805_1.C
trunk/gcc/testsuite/g++.dg/lto/pr84805_2.C
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Subject: [Bug libstdc++/85442] [7/8 Regression] cxx11-ios_failure.lo build fails for microblaze
Date: Wed, 18 Apr 2018 11:34:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, the branch will need the same fix.
>From gcc-bugs-return-601961-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 11:42:47 2018
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Subject: [Bug target/85261] __builtin_arm_set_fpscr ICEs with constant input
Date: Wed, 18 Apr 2018 11:42:00 -0000
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--- Comment #5 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
Author: thopre01
Date: Wed Apr 18 11:42:10 2018
New Revision: 259465
URL: https://gcc.gnu.org/viewcvs?rev=259465&root=gcc&view=rev
Log:
[ARM] Fix PR85261: ICE with FPSCR setter builtin
Instruction pattern for setting the FPSCR expects the input value to be
in a register. However, __builtin_arm_set_fpscr expander does not ensure
that this is the case and as a result GCC ICEs when the builtin is
called with a constant literal.
This commit fixes the builtin to force the input value into a register.
It also remove the unneeded volatile in the existing fpscr test and
fixes the function prototype.
2018-04-18 Thomas Preud'homme <thomas.preudhomme@arm.com>
Backport from mainline
2018-04-11 Thomas Preud'homme <thomas.preudhomme@arm.com>
gcc/
PR target/85261
* config/arm/arm-builtins.c (arm_expand_builtin): Force input operand
into register.
gcc/testsuite/
PR target/85261
* gcc.target/arm/fpscr.c: Add call to __builtin_arm_set_fpscr with
literal value. Expect 2 MCR instruction. Fix function prototype.
Remove volatile keyword.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/arm/arm-builtins.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
branches/gcc-7-branch/gcc/testsuite/gcc.target/arm/fpscr.c
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Subject: [Bug libgcc/85379] Missing ENDBR in __stack_split_initialize
Date: Wed, 18 Apr 2018 11:47:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-18
CC| |igor.v.tsimbalist at intel dot com
| |, ubizjak at gmail dot com
Ever confirmed|0 |1
>From gcc-bugs-return-601963-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 11:52:09 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 middle-end/85450] New: ICE: invalid types in nop conversion during GIMPLE pass: ompexp
Date: Wed, 18 Apr 2018 11:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85450
Bug ID: 85450
Summary: ICE: invalid types in nop conversion during GIMPLE
pass: ompexp
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: openmp
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
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CC: jakub at gcc dot gnu.org
Target Milestone: ---
I see
Running target unix//-m32
FAIL: libgomp.c/for-3.c (internal compiler error)
FAIL: libgomp.c/for-3.c (test for excess errors)
UNRESOLVED: libgomp.c/for-3.c compilation failed to produce executable
FAIL: libgomp.c/for-5.c (internal compiler error)
FAIL: libgomp.c/for-5.c (test for excess errors)
UNRESOLVED: libgomp.c/for-5.c compilation failed to produce executable
FAIL: libgomp.c/for-6.c (internal compiler error)
FAIL: libgomp.c/for-6.c (test for excess errors)
UNRESOLVED: libgomp.c/for-6.c compilation failed to produce executable
FAIL: libgomp.c++/for-11.C (internal compiler error)
FAIL: libgomp.c++/for-11.C (test for excess errors)
UNRESOLVED: libgomp.c++/for-11.C compilation failed to produce executable
FAIL: libgomp.c++/for-13.C (internal compiler error)
FAIL: libgomp.c++/for-13.C (test for excess errors)
UNRESOLVED: libgomp.c++/for-13.C compilation failed to produce executable
FAIL: libgomp.c++/for-14.C (internal compiler error)
FAIL: libgomp.c++/for-14.C (test for excess errors)
UNRESOLVED: libgomp.c++/for-14.C compilation failed to produce executable
with the following fix for the r177828 change:
Index: gcc/tree-cfg.c
===================================================================
--- gcc/tree-cfg.c (revision 259457)
+++ gcc/tree-cfg.c (working copy)
@@ -3842,7 +3842,7 @@ verify_gimple_assign_unary (gassign *stm
|| (POINTER_TYPE_P (rhs1_type)
&& INTEGRAL_TYPE_P (lhs_type)
&& (TYPE_PRECISION (rhs1_type) >= TYPE_PRECISION (lhs_type)
- || ptrofftype_p (sizetype))))
+ || ptrofftype_p (lhs_type))))
return false;
/* Allow conversion from integral to offset type and vice versa. */
One example is
/space/rguenther/src/svn/trunk/libgomp/testsuite/libgomp.c/for-2.h: In function
'f13_dpf_guided32':^M
/space/rguenther/src/svn/trunk/libgomp/testsuite/libgomp.c/for-2.h:193:10:
error: invalid types in nop conversion^M
long long unsigned int^M
int[1500] *^M
D.13174 = (long long unsigned int) D.13222;^M
so we're casting a 32bit pointer to a 64bit int which we don't allow since
we do not know how to extend the pointer at the GIMPLE level (we really
don't want to use POINTERS_EXTEND_UNSIGNED there but rely on TYPE_UNSIGNED).
The question is what the ompexp code wants here anyway.
The fix is to do an intermediate conversion to a pointer-sized integral type.
>From gcc-bugs-return-601964-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 12:11:52 2018
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Subject: [Bug middle-end/85450] ICE: invalid types in nop conversion during GIMPLE pass: ompexp
Date: Wed, 18 Apr 2018 12:11:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2018-04-18
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
For for-3.c it is:
static void
expand_omp_for_static_nochunk (struct omp_region *region,
struct omp_for_data *fd,
gimple *inner_stmt)
{
...
if (POINTER_TYPE_P (type))
t = fold_build_pointer_plus (n1, t);
else
t = fold_build2 (PLUS_EXPR, type, t, n1);
t = fold_convert (TREE_TYPE (startvar), t);
where a fix could be to do
Index: omp-expand.c
===================================================================
--- omp-expand.c (revision 259457)
+++ omp-expand.c (working copy)
@@ -3501,7 +3501,10 @@ expand_omp_for_static_nochunk (struct om
t = fold_convert (itype, s0);
t = fold_build2 (MULT_EXPR, itype, t, step);
if (POINTER_TYPE_P (type))
- t = fold_build_pointer_plus (n1, t);
+ {
+ t = fold_build_pointer_plus (n1, t);
+ t = fold_convert (unsigned_type_for (TREE_TYPE (n1)), t);
+ }
else
t = fold_build2 (PLUS_EXPR, type, t, n1);
t = fold_convert (TREE_TYPE (startvar), t);
but there are likely a few "copies" of the code. The for-3.c testcase
also exercises the following spot:
@@ -3515,7 +3518,10 @@ expand_omp_for_static_nochunk (struct om
t = fold_convert (itype, e0);
t = fold_build2 (MULT_EXPR, itype, t, step);
if (POINTER_TYPE_P (type))
- t = fold_build_pointer_plus (n1, t);
+ {
+ t = fold_build_pointer_plus (n1, t);
+ t = fold_convert (unsigned_type_for (TREE_TYPE (n1)), t);
+ }
else
t = fold_build2 (PLUS_EXPR, type, t, n1);
t = fold_convert (TREE_TYPE (startvar), t);
and that's still not enough to fix it fully...
Note that I think even for GENERIC using fold_convert the original way
is wrong. Given fold_convert is "interesting" we might consider using
POINTERS_EXTEND_UNSIGNED there... (ok, I didn't suggest that).
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Subject: [Bug libstdc++/85442] [7/8 Regression] cxx11-ios_failure.lo build fails for microblaze
Date: Wed, 18 Apr 2018 12:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85442
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Apr 18 12:14:58 2018
New Revision: 259467
URL: https://gcc.gnu.org/viewcvs?rev=259467&root=gcc&view=rev
Log:
PR libstdc++/85442 fix duplicate debuginfo for cxx11-ios_failure.cc
2018-04-18 Jonathan Wakely <jwakely@redhat.com>
Jakub Jelinek <jakub@redhat.com>
PR libstdc++/85442
* src/c++11/Makefile.am: Don't generate debuginfo again for
cxx11-ios_failure-lt.s and cxx11-ios_failure.s files.
* src/c++11/Makefile.in: Regenerate.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/src/c++11/Makefile.am
trunk/libstdc++-v3/src/c++11/Makefile.in
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Subject: [Bug lto/85451] New: [offloading] Improve lto-wrapper error message when not finding mkoffload
Date: Wed, 18 Apr 2018 12:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85451
Bug ID: 85451
Summary: [offloading] Improve lto-wrapper error message when
not finding mkoffload
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
CC: marxin at gcc dot gnu.org
Target Milestone: ---
When using an installed host/offloading compiler, you may run into this error
message:
...
$ ./install/bin/x86_64-pc-linux-gnu-gcc -fopenacc test.c
lto-wrapper: fatal error: problem with building target image for nvptx-none
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
...
This means that mkoffload could not be found.
By providing -B with the path to accel/nvptx-none/mkoffload, we get past the
rror:
...
$ ./install/bin/x86_64-pc-linux-gnu-gcc -fopenacc test.c \
-B $(pwd -P)/install/offload-nvptx-none/libexec/gcc/x86_64-pc-linux-gnu/8.0.1
mkoffload: fatal error: offload compiler
x86_64-pc-linux-gnu-accel-nvptx-none-gcc not found
compilation terminated.
lto-wrapper: fatal error:
/home/vries/oacc/trunk/install/offload-nvptx-none/libexec/gcc/x86_64-pc-linux-gnu/8.0.1//accel/nvptx-none/mkoffload
returned 1 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
...
And by providing another -B with the path to
x86_64-pc-linux-gnu-accel-nvptx-none-gcc, we finally succeed:
...
$ ./install/bin/x86_64-pc-linux-gnu-gcc -fopenacc test.c \
-B $(pwd -P)/install/offload-nvptx-none/bin \
-B$(pwd -P)/install/offload-nvptx-none/libexec/gcc/x86_64-pc-linux-gnu/8.0.1
$
...
From the last error message, it's easy to figure out that
x86_64-pc-linux-gnu-accel-nvptx-none-gcc cannot be found (though it doesn't
suggest using -B to fix that).
But from the first error message, it's impossible to know what's going wrong
without stepping with gdb through lto-wrapper.
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Subject: [Bug lto/85451] [offloading] Improve lto-wrapper error message when not finding mkoffload
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--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 43980
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43980&action=edit
Tentative patch
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Subject: [Bug lto/85451] [offloading] Improve lto-wrapper error message when not finding mkoffload
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--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #1)
> Created attachment 43980 [details]
> Tentative patch
Improved error message:
...
$ ./install/bin/x86_64-pc-linux-gnu-gcc -fopenacc test.c
lto-wrapper: fatal error: could not find accel/nvptx-none/mkoffload in
/home/vries/oacc/trunk/install/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.1/:/home/vries/oacc/trunk/install/bin/../libexec/gcc/
(use -B?)
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
...
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Subject: [Bug lto/85422] [openacc] ICE at cfgloop.c:468: segfault in flow_loops_find
Date: Wed, 18 Apr 2018 12:29:00 -0000
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--- Comment #8 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #7)
> (In reply to Richard Biener from comment #3)
> > flags? A simple ./xgcc -fopenacc doesn't reproduce it. With my GCC 7
> > install I see
> >
> > lto-wrapper: fatal error: problem with building target image for nvptx-none
> >
> > but no way to see the lto1 invocations :/ (tried -Wl,-debug -Wl,-v already)
>
> The error message could certainly be be better.
Filed as PR85451 - "[offloading] Improve lto-wrapper error message when not
finding mkoffload"
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Subject: [Bug lto/85451] [offloading] Improve lto-wrapper error message when not finding mkoffload
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--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> ...
> $ ./install/bin/x86_64-pc-linux-gnu-gcc -fopenacc test.c \
> -B $(pwd
> -P)/install/offload-nvptx-none/libexec/gcc/x86_64-pc-linux-gnu/8.0.1
> mkoffload: fatal error: offload compiler
> x86_64-pc-linux-gnu-accel-nvptx-none-gcc not found
> compilation terminated.
> lto-wrapper: fatal error:
> /home/vries/oacc/trunk/install/offload-nvptx-none/libexec/gcc/x86_64-pc-
> linux-gnu/8.0.1//accel/nvptx-none/mkoffload returned 1 exit status
> compilation terminated.
> /usr/bin/ld: error: lto-wrapper failed
> collect2: error: ld returned 1 exit status
> ...
> From the last error message, it's easy to figure out that
> x86_64-pc-linux-gnu-accel-nvptx-none-gcc cannot be found (though it doesn't
> suggest using -B to fix that).
Which is fixed by:
...
diff --git a/gcc/config/nvptx/mkoffload.c b/gcc/config/nvptx/mkoffload.c
index c0093909448..097446c5db6 100644
--- a/gcc/config/nvptx/mkoffload.c
+++ b/gcc/config/nvptx/mkoffload.c
@@ -454,7 +454,7 @@ main (int argc, char **argv)
if (!found)
fatal_error (input_location,
- "offload compiler %s not found", GCC_INSTALL_NAME);
+ "offload compiler %s not found (use -B?)", GCC_INSTALL_NAME);
/* We may be called with all the arguments stored in some file and
passed with @file. Expand them into argv before processing. */
...
which gives us:
...
$ ./install/bin/x86_64-pc-linux-gnu-gcc -fopenacc test.c -B$(pwd
-P)/install/offload-nvptx-none/libexec/gcc/x86_64-pc-linux-gnu/8.0.1
mkoffload: fatal error: offload compiler
x86_64-pc-linux-gnu-accel-nvptx-none-gcc not found (use -B?)
compilation terminated.
lto-wrapper: fatal error:
/home/vries/oacc/trunk/install/offload-nvptx-none/libexec/gcc/x86_64-pc-linux-gnu/8.0.1//accel/nvptx-none/mkoffload
returned 1 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
...
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Subject: [Bug lto/85422] [openacc] ICE at cfgloop.c:468: segfault in flow_loops_find
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-18
Ever confirmed|0 |1
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed with GCC7.
> gcc-7 t.c -fopenacc
In function 'main._omp_fn.0':
lto1: internal compiler error: Segmentation fault
0x7b2d3f crash_signal
../../gcc/toplev.c:337
0x4a1056 flow_loops_find(loops*)
../../gcc/cfgloop.c:456
0x6cc63b input_cfg
../../gcc/lto-streamer-in.c:844
...
adjusted patch:
Index: gcc/lto-streamer-out.c
===================================================================
--- gcc/lto-streamer-out.c (revision 259467)
+++ gcc/lto-streamer-out.c (working copy)
@@ -2077,6 +2077,9 @@ output_function (struct cgraph_node *nod
debug info. */
if (gimple_has_body_p (function))
{
+ /* Fixup loops if required to match discovery done in the reader. */
+ loop_optimizer_init (AVOID_CFG_MODIFICATIONS);
+
streamer_write_uhwi (ob, 1);
output_struct_function_base (ob, fn);
@@ -2134,6 +2137,7 @@ output_function (struct cgraph_node *nod
output_cfg (ob, fn);
+ loop_optimizer_finalize ();
pop_cfun ();
}
else
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Subject: [Bug target/54412] minimal 32-byte stack alignment with -mavx on 64-bit Windows
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Liu Hao <lh_mouse at 126 dot com> changed:
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----------------------------------------------------------------------------
CC| |lh_mouse at 126 dot com
--- Comment #21 from Liu Hao <lh_mouse at 126 dot com> ---
This comment could be important:
<https://github.com/Alexpux/MSYS2-packages/issues/1209#issuecomment-379576367>
> mstorsjo commented 10 days ago
> However, this only seems to be an issue when passing such variables by value. Local variables seem to be properly aligned even with GCC:
If the `__m256` in question in the original post was made to pass by reference,
the crash would go away. From the assembly code following that reply we can
also conclude that, it is not the impossibility of realigning the stack during
run time that is the issue (because RSP was aligned in that snippet of code and
I believe that code was correct). It is GCC does not realign the stack at all
that is the issue.
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Subject: [Bug libstdc++/85442] [7/8 Regression] cxx11-ios_failure.lo build fails for microblaze
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Apr 18 13:13:29 2018
New Revision: 259468
URL: https://gcc.gnu.org/viewcvs?rev=259468&root=gcc&view=rev
Log:
PR libstdc++/85442 fix duplicate debuginfo for cxx11-ios_failure.cc
2018-04-18 Jonathan Wakely <jwakely@redhat.com>
Jakub Jelinek <jakub@redhat.com>
PR libstdc++/85442
* src/c++11/Makefile.am: Don't generate debuginfo again for
cxx11-ios_failure-lt.s and cxx11-ios_failure.s files.
* src/c++11/Makefile.in: Regenerate.
Modified:
branches/gcc-7-branch/libstdc++-v3/ChangeLog
branches/gcc-7-branch/libstdc++-v3/src/c++11/Makefile.am
branches/gcc-7-branch/libstdc++-v3/src/c++11/Makefile.in
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Subject: [Bug libstdc++/85442] [7/8 Regression] cxx11-ios_failure.lo build fails for microblaze
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Should be fixed for 7.4 and 8.1
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Subject: [Bug target/85261] __builtin_arm_set_fpscr ICEs with constant input
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--- Comment #6 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
Author: thopre01
Date: Wed Apr 18 13:17:30 2018
New Revision: 259469
URL: https://gcc.gnu.org/viewcvs?rev=259469&root=gcc&view=rev
Log:
[ARM] Fix PR85261: ICE with FPSCR setter builtin
Instruction pattern for setting the FPSCR expects the input value to be
in a register. However, __builtin_arm_set_fpscr expander does not ensure
that this is the case and as a result GCC ICEs when the builtin is
called with a constant literal.
This commit fixes the builtin to force the input value into a register.
It also remove the unneeded volatile in the existing fpscr test and
fixes the function prototype.
2018-04-18 Thomas Preud'homme <thomas.preudhomme@arm.com>
Backport from mainline
2018-04-11 Thomas Preud'homme <thomas.preudhomme@arm.com>
gcc/
PR target/85261
* config/arm/arm-builtins.c (arm_expand_builtin): Force input operand
into register.
gcc/testsuite/
PR target/85261
* gcc.target/arm/fpscr.c: Add call to __builtin_arm_set_fpscr with
literal value. Expect 2 MCR instruction. Fix function prototype.
Remove volatile keyword.
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/config/arm/arm-builtins.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
branches/gcc-6-branch/gcc/testsuite/gcc.target/arm/fpscr.c
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Subject: [Bug target/85261] __builtin_arm_set_fpscr ICEs with constant input
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Thomas Preud'homme <thopre01 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Known to work| |6.4.1
Resolution|--- |FIXED
Known to fail|6.4.1 |6.4.0
--- Comment #7 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
Fixed in all release branches.
>From gcc-bugs-return-601977-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 13:22:33 2018
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Subject: [Bug libstdc++/85439] mt19937_64 producing unexpected result only in certain configuration
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug target/85220] [meta-bug, nvptx] Run trunk with og7 openacc testcases and analyze execution failures
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--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Filed:
- PR85221 "[openacc] ICE in install_var_field, at omp-low.c:657"
- PR85445 "[nvptx, openacc] Calls to worker and vector routine broken"
and updated a few existing PRs.
There are lots of execution failures due to OpenACC patches not being ported
from og7 to trunk, but for the purposes of this investigation I'm only
interested in missing nvptx patches.
Marking resolved-fixed.
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hyrosen at mail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hyrosen at mail dot com
--- Comment #9 from hyrosen at mail dot com ---
The storage for an object can still be accessible after the object is
destroyed. Therefore, writes in the destructor should not be eliminated unless
they are provably inaccessible:
struct X { int i; ~X() { i = 0; } };
void destroy(X &x) { x.~X(); }
int main()
{
alignas(X) char buf[sizeof(X)], save[sizeof(X)];
X *x = new (buf) X;
x->i = 1;
memcpy(save, buf, sizeof(X));
destroy(*x);
assert(memcmp(buf, save, sizeof(X)) != 0);
}
>From gcc-bugs-return-601980-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 14:05:28 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++/61982] Optimizer does not eliminate stores to destroyed objects
Date: Wed, 18 Apr 2018 14:05:00 -0000
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--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to hyrosen from comment #9)
> The storage for an object can still be accessible after the object is
> destroyed. Therefore, writes in the destructor should not be eliminated
> unless they are provably inaccessible:
>
> struct X { int i; ~X() { i = 0; } };
>
> void destroy(X &x) { x.~X(); }
>
> int main()
> {
> alignas(X) char buf[sizeof(X)], save[sizeof(X)];
> X *x = new (buf) X;
> x->i = 1;
> memcpy(save, buf, sizeof(X));
> destroy(*x);
> assert(memcmp(buf, save, sizeof(X)) != 0);
> }
No, that invokes UB.
>From gcc-bugs-return-601981-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 14:21:39 2018
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From: "foddex at foddex dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/85439] mt19937_64 producing unexpected result only in certain configuration
Date: Wed, 18 Apr 2018 14:21:00 -0000
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--- Comment #1 from Marc "Foddex" Oude Kotte <foddex at foddex dot net> ---
When one adds std::hex output formatting for the first four std::cout calls,
for example the first line would then look like:
std::cout << "32 bits gen, uint32_t: " << std::hex <<
generateRandom<std::mt19937, std::uniform_int_distribution, uint32_t>() <<
std::endl;
The output on MSVC and OSX becomes:
32 bits gen, uint32_t: d091bb5c
32 bits gen, uint64_t: d091bb5c22ae9ef6
64 bits gen, uint32_t: f6f6aea6
64 bits gen, uint64_t: c96d191cf6f6aea6
And the output on Linux becomes:
32 bits gen, uint32_t: d091bb5c
32 bits gen, uint64_t: d091bb5c22ae9ef6
64 bits gen, uint32_t: c96d191d
64 bits gen, uint64_t: c96d191cf6f6aea6
A number of observations:
- on line 3, MSVC + OSX seem to return the lower 32 bits of line 4
- on line 3, Linux seems to return the upper 32 bits of line 4, with 1 added
But:
- on line 1, everybody just seems to return the upper 32 bits of line 2
I am at a loss who is right here.
>From gcc-bugs-return-601982-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 14:29:45 2018
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From: "sergej at schumilo dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug demangler/85452] New: Stack-Overflow in nm-new / C++ name demangler (binuitils-2.30-15ubuntu1)
Date: Wed, 18 Apr 2018 14:29:00 -0000
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Bug ID: 85452
Summary: Stack-Overflow in nm-new / C++ name demangler
(binuitils-2.30-15ubuntu1)
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Dear all,
according to the bintutils maintainers the following stack-overflow bug is in
the C++ name demangler (instead of the binutils application nm-new), which is
part of the libiberty library.
This is the original binutils bug report
(https://sourceware.org/bugzilla/show_bug.cgi?id=23058):
-----------------------------------------------------------------------------
Dear all,
after reporting the following bugs to the Ubuntu security team
(https://bugs.launchpad.net/ubuntu/+source/binutils/+bug/1763099), we were
asked to report them directly to the binutils developers:
----------------------------------------------------
Dear all,
The following binutils nm-new Stack-Overflow was found by a modified version of
the kAFL fuzzer (https://github.com/RUB-SysSec/kAFL). I have attached the
crashing input and an ASAN report.
Steps to reproduce:
Build current verison of binutils:
```
pull-lp-source binutils
cd binutils-2.30
CC=clang CXX=clang++ CFLAGS="-fsanitize=address -fsanitize-recover=address
-ggdb" CXXFLAGS="-fsanitize=address -fsanitize-recover=address -ggdb"
LDFLAGS="-fsanitize=address" ./configure
CC=clang CXX=clang++ CFLAGS="-fsanitize=address -fsanitize-recover=address
-ggdb" CXXFLAGS="-fsanitize=address
-fsanitize-recover=address -ggdb" LDFLAGS="-fsanitize=address" make
```
Run inputs under ASAN:
```
ASAN_OPTIONS=halt_on_error=true:allow_addr2line=true ./nm-new a -C -l
--synthetic $file
```
We can verify this issue for nm-new binuitils-2.30-15ubuntu1 (Ubuntu 16.04.4
LTS / sources from "pull-lp-source bintuils").
Credits: Sergej Schumilo, Cornelius Aschermann (both of Ruhr-Universität
Bochum)
Best regards,
Sergej Schumilo
>From gcc-bugs-return-601983-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 14:33:25 2018
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From: "thopre01 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85434] Address of stack protector guard spilled to stack on ARM
Date: Wed, 18 Apr 2018 14:33:00 -0000
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--- Comment #5 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
(In reply to Wilco from comment #4)
> Clearly rematerialization isn't working correctly. Immediates and constant
> addresses like this should never be spilled (using MOV/MOVK could increase
> codesize, but with -Os you should use the literal pool anyway). Check
> legitimate_constant_p returns true, see
> https://gcc.gnu.org/ml/gcc-patches/2017-08/msg00052.html for how it's done
> on AArch64.
By the time LRA happens, this is what LRA sees of the address computation:
(insn 321 6 322 2 (set (reg:SI 274)
(unspec:SI [
(symbol_ref:SI ("__stack_chk_guard") [flags 0xc0] <var_decl
0x7f689803a2d0 __stack_chk_guard>)
] UNSPEC_PIC_SYM)) "test_arm_sp_fpic.c":41 181
{pic_load_addr_32bit}
(expr_list:REG_EQUIV (unspec:SI [
(symbol_ref:SI ("__stack_chk_guard") [flags 0xc0] <var_decl
0x7f689803a2d0 __stack_chk_guard>)
] UNSPEC_PIC_SYM)
(nil)))
(insn 322 321 11 2 (set (reg/f:SI 175)
(mem:SI (plus:SI (reg:SI 176)
(reg:SI 274)) [0 S4 A32])) "test_arm_sp_fpic.c":41 876
{*thumb2_movsi_insn}
(expr_list:REG_DEAD (reg:SI 274)
(expr_list:REG_DEAD (reg:SI 176)
(expr_list:REG_EQUIV (symbol_ref:SI ("__stack_chk_guard") [flags
0xc0] <var_decl 0x7f689803a2d0 __stack_chk_guard>)
(nil)))))
It is this 175 which is spilled because LRA sees it doesn't have a register of
the right class to allocate that pseudo. Because it's a MEM it doesn't see it
as a constant expression and thus does not rematerialize it.
>From gcc-bugs-return-601984-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 14:35:44 2018
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From: "sergej at schumilo dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug demangler/85453] New: OOM-Bug in cxxfilt / C++ name demangler (binuitils-2.30-15ubuntu1)
Date: Wed, 18 Apr 2018 14:35:00 -0000
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Bug ID: 85453
Summary: OOM-Bug in cxxfilt / C++ name demangler
(binuitils-2.30-15ubuntu1)
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: demangler
Assignee: unassigned at gcc dot gnu.org
Reporter: sergej at schumilo dot de
Target Milestone: ---
Dear all,
according to the bintutils maintainers the following OOM-bug is in the C++ name
demangler (instead of the binutils application cxxfilt), which is part of the
libiberty library.
This is the original binutils bug report
(https://sourceware.org/bugzilla/show_bug.cgi?id=23059):
-----------------------------------------------------------------------------
Dear all,
after reporting the following bugs to the Ubuntu security team
(https://bugs.launchpad.net/ubuntu/+source/binutils/+bug/1763101), we were
asked to report them directly to the binutils developers:
----------------------------------------------------
Dear all,
The following binutils cxxfilt OOM bug was found by a modified version of the
kAFL fuzzer (https://github.com/RUB-SysSec/kAFL). I have attached the input and
an ASAN report.
Steps to reproduce:
Build current verison of binutils:
```
pull-lp-source binutils
cd binutils-2.30
CC=clang CXX=clang++ CFLAGS="-fsanitize=address -fsanitize-recover=address
-ggdb" CXXFLAGS="-fsanitize=address -fsanitize-recover=address -ggdb"
LDFLAGS="-fsanitize=address" ./configure
CC=clang CXX=clang++ CFLAGS="-fsanitize=address -fsanitize-recover=address
-ggdb" CXXFLAGS="-fsanitize=address
-fsanitize-recover=address -ggdb" LDFLAGS="-fsanitize=address" make
```
Run inputs under ASAN:
```
ASAN_OPTIONS=halt_on_error=false:allow_addr2line=true ./cxxfilt -t < oom
```
We can verify this issue for cxxfilt binuitils-2.30-15ubuntu1 (Ubuntu 16.04.4
LTS / sources from "pull-lp-source bintuils") on an Intel(R) Core(TM) i7-6700
CPU @ 3.40GHz server machine with 32GB RAM.
Credits: Sergej Schumilo, Cornelius Aschermann (both of Ruhr-Universität
Bochum)
Best regards,
Sergej Schumilo
>From gcc-bugs-return-601985-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 14:38:40 2018
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
Date: Wed, 18 Apr 2018 14:38:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |WAITING
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Can you explain how you expose the miscompilation in the project.
I built https://github.com/akheron/jansson with -O3 and did make check.
But it's fine.
>From gcc-bugs-return-601986-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 14:53:53 2018
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Subject: [Bug target/85424] The __builtin_packlongdouble function might have issues with the output overlapping the inputs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85424
Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |7.4
>From gcc-bugs-return-601988-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 14:56:47 2018
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Subject: [Bug libstdc++/85439] mt19937_64 producing unexpected result only in certain configuration
Date: Wed, 18 Apr 2018 14:56:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I don't think there is a "right" answer, because the precise behaviour of
std::uniform_int_distribution is unspecified. The mersenne twister RBGs must
give portable results across implementations, but the distributions don't have
to.
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From: "hyrosen at mail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/61982] Optimizer does not eliminate stores to destroyed objects
Date: Wed, 18 Apr 2018 14:56:00 -0000
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--- Comment #11 from hyrosen at mail dot com ---
(In reply to Jakub Jelinek from comment #10)
> (In reply to hyrosen from comment #9)
> > The storage for an object can still be accessible after the object is
> > destroyed. Therefore, writes in the destructor should not be eliminated
> > unless they are provably inaccessible:
> >
> > struct X { int i; ~X() { i = 0; } };
> >
> > void destroy(X &x) { x.~X(); }
> >
> > int main()
> > {
> > alignas(X) char buf[sizeof(X)], save[sizeof(X)];
> > X *x = new (buf) X;
> > x->i = 1;
> > memcpy(save, buf, sizeof(X));
> > destroy(*x);
> > assert(memcmp(buf, save, sizeof(X)) != 0);
> > }
>
> No, that invokes UB.
Do you have a reference that demonstrates that?
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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: Wed, 18 Apr 2018 14:57:00 -0000
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John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> changed:
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CC| |glaubitz at physik dot fu-berlin.d
| |e
--- Comment #27 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
> Port is now obsolete, will be removed in GCC9 unless sufficient maintenance is provided.
So, instead fixing bugs upstream projects just now tell users to go away?
>From gcc-bugs-return-601990-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 14:59:56 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: Wed, 18 Apr 2018 14:59:00 -0000
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--- Comment #28 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
Just built two weeks ago, natively:
root@atlantis:~> gcc-8 -v
Using built-in specs.
COLLECT_GCC=gcc-8
COLLECT_LTO_WRAPPER=/usr/lib/gcc/powerpc-linux-gnuspe/8/lto-wrapper
Target: powerpc-linux-gnuspe
Configured with: ../src/configure -v --with-pkgversion='Debian 8-20180402-1'
--with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-8
--program-prefix=powerpc-linux-gnuspe- --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-libitm
--disable-libsanitizer --disable-libquadmath --disable-libquadmath-support
--enable-plugin --with-system-zlib --disable-libphobos --enable-objc-gc=auto
--enable-secureplt --disable-multilib --enable-multiarch --with-cpu=8548
--enable-e500_double --disable-werror --with-long-double-128
--enable-checking=release --build=powerpc-linux-gnuspe
--host=powerpc-linux-gnuspe --target=powerpc-linux-gnuspe
Thread model: posix
gcc version 8.0.1 20180402 (experimental) [trunk revision 259004] (Debian
8-20180402-1)
root@atlantis:~>
Full build log:
https://buildd.debian.org/status/fetch.php?pkg=gcc-8&arch=powerpcspe&ver=8-20180402-1&stamp=1522856967&raw=0
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Subject: [Bug libstdc++/85439] mt19937_64 producing unexpected result only in certain configuration
Date: Wed, 18 Apr 2018 15:00:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The Boost implementations of mt19937 and uniform_int_distribution produce a
third slightly different set of results:
32 bits gen, uint32_t: 3499211612
32 bits gen, uint64_t: 2499109626135559004
64 bits gen, uint32_t: 3379370268
64 bits gen, uint64_t: 14514284786278117030
>From gcc-bugs-return-601993-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 15:11:28 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 target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Wed, 18 Apr 2018 15:11:00 -0000
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--- Comment #29 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The port is not actively maintained and contains estimated 75%-80% of dead
code.
The rs6000 backend had since the split around 290 commits that didn't touch the
powerpcspe backend, if we just assume that only 20% of those are relevant to
powerpcspe too (hard to judge exactly because the dead code from there isn't
removed), then that is still significant number of known issues in the port.
The announcement of the intent to obsolete the port has been posted already
more than a year ago, if you look in the comments in this PR, you'll see
numerous pings, despite which no (significant) action has been taken.
GCC backends need active maintainance, including regular testing, reporting
regressions and fixing those, otherwise they are only significant burden to
other maintainers and not really useful to users.
>From gcc-bugs-return-601992-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 15:11:14 2018
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From: "sergej at schumilo dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug demangler/85454] New: Multiple memory corruptions in objdump / C++ name demangler (binuitils-2.30-15ubuntu1)
Date: Wed, 18 Apr 2018 15:11:00 -0000
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Bug ID: 85454
Summary: Multiple memory corruptions in objdump / C++ name
demangler (binuitils-2.30-15ubuntu1)
Product: gcc
Version: unknown
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Reporter: sergej at schumilo dot de
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Dear all,
according to the bintutils maintainers the following memory corruption bugs are
in the C++ name demangler (instead of the binutils application objdump), which
is part of the libiberty library.
This is the original binutils bug report
(https://sourceware.org/bugzilla/show_bug.cgi?id=23057):
-----------------------------------------------------------------------------
Dear all,
after reporting the following bugs to the Ubuntu security team
(https://bugs.launchpad.net/ubuntu/+source/binutils/+bug/1763102), we were
asked to report them directly to the binutils developers:
----------------------------------------------------
Dear all,
The following binutils objdump memory corruptions were found by a modified
version of the kAFL fuzzer (https://github.com/RUB-SysSec/kAFL). I have
attached the crashing inputs and each ASAN report.
Steps to reproduce:
Build current verison of binutils:
```
pull-lp-source binutils
cd binutils-2.30
CC=clang CXX=clang++ CFLAGS="-fsanitize=address -fsanitize-recover=address
-ggdb" CXXFLAGS="-fsanitize=address -fsanitize-recover=address -ggdb"
LDFLAGS="-fsanitize=address" ./configure
CC=clang CXX=clang++ CFLAGS="-fsanitize=address -fsanitize-recover=address
-ggdb" CXXFLAGS="-fsanitize=address
-fsanitize-recover=address -ggdb" LDFLAGS="-fsanitize=address" make
```
Run inputs under ASAN:
```
ASAN_OPTIONS=halt_on_error=false:allow_addr2line=true ./objdump --dwarf-check
-C -g -f -dwarf -x $file
```
We can verify those issues for objdump binuitils-2.30-15ubuntu1 (Ubuntu 16.04.4
LTS / sources from "pull-lp-source bintuils").
Credits: Sergej Schumilo, Cornelius Aschermann (both of Ruhr-Universität
Bochum)
Best regards,
Sergej Schumilo
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Subject: [Bug other/85398] g++ reports "array subscript is above array bounds" when it cannot be sure
Date: Wed, 18 Apr 2018 15:17:00 -0000
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--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
A simpler test case is this (which is analogous to what the loop is transformed
into):
$ cat x.c && gcc -O2 -S -Wall x.c
unsigned left[1];
unsigned long right[1];
void f (unsigned i)
{
if (i)
left[i] = right[i - 1];
}
x.c: In function ‘f’:
x.c:7:11: warning: array subscript [0, 0] is outside array bounds of ‘unsigned
int[1]’ [-Warray-bounds]
left[i] = right[i - 1];
~~~~^~~
Here it's even more obvious that the warning is wrong.
It seems to me that the whole if statement could either be eliminated or its
body replaced by a trap because the assignment in it is undefined. That would
eliminate the loop (and with it also the warning).
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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: Wed, 18 Apr 2018 15:22:00 -0000
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--- Comment #30 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to Jakub Jelinek from comment #29)
> The rs6000 backend had since the split around 290 commits that didn't touch
> the powerpcspe backend, if we just assume that only 20% of those are
> relevant to powerpcspe too (hard to judge exactly because the dead code from
> there isn't removed), then that is still significant number of known issues
> in the port.
It works fine for Debian. gcc-8 is able to build itself on powerpcspe with no
apparent issues. I can also run the testsuite if necessary. We currently have
turned it off to save build time as we currently have only three powerpcspe
build machines. But we will add two more in the near future and then we can
also enable running testsuites.
> The announcement of the intent to obsolete the port has been posted already
> more than a year ago, if you look in the comments in this PR, you'll see
> numerous pings, despite which no (significant) action has been taken.
Well, not everyone can be on every list, so it's easy to miss such
announcements. There are many projects like OpenJDK, binutils, glibc, the
kernel and such which want upstream attention, so you have to agree it's a bit
difficult to be always everywhere to be able to answer questions. I was just
pointed at your deprecation mail on IRC.
In any case, Debian is probably the largest downstream user that has such a
huge variety of ports. We are building always the latest versions of gcc
natively on more than 20 architectures:
> https://buildd.debian.org/status/package.php?p=gcc-8&suite=sid
Matthias Klose is constantly uploading new versions and we always make sure gcc
builds fine on all targets - natively. We also have a gcc-snapshot package that
is constantly updated to the latest SVN version and built natively as well:
> https://buildd.debian.org/status/package.php?p=gcc-snapshot&suite=sid
We have users who are using Debian on these targets, even on m68k because retro
computing is very popular around that CPU.
So, I think it would be fair if important upstream projects like gcc could send
a message to downstream projects like Debian in such cases, to give at least
users of certain ports a notice if there are any concerns upstream.
> GCC backends need active maintainance, including regular testing, reporting
> regressions and fixing those, otherwise they are only significant burden to
> other maintainers and not really useful to users.
I am aware of that. But the thing is, the backend in question works fine at the
moment. I would agree with your stance if we were seeing any serious issues
with it. But that's currently not the case, so I don't understand this
particular action.
Is there anything specific bug that blocks things at the moment that we are
missing downstream?
>From gcc-bugs-return-601996-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 15:43:16 2018
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Wed, 18 Apr 2018 15:43:00 -0000
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Dennis Clarke <dclarke at blastwave dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work|8.0 |
--- Comment #4 from Dennis Clarke <dclarke at blastwave dot org> ---
Why was the "Known to work" changed to "8.0" when no such release exists?
I am going to delete that.
For the moment it seems that a git pull and build from trunk needs to
be done in order to test the "theory" that libquadmath will actually
work in various places. This will include sparc64 on both Debian linux
and Solaris.
>From gcc-bugs-return-601997-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 15:46:53 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Wed, 18 Apr 2018 15:46:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |8.0
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
8.0 marks the development versions of the upcoming 8.1, 8.2 etc. releases, 8.0
will never be released itself.
libquadmath is not enabled on sparc64, right now it is just enabled on targets
that have a __float128 or similar type, so i?86, x86_64, ia64 and powerpc*.
sparc64 should have IEEE754 quad support in glibc already, just use long
double.
>From gcc-bugs-return-601998-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 15:53:01 2018
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Subject: [Bug target/85434] Address of stack protector guard spilled to stack on ARM
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--- Comment #6 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
(In reply to Thomas Preud'homme from comment #3)
>
> My feeling is that the target patterns should also do the address
> computation, ie stack_protect_set and stack_protect_test would take that MEM
> of symbol_ref instead of expanding it first.
The more I think about it the more I think it's the only way to guarantee the
guard's address does not end up in a register that could be spilled. The
spilling itself is more likely to happen when reading the GOT entry that holds
the guard's address is not represented by an UNSPEC because then the address
computed when setting the canari is reused when doing the comparison. UNSPEC
seems to prevent that (even though it's not UNSPEC_VOLATILE).
>From gcc-bugs-return-601999-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 16:18:49 2018
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
Date: Wed, 18 Apr 2018 16:18:00 -0000
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--- Comment #2 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
The latest master seems to not trigger the problematic specializations.
Instead check out commit d7ddbf366197605642f725cce6165dfb179a114e
and then a normal
CFLAGS="-O3 -w -save-temps" ./configure
make
make check
should show the issues. For me using an x86_64 build of trunk I get
=================================================================
api/test_dump.c
=================================================================
Segmentation fault (core dumped)
=================================================================
api/test_dump_callback.c
=================================================================
test_dump_callback.c:run_tests:44: json_dumps failed
=================================================================
api/test_object.c
=================================================================
Segmentation fault (core dumped)
and the dump.s file produced shows the error.
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From: "segher at gcc dot gnu.org" <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
Date: Wed, 18 Apr 2018 16:56:00 -0000
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--- Comment #31 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to John Paul Adrian Glaubitz from comment #30)
> > The announcement of the intent to obsolete the port has been posted already
> > more than a year ago, if you look in the comments in this PR, you'll see
> > numerous pings, despite which no (significant) action has been taken.
>
> Well, not everyone can be on every list, so it's easy to miss such
> announcements.
It would have been announced in gcc-7/changes.html (linked from the
announcement on gcc-announce@, I do hope you read that?), but instead of
obsoleting SPE support in the rs6000 port we split off the powerpcspe port,
which was promised to be maintained. Now that that does not seem to be
happening, it will be obsoleted anyway.
Someone needs to do the work.
> We have users who are using Debian on these targets, even on m68k because
> retro computing is very popular around that CPU.
m68k needs some serious work, too, in the not far future (if the cc0 removal
finally goes through -- that has been over ten years now).
> So, I think it would be fair if important upstream projects like gcc could
> send a message to downstream projects like Debian in such cases, to give at
> least users of certain ports a notice if there are any concerns upstream.
Read gcc-announce@. It's what it is for. Only a few posts per year :-)
> > GCC backends need active maintainance, including regular testing, reporting
> > regressions and fixing those, otherwise they are only significant burden to
> > other maintainers and not really useful to users.
>
> I am aware of that. But the thing is, the backend in question works fine at
> the moment. I would agree with your stance if we were seeing any serious
> issues with it. But that's currently not the case, so I don't understand
> this particular action.
>
> Is there anything specific bug that blocks things at the moment that we are
> missing downstream?
A port does not need maintenance only for that port, and its users, but also
for GCC itself. All ports are a cost to _all_ GCC developers. If a port is
not maintained it has to be removed.
Segher
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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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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81084
--- Comment #32 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to Segher Boessenkool from comment #31)
> It would have been announced in gcc-7/changes.html (linked from the
> announcement on gcc-announce@, I do hope you read that?), but instead of
> obsoleting SPE support in the rs6000 port we split off the powerpcspe port,
> which was promised to be maintained. Now that that does not seem to be
> happening, it will be obsoleted anyway.
Andrew said he is still working on it. That is not the same as saying the
promise is not going to be kept. gcc isn't a trivial project after all and that
work can take some time.
> Someone needs to do the work.
Sure. I understand that and I am not denying that. But I don't see that this
particular port is broken as it is claimed here. Otherwise it wouldn't work for
Debian at all, would it?
> > We have users who are using Debian on these targets, even on m68k because
> > retro computing is very popular around that CPU.
>
> m68k needs some serious work, too, in the not far future (if the cc0 removal
> finally goes through -- that has been over ten years now).
Yes, I am aware of that. But there are enough people interested in such work so
I think we will be able get around doing that at some point.
> > So, I think it would be fair if important upstream projects like gcc could
> > send a message to downstream projects like Debian in such cases, to give at
> > least users of certain ports a notice if there are any concerns upstream.
>
> Read gcc-announce@. It's what it is for. Only a few posts per year :-)
Ok, I will be subscribing to that one.
> > > GCC backends need active maintainance, including regular testing, reporting
> > > regressions and fixing those, otherwise they are only significant burden to
> > > other maintainers and not really useful to users.
> >
> > I am aware of that. But the thing is, the backend in question works fine at
> > the moment. I would agree with your stance if we were seeing any serious
> > issues with it. But that's currently not the case, so I don't understand
> > this particular action.
> >
> > Is there anything specific bug that blocks things at the moment that we are
> > missing downstream?
>
> A port does not need maintenance only for that port, and its users, but also
> for GCC itself. All ports are a cost to _all_ GCC developers. If a port is
> not maintained it has to be removed.
So, again my question is: What exactly is the with the powerpcspe target at the
moment and why does upstream claim the port is broken when it apparently works
for us in Debian? Am I missing something?
I understand where you are coming from and I know that maintenance needs
manpower. However, gcc isn't just any project, it's probably the core project
besides the kernel. If you remove a target in gcc, you are killing that target
for everyone and that is a problem for its users.
And probably the biggest advantage of gcc over LLVM is the plethora of targets
it supports. If you are going to ax most of it so that only the targets of
commercial relevance would survive - i.e. x86, ARM, s390 and POWER8+ - you will
be loosing one of the biggest selling points of gcc.
>From gcc-bugs-return-602002-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 17:28:25 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 target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Wed, 18 Apr 2018 17:28:00 -0000
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--- Comment #33 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to John Paul Adrian Glaubitz from comment #32)
> Andrew said he is still working on it. That is not the same as saying the
> promise is not going to be kept. gcc isn't a trivial project after all and
> that work can take some time.
Yes, but the port split was done in May last year, and nothing substantial
happened since then. Port maintainance is not about promises, but about doing
the work. If he does the work soon, the port can be de-obsoleted in GCC9,
otherwise it will be removed, which doesn't mean it can't be added at some
point later. Of course, the later it will be done, the harder it will be.
> > m68k needs some serious work, too, in the not far future (if the cc0 removal
> > finally goes through -- that has been over ten years now).
>
> Yes, I am aware of that. But there are enough people interested in such work
> so I think we will be able get around doing that at some point.
Nobody did the work in the last 15+ years for m68k, it doesn't seem likely that
all of sudden it will happen. There have been numerous posts about what to do
to get rid of cc0, e.g. in 2005 and several other years.
See https://gcc.gnu.org/backends.html for details, a healthy port doesn't have
c (cc0), p (not using define_peephole2), has a (uses LRA). We can't maintain
old reload, or cc0 support indefinitely.
> > A port does not need maintenance only for that port, and its users, but also
> > for GCC itself. All ports are a cost to _all_ GCC developers. If a port is
> > not maintained it has to be removed.
>
> So, again my question is: What exactly is the with the powerpcspe target at
> the moment and why does upstream claim the port is broken when it apparently
> works for us in Debian? Am I missing something?
Have you read all the threads mentioned in
https://gcc.gnu.org/ml/gcc/2018-04/msg00102.html
and all the above comments? All the details are in there.
>From gcc-bugs-return-602003-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 17:30:54 2018
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Wed, 18 Apr 2018 17:30:00 -0000
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--- Comment #6 from Dennis Clarke <dclarke at blastwave dot org> ---
Following the instructions at https://gcc.gnu.org/wiki/GitMirror there is
no branch anywhere that claims to be a version 8 type.
Where is this ver 8 code hidden away ?
>From gcc-bugs-return-602004-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 17:37:56 2018
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
Date: Wed, 18 Apr 2018 17:37:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
simple test-case that fails (put it into src/ subfolder):
$ cat main.c
#include <jansson.h>
#include <string.h>
#include <stdlib.h>
int main ()
{
/* Encode an empty object/array, add an item, encode again */
json_t *json;
const char str[] = "[\"A\", {\"B\": \"C\", \"e\": false}, 1, null,
\"foo\"]";
char *dumped_to_string;
json = json_loads(str, 0, NULL);
if(!json) {
__builtin_abort ();
}
dumped_to_string = json_dumps(json, 0);
if (!dumped_to_string) {
__builtin_abort ();
}
return 0;
}
$ gcc main.c -I. .libs/libjansson.a && ./a.out
Aborted (core dumped)
>From gcc-bugs-return-602005-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 17:49:00 2018
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Wed, 18 Apr 2018 17:48:00 -0000
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Arseny Solokha <asolokha at gmx dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |asolokha at gmx dot com
--- Comment #34 from Arseny Solokha <asolokha at gmx dot com> ---
In an unfortunate event of actually removing the port during the next stage 1,
is it possible to keep related PRs open for another release cycle? This way
Andrew working on bringing the port back would have an idea of what
user-visible issues it had besides the needed cleanup and ordinary testsuite
failures.
>From gcc-bugs-return-602006-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 17:52:59 2018
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Subject: [Bug other/50639] -flto=jobserver broken on large LTO build
Date: Wed, 18 Apr 2018 17:52:00 -0000
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--- Comment #2 from Andi Kleen <andi-gcc at firstfloor dot org> ---
FWIW the problem disappeared for me at some point (could have been newer kernel
or different make). I don't see it anymore.
I think it was some problems with the pipes used by the job server losing a
token
>From gcc-bugs-return-602007-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 17:56:59 2018
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Subject: [Bug ipa/85447] [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
Date: Wed, 18 Apr 2018 17:56:00 -0000
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Martin Jambor <jamborm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #43979|0 |1
is obsolete| |
--- Comment #6 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Created attachment 43981
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43981&action=edit
Fix undergoing testing
The previous patch was missing one hunk. This is what I am currently testing.
>From gcc-bugs-return-602008-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 17:59:56 2018
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
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--- Comment #4 from Martin Jambor <jamborm at gcc dot gnu.org> ---
OK, I can see a failure with trunk but not with my fix for PR 85447. Looking
into IPA-CP dumps of both, I guess that although the mechanism of this bug
might be slightly different, the fix will be the same. I'll continue
investigating what exactly happens...
>From gcc-bugs-return-602009-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 18:13:35 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Wed, 18 Apr 2018 18:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85440
--- Comment #7 from Dennis Clarke <dclarke at blastwave dot org> ---
found this : https://gcc.gnu.org/pub/gcc/snapshots/LATEST-8/
I will give that a try.
>From gcc-bugs-return-602010-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 18:23:41 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/85455] New: [8 Regression] ICE in verify_loop_structure, at cfgloop.c:1708 (error: basic block 3 should be marked irreducible)
Date: Wed, 18 Apr 2018 18:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85455
Bug ID: 85455
Summary: [8 Regression] ICE in verify_loop_structure, at
cfgloop.c:1708 (error: basic block 3 should be marked
irreducible)
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
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Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
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gcc-8.0.0-alpha20180415 snapshot (r259389) ICEs when compiling the following
snippet w/ -O1 -fthread-jumps -fno-tree-dominator-opts -fno-tree-reassoc
-fno-tree-sink -fno-tree-slsr:
void
ty (void);
void
um (void);
void
au (int qj)
{
if (qj < 1)
{
vq:
ty ();
}
um ();
goto vq;
}
% gcc-8.0.0-alpha20180415 -O1 -fthread-jumps -fno-tree-dominator-opts
-fno-tree-reassoc -fno-tree-sink -fno-tree-slsr -c ad6zjqua.c
ad6zjqua.c: In function 'au':
ad6zjqua.c:19:1: error: basic block 3 should be marked irreducible
}
^
ad6zjqua.c:19:1: error: basic block 4 should be marked irreducible
during RTL pass: jump
ad6zjqua.c:19:1: internal compiler error: in verify_loop_structure, at
cfgloop.c:1708
0x88fd64 verify_loop_structure()
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/cfgloop.c:1708
0xbc7767 execute_function_todo
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/passes.c:2010
0xbc857e execute_todo
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180415/work/gcc-8-20180415/gcc/passes.c:2048
>From gcc-bugs-return-602011-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 18:42:57 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/85448] the compiler selects the wrong subroutine because of bind(c,name=...)
Date: Wed, 18 Apr 2018 18:42:00 -0000
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kargl at gcc dot gnu.org changed:
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--- Comment #1 from kargl at gcc dot gnu.org ---
(In reply to francois.jacq from comment #0)
> In the following example, the subroutine c_open of the module m2, which
> should call the subroutine odopen of the module m1, calls itself instead...
The behavior you see is correct. There is no 'c_odopen'
in the m2.o file. You gave it the binding name 'odopen'.
You have created a recursive call.
$ gfcx -c m1.f90
$ nm m1.o
0000000000000000 T __m1_MOD_odopen
U _gfortran_st_write
U _gfortran_st_write_done
U _gfortran_transfer_character_write
$ gfcx -c m2.f90
$ nm m2.o
U _gfortran_st_write
U _gfortran_st_write_done
U _gfortran_transfer_character_write
0000000000000000 T odopen
>From gcc-bugs-return-602012-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 18:54:21 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 libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Wed, 18 Apr 2018 18:54:00 -0000
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--- Comment #8 from kargl at gcc dot gnu.org ---
(In reply to Dennis Clarke from comment #6)
> Following the instructions at https://gcc.gnu.org/wiki/GitMirror there is
> no branch anywhere that claims to be a version 8 type.
>
> Where is this ver 8 code hidden away ?
mkdir gcc; cd gcc
git init
# By default pulls all heads (trunk, release branches, git-only branches, a few
other selected SVN branches)
git remote add origin git://gcc.gnu.org/git/gcc.git
# Also include all the other SVN branches (adds about 0.2GB)
git config --add remote.origin.fetch 'refs/remotes/*:refs/remotes/svn/*'
git fetch
git checkout -b trunk svn/trunk <----- This is 8.0.
When 8.1 is released, trunk will become 9.0.
>From gcc-bugs-return-602013-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 19:01:22 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/31298] [F03] use mod, operator(+) => operator(.userOp.) not supported
Date: Wed, 18 Apr 2018 19:01:00 -0000
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janus at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
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--- Comment #19 from janus at gcc dot gnu.org ---
(In reply to Jürgen Reuter from comment #18)
> Contrary to what Tobias Burnus claimed, I think this case is indeed
> forbidden.
I agree with Jürgen's assessment in comment #18 that use-renaming of operators
may not involve any intrinsic operators, which is also supported by ifort 18
and MR&C (as noted by Tobias in comment #13).
Here is a simple test case that is accepted by ifort and gfortran as is (and
rejected by both when uncommenting the commented line):
module m
interface operator(.myplus.)
procedure add
end interface
contains
integer function add(a, b)
integer, intent(in) :: a,b
add = abs(a) + abs(b)
end function
end module
program p
! use m, only: operator(+) => operator(.myplus.) ! forbidden
use m, only: operator(.otherplus.) => operator(.myplus.)
print *, -1 .otherplus. -2
end
So: Let's finally close this PR ...
>From gcc-bugs-return-602014-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 19:01:24 2018
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Subject: [Bug fortran/20585] [meta-bug] Fortran 2003 support
Date: Wed, 18 Apr 2018 19:01:00 -0000
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Bug 20585 depends on bug 31298, which changed state.
Bug 31298 Summary: [F03] use mod, operator(+) => operator(.userOp.) not supported
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31298
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>From gcc-bugs-return-602015-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 19:01:49 2018
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Wed, 18 Apr 2018 19:01:00 -0000
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--- Comment #9 from Dennis Clarke <dclarke at blastwave dot org> ---
Thank you Sir.
I think it best if I stay with the nightly/test tarball found
at https://gcc.gnu.org/pub/gcc/snapshots/LATEST-8/ and then
I won't have to fiddle with automake/reconf etc or be too
concerned with configure.am and all that jazz.
>From gcc-bugs-return-602016-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 19:15:07 2018
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From: "hjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85388] Missing ENDBR after __morestack call
Date: Wed, 18 Apr 2018 19:15:00 -0000
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--- Comment #6 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Wed Apr 18 19:14:28 2018
New Revision: 259475
URL: https://gcc.gnu.org/viewcvs?rev=259475&root=gcc&view=rev
Log:
i386: Insert ENDBR after __morestack call
Since __morestack will jump back to its callee via indirect call, we
need to insert ENDBR after calling __morestack.
gcc/
PR target/85388
* config/i386/i386.c (ix86_expand_split_stack_prologue): Insert
ENDBR after calling __morestack.
gcc/testsuite/
PR target/85388
* gcc.dg/pr85388-1.c: New test.
* gcc.dg/pr85388-2.c: Likewise.
* gcc.dg/pr85388-3.c: Likewise.
* gcc.dg/pr85388-4.c: Likewise.
* gcc.dg/pr85388-5.c: Likewise.
* gcc.dg/pr85388-6.c: Likewise.
Added:
trunk/gcc/testsuite/gcc.dg/pr85388-1.c
trunk/gcc/testsuite/gcc.dg/pr85388-2.c
trunk/gcc/testsuite/gcc.dg/pr85388-3.c
trunk/gcc/testsuite/gcc.dg/pr85388-4.c
trunk/gcc/testsuite/gcc.dg/pr85388-5.c
trunk/gcc/testsuite/gcc.dg/pr85388-6.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-602018-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 19:25:24 2018
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Subject: [Bug target/81652] [meta-bug] -fcf-protection=full -mcet bugs
Date: Wed, 18 Apr 2018 19:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
Bug 81652 depends on bug 85388, which changed state.
Bug 85388 Summary: Missing ENDBR after __morestack call
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85388
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-602017-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 19:25:23 2018
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Subject: [Bug target/85388] Missing ENDBR after __morestack call
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85388
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
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Target Milestone|--- |8.0
--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 8.
>From gcc-bugs-return-602019-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 19:47:26 2018
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From: "meissner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85456] New: PowerPC: Using -mabi=ieeelongdouble calls wrong function for __builtin_powi.
Date: Wed, 18 Apr 2018 19:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85456
Bug ID: 85456
Summary: PowerPC: Using -mabi=ieeelongdouble calls wrong
function for __builtin_powi.
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Reporter: meissner at gcc dot gnu.org
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When we switch the default long double type, we call the wrong function for
__builtin_powil (i.e. we call __powitf2, when we should call __powikf2). We
will also need a powikf function in libgcc.
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Subject: [Bug target/85456] PowerPC: Using -mabi=ieeelongdouble calls wrong function for __builtin_powi.
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Michael Meissner <meissner at gcc dot gnu.org> changed:
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Subject: [Bug fortran/78219] [F08] specifying the kind of a FORALL index in the header
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janus at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
Blocks| |44646
--- Comment #4 from janus at gcc dot gnu.org ---
Note: These things (R752 and C735) also apply to DO CONCURRENT (PR 44646).
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44646
[Bug 44646] [F08] Implement DO CONCURRENT
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Subject: [Bug fortran/44646] [F08] Implement DO CONCURRENT
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janus at gcc dot gnu.org changed:
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--- Comment #9 from janus at gcc dot gnu.org ---
(In reply to Tobias Burnus from comment #6)
> > TODO as follow up:
> > * Implement type-spec support for "forall" and "do concurrent":
> > "(integer(8) :: i = 1:5:2)"
This TODO is still open (see PR 78219).
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From: "info at thinkmeta dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85457] New: enum and auto template parameter mixup
Date: Wed, 18 Apr 2018 20:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85457
Bug ID: 85457
Summary: enum and auto template parameter mixup
Product: gcc
Version: 7.3.0
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enum class X { Y = 0 };
template <auto>
struct D {};
template <class _T, class _D>
struct Y;
template <class _T, _T _Value>
struct Y<_T, D<_Value>> {};
void test() {
Y<X, D<X::Y>> y1;
Y<int, D<0>> y2; // compile error
Y<int, D<1>> y3; // works
}
For integer values 'auto' is deduced to 'X' if a member with the same value
(here 'Y') was used in an instantiation of 'D'.
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Subject: [Bug lto/84805] [8 Regression] ICE in get_odr_type, at ipa-devirt.c:2096 since r258133
Date: Wed, 18 Apr 2018 20:05:00 -0000
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--- Comment #11 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Apr 18 20:05:10 2018
New Revision: 259477
URL: https://gcc.gnu.org/viewcvs?rev=259477&root=gcc&view=rev
Log:
Revert r25841.
2018-04-18 Martin Liska <mliska@suse.cz>
Revert
2018-03-13 Eric Botcazou <ebotcazou@adacore.com>
PR lto/84805
* ipa-devirt.c (odr_subtypes_equivalent_p): Do not get the ODR type of
incomplete types.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ipa-devirt.c
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Subject: [Bug ipa/83983] FAIL: g++.dg/lto/pr83121 (test for LTO warnings, pr83121_0.C line 8)
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--- Comment #12 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Apr 18 20:06:07 2018
New Revision: 259478
URL: https://gcc.gnu.org/viewcvs?rev=259478&root=gcc&view=rev
Log:
Revert r258133.
2018-04-18 Martin Liska <mliska@suse.cz>
Revert
2018-03-02 Eric Botcazou <ebotcazou@adacore.com>
PR ipa/83983
* ipa-devirt.c (odr_subtypes_equivalent_p): Get the ODR type of both
arguments if they are comparable.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ipa-devirt.c
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Subject: [Bug target/85198] long long int vector mistaken as long int vector
Date: Wed, 18 Apr 2018 20:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85198
Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-18
Ever confirmed|0 |1
--- Comment #3 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Seems like something else weird is going on. For experimenting, I changed
rs6000_handle_altivec_attribute to create vector long long types only for these
cases, and we still have a problem. During parsing, we have a
VIEW_CONVERT_EXPR that reinterprets vulli as an array of long int, even though
vulli has type __vector long long.
#9 0x000000001052ba54 in check_function_arguments (loc=20555813,
fndecl=0x3fffb5c17600, fntype=0x3fffb5dc3678, nargs=2,
argarray=0x3fffb5dd1e58, arglocs=0x3fffffffdb30)
at /home/wschmidt/gcc/gcc-mainline-test/gcc/c-family/c-common.c:5627
5627 check_function_format (TYPE_ATTRIBUTES (fntype), nargs, argarray,
arglocs);
(gdb) ptr argarray[1]
<array_ref 0x3fffb5cd0968
type <integer_type 0x3fffb5b10888 long int public DI
size <integer_cst 0x3fffb5ae1008 constant 64>
unit-size <integer_cst 0x3fffb5ae1020 constant 8>
align:64 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x3fffb5b10888 precision:64 min <integer_cst 0x3fffb5ae1290
-9223372036854775808> max <integer_cst 0x3fffb5ae12a8 9223372036854775807>
pointer_to_this <pointer_type 0x3fffb5b14b78>>
arg:0 <view_convert_expr 0x3fffb5afd9c0
type <array_type 0x3fffb5dc1308 type <integer_type 0x3fffb5b10888 long
int>
TI
size <integer_cst 0x3fffb5ae1050 constant 128>
unit-size <integer_cst 0x3fffb5ae1068 constant 16>
align:64 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x3fffb5dc1308 domain <integer_type 0x3fffb5c998e8>>
arg:0 <var_decl 0x3fffb7f71320 vulli type <vector_type 0x3fffb5bc5e80
__vector long long>
addressable used public static common read V2DI defer-output
pr85198-2.c:3:22 size <integer_cst 0x3fffb5ae1050 128> unit-size <integer_cst
0x3fffb5ae1068 16>
align:128 warn_if_not_align:0>>
arg:1 <integer_cst 0x3fffb5ae1398 type <integer_type 0x3fffb5b10738 int>
constant 0>
pr85198-2.c:7:44 start: pr85198-2.c:7:39 finish: pr85198-2.c:7:46>
Confirmed, BTW.
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Subject: [Bug ipa/83983] FAIL: g++.dg/lto/pr83121 (test for LTO warnings, pr83121_0.C line 8)
Date: Wed, 18 Apr 2018 20:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83983
--- Comment #13 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Apr 18 20:08:44 2018
New Revision: 259479
URL: https://gcc.gnu.org/viewcvs?rev=259479&root=gcc&view=rev
Log:
Make Wodr warnings stable.
2018-04-18 Martin Liska <mliska@suse.cz>
PR ipa/83983
PR ipa/85391
* lto.c (cmp_type_location): New function.
(lto_read_decls): First collect all types, then
sort them according by location before register_odr_type
is called.
2018-04-18 Martin Liska <mliska@suse.cz>
PR ipa/83983
PR ipa/85391
* g++.dg/lto/pr83121_1.C (struct Environment): Adjust expected
output.
Modified:
trunk/gcc/lto/ChangeLog
trunk/gcc/lto/lto.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/lto/pr83121_1.C
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
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--- Comment #18 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Apr 18 20:08:44 2018
New Revision: 259479
URL: https://gcc.gnu.org/viewcvs?rev=259479&root=gcc&view=rev
Log:
Make Wodr warnings stable.
2018-04-18 Martin Liska <mliska@suse.cz>
PR ipa/83983
PR ipa/85391
* lto.c (cmp_type_location): New function.
(lto_read_decls): First collect all types, then
sort them according by location before register_odr_type
is called.
2018-04-18 Martin Liska <mliska@suse.cz>
PR ipa/83983
PR ipa/85391
* g++.dg/lto/pr83121_1.C (struct Environment): Adjust expected
output.
Modified:
trunk/gcc/lto/ChangeLog
trunk/gcc/lto/lto.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/lto/pr83121_1.C
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Subject: [Bug ipa/83983] FAIL: g++.dg/lto/pr83121 (test for LTO warnings, pr83121_0.C line 8)
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #14 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed on trunk.
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Subject: [Bug lto/85391] [8 Regression] ICE in add_type_duplicate, at ipa-devirt.c:1887
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #19 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug ipa/85447] [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
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--- Comment #7 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Thinking about this a bit more, there can be cases where only a subset
(potentially empty) of clones of self-recursive edges of the cloned edges are
to be redirected... I will adjust the patch accordingly.
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Subject: [Bug c++/85444] asm specifier on typedef silently ignored
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--- Comment #4 from Will Hawkins <whh8b at virginia dot edu> ---
(In reply to Richard Biener from comment #3)
> Btw, it could maybe used to adjust mangling... (in C++, that is).
That is absolutely a possibility, if I only knew where to look :-) I found this
documentation:
https://gcc.gnu.org/onlinedocs/gcc/Asm-Labels.html#Asm-Labels
but I see nothing in the documentation to indicate that it has any utility for
a typedef.
Thanks for engaging with me on this! I am going to attach the patch to an email
to the dev list. Thanks again!
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--- Comment #5 from Will Hawkins <whh8b at virginia dot edu> ---
(In reply to Jonathan Wakely from comment #2)
> For a start, patches go to the mailing list, not in bugzilla :-)
>
> https://gcc.gnu.org/contribute.html
Thank you, Jonathan! I was confused by this when I first read the contribution
manual. I wrapped up a patch using the appropriate tools and sent it to the
gcc-patches@ mailing list. At least I tried to the right thing! We'll see :-)
>From gcc-bugs-return-602034-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 22:10:27 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
Date: Wed, 18 Apr 2018 22:10:00 -0000
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Pat Haugen <pthaugen at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu.org
--- Comment #15 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
Richard, concerning my prior comment, any thoughts if this is a similar issue
to what you fixed in pr55334?
>From gcc-bugs-return-602035-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 22:34:18 2018
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
Date: Wed, 18 Apr 2018 22:34:00 -0000
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--- Comment #5 from Martin Jambor <jamborm at gcc dot gnu.org> ---
All right, this is a different bug, the description in the summary describes it
fairly precisely. To the extent to which I am still awake, I believe the fix
is the patch below. I will test it properly tomorrow.
diff --git a/gcc/ipa-cp.c b/gcc/ipa-cp.c
index 4e0e20af409..4a3c9a84e73 100644
--- a/gcc/ipa-cp.c
+++ b/gcc/ipa-cp.c
@@ -3491,7 +3491,9 @@ cgraph_edge_brings_value_p (cgraph_edge *cs,
ipcp_value_source<tree> *src,
return false;
/* At the moment we do not propagate over arithmetic jump functions in SCCs,
so it is safe to detect self-feeding recursive calls in this way. */
- if (!src->val || src->val == dest_val)
+ if (!src->val ||
+ (src->val == dest_val
+ && !caller_info->ipcp_orig_node))
return true;
if (caller_info->ipcp_orig_node)
>From gcc-bugs-return-602036-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 22:38:50 2018
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Subject: [Bug c++/85444] asm specifier on typedef silently ignored
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #3)
> Btw, it could maybe used to adjust mangling... (in C++, that is).
I wish GCC supported doing that for classes (and typedefs that define a name
for linkage purposes) but I'm pretty sure it doesn't at present.
>From gcc-bugs-return-602037-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 22:58:11 2018
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Subject: [Bug middle-end/85458] New: FAIL: gcc.dg/pr83480.c (internal compiler error)
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Bug ID: 85458
Summary: FAIL: gcc.dg/pr83480.c (internal compiler error)
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
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Host: hppa2.0w-hp-hpux11.11
Target: hppa2.0w-hp-hpux11.11
Build: hppa2.0w-hp-hpux11.11
spawn /test/gnu/gcc/objdir/gcc/xgcc -B/test/gnu/gcc/objdir/gcc/
/test/gnu/gcc/gc
c/gcc/testsuite/gcc.dg/pr83480.c -fno-diagnostics-show-caret
-fdiagnostics-color
=never -O2 -g -fselective-scheduling2 -ftree-vectorize
-freorder-blocks-algorith
m=simple -fnon-call-exceptions -fno-guess-branch-probability -fno-peephole2
-fno
-tree-sink -fno-tree-scev-cprop -S -o pr83480.s
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/pr83480.c: In function 'foo':
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/pr83480.c:29:6: warning: division by
zero
[-Wdiv-by-zero]
during RTL pass: sched2
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/pr83480.c:32:1: internal compiler error:
in sel_target_adjust_priority, at sel-sched.c:3336
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
compiler exited with status 1
output is:
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/pr83480.c: In function 'foo':
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/pr83480.c:29:6: warning: division by
zero [-Wdiv-by-zero]
during RTL pass: sched2
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/pr83480.c:32:1: internal compiler error:
in sel_target_adjust_priority, at sel-sched.c:3336
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
FAIL: gcc.dg/pr83480.c (internal compiler error)
PASS: gcc.dg/pr83480.c (test for warnings, line 29)
FAIL: gcc.dg/pr83480.c (test for excess errors)
Excess errors:
during RTL pass: sched2
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/pr83480.c:32:1: internal compiler error:
in sel_target_adjust_priority, at sel-sched.c:3336
>From gcc-bugs-return-602038-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 23:01:15 2018
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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())
Date: Wed, 18 Apr 2018 23:01:00 -0000
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John David Anglin <danglin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |danglin at gcc dot gnu.org
--- Comment #6 from John David Anglin <danglin at gcc dot gnu.org> ---
Fails on hppa2.0w-hp-hpux11.11:
spawn /test/gnu/gcc/objdir/gcc/xgcc -B/test/gnu/gcc/objdir/gcc/
/test/gnu/gcc/gc
c/gcc/testsuite/gcc.dg/pr84941.c -fno-diagnostics-show-caret
-fdiagnostics-color
=never -O2 -S -o pr84941.s
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/pr84941.c: In function 'foo':
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/pr84941.c:9:3: error: 'asm' operand has
i
mpossible constraints
compiler exited with status 1
output is:
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/pr84941.c: In function 'foo':
/test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/pr84941.c:9:3: error: 'asm' operand has
i
mpossible constraints
FAIL: gcc.dg/pr84941.c (test for excess errors)
>From gcc-bugs-return-602039-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Apr 18 23:08:38 2018
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Subject: [Bug tree-optimization/85459] New: [8 Regression] Larger code generated from GMP template meta-programming
Date: Wed, 18 Apr 2018 23:08:00 -0000
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Bug ID: 85459
Summary: [8 Regression] Larger code generated from GMP template
meta-programming
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Created attachment 43982
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43982&action=edit
preprocessed testcase
The attached testcase is a preprocessed version of
https://gmplib.org/list-archives/gmp-bugs/2014-January/003331.html, which I was
about to commit to GMP.
Compiling for x86_64 with g++-7 -O3, I get a nice .s file of size 4174. With
g++-8 -O3, I get a much larger size of 7077. Looking more closely at the
difference, I see a ton of moves. Besides, g++-8 finds fewer
__builtin_constant_p opportunities than g++-7 (__gmpq_mul instead of
__gmpq_mul_2exp for instance).
The dump I glanced at makes me suspect I?SRA, but I am likely completely off.
>From gcc-bugs-return-602040-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 00:04:28 2018
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Subject: [Bug c++/85460] New: g++ does not check incompatible type
Date: Thu, 19 Apr 2018 00:04:00 -0000
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Bug ID: 85460
Summary: g++ does not check incompatible type
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This is my test case:
enum _Ios_Iostate
{
};
template<typename>
struct basic_istream
{
struct sentry
{
sentry(basic_istream& )
{
_Ios_Iostate __err ;
__err |=1;
}
};
};
g++ does not produce any errors, when 1 is assigned to __err. However, when
clang compiles this code, it produces the following message:
error: assigning to '_Ios_Iostate' from incompatible type 'int'
__err |=1;
^ ~
1 error generated.
>From gcc-bugs-return-602041-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 00:22:19 2018
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From: "andrew at aj dot id.au" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/80290] [6/7/8 Regression] g++ uses unreasonable amount of memory compiling nested string maps
Date: Thu, 19 Apr 2018 00:22:00 -0000
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--- Comment #25 from Andrew Jeffery <andrew at aj dot id.au> ---
I built and ran gcc master over the project that was causing us pain, and it
still does. Here's the output:
$ /usr/bin/time make libapphandler_la-sensor-gen.lo
CXX libapphandler_la-sensor-gen.lo
TINST: ctor 2 dtor 2 max 1 end 0 long 2 LST: ctor 0 dtor 0 max 0 end 0 long 0
REFS: 1 reused: 1
TINST: ctor 178 dtor 178 max 1 end 0 long 176 LST: ctor 0 dtor 0 max 0 end 0
long 0 REFS: 1 reused: 2
TINST: ctor 589 dtor 589 max 12 end 0 long 411 LST: ctor 0 dtor 0 max 0 end 0
long 0 REFS: 2 reused: 14
TINST: ctor 876 dtor 844 max 33 end 32 long 411 LST: ctor 0 dtor 0 max 0 end 0
long 0 REFS: 2 reused: 47
TINST: ctor 1105 dtor 1055 max 52 end 50 long 411 LST: ctor 0 dtor 0 max 0 end
0 long 0 REFS: 2 reused: 67
TINST: ctor 5179 dtor 5057 max 124 end 122 long 4074 LST: ctor 0 dtor 0 max 0
end 0 long 0 REFS: 9 reused: 141
TINST: ctor 7298 dtor 7143 max 163 end 155 long 4074 LST: ctor 0 dtor 0 max 0
end 0 long 0 REFS: 9 reused: 182
TINST: ctor 10737 dtor 10391 max 347 end 346 long 4074 LST: ctor 0 dtor 0 max 0
end 0 long 0 REFS: 9 reused: 374
TINST: ctor 20890547 dtor 20889843 max 704 end 704 long 20879810 LST: ctor 0
dtor 0 max 0 end 0 long 0 REFS: 9 reused: 732
TINST: ctor 20912080 dtor 20911687 max 791 end 393 long 20879810 LST: ctor 0
dtor 0 max 0 end 0 long 0 REFS: 23 reused: 819
TINST: ctor 20917617 dtor 20917349 max 791 end 268 long 20879810 LST: ctor 0
dtor 0 max 0 end 0 long 0 REFS: 23 reused: 834
96.24user 2.97system 1:39.31elapsed 99%CPU (0avgtext+0avgdata
5058160maxresident)k
37592inputs+23512outputs (192major+1376999minor)pagefaults 0swaps
>From gcc-bugs-return-602042-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 00:37:55 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: Thu, 19 Apr 2018 00:37:00 -0000
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--- Comment #7 from Will Hawkins <whh8b at virginia dot edu> ---
(In reply to Jonathan Wakely from comment #6)
> (In reply to Richard Biener from comment #3)
> > Btw, it could maybe used to adjust mangling... (in C++, that is).
>
> I wish GCC supported doing that for classes (and typedefs that define a name
> for linkage purposes) but I'm pretty sure it doesn't at present.
I'm interested in what that would even look like. Under what circumstances are
typedefs used to define a name for linkage purposes? I understand a class since
they declare/define a thing two which I can refer.
I don't mean to sound dumb. You certainly don't need to explain it if you can
point to something I can read.
Thanks for helping me learn something new!
>From gcc-bugs-return-602043-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 02:12:49 2018
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From: "zhonghao at pku dot org.cn" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85461] New: A simple recursive TMP static const initializer defeats gcc
Date: Thu, 19 Apr 2018 02:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85461
Bug ID: 85461
Summary: A simple recursive TMP static const initializer
defeats gcc
Product: gcc
Version: unknown
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The test case is as follow:
template<unsigned int v>
class bitWidthHolding {
public:
/** width is the number of bits occupied by the template parameter v
*/
static const
unsigned int width = (v == 0 ? 0 : bitWidthHolding<(v >> 1)>::width + 1);
};
clang++ compiles the code, but gcc produces errors:
../1Testprogramtoillustratetheproblembuiltwithclang-ctestit.cpp: In
instantiation of ‘const unsigned int bitWidthHolding<0>::width’:
../1Testprogramtoillustratetheproblembuiltwithclang-ctestit.cpp:7:73:
recursively required from ‘const unsigned int bitWidthHolding<127>::width’
../1Testprogramtoillustratetheproblembuiltwithclang-ctestit.cpp:7:73:
required from ‘const unsigned int bitWidthHolding<255>::width’
../1Testprogramtoillustratetheproblembuiltwithclang-ctestit.cpp:10:46:
required from here
../1Testprogramtoillustratetheproblembuiltwithclang-ctestit.cpp:7:73: fatal
error: template instantiation depth exceeds maximum of 900 (use
-ftemplate-depth= to increase the maximum)
unsigned int width = (v == 0 ? 0 : bitWidthHolding<(v >> 1)>::width +
1);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
A bug report from clang (https://bugs.llvm.org/show_bug.cgi?id=9999) explains
some details.
>From gcc-bugs-return-602044-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 03:09:16 2018
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From: "jameskuyper at verizon dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/14319] incorrect optimization of union of structs with common initial sequences
Date: Thu, 19 Apr 2018 03:09:00 -0000
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James Kuyper Jr. <jameskuyper at verizon dot net> changed:
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----------------------------------------------------------------------------
CC| |jameskuyper at verizon dot net
--- Comment #11 from James Kuyper Jr. <jameskuyper at verizon dot net> ---
(In reply to Tim Rentsch from comment #10)
...
> Four: Despite the last observation, the "one special guarantee" clause
> (and hence also DR 257) is clearly not germane to this problem. The
> reason for this is that the "one special guarantee" clause is concerned
> with read access ("inspect" is the word used in the Standard), but the
> example code has no read accesses, only write accesses. That paragraph
> of the Standard is not relevant here.
The example code includes the statement
return xp->x;
Which does in fact inspect (read) the value currently stored in a variable that
is part of the common initial sequence. The fact that if fails to read the
value most recently written to that location is the defect that's being
reported.
>From gcc-bugs-return-602045-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 03:36:07 2018
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From: "jameskuyper at verizon dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/14319] incorrect optimization of union of structs with common initial sequences
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--- Comment #12 from James Kuyper Jr. <jameskuyper at verizon dot net> ---
(In reply to Wolfgang Bangerth from comment #2)
> I can't believe the wording means what you imply. Assume that caller
> and callee are in different translation units, then there is no
> way for the compiler to see that the two arguments to the called function
> may in fact be members of the same union.
Complying with this requirement does not require positively determining whether
they are members of the same union. It requires only that code be generated
that would correctly handle the possibility that they are members of the same
union. This basically means that anti-aliasing optimizations that would
ordinarily be enabled by the fact that two struct types are different would
have to be disabled anywhere within the scope of such a union declaration
unless
a) the implementation can be certain that they aren't different members of the
same union object OR
b) the implementation applies those optimizations only if the relevant pointers
do not point at the same location.
> So the only way to assume that they could alias each other is to
> search the universe for a union type in which both of them are members.
> That certainly can't be the intent of the standard or DR. It only makes
> sense, if as RTH says the access is through such a union.
Why would it be necessary to "search the universe"? The rule very explicitly
only applies "anywhere that a declaration of the complete type of the union is
visible." Whether such a declaration is currently visible is something the
implementation must already keep track of, in order to determine whether the
definition of an object of the union's type is permitted.
>From gcc-bugs-return-602046-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 03:54:38 2018
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From: "jameskuyper at verizon dot net" <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: Thu, 19 Apr 2018 03:54:00 -0000
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James Kuyper Jr. <jameskuyper at verizon dot net> changed:
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--- Comment #28 from James Kuyper Jr. <jameskuyper at verizon dot net> ---
(In reply to Martin Sebor from comment #17)
> The C Union Visibility rule was intended to cover that case. The trouble is
> that the rule tends to be interpreted differently by different people, users
> and implementers alike: Is it the union object that must be visible at the
> point of the access, or just the union type?
The relevant wording is "anywhere that a declaration of the completed type of
the union is visible.", so it's unambiguously the type, not the object, which
must be visible. A declaration of the completed type can be visible without any
objects of that type being visible, and that's sufficient for this rule to
apply.
> ... Must the access be performed
> using the union object, or just the union type, or neither?
It says only that "it is permitted to inspect the common initial part"; it
imposes no restrictions on how the inspection may be performed. Clearly,
inspection through an lvalue of the union's type must be permitted, but it is
also permitted to use the more indirect methods which are the subject of this
bug report, simply because the standard says nothing to restrict the permission
it grants to the more direct cases.
>From gcc-bugs-return-602047-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 04:31:28 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/80290] [6/7/8 Regression] g++ uses unreasonable amount of memory compiling nested string maps
Date: Thu, 19 Apr 2018 04:31:00 -0000
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Alexandre Oliva <aoliva at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |deferred
Status|ASSIGNED |NEW
--- Comment #26 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
I don't know that the so-called underlying problem is fixable. Several
template constructors are now involved that weren't in earlier versions of the
standard, and so we have to instantiate them. Even if we recover some of the
temporary memory with the patch that went in, Jason's comment 15 still (and
again) applies.
Which means this should now be marked as deferred.
>From gcc-bugs-return-602048-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 05:22:21 2018
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Subject: [Bug middle-end/58479] [6/7/8 Regression] slow var-tracking on x86_64-linux at -O1 (and above) with -g, but checking disabled
Date: Thu, 19 Apr 2018 05:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58479
--- Comment #15 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
t and the lexical block enclosing it are regarded as unused by
remove_unused_scope_block_p, so process_scope_var doesn't get a chance to
output location information for t. It's there at all because of early debug
info recording. remove_unused_locals has a comment just before the test for
is_gimple_debug that suggests a good spot to keep the block alive, but it has a
significant impact on compile memory use and debug info size, even though it's
not clear that the unused variable would remain in the scope block decl list so
as to get a loclist. I suppose it is not sensible to keep debug bind stmts for
discarded variables past this point, but in several cases, including this, it's
hard to figure out because the bind stmts refer to SRAed fragments of the
actual variable.
>From gcc-bugs-return-602049-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 05:40:30 2018
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Subject: [Bug rtl-optimization/14319] incorrect optimization of union of structs with common initial sequences
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Tim Rentsch <txr at alumni dot caltech.edu> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |txr at alumni dot caltech.edu
--- Comment #13 from Tim Rentsch <txr at alumni dot caltech.edu> ---
Right you are. I don't know how I could have missed that.
>From gcc-bugs-return-602050-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 05:45:55 2018
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Subject: [Bug rtl-optimization/14319] incorrect optimization of union of structs with common initial sequences
Date: Thu, 19 Apr 2018 05:45:00 -0000
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--- Comment #14 from Tim Rentsch <txr at alumni dot caltech.edu> ---
(In reply to James Kuyper from comment #11)
That last message was in reply to James Kuyper in #11. I
was expecting a reference would be added automatically.
>From gcc-bugs-return-602051-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 06:13:43 2018
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From: "manuel.lauss at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85462] New: internal compiler error: in inc_refcount_use, at cp/pt.c:8955
Date: Thu, 19 Apr 2018 06:13:00 -0000
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Bug ID: 85462
Summary: internal compiler error: in inc_refcount_use, at
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Product: gcc
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Created attachment 43983
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43983&action=edit
compressed unreduced testcase
gcc-8 r259483:
$ /usr/bin/x86_64-pc-linux-gnu-g++ -c fault.c
fault.c: In instantiation of ‘bool
clang::RecursiveASTVisitor<Derived>::TraverseAttr(clang::Attr*) [with Derived =
{anonymous}::ParentMapASTVisitor]’:
fault.c:201526:9: required from ‘bool
clang::RecursiveASTVisitor<Derived>::TraverseDecl(clang::Decl*) [with Derived =
{anonymous}::ParentMapASTVisitor]’
fault.c:217418:53: required from here
fault.c:200751:70: internal compiler error: in inc_refcount_use, at
cp/pt.c:8955
return getDerived().TraverseNoSanitizeAttr(cast<NoSanitizeAttr>(A));
~~~~~~~~~~~~~~~~~~~~^~~
attached testcase is from current clang git head, unreduced.
7.3.1 is unaffected for instance.
>From gcc-bugs-return-602052-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 06:39:46 2018
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Subject: [Bug c++/80290] [6/7/8 Regression] g++ uses unreasonable amount of memory compiling nested string maps
Date: Thu, 19 Apr 2018 06:39:00 -0000
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--- Comment #27 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Author: aoliva
Date: Thu Apr 19 06:39:06 2018
New Revision: 259486
URL: https://gcc.gnu.org/viewcvs?rev=259486&root=gcc&view=rev
Log:
PR c++/80290
* cp-tree.h (tinst_level::free): Fix whitespace.
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/cp-tree.h
>From gcc-bugs-return-602053-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 07:18:57 2018
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Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
Date: Thu, 19 Apr 2018 07:18:00 -0000
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--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's hard to tell - will try to look at more dumps produced by a cross which
hopefully matches your setup.
>From gcc-bugs-return-602054-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 07:27:14 2018
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Thu, 19 Apr 2018 07:27:00 -0000
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--- Comment #29 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 19 Apr 2018, jameskuyper at verizon dot net wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65892
>
> James Kuyper Jr. <jameskuyper at verizon dot net> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> CC| |jameskuyper at verizon dot net
>
> --- Comment #28 from James Kuyper Jr. <jameskuyper at verizon dot net> ---
> (In reply to Martin Sebor from comment #17)
> > The C Union Visibility rule was intended to cover that case. The trouble is
> > that the rule tends to be interpreted differently by different people, users
> > and implementers alike: Is it the union object that must be visible at the
> > point of the access, or just the union type?
>
> The relevant wording is "anywhere that a declaration of the completed type of
> the union is visible.", so it's unambiguously the type, not the object, which
> must be visible. A declaration of the completed type can be visible without any
> objects of that type being visible, and that's sufficient for this rule to
> apply.
>
> > ... Must the access be performed
> > using the union object, or just the union type, or neither?
>
> It says only that "it is permitted to inspect the common initial part"; it
> imposes no restrictions on how the inspection may be performed. Clearly,
> inspection through an lvalue of the union's type must be permitted, but it is
> also permitted to use the more indirect methods which are the subject of this
> bug report, simply because the standard says nothing to restrict the permission
> it grants to the more direct cases.
Note I repeatedly said this part of the standard is just stupid. It makes
most if not all type-based alias analysis useless.
Which means I'll refuse any patches implementing it in a way that affects
default behavior. A clean patch (I really can't think of any clean
approach besides forcing -fno-strict-aliasing!) with some extra flag
(well, just use -fno-strict-aliasing ...) would be fine with me.
>From gcc-bugs-return-602055-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 07:29:27 2018
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From: "foddex at foddex dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/85439] mt19937_64 producing unexpected result only in certain configuration
Date: Thu, 19 Apr 2018 07:29:00 -0000
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--- Comment #4 from Marc "Foddex" Oude Kotte <foddex at foddex dot net> ---
The reason I was expecting the same result everywhere is because of this
statement on cppreference.com:
"Notes
The 10000th consecutive invocation of a default-contructed std::mt19937 is
required to produce the value 4123659995.
The 10000th consecutive invocation of a default-contructed std::mt19937_64 is
required to produce the value 9981545732273789042"
Source: http://en.cppreference.com/w/cpp/numeric/random/mersenne_twister_engine
Obviously I'm not testing the 10000th consecutive invocation but the 1st, but I
still expected things to be similar (and they are, in 7/8 test cases).
>From gcc-bugs-return-602056-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 07:33:49 2018
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Subject: [Bug fortran/85448] the compiler selects the wrong subroutine because of bind(c,name=...)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85448
--- Comment #2 from francois.jacq at irsn dot fr ---
(In reply to kargl from comment #1)
> (In reply to francois.jacq from comment #0)
> > In the following example, the subroutine c_open of the module m2, which
> > should call the subroutine odopen of the module m1, calls itself instead...
>
> The behavior you see is correct. There is no 'c_odopen'
> in the m2.o file. You gave it the binding name 'odopen'.
> You have created a recursive call.
No the behavior is not correct : at least, the compiler should issue an error
message precising that there is a name conflict because odopen is also
accessible via the instruction use.
Another variant which clearly shows that the compiler behavior is wrong :
module m2
use iso_c_binding
use m1, only : odopen_m1 => odopen
implicit none
contains
subroutine c_odopen(unit) bind(c,name="odopen")
integer(c_int),intent(out) :: unit
write(*,*) 'c_odopen'
call odopen_m1(unit)
end subroutine
end module
With this variant, I get again the same behavior : c_odopen is called
recursively
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Subject: [Bug tree-optimization/85446] [7/8 Regression] wrong-code on riscv64
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Apr 19 07:46:54 2018
New Revision: 259488
URL: https://gcc.gnu.org/viewcvs?rev=259488&root=gcc&view=rev
Log:
PR tree-optimization/85446
* match.pd ((intptr_t) x eq/ne CST to x eq/ne (typeof x) cst): Require
the integral and pointer types to have the same precision.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/match.pd
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Subject: [Bug tree-optimization/85446] [7 Regression] wrong-code on riscv64
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[7/8 Regression] wrong-code |[7 Regression] wrong-code
|on riscv64 |on riscv64
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed on the trunk so far.
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Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
Date: Thu, 19 Apr 2018 08:11:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 43984
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43984&action=edit
patch I am testing
It is a similar issue, if not the same. With the attached I see the pcom
performed - can you throw it on some ppc testing please?
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
So it's very hard to isolate a simple test-case without not doing an UBSAN.
Thus easiest way to reproduce that is:
$ cd src
$ gcc *.c -I. -O3 && ./a.out
Fatal error: glibc detected an invalid stdio handle
Aborted (core dumped)
with the main.c file I sent.
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From: "tschwinge at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgomp/85463] New: [nvptx] "exit" in offloaded region doesn't terminate process
Date: Thu, 19 Apr 2018 08:31:00 -0000
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Bug ID: 85463
Summary: [nvptx] "exit" in offloaded region doesn't terminate
process
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: openacc, openmp
Severity: normal
Priority: P3
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CC: jakub at gcc dot gnu.org
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Target: nvptx
Consider:
#include <stdlib.h>
int main(int argc, char *argv[])
{
#pragma acc parallel
{
if (argc != 1)
exit(35);
}
return 0;
}
No matter the argc value, this program always terminates normally (exit code
zero).
Is the right solution to have GOACC_parallel etc. detect that exit etc. have
been called inside offloaded regions, and then have them terminate the process
in the appropriate way?
Can we make use of PTX trap in some way for that, to avoid adding overhead of
retval checking for (the majority of) kernel launches that terminate normally?
That is, when C exit is called, set some retval (like currently only done in
stand-alone nvptx target testing), and then call PTX trap instead of PTX exit,
which will then cause cuStreamSynchronize will indicate launch error, then we
can check the retval and do the appropritate thing?
Or, similarly, a scheme where the low-overhead PTX exit is only ever used for
normal (exit code zero) C exit(0), and everything else uses the PTX trap
variant?
This relates to PR85166 "[nvptx, libgfortran] Libgomp fortran tests using stop
in offloaded fns fail to compile", where (still now) a Fortran STOP usage will
not actually terminate the process with the appropriate error code. (The
"abort" testcases in the libgomp testsuite might appear to do the right thing
nevertheless; see the (unresolved) discussion in
<http://mid.mail-archive.com/87inlx3o1a.fsf@hertz.schwinge.homeip.net>.)
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Subject: [Bug c++/85464] New: Wignored-qualifiers is emitted by cc1plus without diagnostics when triggered by a cast operator.
Date: Thu, 19 Apr 2018 08:33:00 -0000
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Bug ID: 85464
Summary: Wignored-qualifiers is emitted by cc1plus without
diagnostics when triggered by a cast operator.
Product: gcc
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Consider the following example:
struct Test {
operator int const() const;
};
When compiling using
g++ -Wextra -c cast.C
I get
cc1plus: warning: type qualifiers ignored on function return type
[-Wignored-qualifiers]
Note that the warning is emitted by cc1plus instead of g++, and does not
contain any further info about e.g. the line that triggers this warning.
Output of g++ -v:
Target: x86_64-redhat-linux
Configured with: ./../gcc-7.3.0/configure --prefix=/lfs/vlsi/tools/gcc/7.3.0
--disable-multilib --enable-languages=c,c++,lto --enable-bootstrap
--enable-shared --enable-threads=posix --enable-checking=release
--with-system-zlib --enable-gnu-unique-object
--with-default-libstdcxx-abi=gcc4-compatible --enable-libmpx
--enable-gnu-indirect-function --with-tune=generic --build=x86_64-redhat-linux
--with-advance-toolchain=/opt/rh/devtoolset-7/root/
Thread model: posix
gcc version 7.3.0 (GCC)
The same problem seems to be present with version 7.1.0, but not with 6.1.0
(although gcc-6.1.0 places the marker on the wrong const, i.e. the last const
of the line, which seems to have been reported and fixed via bug 69733).
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Subject: [Bug c++/85461] A simple recursive TMP static const initializer defeats gcc
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The testcase is incomplete, something like:
int a = bitWidthHolding<255>::width;
is missing, otherwise it doesn't fail. The reason for giving up is that it
tries to instantiate bitWidthHolding<0> many times, doesn't seem to be a
regression, all gcc versions that have -std=c++0x support fail similarly.
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Subject: [Bug c++/85462] [8 Regression] internal compiler error: in inc_refcount_use, at cp/pt.c:8955
Date: Thu, 19 Apr 2018 08:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85462
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-19
CC| |aoliva at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
Target Milestone|--- |8.0
Summary|internal compiler error: in |[8 Regression] internal
|inc_refcount_use, at |compiler error: in
|cp/pt.c:8955 |inc_refcount_use, at
| |cp/pt.c:8955
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Reducing and bisecting now. I suspect r259457.
>From gcc-bugs-return-602065-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 08:52:05 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++/85461] A simple recursive TMP static const initializer defeats gcc
Date: Thu, 19 Apr 2018 08:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85461
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-19
Ever confirmed|0 |1
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think https://wg21.link/cwg712 makes this valid.
>From gcc-bugs-return-602066-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 08:54:16 2018
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From: "tschwinge at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/85166] [nvptx, libgfortran] Libgomp fortran tests using stop in offloaded fns fail to compile
Date: Thu, 19 Apr 2018 08:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85166
--- Comment #7 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
Author: tschwinge
Date: Thu Apr 19 08:53:38 2018
New Revision: 259491
URL: https://gcc.gnu.org/viewcvs?rev=259491&root=gcc&view=rev
Log:
PR85463 '[nvptx] "exit" in offloaded region doesn't terminate process'
libgomp/
PR libfortran/85166
* testsuite/libgomp.oacc-fortran/abort-1.f90: Switch back to "call
abort".
* testsuite/libgomp.oacc-fortran/abort-2.f90: Likewise.
libgfortran/
PR libfortran/85166
PR libgomp/85463
* runtime/minimal.c (stop_numeric): Reimplement.
(stop_string, error_stop_string, error_stop_numeric): New
functions.
libgomp/
PR libgomp/85463
* testsuite/libgomp.oacc-fortran/error_stop-1.f: New file.
* testsuite/libgomp.oacc-fortran/error_stop-2.f: Likewise.
* testsuite/libgomp.oacc-fortran/error_stop-3.f: Likewise.
* testsuite/libgomp.oacc-fortran/stop-1.f: Likewise.
* testsuite/libgomp.oacc-fortran/stop-2.f: Likewise.
* testsuite/libgomp.oacc-fortran/stop-3.f: Likewise.
Added:
trunk/libgomp/testsuite/libgomp.oacc-fortran/error_stop-1.f
trunk/libgomp/testsuite/libgomp.oacc-fortran/error_stop-2.f
trunk/libgomp/testsuite/libgomp.oacc-fortran/error_stop-3.f
trunk/libgomp/testsuite/libgomp.oacc-fortran/stop-1.f
trunk/libgomp/testsuite/libgomp.oacc-fortran/stop-2.f
trunk/libgomp/testsuite/libgomp.oacc-fortran/stop-3.f
Modified:
trunk/libgfortran/ChangeLog
trunk/libgfortran/runtime/minimal.c
trunk/libgomp/ChangeLog
trunk/libgomp/testsuite/libgomp.oacc-fortran/abort-1.f90
trunk/libgomp/testsuite/libgomp.oacc-fortran/abort-2.f90
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From: "tschwinge at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgomp/85463] [nvptx] "exit" in offloaded region doesn't terminate process
Date: Thu, 19 Apr 2018 08:54:00 -0000
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--- Comment #1 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
Author: tschwinge
Date: Thu Apr 19 08:53:38 2018
New Revision: 259491
URL: https://gcc.gnu.org/viewcvs?rev=259491&root=gcc&view=rev
Log:
PR85463 '[nvptx] "exit" in offloaded region doesn't terminate process'
libgomp/
PR libfortran/85166
* testsuite/libgomp.oacc-fortran/abort-1.f90: Switch back to "call
abort".
* testsuite/libgomp.oacc-fortran/abort-2.f90: Likewise.
libgfortran/
PR libfortran/85166
PR libgomp/85463
* runtime/minimal.c (stop_numeric): Reimplement.
(stop_string, error_stop_string, error_stop_numeric): New
functions.
libgomp/
PR libgomp/85463
* testsuite/libgomp.oacc-fortran/error_stop-1.f: New file.
* testsuite/libgomp.oacc-fortran/error_stop-2.f: Likewise.
* testsuite/libgomp.oacc-fortran/error_stop-3.f: Likewise.
* testsuite/libgomp.oacc-fortran/stop-1.f: Likewise.
* testsuite/libgomp.oacc-fortran/stop-2.f: Likewise.
* testsuite/libgomp.oacc-fortran/stop-3.f: Likewise.
Added:
trunk/libgomp/testsuite/libgomp.oacc-fortran/error_stop-1.f
trunk/libgomp/testsuite/libgomp.oacc-fortran/error_stop-2.f
trunk/libgomp/testsuite/libgomp.oacc-fortran/error_stop-3.f
trunk/libgomp/testsuite/libgomp.oacc-fortran/stop-1.f
trunk/libgomp/testsuite/libgomp.oacc-fortran/stop-2.f
trunk/libgomp/testsuite/libgomp.oacc-fortran/stop-3.f
Modified:
trunk/libgfortran/ChangeLog
trunk/libgfortran/runtime/minimal.c
trunk/libgomp/ChangeLog
trunk/libgomp/testsuite/libgomp.oacc-fortran/abort-1.f90
trunk/libgomp/testsuite/libgomp.oacc-fortran/abort-2.f90
>From gcc-bugs-return-602068-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 08:56:48 2018
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Subject: [Bug c++/85460] g++ does not check incompatible type
Date: Thu, 19 Apr 2018 08:56:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-19
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The standard doesn't require a diagnostic here, because you haven't
instantiated the template.
Confirming as an enhancement, because rejecting the code before instantiation
is permitted, just not required.
>From gcc-bugs-return-602069-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 09:01:46 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug other/50639] -flto=jobserver broken on large LTO build
Date: Thu, 19 Apr 2018 09:01:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
So fixed.
>From gcc-bugs-return-602070-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 09:01:47 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/50679] [meta-bug] Linux kernel LTO tracking bug
Date: Thu, 19 Apr 2018 09:01:00 -0000
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Bug 50679 depends on bug 50639, which changed state.
Bug 50639 Summary: -flto=jobserver broken on large LTO build
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50639
What |Removed |Added
----------------------------------------------------------------------------
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From: "francois.jacq at irsn dot fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85448] the compiler selects the wrong subroutine because of bind(c,name=...)
Date: Thu, 19 Apr 2018 09:07:00 -0000
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--- Comment #3 from francois.jacq at irsn dot fr ---
Notice that this is a regression : The version 4.8.5 returns the result I
expected...
>From gcc-bugs-return-602072-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 09:18:13 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85455] [8 Regression] ICE in verify_loop_structure, at cfgloop.c:1708 (error: basic block 3 should be marked irreducible)
Date: Thu, 19 Apr 2018 09:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85455
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-04-19
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Target Milestone|--- |8.0
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
So we end up in
bool
cleanup_cfg (int mode)
{
...
with mode == 41 and
/* ??? We probably do this way too often. */
if (current_loops
&& (changed
|| (mode & CLEANUP_CFG_CHANGED)))
{
timevar_push (TV_REPAIR_LOOPS);
/* The above doesn't preserve dominance info if available. */
gcc_assert (!dom_info_available_p (CDI_DOMINATORS));
calculate_dominance_info (CDI_DOMINATORS);
fix_loop_structure (NULL);
free_dominance_info (CDI_DOMINATORS);
timevar_pop (TV_REPAIR_LOOPS);
}
here changed is false and mode doesn't include CLEANUP_CFG_CHANGED.
while (try_optimize_cfg (mode))
{
returns false here so changed isn't set but the call wrecks loop info.
That is because of
if (mode & (CLEANUP_CROSSJUMP | CLEANUP_THREADING))
clear_bb_flags ();
and
/* Bit mask for all basic block flags that must be preserved. These are
the bit masks that are *not* cleared by clear_bb_flags. */
#define BB_FLAGS_TO_PRESERVE \
(BB_DISABLE_SCHEDULE | BB_RTL | BB_NON_LOCAL_GOTO_TARGET \
| BB_HOT_PARTITION | BB_COLD_PARTITION)
which doesn't include loop related flags. This is a latent issue, certainly
not a regression in general(?), a fix could be
Index: gcc/cfg.c
===================================================================
--- gcc/cfg.c (revision 259486)
+++ gcc/cfg.c (working copy)
@@ -386,9 +386,13 @@ void
clear_bb_flags (void)
{
basic_block bb;
+ int flags_to_preserve = BB_FLAGS_TO_PRESERVE;
+ if (current_loops
+ && loops_state_satisfies_p (cfun,
LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS))
+ flags_to_preserve |= BB_IRREDUCIBLE_LOOP;
FOR_ALL_BB_FN (bb, cfun)
- bb->flags &= BB_FLAGS_TO_PRESERVE;
+ bb->flags &= flags_to_preserve;
}
/* Check the consistency of profile information. We can't do that
>From gcc-bugs-return-602073-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 09:22:30 2018
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Subject: [Bug tree-optimization/85459] [8 Regression] Larger code generated from GMP template meta-programming
Date: Thu, 19 Apr 2018 09:22:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think this is a result of many changes.
E.g. r249885 bumps .s size from 3709 to 4599 bytes, r254724 from 4599 to 5768,
r255510 from 5772 to 7713. You are compiling with -O3, not -Os, so the size is
not what counts though, but the code speed, right?
>From gcc-bugs-return-602074-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 09:23:57 2018
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Subject: [Bug tree-optimization/85459] [8 Regression] Larger code generated from GMP template meta-programming
Date: Thu, 19 Apr 2018 09:23:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target Milestone|--- |8.0
>From gcc-bugs-return-602075-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 09:27:17 2018
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Subject: [Bug testsuite/61606] About GCC install, testing step (mostly check...)
Date: Thu, 19 Apr 2018 09:27:00 -0000
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Jürgen Reuter <juergen.reuter at desy dot de> changed:
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----------------------------------------------------------------------------
CC| |juergen.reuter at desy dot de
--- Comment #3 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Is it really necessary to keep this one here open? Just stumbled on this via
the discussion on c.l.f. This was with 4.9 which is no longer supported.
Probably on an OS that is no longer used by the OP.
>From gcc-bugs-return-602076-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 09:36:58 2018
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Subject: [Bug c++/85464] [7 Regression] Wignored-qualifiers is emitted by cc1plus without diagnostics when triggered by a cast operator.
Date: Thu, 19 Apr 2018 09:36:00 -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| |6.4.0, 8.0.1
Keywords| |diagnostic
Last reconfirmed| |2018-04-19
Ever confirmed|0 |1
Summary|Wignored-qualifiers is |[7 Regression]
|emitted by cc1plus without |Wignored-qualifiers is
|diagnostics when triggered |emitted by cc1plus without
|by a cast operator. |diagnostics when triggered
| |by a cast operator.
Target Milestone|--- |7.4
Known to fail| |7.3.1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. Works again on trunk.
>From gcc-bugs-return-602077-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 09:46:59 2018
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
Date: Thu, 19 Apr 2018 09:46:00 -0000
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--- Comment #7 from Martin Jambor <jamborm at gcc dot gnu.org> ---
I believe I understand the issue and will prepare a testcase from scratch.
Possibly after I test/submit the patch if it takes too long. Thanks for your
effort!
>From gcc-bugs-return-602078-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 09:46:59 2018
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Subject: [Bug c++/85464] [7 Regression] Wignored-qualifiers is emitted by cc1plus without diagnostics when triggered by a cast operator.
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Started with r240863 (the fix for PR 69733) and was fixed by r249935 (for PR
65775).
>From gcc-bugs-return-602079-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 09:51:46 2018
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Subject: [Bug c++/85464] [7 Regression] Wignored-qualifiers is emitted by cc1plus without diagnostics when triggered by a cast operator.
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Looks easy to fix, I'll take it.
>From gcc-bugs-return-602080-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 09:53:25 2018
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
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--- Comment #8 from Martin Jambor <jamborm at gcc dot gnu.org> ---
I believe I understand the issue and will prepare a testcase from scratch.
Possibly after I test/submit the patch if it takes too long. Thanks for your
effort!
>From gcc-bugs-return-602082-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 10:01:59 2018
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Subject: [Bug tree-optimization/85459] [8 Regression] Larger code generated from GMP template meta-programming
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--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #1)
> I think this is a result of many changes.
> E.g. r249885 bumps .s size from 3709 to 4599 bytes, r254724 from 4599 to
> 5768, r255510 from 5772 to 7713. You are compiling with -O3, not -Os, so
> the size is not what counts though, but the code speed, right?
-Os gives something much larger (16633). I agree 100% that what matters at -O3
is code speed, not size, and I am only using the size as a crude indicator
before looking into the code more closely. And what I saw were many extra moves
and some missed __builtin_constant_p opportunities, both of which obviously
have a negative impact on performance. If the only size increase came from
outlining the exception code, that would be fine. But compiling with
-fno-exceptions (after removing enough exception-related unnecessary stuff from
the file so it compiles) still shows an increase from 2639 to 4268.
>From gcc-bugs-return-602081-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 10:01:56 2018
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
Date: Thu, 19 Apr 2018 10:01:00 -0000
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--- Comment #9 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Thanks Martin & Martin! The patch seems to work for me as well.
I did try to minimize it before but it seems the smallest change changes the
conditions for the cloning and it doesn't trigger it anymore.
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Subject: [Bug tree-optimization/85459] [8 Regression] Larger code generated from GMP template meta-programming
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Marc Glisse <glisse at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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is obsolete| |
--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
Created attachment 43985
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preprocessed testcase (slightly reduced, compiles with -fno-exceptions)
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Subject: [Bug libstdc++/85439] mt19937_64 producing unexpected result only in certain configuration
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--- Comment #5 from W E Brown <webrown.cpp at gmail dot com> ---
(In reply to Marc "Foddex" Oude Kotte from comment #4)
> The reason I was expecting the same result everywhere is because of this
> statement on cppreference.com:
>
>
> "Notes
> The 10000th consecutive invocation of a default-contructed std::mt19937 is
> required to produce the value 4123659995.
>
> The 10000th consecutive invocation of a default-contructed std::mt19937_64
> is required to produce the value 9981545732273789042"
>
>
> Source:
> http://en.cppreference.com/w/cpp/numeric/random/mersenne_twister_engine
>
> Obviously I'm not testing the 10000th consecutive invocation but the 1st,
> but I still expected things to be similar (and they are, in 7/8 test cases).
The cited text is correct, but the attached program doesn't test it.
In particular, the attached program tests nothing about calling any Mersenne
twister object; rather, it looks at the results of calling
uniform_int_distribution objects. As specified in C++, distribution objects
are not required to produce identical results across platforms, even if given
identical inputs. Any expectation to the contrary is not supported by the C++
standard.
ISTM that testing the behavior of std::mt19937 and std::mt19937_64 -- or of any
engine, for that matter -- ought not involve any distribution object at all.
Instead, such a test program should IMO be looking at the result(s) of directly
invoking the engine.
Comment #2 was exactly right. I recommend this report be closed as invalid.
>From gcc-bugs-return-602085-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 10:33:40 2018
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Subject: [Bug c++/69733] -Wignored-qualifiers points to wrong const
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
N.B. this caused a regression for conversion operators, see PR 85464.
>From gcc-bugs-return-602086-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 10:33:49 2018
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Subject: [Bug c++/85464] [7 Regression] Wignored-qualifiers is emitted by cc1plus without diagnostics when triggered by a cast operator.
Date: Thu, 19 Apr 2018 10:33:00 -0000
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Trunk prints a location, but it's the wrong one again:
ign.cc:3:25: warning: type qualifiers ignored on function return type
[-Wignored-qualifiers]
operator int const() const; // { dg-error "type qualifiers ignored" }
^~~~~
So this is a regression for gcc-7 and an ordinary bug for gcc-8.
>From gcc-bugs-return-602088-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 10:42:19 2018
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Subject: [Bug testsuite/61606] About GCC install, testing step (mostly check...)
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Works for us.
>From gcc-bugs-return-602087-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 10:42:10 2018
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Subject: [Bug c++/85462] [8 Regression] internal compiler error: in inc_refcount_use, at cp/pt.c:8955
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43986
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gcc8-pr85462.patch
Untested fix, still waiting if reduction comes up with some reasonably sized
testcase.
Confirmed r259457 as commit introducing this regression.
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/85439] mt19937_64 producing unexpected result only in certain configuration
Date: Thu, 19 Apr 2018 10:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85439
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Marc "Foddex" Oude Kotte from comment #4)
> Obviously I'm not testing the 10000th consecutive invocation but the 1st,
No, as Walter explained, you're not even doing that.
If you want to inspect the 1st output of the MT engines, or the 10000th, then
do that:
template<typename Generator, template<typename> class, typename Type>
Type generateRandom() {
return Generator()();
}
If you do this you'll see that every implementation produces the same results
from the mersenne-twisters engines.
Your program inspects the output of std::uniform_input_distribution instead.
The standard says nothing about the exact values it produces, only the
distribution of values given a range of inputs. So as Walter suggested, I'm
closing this as INVALID, as there's no bug here.
(Also, stop using names like _Generator, _Dist and _Type, those are reserved
names, see http://en.cppreference.com/w/cpp/language/identifiers for details).
>From gcc-bugs-return-602090-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 10:55:18 2018
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From: "fernando at info dot unlp.edu.ar" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/61606] About GCC install, testing step (mostly check...)
Date: Thu, 19 Apr 2018 10:55:00 -0000
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--- Comment #5 from Fernando G. Tinetti <fernando at info dot unlp.edu.ar> ---
(In reply to Jürgen Reuter from comment #3)
> Is it really necessary to keep this one here open? Just stumbled on this via
> the discussion on c.l.f. This was with 4.9 which is no longer supported.
> Probably on an OS that is no longer used by the OP.
I understand.
(the current link for the contents I was referring to is
http://fernando.bl.ee/GCC-gfortran-install.html)
Maybe I was the only one with that problem, for which the original questions
possibly remain. I did not try with the new versions.
Thanks anyway, maybe the wrong issues are fixed as time goes by,
Fernando.
>From gcc-bugs-return-602091-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 10:59:52 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/85465] New: [og7, openacc] ICE in mark_vars_oacc_gangprivate, at c/c-parser.c:14213
Date: Thu, 19 Apr 2018 10:59:00 -0000
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Bug ID: 85465
Summary: [og7, openacc] ICE in mark_vars_oacc_gangprivate, at
c/c-parser.c:14213
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$ cat bug.c
int
main (void)
{
#pragma acc parallel
foo ();
return 0;
}
$ ./install/bin/gcc bug.c -fopenacc
bug.c: In function ‘main’:
bug.c:6:3: warning: implicit declaration of function ‘foo’
[-Wimplicit-function-declaration]
foo ();
^~~
bug.c:6:3: internal compiler error: in mark_vars_oacc_gangprivate, at
c/c-parser.c:14213
0x7ecba5 mark_vars_oacc_gangprivate
gcc/c/c-parser.c:14213
0x110d5b8 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, default_hash_traits<tree_node*> >*, tree_node*
(*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*,
hash_set<tree_node*, default_hash_traits<tree_node*> >*))
gcc/tree.c:11832
0x110e32f walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, default_hash_traits<tree_node*> >*, tree_node*
(*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*,
hash_set<tree_node*, default_hash_traits<tree_node*> >*))
gcc/tree.c:12158
0x7edea2 c_parser_oacc_kernels_parallel
gcc/c/c-parser.c:14269
0x7fb762 c_parser_omp_construct
gcc/c/c-parser.c:17580
0x7e2de7 c_parser_pragma
gcc/c/c-parser.c:10372
0x7d5544 c_parser_compound_statement_nostart
gcc/c/c-parser.c:4890
0x7d5015 c_parser_compound_statement
gcc/c/c-parser.c:4755
0x7cfb0a c_parser_declaration_or_fndef
gcc/c/c-parser.c:2128
0x7ce202 c_parser_external_declaration
gcc/c/c-parser.c:1472
0x7cdd98 c_parser_translation_unit
gcc/c/c-parser.c:1352
0x7fd41e c_parse_file()
gcc/c/c-parser.c:18349
0x85aaab c_common_parse_file()
gcc/c-family/c-opts.c:1107
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-602092-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 11:03:43 2018
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From: "cpphackster at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85466] New: Performance is slow when doing 'branchless' conditional style math operations
Date: Thu, 19 Apr 2018 11:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85466
Bug ID: 85466
Summary: Performance is slow when doing 'branchless'
conditional style math operations
Product: gcc
Version: 7.3.0
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I have been investigating turning if statements into math operations inspired
by a blog article...
http://theorangeduck.com/page/avoiding-shader-conditionals
...and other resources listed here...
https://gist.github.com/unitycoder/4d988bb21b3ce820eaa23028ed6d04bd
There are also many 'branchless' type things on stack overflow (like the
signmum function needed for the branchless operations)
https://stackoverflow.com/questions/1903954/is-there-a-standard-sign-function-signum-sgn-in-c-c
I set up a quickbench benchmark to test if this branchless code is faster on
CPU as well.
http://quick-bench.com/o5lYur5c9rVuOyAn6-fzDf6xTuk
It seems that for a case such as...
if (myVector[n] > 0.5){
result[n] = 0.8f;
}
else {
result[n] = 0.1f;
}
...which gets turned into the branchless....
result[n] = lerp(0.1f, 0.8f, when_gt(myVec[n], 0.5f));
...clang runs ~2x faster than the standard if statement (it seems to turn it
into a lot of vectorized code which seems to be many movups)
gcc is very slow compared to even the standard base case.
one suspect part is ~68% of time being spend in one part of the code.
3.00% mulss 0x8(%rsp),%xmm0
67.88% addss %xmm3,%xmm0
4.60% movss %xmm0,(%rbx,%rdx,1)
2.14% add $0x4,%rdx
cmp $0x61a80,%rdx
je 4053a0 <ifNoConditional(benchmark::State&)+0x1d0>
movss 0x0(%rbp,%rdx,1),%xmm0
0.68% xor %eax,%eax
0.45% subss %xmm2,%xmm0
1.89% ucomiss %xmm1,%xmm0
1.47% seta %al
1.85% xor %ecx,%ecx
ucomiss %xmm0,%xmm1
pxor %xmm0,%xmm0
seta %cl
1.17% sub %ecx,%eax
0.90% cvtsi2ss %eax,%xmm0
4.29% ucomiss %xmm0,%xmm1
2.89% movaps %xmm4,%xmm0
jbe 405350 <ifNoConditional(benchmark::State&)+0x180>
3.02% mulss 0xc(%rsp),%xmm0
3.72% jmp 405356 <ifNoConditional(benchmark::State&)+0x186>
I'm happy to help out with testing any build or fixes for this. My assembly
knowledge is limited but willing to help out where possible/run benchmarks etc.
Cheers
Dan
>From gcc-bugs-return-602093-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 11:09:31 2018
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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85467] New: [8 Regression] ICE: verify_gimple failed: non-trivial conversion at assignment with -O2 -fno-tree-ccp --param=sccvn-max-scc-size\x10
Date: Thu, 19 Apr 2018 11:09:00 -0000
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Bug ID: 85467
Summary: [8 Regression] ICE: verify_gimple failed: non-trivial
conversion at assignment with -O2 -fno-tree-ccp
--param=sccvn-max-scc-size=10
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: ice-on-valid-code
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Priority: P3
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Reporter: zsojka at seznam dot cz
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Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 43987
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43987&action=edit
reduced testcase
This looks very similar to PR85195
The ICE can be reproduced with any of the typedefs:
typedef char T;
typedef short T;
typedef int T;
typedef long T;
typedef long long T;
typedef __int128 T;
as long as the vector has just 1 member.
Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 -fno-tree-ccp --param=sccvn-max-scc-size=10
testcase.c
testcase.c: In function 'foo':
testcase.c:24:1: error: non-trivial conversion at assignment
}
^
vector(1) char
char
_5 = 0;
testcase.c:24:1: error: non-trivial conversion at assignment
V
char
_8 = 0;
during GIMPLE pass: forwprop
testcase.c:24:1: internal compiler error: verify_gimple failed
0xdbaca9 verify_gimple_in_cfg(function*, bool)
/repo/gcc-trunk/gcc/tree-cfg.c:5585
0xc37613 execute_function_todo
/repo/gcc-trunk/gcc/passes.c:1994
0xc37f59 execute_todo
/repo/gcc-trunk/gcc/passes.c:2048
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.
x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-259457-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-259457-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
gcc version 8.0.1 20180418 (experimental) (GCC)
$
>From gcc-bugs-return-602094-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 11:10:34 2018
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From: "foddex at foddex dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/85439] mt19937_64 producing unexpected result only in certain configuration
Date: Thu, 19 Apr 2018 11:10:00 -0000
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--- Comment #7 from Marc "Foddex" Oude Kotte <foddex at foddex dot net> ---
OK. My apologies for the confusion, and thanks for the clarification!
>From gcc-bugs-return-602095-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 11:12:47 2018
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Subject: [Bug c++/85466] Performance is slow when doing 'branchless' conditional style math operations
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--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
Please always include your code in the bug report (this external website
doesn't even seem to have a "download the code" option).
>From gcc-bugs-return-602096-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 11:25:10 2018
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Subject: [Bug tree-optimization/85467] [8 Regression] ICE: verify_gimple failed: non-trivial conversion at assignment with -O2 -fno-tree-ccp --param=sccvn-max-scc-size\x10
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r247092.
>From gcc-bugs-return-602097-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 11:25:14 2018
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Subject: [Bug c++/61982] Optimizer does not eliminate stores to destroyed objects
Date: Thu, 19 Apr 2018 11:25:00 -0000
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--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The C++ standard. Specifically, [basic.life].
After the constructor runs and before the destructor runs, that memory location
contains an object of type X. After the destructor finishes you can reuse the
storage for another object.
The memcmp calls treats the storage as an array of unsigned char and can
implicitly begin the lifetime of an array of unsigned char because unsigned
char does not have non-vacuous initialization (i.e. it doesn't need to be
initialized). However, if you don't initialize those characters then they have
indeterminate values.
So the first memcmp call reuses the storage to create an array of unsigned char
with indeterminate values. That ends the lifetime of the X (without calling the
destructor). Then you call the destructor on an object that already ended its
lifetime, which is undefined. Then you reuse it as an array of unsigned char
again, and it still has indeterminate values.
Even if we ignore the UB caused by invoking the destructor for an object that
no logner exists, the value representation of the X cannot be inspected by
memcmp, because X is not trivially copyable, and since the values are
indeterminate there is no requirement for the values written by the destructor
to be observable.
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Subject: [Bug c++/85466] Performance is slow when doing 'branchless' conditional style math operations
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>From gcc-bugs-return-602099-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 11:25:36 2018
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Subject: [Bug tree-optimization/85467] [8 Regression] ICE: verify_gimple failed: non-trivial conversion at assignment with -O2 -fno-tree-ccp --param=sccvn-max-scc-size\x10
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I'll have a look.
>From gcc-bugs-return-602100-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 11:37:41 2018
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Subject: [Bug tree-optimization/85467] [8 Regression] ICE: verify_gimple failed: non-trivial conversion at assignment with -O2 -fno-tree-ccp --param=sccvn-max-scc-size\x10
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Must be some match.pd pattern again.
>From gcc-bugs-return-602101-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 11:43:35 2018
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Subject: [Bug c++/85466] Performance is slow when doing 'branchless' conditional style math operations
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Blocks| |53947
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
>From the webpage you seem to just use -O3 -std=c++17, the assembly shows the
branchless code isn't vectorized.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
>From gcc-bugs-return-602102-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 11:46:50 2018
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Subject: [Bug c++/85466] Performance is slow when doing 'branchless' conditional style math operations
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James Greenhalgh <jgreenhalgh at gcc dot gnu.org> changed:
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--- Comment #3 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
Created attachment 43988
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43988&action=edit
Reduced testcase
I believe this testcase shows the issue being reported here. Clang seems to
spot this is essentially a memset across the array, while GCC doesn't.
On AArch64 with Clang:
.LBB1_9: // =>This Inner Loop Header: Depth=1
stp q0, q0, [x8, #-16]
subs x20, x20, #8 // =8
add x8, x8, #32 // =32
b.ne .LBB1_9
On x86-64 with Clang:
.LBB1_9: # =>This Inner Loop Header: Depth=1
movups %xmm0, -144(%rax,%rcx,4)
movups %xmm0, -128(%rax,%rcx,4)
movups %xmm0, -112(%rax,%rcx,4)
movups %xmm0, -96(%rax,%rcx,4)
movups %xmm0, -80(%rax,%rcx,4)
movups %xmm0, -64(%rax,%rcx,4)
movups %xmm0, -48(%rax,%rcx,4)
movups %xmm0, -32(%rax,%rcx,4)
movups %xmm0, -16(%rax,%rcx,4)
movups %xmm0, (%rax,%rcx,4)
addq $40, %rcx
cmpq $100036, %rcx # imm = 0x186C4
jne .LBB1_9
GCC doesn't spot this.
On the other hand G++'s inlining of the various random number initialisation
routines really hammers Clang, which ends up emulating 128-bit arithmetic on
AArch64.
>From gcc-bugs-return-602103-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 11:52:43 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85462] [8 Regression] internal compiler error: in inc_refcount_use, at cp/pt.c:8955
Date: Thu, 19 Apr 2018 11:52:00 -0000
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--- Comment #3 from Manuel Lauss <manuel.lauss at googlemail dot com> ---
(In reply to Jakub Jelinek from comment #2)
> Created attachment 43986 [details]
> gcc8-pr85462.patch
>
> Untested fix, still waiting if reduction comes up with some reasonably sized
> testcase.
It does fix the issue.
>From gcc-bugs-return-602104-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 11:57:02 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85466] Performance is slow when doing 'branchless' conditional style math operations
Date: Thu, 19 Apr 2018 11:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85466
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
On x86_64 somehow x87 math ends up being used. Huh. I also see calls to
nextafter() in the assembly?! Note you need sth better than SSE2 to vectorize
the spaghetti, AVX2 does it for me.
>From gcc-bugs-return-602105-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 12:01:51 2018
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Subject: [Bug libstdc++/85466] Performance is slow when doing 'branchless' conditional style math operations
Date: Thu, 19 Apr 2018 12:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85466
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jwakely.gcc at gmail dot com
Component|c++ |libstdc++
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
I see sth like
template<typename _RealType, size_t __bits,
typename _UniformRandomNumberGenerator>
_RealType
generate_canonical(_UniformRandomNumberGenerator& __urng)
{
...
__ret = std::nextafter(_RealType(1), _RealType(0));
instantiated as
_RealType std::generate_canonical(_UniformRandomNumberGenerator&) [with
_RealType = double; long unsigned int __bits = 53;
_UniformRandomNumberGenerator = std::mersenne_twister_engine<long unsigned int,
32, 624, 397, 31, 2567483615, 11, 4294967295, 7, 2636928640, 15, 4022730752,
18, 1812433253>] (struct mersenne_twister_engine & __urng)
{
...
const long double __r;
^^^
(but that's unused it seems)
...
__ret = nextafter (1.0e+0, 0.0);
and cmath containing
constexpr float
nextafter(float __x, float __y)
{ return __builtin_nextafterf(__x, __y); }
constexpr long double
nextafter(long double __x, long double __y)
{ return __builtin_nextafterl(__x, __y); }
template<typename _Tp, typename _Up>
constexpr typename __gnu_cxx::__promote_2<_Tp, _Up>::__type
nextafter(_Tp __x, _Up __y)
{
typedef typename __gnu_cxx::__promote_2<_Tp, _Up>::__type __type;
return nextafter(__type(__x), __type(__y));
}
which means std::nextafter will use the long double variant?
>From gcc-bugs-return-602106-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 12:10:35 2018
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Subject: [Bug libstdc++/85466] Performance is slow when doing 'branchless' conditional style math operations
Date: Thu, 19 Apr 2018 12:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85466
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #5)
> I see sth like
>
> template<typename _RealType, size_t __bits,
> typename _UniformRandomNumberGenerator>
> _RealType
> generate_canonical(_UniformRandomNumberGenerator& __urng)
> {
> ...
> __ret = std::nextafter(_RealType(1), _RealType(0));
>
> instantiated as
>
> _RealType std::generate_canonical(_UniformRandomNumberGenerator&) [with
> _RealType = double; long unsigned int __bits = 53;
> _UniformRandomNumberGenerator = std::mersenne_twister_engine<long unsigned
> int, 32, 624, 397, 31, 2567483615, 11, 4294967295, 7, 2636928640, 15,
> 4022730752, 18, 1812433253>] (struct mersenne_twister_engine & __urng)
> {
> ...
> const long double __r;
> ^^^
> (but that's unused it seems)
> ...
> __ret = nextafter (1.0e+0, 0.0);
>
> and cmath containing
>
> constexpr float
> nextafter(float __x, float __y)
> { return __builtin_nextafterf(__x, __y); }
>
> constexpr long double
> nextafter(long double __x, long double __y)
> { return __builtin_nextafterl(__x, __y); }
>
>
>
> template<typename _Tp, typename _Up>
> constexpr typename __gnu_cxx::__promote_2<_Tp, _Up>::__type
> nextafter(_Tp __x, _Up __y)
> {
> typedef typename __gnu_cxx::__promote_2<_Tp, _Up>::__type __type;
> return nextafter(__type(__x), __type(__y));
> }
>
> which means std::nextafter will use the long double variant?
Ah, and in the same function:
_3 = (long double) __tmp;
_4 = _3 * 4.294967296e+9;
__tmp = (double) _4;
likely from
const long double __r = static_cast<long double>(__urng.max())
- static_cast<long double>(__urng.min()) + 1.0L;
the loop to be vectorized is
<bb 32> [1.36%]:
# n_315 = PHI <0(31), n_290(35)>
# ivtmp_313 = PHI <10000000(31), ivtmp_289(35)>
_312 = (long unsigned int) n_315;
_311 = _312 * 4;
_310 = _82 + _311;
_309 = *_310;
_308 = _309 - 5.0e-1;
_307 = _308 > 0.0;
_306 = (int) _307;
_305 = _308 < 0.0;
_304 = (int) _305;
_303 = _306 - _304;
_302 = (float) _303;
if (_302 < 0.0)
goto <bb 34>; [36.00%]
else
goto <bb 33>; [64.00%]
<bb 33> [0.87%]:
<bb 34> [1.37%]:
# _301 = PHI <&D.56316(32), &D.56315(33)>
D.56315 ={v} {CLOBBER};
D.56316 ={v} {CLOBBER};
_298 = *_301;
_297 = _298 * 6.99999988079071044921875e-1;
_296 = _297 + 1.00000001490116119384765625e-1;
_295 = pretmp_336 + _311;
*_295 = _296;
n_290 = n_315 + 1;
ivtmp_289 = ivtmp_313 - 1;
if (ivtmp_289 == 0)
goto <bb 36>; [1.01%]
else
goto <bb 35>; [98.99%]
<bb 35> [1.36%]:
goto <bb 32>; [100.00%]
which failed to if-convert, quite possibly because of the strange clobbers.
Which means the testcase is likely undefined as well.
>From gcc-bugs-return-602107-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 12:11:25 2018
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Subject: [Bug libstdc++/85466] Performance is slow when doing 'branchless' conditional style math operations
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85466
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #5)
> I see sth like
>
> template<typename _RealType, size_t __bits,
> typename _UniformRandomNumberGenerator>
> _RealType
> generate_canonical(_UniformRandomNumberGenerator& __urng)
> {
> ...
> __ret = std::nextafter(_RealType(1), _RealType(0));
>
> instantiated as
>
> _RealType std::generate_canonical(_UniformRandomNumberGenerator&) [with
> _RealType = double; long unsigned int __bits = 53;
> _UniformRandomNumberGenerator = std::mersenne_twister_engine<long unsigned
> int, 32, 624, 397, 31, 2567483615, 11, 4294967295, 7, 2636928640, 15,
> 4022730752, 18, 1812433253>] (struct mersenne_twister_engine & __urng)
> {
> ...
> const long double __r;
> ^^^
> (but that's unused it seems)
It's used to calculate __log2r which is the maximum range of the random bit
generator __urng.
> ...
> __ret = nextafter (1.0e+0, 0.0);
>
> and cmath containing
>
> constexpr float
> nextafter(float __x, float __y)
> { return __builtin_nextafterf(__x, __y); }
>
> constexpr long double
> nextafter(long double __x, long double __y)
> { return __builtin_nextafterl(__x, __y); }
>
>
>
> template<typename _Tp, typename _Up>
> constexpr typename __gnu_cxx::__promote_2<_Tp, _Up>::__type
> nextafter(_Tp __x, _Up __y)
> {
> typedef typename __gnu_cxx::__promote_2<_Tp, _Up>::__type __type;
> return nextafter(__type(__x), __type(__y));
> }
And also:
using ::nextafter;
> which means std::nextafter will use the long double variant?
No, in the instantiation of generate_canonical<double, ...> it uses the
nextafter(double, double) from libc that's added to namespace std by "using
::nextafter".
>From gcc-bugs-return-602108-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 12:12:10 2018
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Subject: [Bug libstdc++/85466] Performance is slow when doing 'branchless' conditional style math operations
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to James Greenhalgh from comment #3)
> Created attachment 43988 [details]
> Reduced testcase
>
> I believe this testcase shows the issue being reported here. Clang seems to
> spot this is essentially a memset across the array, while GCC doesn't.
>
> On AArch64 with Clang:
>
> .LBB1_9: // =>This Inner Loop Header:
> Depth=1
> stp q0, q0, [x8, #-16]
> subs x20, x20, #8 // =8
> add x8, x8, #32 // =32
> b.ne .LBB1_9
>
> On x86-64 with Clang:
>
> .LBB1_9: # =>This Inner Loop Header: Depth=1
> movups %xmm0, -144(%rax,%rcx,4)
> movups %xmm0, -128(%rax,%rcx,4)
> movups %xmm0, -112(%rax,%rcx,4)
> movups %xmm0, -96(%rax,%rcx,4)
> movups %xmm0, -80(%rax,%rcx,4)
> movups %xmm0, -64(%rax,%rcx,4)
> movups %xmm0, -48(%rax,%rcx,4)
> movups %xmm0, -32(%rax,%rcx,4)
> movups %xmm0, -16(%rax,%rcx,4)
> movups %xmm0, (%rax,%rcx,4)
> addq $40, %rcx
> cmpq $100036, %rcx # imm = 0x186C4
> jne .LBB1_9
>
> GCC doesn't spot this.
I bet clang is clever on the undefinedness I pointed out.
> On the other hand G++'s inlining of the various random number initialisation
> routines really hammers Clang, which ends up emulating 128-bit arithmetic on
> AArch64.
>From gcc-bugs-return-602109-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 12:18:25 2018
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Subject: [Bug libstdc++/85466] Performance is slow when doing 'branchless' conditional style math operations
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--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is undefined:
template <typename T>
inline auto when_greater_then(T x, T y) -> decltype(std::max(sign(x - y),
T(0))) {
return std::max(sign(x - y), T(0));
}
The return type of std::max is a reference to one of its arguments, so the
decltype expression is a reference, and you end up returning a reference to a
local temporary.
This would fix that problem:
template <typename T>
inline auto when_greater_then(T x, T y)
-> std::remove_reference_t<decltype(std::max(sign(x - y), T(0)))> {
return std::max(sign(x - y), T(0));
}
But it's dumb anyway, because the return type of std::max<T> is T& so you don't
need to use decltype and remove_reference to know the type.
template <typename T>
inline T when_greater_then(T x, T y)
{
return std::max(sign(x - y), T(0));
}
Much simpler, no dangling references.
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Subject: [Bug libstdc++/85466] Performance is slow when doing 'branchless' conditional style math operations
Date: Thu, 19 Apr 2018 12:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85466
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
And you need -fno-trapping-math to allow if-conversion. Then things are fast.
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Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
Date: Thu, 19 Apr 2018 12:42:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |FIXED
--- Comment #18 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed (hopefully).
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Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
Date: Thu, 19 Apr 2018 12:42:00 -0000
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--- Comment #19 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Apr 19 12:41:42 2018
New Revision: 259493
URL: https://gcc.gnu.org/viewcvs?rev=259493&root=gcc&view=rev
Log:
2018-04-19 Richard Biener <rguenther@suse.de>
PR tree-optimization/84737
* tree-vect-data-refs.c (vect_copy_ref_info): New function
copying restrict info.
(vect_setup_realignment): Use it.
* tree-vectorizer.h (vect_copy_ref_info): Declare.
* tree-vect-stmts.c (vectorizable_store): Copy ref info from
the first DR to all generated stores.
(vectorizable_load): Likewise for loads.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-vect-data-refs.c
trunk/gcc/tree-vect-stmts.c
trunk/gcc/tree-vectorizer.h
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Subject: [Bug middle-end/26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)
Date: Thu, 19 Apr 2018 12:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
Bug 26163 depends on bug 84737, which changed state.
Bug 84737 Summary: [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84737
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>From gcc-bugs-return-602114-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 12:45:55 2018
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Subject: [Bug c++/84588] [8 Regression] internal compiler error: Segmentation fault (contains_struct_check())
Date: Thu, 19 Apr 2018 12:45:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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CC| |paolo.carlini at oracle dot com
--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
I believe that for the regression we want something like (it tests fine):
Index: parser.c
===================================================================
--- parser.c (revision 259489)
+++ parser.c (working copy)
@@ -21358,6 +21358,8 @@ cp_parser_parameter_declaration_list (cp_parser* p
{
*is_error = true;
parameters = error_mark_node;
+ if (parser->fully_implicit_function_template_p)
+ abort_fully_implicit_template (parser);
break;
}
Then the diagnostic is not perfect (a spurious final warning) but is exactly
the same we issue for, say:
struct a {
void b() {}
void c(auto = [] {
if (a a(int int){})
;
}) {}
};
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Subject: [Bug ipa/85447] [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
Date: Thu, 19 Apr 2018 12:50:00 -0000
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Martin Jambor <jamborm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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is obsolete| |
--- Comment #8 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Created attachment 43989
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43989&action=edit
Fix undergoing testing
This version of the fix replaces a bool parameter with a hash_set, which
actually corresponds to what I intended to do in the first place. It also
contains a testcase that was miscompiled with the previous version.
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
Date: Thu, 19 Apr 2018 12:57:00 -0000
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--- Comment #10 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Created attachment 43990
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Simple testcase
This is a simple testcase. Let me prepare the final patch then.
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Subject: [Bug tree-optimization/85467] [8 Regression] ICE: verify_gimple failed: non-trivial conversion at assignment with -O2 -fno-tree-ccp --param=sccvn-max-scc-size\x10
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43991
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43991&action=edit
gcc8-pr85467.patch
fold-const.c this time. Untested patch.
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Subject: [Bug libstdc++/85466] Performance is slow when doing 'branchless' conditional style math operations
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--- Comment #11 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
With Jonathon's suggested change, copied in to the original poster's framework
(without -fno-trapping-math), Clang hot loop ( score: 165065
http://quick-bench.com/6NaD8ay0f8qMh9n0aMriYEiuKNA ) is:
0.16% movups 0x61a80(%r15,%rax,4),%xmm6
1.15% movups 0x61a90(%r15,%rax,4),%xmm7
0.60% movaps %xmm1,%xmm3
5.44% cmpltps %xmm6,%xmm3
0.44% movaps %xmm1,%xmm6
0.40% cmpltps %xmm7,%xmm6
0.44% movaps %xmm5,%xmm7
4.97% andps %xmm3,%xmm7
0.20% andnps %xmm4,%xmm3
0.36% orps %xmm7,%xmm3
1.04% movaps %xmm5,%xmm7
4.97% andps %xmm6,%xmm7
0.11% andnps %xmm4,%xmm6
4.95% orps %xmm7,%xmm6
5.53% movups %xmm3,0x61a80(%rbx,%rax,4)
0.47% movups %xmm6,0x61a90(%rbx,%rax,4)
4.42% movups 0x61aa0(%r15,%rax,4),%xmm3
20.42% movups 0x61ab0(%r15,%rax,4),%xmm6
1.00% movaps %xmm1,%xmm7
0.49% cmpltps %xmm3,%xmm7
9.79% movaps %xmm1,%xmm3
0.16% cmpltps %xmm6,%xmm3
2.26% movaps %xmm5,%xmm6
0.60% andps %xmm7,%xmm6
4.20% andnps %xmm4,%xmm7
1.18% orps %xmm6,%xmm7
2.22% movaps %xmm5,%xmm6
0.47% andps %xmm3,%xmm6
4.24% andnps %xmm4,%xmm3
4.88% movups %xmm7,0x61aa0(%rbx,%rax,4)
0.27% orps %xmm6,%xmm3
5.22% movups %xmm3,0x61ab0(%rbx,%rax,4)
6.02% add $0x10,%rax
jne 405b30 <ifStandard(benchmark::State&)+0x4a0>
GCC hot loop ( score: 2385754
http://quick-bench.com/ehLe-aqkpXkkx2sHLd6TWq_p4g4 ) is:
0.56% movss 0x0(%rbp,%rdx,1),%xmm0
1.47% xor %eax,%eax
2.00% subss %xmm2,%xmm0
7.02% ucomiss %xmm1,%xmm0
6.77% seta %al
4.96% xor %ecx,%ecx
0.25% ucomiss %xmm0,%xmm1
0.84% pxor %xmm0,%xmm0
0.09% seta %cl
5.40% sub %ecx,%eax
3.22% cvtsi2ss %eax,%xmm0
9.87% ucomiss %xmm0,%xmm1
6.53% ja 4053a8 <ifNoConditional(benchmark::State&)+0x1d8>
10.24% mulss %xmm4,%xmm0
11.55% addss %xmm3,%xmm0
5.46% movss %xmm0,(%rbx,%rdx,1)
2.00% add $0x4,%rdx
cmp $0x61a80,%rdx
jne 405350 <ifNoConditional(benchmark::State&)+0x180>
Daniel Elliott does that better match your expectations? If so, I think this
can be resolved as missed optimization of invalid code.
>From gcc-bugs-return-602119-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 13:24:53 2018
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Subject: [Bug rtl-optimization/85455] [8 Regression] ICE in verify_loop_structure, at cfgloop.c:1708 (error: basic block 3 should be marked irreducible)
Date: Thu, 19 Apr 2018 13:24:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |ice-checking
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
patch posted
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Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
Date: Thu, 19 Apr 2018 13:25:00 -0000
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--- Comment #20 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #18)
> Fixed (hopefully).
Yes, mgrid performance is back. Thanks.
>From gcc-bugs-return-602122-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 13:33:51 2018
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Subject: [Bug c++/85464] [7 Regression] Wignored-qualifiers is emitted by cc1plus without diagnostics when triggered by a cast operator.
Date: Thu, 19 Apr 2018 13:33:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-04/msg00951.html
I've created PR 85468 for the wrong location, so this one is just about the
regression in gcc-7-branch.
>From gcc-bugs-return-602121-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 13:33:15 2018
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Subject: [Bug c++/85468] New: Wrong location for -Wignored-qualifiers diagnostic on conversion operator
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Bug ID: 85468
Summary: Wrong location for -Wignored-qualifiers diagnostic on
conversion operator
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
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struct Test {
operator int const() const; // { dg-error "type qualifiers ignored" }
};
ign.cc:2:25: warning: type qualifiers ignored on function return type
[-Wignored-qualifiers]
operator int const() const; // { dg-error "type qualifiers ignored" }
^~~~~
The location should point to the first const.
This is the subject of PR 69733 but that fix didn't cover conversion operators.
>From gcc-bugs-return-602123-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 13:42:16 2018
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Thu, 19 Apr 2018 13:42:00 -0000
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |ebotcazou at gcc dot gnu.org
--- Comment #35 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> A port does not need maintenance only for that port, and its users, but also
> for GCC itself. All ports are a cost to _all_ GCC developers. If a port is
> not maintained it has to be removed.
Do you IBM guys have a hidden agenda to bury the left-overs of Freescale? ;-)
The SPE port has already been moved out of the way so I don't really see the
point in further hammering it like that; there are plenty of obsolete ports in
the tree that would have to removed before this one if the above criterion was
followed to the letter.
>From gcc-bugs-return-602124-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 13:49:13 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, 19 Apr 2018 13:49:00 -0000
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--- Comment #36 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to Jakub Jelinek from comment #33)
> Yes, but the port split was done in May last year, and nothing substantial
> happened since then. Port maintainance is not about promises, but about
> doing the work. If he does the work soon, the port can be de-obsoleted in
> GCC9, otherwise it will be removed, which doesn't mean it can't be added at
> some point later. Of course, the later it will be done, the harder it will
> be.
He is working on it and people are using it. It's not surprising that it takes
longer than any work done by paid developers on the x86 or POWER targets.
> > > m68k needs some serious work, too, in the not far future (if the cc0 removal
> > > finally goes through -- that has been over ten years now).
> >
> > Yes, I am aware of that. But there are enough people interested in such work
> > so I think we will be able get around doing that at some point.
>
> Nobody did the work in the last 15+ years for m68k, it doesn't seem likely
> that all of sudden it will happen. There have been numerous posts about
> what to do to get rid of cc0, e.g. in 2005 and several other years.
> See https://gcc.gnu.org/backends.html for details, a healthy port doesn't
> have
> c (cc0), p (not using define_peephole2), has a (uses LRA). We can't
> maintain old reload, or cc0 support indefinitely.
I have been doing some research yesterday myself and couldn't find a page which
documents on how to write a port. I couldn't even find documentation on the cc0
stuff.
> > > A port does not need maintenance only for that port, and its users, but also
> > > for GCC itself. All ports are a cost to _all_ GCC developers. If a port is
> > > not maintained it has to be removed.
> >
> > So, again my question is: What exactly is the with the powerpcspe target at
> > the moment and why does upstream claim the port is broken when it apparently
> > works for us in Debian? Am I missing something?
>
> Have you read all the threads mentioned in
> https://gcc.gnu.org/ml/gcc/2018-04/msg00102.html
> and all the above comments? All the details are in there.
Could you please just mention issue in question that causes trouble? The
messages directly linked only mention PR81084 but I haven't run into this issue
myself.
Again, could you please mention an urgent issue with the powerpcspe target that
causes serious issues for other users or developers? Thanks!
>From gcc-bugs-return-602125-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 13:51:30 2018
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Thu, 19 Apr 2018 13:51:00 -0000
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--- Comment #37 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Not sure about IBM, I as a GCC developer and RM have major problem with the
amount of dead code in the port, because anyone who makes changes to the
middle-end that need backend changes will waste time adjusting code that is
dead and can't be really tested (all the Altivec/VMX code, all the 64-bit
support in there, all the power6/7/8/9, all the floating point modes stuff,
etc.). Furthermore the lack of -mno-lra removal in it. If somebody is willing
to change all backends rather than waiting on target maintainers to fix stuff
up, at least the work should not be wasted on dead code. Just look e.g. how
many times in the last year Richard Sandiford modified this dead code in
config/powerpcspe. That is pretty much all wasted effort (others too).
>From gcc-bugs-return-602126-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 13:52:31 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, 19 Apr 2018 13:52:00 -0000
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--- Comment #38 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to Eric Botcazou from comment #35)
> Do you IBM guys have a hidden agenda to bury the left-overs of Freescale? ;-)
I thought Jakub works for RedHat?
> The SPE port has already been moved out of the way so I don't really see the
> point in further hammering it like that; there are plenty of obsolete ports
> in the tree that would have to removed before this one if the above
> criterion was followed to the letter.
To be honest: I made this experience already in multiple projects. IBM
employees have been quite unfriendly towards PPC targets which were not POWER8
or newer. The answer was usually "Anything lower than POWER8 is no longer
supported." talking as if the project in question belongs to IBM. Quite
frustrating.
>From gcc-bugs-return-602127-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 13:53:48 2018
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Subject: [Bug rtl-optimization/85455] [8 Regression] ICE in verify_loop_structure, at cfgloop.c:1708 (error: basic block 3 should be marked irreducible)
Date: Thu, 19 Apr 2018 13:53:00 -0000
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Apr 19 13:53:06 2018
New Revision: 259494
URL: https://gcc.gnu.org/viewcvs?rev=259494&root=gcc&view=rev
Log:
2018-04-19 Richard Biener <rguenther@suse.de>
PR middle-end/85455
* cfg.c (clear_bb_flags): When loop state says we have
marked irreducible regions also preserve BB_IRREDUCIBLE_LOOP.
* gcc.dg/pr85455.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/pr85455.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/cfg.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-602128-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:01:00 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, 19 Apr 2018 14:01:00 -0000
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--- Comment #39 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to Jakub Jelinek from comment #37)
> Not sure about IBM, I as a GCC developer and RM have major problem with the
> amount of dead code in the port, because anyone who makes changes to the
> middle-end that need backend changes will waste time adjusting code that is
> dead and can't be really tested (all the Altivec/VMX code, all the 64-bit
> support in there, all the power6/7/8/9, all the floating point modes stuff,
> etc.).
It's not a waste of time if people are actually still using the code which is
the case for both PowerPCSPE and m68k. I don't understand why some people think
it's acceptable to kill open source stuff that is actively being used by
others.
> Furthermore the lack of -mno-lra removal in it. If somebody is
> willing to change all backends rather than waiting on target maintainers to
> fix stuff up, at least the work should not be wasted on dead code. Just
> look e.g. how many times in the last year Richard Sandiford modified this
> dead code in config/powerpcspe. That is pretty much all wasted effort
> (others too).
I think your problem lies in the fact that you are solely seeing this from the
gcc maintainers perspective (which I cannot blame you for and which is not
surprising). However, you have to keep in mind that - in the end - gcc is a
product that people are using for productive work. So, there has to be a
balance between the objective quality of the code and the usefulness of the
project.
If I understand Eric correctly, the PowerPCSPE backend has been split off from
the other PPC code so as long as the code works and people are using it (and
with someone even working on updating it), why the hurry to remove it?
>From gcc-bugs-return-602129-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:03:23 2018
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Subject: [Bug debug/81307] [8 regression] g++.dg/debug/debug9.C -gstabs FAILs
Date: Thu, 19 Apr 2018 14:03:00 -0000
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--- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
Thanks Jakub, I can confirm I don't see any other UBSANs related to gstabs in
the test-suite.
>From gcc-bugs-return-602130-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:04:53 2018
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Thu, 19 Apr 2018 14:04:00 -0000
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--- Comment #40 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
Is there documentation like this for gcc?
> https://llvm.org/docs/WritingAnLLVMBackend.html
Would be very useful for people wanting to help with the old backends.
>From gcc-bugs-return-602131-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:05:06 2018
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Subject: [Bug objc/50909] Process "#pragma options align=reset" correctly on Mac OS X
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |iains at gcc dot gnu.org,
| |mikestump at comcast dot net
--- Comment #11 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Manuel López-Ibáñez from comment #9)
> (In reply to Alex from comment #8)
> > As to someone implementing clang behavior: I was under the impression that
> > the attached patch just needed to be applied? That is why I was inquiring as
> > to why nobody had applied it after 3 years.
>
> Writing a patch is often the easy part. The hard part is getting the patch
> approved and following up on reviewer's comments. See
> https://gcc.gnu.org/contribute.html and https://gcc.gnu.org/wiki/GCC_Research
>
> The patch doesn't look correct to me anyway, but you will get a better
> review from a Darwin maintainer, see the MAINTAINERS file in the gcc sources.
Adding them on cc (Only Mike is currently listed as a Darwin maintainer, but
IMO Iain ought to be listed as one, too)
>From gcc-bugs-return-602132-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:11:26 2018
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Thu, 19 Apr 2018 14:11:00 -0000
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--- Comment #41 from David Edelsohn <dje at gcc dot gnu.org> ---
SPE mostly is a separate architecture that happens to share many of the basic
mnemonics with PowerPC. Maintaining the SPE port was a burden to the
Power/PowerPC maintainers. As discussed in the other threads, despite years of
promises, the SPE port was not maintained, not even regular testsuite results.
The communication mostly consisted of bug reports raised a year after the patch
or release.
In regard to IBM employee response to PowerPC targets older than Power8, you
said yourself that these are IBM employees. They are directed to work on
specific projects and patches. Sometimes IBM developers can become too focused
on the Power8 and later issue and include portability in their design, but IBM
also is not a general support center for all PowerPC. IBM is a business. As
with all commercially-supported Open Source projects and all forms of work in
general, some developers have broader interest in the project and others
approach it as a job.
>From gcc-bugs-return-602134-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:13:37 2018
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
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--- Comment #30 from Martin Sebor <msebor at gcc dot gnu.org> ---
Richard, I offered to write a proposal (with Clark) to improve the rules. With
the object model proposals already in the pipeline (N2223) this is a good time
to review them and see if it makes sense to extend or change them to also cover
this case in an acceptable way. It would be helpful if you could take some
time to summarize your main concerns or suggestions for changes in this area.
I can start working on the proposal for the fall 2018 WG14 meeting.
>From gcc-bugs-return-602135-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:13:54 2018
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Thu, 19 Apr 2018 14:13:00 -0000
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--- Comment #43 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 19 Apr 2018, glaubitz at physik dot fu-berlin.de wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81084
>
> --- Comment #40 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
> Is there documentation like this for gcc?
>
> > https://llvm.org/docs/WritingAnLLVMBackend.html
>
> Would be very useful for people wanting to help with the old backends.
The wiki has some material, a quick search finds
https://gcc.gnu.org/wiki/WritingANewBackEnd not sure how useful or
up-to-date it is.
>From gcc-bugs-return-602133-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:13:11 2018
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Thu, 19 Apr 2018 14:13:00 -0000
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--- Comment #42 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
See e.g. https://gcc.gnu.org/onlinedocs/gccint/
https://gcc.gnu.org/onlinedocs/gccint/#toc-RTL-Representation
https://gcc.gnu.org/onlinedocs/gccint/Machine-Desc.html#Machine-Desc
https://kristerw.blogspot.cz/2017/08/writing-gcc-backend_4.html
and many others. Don't really know how is writing a new backend relevant to
maintaining an existing one.
>From gcc-bugs-return-602136-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:14:33 2018
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Subject: [Bug libstdc++/85466] Performance is slow when doing 'branchless' conditional style math operations
Date: Thu, 19 Apr 2018 14:14:00 -0000
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--- Comment #12 from Marc Glisse <glisse at gcc dot gnu.org> ---
Constant folding for nextafter seems like a useful thing to add, whatever we
say about the rest of the testcase.
>From gcc-bugs-return-602137-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:16:44 2018
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Subject: [Bug objc/53905] -Wformat-nonliteral gives false positives with __attribute__((format(NSString,...)))
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |iains at gcc dot gnu.org,
| |mikestump at comcast dot net
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
Adding objc maintainers on cc
>From gcc-bugs-return-602138-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:18:09 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
Date: Thu, 19 Apr 2018 14:18:00 -0000
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--- Comment #44 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to David Edelsohn from comment #41)
> SPE mostly is a separate architecture that happens to share many of the
> basic mnemonics with PowerPC. Maintaining the SPE port was a burden to the
> Power/PowerPC maintainers. As discussed in the other threads, despite years
> of promises, the SPE port was not maintained, not even regular testsuite
> results. The communication mostly consisted of bug reports raised a year
> after the patch or release.
Those are apparent mistakes made in the past. I am happy to provide testsuite
results starting next week. As I said, gcc-8 is stable at the moment on real
PowerPCSPE hardware.
> In regard to IBM employee response to PowerPC targets older than Power8, you
> said yourself that these are IBM employees. They are directed to work on
> specific projects and patches. Sometimes IBM developers can become too
> focused on the Power8 and later issue and include portability in their
> design, but IBM also is not a general support center for all PowerPC. IBM is
> a business. As with all commercially-supported Open Source projects and all
> forms of work in general, some developers have broader interest in the
> project and others approach it as a job.
I understand how that works. No one is actually asking IBM people to fix
anything if they don't want to. But I have a problem with people removing
working code that people are using and then dismissing it with answers like the
one I received. It would be different if project X belongs to IBM.
One of such examples was that POWER5 support was forcefully removed by IBM
people from Golang. They claimed that this move was urgently necessary to
reduce maintenance burden. Yet all that was needed to get Golang working again
on POWER5 was to revert three patches and slightly modify them. I am still
rebasing it regularly without any problems.
>From gcc-bugs-return-602139-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:19:35 2018
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Subject: [Bug libstdc++/85466] Performance is slow when doing 'branchless' conditional style math operations
Date: Thu, 19 Apr 2018 14:19:00 -0000
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--- Comment #13 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 19 Apr 2018, glisse at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85466
>
> --- Comment #12 from Marc Glisse <glisse at gcc dot gnu.org> ---
> Constant folding for nextafter seems like a useful thing to add, whatever we
> say about the rest of the testcase.
Indeed - looks like this and related functions are not constant folded for
whatever reason...
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Subject: [Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE
Date: Thu, 19 Apr 2018 14:20:00 -0000
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--- Comment #46 from David Edelsohn <dje at gcc dot gnu.org> ---
I understand the issues with Golang and have been raising the issue internally.
>From gcc-bugs-return-602140-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:20:01 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 #45 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
(In reply to Jakub Jelinek from comment #42)
> See e.g. https://gcc.gnu.org/onlinedocs/gccint/
> https://gcc.gnu.org/onlinedocs/gccint/#toc-RTL-Representation
> https://gcc.gnu.org/onlinedocs/gccint/Machine-Desc.html#Machine-Desc
> https://kristerw.blogspot.cz/2017/08/writing-gcc-backend_4.html
> and many others.
Thank you.
> Don't really know how is writing a new backend relevant to
> maintaining an existing one.
Well, I guess there is no documentation "How to fix an unmaintained target and
bring it back into shape.", is there?
Documenation which explains how to write a backend should also help fixing an
existing one.
>From gcc-bugs-return-602142-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:23:27 2018
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Subject: [Bug rtl-optimization/85455] [8 Regression] ICE in verify_loop_structure, at cfgloop.c:1708 (error: basic block 3 should be marked irreducible)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85455
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-602143-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:25:50 2018
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Subject: [Bug target/85381] [og7, nvptx, openacc] parallel-loop-1.c fails with default vector length 128
Date: Thu, 19 Apr 2018 14:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85381
--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 43992
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43992&action=edit
tentative patch
(In reply to Tom de Vries from comment #4)
> This looks like a JIT bug, but with this tentative patch:
> ...
> diff --git a/gcc/config/nvptx/nvptx.c b/gcc/config/nvptx/nvptx.c
> index 8c478c874bd..ac394ee1ae6 100644
> --- a/gcc/config/nvptx/nvptx.c
> +++ b/gcc/config/nvptx/nvptx.c
> @@ -4479,7 +4479,7 @@ nvptx_process_pars (parallel *par)
> threads = nvptx_mach_vector_length ();
> }
>
> - if (!empty || !is_call)
> + if (!(empty || is_call))
> {
> /* Insert begin and end synchronizations. */
> emit_insn_before (nvptx_cta_sync (barrier, threads),
> ...
> no barriers are generated, and the minimized testcase passes.
Actually, this was a bit more complicated than that.
The condition correctly identifies the situation of a call and no state
propagation as not needing barriers.
But in the case of not a call (so, fork/join), even if there's no state
propagation, we need synchronization at the end of worker and vector loops.
[ More precisely, we need it inbetween loops, but we're currently not detecting
that situation.
And even more precisely, we need it inbetween dependent loops, but we also
currently not detecting that situation. ]
This patch skips the first of the bar.syncs, keeping the one after the loop,
and that allows parallel-loop-1.c to pass with vector length 128.
>From gcc-bugs-return-602144-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:30:29 2018
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Subject: [Bug fortran/85448] the compiler selects the wrong subroutine because of bind(c,name=...)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85448
--- Comment #4 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Thu, Apr 19, 2018 at 09:07:15AM +0000, francois.jacq at irsn dot fr wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85448
>
> --- Comment #3 from francois.jacq at irsn dot fr ---
> Notice that this is a regression : The version 4.8.5 returns the result I
> expected...
>
Or it was a bug in 4.8.5 and is now fixed.
Now, the version where you rename odopen from m1
to odopen_m1 is probably a bug.
>From gcc-bugs-return-602145-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:31:26 2018
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From: "wschmidt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85198] long long int vector mistaken as long int vector
Date: Thu, 19 Apr 2018 14:31:00 -0000
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--- Comment #4 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Ah, but vulli does have the wrong element type, when you get a little deeper.
<identifier_node 0x3fffb5d96db0 vulli
symbol <var_decl 0x3fffb7f71320 vulli
type <vector_type 0x3fffb5bc5e80 __vector long long type <integer_type
0x3fffb5b10888 long int>
V2DI
size <integer_cst 0x3fffb5ae1050 constant 128>
unit-size <integer_cst 0x3fffb5ae1068 constant 16>
align:128 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x3fffb5bc5dd8 nunits:2>
public static common V2DI defer-output pr85198-2.c:3:22 size
<integer_cst 0x3fffb5ae1050 128> unit-size <integer_cst 0x3fffb5ae1068 16>
align:128 warn_if_not_align:0>>
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Subject: [Bug target/85381] [og7, nvptx, openacc] parallel-loop-1.c fails with default vector length 128
Date: Thu, 19 Apr 2018 14:32:00 -0000
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--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
For this example:
...
#define n 1024
int
main (void)
{
#pragma acc parallel vector_length(128)
{
#pragma acc loop vector
for (int i = 0; i < n; i++)
;
#pragma acc loop vector
for (int i = 0; i < n; i++)
;
}
return 0;
}
...
we currently generate:
...
.entry main$_omp_fn$0
{
.reg.u64 %r24;
.reg.u64 %r25;
.reg.u64 %r26;
.reg.u64 %r27;
.reg.pred %r28;
{
.reg.u32 %x;
mov.u32 %x, %tid.x;
setp.ne.u32 %r28, %x, 0;
}
bar.sync 0;
@%r28 bra $L2;
// join 4;
// fork 4;
$L2:
bar.sync 0;
ret;
}
...
so if we fix the branch around nothing problem here, we'll get back-to-back
bar.syncs again, and may run into the JIT but again.
We may wanna insert dummy ops inbetween (it would be nice if something less
heavy than a membar.cta will work).
>From gcc-bugs-return-602147-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:46:24 2018
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From: "francois.jacq at irsn dot fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85448] the compiler selects the wrong subroutine because of bind(c,name=...)
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--- Comment #5 from francois.jacq at irsn dot fr ---
On Thursday 19 April 2018 16:30:09 you wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85448
>
> --- Comment #4 from Steve Kargl <sgk at troutmask dot apl.washington.edu>
> ---
>
> On Thu, Apr 19, 2018 at 09:07:15AM +0000, francois.jacq at irsn dot fr
wrote:
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85448
> >
> > --- Comment #3 from francois.jacq at irsn dot fr ---
> > Notice that this is a regression : The version 4.8.5 returns the result I
> > expected...
>
> Or it was a bug in 4.8.5 and is now fixed.
>
> Now, the version where you rename odopen from m1
> to odopen_m1 is probably a bug.
No : both are bugs (and probably identical). The bind clause cannot change how
the procedure name "odopen" has to be considered from the Fortran side !
Intel, Oracle and Nag compilers agree with me.
>From gcc-bugs-return-602148-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 14:50:30 2018
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Subject: [Bug fortran/85448] the compiler selects the wrong subroutine because of bind(c,name=...)
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|RESOLVED |REOPENED
Last reconfirmed| |2018-04-19
CC|kargl at gcc dot gnu.org |
Resolution|INVALID |---
Ever confirmed|0 |1
--- Comment #6 from kargl at gcc dot gnu.org ---
Re-open.
Remove my email address.
Let someone else deal with the problem.
>From gcc-bugs-return-602149-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 15:08:11 2018
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From: "jameskuyper at verizon dot net" <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 #31 from James Kuyper Jr. <jameskuyper at verizon dot net> ---
(In reply to rguenther@suse.de from comment #29)
> On Thu, 19 Apr 2018, jameskuyper at verizon dot net wrote:
...
> > The relevant wording is "anywhere that a declaration of the completed type of
> > the union is visible.", so it's unambiguously the type, not the object, which
> > must be visible. A declaration of the completed type can be visible without any
> > objects of that type being visible, and that's sufficient for this rule to
> > apply.
> >
> > > ... Must the access be performed
> > > using the union object, or just the union type, or neither?
> >
> > It says only that "it is permitted to inspect the common initial part"; it
> > imposes no restrictions on how the inspection may be performed. Clearly,
> > inspection through an lvalue of the union's type must be permitted, but it is
> > also permitted to use the more indirect methods which are the subject of this
> > bug report, simply because the standard says nothing to restrict the permission
> > it grants to the more direct cases.
>
> Note I repeatedly said this part of the standard is just stupid.
As a judgement call, I reserve the right to disagree with you on that point,
particularly if that judgement was based primarily on the following
misconception:
> ... It makes
> most if not all type-based alias analysis useless.
How could that be true? It only applies to pairs of struct types that are the
types of members of the same union, it only applies within the scope of a
completed definition of that union's type, and it doesn't apply if the
implementation can prove to itself that the two objects in question are not
actually members of the same union object. It seems to me that the need to take
this rule into consideration would come up pretty infrequently.
Code which relies upon this feature to implement a C-style approximation to
inheritance has been fairly common, which is precisely why the C committee
decided to create this rule, to make sure such code had well-defined behavior.
> Which means I'll refuse any patches implementing it in a way that affects
> default behavior. A clean patch (I really can't think of any clean
> approach besides forcing -fno-strict-aliasing!) with some extra flag
> (well, just use -fno-strict-aliasing ...) would be fine with me.
I can understanding not making this the default behavior if you feel that way;
I only use gcc in fully standard-conforming mode, anyway, so that doesn't
matter to me. However, personally, I would prefer it if gcc's fully-conforming
mode took full advantage of all the optimization opportunities legitimately
enabled by 6.5p7 (which does not include opportunities revoked by 6.5.2.3p6).
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From: "segher at gcc dot gnu.org" <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
Date: Thu, 19 Apr 2018 15:14:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81084
--- Comment #47 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Eric Botcazou from comment #35)
> > A port does not need maintenance only for that port, and its users, but also
> > for GCC itself. All ports are a cost to _all_ GCC developers. If a port is
> > not maintained it has to be removed.
>
> Do you IBM guys have a hidden agenda to bury the left-overs of Freescale? ;-)
>
> The SPE port has already been moved out of the way so I don't really see the
> point in further hammering it like that; there are plenty of obsolete ports
> in the tree that would have to removed before this one if the above
> criterion was followed to the letter.
This is not about IBM.
Believe it or not, but the rs6000 port maintainers *care* about older systems.
I wanted to obsolete SPE support because it is a big burden, not in small part
because no one maintains it. This has been going on for years and years.
Big pushback; people still want SPE, they just don't want to spend work on it.
Well neither do we, it's been enough. So I spent a week splitting off the port
(also tested removing VSX etc.; removing unused code does not take that long;
I just have no way to *test* it so that was not included). It was agreed the
powerpcspe port would be maintained or it would be removed.
Now a year later GCC 8 is on the horizon, and the powerpcspe port is still not
maintained. And the RMs decided to give it *another* year: it is not removed
but merely obsoleted.
>From gcc-bugs-return-602151-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 15:16:07 2018
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From: "hjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85417] -fcf-protection should provide CET protection on x86
Date: Thu, 19 Apr 2018 15:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85417
--- Comment #6 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Thu Apr 19 15:15:04 2018
New Revision: 259496
URL: https://gcc.gnu.org/viewcvs?rev=259496&root=gcc&view=rev
Log:
x86: Enable -fcf-protection with multi-byte NOPs
-fcf-protection -mcet can't be used with IFUNC features, like symbol
multiversioning or target clone, since IBT/SHSTK are applied to the whole
program and they may be disabled in some functions. But -fcf-protection
is implemented with multi-byte NOPs on all 64-bit processors as well as
32-bit processors starting with Pentium Pro. If -fcf-protection requires
-mcet, IFUNC features can't be used on Linux when -fcf-protection is
enabled by default.
This patch changes -fcf-protection to implement indirect branch and
return address tracking with multi-byte NOPs. -mibt and -mshstk are
changed to only enable CET built-in functions. CET tests are updated
to allow -fcf-protection without -mibt, -mshstk and -mcet on x86.
-fcf-protection=none are also added to tests which fail with
-fcf-protection so that -fcf-protection can be added to RUNTESTFLAGS
to verify -fcf-protection implementation.
gcc/
PR target/85417
* config/i386/cet.c (file_end_indicate_exec_stack_and_cet):
Check flag_cf_protection instead of TARGET_IBT and TARGET_SHSTK.
* config/i386/i386-c.c (ix86_target_macros_internal): Also
define __IBT__ and __SHSTK__ for -fcf-protection.
* config/i386/i386.c (pass_insert_endbranch::gate): Don't check
TARGET_IBT.
(ix86_trampoline_init): Likewise.
(x86_output_mi_thunk): Likewise.
(ix86_notrack_prefixed_insn_p): Likewise.
(ix86_option_override_internal): Don't disallow -fcf-protection.
* config/i386/i386.md (rdssp<mode>): Also enable for
-fcf-protection.
(incssp<mode>): Likewise.
(nop_endbr): Likewise.
* config/i386/i386.opt (mcet): Change help message to built-in
functions only.
(mibt): Likewise.
(mshstk): Likewise.
* doc/invoke.texi: Remove -mcet, -mibt and -mshstk condition
on -fcf-protection. Change -mcet, -mibt and -mshstk to only
enable CET built-in functions.
gcc/testsuite/
PR target/85417
* c-c++-common/attr-nocf-check-1.c: Compile with
-fcf-protection=none.
* c-c++-common/attr-nocf-check-3.c: Likewise.
* gcc.dg/march-generic.c: Likewise.
* gcc.target/i386/align-limit.c: Likewise.
* gcc.target/i386/cet-notrack-icf-1.c: Likewise.
* gcc.target/i386/cet-notrack-icf-3.c: Likewise.
* gcc.target/i386/cet-property-2.c: Likewise.
* gcc.target/i386/ret-thunk-26.c: Likewise.
* c-c++-common/fcf-protection-1.c: Remove dg-error for x86
targets.
* c-c++-common/fcf-protection-2.c: Likewise.
* c-c++-common/fcf-protection-3.c: Likewise.
* c-c++-common/fcf-protection-5.c: Likewise.
* c-c++-common/fcf-protection-6.c: Likewise.
* c-c++-common/fcf-protection-7.c: Likewise.
* gcc.target/i386/cet-label-3.c: New test.
* gcc.target/i386/cet-property-3.c: Likewise.
* gcc.target/i386/cet-sjlj-7.c: Likewise.
* gcc.target/i386/pr85417-1.c: Likewise.
* gcc.target/i386/indirect-thunk-attr-7.c: Also expect
__x86_indirect_thunk_nt_(r|e)ax
* gcc.target/i386/indirect-thunk-extern-7.c: Likewise.
* gcc.target/i386/pr85403.c: Remove dg-error,
Added:
trunk/gcc/testsuite/gcc.target/i386/cet-label-3.c
trunk/gcc/testsuite/gcc.target/i386/cet-property-3.c
trunk/gcc/testsuite/gcc.target/i386/cet-sjlj-7.c
trunk/gcc/testsuite/gcc.target/i386/pr85417-1.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/cet.c
trunk/gcc/config/i386/i386-c.c
trunk/gcc/config/i386/i386.c
trunk/gcc/config/i386/i386.md
trunk/gcc/config/i386/i386.opt
trunk/gcc/doc/invoke.texi
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/c-c++-common/attr-nocf-check-1.c
trunk/gcc/testsuite/c-c++-common/attr-nocf-check-3.c
trunk/gcc/testsuite/c-c++-common/fcf-protection-1.c
trunk/gcc/testsuite/c-c++-common/fcf-protection-2.c
trunk/gcc/testsuite/c-c++-common/fcf-protection-3.c
trunk/gcc/testsuite/c-c++-common/fcf-protection-5.c
trunk/gcc/testsuite/c-c++-common/fcf-protection-6.c
trunk/gcc/testsuite/c-c++-common/fcf-protection-7.c
trunk/gcc/testsuite/gcc.dg/march-generic.c
trunk/gcc/testsuite/gcc.target/i386/align-limit.c
trunk/gcc/testsuite/gcc.target/i386/cet-notrack-icf-1.c
trunk/gcc/testsuite/gcc.target/i386/cet-notrack-icf-3.c
trunk/gcc/testsuite/gcc.target/i386/cet-property-2.c
trunk/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-7.c
trunk/gcc/testsuite/gcc.target/i386/indirect-thunk-extern-7.c
trunk/gcc/testsuite/gcc.target/i386/pr85403.c
trunk/gcc/testsuite/gcc.target/i386/ret-thunk-26.c
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Subject: [Bug target/85469] New: -mibt is unused
Date: Thu, 19 Apr 2018 15:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85469
Bug ID: 85469
Summary: -mibt is unused
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: igor.v.tsimbalist at intel dot com
Blocks: 81652
Target Milestone: ---
Target: x86_64-*-*, i?86-*-*
With r259496, now -mibt does nothing and should be removed.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
[Bug 81652] [meta-bug] -fcf-protection=full -mcet bugs
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Subject: [Bug libgcc/85379] Missing ENDBR in __stack_split_initialize
Date: Thu, 19 Apr 2018 15:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85379
--- Comment #1 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Thu Apr 19 15:22:27 2018
New Revision: 259497
URL: https://gcc.gnu.org/viewcvs?rev=259497&root=gcc&view=rev
Log:
libgcc/CET: Add _CET_ENDBR to __stack_split_initialize
Program received signal SIGSEGV, Segmentation fault.
__stack_split_initialize ()
at /export/gnu/import/git/sources/gcc/libgcc/config/i386/morestack.S:751
751 leaq -16000(%rsp),%rax # We should have at least 16K.
Missing separate debuginfos, use: dnf debuginfo-install
libgcc-8.0.1-0.21.0.fc28.x86_64
(gdb) disass
Dump of assembler code for function __stack_split_initialize:
=> 0x0000000000402858 <+0>: lea -0x3e80(%rsp),%rax
0x0000000000402860 <+8>: mov %rax,%fs:0x70
0x0000000000402869 <+17>: sub $0x8,%rsp
0x000000000040286d <+21>: mov %rsp,%rdi
0x0000000000402870 <+24>: mov $0x3e80,%esi
0x0000000000402875 <+29>: callq 0x401810
<__generic_morestack_set_initial_sp>
0x000000000040287a <+34>: add $0x8,%rsp
0x000000000040287e <+38>: retq
End of assembler dump.
(gdb)
This patch adds the missing ENDBR to __stack_split_initialize.
PR libgcc/85379
* config/i386/morestack.S (__stack_split_initialize): Add
_CET_ENDBR.
Modified:
trunk/libgcc/ChangeLog
trunk/libgcc/config/i386/morestack.S
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Subject: [Bug target/85404] -fcf-protection -mcet doesn't work with -fleading-underscore
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--- Comment #2 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Thu Apr 19 15:24:53 2018
New Revision: 259498
URL: https://gcc.gnu.org/viewcvs?rev=259498&root=gcc&view=rev
Log:
x86/cet: Properly output labels in property note section
Replace ASM_OUTPUT_LABEL with fprintf so that internal labels in property
note section are unchanged by -fleading-underscore.
gcc/
PR target/85404
* config/i386/cet.c (file_end_indicate_exec_stack_and_cet):
Replace ASM_OUTPUT_LABEL with fprintf.
gcc/testsuite/
PR target/85404
* gcc.target/i386/pr85404.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr85404.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/cet.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug libgcc/85379] Missing ENDBR in __stack_split_initialize
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |8.0
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 8.
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Subject: [Bug target/81652] [meta-bug] -fcf-protection=full -mcet bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
Bug 81652 depends on bug 85379, which changed state.
Bug 85379 Summary: Missing ENDBR in __stack_split_initialize
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85379
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
Bug 81652 depends on bug 85404, which changed state.
Bug 85404 Summary: -fcf-protection -mcet doesn't work with -fleading-underscore
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85404
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----------------------------------------------------------------------------
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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> ---
Fixed for GCC 8.
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Subject: [Bug target/81652] [meta-bug] -fcf-protection=full -mcet bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
Bug 81652 depends on bug 85417, which changed state.
Bug 85417 Summary: -fcf-protection should provide CET protection on x86
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85417
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H.J. Lu <hjl.tools at gmail dot com> changed:
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--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 8.
>From gcc-bugs-return-602163-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 15:29:43 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/65775] Late-specified return type bypasses return type checks (qualified, function, array)
Date: Thu, 19 Apr 2018 15:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65775
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu Apr 19 15:29:03 2018
New Revision: 259499
URL: https://gcc.gnu.org/viewcvs?rev=259499&root=gcc&view=rev
Log:
PR c++/85464 - missing location for -Wignored-qualifiers diagnostic
The fix for PR c++/69733 caused a regression for conversion operators
with redundant cv-qualifiers, changing an incorrect location to an
unknown location. This restores it to the incorrect location (as was
already done on trunk by the fix for PR c++/65775).
gcc/cp:
PR c++/85464 - missing location for -Wignored-qualifiers diagnostic
* decl.c (grokdeclarator): If declspecs->locations[ds_type_spec]
is UNKNOWN_LOCATION fall back to input_location.
gcc/testsuite:
PR c++/85464 - missing location for -Wignored-qualifiers diagnostic
* g++.dg/diagnostic/pr85464.C: New.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/diagnostic/pr85464.C
Modified:
branches/gcc-7-branch/gcc/cp/ChangeLog
branches/gcc-7-branch/gcc/cp/decl.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug c++/69733] -Wignored-qualifiers points to wrong const
Date: Thu, 19 Apr 2018 15:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69733
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu Apr 19 15:29:03 2018
New Revision: 259499
URL: https://gcc.gnu.org/viewcvs?rev=259499&root=gcc&view=rev
Log:
PR c++/85464 - missing location for -Wignored-qualifiers diagnostic
The fix for PR c++/69733 caused a regression for conversion operators
with redundant cv-qualifiers, changing an incorrect location to an
unknown location. This restores it to the incorrect location (as was
already done on trunk by the fix for PR c++/65775).
gcc/cp:
PR c++/85464 - missing location for -Wignored-qualifiers diagnostic
* decl.c (grokdeclarator): If declspecs->locations[ds_type_spec]
is UNKNOWN_LOCATION fall back to input_location.
gcc/testsuite:
PR c++/85464 - missing location for -Wignored-qualifiers diagnostic
* g++.dg/diagnostic/pr85464.C: New.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/diagnostic/pr85464.C
Modified:
branches/gcc-7-branch/gcc/cp/ChangeLog
branches/gcc-7-branch/gcc/cp/decl.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85464] [7 Regression] Wignored-qualifiers is emitted by cc1plus without diagnostics when triggered by a cast operator.
Date: Thu, 19 Apr 2018 15:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85464
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu Apr 19 15:29:03 2018
New Revision: 259499
URL: https://gcc.gnu.org/viewcvs?rev=259499&root=gcc&view=rev
Log:
PR c++/85464 - missing location for -Wignored-qualifiers diagnostic
The fix for PR c++/69733 caused a regression for conversion operators
with redundant cv-qualifiers, changing an incorrect location to an
unknown location. This restores it to the incorrect location (as was
already done on trunk by the fix for PR c++/65775).
gcc/cp:
PR c++/85464 - missing location for -Wignored-qualifiers diagnostic
* decl.c (grokdeclarator): If declspecs->locations[ds_type_spec]
is UNKNOWN_LOCATION fall back to input_location.
gcc/testsuite:
PR c++/85464 - missing location for -Wignored-qualifiers diagnostic
* g++.dg/diagnostic/pr85464.C: New.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/diagnostic/pr85464.C
Modified:
branches/gcc-7-branch/gcc/cp/ChangeLog
branches/gcc-7-branch/gcc/cp/decl.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
>From gcc-bugs-return-602164-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 15:31:43 2018
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Subject: [Bug target/85381] [og7, nvptx, openacc] parallel-loop-1.c fails with default vector length 128
Date: Thu, 19 Apr 2018 15:31:00 -0000
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--- Comment #8 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #6)
> Created attachment 43992 [details]
> tentative patch
Tested libgomp on og7 build with quadro m1200, no issues found.
>From gcc-bugs-return-602165-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 15:39:07 2018
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Subject: [Bug c++/85470] New: Strange error about "call to non-constexpr function"
Date: Thu, 19 Apr 2018 15:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85470
Bug ID: 85470
Summary: Strange error about "call to non-constexpr function"
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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GCC 7 fails to compile the following code:
---- test.cpp ----
template <class T>
struct StaticObject
{
static T& create()
{
static T t;
return t;
}
static T & instance;
};
template <class T> T & StaticObject<T>::instance = StaticObject<T>::create();
extern template class StaticObject<int>;
void test()
{
StaticObject<int>::instance;
}
---- command line -----
$ g++-7.3.0 -v
Using built-in specs.
COLLECT_GCC=g++-7.3.0
COLLECT_LTO_WRAPPER=/home/brd/soft/gcc-7.3.0/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ./configure --prefix=/home/brd/soft/gcc-7.3.0
Thread model: posix
gcc version 7.3.0 (GCC)
$ g++-7.3.0 -c test.cpp
test.cpp: In instantiation of ‘int& StaticObject<int>::instance’:
test.cpp:19:24: required from here
test.cpp:13:75: error: call to non-constexpr function ‘static T&
StaticObject<T>::create() [with T = int]’
template <class T> T & StaticObject<T>::instance = StaticObject<T>::create();
P.S. I also tried 7.1 (same error) and 6.3 (no error)
>From gcc-bugs-return-602166-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 15:53:58 2018
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Subject: [Bug middle-end/85450] ICE: invalid types in nop conversion during GIMPLE pass: ompexp
Date: Thu, 19 Apr 2018 15:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85450
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
There are 4 spots, unsigned_type_for breaks for-5.c though.
There are several other spots that do use signed_type_for instead, so following
works for the testsuite:
--- gcc/omp-expand.c.jj 2018-04-16 20:35:14.663558320 +0200
+++ gcc/omp-expand.c 2018-04-19 17:14:13.267424165 +0200
@@ -3501,7 +3501,12 @@ expand_omp_for_static_nochunk (struct om
t = fold_convert (itype, s0);
t = fold_build2 (MULT_EXPR, itype, t, step);
if (POINTER_TYPE_P (type))
- t = fold_build_pointer_plus (n1, t);
+ {
+ t = fold_build_pointer_plus (n1, t);
+ if (!POINTER_TYPE_P (TREE_TYPE (startvar))
+ && TYPE_PRECISION (TREE_TYPE (startvar)) > TYPE_PRECISION (type))
+ t = fold_convert (signed_type_for (type), t);
+ }
else
t = fold_build2 (PLUS_EXPR, type, t, n1);
t = fold_convert (TREE_TYPE (startvar), t);
@@ -3515,7 +3520,12 @@ expand_omp_for_static_nochunk (struct om
t = fold_convert (itype, e0);
t = fold_build2 (MULT_EXPR, itype, t, step);
if (POINTER_TYPE_P (type))
- t = fold_build_pointer_plus (n1, t);
+ {
+ t = fold_build_pointer_plus (n1, t);
+ if (!POINTER_TYPE_P (TREE_TYPE (startvar))
+ && TYPE_PRECISION (TREE_TYPE (startvar)) > TYPE_PRECISION (type))
+ t = fold_convert (signed_type_for (type), t);
+ }
else
t = fold_build2 (PLUS_EXPR, type, t, n1);
t = fold_convert (TREE_TYPE (startvar), t);
@@ -4000,7 +4010,12 @@ expand_omp_for_static_chunk (struct omp_
t = fold_convert (itype, s0);
t = fold_build2 (MULT_EXPR, itype, t, step);
if (POINTER_TYPE_P (type))
- t = fold_build_pointer_plus (n1, t);
+ {
+ t = fold_build_pointer_plus (n1, t);
+ if (!POINTER_TYPE_P (TREE_TYPE (startvar))
+ && TYPE_PRECISION (TREE_TYPE (startvar)) > TYPE_PRECISION (type))
+ t = fold_convert (signed_type_for (type), t);
+ }
else
t = fold_build2 (PLUS_EXPR, type, t, n1);
t = fold_convert (TREE_TYPE (startvar), t);
@@ -4014,7 +4029,12 @@ expand_omp_for_static_chunk (struct omp_
t = fold_convert (itype, e0);
t = fold_build2 (MULT_EXPR, itype, t, step);
if (POINTER_TYPE_P (type))
- t = fold_build_pointer_plus (n1, t);
+ {
+ t = fold_build_pointer_plus (n1, t);
+ if (!POINTER_TYPE_P (TREE_TYPE (startvar))
+ && TYPE_PRECISION (TREE_TYPE (startvar)) > TYPE_PRECISION (type))
+ t = fold_convert (signed_type_for (type), t);
+ }
else
t = fold_build2 (PLUS_EXPR, type, t, n1);
t = fold_convert (TREE_TYPE (startvar), t);
Though, I think it would be better to replace most of the signed_type_for
related to pointer types to unsigned_type_for. Not something I have time for
right now though.
>From gcc-bugs-return-602167-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 16:16:46 2018
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Subject: [Bug c++/85470] [7/8 Regression] Strange error about "call to non-constexpr function"
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
CC| |jakub at gcc dot gnu.org
Target Milestone|--- |7.4
Summary|Strange error about "call |[7/8 Regression] Strange
|to non-constexpr function" |error about "call to
| |non-constexpr function"
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This is rejected starting with r242422.
>From gcc-bugs-return-602168-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 16:33:18 2018
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Subject: [Bug libstdc++/61424] std::regex matches right to left, not leftmost longest
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |5.0
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think this was fixed for gcc 5.1
>From gcc-bugs-return-602169-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 16:37:13 2018
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Subject: [Bug target/85397] -mcet -fcf-protection doesn't work with label in nested function
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--- Comment #5 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Thu Apr 19 16:36:34 2018
New Revision: 259500
URL: https://gcc.gnu.org/viewcvs?rev=259500&root=gcc&view=rev
Log:
i386: Add save_stack_nonlocal and restore_stack_nonlocal
Define STACK_SAVEAREA_MODE to hold both shadow stack and stack pointers.
Replace builtin_setjmp_setup and builtin_longjmp with save_stack_nonlocal
and restore_stack_nonlocal to support both builtin setjmp/longjmp as well
as non-local goto in nested functions.
gcc/
PR target/85397
* config/i386/i386.h (STACK_SAVEAREA_MODE): New.
* config/i386/i386.md (builtin_setjmp_setup): Removed.
(builtin_longjmp): Likewise.
(save_stack_nonlocal): New pattern.
(restore_stack_nonlocal): Likewise.
gcc/testsuite/
PR target/85397
* gcc.dg/torture/pr85397-1.c: New test.
* gcc.target/i386/cet-sjlj-6a.c: Adjusted.
* gcc.target/i386/cet-sjlj-6b.c: Likewise.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr85397-1.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.h
trunk/gcc/config/i386/i386.md
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/i386/cet-sjlj-6a.c
trunk/gcc/testsuite/gcc.target/i386/cet-sjlj-6b.c
>From gcc-bugs-return-602170-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 16:37:23 2018
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Subject: [Bug libstdc++/68450] regex matching different from ECMAScript?
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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|--- |4.9.4
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This seems to be fixed in GCC 4.9.4, 5.4, 6.1, and any later releases.
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Subject: [Bug target/81652] [meta-bug] -fcf-protection=full -mcet bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
Bug 81652 depends on bug 85397, which changed state.
Bug 85397 Summary: -mcet -fcf-protection doesn't work with label in nested function
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85397
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-602171-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 16:38:28 2018
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85397] -mcet -fcf-protection doesn't work with label in nested function
Date: Thu, 19 Apr 2018 16:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85397
H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 8.
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From: "wschmidt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85198] long long int vector mistaken as long int vector
Date: Thu, 19 Apr 2018 16:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85198
--- Comment #5 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
OK, I see Jakub's point now. And this whole business is a big mess -- probably
too late to change in 8, but we need to clean this up.
>From gcc-bugs-return-602174-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 16:44:39 2018
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From: "aotto1968@t-online.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85471] New: closing a "thread" in "C++" using "pthread_exit(NULL)" creates a "SIGABRT"
Date: Thu, 19 Apr 2018 16:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85471
Bug ID: 85471
Summary: closing a "thread" in "C++" using "pthread_exit(NULL)"
creates a "SIGABRT"
Product: gcc
Version: 7.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: aotto1968@t-online.de
Target Milestone: ---
Host: openSUSE 42.3 (x86_64)
Target: openSUSE 42.3 (x86_64)
Build: openSUSE 42.3 (x86_64)
the c++ compiler I use:
g++-7 (SUSE Linux) 7.3.1 20180307 [gcc-7-branch revision 258314]
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.
Problem
=======
In one of my TEST-Cases… written for my own server-software… I close a
(worker)-thread using the following code…
> pthread_exit(NULL);
in "C" this works fine… in "c++" I get the error from below… covered with
"valgrind"…
question: why I get this error in "system" code ????
==55315==
==55315== Process terminating with default action of signal 6 (SIGABRT)
==55315== at 0x58E7F67: raise (raise.c:55)
==55315== by 0x58E9339: abort (abort.c:78)
==55315== by 0x413FED: _Unwind_SetGR (unwind-dw2.c:273)
==55315== by 0x40763C: __gxx_personality_v0 (eh_personality.cc:712)
==55315== by 0x5FF04A4: _Unwind_ForcedUnwind_Phase2 (unwind.inc:175)
==55315== by 0x5FF0A64: _Unwind_ForcedUnwind (unwind.inc:207)
==55315== by 0x56A598F: __pthread_unwind (unwind.c:126)
==55315== by 0x569F8B4: __do_cancel (pthreadP.h:283)
==55315== by 0x569F8B4: pthread_exit (pthread_exit.c:28)
==55315== by 0x4E6AB00: libmsgque::SysExit(int, int) (sys.cc:935)
==55315== by 0x4E64E8C: libmsgque::MqSysExit(int, int) (msgque.h:5671)
==55315== by 0x4E65B05: libmsgque::MqExitP(libmsgque::MqS*, char const*,
char const*) (msgque.cc:417)
==55315== by 0x404917: ccmsgque::MqC::Exit() (ccmsgque.h:409)
==55315==
==55315== HEAP SUMMARY:
==55315== in use at exit: 101,380 bytes in 63 blocks
==55315== total heap usage: 401 allocs, 338 frees, 493,733 bytes allocated
==55315==
==55315== LEAK SUMMARY:
==55315== definitely lost: 0 bytes in 0 blocks
==55315== indirectly lost: 0 bytes in 0 blocks
==55315== possibly lost: 320 bytes in 1 blocks
==55315== still reachable: 101,060 bytes in 62 blocks
==55315== suppressed: 0 bytes in 0 blocks
==55315== Rerun with --leak-check=full to see details of leaked memory
==55315==
==55315== For counts of detected and suppressed errors, rerun with: -v
==55315== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
Abgebrochen (Speicherabzug geschrieben)
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Subject: [Bug c++/85470] [7/8 Regression] Strange error about "call to non-constexpr function"
Date: Thu, 19 Apr 2018 16:49:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
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CC| |jason at gcc dot gnu.org
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
r200450 added
- if (DECL_DECLARED_CONSTEXPR_P (decl))
+ if (DECL_DECLARED_CONSTEXPR_P (decl)
+ || DECL_IN_AGGR_P (decl))
I wonder if it shouldn't have been DECL_INITIALIZED_IN_CLASS_P instead, or
DECL_IN_AGGR_P (decl) && DECL_INITIALIZED_IN_CLASS_P (decl).
If DECL_IN_AGGR_P (decl) check is right here, then the question is why it is
set when there is the extern template line (and not otherwise).
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Subject: [Bug c++/85471] closing a "thread" in "C++" using "pthread_exit(NULL)" creates a "SIGABRT"
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-04-19
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Please provide a test case.
https://gcc.gnu.org/bugs/
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Subject: [Bug c++/85464] [7 Regression] Wignored-qualifiers is emitted by cc1plus without diagnostics when triggered by a cast operator.
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for 7.4
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Subject: [Bug c++/85464] [7 Regression] Wignored-qualifiers is emitted by cc1plus without diagnostics when triggered by a cast operator.
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu Apr 19 17:00:37 2018
New Revision: 259501
URL: https://gcc.gnu.org/viewcvs?rev=259501&root=gcc&view=rev
Log:
PR c++/85464 - missing location for -Wignored-qualifiers diagnostic
* g++.dg/diagnostic/pr85464.C: New.
Added:
trunk/gcc/testsuite/g++.dg/diagnostic/pr85464.C
Modified:
trunk/gcc/testsuite/ChangeLog
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for 7.4
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85464
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu Apr 19 17:00:37 2018
New Revision: 259501
URL: https://gcc.gnu.org/viewcvs?rev=259501&root=gcc&view=rev
Log:
PR c++/85464 - missing location for -Wignored-qualifiers diagnostic
* g++.dg/diagnostic/pr85464.C: New.
Added:
trunk/gcc/testsuite/g++.dg/diagnostic/pr85464.C
Modified:
trunk/gcc/testsuite/ChangeLog
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From: "hjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgcc/85334] Shadow stack isn't unwound properly through signal handler
Date: Thu, 19 Apr 2018 17:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85334
--- Comment #3 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Thu Apr 19 17:05:39 2018
New Revision: 259502
URL: https://gcc.gnu.org/viewcvs?rev=259502&root=gcc&view=rev
Log:
libgcc/CET: Skip signal frames when unwinding shadow stack
When -fcf-protection -mcet is used, I got
FAIL: g++.dg/eh/sighandle.C
(gdb) bt
#0 _Unwind_RaiseException (exc=exc@entry=0x416ed0)
at /export/gnu/import/git/sources/gcc/libgcc/unwind.inc:140
#1 0x00007ffff7d9936b in __cxxabiv1::__cxa_throw (obj=<optimized out>,
tinfo=0x403dd0 <typeinfo for int@@CXXABI_1.3>, dest=0x0)
at /export/gnu/import/git/sources/gcc/libstdc++-v3/libsupc++/eh_throw.cc:90
#2 0x0000000000401255 in sighandler (signo=11, si=0x7fffffffd6f8,
uc=0x7fffffffd5c0)
at /export/gnu/import/git/sources/gcc/gcc/testsuite/g++.dg/eh/sighandle.C:9
#3 <signal handler called> <<<< Signal frame which isn't on shadow stack
#4 dosegv ()
at
/export/gnu/import/git/sources/gcc/gcc/testsuite/g++.dg/eh/sighandle.C:14
#5 0x00000000004012e3 in main ()
at
/export/gnu/import/git/sources/gcc/gcc/testsuite/g++.dg/eh/sighandle.C:30
(gdb) p frames
$6 = 5
(gdb)
frame count should be 4, not 5. This patch skips signal frames when
unwinding shadow stack.
gcc/testsuite/
PR libgcc/85334
* g++.dg/torture/pr85334.C: New test.
libgcc/
PR libgcc/85334
* unwind-generic.h (_Unwind_Frames_Increment): New.
* config/i386/shadow-stack-unwind.h (_Unwind_Frames_Increment):
Likewise.
* unwind.inc (_Unwind_RaiseException_Phase2): Increment frame
count with _Unwind_Frames_Increment.
(_Unwind_ForcedUnwind_Phase2): Likewise.
Added:
trunk/gcc/testsuite/g++.dg/torture/pr85334.C
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/libgcc/ChangeLog
trunk/libgcc/config/i386/shadow-stack-unwind.h
trunk/libgcc/unwind-generic.h
trunk/libgcc/unwind.inc
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Subject: [Bug libgcc/85334] Shadow stack isn't unwound properly through signal handler
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H.J. Lu <hjl.tools at gmail dot com> changed:
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--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 8.
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Subject: [Bug middle-end/77696] Confusing wording for -Wformat-overflow
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
David, any thoughts/suggestions for how to improve things (taking into
consideration comment #1)?
>From gcc-bugs-return-602182-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 17:10:13 2018
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Subject: [Bug target/81652] [meta-bug] -fcf-protection=full -mcet bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
Bug 81652 depends on bug 85334, which changed state.
Bug 85334 Summary: Shadow stack isn't unwound properly through signal handler
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85334
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Subject: [Bug other/50639] -flto=jobserver broken on large LTO build
Date: Thu, 19 Apr 2018 17:23:00 -0000
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--- Comment #4 from Andi Kleen <andi-gcc at firstfloor dot org> ---
I doubt it's fixed. It's a race so can be unstable.
Especially since judging from the growing cc list other people keep seeing it
It may not be something that gcc can fix, if anything it's more likely in make
or in Linux.
>From gcc-bugs-return-602185-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 17:37:08 2018
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85470] [7/8 Regression] Strange error about "call to non-constexpr function"
Date: Thu, 19 Apr 2018 17:37:00 -0000
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/cp/typeck2.c.jj 2018-04-19 15:57:36.765482568 +0200
+++ gcc/cp/typeck2.c 2018-04-19 19:32:43.335986274 +0200
@@ -824,7 +824,9 @@ store_init_value (tree decl, tree init,
bool const_init;
value = fold_non_dependent_expr (value);
if (DECL_DECLARED_CONSTEXPR_P (decl)
- || (DECL_IN_AGGR_P (decl) && !DECL_VAR_DECLARED_INLINE_P (decl)))
+ || (DECL_CLASS_SCOPE_P (decl)
+ && DECL_INITIALIZED_IN_CLASS_P (decl)
+ && !DECL_VAR_DECLARED_INLINE_P (decl)))
{
/* Diagnose a non-constant initializer for constexpr. */
if (!require_constant_expression (value))
just changes the error, from
pr85470.C:13:75: error: call to non-‘constexpr’ function ‘static T&
StaticObject<T>::create() [with T = int]’
to
pr85470.C:13:24: error: non-constant in-class initialization invalid for static
member ‘StaticObject<int>::instance’
cpp0x/overflow1.C still PASSes.
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Subject: [Bug c/67882] surprising offsetof result on an invalid array member without diagnostic
Date: Thu, 19 Apr 2018 17:39:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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--- Comment #10 from Martin Sebor <msebor at gcc dot gnu.org> ---
The sentiment within WG14 about the question raised in comment #5 was that the
use case is invalid and the offsetof description makes it sufficiently clear.
In
struct s {
int fpr[32][1];
int fpscr;
};
offsetof(struct s, fpr[32][0])
the offsetof macro is specified to expand such that given
static struct s t;
the following evaluates to an integer constant:
&(t.fpr[32][0])
Since the t.fpr array has only 32 elements, a reference to t.fpr[32][0] is out
of bounds and thus undefined (there is no array fpr[32] and so no element 0 of
such an array). As a result, the full expression does not yield a valid
integer constant as required and a diagnostic is justified. With that I think
it's time to resolve this.
(Other questions were raised about offsetof in DR 496 but even those the
committee doesn't seem to be very interested in dealing with.)
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--- Comment #13 from hyrosen at mail dot com ---
(In reply to Jonathan Wakely from comment #12)
> The C++ standard. Specifically, [basic.life].
>
> So the first memcmp call reuses the storage to create an array of unsigned
> char with indeterminate values. That ends the lifetime of the X (without
> calling the destructor). Then you call the destructor on an object that
> already ended its lifetime, which is undefined. Then you reuse it as an
> array of unsigned char again, and it still has indeterminate values.
No, this is wrong. [basic.life] says (I'm using N4741):
"The lifetime of an object of type T begins when:
— storage with the proper alignment and size for type T is obtained..."
A call to memcmp does not "obtain storage" and therefore cannot begin the
lifetime of an object.
More to the point, this is obviously wrong because the standard permits
copying out the bytes of an object (it gives examples using memcpy in
[basic.types]), and by your thesis, doing so would end the lifetime of the
copied object.
> the value representation of the X cannot be inspected
> by memcmp, because X is not trivially copyable, and since the values are
> indeterminate there is no requirement for the values written by the
> destructor to be observable.
I suppose. The storage itself can be inspected, though, per [basic.life]:
"...after the lifetime of an object has ended and before the storage which
the object occupied is reused or released, any pointer that represents the
address of the storage location... Indirection through such a pointer is
permitted... when the conversion is to ... pointer to cv void and
subsequently to pointer to ... cv unsigned char ...".
Per [intro.execution], modifying an object is a side effect, and to me it
is surprising that a compiler would choose to eliminate the effect of a
side effect on storage when that effect would be observable, although I
don't see the standard saying anything about how modifying objects affects
their storage, so I suppose it may be permitted.
As a matter of personal taste, I am extremely against a compiler eliminating
code that a programmer has written unless the compiler can prove that the
effects cannot be observed. I call this a fetish for optimizationism, a
desire to make isolated code snippets faster by disregarding the intent of
the programmer.
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Subject: [Bug c++/84611] [6/7/8 Regression] ICE in operator[], at vec.h:826 (local_class_index())
Date: Thu, 19 Apr 2018 18:10:00 -0000
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--- Comment #3 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Thu Apr 19 18:09:45 2018
New Revision: 259505
URL: https://gcc.gnu.org/viewcvs?rev=259505&root=gcc&view=rev
Log:
/cp
2018-04-19 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84611
* pt.c (lookup_template_class_1): Check pushtag return value for
error_mark_node.
/testsuite
2018-04-19 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84611
* g++.dg/parse/crash68.C: New.
Added:
trunk/gcc/testsuite/g++.dg/parse/crash68.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/pt.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/84611] [6/7 Regression] ICE in operator[], at vec.h:826 (local_class_index())
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[6/7/8 Regression] ICE in |[6/7 Regression] ICE in
|operator[], at vec.h:826 |operator[], at vec.h:826
|(local_class_index()) |(local_class_index())
--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed in trunk.
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Subject: [Bug c++/61982] Optimizer does not eliminate stores to destroyed objects
Date: Thu, 19 Apr 2018 18:23:00 -0000
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--- Comment #14 from Avi Kivity <avi@cloudius-systems.com> ---
This is a common missed optimization. A container is cleared as part of
destruction, but the stores are not eliminated, even though they are illegal.
If you want to access members of an object, don't destroy it.
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Subject: [Bug c++/61982] Optimizer does not eliminate stores to destroyed objects
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--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The stores aren't illegal, just can't be observed in a valid program, because
after the destruction the bits have indeterminate values.
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Subject: [Bug c++/61982] Optimizer does not eliminate stores to destroyed objects
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--- Comment #16 from Avi Kivity <avi@cloudius-systems.com> ---
Sorry, of course the stores are not illegal.
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Subject: [Bug c++/61982] Optimizer does not eliminate stores to destroyed objects
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--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
And, GCC offers the -fno-lifetime-dse option which will not eliminate the
stores:
-fno-lifetime-dse
In C++ the value of an object is only affected by changes within its lifetime:
when the constructor begins, the object has an indeterminate value, and any
changes during the lifetime of the object are dead when the object is
destroyed. Normally dead store elimination will take advantage of this; if
your code relies on the value of the object storage persisting beyond the
lifetime of the object, you can use this flag to disable this optimization. To
preserve stores before the constructor starts (e.g. because your operator new
clears the object storage) but still treat the object as dead after the
destructor you, can use -flifetime-dse=1. The default behavior can be
explicitly selected with -flifetime-dse=2. -flifetime-dse=0 is equivalent to
-fno-lifetime-dse.
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Subject: [Bug tree-optimization/85467] [8 Regression] ICE: verify_gimple failed: non-trivial conversion at assignment with -O2 -fno-tree-ccp --param=sccvn-max-scc-size\x10
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Apr 19 19:16:18 2018
New Revision: 259507
URL: https://gcc.gnu.org/viewcvs?rev=259507&root=gcc&view=rev
Log:
PR tree-optimization/85467
* fold-const.c (fold_ternary_loc) <case BIT_FIELD_REF>: Use
VECTOR_TYPE_P macro. If type is vector type, VIEW_CONVERT_EXPR the
VECTOR_CST element to type.
* gcc.dg/pr85467.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr85467.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/fold-const.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug tree-optimization/85467] [8 Regression] ICE: verify_gimple failed: non-trivial conversion at assignment with -O2 -fno-tree-ccp --param=sccvn-max-scc-size\x10
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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-602196-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 19:39:40 2018
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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85448] the compiler selects the wrong subroutine because of bind(c,name=...)
Date: Thu, 19 Apr 2018 19:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85448
Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|REOPENED |NEW
CC| |tkoenig at gcc dot gnu.org
Severity|normal |enhancement
--- Comment #7 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
As quoted by Steve Lionel on c.l.f (F2008, 16.2, para 2):
"The global identifier of an entity shall not be the same as the global
identifier of any other entity. Furthermore, a
binding label shall not be the same as the global identifier of any other
global entity, ignoring differences in case."
So, the code is invalid. Since this is not a constraint, the compiler
can do anything it pleases.
It would be nice to have an error message, though; should be straightforward
to implement.
>From gcc-bugs-return-602197-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 19:41:58 2018
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From: "aotto1968@t-online.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85471] closing a "thread" in "C++" using "pthread_exit(NULL)" creates a "SIGABRT"
Date: Thu, 19 Apr 2018 19:41:00 -0000
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--- Comment #2 from Andreas Otto <aotto1968@t-online.de> ---
this is not as easy because this is a non trivial SW… what I mean… to just use
my test-case you have to setup a whole environment… the basic of a SW is a
client/server application using a non trivial protocol…
it is possible you send me a hint to create a better error output for you… for
me it would be perfect if the GCC part of the error could be MORE specific
about the real reason of the SIGABRT
thanks for your work.
>From gcc-bugs-return-602198-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 20:08:37 2018
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/69560] x86_64: alignof(uint64_t) produces incorrect results with -m32
Date: Thu, 19 Apr 2018 20:08:00 -0000
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--- Comment #20 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I consider it part of the ABI that long long
__attribute__((__aligned__(__alignof__(long long)))), as in the definition
of max_align_t (and similarly in gnulib's max_align_t definition, for
example), is 8-byte-aligned on x86.
>From gcc-bugs-return-602199-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 20:11:52 2018
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From: "haberg-1 at telia dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85472] New: Regex match bug
Date: Thu, 19 Apr 2018 20:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85472
Bug ID: 85472
Summary: Regex match bug
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
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Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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Created attachment 43993
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43993&action=edit
The regex example mentioned in the report.
In the regex "(z)((a+)?(b+)?(c))*" example at [1], also attached, applied to
the string "zaacbbbcac", g++ produces a pattern #4 match as "bbb", whereas it
says there it should be empty (the latter which clang++ does).
1. http://en.cppreference.com/w/cpp/regex/ecmascript
>From gcc-bugs-return-602200-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 20:15:13 2018
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Subject: [Bug c/10360] __alignof__(double) answer 8
Date: Thu, 19 Apr 2018 20:15:00 -0000
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--- Comment #12 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Wed, 11 Apr 2018, jason at gcc dot gnu.org wrote:
> The quoted passage in the documentation now reads
>
> ---
> Some machines never actually require alignment; they allow reference to any
> data type even at an odd address. For these machines, @code{__alignof__}
> reports the smallest alignment that GCC gives the data type, usually as
> mandated by the target ABI.
That change (r133271) seems incorrect in this context, as it should be the
alignment given for complete objects.
>From gcc-bugs-return-602201-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 20:26:37 2018
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Subject: [Bug libstdc++/85472] Regex match bug
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Last reconfirmed| |2018-04-19
Component|c++ |libstdc++
Ever confirmed|0 |1
>From gcc-bugs-return-602203-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 20:48:47 2018
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Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Thu, 19 Apr 2018 20:48:00 -0000
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--- Comment #10 from Dennis Clarke <dclarke at blastwave dot org> ---
Well, current gcc 8 snapshot doesn't work :
nix_$
nix_$ /usr/local/gcc8/bin/gcc --version
gcc (genunix Wed Apr 18 19:16:29 GMT 2018) 8.0.1 20180415 (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.
nix_$ /usr/local/gcc8/bin/gcc -m64 -mcpu=970 -o s s.c
s.c:82:10: fatal error: quadmath.h: No such file or directory
#include <quadmath.h>
^~~~~~~~~~~~
compilation terminated.
nix_$
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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85436] [7 Regression] ICE compiling go code with -mcpu=power9
Date: Thu, 19 Apr 2018 20:48:00 -0000
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Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-04-19
Assignee|unassigned at gcc dot gnu.org |bergner at gcc dot gnu.org
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--- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> ---
Confirmed. The failure is similar to that which was fixed in PR83969 and is
fixed by that patch. We didn't think we needed to back port the PR83969 patch,
but I see now we do. I'm testing the back port now.
>From gcc-bugs-return-602204-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 20:54:49 2018
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Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85440
--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
You need powerpc64le, big-endian doesn't support __float128.
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Subject: [Bug c++/85471] closing a "thread" in "C++" using "pthread_exit(NULL)" creates a "SIGABRT"
Date: Thu, 19 Apr 2018 20:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85471
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Have you read https://gcc.gnu.org/bugs/ yet?
(In reply to Andreas Otto from comment #2)
> this is not as easy because this is a non trivial SW… what I mean… to just
> use my test-case you have to setup a whole environment… the basic of a SW is
> a client/server application using a non trivial protocol…
We don't want the whole thing, we want a simple example that demonstrates the
bug you are reporting. Otherwise your report is just hearsay.
For example, here is a simple testcase which works perfectly and doesn't abort:
#include <pthread.h>
#include <thread>
void f()
{
pthread_exit(nullptr);
}
int main()
{
std::thread t(f);
t.join();
}
Here is a testcase which calls std::terminate because the pthread_exit happens
below a noexcept function:
#include <pthread.h>
#include <thread>
void f() noexcept
{
pthread_exit(nullptr);
}
int main()
{
std::thread t(f);
t.join();
}
But this has a different stack trace to your valgrind output:
==25626== Memcheck, a memory error detector
==25626== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==25626== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==25626== Command: ./a.out
==25626==
terminate called without an active exception
==25626==
==25626== Process terminating with default action of signal 6 (SIGABRT):
dumping core
==25626== at 0x59459FB: raise (raise.c:51)
==25626== by 0x59477FF: abort (abort.c:89)
==25626== by 0x4ECC024: __gnu_cxx::__verbose_terminate_handler()
(vterminate.cc:95)
==25626== by 0x4EC9C15: __cxxabiv1::__terminate(void (*)())
(eh_terminate.cc:47)
==25626== by 0x4EC9C60: std::terminate() (eh_terminate.cc:57)
==25626== by 0x4EC97AF: __gxx_personality_v0 (eh_personality.cc:670)
==25626== by 0x54E8FB4: _Unwind_ForcedUnwind_Phase2 (unwind.inc:175)
==25626== by 0x54E9574: _Unwind_ForcedUnwind (unwind.inc:207)
==25626== by 0x5700F0F: __pthread_unwind (unwind.c:121)
==25626== by 0x56F8754: __do_cancel (pthreadP.h:297)
==25626== by 0x56F8754: pthread_exit (pthread_exit.c:28)
==25626== by 0x400A4A: f() (th.cc:6)
==25626== by 0x4EF617E: execute_native_thread_routine (thread.cc:83)
==25626==
==25626== Process terminating with default action of signal 11 (SIGSEGV)
==25626== General Protection Fault
==25626== at 0x5A63E9C: _dl_catch_error (dl-error-skeleton.c:187)
==25626== by 0x5A63616: dlerror_run (dl-libc.c:46)
==25626== by 0x5A63616: __libc_dlclose (dl-libc.c:222)
==25626== by 0x5703C18: nptl_freeres (in /usr/lib64/libpthread-2.25.so)
==25626== by 0x5A8EF11: __libc_freeres (in /usr/lib64/libc-2.25.so)
==25626== by 0x4A286DB: _vgnU_freeres (vg_preloaded.c:77)
==25626==
==25626== HEAP SUMMARY:
==25626== in use at exit: 360 bytes in 3 blocks
==25626== total heap usage: 4 allocs, 1 frees, 73,064 bytes allocated
==25626==
==25626== LEAK SUMMARY:
==25626== definitely lost: 0 bytes in 0 blocks
==25626== indirectly lost: 0 bytes in 0 blocks
==25626== possibly lost: 288 bytes in 1 blocks
==25626== still reachable: 72 bytes in 2 blocks
==25626== suppressed: 0 bytes in 0 blocks
==25626== Rerun with --leak-check=full to see details of leaked memory
==25626==
==25626== For counts of detected and suppressed errors, rerun with: -v
==25626== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
Segmentation fault (core dumped)
So we need a testcase showing the problem.
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Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
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--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Or configure the big endian compiler with VSX by default, e.g.
--with-cpu=power8 or similar.
>From gcc-bugs-return-602207-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 22:26:25 2018
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Subject: [Bug target/85473] New: internal compiler error: in emit_move_insn, at expr.c:3722
Date: Thu, 19 Apr 2018 22:26:00 -0000
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Bug ID: 85473
Summary: internal compiler error: in emit_move_insn, at
expr.c:3722
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: sebastian.peryt at intel dot com
Target Milestone: ---
Target: x86-64
[hjl@gnu-cfl-1 gcc]$ cat /tmp/x.i
extern void
_movdir64b (void * __P, const void * __Q)
{
__builtin_ia32_movdir64b (__P, __Q);
}
[hjl@gnu-cfl-1 gcc]$ ./xgcc -B./ -mx32 -mmovdir64b -mmovdiri -O2 -S /tmp/x.i
during RTL pass: expand
/tmp/x.i: In function ‘_movdir64b’:
/tmp/x.i:4:3: internal compiler error: in emit_move_insn, at expr.c:3722
__builtin_ia32_movdir64b (__P, __Q);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
0xb1c92d emit_move_insn(rtx_def*, rtx_def*)
/export/gnu/import/git/sources/gcc/gcc/expr.c:3721
0xaeef45 force_reg(machine_mode, rtx_def*)
/export/gnu/import/git/sources/gcc/gcc/explow.c:666
0x14716b3 ix86_expand_builtin
/export/gnu/import/git/sources/gcc/gcc/config/i386/i386.c:37146
0x962514 expand_builtin(tree_node*, rtx_def*, rtx_def*, machine_mode, int)
/export/gnu/import/git/sources/gcc/gcc/builtins.c:6648
0xb3d2f4 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
/export/gnu/import/git/sources/gcc/gcc/expr.c:11004
0xb2fa7d expand_expr_real(tree_node*, rtx_def*, machine_mode, expand_modifier,
rtx_def**, bool)
/export/gnu/import/git/sources/gcc/gcc/expr.c:8231
0x9988c9 expand_expr
/export/gnu/import/git/sources/gcc/gcc/expr.h:280
0x9a13a2 expand_call_stmt
/export/gnu/import/git/sources/gcc/gcc/cfgexpand.c:2690
0x9a482d expand_gimple_stmt_1
/export/gnu/import/git/sources/gcc/gcc/cfgexpand.c:3624
0x9a4f23 expand_gimple_stmt
/export/gnu/import/git/sources/gcc/gcc/cfgexpand.c:3790
0x9a5022 expand_gimple_tailcall
/export/gnu/import/git/sources/gcc/gcc/cfgexpand.c:3836
0x9ad61d expand_gimple_basic_block
/export/gnu/import/git/sources/gcc/gcc/cfgexpand.c:5796
0x9af0ba execute
/export/gnu/import/git/sources/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.
[hjl@gnu-cfl-1 gcc]$
>From gcc-bugs-return-602208-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Apr 19 23:03:28 2018
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Subject: [Bug target/85473] internal compiler error: in emit_move_insn, at expr.c:3722
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-19
Ever confirmed|0 |1
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
movdir64 stores 64 byte. But it doesn't show:
(define_insn "movdir64b_<mode>"
[(unspec_volatile:SWI48[(match_operand:SWI48 0 "register_operand" "r")
(match_operand:SWI48 1 "memory_operand")]
UNSPECV_MOVDIR64B)]
"TARGET_MOVDIR64B"
"movdir64b\t{%1, %0|%0, %1}"
[(set_attr "type" "other")])
Here register is used as address.
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Subject: [Bug target/85473] internal compiler error: in emit_move_insn, at expr.c:3722
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--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Something like this
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index dc80b34f302..99feb5ea629 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -37141,11 +37141,10 @@ ix86_expand_builtin (tree exp, rtx target, rtx
subtarget,
arg1 = CALL_EXPR_ARG (exp, 1);
op0 = expand_normal (arg0);
op1 = expand_normal (arg1);
- mode0 = (TARGET_64BIT ? DImode : SImode);
- op0 = force_reg (mode0, op0);
- if (!memory_operand (op1, mode0))
- op1 = gen_rtx_MEM (mode0, op1);
+ op0 = ix86_zero_extend_to_Pmode (op0);
+ if (!memory_operand (op1, XImode))
+ op1 = gen_rtx_MEM (XImode, op1);
insn = (TARGET_64BIT
? gen_movdir64b_di (op0, op1)
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index a134ca88014..d01e3c631b5 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -20697,8 +20697,8 @@
[(set_attr "type" "other")])
(define_insn "movdir64b_<mode>"
- [(unspec_volatile:SWI48[(match_operand:SWI48 0 "register_operand" "r")
- (match_operand:SWI48 1 "memory_operand")]
+ [(unspec_volatile:XI [(match_operand:P 0 "register_operand" "r")
+ (match_operand:XI 1 "memory_operand")]
UNSPECV_MOVDIR64B)]
"TARGET_MOVDIR64B"
"movdir64b\t{%1, %0|%0, %1}"
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Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
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--- Comment #13 from Michael Meissner <meissner at gcc dot gnu.org> ---
You can use --with-cpu=power7 as well. But if you only have power8 systems, it
is better to use --with-cpu=power8. The little endian PowerPC Linux systems
have a minimum cpu base level of power8, so float128 is available on that
platform by default.
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Subject: [Bug sanitizer/67308] FATAL: ThreadSanitizer: unexpected memory mapping
Date: Fri, 20 Apr 2018 01:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67308
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |mpolacek at gcc dot gnu.org
Resolution|--- |FIXED
--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed for GCC 7.
>From gcc-bugs-return-602212-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 01:52:48 2018
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Subject: [Bug libstdc++/85466] Performance is slow when doing 'branchless' conditional style math operations
Date: Fri, 20 Apr 2018 01:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85466
--- Comment #14 from Daniel Elliott <cpphackster at gmail dot com> ---
I had a response from chandler carruth on twitter, who informed me that the
benchark was hoisting the computation out of the loop. So thats why clang was
faster. but also he said that the noconditional version was not vectorized.
>From gcc-bugs-return-602213-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 02:07:12 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85474] New: unspecified string literal comparison accepted in constexpr context
Date: Fri, 20 Apr 2018 02:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85474
Bug ID: 85474
Summary: unspecified string literal comparison accepted in
constexpr context
Product: gcc
Version: 8.0
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Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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According to [expr.const]:
An expression e is a core constant expression unless the evaluation of e,
following the rules of the abstract machine (4.6), would evaluate one of the
following expressions:
...
-- a relational (8.9) or equality (8.10) operator where the result is
unspecified;
That means that the following program is ill-formed and needs to be rejected
with an error:
$ cat t.C && gcc -S -Wall -Wextra -Wpedantic t.C
constexpr bool b = "" == "";
t.C:1:26: warning: comparison with string literal results in unspecified
behavior [-Waddress]
constexpr bool b = "" == "";
^~
GCC accepts the program with only a warning when it should reject it with a
hard error as Clang does.
>From gcc-bugs-return-602214-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 02:10:13 2018
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Subject: [Bug c++/85474] unspecified string literal comparison accepted in constexpr context
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid
Known to fail| |5.3.0, 6.4.0, 7.3.0, 8.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
The test case was never rejected so it's not a regression.
>From gcc-bugs-return-602215-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 02:35:33 2018
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Subject: [Bug tree-optimization/85475] New: [8 Regression] Compile time hog w/ -O1 -fpeel-loops
Date: Fri, 20 Apr 2018 02:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85475
Bug ID: 85475
Summary: [8 Regression] Compile time hog w/ -O1 -fpeel-loops
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: compile-time-hog
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gcc-8.0.0-alpha20180415 snapshot (r259389) takes long (or indefinite) time to
compile the following snippet w/ -O1 (-O2) -fpeel-loops:
int
nj (int le)
{
int zb;
for (zb = 0; zb < 16; ++zb)
le += le;
return le * le;
}
% timeout 20 gcc-8.0.0-alpha20180415 -O1 -fpeel-loops -c i9xivvyu.c
zsh: exit 124 timeout 20 gcc-8.0.0-alpha20180415 -O1 -fpeel-loops -c
i9xivvyu.c
Profile captured by perf top:
41.29% cc1 [.] tree_int_cst_equal
12.86% cc1 [.] vr_values::get_value_range
11.46% cc1 [.] vrp_valueize_1
7.44% cc1 [.] gimple_simplify_MULT_EXPR
4.18% cc1 [.] integer_all_onesp
3.75% cc1 [.] integer_zerop
2.96% cc1 [.] range_int_cst_singleton_p
2.93% cc1 [.] wi::max_value
2.29% cc1 [.] range_int_cst_singleton_p
2.26% cc1 [.] gimple_simplify_233
1.44% cc1 [.] gimple_resimplify2
1.08% cc1 [.] gimple_simplify
1.03% cc1 [.] gimple_negate_expr_p
0.82% cc1 [.] maybe_push_res_to_seq
0.73% cc1 [.] tree_strip_nop_conversions
0.65% cc1 [.] tree_int_cst_equal
0.61% cc1 [.] tree_swap_operands_p
0.50% cc1 [.] real_zerop
0.41% cc1 [.] tree_swap_operands_p
0.38% cc1 [.] integer_onep
0.35% cc1 [.] real_minus_onep
0.26% cc1 [.] real_onep
0.15% cc1 [.] integer_minus_onep
0.15% cc1 [.] commutative_tree_code
>From gcc-bugs-return-602216-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 02:55:50 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85475] [8 Regression] Compile time hog w/ -O1 -fpeel-loops
Date: Fri, 20 Apr 2018 02:55:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-20
CC| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed. It looks like some sort of an infinite loop. Bisection points to
r258061:
2018-02-28 Richard Biener <rguenther@suse.de>
PR middle-end/84607
* genmatch.c (capture_info::walk_match): Do not mark
captured expressions without operands as expr_p given
they act more like predicates and should be subject to
"lost tail" side-effect preserving.
* gcc.dg/pr84607.c: New testcase.
>From gcc-bugs-return-602217-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 06:49:57 2018
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Subject: [Bug tree-optimization/85475] [8 Regression] Compile time hog w/ -O1 -fpeel-loops
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Target Milestone|--- |8.0
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.
>From gcc-bugs-return-602218-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 07:16:25 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85475] [8 Regression] Compile time hog w/ -O1 -fpeel-loops
Date: Fri, 20 Apr 2018 07:16:00 -0000
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
In dom3 I see
Applying pattern match.pd:2585, gimple-match.c:10461
Applying pattern match.pd:2585, gimple-match.c:10461
Applying pattern match.pd:2585, gimple-match.c:10461
Applying pattern match.pd:2585, gimple-match.c:10461
Applying pattern match.pd:2585, gimple-match.c:10461
Applying pattern match.pd:2585, gimple-match.c:10461
Applying pattern match.pd:2585, gimple-match.c:10461
Applying pattern match.pd:2585, gimple-match.c:10461
Applying pattern match.pd:2585, gimple-match.c:10461
Applying pattern match.pd:2585, gimple-match.c:10461
...
it is for example matching on (le_10 * 2) * (le_10 * 2), transforming
it to (le_10 * le_10) * 4 which fails because of the :s. But then DOM
faces the situation where the loop is fully unrolled and we have
nj (int le)
{
int zb;
unsigned int ivtmp_1;
int _6;
unsigned int ivtmp_16;
unsigned int ivtmp_100;
<bb 2> [local count: 63136020]:
le_14 = le_3(D) * 2;
zb_15 = 1;
ivtmp_16 = 15;
le_20 = le_14 * 2;
zb_21 = 2;
le_26 = le_20 * 2;
zb_27 = 3;
le_32 = le_26 * 2;
zb_33 = 4;
le_38 = le_32 * 2;
zb_39 = 5;
le_44 = le_38 * 2;
zb_45 = 6;
le_50 = le_44 * 2;
zb_51 = 7;
le_56 = le_50 * 2;
zb_57 = 8;
le_62 = le_56 * 2;
zb_63 = 9;
le_68 = le_62 * 2;
zb_69 = 10;
le_74 = le_68 * 2;
zb_75 = 11;
le_80 = le_74 * 2;
zb_81 = 12;
le_86 = le_80 * 2;
zb_87 = 13;
le_92 = le_86 * 2;
zb_93 = 14;
le_98 = le_92 * 2;
zb_99 = 15;
ivtmp_100 = 1;
le_4 = le_98 * 2;
zb_5 = 16;
ivtmp_1 = 0;
_6 = le_4 * le_4;
return _6;
}
with DOM folding le_4 * le_4 via gimple_fold_stmt_to_constant_1. You can
trivially see the exponential work we do when applying the pattern if you
consider that we re-simplify each simplification result.
/* Reassociate (X * CST) * Y to (X * Y) * CST. This does not introduce
signed overflow for CST != 0 && CST != -1. */
(simplify
(mult:c (mult:s @0 INTEGER_CST@1) @2)
(if (TREE_CODE (@2) != INTEGER_CST
&& !integer_zerop (@1) && !integer_minus_onep (@1))
(mult (mult @0 @2) @1)))
The issue is that we get into non-linear complexity once there's more
than a single use of the inner multiplication, so an explicit single_use
fixes that.
>From gcc-bugs-return-602219-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 07:47:51 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug objc/85476] New: ASAN error in finish_class ../../gcc/objc/objc-act.c:8006
Date: Fri, 20 Apr 2018 07:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85476
Bug ID: 85476
Summary: ASAN error in finish_class
../../gcc/objc/objc-act.c:8006
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: objc
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
Target Milestone: ---
$ ./xgcc -B.
/home/mliska/Programming/gcc/gcc/testsuite/objc.dg/class-extension-3.m
-I../../libobjc/
=================================================================
==1431542==ERROR: AddressSanitizer: dynamic-stack-buffer-overflow on address
0x7ffddc1c45e9 at pc 0x00000064ae04 bp 0x7ffddc1c45b0 sp 0x7ffddc1c3d60
WRITE of size 10 at 0x7ffddc1c45e9 thread T0
#0 0x64ae03 in __interceptor_strcpy
../../../../libsanitizer/asan/asan_interceptors.cc:391
#1 0x74629f in finish_class ../../gcc/objc/objc-act.c:8006
#2 0x74805f in objc_finish_interface() ../../gcc/objc/objc-act.c:648
#3 0x8d028e in c_parser_objc_class_definition ../../gcc/c/c-parser.c:9566
#4 0x900698 in c_parser_translation_unit ../../gcc/c/c-parser.c:1524
#5 0x900698 in c_parse_file() ../../gcc/c/c-parser.c:18428
#6 0x9c1eff in c_common_parse_file() ../../gcc/c-family/c-opts.c:1132
#7 0x190e06b in compile_file ../../gcc/toplev.c:455
#8 0x618a6d in do_compile ../../gcc/toplev.c:2132
#9 0x618a6d in toplev::main(int, char**) ../../gcc/toplev.c:2267
#10 0x6233f4 in main ../../gcc/main.c:39
#11 0x7f9c1d6786e4 in __libc_start_main (/lib64/libc.so.6+0x206e4)
#12 0x624588 in _start
(/home/mliska/Programming/gcc/objdir/gcc/cc1obj+0x624588)
Address 0x7ffddc1c45e9 is located in stack of thread T0
SUMMARY: AddressSanitizer: dynamic-stack-buffer-overflow
../../../../libsanitizer/asan/asan_interceptors.cc:391 in __interceptor_strcpy
Shadow bytes around the buggy address:
0x10003b830860: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10003b830870: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10003b830880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10003b830890: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10003b8308a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x10003b8308b0: 00 00 00 00 00 00 00 00 ca ca ca ca 00[01]cb cb
0x10003b8308c0: cb cb cb cb 00 00 00 00 00 00 00 00 00 00 00 00
0x10003b8308d0: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2
0x10003b8308e0: f2 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00
0x10003b8308f0: f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00 00
0x10003b830900: 00 00 00 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 00
It's simple to fix, let me to that.
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Subject: [Bug objc/85476] ASAN error in finish_class ../../gcc/objc/objc-act.c:8006
Date: Fri, 20 Apr 2018 07:51:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-04-20
Version|unknown |8.0.1
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
Ever confirmed|0 |1
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Subject: [Bug c++/85462] [8 Regression] internal compiler error: in inc_refcount_use, at cp/pt.c:8955
Date: Fri, 20 Apr 2018 07:57:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Apr 20 07:56:52 2018
New Revision: 259516
URL: https://gcc.gnu.org/viewcvs?rev=259516&root=gcc&view=rev
Log:
PR c++/85462
* cp-tree.h (tinst_level): Remove in_system_header_p member,
change refcount member from unsigned char to unsigned short,
add refcount_infinity static data member, adjust comments.
* pt.c (tinst_level::refcount_infinity): Define.
(inc_refcount_use): Remove assert, don't increment if refcount
is already refcount_infinity, adjust comment.
(dec_refcount_use): Remove assert, don't decrement if refcount
is refcount_infinity, adjust comment.
(push_tinst_level_loc): Formatting fix.
* g++.dg/cpp0x/pr85462.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/pr85462.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/cp-tree.h
trunk/gcc/cp/pt.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-602222-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 07:58:46 2018
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
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--- Comment #32 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to James Kuyper Jr. from comment #31)
> (In reply to rguenther@suse.de from comment #29)
> > On Thu, 19 Apr 2018, jameskuyper at verizon dot net wrote:
> ...
> > > The relevant wording is "anywhere that a declaration of the completed type of
> > > the union is visible.", so it's unambiguously the type, not the object, which
> > > must be visible. A declaration of the completed type can be visible without any
> > > objects of that type being visible, and that's sufficient for this rule to
> > > apply.
> > >
> > > > ... Must the access be performed
> > > > using the union object, or just the union type, or neither?
> > >
> > > It says only that "it is permitted to inspect the common initial part"; it
> > > imposes no restrictions on how the inspection may be performed. Clearly,
> > > inspection through an lvalue of the union's type must be permitted, but it is
> > > also permitted to use the more indirect methods which are the subject of this
> > > bug report, simply because the standard says nothing to restrict the permission
> > > it grants to the more direct cases.
> >
> > Note I repeatedly said this part of the standard is just stupid.
>
> As a judgement call, I reserve the right to disagree with you on that point,
> particularly if that judgement was based primarily on the following
> misconception:
>
> > ... It makes
> > most if not all type-based alias analysis useless.
>
> How could that be true? It only applies to pairs of struct types that are
> the types of members of the same union, it only applies within the scope of
> a completed definition of that union's type, and it doesn't apply if the
> implementation can prove to itself that the two objects in question are not
> actually members of the same union object. It seems to me that the need to
> take this rule into consideration would come up pretty infrequently.
Elsewhere you said that "inspect the common initial part" needs to allow
accesses that do not make the union object visible. So consider
struct A { int i; float f; };
struct B { int i; double e; };
union { struct A a; struct B b; };
struct B b;
struct A a;
int foo1 (struct A *p)
{
return p->i; // GCC considers this to not alias 'b', but only 'a'
}
int foo2 (int *p)
{
return *p; // GCC considers this to alias 'b' and 'a'
}
float foo3 (float *p)
{
return *p; // GCC considers this to alias only 'a'
}
I guess foo3 is not allowed since 6.5.2.3p6 doesn't allow any type punning
since it only covers the common initial sequence. We are too strict with
foo1 I guess, with our current implementation I can't see to make that
work without making *p alias 'b' as well.
Now consider
struct C { int i; };
union { struct A a; struct C; };
struct A a;
struct C c;
void foo (struct C *p)
{
*p = c;
}
do we need to consider this to assign to 'a'? As far as I read the
standard yes. We don't handle that, and as I said above this would
mean C and A to have the same alias-set which means now float *
also aliases objects of type B and double * objects of type A.
It doesn't make float * alias double * of course, so it's not all
bets are off but it means that for a program using C++-like
inheritance via unions (like GCC for example does) you mostly
give up on TBAA.
> Code which relies upon this feature to implement a C-style approximation to
> inheritance has been fairly common, which is precisely why the C committee
> decided to create this rule, to make sure such code had well-defined
> behavior.
>
> > Which means I'll refuse any patches implementing it in a way that affects
> > default behavior. A clean patch (I really can't think of any clean
> > approach besides forcing -fno-strict-aliasing!) with some extra flag
> > (well, just use -fno-strict-aliasing ...) would be fine with me.
>
> I can understanding not making this the default behavior if you feel that
> way; I only use gcc in fully standard-conforming mode, anyway, so that
> doesn't matter to me. However, personally, I would prefer it if gcc's
> fully-conforming mode took full advantage of all the optimization
> opportunities legitimately enabled by 6.5p7 (which does not include
> opportunities revoked by 6.5.2.3p6).
As the examples above show and probably because of the limited TBAA
implementation in GCC honoring 6.5.2.3p6 comes at a cost. I'm not
sure why 6.5.2.3p6 is necessary given 6.5.2.3p3 points to the footnote
95 which allows to do the inspection under the type-punning umbrella
if the access is made through the union type.
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Subject: [Bug tree-optimization/85406] Unnecessary blend when vectorizing short-cutted calculations
Date: Fri, 20 Apr 2018 08:05:00 -0000
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--- Comment #3 from Allan Jensen <linux at carewolf dot com> ---
You need to add the loop around it
void test(unsigned *buffer, int count)
{
for (int i = 0; i < count; ++i)
buffer[i] = qPremultiply(buffer[i]);
}
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85462] [8 Regression] internal compiler error: in inc_refcount_use, at cp/pt.c:8955
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-602225-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 08:19:23 2018
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From: "belous.vs at yandex dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/85477] New: IO_old_cookie_seek is called instead of _IO_cookie_seek when compiled with -fsanitizedress
Date: Fri, 20 Apr 2018 08:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85477
Bug ID: 85477
Summary: IO_old_cookie_seek is called instead of
_IO_cookie_seek when compiled with -fsanitize=address
Product: gcc
Version: 7.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: belous.vs at yandex dot ru
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at gcc dot gnu.org
Target Milestone: ---
Created attachment 43994
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43994&action=edit
source
# gcc -v -g -Wall -Wextra -Werror -fsanitize=address x.c
`Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i686-redhat-linux/7.2.1/lto-wrapper
Target: i686-redhat-linux
Configured with: ../configure --enable-bootstrap
--enable-languages=c,c++,objc,obj-c++,lto --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla
--enable-shared --enable-threads=posix --enable-checking=release
--enable-multilib --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-gnu-unique-object
--enable-linker-build-id --with-linker-hash-style=gnu
--bindir=/usr/lib/gcc/i686-redhat-linux/7.2.1/bin
--localedir=/usr/share/gcc72-7.2.1/locale --enable-plugin
--enable-initfini-array --disable-libgcj --with-isl --enable-libmpx
--enable-gnu-indirect-function --with-tune=generic --with-arch=i686
--build=i686-redhat-linux
Thread model: posix
gcc version 7.2.1 20170829 (Red Hat 7.2.1-1.ac2) (GCC)
COLLECT_GCC_OPTIONS='-v' '-g' '-Wall' '-Wextra' '-Werror' '-fsanitize=address'
'-mtune=generic' '-march=i686'
/usr/libexec/gcc/i686-redhat-linux/7.2.1/cc1 -quiet -v x.c -quiet -dumpbase
x.c -mtune=generic -march=i686 -auxbase x -g -Wall -Wextra -Werror -version
-fsanitize=address -o /tmp/ccUnYl25.s
GNU C11 (GCC) version 7.2.1 20170829 (Red Hat 7.2.1-1.ac2) (i686-redhat-linux)
compiled by GNU C version 7.2.1 20170829 (Red Hat 7.2.1-1.ac2), GMP
version 6.1.2, MPFR version 3.1.5, MPC version 1.0.3, isl version none
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"/usr/lib/gcc/i686-redhat-linux/7.2.1/include-fixed"
ignoring nonexistent directory
"/usr/lib/gcc/i686-redhat-linux/7.2.1/../../../../i686-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/i686-redhat-linux/7.2.1/include
/usr/local/include
/usr/include
End of search list.
GNU C11 (GCC) version 7.2.1 20170829 (Red Hat 7.2.1-1.ac2) (i686-redhat-linux)
compiled by GNU C version 7.2.1 20170829 (Red Hat 7.2.1-1.ac2), GMP
version 6.1.2, MPFR version 3.1.5, MPC version 1.0.3, isl version none
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 2cc28a180c8eaf4513b3c8e8607ca785
COLLECT_GCC_OPTIONS='-v' '-g' '-Wall' '-Wextra' '-Werror' '-fsanitize=address'
'-mtune=generic' '-march=i686'
as -v --32 -o /tmp/cc34VkHR.o /tmp/ccUnYl25.s
GNU assembler version 2.25 (i686-redhat-linux) using BFD version version
2.25-5.el6
COMPILER_PATH=/usr/libexec/gcc/i686-redhat-linux/7.2.1/:/usr/libexec/gcc/i686-redhat-linux/7.2.1/:/usr/libexec/gcc/i686-redhat-linux/:/usr/lib/gcc/i686-redhat-linux/7.2.1/:/usr/lib/gcc/i686-redhat-linux/
LIBRARY_PATH=/usr/lib/gcc/i686-redhat-linux/7.2.1/:/usr/lib/gcc/i686-redhat-linux/7.2.1/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-g' '-Wall' '-Wextra' '-Werror' '-fsanitize=address'
'-mtune=generic' '-march=i686'
/usr/libexec/gcc/i686-redhat-linux/7.2.1/collect2 -plugin
/usr/libexec/gcc/i686-redhat-linux/7.2.1/liblto_plugin.so
-plugin-opt=/usr/libexec/gcc/i686-redhat-linux/7.2.1/lto-wrapper
-plugin-opt=-fresolution=/tmp/cc8BZlnD.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
--no-add-needed --eh-frame-hdr --hash-style=gnu -m elf_i386 -dynamic-linker
/lib/ld-linux.so.2 /usr/lib/gcc/i686-redhat-linux/7.2.1/../../../crt1.o
/usr/lib/gcc/i686-redhat-linux/7.2.1/../../../crti.o
/usr/lib/gcc/i686-redhat-linux/7.2.1/crtbegin.o
-L/usr/lib/gcc/i686-redhat-linux/7.2.1
-L/usr/lib/gcc/i686-redhat-linux/7.2.1/../../..
/usr/lib/gcc/i686-redhat-linux/7.2.1/libasan_preinit.o -lasan /tmp/cc34VkHR.o
-lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s
--no-as-needed /usr/lib/gcc/i686-redhat-linux/7.2.1/crtend.o
/usr/lib/gcc/i686-redhat-linux/7.2.1/../../../crtn.o
COLLECT_GCC_OPTIONS='-v' '-g' '-Wall' '-Wextra' '-Werror' '-fsanitize=address'
'-mtune=generic' '-march=i686'`
#./a.out:
`ASAN:DEADLYSIGNAL
=================================================================
==3549==ERROR: AddressSanitizer: SEGV on unknown address 0x00000004 (pc
0x080488e2 bp 0xbffff54c sp 0xbffff514 T0)
==3549==The signal is caused by a READ memory access.
==3549==Hint: address points to the zero page.
#0 0x80488e1 in io_seek /builddir/repo/mpopd_parser/tmp/x.c:25
#1 0xb799865b in _IO_old_cookie_seek (/lib/libc.so.6+0x12565b)
#2 0xb78df73a in _IO_file_seekoff@@GLIBC_2.1 (/lib/libc.so.6+0x6c73a)
#3 0xb78d4216 in _IO_cookie_seekoff (/lib/libc.so.6+0x61216)
#4 0xb78d5ca7 in _IO_seekoff_unlocked (/lib/libc.so.6+0x62ca7)
#5 0xb78dc9ed in fseeko (/lib/libc.so.6+0x699ed)
#6 0x8048d8b in main /builddir/repo/mpopd_parser/tmp/x.c:66
#7 0xb7889d25 in __libc_start_main (/lib/libc.so.6+0x16d25)
#8 0x80487a0 (/builddir/repo/mpopd_parser/tmp/a.out+0x80487a0)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /builddir/repo/mpopd_parser/tmp/x.c:25 in
io_seek
==3549==ABORTING`
When compiling without `-fsanitize=address`, or using older gcc (4.9.3), all is
ok (in this case `_IO_cookie_seek` is called instead of `IO_old_cookie_seek`).
>From gcc-bugs-return-602226-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 08:26:02 2018
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Subject: [Bug sanitizer/85477] IO_old_cookie_seek is called instead of _IO_cookie_seek when compiled with -fsanitizedress
Date: Fri, 20 Apr 2018 08:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85477
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-04-20
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Let me take a look.
>From gcc-bugs-return-602227-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 08:27:38 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Fri, 20 Apr 2018 08:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65892
--- Comment #33 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #30)
> Richard, I offered to write a proposal (with Clark) to improve the rules.
> With the object model proposals already in the pipeline (N2223) this is a
> good time to review them and see if it makes sense to extend or change them
> to also cover this case in an acceptable way. It would be helpful if you
> could take some time to summarize your main concerns or suggestions for
> changes in this area. I can start working on the proposal for the fall 2018
> WG14 meeting.
That's a load of information dangling from
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2223.htm (if I googled that
correctly). It seems to be mostly
questions and observations plus opinions being raised, sometimes obvious cases
missing and "recent" (> GCC 4.5) GCC behavior not correctly reflected.
I'm not sure in which form I can provide useful feedback here, just to mention
a few misconceptions the authors have from browsing part of the material:
- they say memcpy transfers the effective type, in other parts of the standard
it says that memcpy accesses use a character type. That raises the question
whether a memcpy implementation using a sequence of char reads/writes matches
this semantics and thus what the effective type of the memory location
written
to via a character type is -- is it allowed to access that via any other
effective type (or just the effective type of the source if that is somehow
visible to the compiler)?
- when asking for a char[] array to be treated the same as allocated storage
with respect to changing its effective type (declared objects have a fixed
effective type) they fail to consider the issue that we recently ran into
with C++:
struct { int i; char buf[4]; } s, r;
*(float *)s.buf = 1.;
r = s;
how does the aggregate copying work? The effective type of the access
is not compatible with the emplaced float which means it doesn't work
in GCC. Same if you replace all of the above with allocated storage.
Does that mean a structure with char members are somehow special?
So overall there's too much material to go over - what's the exact standard
wording changes suggested? Maybe I just didn't find them ...
>From gcc-bugs-return-602228-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 08:28:46 2018
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From: "linux at carewolf dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/85406] Unnecessary blend when vectorizing short-cutted calculations
Date: Fri, 20 Apr 2018 08:28:00 -0000
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--- Comment #4 from Allan Jensen <linux at carewolf dot com> ---
Created attachment 43995
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43995&action=edit
gccbug85406.cpp
This version compiles with a pcmpeqd and pandn instead of a blend, but the
principle is the same.
Though the last of a ptest in the beginning is worse, as that risks a
performance regression compared to non-vectorized.
>From gcc-bugs-return-602229-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 08:31:53 2018
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Subject: [Bug target/83838] Many gcc.target/i386/indirect-thunk*.c tests FAIL
Date: Fri, 20 Apr 2018 08:31:00 -0000
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Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|i386-pc-solaris2.* |i386-pc-solaris2.10
Status|WAITING |NEW
--- Comment #7 from Rainer Orth <ro at gcc dot gnu.org> ---
In the meantime, I've enabled HIDDEN_LINKONCE on Solaris 11/x86. However, this
(and COMDAT support) isn't possible on Solaris 10/x86 or is out of scope for
GCC 8.
So the ton of failures remains on Solaris 10/x86.
>From gcc-bugs-return-602230-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 08:39:48 2018
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Subject: [Bug target/59664] avx512f-ceil-sfix-vec-2.c and avx512f-floor-sfix-vec-2.c FAIL on Solaris9/x86
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Rainer Orth <ro at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
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--- Comment #8 from Rainer Orth <ro at gcc dot gnu.org> ---
Closing, Solaris 9 support is long gone.
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Subject: [Bug go/59453] log/syslog FAILs on Solaris 9
Date: Fri, 20 Apr 2018 08:40:00 -0000
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Rainer Orth <ro at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Rainer Orth <ro at gcc dot gnu.org> ---
Closing, Solaris 9 support is long gone.
>From gcc-bugs-return-602232-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 08:41:13 2018
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Subject: [Bug go/59452] net FAILs on Solaris 9
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Rainer Orth <ro at gcc dot gnu.org> changed:
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--- Comment #5 from Rainer Orth <ro at gcc dot gnu.org> ---
Closing, Solaris 9 support is long gone.
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Subject: [Bug target/58111] 32-bit gcc.target/i386/pr55342.c FAILs
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Rainer Orth <ro at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Rainer Orth <ro at gcc dot gnu.org> ---
Long fixed.
>From gcc-bugs-return-602234-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 08:42:58 2018
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Subject: [Bug c++/56326] g++.dg/gomp/tls-wrap4.C and g++.dg/tls/thread_local-wrap4.C FAIL on Solaris 9/x86
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Rainer Orth <ro at gcc dot gnu.org> changed:
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--- Comment #6 from Rainer Orth <ro at gcc dot gnu.org> ---
Closing, Solaris 9 support is long gone.
>From gcc-bugs-return-602235-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 08:44:09 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/85406] Unnecessary blend when vectorizing short-cutted calculations
Date: Fri, 20 Apr 2018 08:44:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|WAITING |NEW
Blocks| |53947
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think it's too much asked from GCC to prove that if a == 255 the computation
in the else path would result in x. The simplest fix would be to remove the
conditional in the source.
It's true that GCC doesn't evaluate costs of the vectorization properly
as it looks at the if-converted copy when calculating the cost of the
scalar loop. OTOH any estimate on how often the shortcut triggers
compared to the computation might be off and a conservative estimate may
cause us to not vectorize and thus slow down the code.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
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Subject: [Bug tree-optimization/85478] New: ICE with single element vector
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85478
Bug ID: 85478
Summary: ICE with single element vector
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
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Created attachment 43996
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43996&action=edit
Autoreduced testcase
Compiling the attached testcase triggers an ICE
cc1plus -march=arch12 -O3 -fpermissive t.cc
Performing interprocedural optimizations
<*free_lang_data> <visibility> <build_ssa_passes> <opt_local_passes>
<targetclone> <free-fnsummary> <whole-program> <profile_estimate> <icf>
<devirt> <cp> <fnsummary> <inline> <pure-const> <free-fnsummary> <static-var>
<single-use> <comdats>Assembling functions:
<materialize-all-clones> s<ae>& s<ae>::operator=(const s<t>&) [with t =
ab<float>; ae = ab<long double>]during GIMPLE pass: vect
t2.cc: In member function ‘s<ae>& s<ae>::operator=(const s<t>&) [with t =
ab<float>; ae = ab<long double>]’:
t2.cc:39:8: internal compiler error: in exact_div, at poly-int.h:2139
s<ae> &s<ae>::operator=(const s<t> &g) {
^~~~~
0x21e8941 poly_int<1u, poly_result<unsigned long, if_nonpoly<int, int,
poly_int_traits<int>::is_poly>::type, poly_coeff_pair_traits<unsigned long,
if_nonpoly<int, int, poly_int_traits<int>::is_poly>::type>::result_kind>::type>
exact_div<1u, unsigned long, int>(poly_int_pod<1u, unsigned long> const&, int)
/home/andreas/build/../gcc/gcc/poly-int.h:2139
0x21e8941 vect_grouped_store_supported(tree_node*, unsigned long)
/home/andreas/build/../gcc/gcc/tree-vect-data-refs.c:5150
0x1ce5115 vect_analyze_loop_2
/home/andreas/build/../gcc/gcc/tree-vect-loop.c:2495
0x1ce5115 vect_analyze_loop(loop*, _loop_vec_info*)
/home/andreas/build/../gcc/gcc/tree-vect-loop.c:2621
0x1d03e13 vectorize_loops()
/home/andreas/build/../gcc/gcc/tree-vectorizer.c:664
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/85477] IO_old_cookie_seek is called instead of _IO_cookie_seek when compiled with -fsanitizedress
Date: Fri, 20 Apr 2018 08:53:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
It's dup. With the fix I see:
$ gcc -m32 -fsanitize=undefined,address pr85477.c && ./a.out
ASAN:DEADLYSIGNAL
=================================================================
==24720==ERROR: AddressSanitizer: SEGV on unknown address 0xf7fe82f0 (pc
0xf7fe8304 bp 0xf7b5c320 sp 0xffffcdec T16777215)
==24720==The signal is caused by a WRITE memory access.
#0 0xf7fe8303 in _dl_get_tls_static_info (/lib/ld-linux.so.2+0x12303)
#1 0xf7acce69 (/usr/lib/libasan.so.4+0x104e69)
#2 0xf7ab8a65 (/usr/lib/libasan.so.4+0xf0a65)
#3 0xf7fe5c7a in _dl_init (/lib/ld-linux.so.2+0xfc7a)
#4 0xf7fd6cb9 (/lib/ld-linux.so.2+0xcb9)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/lib/ld-linux.so.2+0x12303) in
_dl_get_tls_static_info
==24720==ABORTING
*** This bug has been marked as a duplicate of bug 84761 ***
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Subject: [Bug sanitizer/84761] AddressSanitizer is not compatible with glibc 2.27 on x86
Date: Fri, 20 Apr 2018 08:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84761
Martin Liška <marxin at gcc dot gnu.org> changed:
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CC| |belous.vs at yandex dot ru
--- Comment #11 from Martin Liška <marxin at gcc dot gnu.org> ---
*** Bug 85477 has been marked as a duplicate of this bug. ***
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From: "krebbel at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/85478] ICE with single element vector
Date: Fri, 20 Apr 2018 08:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85478
--- Comment #1 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
The testcases ICEs since r253196:
S/390: Set the preferred mode for float vectors
gcc/ChangeLog:
2017-09-26 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* config/s390/s390.c (s390_preferred_simd_mode): Return V4SFmode
for SFmode.
with:
during RTL pass: reload
t2.cc: In member function ‘dealii::FullMatrix<number>&
dealii::FullMatrix<number>::operator=(const dealii::FullMatrix<number2>&) [with
number2 = std::complex<float>; number = std::complex<long double>]’:
t2.cc:199:3: internal compiler error: Max. number of generated reload insns per
insn is achieved (90)
}
^
0x185f553 lra_constraints(bool)
/home/andreas/gcc/gcc/lra-constraints.c:4756
0x1845459 lra(_IO_FILE*)
/home/andreas/gcc/gcc/lra.c:2390
0x17f260b do_reload
/home/andreas/gcc/gcc/ira.c:5440
0x17f260b execute
/home/andreas/gcc/gcc/ira.c:5624
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.
With the poly-int patches the ICE is triggered during vectorization already
probably papering over the original ICE.
With the patch posted here the vectorization will not continue and does not
appear to end up in that situation anymore:
https://gcc.gnu.org/ml/gcc-patches/2018-04/msg00758.html
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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85479] New: ice in inc_refcount_use
Date: Fri, 20 Apr 2018 09:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85479
Bug ID: 85479
Summary: ice in inc_refcount_use
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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Created attachment 43997
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43997&action=edit
gzipped C++ source code
The attached C++ code, when compiled by recent trunk gcc, does this:
In file included from array_real.cpp:28:
array_tlp.hpp: In instantiation of ‘void ArrayOperator() [with K = double; Z =
l
ong int]’:
array_real.cpp:44:32: required from here
array_tlp.hpp:1703:27: internal compiler error: in inc_refcount_use, at
cp/pt.c:
8955
0x63784e inc_refcount_use
../../trunk/gcc/cp/pt.c:8955
0x63784e set_refcount_ptr<tinst_level>
../../trunk/gcc/cp/pt.c:8994
0x998992 push_tinst_level_loc
../../trunk/gcc/cp/pt.c:10152
The new bug seems to exist between revision 259439 and 259515.
I will have my usual go at reducing the code.
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Subject: [Bug target/85480] New: zero extension from xmm to zmm via _mm512_insert???x? not optimized
Date: Fri, 20 Apr 2018 09:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85480
Bug ID: 85480
Summary: zero extension from xmm to zmm via _mm512_insert???x?
not optimized
Product: gcc
Version: 8.0.1
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Test case (cf. https://godbolt.org/g/p4Kt8X):
#include <x86intrin.h>
__m512 zero_extend2(__m128 a) {
return _mm512_insertf32x4(__m512(), a, 0);
}
__m512d zero_extend2(__m128d a) {
return _mm512_insertf64x2(__m512d(), a, 0);
}
__m512i zero_extend2(__m128i a) {
return _mm512_inserti32x4(__m512i(), a, 0);
}
These 3 functions should compile to `vmovaps %xmm0, %xmm0`, `vmovapd %xmm0,
%xmm0`, and `vmovdqa %xmm0, %xmm0`, respectively.
GCC detects the optimization for the xmm->ymm and ymm->zmm cases already. It's
only missing for the xmm->zmm case.
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Subject: [Bug ipa/85447] [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
Date: Fri, 20 Apr 2018 09:06:00 -0000
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--- Comment #9 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Eventually, we have decided to go for a more limited fix which I have posted to
the mailing list: https://gcc.gnu.org/ml/gcc-patches/2018-04/msg00995.html
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
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--- Comment #11 from Martin Jambor <jamborm at gcc dot gnu.org> ---
I have posted the following fix to the mailing list:
https://gcc.gnu.org/ml/gcc-patches/2018-04/msg00996.html
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85462] [8 Regression] internal compiler error: in inc_refcount_use, at cp/pt.c:8955
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |dcb314 at hotmail dot com
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 85479 has been marked as a duplicate of this bug. ***
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Subject: [Bug c++/85479] ice in inc_refcount_use
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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> ---
just fixed
*** This bug has been marked as a duplicate of bug 85462 ***
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Subject: [Bug target/85480] zero extension from xmm to zmm via _mm512_insert???x? not optimized
Date: Fri, 20 Apr 2018 09:17:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think I noted it elsewhere already (in vectorizer context), the patterns are
somewhat incomplete.
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Subject: [Bug c++/85481] New: ICE in maybe_explain_implicit_delete
Date: Fri, 20 Apr 2018 09:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85481
Bug ID: 85481
Summary: ICE in maybe_explain_implicit_delete
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: krebbel at gcc dot gnu.org
Target Milestone: ---
Created attachment 43998
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43998&action=edit
Autoreduced testcase
cc1plus t.cc
} class b {
t.cc:2:1: error: expected ‘,’ or ‘...’ before ‘}’ token
)
^
t.cc:2:2: error: expected ‘;’ after class definition
^
t.cc:3:14: error: expected ‘;’ at end of member declaration
t.cc:4:2: error: expected ‘;’ after class definition
} class B { virtual ~B(;
b d
^
;
t.cc:5:2: error: expected ‘;’ after class definition
} template class : B {
^
;
t.cc:5:22: error: expected ‘}’ at end of input
} template class : B {
^
t.cc:5:18: error: use of deleted function ‘b::~b()’
} template class : B {
^
t.cc:3:7: internal compiler error: in maybe_explain_implicit_delete, at
cp/method.c:1873
a c ~b() = default
^
0x12e6821 maybe_explain_implicit_delete(tree_node*)
/home/andreas/build/../gcc/gcc/cp/method.c:1873
0x12888b1 mark_used(tree_node*, int)
/home/andreas/build/../gcc/gcc/cp/decl2.c:5255
0x11ad759 build_over_call
/home/andreas/build/../gcc/gcc/cp/call.c:7736
0x11b221b build_new_method_call_1
/home/andreas/build/../gcc/gcc/cp/call.c:9378
0x11b221b build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
/home/andreas/build/../gcc/gcc/cp/call.c:9453
0x12da887 locate_fn_flags
/home/andreas/build/../gcc/gcc/cp/method.c:1024
0x12ddee3 walk_field_subobs
/home/andreas/build/../gcc/gcc/cp/method.c:1439
0x12dedab synthesized_method_walk
/home/andreas/build/../gcc/gcc/cp/method.c:1741
0x12e38f3 get_defaulted_eh_spec(tree_node*, int)
/home/andreas/build/../gcc/gcc/cp/method.c:1775
0x13c5105 maybe_instantiate_noexcept(tree_node*, int)
/home/andreas/build/../gcc/gcc/cp/pt.c:23256
0x13d9de5 check_final_overrider
/home/andreas/build/../gcc/gcc/cp/search.c:1935
0x13d9de5 look_for_overrides_r
/home/andreas/build/../gcc/gcc/cp/search.c:2089
0x13d9de5 look_for_overrides(tree_node*, tree_node*)
/home/andreas/build/../gcc/gcc/cp/search.c:2034
0x11d6b8d check_for_override(tree_node*, tree_node*)
/home/andreas/build/../gcc/gcc/cp/class.c:2774
0x12e1a13 lazily_declare_fn(special_function_kind, tree_node*)
/home/andreas/build/../gcc/gcc/cp/method.c:2404
0x11c9125 dfs_declare_virt_assop_and_dtor
/home/andreas/build/../gcc/gcc/cp/class.c:3011
0x13d4d57 dfs_walk_all(tree_node*, tree_node* (*)(tree_node*, void*),
tree_node* (*)(tree_node*, void*), void*)
/home/andreas/build/../gcc/gcc/cp/search.c:1410
0x13d4ded dfs_walk_all(tree_node*, tree_node* (*)(tree_node*, void*),
tree_node* (*)(tree_node*, void*), void*)
/home/andreas/build/../gcc/gcc/cp/search.c:1422
0x11ea4c5 declare_virt_assop_and_dtor
/home/andreas/build/../gcc/gcc/cp/class.c:3030
0x11ea4c5 add_implicitly_declared_members
/home/andreas/build/../gcc/gcc/cp/class.c:3170
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From: "krebbel at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85478] ICE with single element vector
Date: Fri, 20 Apr 2018 09:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85478
--- Comment #2 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
I've opened another bugzilla for a probably unrelated problem triggered by a
testcase reduce from the same source file:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85481
>From gcc-bugs-return-602249-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 09:27:23 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/85482] New: unnecessary vmovaps/vmovapd/vmovdqa emitted
Date: Fri, 20 Apr 2018 09:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85482
Bug ID: 85482
Summary: unnecessary vmovaps/vmovapd/vmovdqa emitted
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
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Test case (cf. https://godbolt.org/g/QkJYSK):
#include <x86intrin.h>
__m256 zero_extend1(__m128 a) {
return _mm256_insertf128_ps(__m256(), a, 0);
}
__m256d zero_extend1(__m128d a) {
return _mm256_insertf128_pd(__m256d(), a, 0);
}
__m256i zero_extend1(__m128i a) {
return _mm256_insertf128_si256(__m256i(), a, 0);
}
__m512 zero_extend2(__m128 a) {
return _mm512_insertf32x4(__m512(), a, 0);
}
__m512d zero_extend2(__m128d a) {
return _mm512_insertf64x2(__m512d(), a, 0);
}
__m512i zero_extend2(__m128i a) {
return _mm512_inserti32x4(__m512i(), a, 0);
}
__m512 zero_extend3(__m256 a) {
return _mm512_insertf32x8(__m512(), a, 0);
}
__m512d zero_extend3(__m256d a) {
return _mm512_insertf64x4(__m512d(), a, 0);
}
__m512i zero_extend3(__m256i a) {
return _mm512_inserti64x4(__m512i(), a, 0);
}
template <class T> T blackhole;
void test(void *mem) {
blackhole<__m256 > = zero_extend1(_mm_load_ps((float *)mem));
blackhole<__m256d> = zero_extend1(_mm_load_pd((double *)mem));
blackhole<__m256i> = zero_extend1(_mm_load_si128((__m128i *)mem));
blackhole<__m512 > = zero_extend2(_mm_load_ps((float *)mem));
blackhole<__m512d> = zero_extend2(_mm_load_pd((double *)mem));
blackhole<__m512i> = zero_extend2(_mm_load_si128((__m128i *)mem));
blackhole<__m512 > = zero_extend3(_mm256_load_ps((float *)mem));
blackhole<__m512d> = zero_extend3(_mm256_load_pd((double *)mem));
blackhole<__m512i> = zero_extend3(_mm256_load_si256((__m256i *)mem));
}
Between every load and store instruction in the `test` function, the
vmov(aps|apd|dqa) is superfluous. The preceding load instruction already zeroes
the high bits. Instead of the load instruction, there could also be a different
instructions, or instruction sequences, that already guarantee the high bits to
be zero.
>From gcc-bugs-return-602250-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 09:27:51 2018
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Subject: [Bug target/85482] unnecessary vmovaps/vmovapd/vmovdqa emitted
Date: Fri, 20 Apr 2018 09:27:00 -0000
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Matthias Kretz <kretz at kde dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |x86_64-*-*, i?86-*-*
--- Comment #1 from Matthias Kretz <kretz at kde dot org> ---
related to PR85480
>From gcc-bugs-return-602251-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 09:29:58 2018
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Fri, 20 Apr 2018 09:29:00 -0000
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Dennis Clarke <dclarke at blastwave dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work|8.0 |
--- Comment #14 from Dennis Clarke <dclarke at blastwave dot org> ---
We are going in circles here.
Neither libquadmath nor the required header exist nor function on the
powerpc64 target wherein the processor is NOT an IBM power type unit.
It is NOT known to work with gcc version 8 either as I have tested for
that and the answer is a clear no.
This is NOT a power8 nor a power7 nor any version thereof. This is the
classic IBM PowerPC 970FX processor.
This is big endian.
There is NOT an option for "VSX by default".
The real issue seems to lay down inside glibc, which I was looking at
from the very beginning and I had already said the "non-IBM Power
variations are simply not supported" and in glibc 2.26 we see :
On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
To compile programs that use this feature, the compiler must support
128-bit floating point with the type name _Float128 (as defined by TS
18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
must be defined to make the new interfaces visible.
The new functions and macros correspond to those present for other
floating-point types (except for a few obsolescent interfaces not
supported for the new type), with F128 or f128 suffixes; for example,
strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
printf or scanf formats for the new type; the strfromf128 and strtof128
interfaces should be used instead.
This was soon followed by 2.27 wherein :
On platforms where long double has the IEEE binary128 format (aarch64,
alpha, mips64, riscv, s390 and sparc), the math library now implements
_Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
These are the same interfaces added in version 2.26 for some platforms where
this format is supported but is not the format of long double.
However the gcc version 8 20180415 will compile C source and produce assembly
that clearly uses the 128-bit IEEE 754-2008 format for floating point data
however the options for -mfloat128 and -mfloat128-hardware clearly won't work
here. The manual page is slightly misleading for "RS/6000 and PowerPC" options
as really there needs to exist a page for "IBM Power" options.
The options for abi ibmlongdouble and ieeelongdouble both work as expected and
I
have already shown that along with the output assembly wherein we do actually
get both 128-bit datatypes :
gcc: warning: using IBM extended precision long double
cc1: warning: using IBM extended precision long double
.quad 0x400921fb54442d18,0x3ca1a62633145c06
$ /usr/local/gcc7/bin/gcc -m64 -g -Wl,-rpath=/usr/local/lib -mcpu=970 -maltivec
-mfull-toc -mregnames -mabi=ieeelongdouble -S -o ld.s ld.c ; grep "quad" ld.s |
grep "0x"
gcc: warning: using IEEE extended precision long double
cc1: warning: using IEEE extended precision long double
.quad 0x4000921fb54442d1,0x8469898cc51701b8
Regardless how you slice it here and want to say "works in ver 8" it simply
does
not and I have a powerpc 64-bit big-endian machine right here that bootstraps
both version 7.3.0 and the available ver 8 test tarball just fine. Neither can
do anything with libquadmath on this architecture as it is clearly not one of
the IBM Power variants under Power ISA v.2.07 spec. Perhaps there needs to be
a new manual page for "IBM RS/6000 and PowerPC Options" because really there
exists the "IBM Power" systems and then the older "IBM RS/6000 and PowerPC
Options".
That may also cover the whole SoC type chips that we saw so many of from
FreeScale
and Motorola at one point.
Someone, whomever it is, stop flipping this as "known to work on 8" where that
just isn't true.
>From gcc-bugs-return-602252-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 09:35:53 2018
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Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Fri, 20 Apr 2018 09:35:00 -0000
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--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
For libquadmath you need a working __float128 support. On x86_64, i686 and
ia64 this is done through a slow software emulation in libgcc. On powerpc*,
there is either a software emulation which requires VSX, or hardware
implementation which requires power9. On s390 there is hardware
implementation, but long double is already quad, so you don't need libquadmath.
For everything else, just use mpfr.
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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/85478] ICE with single element vector
Date: Fri, 20 Apr 2018 09:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85478
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, it doesn't seem to ICE for me (with a cross from x86_64-linux). I
configured with --target s390x-linux-gnu
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From: "jamborm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/85447] [8 Regression] ICE in create_specialized_node, at ipa-cp.c:3870 since r259319
Date: Fri, 20 Apr 2018 09:40:00 -0000
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Martin Jambor <jamborm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #10 from Martin Jambor <jamborm at gcc dot gnu.org> ---
I forgot to put letters "PR" to the bug reference, anyway fixed with:
Author: jamborm
Date: Fri Apr 20 09:19:39 2018
New Revision: 259517
URL: https://gcc.gnu.org/viewcvs?rev=259517&root=gcc&view=rev
Log:
Check that clones of edges exist during IPA-CP
2018-04-20 Martin Jambor <mjambor@suse.cz>
ipa/85447
* ipa-cp.c (create_specialized_node): Check that clones of
self-recursive edges exist during IPA-CP.
testsuite/
* g++.dg/ipa/pr85447.C: New file.
* gcc.dg/ipa/ipcp-self-recursion-1.c: Likewise.
Added:
trunk/gcc/testsuite/g++.dg/ipa/pr85447.C
trunk/gcc/testsuite/gcc.dg/ipa/ipcp-self-recursion-1.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ipa-cp.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-602255-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 09:40:54 2018
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
Date: Fri, 20 Apr 2018 09:40:00 -0000
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Martin Jambor <jamborm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #12 from Martin Jambor <jamborm at gcc dot gnu.org> ---
I forgot to put letters "PR" to the bug reference, anyway fixed with:
Author: jamborm
Date: Fri Apr 20 09:35:33 2018
New Revision: 259518
URL: https://gcc.gnu.org/viewcvs?rev=259518&root=gcc&view=rev
Log:
Fix IPA-CP test for self-feeding recursive dependency
2018-04-20 Martin Jambor <mjambor@suse.cz>
ipa/85449
* ipa-cp.c (cgraph_edge_brings_value_p): Move check for self-feeding
recursion dependency to only apply to non-clones.
testsuite/
* gcc.dg/ipa/pr85449.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/ipa/pr85449.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ipa-cp.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-602256-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 09:52:30 2018
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Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Fri, 20 Apr 2018 09:52:00 -0000
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--- Comment #16 from Dennis Clarke <dclarke at blastwave dot org> ---
Dear Jakub Jelinek :
Exactly.
Yes, I think the libmpfr/libgmp seem to work perfectly here but
the real issue is that the old 970 and pre Power ISA v.2.03 spec
type hardware is a historical artifact like the old DEC Alpha.
I see that in gcc 7.3.0 we do get share/info/libquadmath.info
installed BUT in gcc 8 we do not. This is good.
It is annoying that the gcc compiler will produce the correct
assembly for both the IBM long double and the IEEE 754-2008
type 128-bit floating point. One sort of works and the other
does not at all. A value for pi becomes 2.0713495408... etc.
The gcc manual page for "IBM RS/6000 and PowerPC Options" needs
a bit of a re-write to address the strange results one may get
from the use of "-mabi" ieeelongdouble or ibmlongdouble. At
the very least the "warning" exists to let a user know that
something is amiss here and strange results may occur.
Dennis Clarke
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Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Fri, 20 Apr 2018 10:05:00 -0000
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--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Dennis Clarke from comment #16)
> It is annoying that the gcc compiler will produce the correct
> assembly for both the IBM long double and the IEEE 754-2008
> type 128-bit floating point. One sort of works and the other
I have no idea what you mean by correct assembly for -mabi=ieeelongdouble.
If you try something as simple as
long double add (long double x, long double y) { return x + y; }
you'll see that it emits the SVR4 ABI calls like _q_add etc. for the software
emulation, but neither glibc nor gcc provides implementation for these.
So it doesn't work at all unless you provide your own library. This isn't some
gap that libquadmath can cover, that library requires that {+,-,*,/} etc. work
and furthermore the type needs to be __float128, not long double.
>From gcc-bugs-return-602258-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 10:29:15 2018
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From: "dclarke at blastwave dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Fri, 20 Apr 2018 10:29:00 -0000
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--- Comment #18 from Dennis Clarke <dclarke at blastwave dot org> ---
We are saying the same thing here.
Those same emulation routines exist elsewhere and are called _Qp_div,
_Qp_mul and _Qp_add on Solaris SPARC systems whereas those are
implemented into other places with more or less the same names.
Let's not go in circles here. I see the issue and the old 970 is a
historical artifact.
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Subject: [Bug tree-optimization/85475] [8 Regression] Compile time hog w/ -O1 -fpeel-loops
Date: Fri, 20 Apr 2018 10:31:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug tree-optimization/85475] [8 Regression] Compile time hog w/ -O1 -fpeel-loops
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Apr 20 10:31:23 2018
New Revision: 259519
URL: https://gcc.gnu.org/viewcvs?rev=259519&root=gcc&view=rev
Log:
2018-04-20 Richard Biener <rguenther@suse.de>
PR middle-end/85475
* match.pd ((X * CST) * Y -> (X * Y) * CST): Avoid exponential
complexity by forcing a single use of the multiply operand.
* gcc.dg/torture/pr85475.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr85475.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/match.pd
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/85481] [8 Regression] ICE in maybe_explain_implicit_delete
Date: Fri, 20 Apr 2018 10:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85481
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P4
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-20
CC| |jakub at gcc dot gnu.org,
| |jason at gcc dot gnu.org
Target Milestone|--- |8.0
Summary|ICE in |[8 Regression] ICE in
|maybe_explain_implicit_dele |maybe_explain_implicit_dele
|te |te
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r250994.
>From gcc-bugs-return-602263-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 10:41:52 2018
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Subject: [Bug target/85482] unnecessary vmovaps/vmovapd/vmovdqa emitted
Date: Fri, 20 Apr 2018 10:41:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-04-20
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-602262-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 10:41:17 2018
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Subject: [Bug c++/85481] [8 Regression] ICE in maybe_explain_implicit_delete
Date: Fri, 20 Apr 2018 10:41:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-checking
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The ICE goes away also with -fno-checking.
1872 else if (flag_checking)
1873 gcc_unreachable ();
Wonder if we just don't want else if (flag_checking && (errorcount + sorrycount
== 0))
instead.
>From gcc-bugs-return-602264-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 10:56:15 2018
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Subject: [Bug tree-optimization/85478] ICE with single element vector
Date: Fri, 20 Apr 2018 10:56:00 -0000
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--- Comment #4 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
Indeed it does not appear to fail with a cross from x86. I've checked with
r259518 on s390x as well as on x86. With an x86 cross no tree dump is generated
after 012t.ompexp and the generated assembler file does not contain any code.
x86->s390x cross 012.ompexp:
...
;; Function c::f<ab<float>*, ab<long double>*> (_ZN1c1fIP2abIfEPS1_IeEEEiT_T0_,
funcdef_no=15, decl_uid
=2862, cgraph_uid=9, symbol_order=9)
c::f<ab<float>*, ab<long double>*> (struct ab * g, struct ab * h)
{
struct ab * i;
struct ab D.2925;
<bb 2> :
if (i == g)
goto <bb 4>; [INV]
else
goto <bb 3>; [INV]
<bb 3> :
ab<long double>::ab (&D.2925, MEM[(const struct ab &)i]);
*h = D.2925;
h = h + 16;
i = i + 16;
goto <bb 2>; [INV]
<bb 4> :
__builtin_unreachable ();
}
;; Function ab<long double>::ab (_ZN2abIeEC2ES_IfE, funcdef_no=6,
decl_uid=2666, cgraph_uid=2, symbol_order=2)
ab<long double>::ab (struct ab * const this, struct ab g)
{
complex double D.2939;
<bb 2> :
MEM[(struct &)this] = {CLOBBER};
D.2939 = ab<float>::m (&g);
_1 = REALPART_EXPR <D.2939>;
_2 = IMAGPART_EXPR <D.2939>;
_3 = COMPLEX_EXPR <_1, _2>;
this->n = _3;
return;
}
s390x native 012.ompexp:
;; Function c::f<ab<float>*, ab<long double>*> (_ZN1c1fIP2abIfEPS1_IgEEEiT_T0_,
funcdef_no=15, decl_uid
=2896, cgraph_uid=9, symbol_order=9)
c::f<ab<float>*, ab<long double>*> (struct ab * g, struct ab * h)
{
struct ab * i;
struct ab D.2959;
<bb 2> :
if (i == g)
goto <bb 4>; [INV]
else
goto <bb 3>; [INV]
<bb 3> :
ab<long double>::ab (&D.2959, MEM[(const struct ab &)i]);
*h = D.2959;
D.2959 = {CLOBBER};
h = h + 32;
i = i + 16;
goto <bb 2>; [INV]
<bb 4> :
__builtin_unreachable ();
}
;; Function ab<long double>::ab (_ZN2abIgEC2ES_IfE, funcdef_no=6,
decl_uid=2700, cgraph_uid=2, symbol_order=2)
ab<long double>::ab (struct ab * const this, struct ab g)
{
complex double D.2973;
<bb 2> :
MEM[(struct &)this] = {CLOBBER};
D.2973 = ab<float>::m (&g);
_1 = REALPART_EXPR <D.2973>;
_2 = (long double) _1;
_3 = IMAGPART_EXPR <D.2973>;
_4 = (long double) _3;
_5 = COMPLEX_EXPR <_2, _4>;
this->n = _5;
return;
}
>From gcc-bugs-return-602265-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 10:57:28 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Fri, 20 Apr 2018 10:57:00 -0000
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--- Comment #19 from Dennis Clarke <dclarke at blastwave dot org> ---
status : RESOLVED FIXED <-- seems to not apply.
For the sake of showing how there really is a problem here, we can
neatly compile some trivial code and get bizarre results simply
because the platform would prefer to use the non-standard IBM long
double data type. Any attempt to "add" two long doubles will result
in a call to _q_add which doesn't exist and ld fails.
ppc64$ cat foo.c
#define _XOPEN_SOURCE 600
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <sys/utsname.h>
int main ( int argc, char *argv[] ) {
int j;
struct utsname uname_data;
long double pi = 3.14159265358979323846264338327950288419716939937510L;
long double one = 1.0L;
long double two = 2.0L;
setlocale( LC_MESSAGES, "C" );
if ( uname( &uname_data ) < 0 ) {
fprintf ( stderr,
"WARNING : Could not attain system uname data.\n" );
perror ( "uname" );
} else {
printf (" system name = %s\n", uname_data.sysname );
printf (" node name = %s\n", uname_data.nodename );
printf (" release = %s\n", uname_data.release );
printf (" version = %s\n", uname_data.version );
printf (" machine = %s\n", uname_data.machine );
}
printf ("\n");
/* correct 128 bit big endian hex representation of pi is
* 0x40 00 92 1f b5 44 42 d1 84 69 89 8c c5 17 01 b8 */
printf("\naddr \"pi\" is %p\n", &pi );
printf("\ncontents : " );
for ( j=0; j<sizeof(long double); j++ )
printf("%02x ", ((unsigned char *)&pi)[j] );
printf("\n" );
printf("%+42.38Lf\n", pi );
printf(" +3.1415926535897932384626433832795028841971 <- pi\n" );
printf("\n\naddr \"one\" is %p\n", &one );
printf("\ncontents : " );
for ( j=0; j<sizeof(long double); j++ )
printf("%02x ", ((unsigned char *)&one)[j] );
printf("\n" );
printf("%+42.38Lf\n", one );
printf("\n\naddr \"two\" is %p\n", &two );
printf("\ncontents : " );
for ( j=0; j<sizeof(long double); j++ )
printf("%02x ", ((unsigned char *)&two)[j] );
printf("\n" );
printf("%+42.38Lf\n", two );
return (EXIT_SUCCESS);
}
ppc64$
ppc64$ /usr/local/gcc7/bin/gcc -m64 -std=iso9899:2011 \
> -Wfatal-errors -pedantic-errors -mcpu=970 -mfull-toc \
> -mregnames -mabi=ieeelongdouble -o foo foo.c
gcc: warning: using IEEE extended precision long double
cc1: warning: using IEEE extended precision long double
ppc64$
ppc64$ ./foo
system name = Linux
node name = nix
release = 4.16.2-genunix
version = #1 SMP Wed Apr 18 16:41:48 GMT 2018
machine = ppc64
addr "pi" is 0x7fffe4399650
contents : 40 00 92 1f b5 44 42 d1 84 69 89 8c c5 17 01 b8
+2.07134954084936184770526779175270348787
+3.1415926535897932384626433832795028841971 <- pi
addr "one" is 0x7fffe4399660
contents : 3f ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+1.93750000000000000000000000000000000000
addr "two" is 0x7fffe4399670
contents : 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+2.00000000000000000000000000000000000000
ppc64$
ppc64$
ppc64$ /usr/local/gcc7/bin/gcc -m64 -std=iso9899:2011 \
> -Wfatal-errors -pedantic-errors -mcpu=970 -mfull-toc \
> -mregnames -mabi=ibmlongdouble -o foo foo.c
gcc: warning: using IBM extended precision long double
cc1: warning: using IBM extended precision long double
ppc64$ ./foo
system name = Linux
node name = nix
release = 4.16.2-genunix
version = #1 SMP Wed Apr 18 16:41:48 GMT 2018
machine = ppc64
addr "pi" is 0x7ffff5eef3e0
contents : 40 09 21 fb 54 44 2d 18 3c a1 a6 26 33 14 5c 06
+3.14159265358979323846264338327948122706
+3.1415926535897932384626433832795028841971 <- pi
addr "one" is 0x7ffff5eef3f0
contents : 3f f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+1.00000000000000000000000000000000000000
addr "two" is 0x7ffff5eef400
contents : 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+2.00000000000000000000000000000000000000
ppc64$
Like you say "...it doesn't work at all unless you provide your own library."
So very true.
Well this has been fun and I think a POWER9 server is needed to do
any real work and certainly the hardware support will be fun.
>From gcc-bugs-return-602266-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 11:18:09 2018
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85478] ICE with single element vector
Date: Fri, 20 Apr 2018 11:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85478
--- Comment #5 from rguenther at suse dot de <rguenther at suse dot de> ---
On Fri, 20 Apr 2018, krebbel at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85478
>
> --- Comment #4 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
> Indeed it does not appear to fail with a cross from x86. I've checked with
> r259518 on s390x as well as on x86. With an x86 cross no tree dump is generated
> after 012t.ompexp and the generated assembler file does not contain any code.
I do see generated code for the explicitely instantiated operator.
sth like
void foo(ab<float> *a, ab<long double> *b){ c::f<ab<float> *, ab<long
double> *> (a,b); }
void bar(ab<float> x) { ab<__float128> a(x); }
should instantiate both functions below explicitely but __float128
(taken from the demangling) doesn't do it and using 'long double'
ends up with a different mangling (and code).
That said, cross and native shouldn't differ and tracking down the
reason would be interesting.
>From gcc-bugs-return-602267-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 11:43:27 2018
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Subject: [Bug c++/79736] [5 Regression] Please submit a full bug report: unable to create precompiled headers
Date: Fri, 20 Apr 2018 11:43:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79736
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Known to work| |4.9.4, 6.1.0
Target Milestone|--- |6.0
Summary|Please submit a full bug |[5 Regression] Please
|report: unable to create |submit a full bug report:
|precompiled headers |unable to create
| |precompiled headers
Known to fail| |5.1.0, 5.5.0
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I can reproduce this with gcc 5 but not gcc 6 or later. The preprocessed source
is 800kB even compressed, so I can't attach it.
The ICE started with r221641
PR c++/65498
* pt.c (get_mostly_instantiated_function_type): Just return the
type of the partially instantiated template in DECL_TI_TEMPLATE.
It was fixed by r227846
2015-09-17 Richard Biener
* cp-tree.h (note_decl_for_pch): Remove.
* class.c (build_clone): Do not call note_decl_for_pch.
* semantics.c (finish_member_declaration): Likewise.
(note_decl_for_pch): Remove.
* decl2.c (c_parse_final_cleanups): Mangle all globals before
writing the PCH.
Should we close it as FIXED?
>From gcc-bugs-return-602268-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 11:48:59 2018
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From: "thomas.petazzoni@free-electrons.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/69401] gcc 5.3.0/6.1.0 on microblaze: internal compiler error: in gen_reg_rtx, at emit-rtl.c:1027
Date: Fri, 20 Apr 2018 11:48:00 -0000
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--- Comment #6 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> ---
I see Eric Gallager added bug 68538 in the "See also" section. However, I don't
see how they can be related: 68538 has been fixed, and the fix was only in
CRIS-specific files.
This bug however is only about Microblaze, so I don't see how it can be related
to a bug that was fixed in CRIS-specific code.
>From gcc-bugs-return-602269-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 11:53:08 2018
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Subject: [Bug target/85445] [nvptx, openacc] Calls to worker and vector routine broken
Date: Fri, 20 Apr 2018 11:53:00 -0000
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--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> og7 test-case ref-1.C fails in execution when run with trunk:
At -O2, due to the call to routine Worker. The Vector routine is inlined, due
to missing noinline,noclone attributes.
> #pragma acc routine worker
> void Worker (int *ptr, int m, int n, const int &inc)
> {
> #pragma acc loop worker
> for (unsigned ix = 0; ix < m; ix++)
> Vector(ptr + ix * n, n, inc);
> }
>
> int main ()
> {
> #pragma acc parallel copy(ary)
> {
> Worker (&ary[0][0], m, n, 1<<16);
> }
The inc parameter is a reference parameter, so the argument 1<<16 (65536) is
saved on stack:
...
mov.u32 %r25, 65536;
st.u32 [%frame], %r25;
...
and the address is passed as argument:
...
.param.u64 %out_arg4;
st.param.u64 [%out_arg4], %frame;
call _Z6WorkerPiiiRKi, (%out_arg1, %out_arg2, %out_arg3,
%out_arg4);
...
The stack is declared with .local:
...
.local .align 16 .b8 %frame_ar[16];
.reg.u64 %frame;
cvta.local.u64 %frame, %frame_ar;
...
which means:
...
Local memory, private to each thread.
...
The initialization of the stack is done in thread W0V0, but the stack is read
in WAVA mode, so it's reading uninitialized stack memory in all but the W0V0
thread.
>From gcc-bugs-return-602270-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 11:57:23 2018
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Subject: [Bug target/85445] [nvptx, openacc] Calls to worker and vector routine broken
Date: Fri, 20 Apr 2018 11:57:00 -0000
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--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #1)
> The initialization of the stack is done in thread W0V0, but the stack is
> read in WAVA mode, so it's reading uninitialized stack memory in all but
> the W0V0 thread.
r239736 fixes this by propating the stack frame from W0V0 to WAVO:
...
$ diff -u bad.s ok.s
--- bad.s 2018-04-20 09:36:51.122581511 +0200
+++ ok.s 2018-04-20 09:53:01.971786471 +0200
@@ -344,28 +344,66 @@
.reg.u32 %r25;
.reg.u64 %r26;
.reg.u32 %r28;
- .reg.pred %r30;
- .reg.pred %r31;
+ .reg.u64 %r30;
+ .reg.u64 %r31;
+ .reg.u64 %r32;
+ .reg.u32 %r33;
+ .reg.pred %r34;
+ .reg.u64 %r35;
+ .reg.u64 %r36;
+ .reg.u64 %r37;
+ .reg.u64 %r38;
+ .reg.u32 %r39;
+ .reg.pred %r40;
+ .reg.u64 %r41;
+ .reg.pred %r42;
+ .reg.pred %r43;
{
.reg.u32 %y;
mov.u32 %y, %tid.y;
- setp.ne.u32 %r30, %y, 0;
+ setp.ne.u32 %r42, %y, 0;
}
{
.reg.u32 %x;
mov.u32 %x, %tid.x;
- setp.ne.u32 %r31, %x, 0;
+ setp.ne.u32 %r43, %x, 0;
}
- @%r30 bra.uni $L30;
- @%r31 bra $L31;
+ @%r42 bra.uni $L32;
+ @%r43 bra $L33;
mov.u64 %r24, %ar0;
mov.u32 %r25, 65536;
st.u32 [%frame], %r25;
mov.u32 %r28, 32;
ld.u64 %r26, [%r24];
+ // fork 14;
+ cvta.shared.u64 %r36, __worker_bcast;
+ mov.u64 %r38, %frame;
+ mov.u32 %r39, 2;
+ add.u64 %r41, %r36, 0;
$L31:
-$L30:
+ add.u32 %r39, %r39, -1;
+ ld.u64 %r37, [%r38];
+ st.u64 [%r41], %r37;
+ add.u64 %r41, %r41, 8;
+ setp.ne.u32 %r40, %r39, 0;
+ add.u64 %r38, %r38, 8;
+ @%r40 bra.uni $L31;
+$L33:
+$L32:
+ bar.sync 0;
// forked 14;
+ cvta.shared.u64 %r30, __worker_bcast;
+ mov.u64 %r32, %frame;
+ mov.u32 %r33, 2;
+ add.u64 %r35, %r30, 0;
+$L30:
+ add.u32 %r33, %r33, -1;
+ ld.u64 %r31, [%r35];
+ add.u64 %r35, %r35, 8;
+ st.u64 [%r32], %r31;
+ setp.ne.u32 %r34, %r33, 0;
+ add.u64 %r32, %r32, 8;
+ @%r34 bra.uni $L30;
{
.param.u64 %out_arg1;
st.param.u64 [%out_arg1], %r26;
@@ -377,6 +415,8 @@
st.param.u64 [%out_arg4], %frame;
call _Z6WorkerPiiiRKi, (%out_arg1, %out_arg2, %out_arg3,
%out_arg4);
}
+ // joining 14;
+ bar.sync 1;
// join 14;
ret;
}
...
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Subject: [Bug target/83969] [8 Regression] ICE in final_scan_insn, at final.c:2997 (error: could not split insn) for powerpc targets
Date: Fri, 20 Apr 2018 12:20:00 -0000
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--- Comment #15 from Peter Bergner <bergner at gcc dot gnu.org> ---
Author: bergner
Date: Fri Apr 20 12:19:10 2018
New Revision: 259520
URL: https://gcc.gnu.org/viewcvs?rev=259520&root=gcc&view=rev
Log:
gcc/
Backport from mainline
2018-03-09 Peter Bergner <bergner@vnet.ibm.com>
PR target/83969
* config/rs6000/rs6000.c (rs6000_offsettable_memref_p): New prototype.
Add strict argument and use it.
(rs6000_split_multireg_move): Update for new strict argument.
(mem_operand_gpr): Disallow all non-offsettable addresses.
* config/rs6000/rs6000.md (*movdi_internal64): Use YZ constraint.
gcc/testsuite/
PR target/85436
* go.dg/pr85436.go: New test.
Backport from mainline
2018-03-09 Peter Bergner <bergner@vnet.ibm.com>
PR target/83969
* gcc.target/powerpc/pr83969.c: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.target/powerpc/pr83969.c
branches/gcc-7-branch/gcc/testsuite/go.dg/pr85436.go
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/rs6000/rs6000.c
branches/gcc-7-branch/gcc/config/rs6000/rs6000.md
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug target/85436] [7 Regression] ICE compiling go code with -mcpu=power9
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--- Comment #4 from Peter Bergner <bergner at gcc dot gnu.org> ---
Author: bergner
Date: Fri Apr 20 12:19:10 2018
New Revision: 259520
URL: https://gcc.gnu.org/viewcvs?rev=259520&root=gcc&view=rev
Log:
gcc/
Backport from mainline
2018-03-09 Peter Bergner <bergner@vnet.ibm.com>
PR target/83969
* config/rs6000/rs6000.c (rs6000_offsettable_memref_p): New prototype.
Add strict argument and use it.
(rs6000_split_multireg_move): Update for new strict argument.
(mem_operand_gpr): Disallow all non-offsettable addresses.
* config/rs6000/rs6000.md (*movdi_internal64): Use YZ constraint.
gcc/testsuite/
PR target/85436
* go.dg/pr85436.go: New test.
Backport from mainline
2018-03-09 Peter Bergner <bergner@vnet.ibm.com>
PR target/83969
* gcc.target/powerpc/pr83969.c: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.target/powerpc/pr83969.c
branches/gcc-7-branch/gcc/testsuite/go.dg/pr85436.go
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/rs6000/rs6000.c
branches/gcc-7-branch/gcc/config/rs6000/rs6000.md
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Fri Apr 20 12:55:36 2018
New Revision: 259521
URL: https://gcc.gnu.org/viewcvs?rev=259521&root=gcc&view=rev
Log:
Do not overflow string buffer (PR objc/85476).
2018-04-20 Martin Liska <mliska@suse.cz>
PR objc/85476
* objc-act.c (finish_class): Do not overflow string buffer.
Modified:
trunk/gcc/objc/ChangeLog
trunk/gcc/objc/objc-act.c
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Subject: [Bug ipa/85449] [8 Regression] Wrong specialization is called in self recursive functions after r259319
Date: Fri, 20 Apr 2018 13:01:00 -0000
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--- Comment #13 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Thanks Martin!
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug objc/85476] ASAN error in finish_class ../../gcc/objc/objc-act.c:8006
Date: Fri, 20 Apr 2018 13:22:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed on trunk.
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From: "hjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85469] -mibt is unused
Date: Fri, 20 Apr 2018 13:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85469
--- Comment #1 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Fri Apr 20 13:30:13 2018
New Revision: 259522
URL: https://gcc.gnu.org/viewcvs?rev=259522&root=gcc&view=rev
Log:
Define __CET__ for -fcf-protection and remove -mibt
With revision 259496:
commit b1384095a7c1d06a44b70853372ebe037b2f7867
Author: hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu Apr 19 15:15:04 2018 +0000
x86: Enable -fcf-protection with multi-byte NOPs
-mibt does nothing and can be removed. Define __CET__ to indicate level
protection with -fcf-protection:
(__CET__ & 1) != 0: -fcf-protection=branch or -fcf-protection=full
(__CET__ & 2) != 0: -fcf-protection=return or -fcf-protection=full
gcc/
PR target/85469
* common/config/i386/i386-common.c (OPTION_MASK_ISA_IBT_SET):
Removed.
(OPTION_MASK_ISA_IBT_UNSET): Likewise.
(ix86_handle_option): Don't handle OPT_mibt.
* config/i386/cet.h: Check __CET__ instead of __IBT__ and
__SHSTK__.
* config/i386/driver-i386.c (host_detect_local_cpu): Remove
has_ibt and ibt.
* config/i386/i386-c.c (ix86_target_macros_internal): Don't
check OPTION_MASK_ISA_IBT nor flag_cf_protection.
(ix86_target_macros): Define __CET__ with flag_cf_protection
for -fcf-protection.
* config/i386/i386.c (isa2_opts): Remove -mibt.
* config/i386/i386.h (TARGET_IBT): Removed.
(TARGET_IBT_P): Likewise.
(ix86_valid_target_attribute_inner_p): Don't check OPT_mibt.
* config/i386/i386.md (nop_endbr): Don't check TARGET_IBT.
* config/i386/i386.opt (mcet): Update help message.
(mshstk): Likewise.
(mibt): Removed.
* doc/invoke.texi: Remove -mibt. Document __CET__. Document
-mcet as an alias for -mshstk.
gcc/testsuite/
PR target/85469
* gcc.target/i386/pr85044.c (dg-options): Remove -mibt.
* gcc.target/i386/sse-26.c (dg-options): Remove -mno-ibt.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/common/config/i386/i386-common.c
trunk/gcc/config/i386/cet.h
trunk/gcc/config/i386/driver-i386.c
trunk/gcc/config/i386/i386-c.c
trunk/gcc/config/i386/i386.c
trunk/gcc/config/i386/i386.h
trunk/gcc/config/i386/i386.md
trunk/gcc/config/i386/i386.opt
trunk/gcc/doc/invoke.texi
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/i386/pr85044.c
trunk/gcc/testsuite/gcc.target/i386/sse-26.c
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Subject: [Bug target/85469] -mibt is unused
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H.J. Lu <hjl.tools at gmail dot com> changed:
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--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 8.
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Subject: [Bug target/81652] [meta-bug] -fcf-protection=full -mcet bugs
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Bug 81652 depends on bug 85469, which changed state.
Bug 85469 Summary: -mibt is unused
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85469
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Subject: [Bug target/85436] [7 Regression] ICE compiling go code with -mcpu=power9
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Peter Bergner <bergner at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Peter Bergner <bergner at gcc dot gnu.org> ---
Fixed in GCC 7.
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Subject: [Bug target/85445] [nvptx, openacc] Calls to worker and vector routine broken
Date: Fri, 20 Apr 2018 13:46:00 -0000
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--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Author: vries
Date: Fri Apr 20 13:46:07 2018
New Revision: 259523
URL: https://gcc.gnu.org/viewcvs?rev=259523&root=gcc&view=rev
Log:
[nvptx] Fix calls to vector and worker routines
2018-04-20 Nathan Sidwell <nathan@codesourcery.com>
Tom de Vries <tom@codesourcery.com>
PR target/85445
* config/nvptx/nvptx.c (nvptx_emit_forking, nvptx_emit_joining):
Emit insns for calls too.
(nvptx_find_par): Always look for worker-level predecessor insn.
(nvptx_propagate): Add is_call parm, return bool. Copy frame for
calls.
(nvptx_vpropagate, nvptx_wpropagate): Adjust.
(nvptx_process_pars): Propagate frames for calls.
* testsuite/libgomp.oacc-c++/ref-1.C: New.
Added:
trunk/libgomp/testsuite/libgomp.oacc-c++/ref-1.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/nvptx/nvptx.c
trunk/libgomp/ChangeLog
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Subject: [Bug c++/84588] [8 Regression] internal compiler error: Segmentation fault (contains_struct_check())
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC|paolo.carlini at oracle dot com, |
|vegard.nossum at gmail dot com |
Assignee|unassigned at gcc dot gnu.org |paolo.carlini at oracle dot com
--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Mine.
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Subject: [Bug target/85445] [nvptx, openacc] Calls to worker and vector routine broken
Date: Fri, 20 Apr 2018 14:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85445
Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |8.0
--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
Patch with test-case committed, marking resolved-fixed.
>From gcc-bugs-return-602283-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 15:19:03 2018
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Subject: [Bug target/83402] PPC64 implementation of ./rs6000/emmintrin.h gives out of range for _mm_slli_epi32
Date: Fri, 20 Apr 2018 15:19:00 -0000
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--- Comment #13 from Carl Love <carll at gcc dot gnu.org> ---
Author: carll
Date: Fri Apr 20 15:18:24 2018
New Revision: 259524
URL: https://gcc.gnu.org/viewcvs?rev=259524&root=gcc&view=rev
Log:
gcc/ChangeLog:
2018-04-20 Carl Love <cel@us.ibm.com>
PR target/83402
* config/rs6000/rs6000-c.c (rs6000_gimple_fold_builtin): Add
size check for arg0.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/rs6000.c
>From gcc-bugs-return-602284-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 15:32:13 2018
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Subject: [Bug target/83402] PPC64 implementation of ./rs6000/emmintrin.h gives out of range for _mm_slli_epi32
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Carl Love <carll at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |carll at gcc dot gnu.org
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--- Comment #14 from Carl Love <carll at gcc dot gnu.org> ---
Marking this issue fixed, resolved, see comment 13.
>From gcc-bugs-return-602285-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 15:35:19 2018
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From: "sje at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85483] New: Many failures on test gcc.target/aarch64/sve/vcond_1.c
Date: Fri, 20 Apr 2018 15:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85483
Bug ID: 85483
Summary: Many failures on test gcc.target/aarch64/sve/vcond_1.c
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: sje at gcc dot gnu.org
Target Milestone: ---
I am seeing a bunch of failures in the gcc.target/aarch64/sve/vcond_1.c
test on aarch64. You can see them on the test results list at:
https://gcc.gnu.org/ml/gcc-testresults/2018-04/msg01710.html
They seem to have showed up in the last 24 hours, but I am not sure
exactly what patch caused them.
>From gcc-bugs-return-602286-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 15:49:01 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85484] New: missing -Wstringop-overflow for strcpy with a string of non-const length
Date: Fri, 20 Apr 2018 15:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85484
Bug ID: 85484
Summary: missing -Wstringop-overflow for strcpy with a string
of non-const length
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
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The buffer overflow reported in bug 85476 can be reduced to the test case
below. The overflow is quite obvious and should be easy to detect at
compile-time via the -Wstringop-overflow warning yet GCC does not detect it,
either with or without -D_FORTIFY_SOURCE. That's because __builtin_object_size
that -Wstringop-overflow relies on only deals with constant sizes. But the
non-constant string length and allocation size are both readily available in
the tree-ssa-strlen pass and so the bug can easily be detected there.
$ cat x.c && gcc -O2 -S -Wall -Wextra -Wpedantic -fdump-tree-strlen=/dev/stdout
x.c
void f (char*);
void g (const char *s)
{
unsigned n = __builtin_strlen (s);
char *d = __builtin_alloca (n); // off-by-one error (should be n + 1)
__builtin_strcpy (d, s); // missing -Wstringop-overflow
f (d);
}
void h (const char *s)
{
unsigned n = __builtin_strlen (s);
char *d = __builtin_alloca (n);
__builtin___strcpy_chk (d, s, __builtin_object_size (d, 1));
f (d);
}
;; Function g (g, funcdef_no=0, decl_uid=1960, cgraph_uid=0, symbol_order=0)
g (const char * s)
{
char * d;
long unsigned int _1;
long unsigned int _8;
long unsigned int _10;
<bb 2> [local count: 1073741825]:
_1 = __builtin_strlen (s_3(D));
_8 = _1 & 4294967295;
d_5 = __builtin_alloca (_8);
_10 = _1 + 1;
__builtin_memcpy (d_5, s_3(D), _10);
f (d_5);
return;
}
;; Function h (h, funcdef_no=1, decl_uid=1965, cgraph_uid=1, symbol_order=1)
h (const char * s)
{
char * d;
long unsigned int _1;
long unsigned int _2;
long unsigned int _9;
<bb 2> [local count: 1073741825]:
_1 = __builtin_strlen (s_4(D));
_9 = _1 & 4294967295;
d_6 = __builtin_alloca (_9);
_2 = _1 + 1;
__builtin_memcpy (d_6, s_4(D), _2);
f (d_6);
return;
}
>From gcc-bugs-return-602287-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 15:54:40 2018
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/85361] Variable length array allowed in c89/90
Date: Fri, 20 Apr 2018 15:54:00 -0000
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--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
See the documentation of -std=, regarding base standards.
# The compiler can accept several base standards, such as @samp{c90} or
# @samp{c++98}, and GNU dialects of those standards, such as
# @samp{gnu90} or @samp{gnu++98}. When a base standard is specified, the
# compiler accepts all programs following that standard plus those
# using GNU extensions that do not contradict it. For example,
# @option{-std=c90} turns off certain features of GCC that are
# incompatible with ISO C90, such as the @code{asm} and @code{typeof}
# keywords, but not other GNU extensions that do not have a meaning in
# ISO C90, such as omitting the middle term of a @code{?:}
# expression. On the other hand, when a GNU dialect of a standard is
# specified, all features supported by the compiler are enabled, even when
# those features change the meaning of the base standard. As a result, some
# strict-conforming programs may be rejected. The particular standard
# is used by @option{-Wpedantic} to identify which features are GNU
# extensions given that version of the standard. For example
# @option{-std=gnu90 -Wpedantic} warns about C++ style @samp{//}
# comments, while @option{-std=gnu99 -Wpedantic} does not.
>From gcc-bugs-return-602288-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 15:56:31 2018
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From: "nathan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/85437] [8 Regression] member pointer static upcast rejected in a constexpr context
Date: Fri, 20 Apr 2018 15:56:00 -0000
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
>From gcc-bugs-return-602289-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 16:00:56 2018
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Subject: [Bug tree-optimization/85483] Many failures on test gcc.target/aarch64/sve/vcond_1.c
Date: Fri, 20 Apr 2018 16:00:00 -0000
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--- Comment #1 from ktkachov at gcc dot gnu.org ---
That would be due to r259437.
vcond_1.c needs to be a C++ test rather than a C one.
It should be moved into g++.dg/other/
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Subject: [Bug testsuite/85483] Many failures on test gcc.target/aarch64/sve/vcond_1.c
Date: Fri, 20 Apr 2018 16:12:00 -0000
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ktkachov at gcc dot gnu.org changed:
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Subject: [Bug testsuite/85483] Many failures on test gcc.target/aarch64/sve/vcond_1.c
Date: Fri, 20 Apr 2018 16:31:00 -0000
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--- Comment #2 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Fri Apr 20 16:31:19 2018
New Revision: 259526
URL: https://gcc.gnu.org/viewcvs?rev=259526&root=gcc&view=rev
Log:
PR testsuite/85483: Move aarch64/sve/vcond_1.c test to g++.dg/other/
I totally botched up this sve test file in 259437.
It needs C++, so move it to g++.dg/other and make it a .C file.
Also adds the target guards to prevent it from running on non-aarch64 targets.
Tested that it passes on aarch64-none-elf and doesn't get run on arm-none-eabi.
Committing to trunk as obvious.
PR testsuite/85483
* gcc.target/aarch64/sve/vcond_1.c: Move to...
* g++.dg/other/sve_vcond_1.C: ... Here. Add target directives.
* gcc.target/aarch64/sve/vcond_1_run.c: Move to...
* g++.dg/other/sve_vcond_1_run.C: ... Here. Change include file name.
Added:
trunk/gcc/testsuite/g++.dg/other/sve_vcond_1.C
trunk/gcc/testsuite/g++.dg/other/sve_vcond_1_run.C
Removed:
trunk/gcc/testsuite/gcc.target/aarch64/sve/vcond_1.c
trunk/gcc/testsuite/gcc.target/aarch64/sve/vcond_1_run.c
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/85473] internal compiler error: in emit_move_insn, at expr.c:3722
Date: Fri, 20 Apr 2018 16:39:00 -0000
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--- Comment #3 from Sebastian Peryt <sebastian.peryt at intel dot com> ---
Proposed patch sent to ML:
https://gcc.gnu.org/ml/gcc-patches/2018-04/msg01011.html
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Subject: [Bug tree-optimization/85478] ICE with single element vector
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--- Comment #6 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
The difference I have seen so far was triggered by building the cross with
"--without-headers". As a result the detected glibc version is 0.0:
config.log:
configure:28145: checking for target glibc version
configure:28169: result: 0.0
This in turn fails to set the proper default for the long double data type in
configure:
if test $glibc_version_major -gt 2 \
|| ( test $glibc_version_major -eq 2 && test $glibc_version_minor -ge 4 );
then :
gcc_cv_target_ldbl128=yes
else
...
configuring the cross --with-long-double-128 makes the first set of differences
to disappear. However, the testcase still doesn't ICE when compiled with the
cross.
I will retry with a full cross. There appear to be more settings depending on
the Glibc version.
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
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--- Comment #34 from Martin Sebor <msebor at gcc dot gnu.org> ---
The questions in N2223 and the other documents are there to provide background
and justification for the proposed changes (the questions come surveys they
sent to various forums). The proposed words are at the end of each of the
papers referenced from N2223. I don't have the sense that N2223 covers this
case but it's closely related.
Memcpy and memmove transfer the effective type only to objects with no declared
type (i.e., allocated objects):
int i = 123;
void *p = malloc (sizeof i);
memcpy (p, &i, sizeof i); // *p's effective type is now int
This standard mentions just memcpy, memmove, and copies via a character type,
so other mechanisms do not transfer the effective type. (The effective type of
other (typed) storage is that of its declared type.) Memory is only allowed to
be accessed via an lvalue compatible with its effective type (or char), so
above, what's at p can only accessed as *(int*)p.
I think in the use case below:
struct { int i; char buf[4]; } s, r;
*(float *)s.buf = 1.;
r = s;
the aggregate copy has to be viewed as a recursive copy of each of its members
and copying buf[4] must be viewed as a memcpy, Char is definitely special (it
can accesses anything with impunity, even indeterminate values). That said, I
don't think the rules allow char arrays to be treated as allocated storage so
while the store to s.buf via float* may be valid it doesn't change the
effective type of s.buf and so the only way to read the float value stored in
it is to copy it byte-by-byte (i.e., copy the float representation) to an
object whose effective type is float. Some of the papers that deal with the
effective type rules might touch on this (e.g., DR 236, Clark's N1520
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From: "linux at carewolf dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/85406] Unnecessary blend when vectorizing short-cutted calculations
Date: Fri, 20 Apr 2018 17:09:00 -0000
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--- Comment #6 from Allan Jensen <linux at carewolf dot com> ---
Yeah, the a==255 was actually not a case I would expect the compiler to solve,
which is why I changed the example to the a==0 case, which should be solveable
using existing constant propagation.
Note you can put both short-cuts in, though as it standards only gcc 7 and 8
can vectorize it with two conditions, so we cant use that in general code as we
need it to be fast elsewhere too.
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Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
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--- Comment #35 from Martin Sebor <msebor at gcc dot gnu.org> ---
Here are the proposed changes:
Pointer Provenance:
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2219.htm#proposed-technical-corrigendum
Trap Representations:
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2220.htm#proposed-technical-corrigendum
Unspecified Values:
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2221.htm#proposed-technical-corrigendum
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Subject: [Bug target/85381] [og7, nvptx, openacc] parallel-loop-1.c fails with default vector length 128
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #43992|0 |1
is obsolete| |
--- Comment #9 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 43999
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43999&action=edit
Tentative patch inserting dummy instructions
(In reply to Tom de Vries from comment #7)
> We may wanna insert dummy ops inbetween (it would be nice if something less
> heavy than a membar.cta will work).
This patch implements this approach. I've reported the bug at nvidia and see if
they come up with a better or more restricted workaround.
>From gcc-bugs-return-602298-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 18:28:18 2018
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From: "francois.jacq at irsn dot fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/85448] Report binding label clash with a global identifyer
Date: Fri, 20 Apr 2018 18:28:00 -0000
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--- Comment #8 from francois.jacq at irsn dot fr ---
(In reply to Thomas Koenig from comment #7)
> As quoted by Steve Lionel on c.l.f (F2008, 16.2, para 2):
>
> "The global identifier of an entity shall not be the same as the global
> identifier of any other entity. Furthermore, a
> binding label shall not be the same as the global identifier of any other
> global entity, ignoring differences in case."
>
> So, the code is invalid. Since this is not a constraint, the compiler
> can do anything it pleases.
>
> It would be nice to have an error message, though; should be straightforward
> to implement.
Unfortunately, if you look into the comment #2, you will understand that the
situation is a little bit more subtile.
>From gcc-bugs-return-602299-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 18:31:37 2018
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Subject: [Bug rtl-optimization/79985] ICE in code_motion_path_driver, at sel-sched.c:6580
Date: Fri, 20 Apr 2018 18:31:00 -0000
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--- Comment #7 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Or rather like this:
diff --git a/gcc/df-scan.c b/gcc/df-scan.c
index 95e1e0df2d5..732705c0385 100644
--- a/gcc/df-scan.c
+++ b/gcc/df-scan.c
@@ -3207,11 +3207,11 @@ df_insn_refs_collect (struct df_collection_rec
*collection_rec,
if (CALL_P (insn_info->insn))
df_get_call_refs (collection_rec, bb, insn_info, flags);
- if (asm_noperands (PATTERN (insn_info->insn)) >= 0)
+ if (GET_CODE (PATTERN (insn_info->insn)) == ASM_INPUT)
for (unsigned i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (global_regs[i])
{
- /* As with calls, asm statements reference all global regs. */
+ /* As with calls, basic asms reference all global regs. */
df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i],
NULL, bb, insn_info, DF_REF_REG_USE, flags);
df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i],
>From gcc-bugs-return-602300-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 19:23:46 2018
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From: "meissner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/85440] libquadmath and quadmath.h do not exist on ppc64
Date: Fri, 20 Apr 2018 19:23:00 -0000
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--- Comment #20 from Michael Meissner <meissner at gcc dot gnu.org> ---
I'm sorry long double doesn't seem to work on your system. If your system does
not have the appropriate long double libraries, you probably need to use the
--with-long-double-64 option to make long double use the double type. Or you
(or somebody else using the system) need to submit patches, so the compiler
calls whatever is the names of the long double emulation on your system.
With the current compiler, as has been stated, we cannot build libquadmath
unless __float128 is supported. Right now, the only support is for the
following systems:
1) Little endian power8/9 systems
2) Big endian power7/8/9 systems where you use the --with-cpu=<xxx> option,
where <xxx> is power7, power8, or power9.
There just isn't support for a IEEE 128-bit floating point type, unless you
have the VSX (vector scalar extensions) that were first introduced in power7.
The __gcc_q{add,sub,mul,div} come from the libgcc/config/rs6000/ibm-ldouble.c
file. Perhaps it is not configured for your system.
>From gcc-bugs-return-602301-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 19:35:46 2018
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Subject: [Bug libstdc++/66689] comp_ellint_3 and ellint_3 return garbage values
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emsr at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #7 from emsr at gcc dot gnu.org ---
We fixed this back in 1017-11-18.
>From gcc-bugs-return-602302-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 19:44:31 2018
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Subject: [Bug libstdc++/68397] std::tr1::expint fails in __expint_En_cont_frac for some long double arguments due to low __max_iter value
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emsr at gcc dot gnu.org changed:
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--- Comment #4 from emsr at gcc dot gnu.org ---
We fixed this forever ago.
>From gcc-bugs-return-602303-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 20:05:41 2018
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Subject: [Bug libstdc++/68397] std::tr1::expint fails in __expint_En_cont_frac for some long double arguments due to low __max_iter value
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--- Comment #5 from emsr at gcc dot gnu.org ---
We fixed this a long time ago.
>From gcc-bugs-return-602304-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 20:27:23 2018
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From: "TonyELewis at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/65923] False positive for warning about literal operator suffix and using
Date: Fri, 20 Apr 2018 20:27:00 -0000
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--- Comment #9 from Tony E Lewis <TonyELewis at hotmail dot com> ---
I'm so delighted to see:
#include <chrono>
#include <string>
using std::literals::chrono_literals::operator""s;
using std::literals::string_literals::operator""s;
...compiling cleaning on Godbolt.
Thanks for this Ville.
>From gcc-bugs-return-602305-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 20:53:10 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/81837] Internal compiler error (cp/typeck2.c:1264)
Date: Fri, 20 Apr 2018 20:53:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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CC| |egallager at gcc dot gnu.org
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--- Comment #7 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Vegard Nossum from comment #5)
> This looks like it has been fixed, maybe somebody can confirm and change
> status.
Output is now:
$ /usr/local/bin/g++ -c -std=c++14 -g -Wall -Wextra 81837.cc
81837.cc: In function 'int main()':
81837.cc:18:42: error: name 'align' used in a GNU-style designated initializer
for an array
chunk = new Unit <int> [10] {.align = 0};
^
81837.cc:18:42: error: could not convert '0' from 'int' to 'Unit<int>'
$
So confirmed that there's no more ICE. I think the 2 remaining errors are
different enough so as not to need to be de-duplicated, but feel free to open a
new bug if you think there should only be one.
>From gcc-bugs-return-602306-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 20 20:59:39 2018
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Subject: [Bug bootstrap/54696] Makefile doesn't propagate CPPFLAGS to host libraries
Date: Fri, 20 Apr 2018 20:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54696
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC|egall at gwmail dot gwu.edu |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=78251
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
semi-related: bug 78251
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/81837] Internal compiler error (cp/typeck2.c:1264)
Date: Fri, 20 Apr 2018 21:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81837
Paolo Carlini <paolo.carlini at oracle dot com> changed:
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Target Milestone|--- |8.0
--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> ---
In any case, please always set the Target Milestone when closing a bug.
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From: Celina Clarke <celina.clarke@inforesearchsolutions.com>
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Subject: SAP NetWeaver Users list
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Hello there,
I would like to know if you are interested in acquiring SAP NetWeaver Users list.
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Demand Generation Manager
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2018-04-13 12:03 ` [Bug rtl-optimization/85393] [8 Regression] Miscompilation with hot/cold partitioning starting with r254832 jakub at gcc dot gnu.org
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