* [Bug c/83584] "ISO C forbids conversion of object pointer to function pointer type" -- no, not really
[not found] <bug-83584-4@http.gcc.gnu.org/bugzilla/>
@ 2018-01-01 0:15 ` joseph at codesourcery dot com
2022-01-12 19:22 ` pavel.morozkin at gmail dot com
2024-03-28 22:51 ` kkylheku at gmail dot com
2 siblings, 0 replies; 3+ messages in thread
From: joseph at codesourcery dot com @ 2018-01-01 0:15 UTC (permalink / raw)
To: gcc-bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83584
--- Comment #17 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
There are certainly cases where something that is undefined at compile
time in ISO C (i.e. the undefinedness is a property of the program, not of
a particular execution path through the program) are unconditional hard
errors - when GCC does not have any support for defining any semantics for
the undefined construct.
Since it's OK for such things to be unconditional hard errors, it's also
OK for them to be unconditional pedwarns (subject to the general principle
of not really wanting a warning without an option to turn it off - but at
least, on-by-default pedwarns are OK). And it's also OK for them to be
pedwarns-if-pedantic. But the wording should be improved (e.g. "does not
permit" or "does not support" instead of "forbids"), and there may be a
case for a separate option that could turn this diagnostic off when used
with -pedantic / -pedantic-errors.
>From gcc-bugs-return-587051-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 00:16:32 2018
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/83585] [8 Regression] Assembler messages: Error: can't resolve `.text' {.text section} - `.LCOLDB0' {.text.unlikely section}
Date: Mon, 01 Jan 2018 00:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83585
--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
return without a value in non-void functions is valid in C90 (only
undefined at runtime if the return value is used by the caller). C99 made
it a constraint violation.
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From: "mpezz at tiscali dot it" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/83566] cyl_bessel_j returns wrong result for x>1000 for high orders.
Date: Mon, 01 Jan 2018 02:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83566
Michele Pezzutti <mpezz at tiscali dot it> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mpezz at tiscali dot it
--- Comment #2 from Michele Pezzutti <mpezz at tiscali dot it> ---
Series expansion in __cyl_bessel_jn_asymp() shall not be truncated at the first
terms. At least nu/2 terms shall be added, in order to have a guaranteed error
bound.
Patch proposed to mailing list.
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Subject: [Bug c++/83644] New: ICE using type alias from recursive decltype in noexcept or return type
Date: Mon, 01 Jan 2018 09:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83644
Bug ID: 83644
Summary: ICE using type alias from recursive decltype in
noexcept or return type
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gccbugbjorn at fahller dot se
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Created attachment 42996
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42996&action=edit
Source of failing program
The program (attached, and on https://godbolt.org/g/N6nHKk) ICEs as follows:
bf@rahonavis /tmp> g++ -std=c++17 t.cpp
t.cpp: In instantiation of 'compose(F&&, Fs&& ...)::<lambda(auto:1&& ...)>
[with auto:1 = {int}; F = f()::<lambda(auto:2)>; Fs =
{f()::<lambda(auto:3)>}]':
t.cpp:32:72: required from here
t.cpp:20:39: internal compiler error: Segmentation fault
using tail_type = decltype(compose(std::forward<Fs>(fs)...));
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.
To make it not fail, use the macro instead of the type alias, or comment out
both the trailing return type and the noexcept.
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Subject: [Bug c++/83644] ICE using type alias from recursive decltype in noexcept or return type
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--- Comment #1 from Björn Fahller <gccbugbjorn at fahller dot se> ---
Created attachment 42997
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42997&action=edit
Preprocessed source
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From: "ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/81968] [8 regression] early lto debug objects make Solaris ld SEGV
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--- Comment #37 from Rainer Orth <ro at gcc dot gnu.org> ---
Created attachment 42998
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Merged patches for PRs pr81968 and 83452
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From: "ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/81968] [8 regression] early lto debug objects make Solaris ld SEGV
Date: Mon, 01 Jan 2018 10:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81968
--- Comment #38 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
>> --- Comment #33 from rguenther at suse dot de <rguenther at suse dot de> ---
> [...]
>>>* Invalid sh_info:
>>>
>>>FAIL: g++.dg/lto/pr42987 cp_lto_pr42987_0.o-cp_lto_pr42987_1.o link,
>>>-flto
>>>-flto-partition=none -g
>>>FAIL: g++.dg/lto/pr42987 cp_lto_pr42987_0.o-cp_lto_pr42987_1.o link,
>>>-flto -g
>>>
>>>ld: fatal: file /var/tmp//ccXwdzGddebugobjtem: section
>>>[6].rel.gnu.debuglto_.debug_info: has invalid sh_info: 9
>>>ld: fatal: file /var/tmp//ccuVJOVbdebugobjtem: section
>>>[6].rel.gnu.debuglto_.debug_info: has invalid sh_info: 8
>>>
>>> seen during the ld -r -o ccrIZb_ddebugobj ccSerOuddebugobjtem
>>> cc5b3Arcdebugobjtem step:
>>>
>>>ccSerOuddebugobjtem: .rel.gnu.debuglto_.debug_info: sh_info: 9: does
>>>not point
>>>to a valid section
>>>
>>>Section Header[6]: sh_name: .rel.gnu.debuglto_.debug_info
>>> sh_addr: 0 sh_flags: 0
>>> sh_size: 0x8 sh_type: [ SHT_REL ]
>>> sh_offset: 0x11c8 sh_entsize: 0x8 (1 entry)
>>> sh_link: 5 sh_info: 9
>>> sh_addralign: 0x4
>>>
>>> But there's no section 9 any longer.
>>
>> I fixed that in the posted patch for the hpux issue(s).
>
> Good: I'll try to merge the two after the christmas holidays.
I've used the attached patch, with mixed results:
* No changes on SPARC (which wasn't affected by this issue in the first
place).
* On x86, of the previous 32 ld: fatal: has invalid sh_info errors, 16
are now gone.
However, I've many (1284 in g++.log) instances of
ld: warning: symbol .symtab[2] has invalid section index; ignored:
(file /var/tmp//ccyttLYbdebugobjtem value=9);
Those links end with
ld: fatal: file /var/tmp//ccyttLYbdebugobjtem: section
[6].rel.gnu.debuglto_.debug_info: has invalid sh_info: 9
and ld SEGVing, again in the ld -r step.
The warnings are from symtab entries like
Symbol Table Section: .symtab
index value size type bind oth ver shndx name
[0] 0 0 NOTY LOCL D 0 UNDEF
[1] 0 0 FILE LOCL D 0 ABS pr42987_0.C
[2] 0 0 NOTY LOCL D 0 9
and section 9 doesn't exist, where the input object (cp_lto_pr42987_0.o) has
Section Header[9]: sh_name: .gnu.debuglto_.debug_info
sh_addr: 0 sh_flags: 0
sh_size: 0x3d4 sh_type: [ SHT_PROGBITS ]
sh_offset: 0x7fb sh_entsize: 0
sh_link: 0 sh_info: 0
sh_addralign: 0x1
Symbol Table Section: .symtab
index value size type bind oth ver shndx / name
[0] 0 0 NOTY LOCL D 0 UNDEF
[1] 0 0 FILE LOCL D 0 ABS pr42987_0.C
[2] 0 0 SECT LOCL D 0 .text
[3] 0 0 SECT LOCL D 0 .gnu.debuglto_.debug_info
Rainer
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Subject: [Bug middle-end/83623] [8 Regression] ICE: in convert_move, at expr.c:248 with -march=knl and 16bit vector bswap/rotate
Date: Mon, 01 Jan 2018 11:10:00 -0000
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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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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/83595] [8 Regression] ICE: in linemap_macro_map_lookup, at libcpp/line-map.c:1008 on invalid code
Date: Mon, 01 Jan 2018 11:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83595
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug middle-end/83623] [8 Regression] ICE: in convert_move, at expr.c:248 with -march=knl and 16bit vector bswap/rotate
Date: Mon, 01 Jan 2018 11:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83623
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Jan 1 11:27:17 2018
New Revision: 256061
URL: https://gcc.gnu.org/viewcvs?rev=256061&root=gcc&view=rev
Log:
PR middle-end/83623
* expmed.c (expand_shift_1): For 2-byte rotates by BITS_PER_UNIT,
check for bswap in mode rather than HImode and use that in expand_unop
too.
* gcc.dg/pr83623.c: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.dg/pr83623.c
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/expmed.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83609] [7/8 Regression] ICE in read_complex_part at gcc/expr.c:3202
Date: Mon, 01 Jan 2018 11:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83609
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Jan 1 11:28:57 2018
New Revision: 256062
URL: https://gcc.gnu.org/viewcvs?rev=256062&root=gcc&view=rev
Log:
PR middle-end/83609
* expr.c (expand_assignment): Fix up a typo in simplify_gen_subreg
last argument when extracting from CONCAT. If either from_real or
from_imag is NULL, use expansion through memory. If result is not
a CONCAT and simplify_gen_subreg fails, try to simplify_gen_subreg
the parts directly to inner mode, if even that fails, use expansion
through memory.
* gcc.dg/pr83609.c: New test.
* g++.dg/opt/pr83609.C: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/opt/pr83609.C
branches/gcc-7-branch/gcc/testsuite/gcc.dg/pr83609.c
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/expr.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug rtl-optimization/83608] [7/8 Regression] ICE in convert_move, at expr.c:229 in GIMPLE store merging pass
Date: Mon, 01 Jan 2018 11:31:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Jan 1 11:30:28 2018
New Revision: 256063
URL: https://gcc.gnu.org/viewcvs?rev=256063&root=gcc&view=rev
Log:
PR middle-end/83608
* expr.c (store_expr_with_bounds): Use simplify_gen_subreg instead of
convert_modes if target mode has the right side, but different mode
class.
* g++.dg/opt/pr83608.C: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/opt/pr83608.C
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/expr.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug rtl-optimization/83608] [7/8 Regression] ICE in convert_move, at expr.c:229 in GIMPLE store merging pass
Date: Mon, 01 Jan 2018 11:38:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Version|unknown |8.0
Resolution|--- |FIXED
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 7.3+.
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Subject: [Bug tree-optimization/83609] [7/8 Regression] ICE in read_complex_part at gcc/expr.c:3202
Date: Mon, 01 Jan 2018 11:38:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed for 7.3+.
>From gcc-bugs-return-587064-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 12:45:52 2018
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Subject: [Bug c++/81917] [6/7/8 Regression] internal compiler error: in finish_member_declaration, at cp/semantics.c:3004
Date: Mon, 01 Jan 2018 12:45:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |6.5
Summary|internal compiler error: in |[6/7/8 Regression] internal
|finish_member_declaration, |compiler error: in
|at cp/semantics.c:3004 |finish_member_declaration,
| |at cp/semantics.c:3004
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Subject: [Bug fortran/20520] allocatable arrays used uninitialized without a warning
Date: Mon, 01 Jan 2018 13:17:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ondrej.certik at gmail dot com
--- Comment #18 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
*** Bug 64229 has been marked as a duplicate of this bug. ***
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Subject: [Bug fortran/64229] internal compiler error when assigning allocatable arrays of character(:)
Date: Mon, 01 Jan 2018 13:17:00 -0000
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--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Dup.
>
> *** This bug has been marked as a duplicate of bug 54070 ***
This is rather a duplicate of pr20520 once the ICE has been fixed in pr54070
(obvious if I replace character(:) with character(10)).
Compiling the test with -Wuninitialized gives the warnings
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:2:0:
character(:), allocatable :: x(:), y(:)
Warning: '.x' is used uninitialized in this function [-Wuninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:2:0: Warning:
'.y' is used uninitialized in this function [-Wuninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:3:0:
x = y
Warning: 'y.offset' is used uninitialized in this function [-Wuninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:3:0: Warning:
'y.dim[0].lbound' is used uninitialized in this function [-Wuninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:3:0: Warning:
'y.dim[0].ubound' is used uninitialized in this function [-Wuninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:3:0: Warning:
'x.offset' is used uninitialized in this function [-Wuninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:3:0: Warning:
'x.dim[0].lbound' is used uninitialized in this function [-Wuninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:3:0: Warning:
'x.dim[0].ubound' is used uninitialized in this function [-Wuninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:3:0:
x = y
Warning: 'y.dim[0].ubound' is used uninitialized in this function
[-Wuninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:3:0: Warning:
'y.dim[0].lbound' is used uninitialized in this function [-Wuninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:3:0: Warning:
'y.dim[0].lbound' may be used uninitialized in this function
[-Wmaybe-uninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:3:0: Warning:
'y.dim[0].ubound' is used uninitialized in this function [-Wuninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:3:0: Warning:
'y.dim[0].lbound' is used uninitialized in this function [-Wuninitialized]
/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/pr64229.f90:3:0: Warning:
'y.dim[0].lbound' may be used uninitialized in this function
[-Wmaybe-uninitialized]
*** This bug has been marked as a duplicate of bug 20520 ***
>From gcc-bugs-return-587067-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 13:48:45 2018
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Subject: [Bug target/83641] -fstack-clash-protection generates incorrect CFI on i386
Date: Mon, 01 Jan 2018 13:48:00 -0000
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Florian Weimer <fw at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #42995|0 |1
is obsolete| |
--- Comment #1 from Florian Weimer <fw at gcc dot gnu.org> ---
Created attachment 42999
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42999&action=edit
cfi.c
Reduced test case. Compile with -O2 -fstack-clash-protection.
f3:
.LFB0:
.cfi_startproc
pushl %esi
.cfi_def_cfa_offset 8
.cfi_offset 6, -8
pushl %ebx
.cfi_def_cfa_offset 12
.cfi_offset 3, -12
pushl %esi
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
popl %esi
.cfi_restore 6
.cfi_def_cfa_offset 12
subl $4, %esp
.cfi_def_cfa_offset 16
movl x0, %ebx
movl x1, %esi
It looks related to the probing for noreturn functions. The noreturn attribute
can even be removed as long as the infinite loop at the end is present (which I
added to suppress the warning).
>From gcc-bugs-return-587068-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 15:12:16 2018
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Subject: [Bug libfortran/46182] Run time check for invalid use of unallocated allocatable variables
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Another variant of pr20520.
*** This bug has been marked as a duplicate of bug 20520 ***
>From gcc-bugs-return-587069-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 15:12:16 2018
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Subject: [Bug fortran/20520] allocatable arrays used uninitialized without a warning
Date: Mon, 01 Jan 2018 15:12:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dominiq at lps dot ens.fr
--- Comment #19 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
*** Bug 46182 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-587070-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 15:38:44 2018
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Subject: [Bug other/82383] Some new toplevel directories are not documented
Date: Mon, 01 Jan 2018 15:38:00 -0000
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--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
libcilkrts can be removed from the list of directories to document, since it no
longer exists in trunk.
>From gcc-bugs-return-587071-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 16:18:59 2018
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Subject: [Bug libgomp/82428] Builtins for openacc gang/worker/vector id/size
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Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #42991|0 |1
is obsolete| |
--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 43000
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43000&action=edit
Updated tentative patch
Updated tentative patch, tested with nvptx accelerator.
todo: Test fortran variant.
>From gcc-bugs-return-587072-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 16:48:31 2018
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Subject: [Bug c/83559] [8 regression] -Wsuggest-attribute=const conflicts with -Wattributes warning about const attribute on function returning void
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |7.2.0
Target Milestone|--- |8.0
Summary|-Wsuggest-attribute=const |[8 regression]
|conflicts with -Wattributes |-Wsuggest-attribute=const
|warning about const |conflicts with -Wattributes
|attribute on function |warning about const
|returning void |attribute on function
| |returning void
Known to fail| |8.0
>From gcc-bugs-return-587073-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 16:51:30 2018
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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/83645] New: ICE: in get_insn_template, at final.c:2100 with -gstatement-frontiers
Date: Mon, 01 Jan 2018 16:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83645
Bug ID: 83645
Summary: ICE: in get_insn_template, at final.c:2100 with
-gstatement-frontiers
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
CC: aoliva at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 43001
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43001&action=edit
reduced testcase
Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 -gstatement-frontiers testcase.c
during RTL pass: final
testcase.c: In function 'foo':
testcase.c:7:1: internal compiler error: in get_insn_template, at final.c:2100
}
^
0x9a8f96 get_insn_template(int, rtx_def*)
/repo/gcc-trunk/gcc/final.c:2100
0x9ac10f final_scan_insn(rtx_insn*, _IO_FILE*, int, int, int*)
/repo/gcc-trunk/gcc/final.c:3029
0x9addb1 final(rtx_insn*, _IO_FILE*, int)
/repo/gcc-trunk/gcc/final.c:2065
0x9ae7e1 rest_of_handle_final
/repo/gcc-trunk/gcc/final.c:4551
0x9ae7e1 execute
/repo/gcc-trunk/gcc/final.c:4625
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-256059-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.0/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-256059-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
gcc version 8.0.0 20180101 (experimental) (GCC)
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Subject: [Bug fortran/83076] [8 Regression] ICE in gfc_deallocate_scalar_with_status, at fortran/trans.c:1598
Date: Mon, 01 Jan 2018 17:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83076
--- Comment #11 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Mon Jan 1 17:36:41 2018
New Revision: 256065
URL: https://gcc.gnu.org/viewcvs?rev=256065&root=gcc&view=rev
Log:
2018-01-01 Paul Thomas <pault@gcc.gnu.org>
PR fortran/83076
* resolve.c (resolve_fl_derived0): Add caf_token fields for
allocatable and pointer scalars, when -fcoarray selected.
* trans-types.c (gfc_copy_dt_decls_ifequal): Copy the token
field as well as the backend_decl.
(gfc_get_derived_type): Flag GFC_FCOARRAY_LIB for module
derived types that are not vtypes. Components with caf_token
attribute are pvoid types. For a component requiring it, find
the caf_token field and have the component token field point to
its backend_decl.
PR fortran/83319
*trans-types.c (gfc_get_array_descriptor_base): Add the token
field to the descriptor even when codimen not set.
2018-01-01 Paul Thomas <pault@gcc.gnu.org>
PR fortran/83076
* gfortran.dg/coarray_45.f90 : New test.
PR fortran/83319
* gfortran.dg/coarray_46.f90 : New test.
Added:
trunk/gcc/testsuite/gfortran.dg/coarray_45.f90
trunk/gcc/testsuite/gfortran.dg/coarray_46.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/gfortran.h
trunk/gcc/fortran/resolve.c
trunk/gcc/fortran/trans-types.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/83319] [7/8 Regression] ICE on use of allocatable component in derived type coarray defined in module
Date: Mon, 01 Jan 2018 17:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83319
--- Comment #3 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Mon Jan 1 17:36:41 2018
New Revision: 256065
URL: https://gcc.gnu.org/viewcvs?rev=256065&root=gcc&view=rev
Log:
2018-01-01 Paul Thomas <pault@gcc.gnu.org>
PR fortran/83076
* resolve.c (resolve_fl_derived0): Add caf_token fields for
allocatable and pointer scalars, when -fcoarray selected.
* trans-types.c (gfc_copy_dt_decls_ifequal): Copy the token
field as well as the backend_decl.
(gfc_get_derived_type): Flag GFC_FCOARRAY_LIB for module
derived types that are not vtypes. Components with caf_token
attribute are pvoid types. For a component requiring it, find
the caf_token field and have the component token field point to
its backend_decl.
PR fortran/83319
*trans-types.c (gfc_get_array_descriptor_base): Add the token
field to the descriptor even when codimen not set.
2018-01-01 Paul Thomas <pault@gcc.gnu.org>
PR fortran/83076
* gfortran.dg/coarray_45.f90 : New test.
PR fortran/83319
* gfortran.dg/coarray_46.f90 : New test.
Added:
trunk/gcc/testsuite/gfortran.dg/coarray_45.f90
trunk/gcc/testsuite/gfortran.dg/coarray_46.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/gfortran.h
trunk/gcc/fortran/resolve.c
trunk/gcc/fortran/trans-types.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-587076-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 18:07:03 2018
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From: "pault at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/83646] New: (PDT) Use statement with PDTs excludes the specific instances.
Date: Mon, 01 Jan 2018 18:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83646
Bug ID: 83646
Summary: (PDT) Use statement with PDTs excludes the specific
instances.
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: fortran
Assignee: pault at gcc dot gnu.org
Reporter: pault at gcc dot gnu.org
Blocks: 82173
Target Milestone: ---
As reported on clf
https://groups.google.com/forum/#!topic/comp.lang.fortran/NDE6JKTFbNU
[pault@pc30 pdt]$ cat f*2.f90
module m
type :: t(ell)
integer, len :: ell
integer :: i(ell)
end type
contains
subroutine sub( a )
type(t(ell=*)), intent(inout) :: a
end
end module m
! main program
use m, only : t,pdtt, sub
type(t(ell=42)) :: foo
call sub( foo )
end
[pault@pc30 pdt]$ ~/irun/bin/gfortran -static-libgfortran f*2.f90
-fdump-tree-original -g -fopenmp
fortranfan2.f90:20:18:
call sub( foo )
1
Error: Type mismatch in argument ‘a’ at (1); passed TYPE(Pdtt) to TYPE(pdtt)
with
use m, only : pdtt, t, sub
it compiles just fine.
Paul
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82173
[Bug 82173] [meta-bug] Parameterized derived type errors
>From gcc-bugs-return-587077-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 18:22:57 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 rtl-optimization/83645] ICE: in get_insn_template, at final.c:2100 with -gstatement-frontiers
Date: Mon, 01 Jan 2018 18:22:00 -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 #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The problem is that during the final pass the cfg is not available anymore, so
using
FOR_EACH_BB_FN (bb, cfun)
{
FOR_BB_INSNS_SAFE (bb, insn, next)
in delete_vta_debug_insns is incorrect at that point.
Instead at that point we need to walk insns from get_insns () up to the very
last insn in the chain.
>From gcc-bugs-return-587078-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 18:25:20 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/83559] [8 regression] -Wsuggest-attribute=const conflicts with -Wattributes warning about const attribute on function returning void
Date: Mon, 01 Jan 2018 18:25:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-01
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
The new -Wattributes warning is the (deliberate) result of r255469. The only
meaningful effect a call can have to a function that's declared with the const
attribute is return a value. Calls to such functions that ignore the returned
value are eliminated (and diagnosed with -Wunused-value). Likewise, calls to
const functions that return void are eliminated (though without a warning,
which seems like an omission). As a result, it makes little sense to declare a
function to be both const and return void, and -Wsuggest-attribute=const should
not be issued for const functions.
>From gcc-bugs-return-587079-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 18:31:03 2018
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/83646] (PDT) Use statement with PDTs excludes the specific instances.
Date: Mon, 01 Jan 2018 18:31:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-01
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--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> with
> use m, only : pdtt, t, sub
>
> it compiles just fine.
AFAICT it compiles also with
use m, only : t,pdtt, sub
but not with
use m, only : t, sub
>From gcc-bugs-return-587080-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 18:39:08 2018
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgomp/82428] Builtins for openacc gang/worker/vector id/size
Date: Mon, 01 Jan 2018 18:39:00 -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)
> Created attachment 43000 [details]
> Updated tentative patch
>
> Updated tentative patch, tested with nvptx accelerator.
Bootstrap and reg-test on x86_64 also went ok.
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Subject: [Bug java/83647] New: add x86_64 Windows support to GCJ
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83647
Bug ID: 83647
Summary: add x86_64 Windows support to GCJ
Product: gcc
Version: 6.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: java
Assignee: unassigned at gcc dot gnu.org
Reporter: yzhang1985 at gmail dot com
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Created attachment 43002
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43002&action=edit
The changes to natVMConsole.cc are only for MingW. Probably these changes don't
need to be in GCC and can be downstream
GCJ currently doesn't support x86_64 Windows, specifically x86_64-w64-mingw32.
I have made a patch that supports it. I know GCJ has been removed from GCC 7,
but I'm hoping this can still make it into GCC 6.
The changes were mostly to change 32bit ints to pointer sized ints.
Specifically,
unsigned long -> uintptr_t
jint -> jlong
Changing jint -> jlong is probably not right because that would change 32bit
builds. I wanted to change those jint to jsize and change jsize from int to
intptr_t, but wasn't sure of the effects.
The other big change was I had to replace boehm-gc with a newer version (7.2e,
7.2g crashes). GCC seems to have an out of date, custom version that doesn't
support x86_64 windows, and that only builds a static lib. I didn't include
that in the patch, but you can simply plant the newer version into the source
code.
>From gcc-bugs-return-587082-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 20:23:46 2018
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Subject: [Bug java/83647] add x86_64 Windows support to GCJ
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |WONTFIX
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC 6 is in regression only fixes due to it being a release branch.
Won't fix as Java was removed from GCC 7. There are other open source Java
implementations including but not limited to OpenJDK.
>From gcc-bugs-return-587083-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 21:18:17 2018
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Subject: [Bug java/83647] add x86_64 Windows support to GCJ
Date: Mon, 01 Jan 2018 21:18:00 -0000
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--- Comment #2 from Yale Zhang <yzhang1985 at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> GCC 6 is in regression only fixes due to it being a release branch.
>
> Won't fix as Java was removed from GCC 7. There are other open source Java
> implementations including but not limited to OpenJDK.
I was afraid of that, but I want to compile to native code and AFAIK, GCJ is
the only one or if not, the only robust one. I think this change can be useful
to others and shouldn't be lost just because GCC 6 is limited to regression
fixes only. Is there a non-release branch that this can checked into?
>From gcc-bugs-return-587084-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 22:33:43 2018
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Subject: [Bug tree-optimization/83640] [8 Regression] ICE in generic_overlap, at gimple-ssa-warn-restrict.c:814
Date: Mon, 01 Jan 2018 22:33:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
Summary|ice in generic_overlap, at |[8 Regression] ICE in
|gimple-ssa-warn-restrict.c: |generic_overlap, at
|814 |gimple-ssa-warn-restrict.c:
| |814
--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00002.html
>From gcc-bugs-return-587085-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jan 01 22:34:26 2018
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Subject: [Bug tree-optimization/83642] excessive strlen range after a strcat of non-empty string
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization, patch
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-01-01
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00003.html
>From gcc-bugs-return-587086-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 00:05:55 2018
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Subject: [Bug tree-optimization/83648] New: missing -Wsuggest-attribute=malloc on a trivial malloc-like function
Date: Tue, 02 Jan 2018 00:05:00 -0000
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Bug ID: 83648
Summary: missing -Wsuggest-attribute=malloc on a trivial
malloc-like function
Product: gcc
Version: 8.0
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The malloc() function returns a non-null pointer on success and null on
failure. Thus, a function that returns the result of malloc can be consider
"malloc-like." Likewise, a function the either returns the result of malloc or
a null pointer is itself also trivially malloc-like.
The -Wsuggest-attribute=malloc option is supposed to issue warnings for
malloc-like functions that would benefit from being declared with attribute
malloc. The following test case shows that GCC issues the warning for the
first kind of function but not for the second. The second kind is likely to be
defined to avoid the non-portable/underspecified malloc behavior with a zero
argument (malloc can return either a non-derefernceable pointer to a distinct
object or null).
$ cat a.c && gcc -O2 -S -Wall -Wsuggest-attribute=malloc a.c
void* f (unsigned n) // -Wsuggest-attribute=malloc (good)
{
return __builtin_malloc (n);
}
void* g (unsigned n) // missing -Wsuggest-attribute=malloc
{
return n ? __builtin_malloc (n) : 0;
}
a.c: In function ‘f’:
a.c:1:7: warning: function might be candidate for attribute ‘malloc’ if it is
known to return normally [-Wsuggest-attribute=malloc]
void* f (unsigned n) // -Wsuggest-attribute=malloc (good)
^
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Subject: [Bug c/83559] [8 regression] -Wsuggest-attribute=const conflicts with -Wattributes warning about const attribute on function returning void
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00004.html
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Subject: [Bug tree-optimization/83603] [8 Regression] ICE in builtin_memref at gcc/gimple-ssa-warn-restrict.c:238
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |patch
--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
Minimal patch: https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00005.html
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--- Comment #16 from Chip Salzenberg <chip at pobox dot com> ---
Still happening in 7.2
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Subject: [Bug lto/83452] FAIL: gfortran.dg/save_6.f90 -O0 (test for excess errors)
Date: Tue, 02 Jan 2018 08:46:00 -0000
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--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Jan 2 08:45:05 2018
New Revision: 256069
URL: https://gcc.gnu.org/viewcvs?rev=256069&root=gcc&view=rev
Log:
2017-01-02 Richard Biener <rguenther@suse.de>
PR lto/83452
* simple-object-elf.c (simple_object_elf_copy_lto_debug_section):
Do not use UNDEF locals for removed symbols but instead just
define them in the first prevailing section and with no name.
Use the same gnu_lto_v1 name for all removed globals we promote to
WEAK UNDEFs so hpux can use a stub to provide this symbol. Clear
sh_info and sh_link in removed sections.
Modified:
trunk/libiberty/ChangeLog
trunk/libiberty/simple-object-elf.c
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
So if you install the stublib "hack" the LTO issues should be gone.
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Subject: [Bug other/83497] CPU2000 172.mgrid starts failing with r254730
Date: Tue, 02 Jan 2018 08:57:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
The initial bisection rev. is indeed odd. I'm testing a fix for the inliner
issue btw, but I've not seen the mgrid fail on any of our x86/ia64 configs.
As far as I see the miscompare is -0.8 vs. 0.18 so it doesn't look like a
precision issue to me. Does it only happen for power6 / bigendian?
Maybe you can narrow down the root-cause somewhat - mgrid is a very small
benchmark. power6 always hints at scheduling.
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Subject: [Bug sanitizer/81645] Learn UBSAN to support -fsanitize=builtin
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Implemented by Jakub's revision r253888.
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Subject: [Bug tree-optimization/83648] missing -Wsuggest-attribute=malloc on a trivial malloc-like function
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prathamesh3492 at gcc dot gnu.org changed:
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--- Comment #1 from prathamesh3492 at gcc dot gnu.org ---
ipa-pure-const dump shows:
MALLOC LATTICE after propagation:
__builtin_malloc: malloc
g: malloc_bottom
f: malloc
So it's not able to detect that g could be annotated with malloc.
I will take a look.
Thanks,
Prathamesh
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Subject: [Bug target/83610] __builtin_expect sometimes is ignored
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|WAITING |NEW
--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Daniel Fruzynski from comment #3)
> Created attachment 42980 [details]
> Benchmark
>
> Here is benchmark for this case. With unlikely() execution time decreases
> from 20.5sec to 20.3sec - about 1%. For my real app change it was a bit more
> than 2%.
Thanks for the micro-benchmark.
>
> Thanks for information about this parameter, I will give it a try. So far I
> noticed that gcc uses CMOV when values are stored in registers. When they
> are in memory as a class fields, it generates code with branches. I am still
> playing with this code, so maybe I will need it later.
>
> BTW, what do you thing about adding 3rd param to __builtin_expect, which
> will specify probability? It may be helpful in cases like mine.
Well I haven't thought about it. From implementation point of view it will be
simple. But usage can be then a bit complicated.
Thoughts?
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Subject: [Bug target/81616] Update -mtune=generic for the current Intel and AMD processors
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--- Comment #41 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Author: hubicka
Date: Tue Jan 2 09:31:47 2018
New Revision: 256070
URL: https://gcc.gnu.org/viewcvs?rev=256070&root=gcc&view=rev
Log:
PR target/81616
* x86-tune-costs.h (generic_cost): Reduce cost of FDIV 20->17,
cost of sqrt 20->14, DIVSS 18->13, DIVSD 32->17, SQRtSS 30->14
and SQRTsD 58->18, cond_not_taken_branch_cost. 2->1. Increase
cond_taken_branch_cost 3->4.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/x86-tune-costs.h
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Subject: [Bug tree-optimization/81082] [8 Regression] Failure to vectorise after reassociating index computation
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> So is there anything we can do here?
> Isn't the bigger problem that we no longer notice the multiplications can't
> overflow?
Yes, that's the issue with all arithmetic we drop to unsigned because of
association. It's always a trade-off ...
> With the int multiplications gone, we need to assume [1, INT_MAX]
> ranges on b1, b2 and b3 in the loop (otherwise it wouldn't loop at all), and
> [0, INT_MAX - 1] ranges for i1, i2 and i3. But, from the i1 * b2 * b3 + i2
> * b3 + (i3 - 1) we could have determined that b1 * b2 * b3 is [0, INT_MAX].
>
> We do vectorize:
> int
> f (int *x, int b1, int b2, int b3)
> {
> int foo = 0;
> for (int i1 = 0; i1 < b1; ++i1)
> for (int i2 = 0; i2 < b2; ++i2)
> for (int i3 = 0; i3 < b3; ++i3)
> foo += x[(i1 * b2 + i2) * b3 + (i3 - 1)];
> return foo;
> }
> without gather loads, while the #c0 only with them (if available).
>
> Regarding the PR66313 optimization, first of all, what happened to the move
> of it to match.pd?
Given we have the reassoc pass doing this "properly" (well, but not for
signed integer types...) I have not pursused fully moving it. We might
want to move some of the more "obvious" cases (but IIRC some cases involving
constants are already handled).
So, the ultimate plan is to make reassoc stronger, rewriting assoicated
signed arithmetic to unsigned where required.
> As we vectorize:
> int
> f (int *x, int b1, int b2, int b3)
> {
> int foo = 0;
> for (int i1 = 0; i1 < b1; ++i1)
> for (int i2 = 0; i2 < b2; ++i2)
> for (int i3 = 0; i3 < b3; ++i3)
> {
> int t1 = i1 * b2 * b3;
> int t2 = i2 * b3;
> int t3 = i3 - 1;
> foo += x[t1 + t2 + t3];
> }
> return foo;
> }
>
> it seems that hasn't been done.
>
> Second thing, in fold_plusminus_mult_expr I don't understand the:
> /* We are neither factoring zero nor minus one. */
> || TREE_CODE (same) == INTEGER_CST)
> part, shouldn't that be || (TREE_CODE (same) == INTEGER_CST &&
> !integer_zerop (same) && !integer_minus_onep (same)) ?
The comment says that same == 0 or same == -1 don't happen by construction.
> Another thing is, for signed a, b, c we can't optimize a * b + a * c as
> a * (b + c) if a can be -1 or 0, exhaustive proof for signed char:
> int
> main ()
> {
> int a, b, c;
> for (a = -128; a < 128; a++)
> for (b = -128; b < 128; b++)
> for (c = -128; c < 128; c++)
> {
> int ab = a * b;
> int ac = a * c;
> int ab_ac = ab + ac;
> if (ab < -128 || ab >= 128 || ac < -128 || ac >= 128 || ab_ac < -128 ||
> ab_ac >= 128)
> continue;
> /* Ok, in this case a * b + a * c is without UB. */
> int b_c = b + c;
> #ifdef NEW
> b_c = (signed char) b_c;
> #endif
> int r = a * b_c;
> if (b_c < -128 || b_c >= 128 || r != ab_ac)
> __builtin_printf ("%d * %d + %d * %d = %d wrong opt (%d)\n", a, b, a,
> c, ab_ac, r);
> }
> return 0;
> }
>
> But, if we know for sure that a is not -1, we could optimize it as
> a * (signed)((unsigned) b + c)
> (which doesn't work for a == -1, but works for others) instead of
> (signed)(a * ((unsigned) b + c))
> (which works for all, but is a too big hammer).
>
> Perhaps if this optimization is moved over to match.pd and we'd defer it if
> a isn't constant until at least vrp1 and tune based on range info?
> The range for b3 at least during vrp pass itself is [1, INT_MAX], so neither
> -1 nor 0 are possible and we could safely reassociate it as a * (b + c)
> rather than the variants with unsigned.
>
> Or do we want to somehow mark the MULT_EXPR we've created, propagate it
> through the IL and if we in vrp notice this way marked MULT_EXPR (or IFN) we
> fold it as integer multiplication? That would be ugly.
I don't really see a good solutuon to this PR either :/
Delaying the folding to GIMPLE would be ok with me but as said I'd like to
see reassoc enhanced rather than stuffing more and more "complex" patterns
to match.pd.
Ultimatively we'd want to compute SCEV for all relevant IVs early and
cache them. That should be easy when only constants are involved but
will be tricky (impossible) when any symbols are. In the case of this
testcase it's all constants of course.
I once did experiment with "lowering" GIMPLE to -fwrapv (as RTL is) before
late reassoc and that "worked" (well, it of course regressed stuff, and it
was merely to prove reassoc of signed arithmetic is useful).
>From gcc-bugs-return-587098-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 09:51:51 2018
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Subject: [Bug tree-optimization/81082] [8 Regression] Failure to vectorise after reassociating index computation
Date: Tue, 02 Jan 2018 09:51:00 -0000
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 43003
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43003&action=edit
patch introducing "late" gimple with -fwrapv semantics
So that was for another PR, PR81554.
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Subject: [Bug debug/48150] [6/7/8 Regression] gcc.dg/guality/sra-1.c
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #20 from Richard Biener <rguenth at gcc dot gnu.org> ---
I don't see the FAIL anymore either, let's close.
>From gcc-bugs-return-587100-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 10:22:36 2018
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Subject: [Bug tree-optimization/83581] [8 Regression] ICE in expand_LOOP_VECTORIZED, at internal-fn.c:2397
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-587101-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 10:37:27 2018
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Subject: [Bug tree-optimization/83580] [6/7/8 Regression] Wrong code caused by vectorization
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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> ---
This goes wrong during pcom:
<bb 9> [local count: 136902083]:
+ _26 = (unsigned char) t_29;
+ _25 = -_26;
+ _34 = (signed char) _25;
+ _33 = (sizetype) _34;
+ _53 = _33 * 4;
+ _54 = &a + _53;
+ a_I_lsm0.9_55 = MEM[(int *)_54 + 520B];
<bb 3> [local count: 912680551]:
# i_52 = PHI <0(9), i_32(10)>
_2 = (unsigned char) t_29;
_3 = 130 - _2;
_4 = (signed char) _3;
_5 = (int) _4;
- t_31 = a[_5];
+ t_31 = a_I_lsm0.9_55;
is of course invalid, because it performs the + 130 addition in sizetype rather
than before the (signed char) cast.
>From gcc-bugs-return-587102-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 10:37:59 2018
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Subject: [Bug tree-optimization/83580] [6/7/8 Regression] Wrong code caused by vectorization
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Testcase after formatting improvements:
int a[2] = { 0, 1 };
int x = 129;
int
main ()
{
volatile int v = 0;
int t = x, i;
for (i = 0; i < 1 + v + v + v + v + v + v + v + v + a[a[0]]; i++)
t = a[(signed char) (130 - x)];
if (t != 1)
__builtin_abort ();
return 0;
}
>From gcc-bugs-return-587103-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 10:40:12 2018
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Subject: [Bug preprocessor/83602] [8 Regression] ICE in cpp_macro_definition_location(cpp_hashnode*) on invalid code
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--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think it is.
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Subject: [Bug preprocessor/83602] [8 Regression] ICE in cpp_macro_definition_location(cpp_hashnode*) on invalid code
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Subject: [Bug debug/83157] [8 regression] gcc.dg/guality/pr41616-1.c fail
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83157
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
First of all the clone should have pointed to the abstract origin of
guality_main
but it seems we re-use that for the concrete instance failing to see it
was "inlined". So the bogus location shoudln't be visible in the
guality_main.constprop () context.
After we fixed that we can continue investigating (if it still fails).
So:
;; guality_main.constprop()
<1><9f0>: Abbrev Number: 42 (DW_TAG_subprogram)
<9f1> DW_AT_abstract_origin: <0x474>
and
;; guality_main()
<1><994>: Abbrev Number: 42 (DW_TAG_subprogram)
<995> DW_AT_abstract_origin: <0x474>
refer to the same abstract instance of guality_main. But
<2><a0b>: Abbrev Number: 46 (DW_TAG_variable)
<a0c> DW_AT_abstract_origin: <0x9c1>
doesn't refer to the abstract origin copy of the variable but the concrete
instace one.
As said, with current trunk I don't even see a DIE for guality_main.constprop
because it is inlined (but the guality test still fails). Your reduced
testcase reproduces the issue for me.
Ah... I guess this all might happen because the actual DECL refers to both
the abstract instance and the concrete instance and
add_abstract_origin_attribute simply never expects the concrete instance
to exist already... But creating the DIE for the clone happens late enough
here
(when it is finally output):
Breakpoint 6, equate_decl_number_to_die (
decl=<var_decl 0x7ffff6a11f30 boring>,
decl_die=<dw_die_ref 0x7ffff6705d20 DW_TAG_variable <parent=0x7ffff6705c30
DW_TAG_subprogram>>) at /space/rguenther/src/svn/trunk2/gcc/dwarf2out.c:5763
5763 unsigned int decl_id = DECL_UID (decl);
...
Breakpoint 6, equate_decl_number_to_die (
decl=<var_decl 0x7ffff6a11f30 boring>,
decl_die=<dw_die_ref 0x7ffff675de60 DW_TAG_variable <parent=0x7ffff675daa0
DW_TAG_subprogram>>) at /space/rguenther/src/svn/trunk2/gcc/dwarf2out.c:5763
5763 unsigned int decl_id = DECL_UID (decl);
...
Breakpoint 5, add_abstract_origin_attribute (
die=<dw_die_ref 0x7ffff6763460 DW_TAG_variable <parent=0x7ffff67633c0
DW_TAG_subprogram>>, origin=<var_decl 0x7ffff6a11f30 boring>)
at /space/rguenther/src/svn/trunk2/gcc/dwarf2out.c:20445
20445 dw_die_ref origin_die = NULL;
boring
(gdb) p debug_generic_expr (cfun->decl)
guality_main.constprop
(gdb) p origin_die
$24 = <dw_die_ref 0x7ffff675de60 DW_TAG_variable <parent=0x7ffff675daa0
DW_TAG_subprogram>>
This means we're lacking an "early" DIE creation stage for the function clone.
IPA materialization happens early enough for this.
Forgoing the 1:1 mapping of decl to DIE would be another possibility to fix
this (making the global map always point to the abstract copy and adding
a local map for querying during dwarf2out_function_decl).
Jason?
>From gcc-bugs-return-587106-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 11:03:23 2018
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Subject: [Bug tree-optimization/83648] missing -Wsuggest-attribute=malloc on a trivial malloc-like function
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--- Comment #2 from prathamesh3492 at gcc dot gnu.org ---
Created attachment 43004
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43004&action=edit
Untested fix
>From gcc-bugs-return-587107-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 11:19:23 2018
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Subject: [Bug tree-optimization/83580] [6/7/8 Regression] Wrong code caused by vectorization
Date: Tue, 02 Jan 2018 11:19:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Seems create_data_ref creates something bogus, it really can't split off the
offset from the base.
dr_analyze_innermost calls:
897 split_constant_offset (offset_iv.base, &offset_iv.base, &dinit);
with offset_iv.base being originally
(sizetype) (signed char) (130 - (unsigned char) t_29) * 4
and makes (sizetype) (signed char) -(unsigned char) t_29 * 4 out of it with
dinit 520.
split_constant_offset uses STRIP_NOPS and split_constant_offset_1 has:
698 /* We must not introduce undefined overflow, and we must not
change the value.
699 Hence we're okay if the inner type doesn't overflow to start
with
700 (pointer or signed), the outer type also is an integer or
pointer
701 and the outer precision is at least as large as the inner.
*/
702 tree itype = TREE_TYPE (op0);
703 if ((POINTER_TYPE_P (itype)
704 || (INTEGRAL_TYPE_P (itype) && TYPE_OVERFLOW_UNDEFINED
(itype)))
705 && TYPE_PRECISION (type) >= TYPE_PRECISION (itype)
706 && (POINTER_TYPE_P (type) || INTEGRAL_TYPE_P (type)))
707 {
708 split_constant_offset (op0, &var0, off);
709 *var = fold_convert (type, var0);
710 return true;
711 }
712 return false;
Richard, can you please have a look?
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/81968] [8 regression] early lto debug objects make Solaris ld SEGV
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--- Comment #39 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #38)
> >> --- Comment #33 from rguenther at suse dot de <rguenther at suse dot de> ---
> > [...]
> >>>* Invalid sh_info:
> >>>
> >>>FAIL: g++.dg/lto/pr42987 cp_lto_pr42987_0.o-cp_lto_pr42987_1.o link,
> >>>-flto
> >>>-flto-partition=none -g
> >>>FAIL: g++.dg/lto/pr42987 cp_lto_pr42987_0.o-cp_lto_pr42987_1.o link,
> >>>-flto -g
> >>>
> >>>ld: fatal: file /var/tmp//ccXwdzGddebugobjtem: section
> >>>[6].rel.gnu.debuglto_.debug_info: has invalid sh_info: 9
> >>>ld: fatal: file /var/tmp//ccuVJOVbdebugobjtem: section
> >>>[6].rel.gnu.debuglto_.debug_info: has invalid sh_info: 8
> >>>
> >>> seen during the ld -r -o ccrIZb_ddebugobj ccSerOuddebugobjtem
> >>> cc5b3Arcdebugobjtem step:
> >>>
> >>>ccSerOuddebugobjtem: .rel.gnu.debuglto_.debug_info: sh_info: 9: does
> >>>not point
> >>>to a valid section
> >>>
> >>>Section Header[6]: sh_name: .rel.gnu.debuglto_.debug_info
> >>> sh_addr: 0 sh_flags: 0
> >>> sh_size: 0x8 sh_type: [ SHT_REL ]
> >>> sh_offset: 0x11c8 sh_entsize: 0x8 (1 entry)
> >>> sh_link: 5 sh_info: 9
> >>> sh_addralign: 0x4
> >>>
> >>> But there's no section 9 any longer.
> >>
> >> I fixed that in the posted patch for the hpux issue(s).
> >
> > Good: I'll try to merge the two after the christmas holidays.
>
> I've used the attached patch, with mixed results:
>
> * No changes on SPARC (which wasn't affected by this issue in the first
> place).
>
> * On x86, of the previous 32 ld: fatal: has invalid sh_info errors, 16
> are now gone.
>
> However, I've many (1284 in g++.log) instances of
>
> ld: warning: symbol .symtab[2] has invalid section index; ignored:
> (file /var/tmp//ccyttLYbdebugobjtem value=9);
>
> Those links end with
>
> ld: fatal: file /var/tmp//ccyttLYbdebugobjtem: section
> [6].rel.gnu.debuglto_.debug_info: has invalid sh_info: 9
>
> and ld SEGVing, again in the ld -r step.
>
> The warnings are from symtab entries like
>
> Symbol Table Section: .symtab
> index value size type bind oth ver shndx name
> [0] 0 0 NOTY LOCL D 0 UNDEF
> [1] 0 0 FILE LOCL D 0 ABS pr42987_0.C
> [2] 0 0 NOTY LOCL D 0 9
>
> and section 9 doesn't exist, where the input object (cp_lto_pr42987_0.o)
> has
Just guessing that it maybe doesn't like NOTYPE on local defs? I would
expect that before the partial link step that section 9 would exist.
Does
Index: libiberty/simple-object-elf.c
===================================================================
--- libiberty/simple-object-elf.c (revision 256070)
+++ libiberty/simple-object-elf.c (working copy)
@@ -1400,9 +1400,9 @@ simple_object_elf_copy_lto_debug_section
gnu_lto - strings);
ELF_SET_FIELD (type_functions, ei_class, Sym,
ent, st_shndx, Elf_Half, SHN_UNDEF);
+ *st_info = ELF_ST_INFO (bind, STT_NOTYPE);
}
*st_other = other;
- *st_info = ELF_ST_INFO (bind, STT_NOTYPE);
ELF_SET_FIELD (type_functions, ei_class, Sym,
ent, st_value, Elf_Addr, 0);
ELF_SET_FIELD (type_functions, ei_class, Sym,
fix these errors?
>
> Section Header[9]: sh_name: .gnu.debuglto_.debug_info
> sh_addr: 0 sh_flags: 0
> sh_size: 0x3d4 sh_type: [ SHT_PROGBITS ]
> sh_offset: 0x7fb sh_entsize: 0
> sh_link: 0 sh_info: 0
> sh_addralign: 0x1
>
> Symbol Table Section: .symtab
> index value size type bind oth ver shndx / name
> [0] 0 0 NOTY LOCL D 0 UNDEF
> [1] 0 0 FILE LOCL D 0 ABS pr42987_0.C
> [2] 0 0 SECT LOCL D 0 .text
> [3] 0 0 SECT LOCL D 0 .gnu.debuglto_.debug_info
>
> Rainer
>From gcc-bugs-return-587109-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 12:07:33 2018
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/83008] [performance] Is it better to avoid extra instructions in data passing between loops?
Date: Tue, 02 Jan 2018 12:07:00 -0000
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--- Comment #19 from rguenther at suse dot de <rguenther at suse dot de> ---
On Sun, 24 Dec 2017, sergey.shalnov at intel dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83008
>
> --- Comment #18 from sergey.shalnov at intel dot com ---
> Yes, I agree that vector_store stage has it’s own vectorization cost.
> And each vector_store has vector_construction stage. These stages are different
> in gcc slp (as you know).
> To better illustrate my point of view I would like to propose a patch.
> I didn’t submit the patch to community yet because I think it is better to
> discuss it before that.
>
> index 0ca42b4..72e3123 100644
> --- a/gcc/tree-vect-slp.c
> +++ b/gcc/tree-vect-slp.c
> @@ -1825,7 +1825,7 @@ vect_analyze_slp_cost_1 (slp_instance instance, slp_tree
> node,
> record_stmt_cost (prologue_cost_vec, 1, vector_load,
> stmt_info, 0, vect_prologue);
> else if (dt == vect_external_def)
> - record_stmt_cost (prologue_cost_vec, 1, vec_construct,
> + record_stmt_cost (prologue_cost_vec, ncopies_for_cost,
> vec_construct,
> stmt_info, 0, vect_prologue);
> }
> }
I'm not sure it affects the testcase in question but yes, there's
imprecision in this in that it assumes too much CSE happening.
Using ncopies_for_cost will over-estimate the cost though,
it will match the code we generate though (CSE will cleanup).
As the comment says this code should be re-engineered ;) (it also
misses to make a splat cheap). Sth like the following might work
for most cases:
Index: gcc/tree-vect-slp.c
===================================================================
--- gcc/tree-vect-slp.c (revision 256070)
+++ gcc/tree-vect-slp.c (working copy)
@@ -1815,18 +1815,41 @@ vect_analyze_slp_cost_1 (slp_instance in
enum vect_def_type dt;
if (!op || op == lhs)
continue;
- if (vect_is_simple_use (op, stmt_info->vinfo, &def_stmt, &dt))
+ if (vect_is_simple_use (op, stmt_info->vinfo, &def_stmt, &dt)
+ && (dt == vect_constant_def || dt == vect_external_def))
{
/* Without looking at the actual initializer a vector of
constants can be implemented as load from the constant pool.
- ??? We need to pass down stmt_info for a vector type
- even if it points to the wrong stmt. */
- if (dt == vect_constant_def)
- record_stmt_cost (prologue_cost_vec, 1, vector_load,
- stmt_info, 0, vect_prologue);
- else if (dt == vect_external_def)
- record_stmt_cost (prologue_cost_vec, 1, vec_construct,
- stmt_info, 0, vect_prologue);
+ When all elements are the same we can use a splat. */
+ tree vectype = get_vectype_for_scalar_type (TREE_TYPE (op));
+ unsigned nunits = TYPE_VECTOR_SUBPARTS (vectype);
+ unsigned group_size = SLP_TREE_SCALAR_STMTS (node).length ();
+ tree elt = NULL_TREE;
+ unsigned nelt = 0;
+ for (unsigned j = 0; j < ncopies_for_cost * nunits / group_size; ++j)
+ for (unsigned k = 0; k < group_size; ++k)
+ {
+ if (nelt == 0)
+ elt = gimple_op (SLP_TREE_SCALAR_STMTS (node)[nelt], i);
+ /* ??? We're just tracking whether all operands of a single
+ vector initializer are the same, ideally we'd check if
+ we emitted the same one already. */
+ else if (elt != gimple_op (SLP_TREE_SCALAR_STMTS (node)[nelt],
+ i))
+ elt = NULL_TREE;
+ nelt++;
+ if (nelt == group_size)
+ {
+ /* ??? We need to pass down stmt_info for a vector type
+ even if it points to the wrong stmt. */
+ record_stmt_cost (prologue_cost_vec, 1,
+ dt == vect_external_def
+ ? (elt ? scalar_to_vec : vec_construct)
+ : vector_load,
+ stmt_info, 0, vect_prologue);
+ nelt = 0;
+ }
+ }
}
}
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Subject: [Bug tree-optimization/82133] [7/8 Regression] unroll-loops too aggressive
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |INVALID
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Bougs inline-asm. There's nothing we can do on the GCC side here.
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Subject: [Bug tree-optimization/82665] missing value range optimization for memchr
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prathamesh3492 at gcc dot gnu.org changed:
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--- Comment #2 from prathamesh3492 at gcc dot gnu.org ---
Patch posted upstream -
https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00020.html
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Subject: [Bug c++/83634] [8 Regression] ICE in useless_type_conversion_p, at gimple-expr.c:86
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43005
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43005&action=edit
gcc8-pr83634.patch
Untested fix.
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Subject: [Bug libfortran/83649] New: Large reads fail
Date: Tue, 02 Jan 2018 12:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83649
Bug ID: 83649
Summary: Large reads fail
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libfortran
Assignee: unassigned at gcc dot gnu.org
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Consider the testcase
program largewr
integer(kind=1) :: a(2_8**31+1)
a = 0
a(size(a, kind=8)) = 1
open(10, file="largewr.dat", access="stream", form="unformatted")
write (10) a
close(10)
a(size(a, kind=8)) = 2
open(10, file="largewr.dat", access="stream", form="unformatted")
read (10) a
if (a(size(a, kind=8)) == 1) then
print *, "All is well"
else
print *, "Oh no"
end if
end program largewr
This fails on x86_64-pc-linux-gnu with
./a.out
At line 10 of file largewr.f90 (unit = 10, file = 'largewr.dat')
Fortran runtime error: End of file
[snip]
The reason is that Linux never reads or writes more than 2,147,479,552 bytes in
a single syscall. For write libgfortran does the writing in a loop, and it's
handled correctly, but for read we cannot do that loop since then it will hang
when reading from the terminal where short reads are perfectly Ok.
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Subject: [Bug libfortran/83649] Large reads fail
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--- Comment #1 from Janne Blomqvist <jb at gcc dot gnu.org> ---
I forgot a reference; see http://man7.org/linux/man-pages/man2/read.2.html
https://stackoverflow.com/questions/38586144/error-when-trying-to-write-a-file-larger-than-2-gb-on-linux
suggests that macOS isn't able to handle writes >= 2 GB either.
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Subject: [Bug c++/64462] ICE while compiling lambda using local constexpr reference variable
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #6 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
The test case is valid, as this is not an ODR use of 'y'. added a comment to
it.
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Subject: [Bug c++/82541] Wduplicated-branches triggers in template context
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |mpolacek at gcc dot gnu.org
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I have a fix for the original test.
>From gcc-bugs-return-587117-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 12:50:03 2018
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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/83051] [8 Regression] ICE on valid code at -O3: in edge_badness, at ipa-inline.c:1024
Date: Tue, 02 Jan 2018 12:50:00 -0000
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--- Comment #3 from Zdenek Sojka <zsojka at seznam dot cz> ---
Created attachment 43006
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43006&action=edit
different testcase
$ x86_64-pc-linux-gnu-gcc -O --param=max-inline-recursive-depth=84 testcase.c
-Wno-psabi
during IPA pass: inline
testcase.c:20:1: internal compiler error: in edge_badness, at ipa-inline.c:997
}
^
0x16e77b1 edge_badness
/repo/gcc-trunk/gcc/ipa-inline.c:996
0x16e78d9 update_edge_key
/repo/gcc-trunk/gcc/ipa-inline.c:1195
0x16e81d8 update_callee_keys
/repo/gcc-trunk/gcc/ipa-inline.c:1361
0x16e9ec5 inline_small_functions
/repo/gcc-trunk/gcc/ipa-inline.c:1965
0x16eaf83 ipa_inline
/repo/gcc-trunk/gcc/ipa-inline.c:2449
0x16eaf83 execute
/repo/gcc-trunk/gcc/ipa-inline.c:2855
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
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Subject: [Bug target/81616] Update -mtune=generic for the current Intel and AMD processors
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--- Comment #42 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Author: hubicka
Date: Tue Jan 2 13:04:19 2018
New Revision: 256073
URL: https://gcc.gnu.org/viewcvs?rev=256073&root=gcc&view=rev
Log:
PR target/81616
* config/i386/x86-tune-costs.h: Increase cost of integer load costs
for generic 4->6.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/x86-tune-costs.h
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Note, the #c0 testcase has been fixed with r216056 aka PR63207 fix.
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Subject: [Bug libfortran/83649] Large reads fail
Date: Tue, 02 Jan 2018 13:25:00 -0000
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--- Comment #2 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Author: jb
Date: Tue Jan 2 13:25:10 2018
New Revision: 256074
URL: https://gcc.gnu.org/viewcvs?rev=256074&root=gcc&view=rev
Log:
PR libgfortran/83649 Chunk large reads and writes
It turns out that Linux never reads or writes more than 2147479552
bytes in a single syscall. For writes this is not a problem as
libgfortran already contains a loop around write() to handle short
writes. But for reads we cannot do this, since then read will hang if
we have a short read when reading from the terminal. Also, there are
reports that macOS fails I/O's larger than 2 GB. Thus, to work around
these issues do large reads/writes in chunks.
The testcase from the PR
program largewr
integer(kind=1) :: a(2_8**31+1)
a = 0
a(size(a, kind=8)) = 1
open(10, file="largewr.dat", access="stream", form="unformatted")
write (10) a
close(10)
a(size(a, kind=8)) = 2
open(10, file="largewr.dat", access="stream", form="unformatted")
read (10) a
if (a(size(a, kind=8)) == 1) then
print *, "All is well"
else
print *, "Oh no"
end if
end program largewr
fails on trunk but works with the patch.
Regtested on x86_64-pc-linux-gnu, committed to trunk.
libgfortran/ChangeLog:
2018-01-02 Janne Blomqvist <jb@gcc.gnu.org>
PR libgfortran/83649
* io/unix.c (MAX_CHUNK): New define.
(raw_read): For reads larger than MAX_CHUNK, loop.
(raw_write): Write no more than MAX_CHUNK bytes per iteration.
Modified:
trunk/libgfortran/ChangeLog
trunk/libgfortran/io/unix.c
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Subject: [Bug preprocessor/83602] [8 Regression] ICE in cpp_macro_definition_location(cpp_hashnode*) on invalid code
Date: Tue, 02 Jan 2018 13:40:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43007
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43007&action=edit
gcc8-pr83602.patch
Untested fix. For builtin macros, it doesn't make sense to look at definition
location, that is builtin, and they don't use value.macro union member but
rather value.builtin.
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Subject: [Bug lto/81968] [8 regression] early lto debug objects make Solaris ld SEGV
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--- Comment #40 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #39 from Richard Biener <rguenth at gcc dot gnu.org> ---
[...]
>> * On x86, of the previous 32 ld: fatal: has invalid sh_info errors, 16
>> are now gone.
>>
>> However, I've many (1284 in g++.log) instances of
>>
>> ld: warning: symbol .symtab[2] has invalid section index; ignored:
>> (file /var/tmp//ccyttLYbdebugobjtem value=9);
>>
>> Those links end with
>>
>> ld: fatal: file /var/tmp//ccyttLYbdebugobjtem: section
>> [6].rel.gnu.debuglto_.debug_info: has invalid sh_info: 9
>>
>> and ld SEGVing, again in the ld -r step.
>>
>> The warnings are from symtab entries like
>>
>> Symbol Table Section: .symtab
>> index value size type bind oth ver shndx name
>> [0] 0 0 NOTY LOCL D 0 UNDEF
>> [1] 0 0 FILE LOCL D 0 ABS pr42987_0.C
>> [2] 0 0 NOTY LOCL D 0 9
>>
>> and section 9 doesn't exist, where the input object (cp_lto_pr42987_0.o)
>> has
>
> Just guessing that it maybe doesn't like NOTYPE on local defs? I would
I don't think so. With your patch, the affected symbols are SECT
instead of LOCL, otherwise no difference.
> expect that before the partial link step that section 9 would exist.
It does indeed as I mentioned (cp_lto_pr42987_0.o is the input object
corresponding to ccyttLYbdebugobjtem).
> Does
>
> Index: libiberty/simple-object-elf.c
> ===================================================================
> --- libiberty/simple-object-elf.c (revision 256070)
> +++ libiberty/simple-object-elf.c (working copy)
> @@ -1400,9 +1400,9 @@ simple_object_elf_copy_lto_debug_section
> gnu_lto - strings);
> ELF_SET_FIELD (type_functions, ei_class, Sym,
> ent, st_shndx, Elf_Half, SHN_UNDEF);
> + *st_info = ELF_ST_INFO (bind, STT_NOTYPE);
> }
> *st_other = other;
> - *st_info = ELF_ST_INFO (bind, STT_NOTYPE);
> ELF_SET_FIELD (type_functions, ei_class, Sym,
> ent, st_value, Elf_Addr, 0);
> ELF_SET_FIELD (type_functions, ei_class, Sym,
>
> fix these errors?
Unfortunately not: it's really the section index pointing to the
non-existing (i.e. eliminated) .gnu.debuglto_.debug_info section.
Rainer
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Subject: [Bug rtl-optimization/83480] [8 Regression] ICE in create_block_for_bookkeeping, at sel-sched.c:4557
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r255607 (at least the #c2 testcase).
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/83051] [8 Regression] ICE on valid code at -O3: in edge_badness, at ipa-inline.c:1024
Date: Tue, 02 Jan 2018 14:16:00 -0000
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Zdenek Sojka from comment #3)
> Created attachment 43006 [details]
> different testcase
>
> $ x86_64-pc-linux-gnu-gcc -O --param=max-inline-recursive-depth=84
> testcase.c -Wno-psabi
> during IPA pass: inline
> testcase.c:20:1: internal compiler error: in edge_badness, at
> ipa-inline.c:997
> }
> ^
> 0x16e77b1 edge_badness
> /repo/gcc-trunk/gcc/ipa-inline.c:996
> 0x16e78d9 update_edge_key
> /repo/gcc-trunk/gcc/ipa-inline.c:1195
> 0x16e81d8 update_callee_keys
> /repo/gcc-trunk/gcc/ipa-inline.c:1361
> 0x16e9ec5 inline_small_functions
> /repo/gcc-trunk/gcc/ipa-inline.c:1965
> 0x16eaf83 ipa_inline
> /repo/gcc-trunk/gcc/ipa-inline.c:2449
> 0x16eaf83 execute
> /repo/gcc-trunk/gcc/ipa-inline.c:2855
> 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.
Confirmed, rounding issue here:
edge_time: 10210501197824.000000
callee_info->time: 10210501206016.000000
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Subject: [Bug lto/81968] [8 regression] early lto debug objects make Solaris ld SEGV
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--- Comment #41 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 2 Jan 2018, ro at CeBiTec dot Uni-Bielefeld.DE wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81968
>
> --- Comment #40 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> > --- Comment #39 from Richard Biener <rguenth at gcc dot gnu.org> ---
> [...]
> >> * On x86, of the previous 32 ld: fatal: has invalid sh_info errors, 16
> >> are now gone.
> >>
> >> However, I've many (1284 in g++.log) instances of
> >>
> >> ld: warning: symbol .symtab[2] has invalid section index; ignored:
> >> (file /var/tmp//ccyttLYbdebugobjtem value=9);
> >>
> >> Those links end with
> >>
> >> ld: fatal: file /var/tmp//ccyttLYbdebugobjtem: section
> >> [6].rel.gnu.debuglto_.debug_info: has invalid sh_info: 9
> >>
> >> and ld SEGVing, again in the ld -r step.
> >>
> >> The warnings are from symtab entries like
> >>
> >> Symbol Table Section: .symtab
> >> index value size type bind oth ver shndx name
> >> [0] 0 0 NOTY LOCL D 0 UNDEF
> >> [1] 0 0 FILE LOCL D 0 ABS pr42987_0.C
> >> [2] 0 0 NOTY LOCL D 0 9
> >>
> >> and section 9 doesn't exist, where the input object (cp_lto_pr42987_0.o)
> >> has
> >
> > Just guessing that it maybe doesn't like NOTYPE on local defs? I would
>
> I don't think so. With your patch, the affected symbols are SECT
> instead of LOCL, otherwise no difference.
>
> > expect that before the partial link step that section 9 would exist.
>
> It does indeed as I mentioned (cp_lto_pr42987_0.o is the input object
> corresponding to ccyttLYbdebugobjtem).
>
> > Does
> >
> > Index: libiberty/simple-object-elf.c
> > ===================================================================
> > --- libiberty/simple-object-elf.c (revision 256070)
> > +++ libiberty/simple-object-elf.c (working copy)
> > @@ -1400,9 +1400,9 @@ simple_object_elf_copy_lto_debug_section
> > gnu_lto - strings);
> > ELF_SET_FIELD (type_functions, ei_class, Sym,
> > ent, st_shndx, Elf_Half, SHN_UNDEF);
> > + *st_info = ELF_ST_INFO (bind, STT_NOTYPE);
> > }
> > *st_other = other;
> > - *st_info = ELF_ST_INFO (bind, STT_NOTYPE);
> > ELF_SET_FIELD (type_functions, ei_class, Sym,
> > ent, st_value, Elf_Addr, 0);
> > ELF_SET_FIELD (type_functions, ei_class, Sym,
> >
> > fix these errors?
>
> Unfortunately not: it's really the section index pointing to the
> non-existing (i.e. eliminated) .gnu.debuglto_.debug_info section.
But that section shouldn't be eliminated :/
>From gcc-bugs-return-587126-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 14:28:57 2018
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Subject: [Bug c++/81860] [7/8 Regression] Call to undefined inline function involving inheriting constructors
Date: Tue, 02 Jan 2018 14:28:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |mpolacek at gcc dot gnu.org
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--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed by r251426. I'll add the test at least. I think it's worth it because I
see no lambdas in the testcase.
>From gcc-bugs-return-587127-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 14:29:50 2018
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Subject: [Bug rtl-optimization/83480] [8 Regression] ICE in create_block_for_bookkeeping, at sel-sched.c:4557
Date: Tue, 02 Jan 2018 14:29:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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CC| |aoliva at gcc dot gnu.org
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The ICE goes away with -gno-statement-frontiers, perhaps if sel-sched is
unfixable we should disable statement frontiers in addition to
var-tracking-assignments that we already disable for sel-sched.
>From gcc-bugs-return-587128-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 14:30:42 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 lto/81968] [8 regression] early lto debug objects make Solaris ld SEGV
Date: Tue, 02 Jan 2018 14:30:00 -0000
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--- Comment #42 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #41 from rguenther at suse dot de <rguenther at suse dot de> ---
[...]
>> Unfortunately not: it's really the section index pointing to the
>> non-existing (i.e. eliminated) .gnu.debuglto_.debug_info section.
>
> But that section shouldn't be eliminated :/
IIUC it has been renamed to .debug_info:
* input object (cp_lto_pr42987_0.o):
Section Header[9]: sh_name: .gnu.debuglto_.debug_info
sh_addr: 0 sh_flags: 0
sh_size: 0x3d4 sh_type: [ SHT_PROGBITS ]
sh_offset: 0x7fb sh_entsize: 0
sh_link: 0 sh_info: 0
sh_addralign: 0x1
* output object (ccw3tETddebugobjtem):
Section Header[2]: sh_name: .debug_info
sh_addr: 0 sh_flags: 0
sh_size: 0x3d4 sh_type: [ SHT_PROGBITS ]
sh_offset: 0x84d sh_entsize: 0
sh_link: 0 sh_info: 0
sh_addralign: 0x1
without adapting section indices in .symtab.
Besides, there's also a dangling
Section Header[6]: sh_name: .rel.gnu.debuglto_.debug_info
sh_addr: 0 sh_flags: 0
sh_size: 0x8 sh_type: [ SHT_REL ]
sh_offset: 0x11c8 sh_entsize: 0x8 (1 entry)
sh_link: 5 sh_info: 9
sh_addralign: 0x4
in the output object.
Rainer
>From gcc-bugs-return-587129-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 14:36:57 2018
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/81968] [8 regression] early lto debug objects make Solaris ld SEGV
Date: Tue, 02 Jan 2018 14:36:00 -0000
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--- Comment #43 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 2 Jan 2018, ro at CeBiTec dot Uni-Bielefeld.DE wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81968
>
> --- Comment #42 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> > --- Comment #41 from rguenther at suse dot de <rguenther at suse dot de> ---
> [...]
> >> Unfortunately not: it's really the section index pointing to the
> >> non-existing (i.e. eliminated) .gnu.debuglto_.debug_info section.
> >
> > But that section shouldn't be eliminated :/
>
> IIUC it has been renamed to .debug_info:
>
> * input object (cp_lto_pr42987_0.o):
>
> Section Header[9]: sh_name: .gnu.debuglto_.debug_info
> sh_addr: 0 sh_flags: 0
> sh_size: 0x3d4 sh_type: [ SHT_PROGBITS ]
> sh_offset: 0x7fb sh_entsize: 0
> sh_link: 0 sh_info: 0
> sh_addralign: 0x1
>
> * output object (ccw3tETddebugobjtem):
>
> Section Header[2]: sh_name: .debug_info
> sh_addr: 0 sh_flags: 0
> sh_size: 0x3d4 sh_type: [ SHT_PROGBITS ]
> sh_offset: 0x84d sh_entsize: 0
> sh_link: 0 sh_info: 0
> sh_addralign: 0x1
>
> without adapting section indices in .symtab.
Yes. It should have retained [9] as section index. Hmmm - you
have the patch removing sections in your tree? I guess you need
to adapt (aka remap) the first_shndx section index I added with
the patch for the hpux ld issue.
> Besides, there's also a dangling
>
> Section Header[6]: sh_name: .rel.gnu.debuglto_.debug_info
> sh_addr: 0 sh_flags: 0
> sh_size: 0x8 sh_type: [ SHT_REL ]
> sh_offset: 0x11c8 sh_entsize: 0x8 (1 entry)
> sh_link: 5 sh_info: 9
> sh_addralign: 0x4
>
> in the output object.
that should have been used as the reloc section for the new section 2.
I see sh_info is still 9, it should be 2. That's eventually
missing handling in the section removal patch.
I've committed the hpux fix so in case you re-base the patch and
fix up the first_shndx issue please attach the rebased one.
>From gcc-bugs-return-587130-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 14:53:07 2018
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Subject: [Bug c++/83644] ICE using type alias from recursive decltype in noexcept or return type
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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| |jason at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This got fixed on the trunk with r251433. We should add the testcase to the
testsuite.
>From gcc-bugs-return-587131-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 14:55:11 2018
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Subject: [Bug tree-optimization/83640] [8 Regression] ICE in generic_overlap, at gimple-ssa-warn-restrict.c:814
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-587132-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 14:56:40 2018
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Subject: [Bug rtl-optimization/83629] [7/8 Regression] ICE: in decompose_normal_address, at rtlanal.c:6329 with -O2 -fPIC -frename-registers --param=sched-autopref-queue-depth=nnn
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-587134-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 14:58:27 2018
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Subject: [Bug ipa/83619] [8 Regression] ICE in inliner: caller edge count does not match BB count
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/83621] [8 Regression] ICE: in simplify_subreg, at simplify-rtx.c:6293 with -O -g
Date: Tue, 02 Jan 2018 14:58:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug tree-optimization/83603] [8 Regression] ICE in builtin_memref at gcc/gimple-ssa-warn-restrict.c:238
Date: Tue, 02 Jan 2018 15:00:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-587135-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:00:29 2018
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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
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-587138-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:00:49 2018
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83644] ICE using type alias from recursive decltype in noexcept or return type
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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Status|UNCONFIRMED |ASSIGNED
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CC| |mpolacek at gcc dot gnu.org
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Ever confirmed|0 |1
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
On it.
>From gcc-bugs-return-587136-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:00:35 2018
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Subject: [Bug tree-optimization/83605] [6/7/8 Regression] ICE: verify_gimple failed (error: dead STMT in EH table)
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-587139-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:01:45 2018
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Subject: [Bug ipa/83594] [8 Regression] ICE: in function_and_variable_visibility, at ipa-visibility.c:640 with __attribute__((noipa))
Date: Tue, 02 Jan 2018 15:01:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-587141-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:01:58 2018
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Subject: [Bug c++/83592] [8 Regression] Annoying -Wparentheses warnings
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-587140-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:01:52 2018
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Subject: [Bug tree-optimization/83593] [8 Regression] ICE: verify_gimple failed (error: statement marked for throw, but doesn't)
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-587142-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:02:59 2018
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Subject: [Bug c/83586] [8 regression] Invalid -Wformat-truncation on stdio2.h
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-587143-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:03:33 2018
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Subject: [Bug target/83585] [8 Regression] Assembler messages: Error: can't resolve `.text' {.text section} - `.LCOLDB0' {.text.unlikely section}
Date: Tue, 02 Jan 2018 15:03:00 -0000
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Subject: [Bug tree-optimization/83580] [6/7/8 Regression] Wrong code caused by vectorization
Date: Tue, 02 Jan 2018 15:05:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.
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Subject: [Bug c++/81860] [7/8 Regression] Call to undefined inline function involving inheriting constructors
Date: Tue, 02 Jan 2018 15:05:00 -0000
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--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Jan 2 15:05:09 2018
New Revision: 256076
URL: https://gcc.gnu.org/viewcvs?rev=256076&root=gcc&view=rev
Log:
PR c++/81860
* g++.dg/cpp0x/inh-ctor30.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/inh-ctor30.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug rtl-optimization/83575] [8 Regression] ICE: verify_flow_info failed (error: multiple hot/cold transitions found)
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug c++/81860] [7 Regression] Call to undefined inline function involving inheriting constructors
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Summary|[7/8 Regression] Call to |[7 Regression] Call to
|undefined inline function |undefined inline function
|involving inheriting |involving inheriting
|constructors |constructors
--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Done.
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Subject: [Bug tree-optimization/83573] [6/7/8 Regression] invalid access introduced in predcom
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug tree-optimization/83580] [6/7/8 Regression] Wrong code caused by vectorization
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 83573 has been marked as a duplicate of this bug. ***
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Subject: [Bug tree-optimization/83573] [6/7/8 Regression] invalid access introduced in predcom
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Dup.
*** This bug has been marked as a duplicate of bug 83580 ***
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Subject: [Bug tree-optimization/83572] [8 Regression] [graphite] ICE in verify_dominators, at dominance.c:1184 (error: dominator of 7 should be 15, not 13)
Date: Tue, 02 Jan 2018 15:07:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-01-02
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Target Milestone|--- |8.0
Ever confirmed|0 |1
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will have a look.
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Subject: [Bug tree-optimization/83563] [8 Regression] [graphite] ICE: Segmentation fault (in instantiate_scev_r)
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-01-02
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Target Milestone|--- |8.0
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will have a look.
>From gcc-bugs-return-587153-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:10:36 2018
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Subject: [Bug c++/83555] Unnecessary null check when static_cast is used with references.
Date: Tue, 02 Jan 2018 15:10:00 -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> ---
missed opitmization in the C++ FE.
>From gcc-bugs-return-587154-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:10:48 2018
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Subject: [Bug target/83554] [8 Regression] ICE: in ix86_mitigate_rop, at config/i386/i386.c:41274 with -mmitigate-rop
Date: Tue, 02 Jan 2018 15:10:00 -0000
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>From gcc-bugs-return-587155-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:12:29 2018
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Subject: [Bug tree-optimization/83544] Missed optimization opportunity for constant folding
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-587156-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:14:30 2018
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Subject: [Bug fortran/83650] New: [7/8 Regression] Wrong simplification in cshift with negative shifts
Date: Tue, 02 Jan 2018 15:14:00 -0000
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Bug ID: 83650
Summary: [7/8 Regression] Wrong simplification in cshift with
negative shifts
Product: gcc
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Discovered investigating a "failure" in my current work on the
cshift patch:
program main
integer, dimension(5), parameter :: b = [1,2,3,4,5]
integer, dimension(5) :: a = [1,2,3,4,5]
print *,cshift(a, -4)
print *,cshift(b, -4)
end program main
yields:
2 3 4 5 1
1 2 3 4 5
The first result (run-time) is correct.
I will fix this with my upcoming 8 patch for cshift, but it
will still be necessary to correct this on the previous branches.
Should be rather easy.
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Subject: [Bug fortran/83650] [7/8 Regression] Wrong simplification in cshift with negative shifts
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45689
[Bug 45689] [F03] Missing transformational intrinsic in the trans_func_f2003
list
>From gcc-bugs-return-587158-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:17:57 2018
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Subject: [Bug tree-optimization/83541] Missed optimization with int overflow
Date: Tue, 02 Jan 2018 15:17:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
I've deliberately avoided doing this ... (turning SSA propagator UNDEFINED
into a random value rather than keeping it effectively VARYING during
propagation/simplification stage). CCP is the only pass that even tries
to handle arithmetic with UNDEF somehow.
The case in question could be teached to both EVRP and DOM (you need those
conditional equivalences).
Note that our constant folding machinery simply computes stuff in twos
complement
as it lacks a way to say "undefined".
How useful would this be in practice? Apart from breaking some invalid code in
unexpected ways?
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Subject: [Bug rtl-optimization/83530] [8 Regression] ICE in reset_sched_cycles_in_current_ebb, at sel-sched.c:7150
Date: Tue, 02 Jan 2018 15:23:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-587159-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:23:17 2018
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Subject: [Bug ipa/83532] [8 Regression] ICE in apply_scale, at profile-count.h:955
Date: Tue, 02 Jan 2018 15:23:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-587161-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:26:38 2018
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Subject: [Bug target/83641] -fstack-clash-protection generates incorrect CFI on i386
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Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/83650] [6/7/8 Regression] Wrong simplification in cshift with negative shifts
Date: Tue, 02 Jan 2018 15:27:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Priority|P3 |P4
Known to work| |5.5.0
Summary|[7/8 Regression] Wrong |[6/7/8 Regression] Wrong
|simplification in cshift |simplification in cshift
|with negative shifts |with negative shifts
Known to fail| |6.4.0, 7.2.0, 8.0
--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Likely r230726 or r230832.
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Subject: [Bug rtl-optimization/83565] RTL combine pass breaks shift result (at least on ia64)
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
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--- Comment #26 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Investigating.
>From gcc-bugs-return-587163-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:28:38 2018
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Subject: [Bug rtl-optimization/83565] RTL combine pass breaks shift result (at least on ia64)
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--- Comment #25 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> I don't see the distinction here. Ia64 has instructions that operate on
> 32-bit values too, like cmp4.
The distinction is precisely what WORD_REGISTER_OPERATIONS conveys. On SPARC
and MIPS for example, for a 32-bit operation in 64-bit mode, the entire 64-bit
register is modified and the upper bits contain well defined bits.
> On sparc, given this testcase
> int
> sub (int i, int j, int k)
> {
> return i + j + k;
> }
> the compiler generates
> sub:
> add %o0, %o1, %o0
> add %o0, %o2, %o0
> jmp %o7+8
> sra %o0, 0, %o0
> Note that the add instruction operates on the entire 64-bit register, and
> after the first add, we no longer have a valid 32-bit value, because there
> might have been an overflow. This is why we need the sra at the end to
> sign-extend the return value, because we know that the upper 32-bits are
> don't care bits.
No, the upper bits are well defined by the SPARC-V9 architecture.
> If you take a paradoxical subreg of a SImode reg after an add instruction,
> you can't make any assumptions about the upper 32-bits of the value in the
> register. Exactly the same as ia64.
No, you know what the bits are on SPARC and MIPS for example if you know the
contents of the entire 64-bit register before the addition.
> I do see that the fact that sparc has 32-bit shift instructions defined
> means the testcase that fails on ia64 will not fail on sparc. But if we
> rely on that for the WORD_REGISTER_OPERATIONS definition, then it gets even
> messier than it already is.
I agree that we may need to do something for operations that don't have a clear
meaning when "extended" to the full work though.
Let me give it some thought...
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Jeffrey A. Law <law at redhat dot com> changed:
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>From gcc-bugs-return-587166-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:32:49 2018
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Subject: [Bug target/83641] -fstack-clash-protection generates incorrect CFI on i386
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--- Comment #2 from Jeffrey A. Law <law at redhat dot com> ---
Note this is specific to x86/x86_64 noreturn functions. No other targets are
potentially affected.
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From: "sergey.shalnov at intel dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/83008] [performance] Is it better to avoid extra instructions in data passing between loops?
Date: Tue, 02 Jan 2018 15:38:00 -0000
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--- Comment #20 from sergey.shalnov at intel dot com ---
Richard,
I did quick static analysis for your latest patch.
Using command line “-g -Ofast -mfpmath=sse -funroll-loops -march=znver1†your
latest patch
doesn’t affects the issue I discussed but it affects costs for first loop.
I thought the loop costs should be calculated in other place (tree-vect-loop.c)
but as I can see everything is interconnected.
The SLP block we discussed remains with the same statistic:
Vector inside of basic block cost: 64
Vector prologue cost: 32
Vector epilogue cost: 0
Scalar cost of basic block: 256
note: Basic block will be vectorized using SLP
First loop was:
note: Cost model analysis:.
Vector inside of loop cost: 5392
Vector prologue cost: 48
Vector epilogue cost: 0
Scalar iteration cost: 464
Scalar outside cost: 0
Vector outside cost: 48
prologue iterations: 0
epilogue iterations: 0
note: cost model: the vector iteration cost = 5392 divided by the scalar
iteration cost = 464 is greater or equal to the vectorization factor = 4.
Became:
note: Cost model analysis:
Vector inside of loop cost: 5392
Vector prologue cost: 192
Vector epilogue cost: 0
Scalar iteration cost: 464
Scalar outside cost: 0
Vector outside cost: 192
prologue iterations: 0
epilogue iterations: 0
note: cost model: the vector iteration cost = 5392 divided by the scalar
iteration cost = 464 is greater or equal to the vectorization factor = 4.
Sergey
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Subject: [Bug gcov-profile/47618] Collecting multiple profiles and using all for PGO
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--- Comment #19 from Petr Å paÄek <petr.spacek at nic dot cz> ---
Sure, I would be happy with any version, thank you!
For people who want to generate code coverage reports for parallel executions,
beware of https://github.com/linux-test-project/lcov/issues/37.
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Subject: [Bug target/83641] -fstack-clash-protection generates incorrect CFI on i386
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--- Comment #3 from Jeffrey A. Law <law at redhat dot com> ---
So the issue here is when we have a noreturn function we use a push/pop
sequence to probe the top of the stack.
The generic dwarf2 CFI bits interpret the pop as restoring the value of the
popped register. But that's not strictly correct if the register is also
callee-saved (which implies that it'll be set later by the body of the
function).
Of course the push/pop sequence is not needed in this case since the callee
register save acts as a probe. This is a known, relatively minor,
inefficiency.
The good news is the bogus CFI issue is a strict subset of the performance
issue and thus if we fix the performance issue, the codegen issue gets resolved
at the same time. I expect to have this fixed within the next couple hours.
>From gcc-bugs-return-587170-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 15:49:06 2018
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Subject: [Bug c++/83644] ICE using type alias from recursive decltype in noexcept or return type
Date: Tue, 02 Jan 2018 15:49:00 -0000
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Reduced to:
namespace std {
template <typename> bool is_invocable_v;
}
template <typename F> auto compose(F) {
[](auto... objs) noexcept(std::is_invocable_v<decltype(objs)...>){};
}
auto f() { compose(3); }
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Subject: [Bug c++/83592] [8 Regression] Annoying -Wparentheses warnings
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-02
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r253446.
>From gcc-bugs-return-587172-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 16:22:57 2018
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Subject: [Bug fortran/83650] [6/7/8 Regression] Wrong simplification in cshift with negative shifts
Date: Tue, 02 Jan 2018 16:22:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|7.4 |6.5
--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Patch for gcc-7:
Index: fortran/simplify.c
===================================================================
--- fortran/simplify.c (Revision 256009)
+++ fortran/simplify.c (Arbeitskopie)
@@ -1991,7 +1991,9 @@ gfc_simplify_cshift (gfc_expr *array, gfc_expr *sh
mpz_clear (size);
/* Adjust shft to deal with right or left shifts. */
- shft = shft < 0 ? 1 - shft : shft;
+ shft = shft % sz;
+ if (shft < 0)
+ shft += sz;
/* Special case: Shift to the original order! */
if (sz == 0 || shft % sz == 0)
Index: testsuite/gfortran.dg/simplify_cshift_1.f90
===================================================================
--- testsuite/gfortran.dg/simplify_cshift_1.f90 (Revision 256009)
+++ testsuite/gfortran.dg/simplify_cshift_1.f90 (Arbeitskopie)
@@ -23,12 +23,12 @@ program foo
v = cshift(c, 2)
if (any(b /= v)) call abort
- ! Special cases shift = 0, size(a), 1-size(a)
+ ! Special cases shift = 0, size(a), size(a)
b = cshift([1, 2, 3, 4, 5], 0)
if (any(b /= a)) call abort
b = cshift([1, 2, 3, 4, 5], size(a))
if (any(b /= a)) call abort
- b = cshift([1, 2, 3, 4, 5], 1-size(a))
+ b = cshift([1, 2, 3, 4, 5], -size(a))
if (any(b /= a)) call abort
! simplification of array arg.
>From gcc-bugs-return-587173-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 17:00:29 2018
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Subject: [Bug tree-optimization/83651] New: [7.2 regression] 20% slowdown of linux kernel AES cipher
Date: Tue, 02 Jan 2018 17:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83651
Bug ID: 83651
Summary: [7.2 regression] 20% slowdown of linux kernel AES
cipher
Product: gcc
Version: 7.2.1
Status: UNCONFIRMED
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Target Milestone: ---
Following the discussion on PR83356, I did some more performance analysis of
the AES code with various compiler versions, by running the in-kernel crypto
selftest (kvm -kernel linux/arch/x86/boot/bzImage -append "tcrypt.mode=200
tcrypt.sec=1 console=ttyS0" -nographic -serial mon:stdio), which showed a very
clear slowdown at gcc-7.2 (dated 20171130) compared to 7.1, all numbers are in
cycles/byte for AES256+CBC on a 3.1GHz AMD Threadripper, lower numbers are
better:
default ubsan patched patched+ubsan
gcc-4.3.6 -O2 14.9 ---- 14.9 ----
gcc-4.6.4 -O2 15.0 ---- 15.8 ----
gcc-4.9.4 -O2 15.5 20.7 15.9 20.9
gcc-5.5.0 -O2 15.6 47.3 86.4 48.8
gcc-6.3.1 -O2 14.6 49.4 94.3 50.9
gcc-7.1.1 -O2 13.5 54.6 15.2 52.0
gcc-7.2.1 -O2 16.8 124.7 92.0 52.2
gcc-8.0.0 -O2 14.6 56.6 15.3 53.5
gcc-7.1.1 -O1 14.6 53.8
gcc-7.2.1 -O1 15.5 55.9
gcc-8.0.0 -O1 15.0 50.7
clang-5 -O1 21.7 58.3
clang-5 -O2 15.5 49.1
handwritten asm 16.4
The 'patched' columns are with '-ftree-pre and -ftree-sra' disabled in the
sources, which happened to help on gcc-7.2.1 for performance and to work around
PR83356 but made things worse for most other cases.
For better reproducibility, I tried doing the same with the libressl
implementation of the same cipher, which also has interesting but unfortunately
very different results:
gcc-5.5.0 -O2 49.0
gcc-6.3.1 -O2 48.8
gcc-7.1.1 -O2 59.7
gcc-7.2.1 -O2 60.3
gcc-8.0.0 -O2 59.6
gcc-5.5.0 -O1 59.5
gcc-6.3.1 -O1 48.5
gcc-7.1.1 -O1 51.6
gcc-7.2.1 -O1 51.6
gcc-8.0.0 -O1 51.6
The source code is apparently derived from a common source, but has evolved in
different ways, and the version from the kernel appears to be much faster
overall. In both cases, we see a ~20% degradation between gcc-6.3.1 and
gcc-7.2.1, but gcc-7.1.1 happens to produce the best results for the kernel
version and very bad results for the libressl sources. The stack consumption
problem from PR83356 does not appear with the libressl sources. I have not
managed to run a ubsan-enabled libressl binary for testing.
To put this in context, both libressl and Linux come with architecture-specific
versions using SIMD registers for most architectures, and those tend to be much
faster, but the C version is used on old x86 CPUs and minor architectures that
lack SIMD registers or an AES implementation for them.
If there is enough interest in addressing the slowdown, it should be possible
to create a version of the kernel AES implementation that can be run in user
space, as the current method of reproducing the results is fairly tedious.
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Subject: [Bug c++/83644] ICE using type alias from recursive decltype in noexcept or return type
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--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Jan 2 17:02:14 2018
New Revision: 256082
URL: https://gcc.gnu.org/viewcvs?rev=256082&root=gcc&view=rev
Log:
PR c++/83644
* g++.dg/cpp1z/pr83644.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp1z/pr83644.C
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/82190] Possibly latent miscompilation issue on ppc64le-linux-gnu for memcpy-bi.c with -fweb -fno-optimize-strlen
Date: Tue, 02 Jan 2018 17:02:00 -0000
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--- Comment #5 from acsawdey at gcc dot gnu.org ---
Author: acsawdey
Date: Tue Jan 2 17:02:17 2018
New Revision: 256083
URL: https://gcc.gnu.org/viewcvs?rev=256083&root=gcc&view=rev
Log:
Add missing changelog entry:
2017-12-12 Aaron Sawdey <acsawdey@linux.vnet.ibm.com>
PR target/82190
* config/rs6000/rs6000-string.c (expand_block_compare,
expand_strn_compare): Fix set_mem_size() calls.
Modified:
trunk/gcc/ChangeLog
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Subject: [Bug c++/83644] ICE using type alias from recursive decltype in noexcept or return type
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |FIXED
--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-587177-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 17:22:09 2018
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Subject: [Bug other/83497] CPU2000 172.mgrid starts failing with r254730
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--- Comment #3 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
>
> As far as I see the miscompare is -0.8 vs. 0.18 so it doesn't look like a
> precision issue to me. Does it only happen for power6 / bigendian?
>
Yes, the failure is only for -mcpu=power6. I don't have a copy of CPU2000 that
runs on powerpc64le, so can't say for sure if it's a big endian issue only.
I will do some further digging on the failure.
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Subject: [Bug c++/83592] [8 Regression] Annoying -Wparentheses warnings
Date: Tue, 02 Jan 2018 17:38:00 -0000
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
IOW:
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -10866,10 +10866,11 @@ grokdeclarator (const cp_declarator *declarator,
inner_declarator = declarator->declarator;
- /* We don't want to warn in parmeter context because we don't
+ /* We don't want to warn in parameter context because we don't
yet know if the parse will succeed, and this might turn out
to be a constructor call. */
if (decl_context != PARM
+ && decl_context != TYPENAME
&& declarator->parenthesized != UNKNOWN_LOCATION
/* If the type is class-like and the inner name used a
global namespace qualifier, we need the parens.
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Subject: [Bug c++/83592] [8 Regression] Annoying -Wparentheses warnings
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I'm wondering if simply disabling the warning in TYPENAME would make sense (it
suppresses the warning).
>From gcc-bugs-return-587180-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 17:41:33 2018
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Subject: [Bug rtl-optimization/83565] [7/8 regression] RTL combine pass breaks shift result (at least on ia64)
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Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |law at redhat dot com
--- Comment #27 from Jeffrey A. Law <law at redhat dot com> ---
WORD_REGISTER_OPERATIONS says the operations in integral modes smaller than a
word are performed on the entire register (ie a word).
I think WORD_REGISTER_OPERATIONS is fairly intuitive when it comes to
arithmetic and logicals. For arith/logicals I would find myself agreeing with
Eric in c#25.
However, I think it's not as clear for shifts/rotates.
On the PA (which defines WORD_REGISTER_OPERATIONS) we have 32bit
deposit/extract which are used for various shifts. The 32bit extract/deposit
instructions set the low 32 bits in the expected way, but leave the upper bits
undefined. So I suspect PA and IA-64 have similar behavior (big surprise).
One could argue that WORD_REGISTER_OPERATIONS should apply to just arith and
logicals. One could also argue that it should apply to shifts in which case
ports like the PA and IA-64 probably shouldn't define WORD_REGISTER_OPERATIONS.
If we were to argue that WORD_REGISTER_OPERATIONS should apply to just
arith/logicals, then the PA would need to be audited for cases where we might
implement an arith operation using shifts (deposit/extract instructions).
And just to be clear here. I don't think the PA or IA-64 ought to drive
decisions in this area. They're both dead architectures -- but others may have
similar properties.
Note none of this touches on what are the high bits of a paradoxical subreg,
which are undefined in RTL. So I'm in partial agreement with Jim c#11 as well.
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Subject: [Bug libfortran/83649] Large reads fail
Date: Tue, 02 Jan 2018 17:51:00 -0000
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-01-02
Ever confirmed|0 |1
--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Should it be marked as ASSIGNED? IMO worth a back port (otherwise it should be
closed as FIXED).
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Subject: [Bug fortran/83650] [6/7/8 Regression] Wrong simplification in cshift with negative shifts
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--- Comment #3 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Tue Jan 2 17:51:26 2018
New Revision: 256084
URL: https://gcc.gnu.org/viewcvs?rev=256084&root=gcc&view=rev
Log:
2018-01-02 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/45689
PR fortran/83650
* simplify.c (gfc_simplify_cshift): Re-implement to allow full
range of arguments.
2018-01-02 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/45689
PR fortran/83650
* gfortran.dg/simplify_cshift_1.f90: Correct erroneous case.
* gfortran.dg/simplify_cshift_4.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/simplify_cshift_4.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/simplify.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/simplify_cshift_1.f90
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Subject: [Bug fortran/45689] [F03] Missing transformational intrinsic in the trans_func_f2003 list
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--- Comment #16 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Tue Jan 2 17:51:26 2018
New Revision: 256084
URL: https://gcc.gnu.org/viewcvs?rev=256084&root=gcc&view=rev
Log:
2018-01-02 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/45689
PR fortran/83650
* simplify.c (gfc_simplify_cshift): Re-implement to allow full
range of arguments.
2018-01-02 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/45689
PR fortran/83650
* gfortran.dg/simplify_cshift_1.f90: Correct erroneous case.
* gfortran.dg/simplify_cshift_4.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/simplify_cshift_4.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/simplify.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/simplify_cshift_1.f90
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Subject: [Bug other/83497] CPU2000 172.mgrid starts failing with r254730
Date: Tue, 02 Jan 2018 17:59:00 -0000
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--- Comment #4 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
(In reply to Pat Haugen from comment #0)
> mgrid started failing (output miscompare) with r254730. The following
> options demonstrate the failure "-O3 -mcpu=power6 -ffast-math".
Incomplete option set, -m32 is also required.
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Subject: [Bug fortran/83650] [6/7/8 Regression] Wrong simplification in cshift with negative shifts
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83650
--- Comment #4 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Tue Jan 2 18:01:31 2018
New Revision: 256085
URL: https://gcc.gnu.org/viewcvs?rev=256085&root=gcc&view=rev
Log:
2018-01-02 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/83650
* simplify.c (gfc_simplify_cshift): Correct contition for
negative shifts.
2018-01-02 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/83650
* gfortran.dg/simplify_cshift_1.f90: Correct condition.
Modified:
branches/gcc-7-branch/gcc/fortran/ChangeLog
branches/gcc-7-branch/gcc/fortran/simplify.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
branches/gcc-7-branch/gcc/testsuite/gfortran.dg/simplify_cshift_1.f90
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/83556] [7/8 Regression] ICE in gimplify_expr, at gimplify.c:12004
Date: Tue, 02 Jan 2018 18:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83556
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Jan 2 18:04:19 2018
New Revision: 256086
URL: https://gcc.gnu.org/viewcvs?rev=256086&root=gcc&view=rev
Log:
PR c++/83556
* tree.c (replace_placeholders_r): Pass NULL as last argument to
cp_walk_tree instead of d->pset. If non-TREE_CONSTANT and
non-PLACEHOLDER_EXPR tree has been seen already, set *walk_subtrees
to false and return.
(replace_placeholders): Pass NULL instead of &pset as last argument
to cp_walk_tree.
* g++.dg/cpp0x/pr83556.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/pr83556.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/tree.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/83556] [7/8 Regression] ICE in gimplify_expr, at gimplify.c:12004
Date: Tue, 02 Jan 2018 18:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83556
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Jan 2 18:07:41 2018
New Revision: 256087
URL: https://gcc.gnu.org/viewcvs?rev=256087&root=gcc&view=rev
Log:
PR c++/83556
* tree.c (replace_placeholders_r): Pass NULL as last argument to
cp_walk_tree instead of d->pset. If non-TREE_CONSTANT and
non-PLACEHOLDER_EXPR tree has been seen already, set *walk_subtrees
to false and return.
(replace_placeholders): Pass NULL instead of &pset as last argument
to cp_walk_tree.
* g++.dg/cpp0x/pr83556.C: New test.
Added:
branches/gcc-7-branch/gcc/testsuite/g++.dg/cpp0x/pr83556.C
Modified:
branches/gcc-7-branch/gcc/cp/ChangeLog
branches/gcc-7-branch/gcc/cp/tree.c
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/45689] [F03] Missing transformational intrinsic in the trans_func_f2003 list
Date: Tue, 02 Jan 2018 18:14:00 -0000
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--- Comment #17 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Tue Jan 2 18:14:04 2018
New Revision: 256088
URL: https://gcc.gnu.org/viewcvs?rev=256088&root=gcc&view=rev
Log:
2017-01-02 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/45689
* intrinsic.c (add_function): Add gfc_simplify_maxloc and
gfc_simplify_minloc to maxloc and minloc, respectively.
* intrinsic.h: Add prototypes for gfc_simplify_minloc
and gfc_simplify_maxloc.
* simplify.c (min_max_chose): Adjust prototype. Modify function
to have a return value which indicates if the extremum was found.
(is_constant_array_expr): Fix typo in comment.
(simplify_minmaxloc_to_scalar): New function.
(simplify_minmaxloc_nodim): New function.
(new_array): New function.
(simplify_minmaxloc_to_array): New function.
(gfc_simplify_minmaxloc): New function.
(simplify_minloc): New function.
(simplify_maxloc): New function.
2017-01-02 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/45689
* gfortran.dg/minloc_4.f90: New test case.
* gfortran.dg/maxloc_4.f90: New test case.
Added:
trunk/gcc/testsuite/gfortran.dg/maxloc_4.f90
trunk/gcc/testsuite/gfortran.dg/minloc_4.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/intrinsic.c
trunk/gcc/fortran/intrinsic.h
trunk/gcc/fortran/simplify.c
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Subject: [Bug c++/83652] New: template substitution fails on operator
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Bug ID: 83652
Summary: template substitution fails on operator
Product: gcc
Version: 5.2.0
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Priority: P3
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Created attachment 43008
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43008&action=edit
testcase
template substitution failure in the attached code resulting in following
error:
test.cpp: In function ‘int main()’:
test.cpp:34:4: error: invalid conversion from ‘int’ to ‘Enum_t’ [-fpermissive]
b ^= somedef;
Also broken in gcc 6.2.0
This code is confirmed to be working with clang+ and VS++15.
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Subject: [Bug preprocessor/83602] [8 Regression] ICE in cpp_macro_definition_location(cpp_hashnode*) on invalid code
Date: Tue, 02 Jan 2018 18:41:00 -0000
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--- Comment #3 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Sorry about the breakage.
Patch looks reasonable to me. Maybe cpp_macro_definition_location should gain
an assertion that CPP_HASHNODE_VALUE_IDX (node) == NTV_MACRO ?
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From: "matthew at wil dot cx" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/83653] New: GCC fails to remove a can't-happen call on ia64
Date: Tue, 02 Jan 2018 19:04:00 -0000
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Bug ID: 83653
Summary: GCC fails to remove a can't-happen call on ia64
Product: gcc
Version: 6.4.0
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Created attachment 43009
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43009&action=edit
Gzipped preprocessed source
This is an excerpt from the Linux kernel, with some patches that I'm preparing
to go in. The 0day build-bot reports a problem with an undefined
__bad_increment_for_ia64_fetch_and_add.
I can reproduce the problem by taking the attached preprocessed source and
compiling it with gcc -O2 -o shmem.o -c shmem.i and then running nm shmem.o
|grep __bad
Manually inlining page_ref_sub() in the included test-case makes the problem go
away, as does simply deleting the call to page_ref_sub() (at line 50756).
Command line: gcc -Wp,-MD,mm/.shmem.o.d -nostdinc -isystem
/usr/lib/gcc/ia64-linux-gnu/4.6/include -I./arch/ia64/include
-I./arch/ia64/include/generated -I./include -I./arch/ia64/include/uapi
-I./arch/ia64/include/generated/uapi -I./include/uapi
-I./include/generated/uapi -include ./include/linux/kconfig.h -D__KERNEL__
-DHAVE_WORKING_TEXT_ALIGN -DHAVE_MODEL_SMALL_ATTRIBUTE
-DHAVE_SERIALIZE_DIRECTIVE -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs
-fno-strict-aliasing -fno-common -fshort-wchar
-Werror-implicit-function-declaration -Wno-format-security -std=gnu89
-Wno-unused-but-set-variable -fno-PIE -pipe -ffixed-r13
-mfixed-range=f12-f15,f32-f127 -falign-functions=32 -frename-registers
-fno-optimize-sibling-calls -fno-delete-null-pointer-checks -O2
-DCC_HAVE_ASM_GOTO -Wframe-larger-than=2048 -fno-stack-protector
-fomit-frame-pointer -fno-var-tracking-assignments -g
-Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow
-fno-stack-check -fconserve-stack -Werror=implicit-int
-Werror=strict-prototypes -Werror=date-time -Werror=incompatible-pointer-types
-Werror=designated-init -mconstant-gp -DKBUILD_BASENAME='"shmem"'
-DKBUILD_MODNAME='"shmem"' -c -o mm/.tmp_shmem.o mm/shmem.c
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From: "jb at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/83649] Large reads fail
Date: Tue, 02 Jan 2018 19:09:00 -0000
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Janne Blomqvist <jb at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |jb at gcc dot gnu.org
--- Comment #4 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Yes, assigning to myself. So it works on macOS. Did you also test whether it
fails without the patch?
It'd be nice to have some test results on win64 as well, but I guess we have
noone to run those. At least with the patch it shouldn't be worse than with
trunk.
Another question is whether the current value of MAX_CHUNK is optimal, or
whether some smaller value might be better..
>From gcc-bugs-return-587193-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 19:21:02 2018
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Subject: [Bug middle-end/61118] [6/7/8 Regression] Indirect call generated for pthread_cleanup_push with constant cleanup function
Date: Tue, 02 Jan 2018 19:21:00 -0000
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--- Comment #19 from Jeffrey A. Law <law at redhat dot com> ---
Note you lost the regression marker when this was made a duplicate of 21161.
So it's unlikely anyone would have looked at it until the next release cycle.
My understanding from Florian is that at least some of the issues here are
regressions, so I've added the marker to 21161.
>From gcc-bugs-return-587194-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 19:22:06 2018
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Subject: [Bug middle-end/83654] New: -fstack-clash-protection probes below the stack pointer for VLA with constant size
Date: Tue, 02 Jan 2018 19:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83654
Bug ID: 83654
Summary: -fstack-clash-protection probes below the stack
pointer for VLA with constant size
Product: gcc
Version: 8.0
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Created attachment 43010
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43010&action=edit
const-vla.c
On i386, the reproducer compiles to:
f2:
.LFB0:
.cfi_startproc
pushl %ebp
.cfi_def_cfa_offset 8
.cfi_offset 5, -8
movl %esp, %ebp
.cfi_def_cfa_register 5
subl $8, %esp
leal -4096(%esp), %eax
cmpl %eax, %esp
je .L5
.L7:
subl $4096, %esp
orl $0, 4092(%esp)
cmpl %eax, %esp
jne .L7
.L5:
orl $0, -4(%esp)
The final probe accesses memory below the stack pointer. i386 does not have a
red zone, so this results in a valgrind warning:
==375071== Invalid read of size 4
==375071== at 0x80482EE: main (in /root/build-32/a.out)
==375071== Address 0xfeb83d0c is on thread 1's stack
==375071== 4 bytes below stack pointer
I don't think this issue is observable without valgrind, so the severity is
low. However, it affects glibc's getaddrinfo implementation, so it seems
worthwhile addressing this.
The issue might not be target-specific. x86-64 results in similar code, but
valgrind won't warn because of the red zone.
>From gcc-bugs-return-587195-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 19:26:05 2018
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Subject: [Bug middle-end/83654] -fstack-clash-protection probes below the stack pointer for VLA with constant size
Date: Tue, 02 Jan 2018 19:26:00 -0000
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--- Comment #1 from Florian Weimer <fw at gcc dot gnu.org> ---
I forgot to mention that I used “-O2 -fstack-clash-protectionâ€, but there's a
valgrind warning with -O0, too.
>From gcc-bugs-return-587196-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 19:27:32 2018
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Subject: [Bug c/83586] [8 regression] Invalid -Wformat-truncation on stdio2.h
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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 -Wformat-truncation warning relies on optimization to detect sizes and
ranges of sprintf arguments. As optimizations improve the warning will detect
more instances of possible overflows.
I don't know what the source code looks like (we ask for a preprocessing
translation unit to reproduce errors) but the text of the warning suggests that
snprintf is being called to format a string of an unknown length stored in an
array of 128 chars into a buffer that has at most 126 bytes of space left,
allowing for the function to truncate the directive's output. Below is a test
case that reproduces a similar warning with GCC 8. GCC 7 doesn't diagnose it
because of bug 79538. The solution to avoid the warning is to either a)
provide a buffer of sufficient size, or b) constrain the length of the string
argument to the %s directive to avoid the possible truncation, or c) handle the
truncation by using the snprintf return value to take some action (something
GCC doesn't optimize away).
Please either confirm whether this is what's going on in LinuxGamepad.cpp or
provide a preprocessing translation unit of the file that reproduces the
warning so it can be analyzed.
$ cat d.c && gcc -O2 -S -Wall -Wextra d.c
void f (char *d, unsigned long x)
{
extern char a[128];
x >>= 4;
__builtin_snprintf (d, 128, "%lx %s", x, a);
}
d.c: In function ‘f’:
d.c:7:36: warning: ‘%s’ directive output may be truncated writing up to 127
bytes into a region of size between 112 and 126 [-Wformat-truncation=]
__builtin_snprintf (d, 128, "%lx %s", x, a);
^~ ~
d.c:7:3: note: ‘__builtin_snprintf’ output between 3 and 144 bytes into a
destination of size 128
__builtin_snprintf (d, 128, "%lx %s", x, a);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>From gcc-bugs-return-587198-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 19:35:34 2018
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Subject: [Bug middle-end/83654] -fstack-clash-protection probes below the stack pointer for VLA with constant size
Date: Tue, 02 Jan 2018 19:35:00 -0000
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--- Comment #2 from Florian Weimer <fw at gcc dot gnu.org> ---
I forgot to add a compiler barrier to f2 for the executable test case, so it is
not strictly equivalent.
With it, valgrind reports:
==375147== Invalid read of size 4
==375147== at 0x8048403: f2 (in /root/build-32/a.out)
==375147== by 0x80482CA: main (in /root/build-32/a.out)
==375147== Address 0xfebb3d0c is on thread 1's stack
==375147== 4 bytes below stack pointer
valgrind warns about the final probe. Here's the disassembly with addresses:
080483e0 <f2>:
80483e0: 55 push %ebp
80483e1: 89 e5 mov %esp,%ebp
80483e3: 83 ec 08 sub $0x8,%esp
80483e6: 8d 84 24 00 f0 ff ff lea -0x1000(%esp),%eax
80483ed: 39 c4 cmp %eax,%esp
80483ef: 74 12 je 8048403 <f2+0x23>
80483f1: 81 ec 00 10 00 00 sub $0x1000,%esp
80483f7: 83 8c 24 fc 0f 00 00 orl $0x0,0xffc(%esp)
80483fe: 00
80483ff: 39 c4 cmp %eax,%esp
8048401: 75 ee jne 80483f1 <f2+0x11>
8048403: 83 4c 24 fc 00 orl $0x0,-0x4(%esp)
8048408: 83 ec 0c sub $0xc,%esp
804840b: 50 push %eax
804840c: e8 bf ff ff ff call 80483d0 <f1>
8048411: c9 leave
8048412: c3 ret
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Subject: [Bug libfortran/83649] Large reads fail
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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--- Comment #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Yes, assigning to myself. So it works on macOS. Did you also test whether
> it fails without the patch?
Yes, it did fail without the patch.
> Another question is whether the current value of MAX_CHUNK is optimal,
> or whether some smaller value might be better.
First I feared that MAX_CHUNK was too large by one, but this was not the case.
>From gcc-bugs-return-587199-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 20:02:59 2018
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Subject: [Bug tree-optimization/83541] Missed optimization with int overflow
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--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #3)
> I've deliberately avoided doing this ... (turning SSA propagator UNDEFINED
> into a random value rather than keeping it effectively VARYING during
> propagation/simplification stage). CCP is the only pass that even tries
> to handle arithmetic with UNDEF somehow.
>
> The case in question could be teached to both EVRP and DOM (you need those
> conditional equivalences).
I am not sure if we can handle uninitialized variables and impossible values
(result of an overflow) together, they don't have the same properties. (I am
not saying that is what you suggested, just that I am too confused about UNDEF)
> Note that our constant folding machinery simply computes stuff in twos
> complement as it lacks a way to say "undefined".
The constant stuff has TREE_OVERFLOW. We usually drop_tree_overflow, but for
instance gimple_resimplify* could insert __builtin_unreachable() in seq (or
something similar if having __builtin_unreachable in the middle of a bb causes
trouble). Of course, important passes would then ignore this folding because
they don't want any extra insn :-( Maybe a way to say impossible would be nice,
I don't know if reusing error_mark_node would make sense.
> How useful would this be in practice? Apart from breaking some invalid code
> in unexpected ways?
I don't believe the breaking would be particularly bad. We already exploit the
same information in VRP, it just shows up in different forms, sometimes by
letting you fold a condition, other times by creating an empty range, and it is
quite inconsistent to exploit it in one case and not the other. Replacing an
empty range with an arbitrary singleton as we do likely already breaks some
invalid code, and replacing an empty range with varying has the weird effect
that a tighter range gives less optimizations than a wider range.
__builtin_unreachable() often back-propagates a bit through trivial statements
and removes a branch, or reduces a PHI. The threader cannot handle everything.
Of course, it is hard to guess the true impact... I hit the VR_EMPTY case
regularly, but there is a strong bias in the code I look at ;-)
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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/83655] New: [8 Regression] ICE on an invalid call to memcpy declared with no prototype
Date: Tue, 02 Jan 2018 20:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83655
Bug ID: 83655
Summary: [8 Regression] ICE on an invalid call to memcpy
declared with no prototype
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
When mecmpy() or strncpy() (and possibly other built-in functions) is declared
without a prototype and called with arguments of the wrong types GCC crashes in
the -Wrestrict pass. This is a similar but not exactly the same problem as bug
83603 which points out a crash due to a call with an insufficient number of
arguments.
$ cat d.c && gcc -O2 -S -Wall d.c
void* memcpy ();
void f (void)
{
memcpy (1, 2, "");
}
during GIMPLE pass: wrestrict
d.c: In function ‘f’:
d.c:3:6: internal compiler error: Segmentation fault
void f (void)
^
0xfcd34d crash_signal
/ssd/src/gcc/git/gcc/toplev.c:325
0x7ada8a contains_struct_check(tree_node const*, tree_node_structure_enum, char
const*, int, char const*)
/ssd/src/gcc/git/gcc/tree.h:3497
0x926f06 wi::extended_tree<128>::extended_tree(tree_node const*)
/ssd/src/gcc/git/gcc/tree.h:5443
0x925d0d generic_wide_int<wi::extended_tree<128> >::generic_wide_int<tree_node
const*>(tree_node const* const&)
/ssd/src/gcc/git/gcc/wide-int.h:749
0x9258f2 wi::to_offset(tree_node const*)
/ssd/src/gcc/git/gcc/tree.h:5395
0xbfdfe3 builtin_memref
/ssd/src/gcc/git/gcc/gimple-ssa-warn-restrict.c:393
0xc04286 check_bounds_or_overlap(gcall*, tree_node*, tree_node*, tree_node*,
tree_node*, bool)
/ssd/src/gcc/git/gcc/gimple-ssa-warn-restrict.c:1720
0xc041a0 check_call
/ssd/src/gcc/git/gcc/gimple-ssa-warn-restrict.c:1691
0xbfd0a6 before_dom_children
/ssd/src/gcc/git/gcc/gimple-ssa-warn-restrict.c:106
0x1b6127f dom_walker::walk(basic_block_def*)
/ssd/src/gcc/git/gcc/domwalk.c:308
0xbfd12a execute
/ssd/src/gcc/git/gcc/gimple-ssa-warn-restrict.c:120
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-587201-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 20:10:38 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83655] [8 Regression] ICE on an invalid call to memcpy declared with no prototype
Date: Tue, 02 Jan 2018 20:10:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-01-02
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=83603
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
Ever confirmed|0 |1
>From gcc-bugs-return-587202-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 20:34:16 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/83656] New: missing -Wbuiltin-declaration-mismatch on declaration without prototype
Date: Tue, 02 Jan 2018 20:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83656
Bug ID: 83656
Summary: missing -Wbuiltin-declaration-mismatch on declaration
without prototype
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
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G++ issues a -Wbuiltin-declaration-mismatch for the memcpy declaration in the
test case below but GCC does not. Since -Wstrict-prototypes is disabled by
default even in pedantic mode (see bug 82922) this makes it easy to overlook
such declarations in source code and miss invalid calls to them as in the
following test case:
$ cat d.c && gcc -O2 -S -Wall -Wextra -Wpedantic d.c
#if __cplusplus
extern "C" void* memcpy (...);
#else
void* memcpy ();
#endif
void f (char *d)
{
memcpy (3, d, "123");
}
>From gcc-bugs-return-587203-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 20:40:56 2018
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Subject: [Bug tree-optimization/83657] New: detect invalid calls to built-ins declared without prototype
Date: Tue, 02 Jan 2018 20:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83657
Bug ID: 83657
Summary: detect invalid calls to built-ins declared without
prototype
Product: gcc
Version: 8.0
Status: UNCONFIRMED
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As pointed out in bug 83656, GCC (in C mode) fails to issue
-Wbuiltin-declaration-mismatch for the not-entirely-compatible memcpy
declaration with no prototype in the test case below. This makes it possible
to not just overlook such declarations in source code but also miss invalid
calls to them as in the following test case.
Independent of the fix for bug 83656, this is a request to also detect and
diagnose such invalid calls, similarly to how Clang diagnoses them.
$ cat d.c && gcc -O2 -S -Wall -Wextra -Wpedantic d.c
#if __cplusplus
extern "C" void* memcpy (...);
#else
void* memcpy ();
#endif
void f (char *d)
{
memcpy (3, d, "123"); // invalid, should be diagnosed
}
For reference, Clang issues the following warnings:
d.c:5:11: warning: incompatible integer to pointer conversion passing 'int' to
parameter of type 'void *' [-Wint-conversion]
memcpy (3, d, "123");
^
d.c:5:17: warning: incompatible pointer to integer conversion passing 'char
[4]' to parameter of type 'unsigned long' [-Wint-conversion]
memcpy (3, d, "123");
^~~~~
2 warnings generated.
>From gcc-bugs-return-587204-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 21:54:44 2018
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Subject: [Bug preprocessor/83173] C preprocessor generates incorrect linemarkers
Date: Tue, 02 Jan 2018 21:54:00 -0000
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org
--- Comment #4 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(In reply to Jeffrey A. Law from comment #3)
> Adding David who knows the linemap bits.
>
> David -- Mike has also posted a patch. See gcc-patches archives Dec 1.
https://gcc.gnu.org/ml/gcc-patches/2017-12/msg00073.html
>From gcc-bugs-return-587205-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 22:46:23 2018
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From: "slyfox at inbox dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/83565] [7/8 regression] RTL combine pass breaks shift result (at least on ia64)
Date: Tue, 02 Jan 2018 22:46:00 -0000
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--- Comment #28 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Thanks all for very insightful comments and sorting out
WORD_REGISTER_OPERATIONS ambiguity! I've understood quite a bit on how RTL does
it's magic.
I still have a few related questions to clarify things:
1. Is it directly visible for you from RTL dumps which bits GCC assumes as
non-zero or you just know RTL invariants? I had to patch gcc locally to verify
RTL prediction by adding printfs into print_pattern to get the idea how it
works:
insn_cost 4 for 20: [r347:DI]=<nz_bits(set)=0x800000>r354:DI#0
insn_cost 4 for 21: r357:SI=<nz_bits(set)=0x1>r343:SI<-<0x1
2. Does gcc have any validation mode that could have caught this error after
code generation and checking against RTL invariant?
>From gcc-bugs-return-587206-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 23:03:48 2018
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Subject: [Bug fortran/83650] [6/7/8 Regression] Wrong simplification in cshift with negative shifts
Date: Tue, 02 Jan 2018 23:03:00 -0000
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--- Comment #5 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Tue Jan 2 23:03:11 2018
New Revision: 256113
URL: https://gcc.gnu.org/viewcvs?rev=256113&root=gcc&view=rev
Log:
2018-01-02 Thomas Koenig <tkoenig@gcc.gnu.org>
Backport from 7-branch
PR fortran/83650
* simplify.c (gfc_simplify_cshift): Correct contition for
negative shifts.
2018-01-02 Thomas Koenig <tkoenig@gcc.gnu.org>
Backport from 7-branch
PR fortran/83650
* gfortran.dg/simplify_cshift_1.f90: Correct condition.
Modified:
branches/gcc-6-branch/gcc/fortran/ChangeLog
branches/gcc-6-branch/gcc/fortran/simplify.c
branches/gcc-6-branch/gcc/testsuite/ChangeLog
branches/gcc-6-branch/gcc/testsuite/gfortran.dg/simplify_cshift_1.f90
>From gcc-bugs-return-587207-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 23:04:46 2018
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Subject: [Bug fortran/83650] [6/7/8 Regression] Wrong simplification in cshift with negative shifts
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83650
Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Fixed on all open branches, closing.
>From gcc-bugs-return-587208-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 23:04:47 2018
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Subject: [Bug fortran/45689] [F03] Missing transformational intrinsic in the trans_func_f2003 list
Date: Tue, 02 Jan 2018 23:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45689
Bug 45689 depends on bug 83650, which changed state.
Bug 83650 Summary: [6/7/8 Regression] Wrong simplification in cshift with negative shifts
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83650
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----------------------------------------------------------------------------
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>From gcc-bugs-return-587209-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 23:06:01 2018
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Subject: [Bug tree-optimization/83655] [8 Regression] ICE on an invalid call to memcpy declared with no prototype
Date: Tue, 02 Jan 2018 23:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83655
Martin Sebor <msebor at gcc dot gnu.org> changed:
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--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00082.html
>From gcc-bugs-return-587210-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 23:22:21 2018
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From: "cohenjon at google dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/83658] New: any::emplace deletes invalid memory when an overloaded operator new() throws
Date: Tue, 02 Jan 2018 23:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83658
Bug ID: 83658
Summary: any::emplace deletes invalid memory when an overloaded
operator new() throws
Product: gcc
Version: 8.0
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Priority: P3
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Note the following Wandbox: https://wandbox.org/permlink/1emVGP0a09lmd4g2 --
the std::any is still empty after new() throws and so the destructor should be
a no-op. Instead it calls delete().
__do_emplace sets the manager pointer before attempting to create a new object.
When new() throws after calling reset(), _M_ptr doesn't point to valid memory.
When, later, the destructor is called on the any, the manager pointer still is
non-null, so the destructor, via reset(), will trigger the call to
_S_manage(_Op_destroy, ...), calling delete on the invalid _M_ptr.
I believe setting the manager pointer after calling _S_create() will fix the
issue, since the manager pointer will still be null after _S_create_ propagates
the exception.
>From gcc-bugs-return-587211-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 23:27:20 2018
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From: "su at cs dot ucdavis.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83659] New: ICE on compilable C++ code: in tree_to_shwi, at tree.c:6821
Date: Tue, 02 Jan 2018 23:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83659
Bug ID: 83659
Summary: ICE on compilable C++ code: in tree_to_shwi, at
tree.c:6821
Product: gcc
Version: unknown
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Priority: P3
Component: c++
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Target Milestone: ---
This affects 7.x and the current trunk, and is a regression from 6.4.x.
$ g++tk -v
Using built-in specs.
COLLECT_GCC=g++tk
COLLECT_LTO_WRAPPER=/home/su/software/tmp/gcc/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/home/su/software/tmp/gcc/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 8.0.0 20180102 (experimental) [trunk revision 256110] (GCC)
$
$ g++-6.4.0 small.cpp
$ icc small.cpp
$ clang++ small.cpp
$
$ g++tk small.cpp
small.cpp: In function ‘int main()’:
small.cpp:7:42: internal compiler error: in tree_to_shwi, at tree.c:6821
reinterpret_cast < int * > (&a)[-1] += 1;
^
0x11559a2 tree_to_shwi(tree_node const*)
../../gcc-source-trunk/gcc/tree.c:6821
0x703bd7 cxx_fold_indirect_ref
../../gcc-source-trunk/gcc/cp/constexpr.c:3112
0x70bc4b cxx_eval_indirect_ref
../../gcc-source-trunk/gcc/cp/constexpr.c:3215
0x70bc4b cxx_eval_constant_expression
../../gcc-source-trunk/gcc/cp/constexpr.c:4271
0x7126ed cxx_eval_outermost_constant_expr
../../gcc-source-trunk/gcc/cp/constexpr.c:4769
0x715c06 maybe_constant_value(tree_node*, tree_node*)
../../gcc-source-trunk/gcc/cp/constexpr.c:4983
0x729de1 cp_fully_fold(tree_node*)
../../gcc-source-trunk/gcc/cp/cp-gimplify.c:2033
0x90b967 cp_build_binary_op(unsigned int, tree_code, tree_node*, tree_node*,
int)
../../gcc-source-trunk/gcc/cp/typeck.c:5381
0x919111 cp_build_modify_expr(unsigned int, tree_node*, tree_code, tree_node*,
int)
../../gcc-source-trunk/gcc/cp/typeck.c:8067
0x6d66ea build_new_op_1
../../gcc-source-trunk/gcc/cp/call.c:5963
0x6d6fce build_new_op(unsigned int, tree_code, int, tree_node*, tree_node*,
tree_node*, tree_node**, int)
../../gcc-source-trunk/gcc/cp/call.c:6047
0x91b133 build_x_modify_expr(unsigned int, tree_node*, tree_code, tree_node*,
int)
../../gcc-source-trunk/gcc/cp/typeck.c:8263
0x8042a6 cp_parser_assignment_expression
../../gcc-source-trunk/gcc/cp/parser.c:9458
0x80499a cp_parser_expression
../../gcc-source-trunk/gcc/cp/parser.c:9586
0x808179 cp_parser_expression_statement
../../gcc-source-trunk/gcc/cp/parser.c:11042
0x81185c cp_parser_statement
../../gcc-source-trunk/gcc/cp/parser.c:10858
0x812a1f cp_parser_statement_seq_opt
../../gcc-source-trunk/gcc/cp/parser.c:11185
0x812b2f cp_parser_compound_statement
../../gcc-source-trunk/gcc/cp/parser.c:11139
0x827f40 cp_parser_function_body
../../gcc-source-trunk/gcc/cp/parser.c:21681
0x827f40 cp_parser_ctor_initializer_opt_and_function_body
../../gcc-source-trunk/gcc/cp/parser.c:21716
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.
$
-------------------------------------------------------
typedef int V __attribute__ ((__vector_size__ (16)));
V a;
int main ()
{
reinterpret_cast < int * > (&a)[-1] += 1;
return 0;
}
>From gcc-bugs-return-587212-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 23:29:17 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/83656] missing -Wbuiltin-declaration-mismatch on declaration without prototype
Date: Tue, 02 Jan 2018 23:29:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=83655,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=82922
--- Comment #1 from Eric Gallager <egallager at gcc dot gnu.org> ---
I can't confirm due to bug 83655, but regardless, my preferred solution would
be to fix bug 82922 first.
>From gcc-bugs-return-587213-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 23:43:49 2018
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From: "wilson at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/83565] [7/8 regression] RTL combine pass breaks shift result (at least on ia64)
Date: Tue, 02 Jan 2018 23:43:00 -0000
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--- Comment #29 from Jim Wilson <wilson at gcc dot gnu.org> ---
(In reply to Sergei Trofimovich from comment #28)
> 1. Is it directly visible for you from RTL dumps which bits GCC assumes as
> non-zero or you just know RTL invariants? I had to patch gcc locally to
> verify RTL prediction by adding printfs into print_pattern to get the idea
> how it works:
I stepped through combine in gdb to find the problem.
> 2. Does gcc have any validation mode that could have caught this error after
> code generation and checking against RTL invariant?
We have some compile-time and run-time checking code, but nothing that would
catch a problem like this. We do have the regression testsuite which requires
manually adding testcases that get miscompiled, and hopefully prevents them
from getting miscompiled again.
>From gcc-bugs-return-587214-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 23:47:12 2018
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From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/81611] [8 Regression] gcc un-learned loop / post-increment optimization
Date: Tue, 02 Jan 2018 23:47:00 -0000
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--- Comment #12 from Jeffrey A. Law <law at redhat dot com> ---
You know, I wonder if we're missing something bigger here.
ISTM we're potentially missing CSEs in memory addresses as well as forward
propagation opportunities in MEM_REF expressions.
I strongly suspect DOM doesn't look inside a MEM_REF to see if the computed
address is lying around in hash table.
Similarly I wouldn't be surprised if forward propagation misses the opportunity
to eliminate instructions that compute addresses by propagating the constant
offset part into a MEM_REF.
>From gcc-bugs-return-587215-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 23:48:56 2018
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Subject: [Bug middle-end/61118] [6/7/8 Regression] Indirect call generated for pthread_cleanup_push with constant cleanup function
Date: Tue, 02 Jan 2018 23:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61118
--- Comment #20 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jeffrey A. Law from comment #19)
> Note you lost the regression marker when this was made a duplicate of 21161.
> So it's unlikely anyone would have looked at it until the next release cycle.
>
> My understanding from Florian is that at least some of the issues here are
> regressions, so I've added the marker to 21161.
Oops, sorry, thanks for fixing it
>From gcc-bugs-return-587216-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 23:52:02 2018
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Subject: [Bug middle-end/21161] [6/7/8 Regression] "clobbered by longjmp" warning ignores the data flow
Date: Tue, 02 Jan 2018 23:52:00 -0000
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Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.0
>From gcc-bugs-return-587217-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 02 23:53:41 2018
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Subject: [Bug middle-end/61118] [6/7/8 Regression] Indirect call generated for pthread_cleanup_push with constant cleanup function
Date: Tue, 02 Jan 2018 23:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61118
--- Comment #21 from Jeffrey A. Law <law at redhat dot com> ---
No problem Eric. I'm monitoring on behalf of Florian who'd really like to see
this fixed for gcc-8.
Actually just noticed it still wasn't showing up in the queries. It didn't
have a target milestone set either, which I've just fixed.
>From gcc-bugs-return-587218-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 00:10:09 2018
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Subject: [Bug rtl-optimization/83620] [8 Regression] ICE: in assign_by_spills, at lra-assigns.c:1470: unable to find a register to spill with -flive-range-shrinkage --param=max-sched-ready-insns=0
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Jeffrey A. Law <law at redhat dot com> changed:
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----------------------------------------------------------------------------
CC| |law at redhat dot com
--- Comment #5 from Jeffrey A. Law <law at redhat dot com> ---
I don't see a good rationale behind disallowing 0 for that param.
It'd be interesting to look at the scheduler dumps to see queues the decisions
it makes at the key point.
>From gcc-bugs-return-587219-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 02:11:48 2018
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Subject: [Bug libffi/83636] libffi/mips/n32: don't .set mips4 for mips r6
Date: Wed, 03 Jan 2018 02:11:00 -0000
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--- Comment #1 from YunQiang Su <syq at debian dot org> ---
and we found a new problem of libffi:
https://github.com/libffi/libffi/pull/401
/* lui $12,high(codeloc) */
tramp[2] = 0x3c0c0000 | ((unsigned)codeloc >> 16);
/* jr $25 */
+#if !defined(__mips_isa_rev) || (__mips_isa_rev<6)
tramp[3] = 0x03200008;
+#else
+ tramp[3] = 0x03200009;
+#endif
/* ori $12,low(codeloc) */
tramp[4] = 0x358c0000 | ((unsigned)codeloc & 0xffff);
#else
@@ -743,7 +747,11 @@ ffi_prep_closure_loc (ffi_closure *closure,
/* ori $25,low(fn) */
tramp[10] = 0x37390000 | ((unsigned long)fn & 0xffff);
/* jr $25 */
+#if !defined(__mips_isa_rev) || (__mips_isa_rev<6)
tramp[11] = 0x03200008;
+#else
+ tramp[11] = 0x03200009;
+#endif
/* ori $12,low(codeloc) */
tramp[12] = 0x358c0000 | ((unsigned long)codeloc & 0xffff);
>From gcc-bugs-return-587220-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 02:44:41 2018
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Subject: [Bug tree-optimization/81611] [8 Regression] gcc un-learned loop / post-increment optimization
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--- Comment #13 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
We do have such constant propagation on such ports as x86* and arm, but not on
avr. Presumably (I haven't checked) it has to do with available addressing
modes, and gimple's avoiding, even in MEM_REFs, address expressions that don't
fit its more stringent requirements.
>From gcc-bugs-return-587221-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 06:47:39 2018
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Subject: [Bug target/83660] New: ICE with vec_extract inside expression statement
Date: Wed, 03 Jan 2018 06:47:00 -0000
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Bug ID: 83660
Summary: ICE with vec_extract inside expression statement
Product: gcc
Version: 7.2.1
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CC: wschmidt at gcc dot gnu.org
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Target: powerpc64
Compile the following with g++ -mcpu=power7 -S ppc_vec_extract_ice.C
This probably happens with ppc64le as well. -mcpu=power7 is needed to make the
move go through memory, with power8 direct move instruction is used and there
is no coredump.
#include <altivec.h>
typedef __vector unsigned int uvec32_t __attribute__((__aligned__(16)));
unsigned get_word(uvec32_t v)
{
return ({const unsigned _B1 = 32;
vec_extract((uvec32_t)v, 2);});
}
>From gcc-bugs-return-587222-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 07:35:32 2018
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From: "prathamesh3492 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83661] New: sincos does not handle sin(2x)
Date: Wed, 03 Jan 2018 07:35:00 -0000
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Bug ID: 83661
Summary: sincos does not handle sin(2x)
Product: gcc
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Target Milestone: ---
Hi,
For the following test-case:
double f(double x)
{
return __builtin_sin(2*x) + __builtin_sin(x);
}
optimzied dump with -O2 -funsafe-math-optimizations -ffast-math shows:
;; Function f (f, funcdef_no=0, decl_uid=1952, cgraph_uid=0, symbol_order=0)
<bb 2> [local count: 1073741825]:
_1 = __builtin_sin (x_4(D));
_2 = x_4(D) * 2.0e+0;
_3 = __builtin_sin (_2);
_5 = _1 + _3;
return _5;
Would it be a good idea to enhance sincos pass to recognize the
identity sin(2*x) = 2*sin(x)*cos(x) and thus eliminate one call
to __builtin_sin ?
Writing 2*sin(x)*cos(x) explicitly in the source yields following optimized
dump:
<bb 2> [local count: 1073741825]:
sincostmp_8 = __builtin_cexpi (x_5(D));
_1 = IMAGPART_EXPR <sincostmp_8>;
_2 = REALPART_EXPR <sincostmp_8>;
_3 = _1 * _2;
_4 = _3 * 2.0e+0;
_6 = _2 + _4;
return _6;
I agree in general that adding math identities like sin(x)**2 + cos(x)**2 = 1
isn't a good idea since user would almost always write the "optimized" version
in practice. However for the above case, would the transform make sense ?
Thanks,
Prathamesh
>From gcc-bugs-return-587223-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 07:36:23 2018
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Subject: [Bug tree-optimization/83661] sincos does not handle sin(2x)
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prathamesh3492 at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |x86_64-unknown-linux-gnu
Host| |x86_64-unknown-linux-gnu
Build| |x86_64-unknown-linux-gnu
Severity|normal |enhancement
>From gcc-bugs-return-587224-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 07:57:50 2018
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From: "nico at josuttis dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83662] New: std::aligned_alloc() not available
Date: Wed, 03 Jan 2018 07:57:00 -0000
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Bug ID: 83662
Summary: std::aligned_alloc() not available
Product: gcc
Version: 8.0
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Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: nico at josuttis dot de
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C++17 is based on C11, which now standardizes aligned_alloc().
However, <cstdlib> does not provide it under namespace std:
#include <cstdlib>
int main()
{
auto p1 = std::malloc(100); // OK
auto p2 = aligned_alloc(64, 100); // OK
auto p3 = std::aligned_alloc(64, 100); // ERROR
}
Error:
prog.cc: In function 'int main()':
prog.cc:7:18: error: 'aligned_alloc' is not a member of 'std'
auto p3 = std::aligned_alloc(64, 100); // ERROR
^~~~~~~~~~~~~
prog.cc:7:18: note: suggested alternative: 'align_val_t'
auto p3 = std::aligned_alloc(64, 100); // ERROR
^~~~~~~~~~~~~
align_val_t
>From gcc-bugs-return-587225-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 08:00:33 2018
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From: "nico at josuttis dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83662] std::aligned_alloc() not available
Date: Wed, 03 Jan 2018 08:00:00 -0000
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--- Comment #1 from Nicolai Josuttis <nico at josuttis dot de> ---
Jonathan commented:
> Ah yes, we already have autoconf macros to detect the presence of
> ::aligned_alloc() so adding the using-directive to namespace std should
> be easy.
>From gcc-bugs-return-587226-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 08:07:27 2018
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Subject: [Bug libstdc++/83662] std::aligned_alloc() not available
Date: Wed, 03 Jan 2018 08:07:00 -0000
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Just to make sure what options are you using to compile the program?
>From gcc-bugs-return-587227-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 08:25:08 2018
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Subject: [Bug libstdc++/83662] std::aligned_alloc() not available
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--- Comment #3 from Nicolai Josuttis <nico at josuttis dot de> ---
See for example here:
https://wandbox.org/permlink/aOV13KmAUMKzSmxz
>From gcc-bugs-return-587228-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 08:32:19 2018
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From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/81611] [8 Regression] gcc un-learned loop / post-increment optimization
Date: Wed, 03 Jan 2018 08:32:00 -0000
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--- Comment #14 from Jeffrey A. Law <law at redhat dot com> ---
MEM_REF (as opposed to TARGET_MEM_REF) should be able to handle any simple
SSA_NAME + CONSTANT_OFFSET which are all we're really concerned with here. THe
target's addressing modes don't really enter the picture (that's what
TARGET_MEM_REF is for).
I'd look for an issue in the types preventing forwprop from doing its job here.
>From gcc-bugs-return-587229-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 08:47:07 2018
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Subject: [Bug c++/83659] [7/8 Regression] ICE on compilable C++ code: in tree_to_shwi, at tree.c:6821
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-03
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |7.4
Summary|ICE on compilable C++ code: |[7/8 Regression] ICE on
|in tree_to_shwi, at |compilable C++ code: in
|tree.c:6821 |tree_to_shwi, at
| |tree.c:6821
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r238559.
>From gcc-bugs-return-587230-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 08:53:42 2018
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Subject: [Bug c++/83659] [7/8 Regression] ICE on compilable C++ code: in tree_to_shwi, at tree.c:6821
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Looks like using unsigned HOST_WIDE_INT offset in /* ((foo*)&vectorfoo)[1] =>
BIT_FIELD_REF<vectorfoo,...> */ in cxx_fold_indirect_ref would help.
>From gcc-bugs-return-587231-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 08:53:53 2018
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Subject: [Bug c++/83659] [7/8 Regression] ICE on compilable C++ code: in tree_to_shwi, at tree.c:6821
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>From gcc-bugs-return-587232-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 09:01:33 2018
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Subject: [Bug target/83387] PowerPC64: Infinite loops in do_reload() with -msoft-float
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--- Comment #15 from Sebastian Huber <sebastian.huber@embedded-brains.de> ---
(In reply to Sebastian Huber from comment #14)
> (In reply to Peter Bergner from comment #13)
> > (In reply to Sebastian Huber from comment #12)
> > > (In reply to Peter Bergner from comment #9)
> > > [...]
> > > > Here, you can see that on ELFv2, we always assume HW FP regs are avialable,
> > > > because we're forcing usage of HW FP registers (FP_ARG_RETURN, ie, f1, aka
> > > > reg 33). I'm afraid that are going to be a *LOT* of these assumptions
> > > > builtin into the backend and tracking them all down and fixing them is not
> > > > going to be easy. That's why I asked earlier, if you really really need to
> > > > disable HW FP for your builds. If you do, then good luck to you finding
> > > > them all.
> > >
> > > Thanks for your investigations. I removed the 64-bit soft-float multilib.
> >
> > I can't promise this is all you need, but does the following patch help?
> >
> > Index: gcc/config/rs6000/rs6000.c
> > ===================================================================
> > --- gcc/config/rs6000/rs6000.c (revision 255700)
> > +++ gcc/config/rs6000/rs6000.c (working copy)
> > @@ -11095,7 +11095,8 @@ rs6000_discover_homogeneous_aggregate (m
> > homogeneous aggregates; these types are handled via the
> > targetm.calls.split_complex_arg mechanism. Complex types
> > can be elements of homogeneous aggregates, however. */
> > - if (DEFAULT_ABI == ABI_ELFv2 && type && AGGREGATE_TYPE_P (type))
> > + if (TARGET_HARD_FLOAT && DEFAULT_ABI == ABI_ELFv2 && type
> > + && AGGREGATE_TYPE_P (type))
> > {
> > machine_mode field_mode = VOIDmode;
> > int field_count = rs6000_aggregate_candidate (type, &field_mode);
> >
> >
> >
>
> With this patch I can build an Ada compiler with a -m64 and -msoft-float
> multilib.
How do we want to continue with this PR? Close it as WONTFIX or apply the patch
and close it as FIXED?
>From gcc-bugs-return-587233-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 09:17:22 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/47618] Collecting multiple profiles and using all for PGO
Date: Wed, 03 Jan 2018 09:17:00 -0000
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--- Comment #20 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Petr Å paÄek from comment #19)
> Sure, I would be happy with any version, thank you!
>
> For people who want to generate code coverage reports for parallel
> executions, beware of https://github.com/linux-test-project/lcov/issues/37.
Good. I will do it in timeframe of stage1 of GCC 9.
>From gcc-bugs-return-587234-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 09:25:20 2018
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Subject: [Bug ipa/83594] [8 Regression] ICE: in function_and_variable_visibility, at ipa-visibility.c:640 with __attribute__((noipa))
Date: Wed, 03 Jan 2018 09:25:00 -0000
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Jan 3 09:24:40 2018
New Revision: 256167
URL: https://gcc.gnu.org/viewcvs?rev=256167&root=gcc&view=rev
Log:
Handle noipa attribute in IPA visibility (PR ipa/83594).
2018-01-03 Martin Liska <mliska@suse.cz>
PR ipa/83594
* ipa-visibility.c (function_and_variable_visibility): Skip
functions with noipa attribure.
2018-01-03 Martin Liska <mliska@suse.cz>
PR ipa/83594
* gcc.dg/ipa/pr83594.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/ipa/pr83594.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ipa-visibility.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/83663] New: [8 regression] aarch64_be regressions after r255946
Date: Wed, 03 Jan 2018 09:54:00 -0000
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Bug ID: 83663
Summary: [8 regression] aarch64_be regressions after r255946
Product: gcc
Version: 8.0
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I have noticed regressions on aarch64_be after r255946:
PASS now FAIL [PASS => FAIL]:
Executed from: gcc.c-torture/execute/execute.exp
gcc.c-torture/execute/20030928-1.c -O3 -fomit-frame-pointer
-funroll-loops -fpeel-loops -ftracer -finline-functions execution test
gcc.c-torture/execute/20030928-1.c -O3 -g execution test
gcc.c-torture/execute/20050224-1.c -O3 -fomit-frame-pointer
-funroll-loops -fpeel-loops -ftracer -finline-functions execution test
gcc.c-torture/execute/20050224-1.c -O3 -g execution test
gcc.c-torture/execute/pr23135.c -O0 execution test
gcc.c-torture/execute/pr27073.c -O3 -fomit-frame-pointer -funroll-loops
-fpeel-loops -ftracer -finline-functions execution test
gcc.c-torture/execute/pr27073.c -O3 -g execution test
gcc.c-torture/execute/pr28982a.c -O3 -fomit-frame-pointer -funroll-loops
-fpeel-loops -ftracer -finline-functions execution test
gcc.c-torture/execute/pr28982a.c -O3 -g execution test
gcc.c-torture/execute/pr53645-2.c -O0 execution test
gcc.c-torture/execute/pr53645.c -O0 execution test
gcc.c-torture/execute/pr53645.c -O1 execution test
gcc.c-torture/execute/pr53645.c -O2 execution test
gcc.c-torture/execute/pr53645.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none execution test
gcc.c-torture/execute/pr53645.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects execution test
gcc.c-torture/execute/pr53645.c -O3 -fomit-frame-pointer -funroll-loops
-fpeel-loops -ftracer -finline-functions execution test
gcc.c-torture/execute/pr53645.c -O3 -g execution test
gcc.c-torture/execute/pr53645.c -Os execution test
gcc.c-torture/execute/scal-to-vec1.c -O0 execution test
gcc.c-torture/execute/scal-to-vec2.c -O0 execution test
gcc.c-torture/execute/simd-1.c -O0 execution test
gcc.c-torture/execute/simd-2.c -O0 execution test
Executed from: gcc.dg/dg.exp
gcc.dg/pr48616.c execution test
gcc.dg/sms-7.c execution test
Executed from: gcc.dg/torture/dg-torture.exp
gcc.dg/torture/pr52407.c -O0 execution test
gcc.dg/torture/pr52407.c -O1 execution test
gcc.dg/torture/pr52407.c -O2 execution test
gcc.dg/torture/pr52407.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none execution test
gcc.dg/torture/pr52407.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects execution test
gcc.dg/torture/pr52407.c -O3 -fomit-frame-pointer -funroll-loops
-fpeel-loops -ftracer -finline-functions execution test
gcc.dg/torture/pr52407.c -O3 -g execution test
gcc.dg/torture/pr52407.c -Os execution test
Executed from: gcc.dg/vect/vect.exp
gcc.dg/vect/O3-pr70130.c execution test
gcc.dg/vect/bb-slp-11.c execution test
gcc.dg/vect/bb-slp-22.c execution test
gcc.dg/vect/no-scevccp-outer-10.c execution test
gcc.dg/vect/pr53185-2.c -flto -ffat-lto-objects execution test
gcc.dg/vect/pr53185-2.c execution test
gcc.dg/vect/pr57705.c execution test
gcc.dg/vect/pr64404.c -flto -ffat-lto-objects execution test
gcc.dg/vect/pr64404.c execution test
gcc.dg/vect/pr66251.c -flto -ffat-lto-objects execution test
gcc.dg/vect/pr66251.c execution test
gcc.dg/vect/pr66253.c -flto -ffat-lto-objects execution test
gcc.dg/vect/pr66253.c execution test
gcc.dg/vect/pr71259.c -flto -ffat-lto-objects execution test
gcc.dg/vect/pr71259.c execution test
gcc.dg/vect/pr79920.c -flto -ffat-lto-objects execution test
gcc.dg/vect/pr79920.c execution test
gcc.dg/vect/slp-2.c execution test
gcc.dg/vect/slp-20.c execution test
gcc.dg/vect/slp-22.c execution test
gcc.dg/vect/slp-41.c execution test
gcc.dg/vect/slp-43.c execution test
gcc.dg/vect/slp-45.c execution test
gcc.dg/vect/slp-multitypes-11.c execution test
gcc.dg/vect/slp-multitypes-2.c execution test
gcc.dg/vect/slp-perm-11.c execution test
Executed from: gcc.target/aarch64/advsimd-intrinsics/advsimd-intrinsics.exp
gcc.target/aarch64/advsimd-intrinsics/vaba.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vabd.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vadd.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vaddhn.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vand.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vbic.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vbsl.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vcge.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vcgt.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vcle.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vcls.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vclt.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vclz.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vcnt.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vdup-vmov.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vdup_lane.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/veor.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vext.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vhadd.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vhsub.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vld1_dup.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vmax.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vmin.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vmla.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vmla_lane.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vmla_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vmls.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vmls_lane.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vmls_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vmul.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vorn.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vorr.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqabs.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqadd.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqdmulh.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqdmulh_lane.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqdmulh_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqmovn.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqmovun.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqneg.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqrdmulh.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqrdmulh_lane.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqrdmulh_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqrshl.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqrshrn_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqrshrun_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqshl.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqshl_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqshlu_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqshrn_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqshrun_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqsub.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vqtbX.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vraddhn.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vrhadd.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vrshl.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vrshr_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vrsra_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vrsubhn.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vshl.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vsli_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vsra_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vsri_n.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vsub.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vsubhn.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vtrn.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vtrn_half.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vtst.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vuzp.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vuzp_half.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vzip.c -O0 execution test
gcc.target/aarch64/advsimd-intrinsics/vzip_half.c -O0 execution test
Executed from: gcc.target/aarch64/simd/simd.exp
gcc.target/aarch64/simd/vmulx_laneq_f32_1.c execution test
gcc.target/aarch64/simd/vmulxq_laneq_f32_1.c execution test
gcc.target/aarch64/simd/vmulxs_laneq_f32_1.c execution test
Executed from: gcc.target/aarch64/aarch64.exp
gcc.target/aarch64/vect-vaddv.c execution test
gcc.target/aarch64/vect-vmaxv.c execution test
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Subject: [Bug bootstrap/81926] [7 regression] go/parse.o differs between stage2 and stage3
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--- Comment #37 from Rainer Orth <ro at gcc dot gnu.org> ---
Created attachment 43011
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43011&action=edit
alternative patch for comparison failure with /bin/as
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Subject: [Bug c++/83639] Vector element address problem after push_back
Date: Wed, 03 Jan 2018 09:58:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
See http://en.cppreference.com/w/cpp/container/vector#Iterator_invalidation
and http://en.cppreference.com/w/cpp/container/vector/push_back
You also need to read https://stackoverflow.com/questions/228783 re __PATH0__
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Subject: [Bug target/83663] [8 regression] aarch64_be regressions after r255946
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James Greenhalgh <jgreenhalgh at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-01-03
CC| |jgreenhalgh at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |jgreenhalgh at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
I spotted this too, the problem is (as it always is for big-endian vectors in
GCC) the mismatch in lane numbering between our architecture and GCC's
numbering. I'm working on a patch. Sorry for the inconvenience.
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From: "ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/81926] [7 regression] go/parse.o differs between stage2 and stage3
Date: Wed, 03 Jan 2018 09:59:00 -0000
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--- Comment #38 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
> Note that dwarf2out.c causes the section to be emitted via
>
> static void
> dwarf2out_assembly_start (void)
> {
> #ifndef DWARF2_LINENO_DEBUGGING_INFO
> ASM_GENERATE_INTERNAL_LABEL (text_section_label, TEXT_SECTION_LABEL, 0);
> ASM_GENERATE_INTERNAL_LABEL (text_end_label, TEXT_END_LABEL, 0);
> ASM_GENERATE_INTERNAL_LABEL (cold_text_section_label,
> COLD_TEXT_SECTION_LABEL, 0);
> ASM_GENERATE_INTERNAL_LABEL (cold_end_label, COLD_END_LABEL, 0);
>
> switch_to_section (text_section);
> ASM_OUTPUT_LABEL (asm_out_file, text_section_label);
> #endif
> ...
>
> part of the code refering to the label is guarded by a text_section_used
> flag btw., not sure if that works reliably enough but I guess it is
> only properly initialized after the above. Thus the middle-end would
> need to support sth like 'give me a label at the start of section FOO'.
>
> The easiest workaround is indeed to always emit .text (which indeed gas does).
> And I'd rather do that where the assemby_start debug hook is called instead
> of in target specific hooks.
The newly attached patch does that and worked for me on
sparc-sun-solaris2.11.
I've left the assembly_start call in vmsdbgout.c
(vmsdbgout_assembly_start) alone since I can neither test it nor does it
seem affected: it's only called for VMS_AND_DWARF2_DEBUG which isn't
problematic.
Rainer
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Subject: [Bug ipa/83594] [8 Regression] ICE: in function_and_variable_visibility, at ipa-visibility.c:640 with __attribute__((noipa))
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug target/83387] PowerPC64: Infinite loops in do_reload() with -msoft-float
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--- Comment #16 from Segher Boessenkool <segher at gcc dot gnu.org> ---
> > > --- gcc/config/rs6000/rs6000.c (revision 255700)
> > > +++ gcc/config/rs6000/rs6000.c (working copy)
> > > @@ -11095,7 +11095,8 @@ rs6000_discover_homogeneous_aggregate (m
> > > homogeneous aggregates; these types are handled via the
> > > targetm.calls.split_complex_arg mechanism. Complex types
> > > can be elements of homogeneous aggregates, however. */
> > > - if (DEFAULT_ABI == ABI_ELFv2 && type && AGGREGATE_TYPE_P (type))
> > > + if (TARGET_HARD_FLOAT && DEFAULT_ABI == ABI_ELFv2 && type
> > > + && AGGREGATE_TYPE_P (type))
> > > {
> > > machine_mode field_mode = VOIDmode;
> > > int field_count = rs6000_aggregate_candidate (type, &field_mode);
> > >
> > >
> > >
> >
> > With this patch I can build an Ada compiler with a -m64 and -msoft-float
> > multilib.
>
> How do we want to continue with this PR? Close it as WONTFIX or apply the
> patch and close it as FIXED?
If it works, and doesn't regress anything, it is pre-approved. So please
test it on powerp64le-linux (gcc112 for example).
>From gcc-bugs-return-587242-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 10:10:53 2018
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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/83664] New: Eoshift accepts missing boundary for non-default types
Date: Wed, 03 Jan 2018 10:10:00 -0000
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Bug ID: 83664
Summary: Eoshift accepts missing boundary for non-default types
Product: gcc
Version: unknown
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Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
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The following code is invalid:
program main
type t
integer :: x
end type t
type(t), dimension(2) :: a, b
a(1)%x = 1
a(2)%x = 2
b = eoshift(a,1)
print *,b%x
end program main
To quote from the F2003 standard:
BOUNDARY
shall be of the same type and type parameters as ARRAY and shall be scalar
(optional)
if ARRAY has rank one; otherwise, it shall be either scalar or of rank n − 1
and of shape (d1, d2 , ..., dDIM−1 , dDIM+1 , ..., dn). BOUNDARY may be
omitted for the types in the following table and, in this case, it is as if it
were
present with the scalar value shown.
(the table then shows Integer, Real, Complex, Logical and Character).
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Subject: [Bug other/82352] [7/8 Regression] comdat-local function called by void h::i() outside its comdat
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 43012
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43012&action=edit
Untested patch
Can you please the patch for original test-case? Not the reduced one?
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Subject: [Bug lto/81968] [8 regression] early lto debug objects make Solaris ld SEGV
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Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #42563|0 |1
is obsolete| |
Attachment #42998|0 |1
is obsolete| |
--- Comment #44 from Rainer Orth <ro at gcc dot gnu.org> ---
Created attachment 43013
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43013&action=edit
Updated patch after PR lto/83452 integration
>From gcc-bugs-return-587245-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 10:23:19 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 lto/81968] [8 regression] early lto debug objects make Solaris ld SEGV
Date: Wed, 03 Jan 2018 10:23:00 -0000
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--- Comment #45 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #43 from rguenther at suse dot de <rguenther at suse dot de> ---
> On Tue, 2 Jan 2018, ro at CeBiTec dot Uni-Bielefeld.DE wrote:
>
>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81968
>>
>> --- Comment #42 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec
>> dot Uni-Bielefeld.DE> ---
>> > --- Comment #41 from rguenther at suse dot de <rguenther at suse dot de> ---
>> [...]
>> >> Unfortunately not: it's really the section index pointing to the
>> >> non-existing (i.e. eliminated) .gnu.debuglto_.debug_info section.
>> >
>> > But that section shouldn't be eliminated :/
>>
>> IIUC it has been renamed to .debug_info:
>>
>> * input object (cp_lto_pr42987_0.o):
>>
>> Section Header[9]: sh_name: .gnu.debuglto_.debug_info
>> sh_addr: 0 sh_flags: 0
>> sh_size: 0x3d4 sh_type: [ SHT_PROGBITS ]
>> sh_offset: 0x7fb sh_entsize: 0
>> sh_link: 0 sh_info: 0
>> sh_addralign: 0x1
>>
>> * output object (ccw3tETddebugobjtem):
>>
>> Section Header[2]: sh_name: .debug_info
>> sh_addr: 0 sh_flags: 0
>> sh_size: 0x3d4 sh_type: [ SHT_PROGBITS ]
>> sh_offset: 0x84d sh_entsize: 0
>> sh_link: 0 sh_info: 0
>> sh_addralign: 0x1
>>
>> without adapting section indices in .symtab.
>
> Yes. It should have retained [9] as section index. Hmmm - you
> have the patch removing sections in your tree? I guess you need
Indeed: without it, Solaris results are far worse.
> to adapt (aka remap) the first_shndx section index I added with
> the patch for the hpux ld issue.
Right: with that change, the .symtab warnings are gone.
>> Besides, there's also a dangling
>>
>> Section Header[6]: sh_name: .rel.gnu.debuglto_.debug_info
>> sh_addr: 0 sh_flags: 0
>> sh_size: 0x8 sh_type: [ SHT_REL ]
>> sh_offset: 0x11c8 sh_entsize: 0x8 (1 entry)
>> sh_link: 5 sh_info: 9
>> sh_addralign: 0x4
>>
>> in the output object.
>
> that should have been used as the reloc section for the new section 2.
> I see sh_info is still 9, it should be 2. That's eventually
> missing handling in the section removal patch.
I'll try to figure this out.
> I've committed the hpux fix so in case you re-base the patch and
> fix up the first_shndx issue please attach the rebased one.
Just did so.
Rainer
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Subject: [Bug middle-end/83665] New: [8 regression] Big code size regression and some code quality improvement at Jan 2 2018
Date: Wed, 03 Jan 2018 10:39:00 -0000
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Bug ID: 83665
Summary: [8 regression] Big code size regression and some code
quality improvement at Jan 2 2018
Product: gcc
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The change is visible at
https://gcc.opensuse.org/gcc-old/SPEC/CINT/sb-czerny-head-64/recent.html
https://gcc.opensuse.org/gcc-old/SPEC/CINT/sb-czerny-head-64/size.html
The affected run is Jan 2 2018
https://gcc.opensuse.org/gcc-old/SPEC/CINT/sb-czerny-head-64/list.html
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Subject: [Bug middle-end/83665] [8 regression] Big code size regression and some code quality improvement at Jan 2 2018
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Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |trippels at gcc dot gnu.org
--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Also visible here:
https://vmakarov.fedorapeople.org/spec/spec2000.topka/gcc/home.html
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Subject: [Bug ipa/83619] [8 Regression] ICE in inliner: caller edge count does not match BB count
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Jan Hubicka <hubicka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-03
Ever confirmed|0 |1
--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Returning 1 from cgraph_edge::sreal_frequency is equivalent of what we always
did - when there is no profile we assume every call have same weight (and also
disable recursive inlining).
Counts should be initialized after the estimation. If not, we should get ICE in
the verifier we see here. However profile estimation is local only, so if you
convert it to ipa (), then you get unintialized as we do not know the global
count of calls within the whole program (don't to whole program propagation).
I will take a look what is going on here.
Honza
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Subject: [Bug fortran/83664] Eoshift accepts missing boundary for non-default types
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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--- Comment #1 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Wed Jan 3 11:31:20 2018
New Revision: 256171
URL: https://gcc.gnu.org/viewcvs?rev=256171&root=gcc&view=rev
Log:
2018-01-03 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/83664
* check.c (gfc_check_eoshift): Error for missing boundary if array
is not one of the standard types.
2018-01-03 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/83664
* gfortran.dg/eoshift_7.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/eoshift_7.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/check.c
trunk/gcc/testsuite/ChangeLog
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Fixed on trunk, closing.
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--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
One potential candidate is the ipa-inline big_speedup_p fix by Richard. It
does not seem to explain all the difference though. I have quickly checked that
it does affect gzip LTO binary, but less than reported - by about 2.5KB.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/83649] Large reads fail
Date: Wed, 03 Jan 2018 11:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83649
--- Comment #6 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Author: jb
Date: Wed Jan 3 11:46:38 2018
New Revision: 256172
URL: https://gcc.gnu.org/viewcvs?rev=256172&root=gcc&view=rev
Log:
PR libgfortran/83649 Chunk large reads and writes
Backport from trunk.
It turns out that Linux never reads or writes more than 2147479552
bytes in a single syscall. For writes this is not a problem as
libgfortran already contains a loop around write() to handle short
writes. But for reads we cannot do this, since then read will hang if
we have a short read when reading from the terminal. Also, there are
reports that macOS fails I/O's larger than 2 GB. Thus, to work around
these issues do large reads/writes in chunks.
The testcase from the PR
program largewr
integer(kind=1) :: a(2_8**31+1)
a = 0
a(size(a, kind=8)) = 1
open(10, file="largewr.dat", access="stream", form="unformatted")
write (10) a
close(10)
a(size(a, kind=8)) = 2
open(10, file="largewr.dat", access="stream", form="unformatted")
read (10) a
if (a(size(a, kind=8)) == 1) then
print *, "All is well"
else
print *, "Oh no"
end if
end program largewr
fails on trunk but works with the patch.
Regtested on x86_64-pc-linux-gnu, committed to trunk.
libgfortran/ChangeLog:
2018-01-03 Janne Blomqvist <jb@gcc.gnu.org>
PR libgfortran/83649
* io/unix.c (MAX_CHUNK): New define.
(raw_read): For reads larger than MAX_CHUNK, loop.
(raw_write): Write no more than MAX_CHUNK bytes per iteration.
---
libgfortran/io/unix.c | 50 ++++++++++++++++++++++++++++++++++++++++++--------
1 file changed, 42 insertions(+), 8 deletions(-)
diff --git a/libgfortran/io/unix.c b/libgfortran/io/unix.c
index a07a3c9..7a982b3 100644
--- a/libgfortran/io/unix.c
+++ b/libgfortran/io/unix.c
@@ -292,18 +292,49 @@ raw_flush (unix_stream *s __attribute__ ((unused)))
return 0;
}
+/* Write/read at most 2 GB - 4k chunks at a time. Linux never reads or
+ writes more than this, and there are reports that macOS fails for
+ larger than 2 GB as well. */
+#define MAX_CHUNK 2147479552
+
static ssize_t
raw_read (unix_stream *s, void *buf, ssize_t nbyte)
{
/* For read we can't do I/O in a loop like raw_write does, because
that will break applications that wait for interactive I/O. We
- still can loop around EINTR, though. */
- while (true)
+ still can loop around EINTR, though. This however causes a
+ problem for large reads which must be chunked, see comment above.
+ So assume that if the size is larger than the chunk size, we're
+ reading from a file and not the terminal. */
+ if (nbyte <= MAX_CHUNK)
{
- ssize_t trans = read (s->fd, buf, nbyte);
- if (trans == -1 && errno == EINTR)
- continue;
- return trans;
+ while (true)
+ {
+ ssize_t trans = read (s->fd, buf, nbyte);
+ if (trans == -1 && errno == EINTR)
+ continue;
+ return trans;
+ }
+ }
+ else
+ {
+ ssize_t bytes_left = nbyte;
+ char *buf_st = buf;
+ while (bytes_left > 0)
+ {
+ ssize_t to_read = bytes_left < MAX_CHUNK ? bytes_left: MAX_CHUNK;
+ ssize_t trans = read (s->fd, buf_st, to_read);
+ if (trans == -1)
+ {
+ if (errno == EINTR)
+ continue;
+ else
+ return trans;
+ }
+ buf_st += trans;
+ bytes_left -= trans;
+ }
+ return nbyte - bytes_left;
}
}
@@ -317,10 +348,13 @@ raw_write (unix_stream *s, const void *buf, ssize_t
nbyte)
buf_st = (char *) buf;
/* We must write in a loop since some systems don't restart system
- calls in case of a signal. */
+ calls in case of a signal. Also some systems might fail outright
+ if we try to write more than 2 GB in a single syscall, so chunk
+ up large writes. */
while (bytes_left > 0)
{
- trans = write (s->fd, buf_st, bytes_left);
+ ssize_t to_write = bytes_left < MAX_CHUNK ? bytes_left: MAX_CHUNK;
+ trans = write (s->fd, buf_st, to_write);
if (trans == -1)
{
if (errno == EINTR)
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Subject: [Bug rtl-optimization/83666] New: [8 Regression] ICE: SIGFPE with -O2 -g --param=sccvn-max-scc-size\x10
Date: Wed, 03 Jan 2018 12:03:00 -0000
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Bug ID: 83666
Summary: [8 Regression] ICE: SIGFPE with -O2 -g
--param=sccvn-max-scc-size=10
Product: gcc
Version: 8.0
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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 43014
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43014&action=edit
reduced testcase
Might be related to PR83621
Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 -g --param=sccvn-max-scc-size=10 testcase.c
testcase.c: In function 'bar':
testcase.c:9:1: warning: AVX512F vector return without AVX512F enabled changes
the ABI [-Wpsabi]
{
^
during RTL pass: expand
testcase.c: In function 'foo':
testcase.c:21:1: internal compiler error: Floating point exception
foo (void)
^~~
0xd4f2df crash_signal
/repo/gcc-trunk/gcc/toplev.c:325
0x84e0c5 if_nonpoly<unsigned short, bool, poly_int_traits<unsigned
short>::is_poly>::type multiple_p<1u, long, unsigned short>(poly_int_pod<1u,
long> const&, unsigned short)
/repo/gcc-trunk/gcc/poly-int.h:2040
0x84e0c5 expand_debug_expr
/repo/gcc-trunk/gcc/cfgexpand.c:4580
0x858287 expand_debug_locations
/repo/gcc-trunk/gcc/cfgexpand.c:5362
0x858287 execute
/repo/gcc-trunk/gcc/cfgexpand.c:6406
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-256069-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.0/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-256069-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
gcc version 8.0.0 20180102 (experimental) (GCC)
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Subject: [Bug target/83632] pdt_26.f03:29:0: internal compiler error: in final_scan_insn, at final.c:3063
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Christophe Lyon <clyon at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |clyon at gcc dot gnu.org,
| |pault at gcc dot gnu.org
--- Comment #1 from Christophe Lyon <clyon at gcc dot gnu.org> ---
This was introduced with r256019
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Subject: [Bug libfortran/83649] Large reads fail
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83649
--- Comment #7 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Author: jb
Date: Wed Jan 3 12:08:05 2018
New Revision: 256173
URL: https://gcc.gnu.org/viewcvs?rev=256173&root=gcc&view=rev
Log:
PR libgfortran/83649 Chunk large reads and writes
Backport from trunk.
It turns out that Linux never reads or writes more than 2147479552
bytes in a single syscall. For writes this is not a problem as
libgfortran already contains a loop around write() to handle short
writes. But for reads we cannot do this, since then read will hang if
we have a short read when reading from the terminal. Also, there are
reports that macOS fails I/O's larger than 2 GB. Thus, to work around
these issues do large reads/writes in chunks.
The testcase from the PR
program largewr
integer(kind=1) :: a(2_8**31+1)
a = 0
a(size(a, kind=8)) = 1
open(10, file="largewr.dat", access="stream", form="unformatted")
write (10) a
close(10)
a(size(a, kind=8)) = 2
open(10, file="largewr.dat", access="stream", form="unformatted")
read (10) a
if (a(size(a, kind=8)) == 1) then
print *, "All is well"
else
print *, "Oh no"
end if
end program largewr
fails on trunk but works with the patch.
Regtested on x86_64-pc-linux-gnu, committed to trunk.
libgfortran/ChangeLog:
2018-01-03 Janne Blomqvist <jb@gcc.gnu.org>
PR libgfortran/83649
* io/unix.c (MAX_CHUNK): New define.
(raw_read): For reads larger than MAX_CHUNK, loop.
(raw_write): Write no more than MAX_CHUNK bytes per iteration.
Modified:
branches/gcc-6-branch/libgfortran/ChangeLog
branches/gcc-6-branch/libgfortran/io/unix.c
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Subject: [Bug libfortran/83649] Large reads fail
Date: Wed, 03 Jan 2018 12:10:00 -0000
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Janne Blomqvist <jb at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #8 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Fixed on trunk/7/6, closing.
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Subject: [Bug c++/83634] [8 Regression] ICE in useless_type_conversion_p, at gimple-expr.c:86
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Jan 3 12:16:13 2018
New Revision: 256174
URL: https://gcc.gnu.org/viewcvs?rev=256174&root=gcc&view=rev
Log:
PR c++/83634
* cp-gimplify.c (cp_fold) <case NOP_EXPR>: If the operand folds to
error_mark_node, return error_mark_node.
* g++.dg/parse/pr83634.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/parse/pr83634.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/cp-gimplify.c
trunk/gcc/testsuite/ChangeLog
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug preprocessor/83602] [8 Regression] ICE in cpp_macro_definition_location(cpp_hashnode*) on invalid code
Date: Wed, 03 Jan 2018 12:17:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Jan 3 12:17:05 2018
New Revision: 256175
URL: https://gcc.gnu.org/viewcvs?rev=256175&root=gcc&view=rev
Log:
PR preprocessor/83602
* name-lookup.c (lookup_name_fuzzy): Don't use macro_use_before_def
for builtin macros.
* g++.dg/cpp/pr83602.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp/pr83602.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/name-lookup.c
trunk/gcc/testsuite/ChangeLog
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/83667] New: ICE in dump_function_decl on a thunk with variadic arguments
Date: Wed, 03 Jan 2018 12:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83667
Bug ID: 83667
Summary: ICE in dump_function_decl on a thunk with variadic
arguments
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
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Very ancient bug, fails for all releases I have:
$ cat ice.cpp
struct a
{
virtual ~a ();
};
struct b
{
virtual void d (...);
};
struct : a, b
{
void
d (...)
{
}
} c;
$ ./xgcc -B. ice.cpp -fdump-ipa-inline
during IPA pass: inline
/home/marxin/Programming/testcases/ice.cpp:15:4: internal compiler error:
Segmentation fault
} c;
^
0x120ee31 crash_signal
../../gcc/toplev.c:325
0x81e0d4 tree_check(tree_node*, char const*, int, char const*, tree_code)
../../gcc/tree.h:3127
0x93d23a dump_function_decl
../../gcc/cp/error.c:1604
0x93b36b dump_decl
../../gcc/cp/error.c:1259
0x943e21 decl_as_string(tree_node*, int)
../../gcc/cp/error.c:2956
0x943ef9 lang_decl_name(tree_node*, int, bool)
../../gcc/cp/error.c:2990
0xae90a8 cxx_printable_name_internal
../../gcc/cp/tree.c:2556
0xae9148 cxx_printable_name(tree_node*, int)
../../gcc/cp/tree.c:2565
0xc60c85 symtab_node::name() const
../../gcc/symtab.c:524
0xf4a057 ipa_dump_fn_summary(_IO_FILE*, cgraph_node*)
../../gcc/ipa-fnsummary.c:889
0xf4a4eb ipa_dump_fn_summaries(_IO_FILE*)
../../gcc/ipa-fnsummary.c:959
0x1db5621 ipa_inline
../../gcc/ipa-inline.c:2370
0x1db667e execute
../../gcc/ipa-inline.c:2855
│1600 if (DECL_CLASS_SCOPE_P (t))
│1601 cname = DECL_CONTEXT (t);
│1602 /* This is for partially instantiated template methods. */
│1603 else if (TREE_CODE (fntype) == METHOD_TYPE)
>│1604 cname = TREE_TYPE (TREE_VALUE (parmtypes));
parmtypes == 0
Nathan can you please take a look?
Martin
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Subject: [Bug ipa/83549] [7/8 Regression] error: generic thunk code fails for method ... which uses '...'
Date: Wed, 03 Jan 2018 12:23:00 -0000
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Btw. how did you Jakub get the error?
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From: "nathan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83667] ICE in dump_function_decl on a thunk with variadic arguments
Date: Wed, 03 Jan 2018 12:24:00 -0000
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-01-03
Assignee|unassigned at gcc dot gnu.org |nathan at gcc dot gnu.org
Ever confirmed|0 |1
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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/83668] New: [8 Regression] wrong code with -O -fno-tree-dominator-opts -fgraphite-identity
Date: Wed, 03 Jan 2018 12:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83668
Bug ID: 83668
Summary: [8 Regression] wrong code with -O
-fno-tree-dominator-opts -fgraphite-identity
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 43015
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43015&action=edit
reduced testcase
I have encountered several miscompilations with graphite, the minimum set of
flags seems to be the one reported in this PR. -fno-tree-dominator-opts seems
to be always present in the flags.
Output:
$ x86_64-pc-linux-gnu-gcc -O -fno-tree-dominator-opts -fgraphite-identity
testcase.c
$ ./a.out
Aborted
Here, a == 0.
$ 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-256069-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.0/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-256069-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
gcc version 8.0.0 20180102 (experimental) (GCC)
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/83549] [7/8 Regression] error: generic thunk code fails for method ... which uses '...'
Date: Wed, 03 Jan 2018 12:36:00 -0000
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
With current trunk:
$ ./cc1plus -quiet pr83549.C
$ ./cc1plus -quiet pr83549.C -O1
pr83549.C:4:4: error: generic thunk code fails for method ‘virtual void
C::_ZThn8_N1C3fooEz(...)’ which uses ‘...’
C c;
^
(likewise for -O2, -O3) on x86_64-linux.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/83549] [7/8 Regression] error: generic thunk code fails for method ... which uses '...'
Date: Wed, 03 Jan 2018 12:38:00 -0000
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #3)
> With current trunk:
>
> $ ./cc1plus -quiet pr83549.C
> $ ./cc1plus -quiet pr83549.C -O1
> pr83549.C:4:4: error: generic thunk code fails for method ‘virtual void
> C::_ZThn8_N1C3fooEz(...)’ which uses ‘...’
> C c;
> ^
>
> (likewise for -O2, -O3) on x86_64-linux.
I see. I've got patch for that. My question is how did you isolate the
testcase?
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Subject: [Bug ipa/83549] [7/8 Regression] error: generic thunk code fails for method ... which uses '...'
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It was reported to us in https://bugzilla.redhat.com/1511021 that way.
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Subject: [Bug target/83496] MIPS BE: wrong code generates under "-Os -mbranch-cost=1"
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
I did a small analysis. Can you please paste disassembly for the whole function
(I want to see 4006fc).
Thanks
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Subject: [Bug other/82352] [7/8 Regression] comdat-local function called by void h::i() outside its comdat
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
> Can you please the patch for original test-case? Not the reduced one?
Can you please test the patch for original test-case? Not the reduced one?
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Subject: [Bug ipa/83549] [7/8 Regression] error: generic thunk code fails for method ... which uses '...'
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #5)
> It was reported to us in https://bugzilla.redhat.com/1511021 that way.
Thanks.
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Subject: [Bug gcov-profile/83509] [8 Regression] gcov-dump-8 unable to dump any gcda files
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug gcov-profile/83669] New: Add version info to intermediate gcov file
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Subject: [Bug c++/83592] [8 Regression] Annoying -Wparentheses warnings
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--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Wed Jan 3 13:30:00 2018
New Revision: 256176
URL: https://gcc.gnu.org/viewcvs?rev=256176&root=gcc&view=rev
Log:
PR c++/83592
* decl.c (grokdeclarator): Don't warn about MVP in typename context.
* g++.dg/warn/mvp2.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/warn/mvp2.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/decl.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/83592] [8 Regression] Annoying -Wparentheses warnings
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Fixed.
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Subject: [Bug target/83632] pdt_26.f03:29:0: internal compiler error: in final_scan_insn, at final.c:3063
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83632
--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> ---
Nope, the bug is older, that was just when the test was added.
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Subject: [Bug lto/83375] partitioner partitions static arrays with label references
Date: Wed, 03 Jan 2018 13:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83375
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
> I thought there was already a bug for this, but can't find it right now.
>
You maybe confused that with the issue abould global asm statements that go to
a random partition and cause issues with LTO?
In this case, it's not work for IPA comdat, because this is pure C code.
cgraph situation:
f/2 (f) @0x7ff1b1d73000
Type: function definition analyzed
Visibility: externally_visible prevailing_def_ironly public
References: data.1957/4 (read)x/0 (read)x/0 (write)y/1 (read)y/1 (write)x/0
(read)x/0 (write)y/1 (read)y/1 (write)
Referring:
Read from file: /tmp/ccRhP0dr.o
First run: 0
Function flags: count: 1073741826 (estimated locally)
Called by: main/3 (1073741825 (estimated locally),1.00 per call)
Calls:
data.1957/4 (data) @0x7ff1b1d71200
Type: variable definition analyzed
Visibility: prevailing_def_ironly
References:
Referring: f/2 (read)
Read from file: /tmp/ccRhP0dr.o
Availability: not-ready
Varpool flags: initialized
I suggest to extend LTO partitioning to find all functions with a computed
goto. And for these, put simply all static variables into a same partition. I
expect computed goto as quite rare feature. More fine approach would be to
investigate DECL_INITIAL for LABELs.
Honza what do you think?
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Subject: [Bug target/82439] Missing (x | y) == x simplifications
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--- Comment #5 from sudi at gcc dot gnu.org ---
Patch submitted
https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00139.html
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Subject: [Bug target/83090] ICE on lm32-rtems building newlib libm (in require, at machmode.h:282)
Date: Wed, 03 Jan 2018 14:08:00 -0000
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Sebastian Huber <sebastian.huber@embedded-brains.de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |lekernel at gcc dot gnu.org,
| |sebastian.huber@embedded-br
| |ains.de
--- Comment #1 from Sebastian Huber <sebastian.huber@embedded-brains.de> ---
ICE still exists with GCC 659f92d1990e0b84a6e30f6ecd76319552faf7b7 (20180103).
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Subject: [Bug gcov-profile/83355] autofdo g++.dg/bprob/g++-bprob-1.C FAILS with ICE
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-03
Known to work| |8.0
Ever confirmed|0 |1
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Subject: [Bug ipa/83549] [7/8 Regression] error: generic thunk code fails for method ... which uses '...'
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--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Jan 3 14:15:58 2018
New Revision: 256177
URL: https://gcc.gnu.org/viewcvs?rev=256177&root=gcc&view=rev
Log:
Do not inline variadic thunks (PR ipa/83549).
2018-01-03 Martin Liska <mliska@suse.cz>
PR ipa/83549
* cif-code.def (VARIADIC_THUNK): New enum value.
* ipa-fnsummary.c (compute_fn_summary): Do not inline variadic
thunks.
2018-01-03 Martin Liska <mliska@suse.cz>
PR ipa/83549
* g++.dg/ipa/pr83549.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/ipa/pr83549.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/cif-code.def
trunk/gcc/ipa-fnsummary.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug ipa/83549] [7/8 Regression] error: generic thunk code fails for method ... which uses '...'
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Known to work| |8.0
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--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed on trunk.
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Subject: [Bug target/83670] New: m32c ICE in leaf_function_p, at final.c:4368
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Bug ID: 83670
Summary: m32c ICE in leaf_function_p, at final.c:4368
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: sebastian.huber@embedded-brains.de
Target Milestone: ---
Created attachment 43016
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43016&action=edit
Test program.
m32c-rtems5-gcc -O2 test.i
during RTL pass: pro_and_epilogue
test.c: In function 'main':
test.c:16:1: internal compiler error: in leaf_function_p, at final.c:4368
}
^
0x103e7b8b leaf_function_p()
/home/sh/src/gcc/gcc/final.c:4368
0x10c3c61f m32c_leaf_function_p
/home/sh/src/gcc/gcc/config/m32c/m32c.c:4023
0x10c3c61f m32c_emit_prologue()
/home/sh/src/gcc/gcc/config/m32c/m32c.c:4077
0x10dfb8e3 gen_prologue()
/home/sh/src/gcc/gcc/config/m32c/prologue.md:26
0x10c35e57 target_gen_prologue
/home/sh/src/gcc/gcc/config/m32c/blkmov.md:359
0x1044e9d3 make_prologue_seq
/home/sh/src/gcc/gcc/function.c:5912
0x1044ed67 thread_prologue_and_epilogue_insns()
/home/sh/src/gcc/gcc/function.c:6029
0x1044f7af rest_of_handle_thread_prologue_and_epilogue
/home/sh/src/gcc/gcc/function.c:6520
0x1044f7af execute
/home/sh/src/gcc/gcc/function.c:6562
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
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Subject: [Bug rtl-optimization/83666] [8 Regression] ICE: SIGFPE with -O2 -g --param=sccvn-max-scc-size\x10
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-03
CC| |marxin at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org,
| |richard.sandiford at linaro dot or
| |g
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r247092.
>From gcc-bugs-return-587283-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 14:21:14 2018
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Subject: [Bug rtl-optimization/83621] [8 Regression] ICE: in simplify_subreg, at simplify-rtx.c:6293 with -O -g
Date: Wed, 03 Jan 2018 14:21:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-03
CC| |marxin at gcc dot gnu.org,
| |richard.sandiford at linaro dot or
| |g
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r251504.
>From gcc-bugs-return-587285-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 14:22:36 2018
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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/83660] ICE with vec_extract inside expression statement
Date: Wed, 03 Jan 2018 14:22:00 -0000
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Target|powerpc64 |powerpc64*-*-*
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-03
CC| |meissner at gcc dot gnu.org,
| |segher at gcc dot gnu.org
Target Milestone|--- |8.0
Ever confirmed|0 |1
--- Comment #1 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Confirmed on trunk with ppc64le. I don't think the direct move instruction is
involved since the problem occurs during gimplification, though it's mystifying
to me why the target CPU should matter. Note that vec_extract has special
handling during parsing, in gcc/config/rs6000/rs6000-c.c, and this is probably
at fault. That's old code, so I imagine this bug has been out there forever.
wschmidt@pike:~/src$ $GCC_INSTALL/bin/g++ -mcpu=power7 -S pr83660.C
pr83660.C: In function 'unsigned int get_word(__vector(4) unsigned int)':
pr83660.C:5:10: internal compiler error: in verify_gimple_stmt, at
tree-cfg.c:5085
unsigned get_word(uvec32_t v)
^~~~~~~~
0x10c5e54f verify_gimple_stmt
/home/wschmidt/gcc/gcc-mainline-base/gcc/tree-cfg.c:5085
0x10c5f467 verify_gimple_in_seq_2
/home/wschmidt/gcc/gcc-mainline-base/gcc/tree-cfg.c:5200
0x10c5f427 verify_gimple_in_seq_2
/home/wschmidt/gcc/gcc-mainline-base/gcc/tree-cfg.c:5168
0x10c66237 verify_gimple_in_seq(gimple*)
/home/wschmidt/gcc/gcc-mainline-base/gcc/tree-cfg.c:5239
0x108a8047 gimplify_body(tree_node*, bool)
/home/wschmidt/gcc/gcc-mainline-base/gcc/gimplify.c:12694
0x108a84a3 gimplify_function_tree(tree_node*)
/home/wschmidt/gcc/gcc-mainline-base/gcc/gimplify.c:12784
0x10663557 cgraph_node::analyze()
/home/wschmidt/gcc/gcc-mainline-base/gcc/cgraphunit.c:670
0x10667763 analyze_functions
/home/wschmidt/gcc/gcc-mainline-base/gcc/cgraphunit.c:1131
0x1066913b symbol_table::finalize_compilation_unit()
/home/wschmidt/gcc/gcc-mainline-base/gcc/cgraphunit.c:2690
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-587286-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 14:24:59 2018
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Subject: [Bug target/83660] ICE with vec_extract inside expression statement
Date: Wed, 03 Jan 2018 14:24:00 -0000
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--- Comment #2 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Also fails with -mcpu=power6 -maltivec.
Also succeeds with -mcpu=power9.
>From gcc-bugs-return-587287-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 14:31:07 2018
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Subject: [Bug c++/83634] [8 Regression] ICE in useless_type_conversion_p, at gimple-expr.c:86
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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.
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Subject: [Bug c++/83529] ICE in canonical types differ for identical types
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |nathan at gcc dot gnu.org
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Nathan can you please take a look?
>From gcc-bugs-return-587289-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 14:37:22 2018
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Subject: [Bug c++/83529] ICE in canonical types differ for identical types
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-03
CC| |mpolacek at gcc dot gnu.org
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r240112.
>From gcc-bugs-return-587290-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 14:39:20 2018
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Subject: [Bug c++/83529] ICE in canonical types differ for identical types
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Actually with -std=c++11 it started to ICE way before that. Checking...
>From gcc-bugs-return-587291-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 14:43:13 2018
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Subject: [Bug c++/83529] ICE in canonical types differ for identical types
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Likely started with
r181118: PR c++/45114 - Support C++11 alias-declaration
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Subject: [Bug rtl-optimization/83645] [8 Regression] ICE: in get_insn_template, at final.c:2100 with -gstatement-frontiers
Date: Wed, 03 Jan 2018 14:46:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-01-03
Target Milestone|--- |8.0
Summary|ICE: in get_insn_template, |[8 Regression] ICE: in
|at final.c:2100 with |get_insn_template, at
|-gstatement-frontiers |final.c:2100 with
| |-gstatement-frontiers
Ever confirmed|0 |1
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
ICEs also with -O2 -g -fno-var-tracking and thus is a regression.
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Subject: [Bug c/39170] provide an option to silence -Wconversion warnings for bit-fields
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--- Comment #18 from Florin Iucha <florin.iucha at amd dot com> ---
Even this version creates a warning:
#include <stdint.h>
struct foo
{
unsigned bar: 30;
unsigned fill: 2;
};
struct foo test(uint32_t value)
{
struct foo foo;
foo.bar = (value >> 2) & 0x3fffffffU;
return foo;
}
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Subject: [Bug tree-optimization/83593] [8 Regression] ICE: verify_gimple failed (error: statement marked for throw, but doesn't)
Date: Wed, 03 Jan 2018 14:54:00 -0000
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Jan 3 14:53:39 2018
New Revision: 256178
URL: https://gcc.gnu.org/viewcvs?rev=256178&root=gcc&view=rev
Log:
Clean-up EH after strlen transformation (PR tree-optimization/83593).
2018-01-03 Martin Liska <mliska@suse.cz>
PR tree-optimization/83593
* tree-ssa-strlen.c: Include tree-cfg.h.
(strlen_check_and_optimize_stmt): Add new argument cleanup_eh.
(strlen_dom_walker): Add new member variable m_cleanup_cfg.
(strlen_dom_walker::strlen_dom_walker): Initialize m_cleanup_cfg
to false.
(strlen_dom_walker::before_dom_children): Call
gimple_purge_dead_eh_edges. Dump tranformation with details
dump flags.
(strlen_dom_walker::before_dom_children): Update call by adding
new argument cleanup_eh.
(pass_strlen::execute): Return TODO_cleanup_cfg if needed.
2018-01-03 Martin Liska <mliska@suse.cz>
PR tree-optimization/83593
* gcc.dg/pr83593.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr83593.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-strlen.c
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Subject: [Bug tree-optimization/83593] [8 Regression] ICE: verify_gimple failed (error: statement marked for throw, but doesn't)
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug c++/81933] [7/8 Regression] Invalid "constexpr call flows off the end of the function" error
Date: Wed, 03 Jan 2018 15:02:00 -0000
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
The c++17/c++14 difference lies in:
4321 if (cxx_dialect >= cxx17 && !BINFO_VIRTUAL_P (binfo))
4322 {
4323 tree decl = build_base_field_1 (t, basetype, next_field);
4324 DECL_FIELD_OFFSET (decl) = BINFO_OFFSET (binfo);
4325 DECL_FIELD_BIT_OFFSET (decl) = bitsize_zero_node;
4326 SET_DECL_OFFSET_ALIGN (decl, BITS_PER_UNIT);
4327 }
if I remove the cxx_dialect check, the error is gone.
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Subject: [Bug c++/83529] ICE in canonical types differ for identical types
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug target/83387] PowerPC64: Infinite loops in do_reload() with -msoft-float
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Peter Bergner <bergner at gcc dot gnu.org> changed:
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--- Comment #17 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #16)
>> How do we want to continue with this PR? Close it as WONTFIX or apply the
>> patch and close it as FIXED?
>
> If it works, and doesn't regress anything, it is pre-approved. So please
> test it on powerp64le-linux (gcc112 for example).
Sorry, I'm just getting back up to speed after the long holiday. I can kick
off a regression test and then commit when it comes back clean. Thanks.
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Subject: [Bug debug/83645] [8 Regression] ICE: in get_insn_template, at final.c:2100 with -gstatement-frontiers
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43017
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43017&action=edit
gcc8-pr83645.patch
Untested fix.
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Subject: [Bug c++/82249] [8 Regression] wrong mismatched argument pack lengths
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--- Comment #3 from Benjamin Buch <benni.buch at gmail dot com> ---
Bug is still present in trunk.
$ g++ --version
g++ (GCC) 8.0.0 20180103 (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.
>From gcc-bugs-return-587301-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 15:22:27 2018
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Subject: [Bug rtl-optimization/83621] [8 Regression] ICE: in simplify_subreg, at simplify-rtx.c:6293 with -O -g
Date: Wed, 03 Jan 2018 15:22:00 -0000
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |rsandifo at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |rsandifo at gcc dot gnu.org
--- Comment #2 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Mine.
>From gcc-bugs-return-587302-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 15:28:45 2018
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From: "benni.buch at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/82152] [7/8 Regression] ICE on invalid code in C++17 mode if inheriting constructors are used
Date: Wed, 03 Jan 2018 15:28:00 -0000
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Benjamin Buch <benni.buch at gmail dot com> changed:
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--- Comment #2 from Benjamin Buch <benni.buch at gmail dot com> ---
Its the same on valid code via user defined deduction guide:
struct Base {};
template<typename T>
struct Derived : public Base {
using Base::Base;
};
Derived() -> Derived< void >;
int main() {
Derived x{};
}
$ g++ -std=c++17 main.cpp
main.cpp: In function 'int main()':
main.cpp:11:13: internal compiler error: Segmentation fault
Derived x{};
^
0xf25bdf crash_signal
../../gcc/gcc/toplev.c:325
0xa3ae4a tree_check(tree_node*, char const*, int, char const*, tree_code)
../../gcc/gcc/tree.h:3127
0xa3ae4a build_deduction_guide
../../gcc/gcc/cp/pt.c:25495
0xa0cd8d do_class_deduction
../../gcc/gcc/cp/pt.c:25709
0xa0cd8d do_auto_deduction(tree_node*, tree_node*, tree_node*, int,
auto_deduction_context, tree_node*, int)
../../gcc/gcc/cp/pt.c:25844
0x950893 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
../../gcc/gcc/cp/decl.c:6796
0x9e94c6 cp_parser_init_declarator
../../gcc/gcc/cp/parser.c:19626
0x9f1958 cp_parser_simple_declaration
../../gcc/gcc/cp/parser.c:12968
0x9f27b8 cp_parser_block_declaration
../../gcc/gcc/cp/parser.c:12793
0x9f31f9 cp_parser_declaration_statement
../../gcc/gcc/cp/parser.c:12387
0x9d0f93 cp_parser_statement
../../gcc/gcc/cp/parser.c:10848
0x9d1f00 cp_parser_statement_seq_opt
../../gcc/gcc/cp/parser.c:11185
0x9d1fd7 cp_parser_compound_statement
../../gcc/gcc/cp/parser.c:11139
0x9e8460 cp_parser_function_body
../../gcc/gcc/cp/parser.c:21679
0x9e8460 cp_parser_ctor_initializer_opt_and_function_body
../../gcc/gcc/cp/parser.c:21716
0x9e8d10 cp_parser_function_definition_after_declarator
../../gcc/gcc/cp/parser.c:26620
0x9e99fb cp_parser_function_definition_from_specifiers_and_declarator
../../gcc/gcc/cp/parser.c:26536
0x9e99fb cp_parser_init_declarator
../../gcc/gcc/cp/parser.c:19405
0x9f1958 cp_parser_simple_declaration
../../gcc/gcc/cp/parser.c:12968
0x9f27b8 cp_parser_block_declaration
../../gcc/gcc/cp/parser.c:12793
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.
$ g++ --version
g++ (GCC) 8.0.0 20180103 (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.
>From gcc-bugs-return-587303-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 15:34:11 2018
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Subject: [Bug target/83660] ICE with vec_extract inside expression statement
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Target|powerpc64*-*-* |powerpc*-*-*
--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Doesn't fail as C, only as C++. Also fails on 32-bit.
>From gcc-bugs-return-587304-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 15:37:18 2018
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Subject: [Bug rtl-optimization/83621] [8 Regression] ICE: in simplify_subreg, at simplify-rtx.c:6293 with -O -g
Date: Wed, 03 Jan 2018 15:37:00 -0000
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--- Comment #3 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Created attachment 43018
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43018&action=edit
Candidate patch
I'm testing the attached fix.
>From gcc-bugs-return-587305-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 15:41:12 2018
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Subject: [Bug target/82439] Missing (x | y) == x simplifications
Date: Wed, 03 Jan 2018 15:41:00 -0000
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--- Comment #6 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> "(x | y) == x" is simpler than "(y & ~x) == 0" on the tree level. 2 gimple
> vs 3.
We do indeed tend to use the number of stmts to chose canonical forms on
gimple, but that's not the only possible criterion. The second form uses x only
once instead of twice ("simpler" as in: fewer uses), and there are a number of
gimple optimizations that are gated by single_use, which arguably gives some
advantage to the second form. (I am not saying we should pick the second form,
just that the choice may not be completely obvious)
>From gcc-bugs-return-587306-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 16:00:59 2018
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Subject: [Bug debug/83621] [8 Regression] ICE: in simplify_subreg, at simplify-rtx.c:6293 with -O -g
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
Component|rtl-optimization |debug
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That seems insufficient, any kind of BLKmode unary/binary/ternary RTL operation
is going to cause issues earlier or later.
>From gcc-bugs-return-587307-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 16:02:06 2018
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Subject: [Bug c++/83667] ICE in dump_function_decl on a thunk with variadic arguments
Date: Wed, 03 Jan 2018 16:02:00 -0000
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--- Comment #1 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Author: nathan
Date: Wed Jan 3 16:01:31 2018
New Revision: 256179
URL: https://gcc.gnu.org/viewcvs?rev=256179&root=gcc&view=rev
Log:
[PR c++/83667] Fix tree_dump ICE
https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00148.html
PR c++/83667
* method.c (make_alias_for): Copy DECL_CONTEXT.
PR c++/83667
* g++.dg/ipa/pr83667.C: New.
Added:
trunk/gcc/testsuite/g++.dg/ipa/pr83667.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/method.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/83667] ICE in dump_function_decl on a thunk with variadic arguments
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Nathan Sidwell <nathan at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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--- Comment #2 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Fixed r256179.
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Subject: [Bug debug/83621] [8 Regression] ICE: in simplify_subreg, at simplify-rtx.c:6293 with -O -g
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43019
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43019&action=edit
gcc8-pr83621.patch
Untested patch for that.
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From: "prathamesh3492 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83501] [8 Regression] strlen(a) not folded after strcpy(a, "...")
Date: Wed, 03 Jan 2018 16:08:00 -0000
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--- Comment #5 from prathamesh3492 at gcc dot gnu.org ---
Author: prathamesh3492
Date: Wed Jan 3 16:07:32 2018
New Revision: 256180
URL: https://gcc.gnu.org/viewcvs?rev=256180&root=gcc&view=rev
Log:
2018-01-03 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
PR tree-optimization/83501
* tree-ssa-strlen.c (get_string_cst): New.
(handle_char_store): Call get_string_cst.
testsuite/
* gcc.dg/tree-ssa/pr83501.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr83501.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-strlen.c
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Subject: [Bug tree-optimization/83501] [8 Regression] strlen(a) not folded after strcpy(a, "...")
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prathamesh3492 at gcc dot gnu.org changed:
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--- Comment #6 from prathamesh3492 at gcc dot gnu.org ---
Fixed.
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Subject: [Bug c++/83556] [7/8 Regression] ICE in gimplify_expr, at gimplify.c:12004
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug tree-optimization/83501] [8 Regression] strlen(a) not folded after strcpy(a, "...")
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--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Wed Jan 3 16:26:49 2018
New Revision: 256181
URL: https://gcc.gnu.org/viewcvs?rev=256181&root=gcc&view=rev
Log:
PR tree-optimization/83501 - strlen(a) not folded after strcpy(a, "...")
gcc/testsuite/ChangeLog:
* c-c++-common/Warray-bounds-3.c: Remove xfail.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/c-c++-common/Warray-bounds-3.c
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From: "nathan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83529] ICE in canonical types differ for identical types
Date: Wed, 03 Jan 2018 16:48:00 -0000
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--- Comment #5 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
template <typename T> int Foo (T);
template <int> class TPL;
template <int I>
constexpr TPL<Foo (I)> Foo (); // #1
template <int I>
constexpr TPL<Foo (I)> Foo (); // #2
What I think is happening is that the definition at #1 changes the overload set
to which 'Foo' binds. Thus in #2 the 'Foo (I)' finds something different. I
don't think we prune the overload set until later?
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Subject: [Bug rtl-optimization/83629] [7/8 Regression] ICE: in decompose_normal_address, at rtlanal.c:6329 with -O2 -fPIC -frename-registers --param=sched-autopref-queue-depth=nnn
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rsandifo at gcc dot gnu.org,
| |segher at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So, the ICE is in the code introduced for PR55049, which doesn't like the
powerpc32 load_toc_v4_PIC_2 and similar patterns.
I think those are invalid RTL, because minus of 2 immediates should be really
wrapped in const and indeed doing:
--- gcc/config/rs6000/rs6000.md.jj 2018-01-03 10:20:15.819537262 +0100
+++ gcc/config/rs6000/rs6000.md 2018-01-03 17:39:47.408873326 +0100
@@ -10647,8 +10647,8 @@
(define_insn "load_toc_v4_PIC_2"
[(set (match_operand:SI 0 "gpc_reg_operand" "=r")
(mem:SI (plus:SI (match_operand:SI 1 "gpc_reg_operand" "b")
- (minus:SI (match_operand:SI 2 "immediate_operand" "s")
- (match_operand:SI 3 "immediate_operand" "s")))))]
+ (const:SI (minus:SI (match_operand:SI 2 "immediate_operand" "s")
+ (match_operand:SI 3 "immediate_operand"
"s"))))))]
"TARGET_ELF && DEFAULT_ABI == ABI_V4 && flag_pic == 2"
"lwz %0,%2-%3(%1)"
[(set_attr "type" "load")])
fixes the ICE (but the powerpc backend has several other spots with this).
Or decompose_normal_address needs to be tweaked to handle these, like:
--- gcc/rtlanal.c.jj 2018-01-03 10:19:55.748534052 +0100
+++ gcc/rtlanal.c 2018-01-03 17:48:48.228033733 +0100
@@ -6333,6 +6333,11 @@ decompose_normal_address (struct address
set_address_disp (info, loc, inner);
else if (GET_CODE (*inner) == UNSPEC)
set_address_segment (info, loc, inner);
+ /* This is used in the powerpc backend without CONST wrapping it. */
+ else if (GET_CODE (*inner) == MINUS
+ && CONSTANT_P (XEXP (*inner, 0))
+ && CONSTANT_P (XEXP (*inner, 1)))
+ set_address_disp (info, loc, inner);
else
{
/* The only other possibilities are a base or an index. */
All patches completely untested.
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/83569] New: Wrong constant folding
Date: Wed, 03 Jan 2018 16:56:00 -0000
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Bug ID: 83569
Summary: Wrong constant folding
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: ishiura-compiler at ml dot kwansei.ac.jp
Target Milestone: ---
GCC 8.0 for x86_64 miscompiles the following code.
% cat test.c
int a[2] = {0,1};
int x = 129;
int main (void)
{
volatile int v = 0;
int t = x;
for (int i = 0; i < (1+v+v+v+v+v+v+v+v+a[a[0]]); i++) {
t = a[(signed char)(130-x)];
}
if (t != 1) __builtin_abort();
return 0;
}
% gcc-8.0.0 test.c
% ./a.out
% gcc-8.0.0 test.c -O3
% ./a.out
zsh: abort (core dumped) ./a.out
% gcc-8.0.0 -v
Using built-in specs.
COLLECT_GCC=gcc-8.0.0
COLLECT_LTO_WRAPPER=/home/cappie/opt/gcc-8.0.0/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --prefix=/home/cappie/opt/gcc-8.0.0 --disable-nls
--disable-multilib --program-suffix=-8.0.0 --enable-languages=c
Thread model: posix
gcc version 8.0.0 20171215 (experimental) (GCC)
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
*** Bug 83579 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-587316-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 16:56:51 2018
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83579] New: Wrong constant folding
Date: Wed, 03 Jan 2018 16:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83579
Bug ID: 83579
Summary: Wrong constant folding
Product: gcc
Version: 8.0
Status: RESOLVED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: ishiura-compiler at ml dot kwansei.ac.jp
CC: dmalcolm at gcc dot gnu.org
Target Milestone: ---
Status: RESOLVED
CC: dmalcolm at gcc dot gnu.org
Resolution: DUPLICATE
GCC 8.0 for x86_64 miscompiles the following code.
% cat test.c
int a[2] = {0,1};
int x = 129;
int main (void)
{
volatile int v = 0;
int t = x;
for (int i = 0; i < (1+v+v+v+v+v+v+v+v+a[a[0]]); i++) {
t = a[(signed char)(130-x)];
}
if (t != 1) __builtin_abort();
return 0;
}
% gcc-8.0.0 test.c
% ./a.out
% gcc-8.0.0 test.c -O3
% ./a.out
zsh: abort (core dumped) ./a.out
% gcc-8.0.0 -v
Using built-in specs.
COLLECT_GCC=gcc-8.0.0
COLLECT_LTO_WRAPPER=/home/cappie/opt/gcc-8.0.0/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --prefix=/home/cappie/opt/gcc-8.0.0 --disable-nls
--disable-multilib --program-suffix=-8.0.0 --enable-languages=c
Thread model: posix
gcc version 8.0.0 20171215 (experimental) (GCC)
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
This appears to have been filed twice; closing this instance as a duplicate (of
PR 83569).
*** This bug has been marked as a duplicate of bug 83569 ***
>From gcc-bugs-return-587318-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 17:09:13 2018
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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/83529] ICE in canonical types differ for identical types
Date: Wed, 03 Jan 2018 17:09:00 -0000
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--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Nathan Sidwell from comment #5)
> template <typename T> int Foo (T);
>
> template <int> class TPL;
>
> template <int I>
> constexpr TPL<Foo (I)> Foo (); // #1
>
> template <int I>
> constexpr TPL<Foo (I)> Foo (); // #2
>
> What I think is happening is that the definition at #1 changes the overload
> set to which 'Foo' binds. Thus in #2 the 'Foo (I)' finds something
> different. I don't think we prune the overload set until later?
Hmm, I think we shouldn't be binding Foo at all, it's a dependent name. 17.6.2:
Such names are unbound and are looked up at the point of the template
instantiation (17.6.4.1) in both the context of the template definition and the
context of the point of instantiation.
>From gcc-bugs-return-587319-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 17:16:24 2018
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Subject: [Bug c/83586] [8 regression] Invalid -Wformat-truncation on stdio2.h
Date: Wed, 03 Jan 2018 17:16:00 -0000
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--- Comment #2 from Sylvestre Ledru <sylvestre at debian dot org> ---
Created attachment 43020
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43020&action=edit
preprocessed file
Here is the same issue on a smaller file.
>From gcc-bugs-return-587320-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 17:18:00 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/83585] [8 Regression] Assembler messages: Error: can't resolve `.text' {.text section} - `.LCOLDB0' {.text.unlikely section}
Date: Wed, 03 Jan 2018 17:18:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |jakub at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I have a patch.
>From gcc-bugs-return-587321-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 17:21:55 2018
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Subject: [Bug c/83586] [8 regression] Invalid reported line with -Wformat-truncation on stdio2.h
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Sylvestre Ledru <sylvestre at debian dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[8 regression] Invalid |[8 regression] Invalid
|-Wformat-truncation on |reported line with
|stdio2.h |-Wformat-truncation on
| |stdio2.h
--- Comment #3 from Sylvestre Ledru <sylvestre at debian dot org> ---
Actually, the issue is that the line showed should be call to print like
NS_tsnprintf(spath, sizeof(spath)/sizeof(spath[0]),
NS_T("%s/updating/%d.patch"), gWorkingDirPath, mPatchIndex);
and not the function name.
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From: "dank at kegel dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug preprocessor/61638] "warning: multi-line comment" unclear and has false positives
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dank at kegel dot com changed:
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CC| |dank at kegel dot com
--- Comment #6 from dank at kegel dot com ---
g++ 5.4.0 from ubuntu 16.04 suffers from this when compiling
https://bitbucket.org/chromiumembedded/cef/src/54a015f785c08083c21ec5360e154a5af6f52c57/tests/ceftests/test_util.h
:
In file included from tests/ceftests/download_unittest.cc:9:0:
tests/ceftests/test_util.h:167:1: error: multi-line comment [-Werror=comment]
// #define MY_TEST_GROUP(test_name, test_mode) \
^
It's just a code example, nicely commented out, and the compiler
falsely complains of a multiline comment.
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Subject: [Bug debug/83585] [8 Regression] Assembler messages: Error: can't resolve `.text' {.text section} - `.LCOLDB0' {.text.unlikely section}
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with my r254989 aka PR82718 fix.
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Subject: [Bug c++/83529] ICE in canonical types differ for identical types
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--- Comment #7 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
int Foo (void *);
template <int> class TPL;
template <int I> TPL<Foo (I)> Baz ();
int Foo (float);
template <int I> TPL<Foo (I)> Baz ();
constexpr int Foo (int) {return 0;}int Foo (int);
A less templatey case.
83529.ii:6:26: error: call to non-'constexpr' function 'int Foo(void*)'
template <int I> TPL<Foo (I)> Baz ();
~~~~^~~
83529.ii:10:36: internal compiler error: canonical types differ for identical
types 'TPL<Foo(I)>' and 'TPL<Foo(I)>'
>From gcc-bugs-return-587325-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 17:43:38 2018
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Subject: [Bug c/83671] New: Fix for false positive reported by -Wstringop-overflow does not work with inlining
Date: Wed, 03 Jan 2018 17:43:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83671
Bug ID: 83671
Summary: Fix for false positive reported by -Wstringop-overflow
does not work with inlining
Product: gcc
Version: 8.0
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Fix for bug 83373 does not work well with inlining:
[code]
#include <stdint.h>
#include <string.h>
char dest[20];
char src[10];
__attribute((nonnull(1, 2)))
inline char* my_strcpy(char* __restrict__ dst, const char* __restrict__ src,
size_t size)
{
size_t len = strlen(src);
if (len < size)
memcpy(dst, src, len + 1);
else
{
memcpy(dst, src, size - 1);
dst[size - 1] = '\0';
}
return dst;
}
inline void func1()
{
my_strcpy(dest, src, sizeof(dest));
}
void func2()
{
func1();
}
[/code]
[out]
$ g++ -c -o test.o test.cc -Wall -Wstringop-overflow=2 -O1
In function ‘char* my_strcpy(char*, const char*, size_t)’,
inlined from ‘void func2()’ at test.cc:23:14:
test.cc:15:15: warning: ‘void* memcpy(void*, const void*, size_t)’ forming
offset [11, 19] is out of the bounds [0, 10] of object ‘src’ with type ‘char
[10]’ [-Warray-bounds]
memcpy(dst, src, size - 1);
~~~~~~^~~~~~~~~~~~~~~~~~~~
test.cc: In function ‘void func2()’:
test.cc:5:6: note: ‘src’ declared here
char src[10];
^~~
In function ‘char* my_strcpy(char*, const char*, size_t)’,
inlined from ‘void func2()’ at test.cc:23:14:
test.cc:15:15: warning: ‘void* memcpy(void*, const void*, size_t)’ reading 19
bytes from a region of size 10 [-Wstringop-overflow=]
memcpy(dst, src, size - 1);
~~~~~~^~~~~~~~~~~~~~~~~~~~
$ gcc --version
gcc (GCC) 8.0.0 20171231 (experimental)
[/out]
>From gcc-bugs-return-587326-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 17:43:59 2018
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Subject: [Bug debug/83585] [8 Regression] Assembler messages: Error: can't resolve `.text' {.text section} - `.LCOLDB0' {.text.unlikely section}
Date: Wed, 03 Jan 2018 17:43:00 -0000
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43021
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43021&action=edit
gcc8-pr83585.patch
Untested fix. Another option would be to introduce a new flag next to
has_bb_partition, e.g. switched_bb_partitions, and use it in
dwarf2out.c/dbxout.c/rs6000.c where we want to test whether there will be or
was any NOTE_INSN_SWITCHED_SECTIONS note or not.
>From gcc-bugs-return-587327-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 17:54:48 2018
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Subject: [Bug middle-end/81897] [6/7/8 Regression] spurious -Wmaybe-uninitialized warning
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Aldy Hernandez <aldyh at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |aldyh at gcc dot gnu.org
--- Comment #9 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
I may regret this...but I'll take a stab.
>From gcc-bugs-return-587328-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 17:54:58 2018
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Subject: [Bug tree-optimization/83569] Wrong constant folding
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2018-01-03
CC| |mpolacek at gcc dot gnu.org
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Seems to fail since r225311. Use -O3 -ftree-vectorize.
>From gcc-bugs-return-587329-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 17:55:45 2018
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Subject: [Bug tree-optimization/83569] [6/7/8 Regression] Wrong constant folding
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |6.6
Summary|Wrong constant folding |[6/7/8 Regression] Wrong
| |constant folding
>From gcc-bugs-return-587330-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 18:00:53 2018
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Subject: [Bug c++/83529] ICE in canonical types differ for identical types
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--- Comment #8 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Jason Merrill from comment #6)
> (In reply to Nathan Sidwell from comment #5)
> > template <typename T> int Foo (T);
> >
> > template <int> class TPL;
> >
> > template <int I>
> > constexpr TPL<Foo (I)> Foo (); // #1
> >
> > template <int I>
> > constexpr TPL<Foo (I)> Foo (); // #2
> >
> > What I think is happening is that the definition at #1 changes the overload
> > set to which 'Foo' binds. Thus in #2 the 'Foo (I)' finds something
> > different. I don't think we prune the overload set until later?
>
> Hmm, I think we shouldn't be binding Foo at all, it's a dependent name.
As Nathan points out on IRC, it isn't a dependent name because I is not
type-dependent.
In that case, we ought to be able to resolve the overload to a particular
candidate rather than keep the whole overload set around. For simplicity,
perhaps only in the case of calling a non-member function.
>From gcc-bugs-return-587331-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 18:22:39 2018
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Subject: [Bug tree-optimization/51513] Only partially optimizes away __builtin_unreachable switch default case
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Peter Bergner <bergner at gcc dot gnu.org> changed:
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--- Comment #11 from Peter Bergner <bergner at gcc dot gnu.org> ---
Closing as fixed.
>From gcc-bugs-return-587332-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 18:22:44 2018
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Subject: [Bug tree-optimization/80724] [8 Regression] gcc.target/aarch64/pr62178.c failed because of r247885
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Wilco <wilco at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |wilco at gcc dot gnu.org
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--- Comment #3 from Wilco <wilco at gcc dot gnu.org> ---
Latest trunk generates:
.L7:
ldr s2, [x1, 4]!
ldr q1, [x0], 124
mla v0.4s, v1.4s, v2.s[0]
cmp x0, x2
bne .L7
So that's fixed (r252086).
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Subject: [Bug middle-end/83654] -fstack-clash-protection probes below the stack pointer for VLA with constant size
Date: Wed, 03 Jan 2018 18:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83654
Jeffrey A. Law <law at redhat dot com> changed:
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----------------------------------------------------------------------------
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Resolution|--- |FIXED
--- Comment #4 from Jeffrey A. Law <law at redhat dot com> ---
Fixed on the trunk.
>From gcc-bugs-return-587333-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 18:23:04 2018
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Subject: [Bug middle-end/83654] -fstack-clash-protection probes below the stack pointer for VLA with constant size
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83654
--- Comment #3 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed Jan 3 18:22:28 2018
New Revision: 256182
URL: https://gcc.gnu.org/viewcvs?rev=256182&root=gcc&view=rev
Log:
PR middle-end/83654
* explow.c (anti_adjust_stack_and_probe_stack_clash): Test a
non-constant residual for zero at runtime and avoid probing in
that case. Reorganize code for trailing problem to mirror handling
of the residual.
PR middle-end/83654
* gcc.target/i386/stack-check-18.c: New test.
* gcc.target/i386/stack-check-19.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/stack-check-18.c
trunk/gcc/testsuite/gcc.target/i386/stack-check-19.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/explow.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-587335-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 18:28:14 2018
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Subject: [Bug c++/83672] New: Unable to take the address of a template function parameter pack specialization with a function argument
Date: Wed, 03 Jan 2018 18:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83672
Bug ID: 83672
Summary: Unable to take the address of a template function
parameter pack specialization with a function argument
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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Can't take the address of a template function specialization if the template
function has a parameter pack and one of the arguments to the parameter pack
expansion is a function type-id.
Without resorting to further word torture, an example might clarify.
template <typename ...PP>
void f01(PP...)
{ }
int f00() { return 0; }
int
main()
{
f01<int()>(f00); // OK, call specialization
void (*fp01)(int) = f01<int>; // OK, address of int specialization
void (*fp02)(int()) = f01<int(*)()>; // compiles OK, but, um...
void (*fp03)(int()) = f01<int()>; // nope nope nope
}
14 : <source>:14:25: error: no matches converting function 'f01' to type 'void
(*)(int (*)())'
void (*fp03)(int()) = f01<int()>; // nope nope nope
^~~~~~~~~~
2 : <source>:2:8: note: candidate is: template<class ... PP> void f01(PP ...)
void f01(PP...)
^~~
Please note that clang5 and ICC18 both accept this code.
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Subject: [Bug tree-optimization/83580] [6/7/8 Regression] Wrong code caused by vectorization
Date: Wed, 03 Jan 2018 18:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83580
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
*** Bug 83569 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-587336-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 18:31:38 2018
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Subject: [Bug tree-optimization/83569] [6/7/8 Regression] Wrong constant folding
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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CC| |jakub at gcc dot gnu.org
Resolution|--- |DUPLICATE
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It has even more dups. PR83580 contains extra analysis.
*** This bug has been marked as a duplicate of bug 83580 ***
>From gcc-bugs-return-587338-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 18:41:16 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/83673] New: missing strlen optimization on multiple strcpy calls with same length strings
Date: Wed, 03 Jan 2018 18:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83673
Bug ID: 83673
Summary: missing strlen optimization on multiple strcpy calls
with same length strings
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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GCC is able to track the length of the string copied using the single strcpy
call in function f() below but it can't do the same for the equivalent code in
function g(). It would be a useful enhancement if it could.
$ cat z.c && gcc -O2 -S -Wall -fdump-tree-optimized=/dev/stdout z.c
char d[8];
void f (int i)
{
__builtin_strcpy (d, i < 0 ? "123456" : "654321");
if (__builtin_strlen (d) != 6)
__builtin_abort ();
}
void g (int i)
{
if (i < 0)
__builtin_strcpy (d, "123456");
else
__builtin_strcpy (d, "654321");
if (__builtin_strlen (d) != 6)
__builtin_abort ();
}
;; Function f (f, funcdef_no=0, decl_uid=1953, cgraph_uid=0, symbol_order=1)
f (int i)
{
char[7] * iftmp.0_7;
<bb 2> [local count: 1073741825]:
if (i_3(D) < 0)
goto <bb 4>; [36.00%]
else
goto <bb 3>; [64.00%]
<bb 3> [local count: 687194769]:
<bb 4> [local count: 1073312329]:
# iftmp.0_7 = PHI <"123456"(2), "654321"(3)>
__builtin_memcpy (&d, iftmp.0_7, 7); [tail call]
return;
}
;; Function g (g, funcdef_no=1, decl_uid=1956, cgraph_uid=1, symbol_order=2)
g (int i)
{
long unsigned int _1;
<bb 2> [local count: 1073741825]:
if (i_3(D) < 0)
goto <bb 3>; [36.00%]
else
goto <bb 4>; [64.00%]
<bb 3> [local count: 386547057]:
__builtin_memcpy (&d, "123456", 7);
goto <bb 5>; [100.00%]
<bb 4> [local count: 687194768]:
__builtin_memcpy (&d, "654321", 7);
<bb 5> [local count: 1073741825]:
_1 = __builtin_strlen (&d);
if (_1 != 6)
goto <bb 6>; [0.00%]
else
goto <bb 7>; [99.96%]
<bb 6> [count: 0]:
__builtin_abort ();
<bb 7> [local count: 1073312327]:
return;
}
>From gcc-bugs-return-587339-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 18:46:26 2018
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Subject: [Bug debug/83666] [8 Regression] ICE: SIGFPE with -O2 -g --param=sccvn-max-scc-size\x10
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----------------------------------------------------------------------------
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Component|rtl-optimization |debug
Target Milestone|--- |8.0
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Subject: [Bug debug/83666] [8 Regression] ICE: SIGFPE with -O2 -g --param=sccvn-max-scc-size\x10
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What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43022
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43022&action=edit
gcc8-pr83666.patch
Untested fix.
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From: "bugzilla@poradnik-webmastera.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/82915] Please mark intrinsics as constexpr
Date: Wed, 03 Jan 2018 19:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82915
--- Comment #2 from Daniel Fruzynski <bugzilla@poradnik-webmastera.com> ---
SIMD ISAa for other CPU types (e.g. ARM/AARCH64 NEON) also can benefit from
this.
>From gcc-bugs-return-587342-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 19:33:20 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/83674] New: strcpy folding of small strings defeats strlen optimization
Date: Wed, 03 Jan 2018 19:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83674
Bug ID: 83674
Summary: strcpy folding of small strings defeats strlen
optimization
Product: gcc
Version: 8.0
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Here's another test case showing the detrimental effect of early folding into
MEM_REFs that the strlen pass isn't equipped to handle. The first dump that
shows the MEM_REF is forwprop1. The interesting aspect of this test case is
that whether or not the optimization takes place depends on both the size of
the destination and the lengths of the source strings.
$ cat z.c && gcc -O2 -S -Wall -fdump-tree-optimized=/dev/stdout z.c
char d[8];
#define A1 "123456"
#define A2 "654321"
const char a1[] = A1;
const char a2[] = A2;
void f7 (int i)
{
__builtin_strcpy (d, i < 0 ? A1 : A2);
if (__builtin_strlen (d) != sizeof A1 - 1) // optimized
__builtin_abort ();
}
void g7 (int i)
{
__builtin_strcpy (d, i < 0 ? a1 : a2);
if (__builtin_strlen (d) != sizeof a1 - 1) // optimized
__builtin_abort ();
}
#define B1 "1234567"
#define B2 "7654321"
const char b1[] = B1;
const char b2[] = B2;
void f8 (int i)
{
__builtin_strcpy (d, i < 0 ? B1 : B2);
if (__builtin_strlen (d) != sizeof B1 - 1) // not optimized
__builtin_abort ();
}
void g8 (int i)
{
__builtin_strcpy (d, i < 0 ? B1 : B2);
if (__builtin_strlen (d) != sizeof b1 - 1) // not optimized
__builtin_abort ();
}
;; Function f7 (f7, funcdef_no=0, decl_uid=1955, cgraph_uid=0, symbol_order=3)
f7 (int i)
{
char[7] * iftmp.0_7;
<bb 2> [local count: 1073741825]:
if (i_3(D) < 0)
goto <bb 4>; [36.00%]
else
goto <bb 3>; [64.00%]
<bb 3> [local count: 687194769]:
<bb 4> [local count: 1073312329]:
# iftmp.0_7 = PHI <"123456"(2), "654321"(3)>
__builtin_memcpy (&d, iftmp.0_7, 7); [tail call]
return;
}
;; Function g7 (g7, funcdef_no=1, decl_uid=1958, cgraph_uid=1, symbol_order=4)
g7 (int i)
{
const char * iftmp.1_7;
<bb 2> [local count: 1073741825]:
if (i_3(D) < 0)
goto <bb 4>; [36.00%]
else
goto <bb 3>; [64.00%]
<bb 3> [local count: 687194769]:
<bb 4> [local count: 1073312329]:
# iftmp.1_7 = PHI <&a1(2), &a2(3)>
__builtin_memcpy (&d, iftmp.1_7, 7); [tail call]
return;
}
;; Function f8 (f8, funcdef_no=2, decl_uid=1963, cgraph_uid=2, symbol_order=7)
f8 (int i)
{
long unsigned int _1;
long unsigned int _4;
<bb 2> [local count: 1073741825]:
if (i_3(D) < 0)
goto <bb 3>; [36.00%]
else
goto <bb 4>; [64.00%]
<bb 3> [local count: 386547056]:
<bb 4> [local count: 1073741825]:
# _4 = PHI <13847469359445559(2), 15540725856023089(3)>
MEM[(char * {ref-all})&d] = _4;
_1 = __builtin_strlen (&d);
if (_1 != 7)
goto <bb 5>; [0.00%]
else
goto <bb 6>; [99.96%]
<bb 5> [count: 0]:
__builtin_abort ();
<bb 6> [local count: 1073312327]:
return;
}
;; Function g8 (g8, funcdef_no=5, decl_uid=1966, cgraph_uid=3, symbol_order=8)
g8 (int i)
{
<bb 2> [local count: 1073741826]:
f8 (i_2(D)); [tail call]
return;
}
>From gcc-bugs-return-587343-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 20:29:25 2018
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Subject: [Bug tree-optimization/81611] [8 Regression] gcc un-learned loop / post-increment optimization
Date: Wed, 03 Jan 2018 20:29:00 -0000
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--- Comment #15 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
As we create_mem_ref within ivopts, create_mem_ref_raw requires a
valid_mem_ref_p, which in memory_address_addr_space_p calls
targetm.addr_space.legitimate_address_p, and that's
avr_addr_space_legitimate_address_p, that calls avr_legitimate_address_p, that
rejects negative offsets to a REG. That's where avr loses, compared with x86
and arm.
Because of this rejected address offset, we end up creating _16 = str_11 +
65535. That eventually gets simplified to _16 = str_6 (in forwprop, no less),
but the str_11 = str_6 + 1 stmt remains because of the use in the phi node, and
it appears before the MEM_REF.
Now, the reason we validate the address is that create_mem_ref calls
create_mem_ref_raw with verify enabled. Even though the letter might end up
creating a machine-independent MEM_REF, we end up constraining it according to
machine-dependent addressing limitations anyway.
>From gcc-bugs-return-587344-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 20:38:17 2018
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Subject: [Bug c++/83555] Unnecessary null check when static_cast is used with references.
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Jan 3 20:37:41 2018
New Revision: 256186
URL: https://gcc.gnu.org/viewcvs?rev=256186&root=gcc&view=rev
Log:
PR c++/83555
* typeck.c (build_static_cast_1): For static casts to reference types,
call build_base_path with flag_delete_null_pointer_checks as nonnull
instead of always false. When -fsanitize=null, call
ubsan_maybe_instrument_reference on the NULL reference INTEGER_CST.
* cp-gimplify.c (cp_genericize_r): Don't walk subtrees of UBSAN_NULL
call if the first argument is INTEGER_CST with REFERENCE_TYPE.
* g++.dg/opt/pr83555.C: New test.
* g++.dg/ubsan/pr83555.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/opt/pr83555.C
trunk/gcc/testsuite/g++.dg/ubsan/pr83555.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/cp-gimplify.c
trunk/gcc/cp/typeck.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-587345-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 20:42:37 2018
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Subject: [Bug target/83496] MIPS BE: wrong code generates under "-Os -mbranch-cost=1"
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--- Comment #5 from Hauke Mehrtens <gcc@hauke-m.de> ---
The description already contains the full function incl. 4006fc.
Do you need more?
>From gcc-bugs-return-587347-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 20:44:40 2018
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Subject: [Bug c/83559] [8 regression] -Wsuggest-attribute=const conflicts with -Wattributes warning about const attribute on function returning void
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Fixed in r256188.
>From gcc-bugs-return-587346-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 20:44:27 2018
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Subject: [Bug c/83559] [8 regression] -Wsuggest-attribute=const conflicts with -Wattributes warning about const attribute on function returning void
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--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Wed Jan 3 20:43:47 2018
New Revision: 256188
URL: https://gcc.gnu.org/viewcvs?rev=256188&root=gcc&view=rev
Log:
PR c/83559 - -Wsuggest-attribute=const conflicts with -Wattributes warning
about const attribute on function returning void
gcc/ChangeLog:
PR c/83559
* doc/extend.texi (attribute const): Fix a typo.
* ipa-pure-const.c ((warn_function_const, warn_function_pure): Avoid
issuing -Wsuggest-attribute for void functions.
gcc/testsuite/ChangeLog:
PR c/83559
* gcc.dg/const-2.c: New test.
* gcc.dg/pure-3.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/const-2.c
trunk/gcc/testsuite/gcc.dg/pure-3.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/doc/extend.texi
trunk/gcc/ipa-pure-const.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/83496] MIPS BE: wrong code generates under "-Os -mbranch-cost=1"
Date: Wed, 03 Jan 2018 20:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83496
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |ASSIGNED
--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Hauke Mehrtens from comment #5)
> The description already contains the full function incl. 4006fc.
> Do you need more?
Sorry, you are of course right. Let me try to write a reduction script.
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Subject: [Bug tree-optimization/81611] [8 Regression] gcc un-learned loop / post-increment optimization
Date: Wed, 03 Jan 2018 20:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81611
--- Comment #16 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Even if create_mem_ref_raw created a MEM_REF, we'd still allocate a new pseudo
for the reg - 1 at cfgexpand, and that ends up preventing the post_inc
addressing mode from being selected.
The more I think about it, the more I conclude we have to bite the bullet and
support post_inc addressing modes in auto_inc_dec, even with increments saved
on another pseudo before the memory uses. Not just for iv uses, but also for
linear code, mainly because the IR we generate for post-inc, all the way from
the beginning, makes it more likely that the increment will be logically before
the use of the old value as an address. I was trying to avoid that, but at
this point anything else feels like papering over the problem.
A smarter addressing-mode-aware middle end could tentatively generate off-by-1
base addresses so as to enable otherwise invalid addresses and subsequent
post_inc transformations, but... if the transformation doesn't take place, we
may end up worse off.
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Subject: [Bug debug/83645] [8 Regression] ICE: in get_insn_template, at final.c:2100 with -gstatement-frontiers
Date: Wed, 03 Jan 2018 20:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83645
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Jan 3 20:58:48 2018
New Revision: 256189
URL: https://gcc.gnu.org/viewcvs?rev=256189&root=gcc&view=rev
Log:
PR debug/83645
* var-tracking.c (delete_vta_debug_insn): New inline function.
(delete_vta_debug_insns): Add USE_CFG argument, if true, walk just
insns from get_insns () to NULL instead of each bb separately.
Use delete_vta_debug_insn. No longer static.
(vt_debug_insns_local, variable_tracking_main_1): Adjust
delete_vta_debug_insns callers.
* rtl.h (delete_vta_debug_insns): Declare.
* final.c (rest_of_handle_final): Call delete_vta_debug_insns
instead of variable_tracking_main.
* gcc.dg/pr83645.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr83645.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/final.c
trunk/gcc/rtl.h
trunk/gcc/testsuite/ChangeLog
trunk/gcc/var-tracking.c
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Subject: [Bug debug/83621] [8 Regression] ICE: in simplify_subreg, at simplify-rtx.c:6293 with -O -g
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Jan 3 20:59:50 2018
New Revision: 256190
URL: https://gcc.gnu.org/viewcvs?rev=256190&root=gcc&view=rev
Log:
PR debug/83621
* cfgexpand.c (expand_debug_expr): Return NULL if mode is
BLKmode for ternary, binary or unary expressions.
* gcc.dg/pr83621.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr83621.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/cfgexpand.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/83641] -fstack-clash-protection generates incorrect CFI on i386
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--- Comment #4 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed Jan 3 21:25:10 2018
New Revision: 256191
URL: https://gcc.gnu.org/viewcvs?rev=256191&root=gcc&view=rev
Log:
PR target/83641
* config/i386/i386.c (ix86_adjust_stack_and_probe_stack_clash): For
noreturn probe, use gen_pop instead of ix86_emit_restore_reg_using_pop,
only set RTX_FRAME_RELATED_P on both the push and pop if cfa_reg is sp
and add REG_CFA_ADJUST_CFA notes in that case to both insns.
PR target/83641
* config/i386/i386.c (ix86_adjust_stack_and_probe_stack_clash): Do not
explicitly probe *sp in a noreturn function if there were any callee
register saves or frame pointer is needed.
PR target/83641
* gcc.target/i386/stack-check-17.c: New test.
* gcc.target/i386/stack-check-12.c: Drop unnecessary asm.
Added:
trunk/gcc/testsuite/gcc.target/i386/stack-check-17.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/i386/stack-check-12.c
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Subject: [Bug target/83641] -fstack-clash-protection generates incorrect CFI on i386
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Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Jeffrey A. Law <law at redhat dot com> ---
Fixed on the trunk.
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Subject: [Bug middle-end/83675] New: [8 regression] Many SPARC tests FAIL with unrecognizable insn
Date: Wed, 03 Jan 2018 21:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83675
Bug ID: 83675
Summary: [8 regression] Many SPARC tests FAIL with
unrecognizable insn
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: ebotcazou at gcc dot gnu.org, rsandifo at gcc dot gnu.org
Target Milestone: ---
Host: sparc-sun-solaris2.*
Target: sparc-sun-solaris2.*
Build: sparc-sun-solaris2.*
Between 20180102 and 20180103, man SPARC tests started to FAIL like this:
FAIL: gcc.dg/vect/pr43842.c (internal compiler error)
FAIL: gcc.dg/vect/pr43842.c (test for excess errors)
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/vect/pr43842.c: In function
'int161':
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/vect/pr43842.c:40:1: error:
unrecognizable insn:
(insn 28 27 29 5 (parallel [
(set (reg:SI 131)
(plus:SI (reg:SI 129)
(const_int 0 [0])))
(set (zero_extract:DI (reg:DI 102 %gsr)
(const_int 32 [0x20])
(const_int 32 [0x20]))
(zero_extend:DI (plus:SI (reg:SI 129)
(const_int 0 [0]))))
]) -1
(nil))
during RTL pass: vregs
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/vect/pr43842.c:40:1: internal
compiler error: in extract_insn, at recog.c:2304
0xa07177 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/vol/gcc/src/hg/trunk/local/gcc/rtl-error.c:108
0xa071a7 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/vol/gcc/src/hg/trunk/local/gcc/rtl-error.c:116
0x9c8027 extract_insn(rtx_insn*)
/vol/gcc/src/hg/trunk/local/gcc/recog.c:2304
0x72f38b instantiate_virtual_regs_in_insn
/vol/gcc/src/hg/trunk/local/gcc/function.c:1646
0x72f38b instantiate_virtual_regs
/vol/gcc/src/hg/trunk/local/gcc/function.c:1967
0x72f38b execute
/vol/gcc/src/hg/trunk/local/gcc/function.c:2016
The failure can be reproduced with
$ cc1 -fpreprocessed pr43842.i -quiet -mcpu=ultrasparc -mvis -O2
-ftree-vectorize -o pr43842.s
A reghunt identified this patch as the culprit:
The first bad revision is:
changeset: 43046:975c3cdb3b00
user: rsandifo@138bc75d-0d04-0410-961f-82ee72b054a4
date: Tue Jan 02 18:26:27 2018 +0000
summary: Remove vec_perm_const optab
2018-01-02 Richard Sandiford <richard.sandiford@linaro.org>
* Makefile.in (OBJS): Add vec-perm-indices.o.
* vec-perm-indices.h: New file.
* vec-perm-indices.c: Likewise.
* target.h (vec_perm_indices): Replace with a forward class
declaration.
(auto_vec_perm_indices): Move to vec-perm-indices.h.
[...]
Rainer
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Subject: [Bug middle-end/83675] [8 regression] Many SPARC tests FAIL with unrecognizable insn
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83675
Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.0
>From gcc-bugs-return-587356-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 22:18:08 2018
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Subject: [Bug c/83676] New: Problems with sscanf parsing hex-floats
Date: Wed, 03 Jan 2018 22:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83676
Bug ID: 83676
Summary: Problems with sscanf parsing hex-floats
Product: gcc
Version: 7.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: BM-2cUWXLL9JqDWpsk8EivFHCgbsbXFtsxQrk at bitmessage dot ch
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Created attachment 43023
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43023&action=edit
example code, visualizing the behavior from above
Assume `d` as a normal double variable.
Executing
`sscanf ( "0x", "%lf", &d )`
returns `0` and `d` isn't modified, 'cause the string can't be parsed.
I think that 0x indicates in correspondence with `%lf`, that there seem to be a
maybe slightly incomplete hex-float.
But wouldn't it be a better behavior if this statement is correctly parsed into
the double `d` with the value `0`, 'cause ignoring the `x` and correctly
parsing `0` as well as assuming that `0x` originally means `0x0` is a much more
thought-out behavior than just saying "sry, but this can't be parsed, so it's
better doing nothing"?
Even though `sscanf ( "0x", "%i", &i )` returns successfully `1` and the
integer value `i` is going to have the value `0`. Furthermore e.g. BSD'
versions of GCC correctly parses the 0x-lf case...
I'm using a x86_64-pc-linux-gnu 4.14.9-Linux to compile the code without any
significant options (no compiler warnings present).
Thanks!
>From gcc-bugs-return-587357-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 22:32:32 2018
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Subject: [Bug middle-end/83675] [8 regression] Many SPARC tests FAIL with unrecognizable insn
Date: Wed, 03 Jan 2018 22:32:00 -0000
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rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-01-03
Assignee|unassigned at gcc dot gnu.org |rsandifo at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Created attachment 43024
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43024&action=edit
Candidate patch
Sorry, I'd missed that this feature was restricted to TARGET_VIS2.
The attached patch seems to fix it.
>From gcc-bugs-return-587358-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 22:46:40 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/83671] Fix for false positive reported by -Wstringop-overflow does not work with inlining
Date: Wed, 03 Jan 2018 22:46:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-03
CC| |msebor at gcc dot gnu.org
Component|c |tree-optimization
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
The reason for the warning is that the solution implemented for bug 83373 is
not effective at -O1 because the strlen pass (where it's been added) doesn't
run at that optimization level. Warnings like -Warray-bounds and
-Wstringop-overflow rely on optimization, especially constant and range
propagation. The latter doesn't run at -O1 either. The better the optimizer
the higher the ratio of true positives to false negatives and false positives.
The warning in this case is also independent of inlining and can be reproduced
with the following simple test case:
char dst[20];
char src[10];
void my_strcpy (void)
{
size_t len = strlen (src);
if (len < sizeof src)
memcpy (dst, src, len + 1);
else
{
memcpy (dst, src, sizeof dst - 1);
dst[sizeof dst - 1] = '\0';
}
}
The IL the -Wstringop-overflow warning works with can be seen in the dump of
the -fdump-tree-optimized option (below). At -O1, the second memcpy call
unconditionally accesses 19 bytes from the src array which triggers the
warning. Because the strlen pass doesn't run, the warning has no way of
telling that the strlen(src) call cannot return a value greater than 19.
In this specific case it's possible to avoid the warning by moving the
strlen(array) optimization to run even at -O1 which seems like a good idea
regardless of the warning, so I'll confirm this bug on that basis. There will
still be other cases where the full strlen pass is required and where these
kinds of issues will not be avoidable.
func2 ()
{
size_t len;
long unsigned int _4;
<bb 2> [local count: 1073741825]:
len_3 = strlen (&src);
if (len_3 <= 19)
goto <bb 3>; [50.00%]
else
goto <bb 4>; [50.00%]
<bb 3> [local count: 536870912]:
_4 = len_3 + 1;
memcpy (&dest, &src, _4);
goto <bb 5>; [100.00%]
<bb 4> [local count: 536870912]:
memcpy (&dest, &src, 19);
MEM[(char *)&dest + 19B] = 0;
<bb 5> [local count: 1073741825]:
return;
}
>From gcc-bugs-return-587361-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 22:53:51 2018
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Subject: [Bug tree-optimization/83603] [8 Regression] ICE in builtin_memref at gcc/gimple-ssa-warn-restrict.c:238
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #8 from Martin Sebor <msebor at gcc dot gnu.org> ---
Fixed in r256217.
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Subject: [Bug c++/83627] -Wdelete-non-virtual-dtor doesn't trigger when calling destructor by hand
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-01-03
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
We copied the warning from Clang, so it's unfortunate that they named it wrong,
but I agree that it makes sense to warn here.
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Subject: [Bug tree-optimization/83603] [8 Regression] ICE in builtin_memref at gcc/gimple-ssa-warn-restrict.c:238
Date: Wed, 03 Jan 2018 22:53:00 -0000
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--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Wed Jan 3 22:52:53 2018
New Revision: 256217
URL: https://gcc.gnu.org/viewcvs?rev=256217&root=gcc&view=rev
Log:
PR tree-optimization/83603 - ICE in builtin_memref at
gcc/gimple-ssa-warn-restrict.c:238
gcc/ChangeLog:
PR tree-optimization/83603
* calls.c (maybe_warn_nonstring_arg): Avoid accessing function
arguments past the endof the argument list in functions declared
without a prototype.
* gimple-ssa-warn-restrict.c (wrestrict_dom_walker::check_call):
Avoid checking when arguments are null.
gcc/testsuite/ChangeLog:
PR tree-optimization/83603
* gcc.dg/Wrestrict-4.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/Wrestrict-4.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/calls.c
trunk/gcc/gimple-ssa-warn-restrict.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c/83676] Problems with sscanf parsing hex-floats
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC does not provide the sscanf here, glibc does. Please report it to them:
http://sourceware.org/bugzilla/ if you think this is a bug.
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Subject: [Bug libstdc++/83626] std::experimental::filesystem::remove_all throws exception instead of returning 0 if path doesn't exist
Date: Wed, 03 Jan 2018 23:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83626
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-01-03
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
There are fixes needed in both remove and remove_all.
>From gcc-bugs-return-587364-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 23:02:29 2018
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Subject: [Bug tree-optimization/81611] [8 Regression] gcc un-learned loop / post-increment optimization
Date: Wed, 03 Jan 2018 23:02:00 -0000
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--- Comment #17 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Created attachment 43025
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43025&action=edit
another complement to the initial partial patch, this one improving
auto-inc-dec
We already had code to turn the following into a post_inc:
(set (reg A) (plus (reg B) (const_int I)))
... (mem (plus (reg A) (const_int -I))) ...
so I've adjusted auto-inc-dec to also look for a (mem (reg B)) and deal with it
in the same way. It worked beautifully for this one testcase. Let's see how a
full bootstrap goes, on machines with auto-inc addressing modes...
>From gcc-bugs-return-587365-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 23:04:47 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++/83624] Strong using deprecation warning in C++03
Date: Wed, 03 Jan 2018 23:04:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to andysem from comment #0)
> The problem with this warning is that it suggests using inline namespaces
> instead, but that is not an option on C++03 code base. The attribute is used
> precisely to emulate C++11 inline namespaces in C++03 mode.
But GCC supports inline namespaces even in C++03 mode (without
-Wpedantic-errors).
If you can use a non-standard GNU-specific attribute in your C++03 code, then
you should be able to use non-standard inline namespaces in C++03 instead.
i.e. the attribute is deprecated and support for it may eventually be removed,
because you can just use inline namespaces instead. Support for them won't be
removed.
>From gcc-bugs-return-587366-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 23:07:06 2018
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Subject: [Bug c++/83672] Unable to take the address of a template function parameter pack specialization with a function argument
Date: Wed, 03 Jan 2018 23:07:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This looks familiar, I think it's a dup of an existing bug report.
>From gcc-bugs-return-587367-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 23:13:05 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/83586] [8 regression] Invalid reported line with -Wformat-truncation on stdio2.h
Date: Wed, 03 Jan 2018 23:13:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Component|c |tree-optimization
Resolution|--- |DUPLICATE
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
The file triggers a bunch of -Wformat-truncation warnings. They don't look
quite the same as the once in comment #0 but the few I looked at appear to be
the symptoms of the same problem as the one I explained in comment #1
(formatting a string from an array into an array of the same size).
The poor inlining context information in the warnings is being tracked in an
existing report: bug 83429. I'll go ahead and resolve this as duplicate of it.
If you think there is an aspect to the warnings that's not covered by either
my explanation or the duplicate bug please reopen this bug and let us know what
it is.
*** This bug has been marked as a duplicate of bug 83429 ***
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Subject: [Bug c++/83429] Incorrect line number reported by -Wformat-truncation
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sylvestre at debian dot org
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
*** Bug 83586 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-587369-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 23:25:42 2018
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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/83677] New: PPC: The xxpermr instruction is not generated correctly
Date: Wed, 03 Jan 2018 23:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83677
Bug ID: 83677
Summary: PPC: The xxpermr instruction is not generated
correctly
Product: gcc
Version: 7.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: wschmidt at gcc dot gnu.org
Target Milestone: ---
Created attachment 43026
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43026&action=edit
Test case demonstrating the problem
Generation of xxpermr for POWER9 results in the high and low ends of the vector
result being swapped. This is due to an incorrect machine description of which
input operand must use the same register as the output operand.
Compiling the attached file with -O2 or -O3 on POWER9 produces a program that
aborts due to wrong code generation.
This eluded discovery until now because xxpermr is rarely generated. We prefer
to generate the more flexible vpermr instruction when possible. We only
generate xxpermr when there's sufficient register pressure that we have to use
the lower VSX registers to represent at least one of the operands. At -O2 or
higher, inlining causes the test case to fail when we reach that pressure
threshold.
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Subject: [Bug target/83677] PPC: The xxpermr instruction is not generated correctly
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |powerpc*-*-*
Status|UNCONFIRMED |NEW
Keywords| |wrong-code
Last reconfirmed| |2018-01-03
CC| |dje at gcc dot gnu.org,
| |segher at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |wschmidt at gcc dot gnu.org
Ever confirmed|0 |1
Target Milestone|--- |7.3
Known to fail| |7.2.1, 8.0
--- Comment #1 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug target/82915] Please mark intrinsics as constexpr
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=70816
Blocks| |55004
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Is this request to make just x86_64 intrinsics constexpr or all of them? (IMO,
all intrinsics that could be should be made constexpr -- see bug 70816 for a
target-independent example; some others may have already been made to work to
help libstdc++).
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004
[Bug 55004] [meta-bug] constexpr issues
>From gcc-bugs-return-587372-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jan 03 23:39:21 2018
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Subject: [Bug target/83466] Wrong TLS GD sequence for ILP32
Date: Wed, 03 Jan 2018 23:39:00 -0000
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--- Comment #4 from Steve Ellcey <sje at gcc dot gnu.org> ---
Created attachment 43027
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43027&action=edit
Patch file being tested
I am testing this patch for regressions, I have verified that it does fix the
small test case.
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Subject: [Bug tree-optimization/83655] [8 Regression] ICE on an invalid call to memcpy declared with no prototype
Date: Wed, 03 Jan 2018 23:42:00 -0000
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--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Wed Jan 3 23:41:32 2018
New Revision: 256218
URL: https://gcc.gnu.org/viewcvs?rev=256218&root=gcc&view=rev
Log:
PR tree-optimization/83655 - ICE on an invalid call to memcpy declared with no
prototype
gcc/testsuite/ChangeLog:
PR tree-optimization/83655
* gcc.dg/Wrestrict-5.c: New test.
* c-c++-common/builtins.c: New test.
gcc/ChangeLog:
PR tree-optimization/83655
* gimple-ssa-warn-restrict.c (wrestrict_dom_walker::check_call): Avoid
checking calls with invalid arguments.
Added:
trunk/gcc/testsuite/c-c++-common/builtins.c
trunk/gcc/testsuite/gcc.dg/Wrestrict-5.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/gimple-ssa-warn-restrict.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug tree-optimization/83655] [8 Regression] ICE on an invalid call to memcpy declared with no prototype
Date: Wed, 03 Jan 2018 23:42:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Fixed in r256218.
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From: "bugzilla@poradnik-webmastera.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/82915] Please mark intrinsics as constexpr
Date: Wed, 03 Jan 2018 23:46:00 -0000
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--- Comment #4 from Daniel Fruzynski <bugzilla@poradnik-webmastera.com> ---
For tracking purposes it probably would be better to have separate issues for
every CPU type which could benefit this. So this one could be for x86, and you
could open other requests for other CPUs which supports SIMD instructions.
>From gcc-bugs-return-587376-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jan 04 00:10:41 2018
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From: "andysem at mail dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/83624] Strong using deprecation warning in C++03
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--- Comment #3 from andysem at mail dot ru ---
As you noted, --pedantic-errors makes that code an error, so it is not an
equivalent replacement.
Also, GNU-specific attributes can and often are supported by other compilers.
When they are not, the attributes are usually ignored. That is not true for
inline namespaces, which would cause a hard error.
What is the rationale of replacing an attribute, which is the traditional way
of extension, with a non-standard (in C++03) syntax?
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Subject: [Bug gcov-profile/83678] New: [GCOV] a pointer assignment before a break statment lead to incorrect coverage in gcov
Date: Thu, 04 Jan 2018 02:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83678
Bug ID: 83678
Summary: [GCOV] a pointer assignment before a break statment
lead to incorrect coverage in gcov
Product: gcc
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# gcc-8 -v
Using built-in specs.
COLLECT_GCC=gcc-8
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
8-20170923-1ubuntu2' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,c++,go,brig,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-8
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 8.0.0 20170923 (experimental) [trunk revision 253118] (Ubuntu
8-20170923-1ubuntu2)
# gcov-8 -v
gcov (Ubuntu 8-20170923-1ubuntu2) 8.0.0 20170923 (experimental) [trunk revision
253118]
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.
# cat small.c
int main()
{
while (1) {
int l = 1;
int *p = &l;
if (0) {
break;
} else {
if (1) {
break;
}
}
}
return 0;
}
# gcc-8 small.c -fprofile-arcs -ftest-coverage; ./a.out gcov-8 small.c; cat
small.c.gcov
File 'small.c'
Lines executed:100.00% of 6
Creating 'small.c.gcov'
-: 0:Source:small.c
-: 0:Graph:small.gcno
-: 0:Data:small.gcda
-: 0:Runs:1
-: 0:Programs:1
1: 1:int main()
-: 2:{
-: 3: while (1) {
1: 4: int l = 1;
1: 5: int *p = &l;
-: 6: if (0) {
1: 7: break;
-: 8: } else {
-: 9: if (1) {
1: 10: break;
-: 11: }
-: 12: }
-: 13: }
1: 14: return 0;
-: 15:}
Line #7 is wrongly marked as executed. However, I am not sure whether this
issue is a duplication of Bug 83505. Therefore, I report it as an new one.
When replacing Line #7 with the 'return', 'continue', or 'goto' statement, the
result is correct.
or
When removing Line #5 is removed, the result is correct.
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From: Abigail Carter <abigail8qkmncarter@gmail.com>
To: gcc-bugs@gcc.gnu.org
Subject: burculi.com
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Hi there!
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<br/>
Regards<br/>
Abigail Carter
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