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* [Bug libgomp/92081] FAIL: libgomp.fortran/target-simd.f90 execution test
[not found] <bug-92081-4@http.gcc.gnu.org/bugzilla/>
@ 2019-10-14 8:49 ` jakub at gcc dot gnu.org
0 siblings, 0 replies; only message in thread
From: jakub at gcc dot gnu.org @ 2019-10-14 8:49 UTC (permalink / raw)
To: gcc-bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92081
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Oct 14 08:48:42 2019
New Revision: 276956
URL: https://gcc.gnu.org/viewcvs?rev=276956&root=gcc&view=rev
Log:
PR libgomp/92081
* testsuite/libgomp.fortran/target-simd.f90: Iterate from 1 rather
than 0.
Modified:
trunk/libgomp/ChangeLog
trunk/libgomp/testsuite/libgomp.fortran/target-simd.f90
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Subject: [Bug libgomp/92081] FAIL: libgomp.fortran/target-simd.f90 execution test
Date: Mon, 14 Oct 2019 08:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92081
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Is it better now?
>From gcc-bugs-return-656316-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 08:56:23 2019
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Subject: [Bug c++/92068] [8/9/10 Regression] ICE on invalid in process_partial_specialization
Date: Mon, 14 Oct 2019 08:56:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.4
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Subject: [Bug tree-optimization/92069] [10 Regression] ice in vect_analyze_scalar_cycles_1, at tree-vect-loop.c:560
Date: Mon, 14 Oct 2019 08:56:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.
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Subject: [Bug ipa/92074] [10 regression] 26% performance regression on Spec2017 548.exchange2_r
Date: Mon, 14 Oct 2019 08:57:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |26163
Target Milestone|--- |10.0
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)
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Subject: [Bug ipa/92077] Multiple independent functions degrades optimizations
Date: Mon, 14 Oct 2019 09:01:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yeah, not sure what we can do about this - it seems that comdat fns are subject
to inline-called-once heuristics but should they really? I think not.
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Subject: [Bug middle-end/92080] Missed CSE of _mm512_set1_epi8(c) with _mm256_set1_epi8(c)
Date: Mon, 14 Oct 2019 09:12:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Interestingly enough with just -mavx512f we get
vmovd %edi, %xmm0
vpbroadcastb %xmm0, %ymm0
vinserti64x4 $0x1, %ymm0, %zmm0, %zmm1
vmovdqa %ymm0, sinky(%rip)
vmovdqa64 %zmm1, sinkz(%rip)
the GIMPLE we expand from is
_7 = {c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D),
c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D),
c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D),
c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D),
c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D),
c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D),
c_1(D), c_1(D), c_1(D), c_1(D), c_1(D)};
_8 = VIEW_CONVERT_EXPR<__m512i>(_7);
sinkz = _8;
_3 = {c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D),
c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D),
c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D), c_1(D),
c_1(D), c_1(D), c_1(D)};
_6 = VIEW_CONVERT_EXPR<__m256i>(_3);
sinky = _6;
where we could replace _6 with a BIT_FIELD_REF but it will be a quite
costly thing to do in general. Our representation for the splats isn't
too nice either...
So without avx512bw we seem miss the splat on V64QI and do a V32QI splat
plus a concat. On the RTL side optimizing this isn't any less awkward
than on GIMPLE I guess.
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Subject: [Bug target/91035] [10 Regression] gotools fails to build on s390x-linux-gnu
Date: Mon, 14 Oct 2019 09:18:00 -0000
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--- Comment #9 from Andreas Krebbel <krebbel at gcc dot gnu.org> ---
I've just posted two patches to fix the remaining GO build problems on S/390.
Ian could you please pick those up to make GO build again on S/390?
Sync hardware facility names with other files in os_linux_s390x.go
https://gcc.gnu.org/ml/gcc-patches/2019-10/msg00963.html
GO S/390: Add kdsaQuery function
https://gcc.gnu.org/ml/gcc-patches/2019-10/msg00964.html
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Subject: [Bug middle-end/92080] Missed CSE of _mm512_set1_epi8(c) with _mm256_set1_epi8(c)
Date: Mon, 14 Oct 2019 09:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92080
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Yeah, it isn't e.g. something RTL CSE would naturally do, because there is no
common subexpression, this needs to know that a narrower broadcast is a part of
a wider broadcast of the same argument and know how to replace that with a
backend instruction that takes the low bits from it (while it actually usually
expands to no code, at least before RA it needs to be expressed some way and is
very backend specific, we don't allow a vector mode to vector mode subreg with
different size). So the only place to deal with this in RTL would be some
backend specific pass I'm afraid.
>From gcc-bugs-return-656323-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 09:36:36 2019
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Subject: [Bug middle-end/92080] Missed CSE of _mm512_set1_epi8(c) with _mm256_set1_epi8(c)
Date: Mon, 14 Oct 2019 09:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92080
--- Comment #3 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 14 Oct 2019, jakub at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92080
>
> Jakub Jelinek <jakub at gcc dot gnu.org> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> CC| |jakub at gcc dot gnu.org
>
> --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> Yeah, it isn't e.g. something RTL CSE would naturally do, because there is no
> common subexpression, this needs to know that a narrower broadcast is a part of
> a wider broadcast of the same argument and know how to replace that with a
> backend instruction that takes the low bits from it (while it actually usually
> expands to no code, at least before RA it needs to be expressed some way and is
> very backend specific, we don't allow a vector mode to vector mode subreg with
> different size). So the only place to deal with this in RTL would be some
> backend specific pass I'm afraid.
So what RTL CSE would need to do is when seeing
(set reg:VNQI ...)
know (via a target hook?) which subregs can be accessed at zero-cost
and register the apropriate smaller vector sets with a subreg value.
That probably makes sense only after reload to not constrain RA
too much. It could be restricted to vec_duplicate since there
it's easy to derive the lowpart expression to register.
>From gcc-bugs-return-656324-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 09:39:20 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/92080] Missed CSE of _mm512_set1_epi8(c) with _mm256_set1_epi8(c)
Date: Mon, 14 Oct 2019 09:39:00 -0000
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--- Comment #4 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 14 Oct 2019, rguenther at suse dot de wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92080
>
> --- Comment #3 from rguenther at suse dot de <rguenther at suse dot de> ---
> On Mon, 14 Oct 2019, jakub at gcc dot gnu.org wrote:
>
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92080
> >
> > Jakub Jelinek <jakub at gcc dot gnu.org> changed:
> >
> > What |Removed |Added
> > ----------------------------------------------------------------------------
> > CC| |jakub at gcc dot gnu.org
> >
> > --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> > Yeah, it isn't e.g. something RTL CSE would naturally do, because there is no
> > common subexpression, this needs to know that a narrower broadcast is a part of
> > a wider broadcast of the same argument and know how to replace that with a
> > backend instruction that takes the low bits from it (while it actually usually
> > expands to no code, at least before RA it needs to be expressed some way and is
> > very backend specific, we don't allow a vector mode to vector mode subreg with
> > different size). So the only place to deal with this in RTL would be some
> > backend specific pass I'm afraid.
>
> So what RTL CSE would need to do is when seeing
>
> (set reg:VNQI ...)
>
> know (via a target hook?) which subregs can be accessed at zero-cost
> and register the apropriate smaller vector sets with a subreg value.
> That probably makes sense only after reload to not constrain RA
> too much. It could be restricted to vec_duplicate since there
> it's easy to derive the lowpart expression to register.
Or IRA/LRA rematerialization / inheritance could be teached to do this.
>From gcc-bugs-return-656325-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 10:41:17 2019
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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/92085] New: [10 Regression] ICE: tree check: expected class 'type', have 'exceptional' (error_mark) in useless_type_conversion_p, at gimple-expr.c:86
Date: Mon, 14 Oct 2019 10:41:00 -0000
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Bug ID: 92085
Summary: [10 Regression] ICE: tree check: expected class
'type', have 'exceptional' (error_mark) in
useless_type_conversion_p, at gimple-expr.c:86
Product: gcc
Version: 10.0
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Target Milestone: ---
gcc-10.0.0-alpha20191013 snapshot (r276943) ICEs when compiling the following
testcase w/ -O1 -fexceptions -fnon-call-exceptions -ftree-loop-vectorize
-fno-tree-sink --param dse-max-alias-queries-per-store=2 for 64-bit targets:
void
di (int y9, int qw)
{
if ((int) &y9 != 0)
{
int py;
int **fq = &py;
while (qw < 1)
{
if ((0 < (**fq ? **fq : (**fq = 1))) / (**fq = y9))
;
++qw;
}
}
}
% gcc-10.0.0-alpha20191013 -O1 -fexceptions -fnon-call-exceptions
-ftree-loop-vectorize -fno-tree-sink --param dse-max-alias-queries-per-store=2
-w -c i1ojhzpc.c
during GIMPLE pass: ifcvt
i1ojhzpc.c: In function 'di':
i1ojhzpc.c:2:1: internal compiler error: tree check: expected class 'type',
have 'exceptional' (error_mark) in useless_type_conversion_p, at
gimple-expr.c:86
2 | di (int y9, int qw)
| ^~
0x6bf41d tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree.c:9974
0x60d471 tree_class_check(tree_node*, tree_code_class, char const*, int, char
const*)
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree.h:3390
0x60d471 useless_type_conversion_p(tree_node*, tree_node*)
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/gimple-expr.c:86
0xcb03fe verify_gimple_assign_ternary
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-cfg.c:4176
0xcb03fe verify_gimple_assign
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-cfg.c:4618
0xcb03fe verify_gimple_stmt
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-cfg.c:4877
0xcb75f6 verify_gimple_in_cfg(function*, bool)
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-cfg.c:5363
0xba9f59 execute_function_todo
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/passes.c:1983
0xbaada0 do_per_function
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/passes.c:1638
0xbaada0 execute_todo
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/passes.c:2037
>From gcc-bugs-return-656326-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 10:48:06 2019
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Subject: [Bug tree-optimization/88760] GCC unrolling is suboptimal
Date: Mon, 14 Oct 2019 10:48:00 -0000
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--- Comment #40 from rguenther at suse dot de <rguenther at suse dot de> ---
On Sat, 12 Oct 2019, guojiufu at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88760
>
> --- Comment #39 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> ---
> For small loop (1-2 stmts), in forms of GIMPLE and RTL, it would be around 5-10
> instructions: 2-4 insns per stmt, ~4 insns for idx.
>
> With current unroller, here is a statistic on spec2017.
> Using --param max-unrolled-insns=12, there are ~3000 small loops could be
> unrolled totally, and ~40 of these small loops are located in hot-functions.
>
> Using --param max-unrolled-insns=16, there are ~11000 small loops could be
> unrolled totally, and ~230 of these small loops are located in hot-functions.
>
> Using --param max-unrolled-insns=20, there are ~15000 small loops could be
> unrolled totally, and ~570 of these small loops are located in hot-functions.
>
> Using --param max-unrolled-insns=24, there are ~18000 small loops could be
> unrolled totally, and ~680 of these small loops are located in hot-functions.
>
>
> if max-unrolled-insns<16, just few small loops are unrolled for hot-functions;
> it may be not very valuable.
So 12 if two times unrolled is already 6 insns, minus IV update and
compare-and-branch (assuming single pattern) that's 4 insns. On
GIMPLE I'd already call this large since eventual memory loads and
stores would be separate - so there it wuld be ~16 instead of 12.
I think the better approach is to identify the cases where unrolling
would help, and on which (sub-)architectures, and prepare testcases
for them.
I guess the times where our default unroll factor (if it fits the
size limits) of 8 is a good idea is long gone, I'd expect ILP
to stop improving much earlier (depending on the set of operations).
For ILP you also want to do interleaving of the unrolled iterations,
so I point to SMS again here (SMS suffers from the fact that
loop dependence info is weak on RTL, but it uses the scheduler
model of the target).
>From gcc-bugs-return-656327-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 11:17:41 2019
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Subject: [Bug web/89964] Remove the "First, you must pick a product on which to enter a bug:" page
Date: Mon, 14 Oct 2019 11:17:00 -0000
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Thanks!
>From gcc-bugs-return-656328-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 11:18:20 2019
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/92057] variant converting constructor fails for primitives
Date: Mon, 14 Oct 2019 11:18:00 -0000
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Because the Double(int) constructor takes an int, and so passing it an int is
not a narrowing conversion.
Try defining that constructor differently and you'll get a warning about a
narrowing conversion inside the constructor:
prog.cc: In constructor 'Double::Double(int)':
prog.cc:7:23: warning: narrowing conversion of 'i' from 'int' to 'double'
[-Wnarrowing]
7 | Double(int i) : x{i} {}
| ^
>From gcc-bugs-return-656329-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 11:24:43 2019
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Subject: [Bug tree-optimization/92085] [10 Regression] ICE: tree check: expected class 'type', have 'exceptional' (error_mark) in useless_type_conversion_p, at gimple-expr.c:86
Date: Mon, 14 Oct 2019 11:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92085
--- Comment #1 from Arseny Solokha <asolokha at gmx dot com> ---
A variant of the same issue:
int a8;
void
c1 (int oz, int dk, int ub)
{
int *hd = 0;
long int *th = &dk;
while (ub < 1)
{
oz || dk;
++ub;
}
while (oz < 2)
{
long int *lq = &oz;
(*hd < (*lq = *th)) < oz;
if (oz == 0)
*th = a8 = oz;
*lq = 0;
}
}
% x86_64-pc-linux-gnu-gcc-10.0.0-alpha20191013 -O1 -ftree-loop-vectorize
-fno-tree-dce -fno-tree-sink -w -c npqss3pc.c
npqss3pc.c: In function 'c1':
npqss3pc.c:4:1: error: statement uses released SSA name
4 | c1 (int oz, int dk, int ub)
| ^~
_6 = _4 < _5;
The use of _4 should have been replaced
during GIMPLE pass: ifcvt
npqss3pc.c:4:1: internal compiler error: cannot update SSA form
0xcf6fe1 update_ssa(unsigned int)
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-into-ssa.c:3325
0xcd757a version_loop_for_if_conversion
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-if-conv.c:2765
0xcdcd5f tree_if_conversion(loop*, vec<gimple*, va_heap, vl_ptr>*)
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-if-conv.c:3051
0xcde9c4 execute
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-if-conv.c:3170
0xcde9c4 execute
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191013/work/gcc-10-20191013/gcc/tree-if-conv.c:3157
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Subject: [Bug tree-optimization/92069] [10 Regression] ice in vect_analyze_scalar_cycles_1, at tree-vect-loop.c:560
Date: Mon, 14 Oct 2019 11:47:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-656331-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 11:47:51 2019
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Subject: [Bug tree-optimization/92069] [10 Regression] ice in vect_analyze_scalar_cycles_1, at tree-vect-loop.c:560
Date: Mon, 14 Oct 2019 11:47:00 -0000
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--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Oct 14 11:47:15 2019
New Revision: 276959
URL: https://gcc.gnu.org/viewcvs?rev=276959&root=gcc&view=rev
Log:
2019-10-14 Richard Biener <rguenther@suse.de>
PR tree-optimization/92069
* tree-vect-loop.c (vect_analyze_scalar_cycles_1): For nested
cycles do not set vect_nested_cycle on the latch definition.
* gcc.dg/torture/pr92069.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr92069.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vect-loop.c
>From gcc-bugs-return-656332-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 12:01:01 2019
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Subject: [Bug c/92086] New: Provide way to avoid saving callee-saved registers in functions without callers
Date: Mon, 14 Oct 2019 12:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92086
Bug ID: 92086
Summary: Provide way to avoid saving callee-saved registers in
functions without callers
Product: gcc
Version: 10.0
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In some cases, it is desirable as an optimization not to save any callee-saved
registers in the function prologue. This is common for functions which are at
the lowest frame, where there is nothing to return to, and unwinding cannot
proceed, either. However, GCC seems to generate code for saving registers even
for such functions, for example:
int f1 (int);
__attribute__ ((noreturn, nothrow))
void
f2 (void)
{
int x1 = f1 (1);
int x2 = f1 (2);
int x3 = f1 (3);
int x4 = f1 (4);
f1 (x1);
f1 (x2);
f1 (x3);
f1 (x4);
__builtin_unreachable ();
}
yields this on x86-64 (with GCC 9):
f2:
pushq %r14
movl $1, %edi
pushq %r13
pushq %r12
pushq %rbp
subq $8, %rsp
call f1@PLT
movl $2, %edi
movl %eax, %r14d
call f1@PLT
movl $3, %edi
movl %eax, %r13d
call f1@PLT
movl $4, %edi
movl %eax, %r12d
call f1@PLT
movl %r14d, %edi
movl %eax, %ebp
call f1@PLT
movl %r13d, %edi
call f1@PLT
movl %r12d, %edi
call f1@PLT
movl %ebp, %edi
call f1@PLT
If it is not possible to unwind into the caller of f2 (say because it does not
exist), there is no impact on debugging experience because the saved values are
useless even for debugging.
I've reported this bug against the C front end because we may need a new
attribute for this. (If noreturn+nothrown cannot be repurposed.)
Mailing list discussion: https://gcc.gnu.org/ml/gcc-help/2019-10/msg00052.html
>From gcc-bugs-return-656333-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 12:02:46 2019
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Subject: [Bug debug/91929] missing inline subroutine information in build using sin/cos
Date: Mon, 14 Oct 2019 12:02:00 -0000
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--- Comment #7 from Milian Wolff <mail at milianw dot de> ---
to me, that backtrace looks quite nice and usable - a huge improvement, thanks!
what you are saying is that if the same file would be calling sin/cos somewhere
else, only one of those inline locations would show up? too bad, but I can see
how it's impossible to map this in an efficient way...
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Subject: [Bug c/92086] Provide way to avoid saving callee-saved registers in functions without callers
Date: Mon, 14 Oct 2019 12:06:00 -0000
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I dont see this helping code in real life programs. Can you explain where you
think this could be used?
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Subject: [Bug fortran/92087] New: Do front-end optimization and warnings using basic blocks and value or propagation
Date: Mon, 14 Oct 2019 12:14:00 -0000
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Bug ID: 92087
Summary: Do front-end optimization and warnings using basic
blocks and value or propagation
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Doing some optimization work in the front end using
value propagation could be a win.
For example, an error could be issued for
allocate (a(100))
do i=0,100
a(i) =...
or we could make sure never to warn for
real :: a(6)
do i=1,5
if (i < 6) a(i) = 42.
if we had range propagation.
This could also help with
subroutine foo (a,n)
real :: a(n)
...
do i=,n
a(n+1) = a(n) + 1.
end do
which we currently do not warn about because it would
be legal if the user changed n before reaching the DO
loop.
Regarding optimization, we should not try to do what the
middle-end already does, so the focus should be on
Fortran-specific constructs, especially array handling.
>From gcc-bugs-return-656336-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 12:18:19 2019
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92087
Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |koenigni at gcc dot gnu.org
Blocks| |36854
Severity|normal |enhancement
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36854
[Bug 36854] [meta-bug] fortran front-end optimization
>From gcc-bugs-return-656337-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 12:22:37 2019
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Subject: [Bug c/92086] Provide way to avoid saving callee-saved registers in functions without callers
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Does it need a new attribute at all?
If not, an optimisation like this is obviously beneficial: it saves code
space, after all. (Well, assuming it doesn't hurt the debug experience).
>From gcc-bugs-return-656338-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 12:32:00 2019
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/91929] missing inline subroutine information in build using sin/cos
Date: Mon, 14 Oct 2019 12:31:00 -0000
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--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Milian Wolff from comment #7)
> to me, that backtrace looks quite nice and usable - a huge improvement,
> thanks!
>
> what you are saying is that if the same file would be calling sin/cos
> somewhere else, only one of those inline locations would show up? too bad,
> but I can see how it's impossible to map this in an efficient way...
Yeah, so consider
double A (double x) { return sin(x); }
double B (double x) { return sin(x); }
double foo(double x, int which)
{
double res;
if (which == 1)
res = A (x);
else
res = B (x);
}
when GCC inlines both functions and performs code hoisting to get the
following optimized function then the call to sin will always appear
to come from either A or B (and that quite randomly).
double foo(double x)
{
return sin(x);
}
This exact situation of course shouldn't happen very often but with C++
and some more contrieved examples you may run into a situation that can
be mapped to this. And I'm not sure that the original behavior which
for this particular case would simply say sin() was called from foo()
wouldn't be better than the patched behavior which says the call
was always from A.
>From gcc-bugs-return-656339-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 12:42:00 2019
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Subject: [Bug c/92086] Provide way to avoid saving callee-saved registers in functions without callers
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--- Comment #3 from Florian Weimer <fw at gcc dot gnu.org> ---
It also saves stack space.
I'm not sure if it is prudent to repurpose noreturn+nothrow for this. There
might be existing such functions where people expect to see a full call stack.
Something more explicit seems better.
>From gcc-bugs-return-656340-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 12:46:54 2019
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Subject: [Bug c/92086] Provide way to avoid saving callee-saved registers in functions without callers
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--- Comment #4 from Florian Weimer <fw at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> I dont see this helping code in real life programs. Can you explain where
> you think this could be used?
The thread start routine wrapper in glibc. On x86-64, we could save two words
on every thread's stack.
For the main thread, we currently use an assembler helper to get a similar
effect (although the helper performs additional stack adjustment, too).
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From: "mail at milianw dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/91929] missing inline subroutine information in build using sin/cos
Date: Mon, 14 Oct 2019 13:01:00 -0000
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--- Comment #9 from Milian Wolff <mail at milianw dot de> ---
> And I'm not sure that the original behavior which for
> this particular case would simply say sin() was called from foo()
This would indeed be the best, but that didn't happen originally when `foo`
itself got inlined like in my example. See again the original backtrace from
GDB:
```
Breakpoint 2, 0x0000000000418790 in __cos_fma ()
(gdb) bt
#0 0x0000000000418790 in __cos_fma ()
#1 0x0000000000401573 in
std::generate_n<std::back_insert_iterator<std::vector<double> >, int,
main()::<lambda()> > (__n=100000, __gen=...,
__first=...) at /usr/include/c++/9.1.0/new:174
#2 main () at ../../../manual/clients/vector.cpp:16
```
This is very confusing to the end user, and personally I think it would be
better to have at least one wrong branch here rather than none at all.
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Subject: [Bug target/92075] extracting element from NEON float-vector moves to/from integer register
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Wilco <wilco at gcc dot gnu.org> changed:
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--- Comment #1 from Wilco <wilco at gcc dot gnu.org> ---
Confirmed. AArch64 gets this right so we should emit efficient code on Arm too.
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Subject: [Bug target/91189] 20% binary size regression in avr-gcc 9.1.0 from 8.3.0
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Georg-Johann Lay <gjl at gcc dot gnu.org> changed:
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--- Comment #4 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
(In reply to Nicola Fontana from comment #3)
> This is still an issue with gcc-9.2.0.
We still have no test case.
>From gcc-bugs-return-656344-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 14:04:12 2019
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Subject: [Bug middle-end/92046] Command line options (that are per-functions) are affecting --params which are global.
Date: Mon, 14 Oct 2019 14:04:00 -0000
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--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Oct 14 14:03:35 2019
New Revision: 276963
URL: https://gcc.gnu.org/viewcvs?rev=276963&root=gcc&view=rev
Log:
2019-10-14 Richard Biener <rguenther@suse.de>
PR middle-end/92046
* dse.c (scan_insn): Use param max_active_local_stores.
(dse_step1): Get PARAM_MAX_DSE_ACTIVE_LOCAL_STORES and adjust
based on optimization level.
* loop-invariant.c (move_loop_invariants): Adjust
LOOP_INVARIANT_MAX_BBS_IN_LOOP based on optimization level.
* opts.c (default_options_optimization): Do not adjust
PARAM_MAX_DSE_ACTIVE_LOCAL_STORES and
LOOP_INVARIANT_MAX_BBS_IN_LOOP here.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dse.c
trunk/gcc/loop-invariant.c
trunk/gcc/opts.c
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Subject: [Bug middle-end/92088] New: aggregates with VLAs and nested functions are broken
Date: Mon, 14 Oct 2019 14:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92088
Bug ID: 92088
Summary: aggregates with VLAs and nested functions are broken
Product: gcc
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Tried to see where we might miscompile things due to the inliner remapping
types...
void foo(int n)
{
struct X { int a[n]; } y;
struct X baz (struct X x)
{
x.a[0] = 1;
return x;
}
y.a[0] = 0;
y = baz(y);
if (y.a[0] != 1)
__builtin_abort ();
}
ICEs left and right. After fixing the most obvious we end up with
t.c: In function ‘foo’:
t.c:1:6: error: size of variable ‘x’ is too large
1 | void foo(int n)
| ^~~
when inlining because the inliner fails to appropriately "allocate" the
parameter space for baz 'x':
foo (int n)
{
struct X x;
struct X * y.1;
sizetype _1;
int _7;
sizetype _8;
<bb 2> [local count: 1073741824]:
__builtin_dwarf_cfa (0);
_1 = (sizetype) n_2(D);
_8 = _1 * 4;
y.1_10 = __builtin_alloca_with_align (_8, 32);
y.1_10->a[0] = 0;
x = [with_size_expr] WITH_SIZE_EXPR <*y.1_10, _8>;
x.a[0] = 1;
__builtin_memcpy (y.1_10, &x, _8);
x ={v} {CLOBBER};
_7 = y.1_10->a[0];
>From gcc-bugs-return-656346-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 14:11:58 2019
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Subject: [Bug c++/88335] Implement P1073R3, C++20 immediate functions (consteval).
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Toni Neubert <lutztonineubert at gmail dot com> changed:
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--- Comment #7 from Toni Neubert <lutztonineubert at gmail dot com> ---
Any progress on this? How can we help?
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Subject: [Bug tree-optimization/92085] [10 Regression] ICE: tree check: expected class 'type', have 'exceptional' (error_mark) in useless_type_conversion_p, at gimple-expr.c:86
Date: Mon, 14 Oct 2019 14:14:00 -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> ---
Started with r276681.
>From gcc-bugs-return-656348-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 14:45:42 2019
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Subject: [Bug tree-optimization/92085] [10 Regression] ICE: tree check: expected class 'type', have 'exceptional' (error_mark) 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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----------------------------------------------------------------------------
CC| |prathamesh3492 at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The COND_EXPR assignment stmt refers to in-free-list SSA_NAME _16.
>From gcc-bugs-return-656349-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 14:57:34 2019
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Subject: [Bug target/92055] [avr] Support 64-bit double
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--- Comment #3 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
Created attachment 47030
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47030&action=edit
double64-4.diff: patch that also supports --with-long-double64
>From gcc-bugs-return-656350-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 14:58:23 2019
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Subject: [Bug ipa/92074] [10 regression] 26% performance regression on Spec2017 548.exchange2_r
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
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--- Comment #1 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
This is a pretty serious regression. Should the patch be reverted until the
problem can be sorted out?
>From gcc-bugs-return-656351-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 15:05:14 2019
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Subject: [Bug other/89327] Joined options without RejectsNegative
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Iain Sandoe <iains at gcc dot gnu.org> changed:
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--- Comment #2 from Iain Sandoe <iains at gcc dot gnu.org> ---
there were a number of Darwin cases (in addition to the ones noted).
I've fixed these on trunk and all open branches.
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Subject: [Bug libstdc++/92057] variant converting constructor fails for primitives
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--- Comment #7 from pj at patrickjohnston dot org ---
Yeah but the `variant<Double>{600}` doesn't fail to compile due to this
narrowing conversion
>From gcc-bugs-return-656353-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 15:33:49 2019
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Subject: [Bug fortran/81827] Large compile time with derived-type rrays
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--- Comment #22 from Luke Robison <robison at arlut dot utexas.edu> ---
(In reply to Luke Robison from comment #21)
> (1) Changing some or all of the "type(levelNN)" definitions to
> "class(levelNN)" definitions
> (2) Changing from "allocatable" to "pointer"
>
Although these work-arounds seem sufficient for this test case, they did not
alleviate the problem in the original program. We are still unable to use
recent gfortran versions on our main codebase due to this error.
Luke
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/88335] Implement P1073R3, C++20 immediate functions (consteval).
Date: Mon, 14 Oct 2019 15:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88335
--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Work has been restarted, we should have this feature fairly soon. Certainly
the plan is to have it in GCC 10.
>From gcc-bugs-return-656355-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 15:42:48 2019
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/88335] Implement P1073R3, C++20 immediate functions (consteval).
Date: Mon, 14 Oct 2019 15:42:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47031
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gcc10-pr88335-wip.patch
As the first step, here is the previous patch updated so that it applies to
current trunk (various changes due to constinit etc.), no further functional
changes so far.
>From gcc-bugs-return-656356-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 15:46:06 2019
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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/92086] Provide way to avoid saving callee-saved registers in functions without callers
Date: Mon, 14 Oct 2019 15:46:00 -0000
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--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
A new attribute is not very enticing. First, it is yet another special-purpose
attribute, which can also be surprisingly hard to define what it should do.
Because it is a special attribute, the feature will be used a lot less than if
functions get this automatically, simply by being no+no. This means that the
feature is much less useful, and will be much less tested. Which is especially
bad because...
A big part of the support for this will be in target-specific code: the *logue
code has to decide not to save and restore those registers.
>From gcc-bugs-return-656357-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 16:09:24 2019
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/92057] variant converting constructor fails for primitives
Date: Mon, 14 Oct 2019 16:09:00 -0000
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--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Because the narrowing conversion happens inside the Double(int) constructor.
The constrain on the variant(T&&) constructor only checks if a Double can be
constructed from an int without narrowing. Which it can.
What happens inside the constructor after that is unrelated. That's how C++
works.
>From gcc-bugs-return-656358-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 16:20:17 2019
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Subject: [Bug target/92083] -mlong-double-64 strange results
Date: Mon, 14 Oct 2019 16:20:00 -0000
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--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Note also that glibc does not support being built with a different long
double ABI from the default one. On architectures where more than one
long double format is supported by glibc, either a format is paired with
other ABI choices (mips, where long double is binary64 for the o32 ABI and
binary128 for the other two ABIs), or more than one long double ABI is
supported in the same glibc build and the headers automatically select
different functions accordingly (alpha, powerpc, s390, 32-bit sparc; in
the powerpc64le case, work is underway to support binary128 as a third
long double format in a single glibc build, but much of that is not yet in
glibc). x86 is not one of those architectures, so alternative long double
formats are not supported for it in glibc at all. (Before NaCl died, I
think Roland planned to add support for different formats for use by the
x86 NaCl port, but that never got merged and all the Arm NaCl support was
removed.)
>From gcc-bugs-return-656359-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 16:30:25 2019
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Subject: [Bug middle-end/92088] aggregates with VLAs and nested functions are broken
Date: Mon, 14 Oct 2019 16:30:00 -0000
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--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
There are various existing bug reports for ICEs involving VLAs and nested
functions (e.g. 59711, 60085, 69193, 70418). I don't know which might be
related to this one (and even if some are already fixed, testcases from
them are probably useful to add to the testsuite).
>From gcc-bugs-return-656360-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 16:45:59 2019
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Subject: [Bug c++/88335] Implement P1073R3, C++20 immediate functions (consteval).
Date: Mon, 14 Oct 2019 16:45:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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is obsolete| |
--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47032
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47032&action=edit
gcc10-pr88335-wip.patch
Small improvements and one bugfix.
>From gcc-bugs-return-656361-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 16:52:58 2019
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Subject: [Bug c++/85806] [concepts] Hard error for "invalid use of non-static data member" in a requires expression
Date: Mon, 14 Oct 2019 16:52:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This now compiles but gives the wrong result:
85806.cc:11:17: error: static assertion failed
11 | static_assert(!HasCount<S>);
| ^~~~~~~~~~~~
>From gcc-bugs-return-656362-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 16:54:29 2019
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Subject: [Bug c++/82380] [concepts] Error when using requires constraint with attributes
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This now compiles using -std=gnu++20 but not using -std=gnu++17 -fconcepts
>From gcc-bugs-return-656363-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 16:56:19 2019
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Subject: [Bug c++/85806] [concepts] Hard error for "invalid use of non-static data member" in a requires expression
Date: Mon, 14 Oct 2019 16:56:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I tested it with "concept" not "concept bool" i.e.
template<typename T>
concept HasCount = requires {
typename ::helper<T::count>;
};
struct S {
int count = 42;
};
static_assert(!HasCount<S>);
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Subject: [Bug c++/82380] [concepts] Error when using requires constraint with attributes
Date: Mon, 14 Oct 2019 16:56:00 -0000
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I tested it with "concept" not "concept bool" i.e.
template <class T>
concept C = true;
template <class T>
requires C<T>
[[nodiscard]] int f(T t) {
return 22;
}
int main() {
return 0;
}
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Subject: [Bug c++/67225] [concepts] Expression constraint with a constrained result turns off access checking
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----------------------------------------------------------------------------
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Subject: [Bug c++/67225] [concepts] Expression constraint with a constrained result turns off access checking
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--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This be closed now that concepts-cxx2a has been merged to trunk.
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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Bug 67491 depends on bug 67225, which changed state.
Bug 67225 Summary: [concepts] Expression constraint with a constrained result turns off access checking
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67225
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Subject: [Bug c++/92089] New: [concepts] requires-expression results in hard error during constraint checking
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Bug ID: 92089
Summary: [concepts] requires-expression results in hard error
during constraint checking
Product: gcc
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template<typename T>
concept anything = true;
template<typename> struct incrementable_traits { using type = int; };
template<typename T>
requires requires(T a, T b) { { a - b } -> anything; }
struct incrementable_traits<T>
{
};
incrementable_traits<void>::type t;
In file included from
/home/jwakely/gcc/10/include/c++/10.0.0/bits/stl_iterator_base_types.h:71,
from
/home/jwakely/gcc/10/include/c++/10.0.0/bits/stl_algobase.h:65,
from /home/jwakely/gcc/10/include/c++/10.0.0/array:40,
from iterc.cc:13:
/home/jwakely/gcc/10/include/c++/10.0.0/bits/iterator_concepts.h:139:14: error:
invalid use of 'void'
139 | { { a - b } -> integral; })
| ~~^~~
There are two problems here. Firstly, if it's an invalid use of void then the
requires-clause should simply fail to be satisfied, there should not be an
error.
Secondly, there's no context and no clue where the problem comes from. In the
real code I had 300 lines of code and was given no clue which one happened to
instantiate this constraint with type 'void'.
It might be helpful to say something like "during constraint checking for
incrementable_traits<void>" and then "required from ..." as we do for template
instantiations (or would that negate the supposed benefits of concepts for
clearer diagnostics?)
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Subject: [Bug c++/92089] [concepts] requires-expression results in hard error during constraint checking
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----------------------------------------------------------------------------
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Referenced Bugs:
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[Bug 67491] [meta-bug] concepts issues
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Subject: [Bug c++/71125] [concepts] Spurious 'invalid reference to function concept error' issued when overloads are not all declared with the concept specifier
Date: Mon, 14 Oct 2019 17:07:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Is this valid in C++20?
I think G++ is correct to reject it due to redeclaring C1, C2 etc. as a
different kind of symbol.
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Subject: [Bug c++/71136] [concepts] Spurious 'converting overloaded function is ambiguous' error.
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-10-14
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This still fails on trunk when updated for C++2a syntax, using -std=gnu++2a:
template<typename, typename>
struct is_same {};
template<typename T>
struct is_same<T, T> { using type = T; };
// Concept imposes a same-type-as-int constraint.
template<typename T>
concept C = requires { typename is_same<T, int>::type; };
template<typename U>
constexpr int f() { return 0; } // #1, unconstrained overload.
template<C U>
constexpr int f() { return 1; } // #2, constrained overload.
// Obtaining a function pointer to #1 is ok:
constexpr auto x0 = f<char>; // Ok, overload selects #1
static_assert(x0() == 0); // Ok.
// Invoking #2 is ok:
constexpr auto x1 = f<int>(); // Ok, overload selects #2
static_assert(x1 == 1); // Ok.
// Obtaining a function pointer to #2 fails:
constexpr auto x2 = f<int>; // spurious error: 'converting overloaded
// function is ambiguous'; should select #2.
static_assert(x2() == 1);
71136.cc:24:21: error: converting overloaded function 'f' to type 'int (*
const)()' is ambiguous
24 | constexpr auto x2 = f<int>; // spurious error: 'converting
overloaded
| ^~~~~~
71136.cc:11:15: note: candidates are: 'constexpr int f() [with U = int]'
11 | constexpr int f() { return 0; } // #1, unconstrained overload.
| ^
71136.cc:13:15: note: 'constexpr int f() [with U = int]'
13 | constexpr int f() { return 1; } // #2, constrained overload.
| ^
71136.cc:26:20: error: non-constant condition for static assertion
26 | static_assert(x2() == 1);
| ~~~~~^~~~
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Subject: [Bug c++/68372] [concepts] invalid use of pack expansion expression in member function template declaration
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68372
Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Thanks Jeff, please send the patch to the gcc-patches mailing list for review
and to get it committed to subversion.
>From gcc-bugs-return-656372-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:11:16 2019
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Subject: [Bug c++/70862] [concepts] adding a concept-constrained version of a variable template causes multiple definition assembler error
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Thanks Jeff, please send the patch to the gcc-patches mailing list for review
and to get it committed to subversion.
>From gcc-bugs-return-656374-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:13:53 2019
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Subject: [Bug c++/68045] [concepts] segfault in contains_struct_check ../../gcc/gcc/tree.h:2971
Date: Mon, 14 Oct 2019 17:13:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I don't get an ICE with current trunk.
I don't think the crash is actually related to concepts, if the same problem
happened for fortran code.
>From gcc-bugs-return-656375-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:15:40 2019
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Subject: [Bug c++/67148] [concepts] Failed concept check when indirecting through a constrained trait
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This be closed now that concepts-cxx2a has been merged to trunk.
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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Bug 67491 depends on bug 67148, which changed state.
Bug 67148 Summary: [concepts] Failed concept check when indirecting through a constrained trait
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67148
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>From gcc-bugs-return-656377-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:16:44 2019
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Subject: [Bug libstdc++/88338] Implement P0898R3, C++20 concepts library.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88338
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-10-14
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I've already added <concepts> and am finishing the tests for the additions to
<iterator>.
>From gcc-bugs-return-656378-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:28:58 2019
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Subject: [Bug libstdc++/92057] variant converting constructor fails for primitives
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--- Comment #9 from pj at patrickjohnston dot org ---
I'm sorry to belabour this, but I don't see how narrowing conversions even has
anything to do with p0608.
The only modification described by the paper (relevant to this case) is the
requirement that `T_i x[] = {std::forward<T>(t)};` is well formed, which it is,
regardless of whether the conversion is provably lossless (
https://wandbox.org/permlink/ybECPFinbwPMtxJF ).
>From gcc-bugs-return-656379-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:35:25 2019
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Subject: [Bug c++/88515] [concepts] id-expression that names non-static data member rejected in requires-expression
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See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=85806
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This compiles with current trunk.
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Subject: [Bug c++/89913] [7/8/9/10 Regression] [concepts] ICE with invalid using declaration
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Still ICEs on current trunk.
>From gcc-bugs-return-656381-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:37:38 2019
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Subject: [Bug c++/85263] [concepts] ICE with parameter pack matching
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Still ICEs on current trunk.
>From gcc-bugs-return-656383-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:39:53 2019
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Subject: [Bug c++/87536] Illegal recursive concept leads to compiler ICE
Date: Mon, 14 Oct 2019 17:39:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Seems to be fixed on trunk:
87536.cc:2:13: error: 'X' was not declared in this scope
2 | concept X = X<T>;
| ^
87536.cc:2:16: error: expected primary-expression before '>' token
2 | concept X = X<T>;
| ^
87536.cc:2:17: error: expected primary-expression before ';' token
2 | concept X = X<T>;
| ^
87536.cc:5:6: error: template constraint failure for 'template<class> requires
X< <template-parameter-1-1> > struct A'
5 | A<int> a;
| ^
87536.cc:5:6: note: constraints not satisfied
>From gcc-bugs-return-656382-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:39:03 2019
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Subject: [Bug c++/86009] [Concepts] Placeholder as argument to partial-concept-id forms extra constrained parameters
Date: Mon, 14 Oct 2019 17:39:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Trunk now says:
86009.cc:3:11: error: expected 'auto' or 'decltype(auto)' after 'C1'
3 | void f(C0<C1> *) { }
| ^~
86009.cc:3:8: error: expected 'auto' or 'decltype(auto)' after 'C0<auto:1>'
3 | void f(C0<C1> *) { }
| ^~~~~~
86009.cc:5:15: error: template-id 'f<wchar_t, short int>' for 'void
f(wchar_t*)' does not match any template declaration
5 | template void f<wchar_t, short>(wchar_t *);
| ^~~~~~~~~~~~~~~~~
86009.cc:3:6: note: candidate is: 'template<class auto:1, class auto:2>
requires (C1<auto:1>) && (C0<auto:2, auto:1>) void f(auto:2*)'
3 | void f(C0<C1> *) { }
| ^
>From gcc-bugs-return-656384-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:44:42 2019
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Subject: [Bug c++/79982] Compiler crashes when using illegal concepts (nested requirements)
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No crash on current trunk, with an updated example using C++2a syntax:
template <typename T> concept Void = __is_same_as(T, void);
template <typename T>
concept my_concept = requires(T t)
{
requires requires (int val) { { t.serialize(val) } -> Void; };
};
class my_class
{
void serialize(int);
};
static_assert(my_concept<my_class>);
It fails now:
79982.cc:14:15: error: static assertion failed
14 | static_assert(my_concept<my_class>);
| ^~~~~~~~~~~~~~~~~~~~
>From gcc-bugs-return-656386-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:45:52 2019
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Subject: [Bug target/90928] [9/10 Regression] [nvptx] internal compiler error: in instantiate_virtual_regs_in_insn, at function.c:1737
Date: Mon, 14 Oct 2019 17:45:00 -0000
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Thomas Schwinge <tschwinge at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-10-14
CC| |tschwinge at gcc dot gnu.org
Known to work| |9.1.0
Version|10.0 |9.2.0
Summary|[nvptx] internal compiler |[9/10 Regression] [nvptx]
|error: in |internal compiler error: in
|instantiate_virtual_regs_in |instantiate_virtual_regs_in
|_insn, at function.c:1737 |_insn, at function.c:1737
Ever confirmed|0 |1
Known to fail| |10.0, 9.2.0
--- Comment #1 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
This appears on trunk in (r271346, r272643].
Same on gcc-9-branch in (r270842, r274274] (that's between 9.1 and 9.2).
So this could do with some more bi-secting.
>From gcc-bugs-return-656385-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:45:35 2019
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Subject: [Bug c++/80268] [concepts] list of candidates for ambiguous call includes unconstrained function
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No change on current trunk.
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Subject: [Bug libstdc++/92057] variant converting constructor fails for primitives
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Marshall Clow <mclow.lists at gmail dot com> changed:
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--- Comment #10 from Marshall Clow <mclow.lists at gmail dot com> ---
> I'm sorry to belabour this, but I don't see how narrowing conversions even has anything to do with p0608.
Quoting from
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0608r3.html:
> Proposed Resolution:
> This paper proposes to constrain the variant converting constructor and the converting assignment operator to prevent narrowing conversions and conversions to bool.
>From gcc-bugs-return-656388-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 17:54:05 2019
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Subject: [Bug libstdc++/92057] variant converting constructor fails for primitives
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--- Comment #11 from Marshall Clow <mclow.lists at gmail dot com> ---
With wrapping:
> Proposed Resolution:
> This paper proposes to constrain the variant converting constructor and the
> converting assignment operator to prevent narrowing conversions
> and conversions to bool.
>From gcc-bugs-return-656389-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 18:27:10 2019
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From: "seurer at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/92090] New: [10 regression] ICE in gcc.dg/atomic/c11-atomic-exec-5.c starting with r276469
Date: Mon, 14 Oct 2019 18:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92090
Bug ID: 92090
Summary: [10 regression] ICE in
gcc.dg/atomic/c11-atomic-exec-5.c starting with
r276469
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: seurer at gcc dot gnu.org
Target Milestone: ---
Tried 276469
make -k check-gcc RUNTESTFLAGS=atomic.exp=gcc.dg/atomic/c11-atomic-exec-5.c
FAIL: gcc.dg/atomic/c11-atomic-exec-5.c -Os (internal compiler error)
FAIL: gcc.dg/atomic/c11-atomic-exec-5.c -Os (test for excess errors)
Executing on host: /home/seurer/gcc/build/gcc-test2/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test2/gcc/
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/atomic/c11-atomic-exec-5.c
-B/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libatomic/
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libatomic/.libs
-latomic -fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -Os -std=c11 -pedantic-errors -pthread
-U_POSIX_C_SOURCE -D_POSIX_C_SOURCE=200809L -lm -o ./c11-atomic-exec-5.exe
(timeout = 600)
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-test2/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test2/gcc/
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/atomic/c11-atomic-exec-5.c
-B/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libatomic/
-L/home/seurer/gcc/build/gcc-test2/powerpc64-unknown-linux-gnu/./libatomic/.libs
-latomic -fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -Os -std=c11 -pedantic-errors -pthread
-U_POSIX_C_SOURCE -D_POSIX_C_SOURCE=200809L -lm -o ./c11-atomic-exec-5.exe
during RTL pass: reload
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/atomic/c11-atomic-exec-5.c: In
function 'main':
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/atomic/c11-atomic-exec-5.c:549:1:
internal compiler error: in lra_set_insn_recog_data, at lra.c:995
0x108655af lra_set_insn_recog_data(rtx_insn*)
/home/seurer/gcc/gcc-test2/gcc/lra.c:993
0x10869117 lra_get_insn_recog_data
/home/seurer/gcc/gcc-test2/gcc/lra-int.h:488
0x10869117 remove_scratches_1
/home/seurer/gcc/gcc-test2/gcc/lra.c:2053
0x1086921b lra_emit_move(rtx_def*, rtx_def*)
/home/seurer/gcc/gcc-test2/gcc/lra.c:503
0x108861f7 curr_insn_transform
/home/seurer/gcc/gcc-test2/gcc/lra-constraints.c:4397
0x1088845f lra_constraints(bool)
/home/seurer/gcc/gcc-test2/gcc/lra-constraints.c:4994
0x1086992f lra(_IO_FILE*)
/home/seurer/gcc/gcc-test2/gcc/lra.c:2432
0x10804d6b do_reload
/home/seurer/gcc/gcc-test2/gcc/ira.c:5511
0x10804d6b execute
/home/seurer/gcc/gcc-test2/gcc/ira.c:5697
>From gcc-bugs-return-656390-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 18:32:18 2019
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From: "Casey at Carter dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/71125] [concepts] Spurious 'invalid reference to function concept error' issued when overloads are not all declared with the concept specifier
Date: Mon, 14 Oct 2019 18:32:00 -0000
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--- Comment #2 from Casey Carter <Casey at Carter dot net> ---
(In reply to Jonathan Wakely from comment #1)
> Is this valid in C++20?
Definitely not: there are no concept functions in C++20.
>
> I think G++ is correct to reject it due to redeclaring C1, C2 etc. as a
> different kind of symbol.
I agree. Only functions and function templates may be overloaded, and despite
appearances to the contrary a function concept declaration declares a concept,
not a function template. I suggest classifying this as a poor diagnostic for TS
concepts.
>From gcc-bugs-return-656391-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 18:54:27 2019
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Subject: [Bug libstdc++/92057] variant converting constructor fails for primitives
Date: Mon, 14 Oct 2019 18:54:00 -0000
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--- Comment #12 from pj at patrickjohnston dot org ---
Intentions aside, the concrete change given at the bottom of the paper doesn't
seem to reflect the non-narrowing conversion constraint
>From gcc-bugs-return-656392-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 19:07:07 2019
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Subject: [Bug other/92090] [10 regression] ICE in gcc.dg/atomic/c11-atomic-exec-5.c starting with r276469
Date: Mon, 14 Oct 2019 19:07:00 -0000
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--- Comment #1 from seurer at gcc dot gnu.org ---
It also causes these assembler instruction count tests to fail.
> FAIL: gcc.target/powerpc/pr79439-1.c scan-assembler-times \\mbl f\\M 1
> FAIL: gcc.target/powerpc/pr79439-1.c scan-assembler-times \\mbl g\\M 1
> FAIL: gcc.target/powerpc/pr79439-1.c scan-assembler-times \\mnop\\M 2
>From gcc-bugs-return-656393-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 19:31:00 2019
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Subject: [Bug c++/91930] [10 Regression] internal compiler error: in lazily_declare_fn, at cp/method.c:2423 with -fconcepts
Date: Mon, 14 Oct 2019 19:30:00 -0000
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-10-14
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>From gcc-bugs-return-656394-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 19:44:12 2019
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Subject: [Bug c++/30277] bit-field: wrong overload resolution
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #10 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for GCC 10.
>From gcc-bugs-return-656395-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 19:45:50 2019
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Subject: [Bug c++/85254] boost::is_final does not work for template types
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Jason Merrill <jason at gcc dot gnu.org> changed:
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CC| |jason at gcc dot gnu.org
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--- Comment #7 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for GCC 10.
>From gcc-bugs-return-656396-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 19:50:34 2019
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Subject: [Bug c++/88329] Implement C++20 std concepts.
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Jason Merrill <jason at gcc dot gnu.org> changed:
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--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Merged for GCC 10.
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Subject: [Bug c++/88323] implement C++20 language features.
Date: Mon, 14 Oct 2019 19:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88323
Bug 88323 depends on bug 88329, which changed state.
Bug 88329 Summary: Implement C++20 std concepts.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88329
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug c++/67491] [meta-bug] concepts issues
Date: Mon, 14 Oct 2019 19:50:00 -0000
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Bug 67491 depends on bug 88329, which changed state.
Bug 88329 Summary: Implement C++20 std concepts.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88329
What |Removed |Added
----------------------------------------------------------------------------
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>From gcc-bugs-return-656399-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 20:07:00 2019
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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/92074] [10 regression] 26% performance regression on Spec2017 548.exchange2_r
Date: Mon, 14 Oct 2019 20:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92074
--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
The regression is because we now inline covered into digits2:
IPA function summary for digits_2/29 inlinable
global time: 1553.078985
self size: 1295
global size: 1295
min size: 0
self stack: 261
global stack: 261
size:981.000000, time:1505.442572
size:3.000000, time:1.999121, executed if:(not inlined)
size:0.500000, time:0.500000, executed if:(not inlined), nonconst
if:(op0[ref offset: 0] changed) && (not inlined)
size:210.500000, time:27.456610, nonconst if:(op0[ref offset: 0] changed)
size:21.000000, time:3.795164, executed if:(op0[ref offset: 0] == 5)
size:6.000000, time:0.334389, executed if:(op0[ref offset: 0] != 8)
size:1.000000, time:0.033237, executed if:(op0[ref offset: 0] != 8),
nonconst if:(op0[ref offset: 0] changed) && (op0[ref offset: 0] != 8)
size:66.000000, time:13.130882, executed if:(op0[ref offset: 0] == 8)
loop iterations:(op0[ref offset: 0] changed)
calls:
digits_2/29 function not considered for inlining
loop depth: 9 freq:0.03 size: 2 time: 11callee size:647 stack:261
predicate: (op0[ref offset: 0] != 8)
op0 is compile time invariant
covered.constprop/93 function not considered for inlining
loop depth: 9 freq:0.00 size: 4 time: 13callee size:214 stack:1472
predicate: (op0[ref offset: 0] == 8)
op0 is compile time invariant
op1 is compile time invariant
digits_2 is quite deeply recursive and inlining quite expensive function
"covered" does not help.
This can be solved by --param inline-heuristics-hint-percent=600
the current default of 1600 is way too high and I scheduled some benchmarks to
tune it down but unfortunately our LNT benchmarking is down currently. (I would
like to see it reduced to even lower value if polyhedron and SPEC testing is
happy about that)
Generally it would be nice if inliner understood that inlining into self
recursive functions on the path that is not going to recursion may be harmful.
This we do not model and thus this works/does not work sort of randomly.
>From gcc-bugs-return-656400-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 20:14:26 2019
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Subject: [Bug c++/91930] [10 Regression] internal compiler error: in lazily_declare_fn, at cp/method.c:2423 with -fconcepts
Date: Mon, 14 Oct 2019 20:14:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91930
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Mon Oct 14 20:13:49 2019
New Revision: 276968
URL: https://gcc.gnu.org/viewcvs?rev=276968&root=gcc&view=rev
Log:
PR c++/91930 - ICE with constrained inherited default ctor.
The testcase was crashing because lazily_declare_fn was failing to add a
defaulted constructor, because the implicit declaration was less constrained
than the inherited default constructor. But when we have an inherited
constructor, we shouldn't be trying to declare a default constructor in the
first place, because it counts as "a user-declared constructor". With that
fixed I needed to adjust a couple of inherited constructor testcases that
previously had been diagnosing the default constructor as deleted rather
than not declared.
* name-lookup.c (do_class_using_decl): Set TYPE_HAS_USER_CONSTRUCTOR
for inherited constructor.
Added:
trunk/gcc/testsuite/g++.dg/cpp2a/concepts-inherit-ctor6.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/name-lookup.c
trunk/gcc/testsuite/g++.dg/cpp0x/inh-ctor5.C
trunk/gcc/testsuite/g++.dg/cpp1z/inh-ctor22.C
>From gcc-bugs-return-656401-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 20:19:25 2019
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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/92091] New: Inconsistent diagnostics for INCLUDE vs. #include
Date: Mon, 14 Oct 2019 20:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92091
Bug ID: 92091
Summary: Inconsistent diagnostics for INCLUDE vs. #include
Product: gcc
Version: 10.0
Status: UNCONFIRMED
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Priority: P3
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For files included via INCLUDE, the diagnostics printed may be incomplete
when the included file resides in a different directory. There is no
problem when using #include.
Reproducer:
% cat bug.f90
module bug
implicit none
public
include 'inc1.f90'
include 'inc2.f90'
end module bug
# cat bug.F90
module bug
implicit none
public
#include "inc1.f90"
#include "inc2.f90"
end module bug
% cat otherdir/inc1.f90
character*1 c
% cat inc2.f90
character*2 d
Using e.g. svn rev.276967, I get:
% gfc-10 -c bug.f90 -Iotherdir -std=f2008
inc1.f90:1:14:
Warning: Obsolescent feature: Old-style character length at (1)
inc2.f90:1:14:
1 | character*2 d
| 1
Warning: Obsolescent feature: Old-style character length at (1)
% gfc-10 -c bug.F90 -Iotherdir -std=f2008
otherdir/inc1.f90:1:14:
1 | character*1 c
| 1
Warning: Obsolescent feature: Old-style character length at (1)
inc2.f90:1:14:
1 | character*2 d
| 1
Warning: Obsolescent feature: Old-style character length at (1)
Note that the diagnostics for inc1.f90 is incomplete for INCLUDE.
Also, the filename does not show the full path in that case. Not
sure if this is relevant to the issue.
This affects all gcc versions down to at least 7.x, so no regression.
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Subject: [Bug fortran/92091] Inconsistent diagnostics for INCLUDE vs. #include
Date: Mon, 14 Oct 2019 20:20:00 -0000
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anlauf at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P5
Known to fail| |10.0, 7.4.1, 8.3.1, 9.2.1
>From gcc-bugs-return-656403-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 20:23:02 2019
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From: "gnu at kosak dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/92092] New: Spurious warning: '<anonymous>' may be used uninitialized in this function
Date: Mon, 14 Oct 2019 20:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92092
Bug ID: 92092
Summary: Spurious warning: '<anonymous>' may be used
uninitialized in this function
Product: gcc
Version: 9.2.0
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Hello,
The program below gets the following warning message. I think the program is
well-formed (Clang 9.0.0 accepts it without warning).
** Compiler Flags **
-O2 -std=c++17 -Wall
** Version **
gcc 9.2.0, tested online with Compiler Explorer ( https://gcc.godbolt.org/ )
but the warning happens on my Ubuntu machine as well (that version is gcc
8.3.0)
** Warning **
source>: In static member function 'static _Res
std::_Function_handler<_Res(_ArgTypes ...), _Functor>::_M_invoke(const
std::_Any_data&, _ArgTypes&& ...) [with _Res = std::optional<Color>; _Functor =
main()::<lambda()>; _ArgTypes = {}]':
<source>:13:33: warning: '<anonymous>' may be used uninitialized in this
function [-Wmaybe-uninitialized]
13 | return std::optional<Color>();
** Source code **
#include <functional>
#include <optional>
enum class Color { Red, Green, Blue };
size_t load(size_t);
int main() {
size_t currentValue = load(0);
auto ready = [currentValue]() -> std::optional<Color> {
if (load(1) != currentValue) {
return Color::Red;
}
return std::optional<Color>();
};
std::function<std::optional<Color>()> temp(ready);
(void)temp;
}
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Subject: [Bug testsuite/92093] New: New test case gcc.target/powerpc/pr91275.c from r276410 fails on BE
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92093
Bug ID: 92093
Summary: New test case gcc.target/powerpc/pr91275.c from
r276410 fails on BE
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: testsuite
Assignee: unassigned at gcc dot gnu.org
Reporter: seurer at gcc dot gnu.org
Target Milestone: ---
Saw this on a power 8 BE machine.
make -k check-gcc RUNTESTFLAGS=powerpc.exp=gcc.target/powerpc/pr91275.c
FAIL: gcc.target/powerpc/pr91275.c execution test
Executing on host: /home/seurer/gcc/build/gcc-test2/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test2/gcc/
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.target/powerpc/pr91275.c
-fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -O2 -std=gnu11 -lm -o ./pr91275.exe (timeout =
300)
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-test2/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test2/gcc/
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.target/powerpc/pr91275.c
-fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -O2 -std=gnu11 -lm -o ./pr91275.exe
PASS: gcc.target/powerpc/pr91275.c (test for excess errors)
Setting LD_LIBRARY_PATH to
:/home/seurer/gcc/build/gcc-test2/gcc::/home/seurer/gcc/build/gcc-test2/gcc:/home/seurer/gcc/build/gcc-test2/./gmp/.libs:/home/seurer/gcc/build/gcc-test2/./prev-gmp/.libs:/home/seurer/gcc/build/gcc-test2/./mpfr/src/.libs:/home/seurer/gcc/build/gcc-test2/./prev-mpfr/src/.libs:/home/seurer/gcc/build/gcc-test2/./mpc/src/.libs:/home/seurer/gcc/build/gcc-test2/./prev-mpc/src/.libs:/home/seurer/gcc/build/gcc-test2/./isl/.libs:/home/seurer/gcc/build/gcc-test2/./prev-isl/.libs:/home/seurer/gcc/install/gcc-7.2.0/lib64
Execution timeout is: 300
spawn [open ...]
FAIL: gcc.target/powerpc/pr91275.c execution test
>From gcc-bugs-return-656405-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 20:36:03 2019
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From: "andrew.n.sutton at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/71125] [concepts] Spurious 'invalid reference to function concept error' issued when overloads are not all declared with the concept specifier
Date: Mon, 14 Oct 2019 20:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71125
--- Comment #3 from Andrew Sutton <andrew.n.sutton at gmail dot com> ---
The TS did allow overloading function concepts.
Function concepts have some parsing issues related to TS-style terse notation,
overloading and variadic templates. In particular, there are places where
writing C<T> forms a (possibly) syntactically valid placeholder C<?, T> as part
of a functional cast expression, which leads to the error you're seeing: you're
incompletely instantiating a template-id that resolved to the template with two
parameters.
I think that's the error you're seeing here, but I wouldn't consider the issue
a show stopper. After all, function concepts don't exist in C++20 and they
can't be overloaded.
That said, I'm okay leaving this open.
>From gcc-bugs-return-656406-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 20:41:57 2019
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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/92094] New: ice in vect_transform_stmt at tree-vect-stmts.c:10921
Date: Mon, 14 Oct 2019 20:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92094
Bug ID: 92094
Summary: ice in vect_transform_stmt at tree-vect-stmts.c:10921
Product: gcc
Version: 10.0
Status: UNCONFIRMED
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Created attachment 47033
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47033&action=edit
fortran source code
The attached fortran code does this with recent gcc trunk and
compiler flag -O3
during GIMPLE pass: vect
lhesfcn.f:1:0:
1 | subroutine hesfcn(n,x,h,ldh,nprob)
|
internal compiler error: Segmentation fault
0xf2cd8f crash_signal
../../trunk/gcc/toplev.c:326
0x11a8772 vect_transform_stmt(_stmt_vec_info*, gimple_stmt_iterator*,
_slp_tree*, _slp_instance*)
../../trunk/gcc/tree-vect-stmts.c:10921
0x11ba341 vect_transform_loop(_loop_vec_info*)
../../trunk/gcc/tree-vect-loop.c:8292
0x11ded9d try_vectorize_loop_1
../../trunk/gcc/tree-vectorizer.c:983
The bug seems to start sometime from revision 276750 to 276800.
>From gcc-bugs-return-656407-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 21:05:54 2019
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Subject: [Bug fortran/92091] Inconsistent diagnostics for INCLUDE vs. #include
Date: Mon, 14 Oct 2019 21:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92091
--- Comment #1 from kargl at gcc dot gnu.org ---
(In reply to anlauf from comment #0)
> For files included via INCLUDE, the diagnostics printed may be incomplete
> when the included file resides in a different directory. There is no
> problem when using #include.
>
> Reproducer:
>
> % cat bug.f90
> module bug
> implicit none
> public
> include 'inc1.f90'
> include 'inc2.f90'
> end module bug
>
> # cat bug.F90
> module bug
> implicit none
> public
> #include "inc1.f90"
> #include "inc2.f90"
> end module bug
>
> % cat otherdir/inc1.f90
> character*1 c
>
> % cat inc2.f90
> character*2 d
>
>
> Using e.g. svn rev.276967, I get:
>
> % gfc-10 -c bug.f90 -Iotherdir -std=f2008
> inc1.f90:1:14:
>
> Warning: Obsolescent feature: Old-style character length at (1)
> inc2.f90:1:14:
>
> 1 | character*2 d
> | 1
> Warning: Obsolescent feature: Old-style character length at (1)
>
> % gfc-10 -c bug.F90 -Iotherdir -std=f2008
> otherdir/inc1.f90:1:14:
>
> 1 | character*1 c
> | 1
> Warning: Obsolescent feature: Old-style character length at (1)
> inc2.f90:1:14:
>
> 1 | character*2 d
> | 1
> Warning: Obsolescent feature: Old-style character length at (1)
>
>
> Note that the diagnostics for inc1.f90 is incomplete for INCLUDE.
> Also, the filename does not show the full path in that case. Not
> sure if this is relevant to the issue.
>
Technical the full path isn't shown for any of your examples.
>From gcc-bugs-return-656408-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 21:11:21 2019
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Subject: [Bug c++/79591] [concepts] failure to distinguish overloads from different namespaces with differing constraints
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed by merge, test is g++.dg/cpp2a/concepts-using1.C.
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
Bug 67491 depends on bug 79591, which changed state.
Bug 79591 Summary: [concepts] failure to distinguish overloads from different namespaces with differing constraints
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79591
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |FIXED
>From gcc-bugs-return-656411-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 21:16:34 2019
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
Bug 67491 depends on bug 67348, which changed state.
Bug 67348 Summary: [concepts] Constraints, special member functions, and default/delete
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67348
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug c++/67348] [concepts] Constraints, special member functions, and default/delete
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Jason Merrill <jason at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Implemented for GCC 10.
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Subject: [Bug other/92090] [10 regression] ICE in gcc.dg/atomic/c11-atomic-exec-5.c starting with r276469
Date: Mon, 14 Oct 2019 21:25:00 -0000
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--- Comment #2 from seurer at gcc dot gnu.org ---
Also
gcc.target/powerpc/vsx-builtin-7.c
FAIL: gcc.target/powerpc/vsx-builtin-7.c scan-assembler-times \\mrldic\\M 64
>From gcc-bugs-return-656413-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 21:33:38 2019
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Subject: [Bug rtl-optimization/91994] [10 Regression] r276327 breaks -mvzeroupper
Date: Mon, 14 Oct 2019 21:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91994
--- Comment #13 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Is this still a problem? I think Uros's patch fixed the problem
mentioned in comment #9.
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Subject: [Bug fortran/92094] ice in vect_transform_stmt at tree-vect-stmts.c:10921
Date: Mon, 14 Oct 2019 21:35:00 -0000
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kargl at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kargl at gcc dot gnu.org
--- Comment #1 from kargl at gcc dot gnu.org ---
Reduced testcase. This fixed-form source code.
subroutine hesfcn(n, x, h, ldh)
integer n,ldh
double precision x(n), h(ldh)
integer i,j,k,kj
double precision r,th,u1,u2,v,v1,v2,fvec1(50)
fvec1 = 0
do 770 j = 1, n
kj = kj - j
do 760 k = 1, j
kj = kj + 1
v1 = 1
v2 = 2*x(k) - 1
v = 2*v2
u1 = 0
u2 = 2
do 750 i = 1, n
h(kj) = h(kj) + fvec1(i)*u2
th = 4*v2 + v*u2 - u1
u1 = u2
u2 = th
th = v*v2 - v1
750 continue
760 continue
770 continue
end
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Subject: [Bug fortran/92004] [10 Regression] Rejection of different ranks for dummy array argument where actual argument is an element
Date: Mon, 14 Oct 2019 21:38:00 -0000
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--- Comment #1 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Mon Oct 14 21:37:34 2019
New Revision: 276972
URL: https://gcc.gnu.org/viewcvs?rev=276972&root=gcc&view=rev
Log:
2019-10-14 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/92004
* array.c (expand_constructor): Set from_constructor on
expression.
* gfortran.h (gfc_symbol): Add maybe_array.
(gfc_expr): Add from_constructor.
* interface.c (maybe_dummy_array_arg): New function.
(compare_parameter): If the formal argument is generated from a
call, check the conditions where an array element could be
passed to an array. Adjust error message for assumed-shape
or pointer array. Use correct language for assumed shaped arrays.
(gfc_get_formal_from_actual_arglist): Set maybe_array on the
symbol if the actual argument is an array element fulfilling
the conditions of 15.5.2.4.
2019-10-14 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/92004
* gfortran.dg/argument_checking_24.f90: New test.
* gfortran.dg/abstract_type_6.f90: Add error message.
* gfortran.dg/argument_checking_11.f90: Correct wording
in error message.
* gfortran.dg/argumeent_checking_13.f90: Likewise.
* gfortran.dg/interface_40.f90: Add error message.
Added:
trunk/gcc/testsuite/gfortran.dg/argument_checking_24.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/array.c
trunk/gcc/fortran/gfortran.h
trunk/gcc/fortran/interface.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/abstract_type_6.f03
trunk/gcc/testsuite/gfortran.dg/argument_checking_11.f90
trunk/gcc/testsuite/gfortran.dg/argument_checking_13.f90
trunk/gcc/testsuite/gfortran.dg/interface_40.f90
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Subject: [Bug fortran/92004] [10 Regression] Rejection of different ranks for dummy array argument where actual argument is an element
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Fixed, closing.
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From: "slyfox at inbox dot ru" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/92095] New: ICE on sparc-gcc -O1 -mcpu=niagara2 -fPIE: validize_mem(rtx_def*): gcc/gcc/explow.c:521
Date: Mon, 14 Oct 2019 21:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92095
Bug ID: 92095
Summary: ICE on sparc-gcc -O1 -mcpu=niagara2 -fPIE:
validize_mem(rtx_def*): gcc/gcc/explow.c:521
Product: gcc
Version: 10.0
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Target Milestone: ---
Originally reported by Rolf Eike Beer as a build failure of python-3.6.9:
https://bugs.gentoo.org/697708
Here is the minimal reproducer against ghc-master:
$ cat bug.c
// sparc-unknown-linux-gnu-gcc -O1 -mcpu=niagara2 -fPIE -c bug.c -o bug.o
typedef union {
double a;
int b[2];
} c;
double d(int e) {
c f;
(&f)->b[0] = 15728640;
return e ? -(&f)->a : (&f)->a;
}
$ gcc/xgcc -Bgcc -O1 -mcpu=niagara2 -fPIE -c bug.c -o bug.o
during RTL pass: reload
bug.c: In function 'd':
bug.c:10:1: internal compiler error: Segmentation fault
10 | }
| ^
$ gcc/xgcc -Bgcc -v
Reading specs from /home/slyfox/dev/git/gcc-sparc/gcc/specs
COLLECT_GCC=/home/slyfox/dev/git/gcc-sparc/gcc/xgcc
COLLECT_LTO_WRAPPER=/home/slyfox/dev/git/gcc-sparc/gcc/lto-wrapper
Target: sparc-unknown-linux-gnu
Configured with: ../gcc/configure --target=sparc-unknown-linux-gnu
--with-sysroot=/usr/sparc-unknown-linux-gnu --enable-languages=c
--disable-bootstrap
--prefix=/home/slyfox/dev/git/gcc-sparc/../gcc-sparc-installed
--disable-multilib --without-isl cross_compiling=yes
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.0 20191014 (experimental) (GCC)
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Subject: [Bug rtl-optimization/92095] ICE on sparc-gcc -O1 -mcpu=niagara2 -fPIE: validize_mem(rtx_def*): gcc/gcc/explow.c:521
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--- Comment #1 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Created attachment 47034
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47034&action=edit
bug.c
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Subject: [Bug fortran/92094] ice in vect_transform_stmt at tree-vect-stmts.c:10921
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--- Comment #2 from kargl at gcc dot gnu.org ---
(In reply to kargl from comment #1)
> Reduced testcase. This fixed-form source code.
>
> subroutine hesfcn(n, x, h, ldh)
> integer n,ldh
> double precision x(n), h(ldh)
>
> integer i,j,k,kj
> double precision r,th,u1,u2,v,v1,v2,fvec1(50)
>
> fvec1 = 0
>
> do 770 j = 1, n
> kj = kj - j
> do 760 k = 1, j
> kj = kj + 1
> v1 = 1
> v2 = 2*x(k) - 1
> v = 2*v2
> u1 = 0
> u2 = 2
> do 750 i = 1, n
> h(kj) = h(kj) + fvec1(i)*u2
> th = 4*v2 + v*u2 - u1
> u1 = u2
> u2 = th
> th = v*v2 - v1
> 750 continue
> 760 continue
> 770 continue
>
> end
Farther reduction.
subroutine hesfcn(n, x, h, ldh)
integer n,ldh
double precision x(n), h(ldh)
integer i,j,k,kj
double precision th,u1,u2,v2
kj = 0
do 770 j = 1, n
kj = kj - j
do 760 k = 1, j
kj = kj + 1
v2 = 2 * x(k) - 1
u1 = 0
u2 = 2
do 750 i = 1, n
h(kj) = h(kj) + u2
th = 4 * v2 + u2 - u1
u1 = u2
u2 = th
th = v2 - 1
750 continue
760 continue
770 continue
end
>From gcc-bugs-return-656420-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 22:25:49 2019
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Subject: [Bug tree-optimization/92085] [10 Regression] ICE: tree check: expected class 'type', have 'exceptional' (error_mark) in useless_type_conversion_p, at gimple-expr.c:86
Date: Mon, 14 Oct 2019 22:25:00 -0000
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--- Comment #4 from prathamesh3492 at gcc dot gnu.org ---
Patch posted upstream: https://gcc.gnu.org/ml/gcc-patches/2019-10/msg01031.html
Thanks,
Prathamesh
>From gcc-bugs-return-656421-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 22:32:38 2019
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From: "rogero at howzatt dot demon.co.uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/92096] New: segmentation fault in 'example_labels' building gcc trunk on cygwin
Date: Mon, 14 Oct 2019 22:32:00 -0000
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Bug ID: 92096
Summary: segmentation fault in 'example_labels' building gcc
trunk on cygwin
Product: gcc
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I using this invocation:
../gcc-trunk/configure --disable-bootstrap --enable-languages=c,c++
--enable-threads=posix --prefix=/usr/share/gcc-trunk
make then fails with:
...
In function ‘example_labels’:
cc1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
make[2]: *** [../../gcc-trunk/gcc/c/Make-lang.in:124: s-selftest-c] Error 1
make[2]: *** Waiting for unfinished jobs....
...
If I drill down:
$ cd gcc
$ make selftest
./xgcc -B./ -B/usr/share/gcc-trunk/x86_64-pc-cygwin/bin/ -isystem
/usr/share/gcc-trunk/x86_64-pc-cygwin/include -isystem
/usr/share/gcc-trunk/x86_64-pc-cygwin/sys-include
-L/cygdrive/c/Projects/gcc/build/gcc/../ld -xc -nostdinc /dev/null -S -o
/dev/null -fself-test=../../gcc-trunk/gcc/testsuite/selftests
In function ‘example_labels’:
cc1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
make: *** [../../gcc-trunk/gcc/c/Make-lang.in:124: s-selftest-c] Error 1
Last clean build was svn revision 276847
First seg fault was svn revision 276902
>From gcc-bugs-return-656422-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 22:39:52 2019
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/71125] [concepts] Spurious 'invalid reference to function concept error' issued when overloads are not all declared with the concept specifier
Date: Mon, 14 Oct 2019 22:39:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|WAITING |NEW
Severity|normal |enhancement
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Casey Carter from comment #2)
> (In reply to Jonathan Wakely from comment #1)
> > Is this valid in C++20?
>
> Definitely not: there are no concept functions in C++20.
Right, sorry I was unclear ... I modernised Tom's original code to use C++20
syntax, which still fails to compile, and was asking about that version ...
which I didn't actually post and somehow expected everybody to know what I
meant. Oops.
The code I tested was:
template<typename T>
constexpr bool C1() { return true; }
template<typename T, typename U>
concept C1 = true;
template<typename T>
requires C1<T>
void f1() {}
// Removing the unused overload avoids the error:
template<typename T>
constexpr bool C2() { return true; }
template<typename T>
requires C2<T> // Ok.
void f2() {}
// Swapping the order of the declarations avoids the error:
template<typename T, typename U>
concept C3 = true;
template<typename T>
constexpr bool C3() { return true; }
template<typename T>
requires C3<T> // Ok.
void f3() {}
// Swapping the overload that is resolved avoids the error:
template<typename T>
constexpr bool C4() { return true; }
template<typename T, typename U>
concept C4 = true;
template<typename T>
requires C4<T,int> // Ok.
void f4() {}
// Swapping which overload is declared with the concept specifier avoids the
error:
template<typename T>
concept C5 = true;
template<typename T, typename U>
constexpr bool C5() { return true; }
template<typename T>
requires C5<T> // Ok.
void f5() {}
And the diagnostics from trunk are:
71125.cc:4:18: error: 'template<class T, class U> concept C1' conflicts with a
previous declaration
4 | concept C1 = true;
| ^
71125.cc:2:16: note: previous declaration 'constexpr bool C1()'
2 | constexpr bool C1() { return true; }
| ^~
71125.cc:6:12: error: constraint expression does not have type 'bool'
6 | requires C1<T>
| ^~~~~
71125.cc:13:12: error: constraint expression does not have type 'bool'
13 | requires C2<T> // Ok.
| ^~~~~
71125.cc:20:19: error: 'template<class T> constexpr bool C3()' conflicts with a
previous declaration
20 | constexpr bool C3() { return true; }
| ^
71125.cc:18:9: note: previous declaration 'template<class T, class U> concept
C3'
18 | concept C3 = true;
| ^~
71125.cc:22:12: error: wrong number of template arguments (1, should be 2)
22 | requires C3<T> // Ok.
| ^~~~~
71125.cc:18:9: note: provided for 'template<class T, class U> concept C3'
18 | concept C3 = true;
| ^~
71125.cc:29:18: error: 'template<class T, class U> concept C4' conflicts with a
previous declaration
29 | concept C4 = true;
| ^
71125.cc:27:16: note: previous declaration 'constexpr bool C4()'
27 | constexpr bool C4() { return true; }
| ^~
71125.cc:31:12: error: constraint expression does not have type 'bool'
31 | requires C4<T,int> // Ok.
| ^~~~~~~~~
71125.cc:38:19: error: 'template<class T, class U> constexpr bool C5()'
conflicts with a previous declaration
38 | constexpr bool C5() { return true; }
| ^
71125.cc:36:9: note: previous declaration 'template<class T> concept C5'
36 | concept C5 = true;
| ^~
I think the "conflicts with a previous declaration" diagnostic is reasonable.
Maybe "redeclared as a different kind of symbol" would also work.
I'll recategorise it as a diagnostic enhancement and confirm it, but I think
closing it would also be fine.
>From gcc-bugs-return-656423-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 22:41:38 2019
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Subject: [Bug libstdc++/92057] variant converting constructor fails for primitives
Date: Mon, 14 Oct 2019 22:41:00 -0000
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--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It does. The array initialization uses a braced-init-list, which is the context
in which narrowing conversions are diagnosed.
Please take this to stackoverflow if you're unclear what the change entails.
There is no bug in GCC here.
>From gcc-bugs-return-656424-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 22:44:59 2019
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Subject: [Bug libstdc++/92057] variant converting constructor fails for primitives
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--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to pj from comment #9)
> The only modification described by the paper (relevant to this case) is the
> requirement that `T_i x[] = {std::forward<T>(t)};` is well formed,
That code gives you a diagnostic, as required for a narrowing conversion. G++
chooses to give a warning for some narrowing conversions (see the manual for
details) because otherwise too much reasonable code is rejected. A warning is a
diagnostic, so this is allowed by the standard.
In SFINAE contexts narrowing conversions are always disallowed, not
justwarnings. The variant constraints are SFINAE contexts. So narrowing
conversions are disallowed.
There is no GCC bug here. Really.
>From gcc-bugs-return-656425-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 22:47:31 2019
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Subject: [Bug c++/84299] warning: '<anonymous>' may be used uninitialized in this function
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |INVALID
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Closing due to lack of testcase.
>From gcc-bugs-return-656426-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 22:47:32 2019
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Subject: [Bug middle-end/24639] [meta-bug] bug to track all Wuninitialized issues
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Bug 24639 depends on bug 84299, which changed state.
Bug 84299 Summary: warning: '<anonymous>' may be used uninitialized in this function
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84299
What |Removed |Added
----------------------------------------------------------------------------
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>From gcc-bugs-return-656429-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 14 22:52:35 2019
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Subject: [Bug middle-end/24639] [meta-bug] bug to track all Wuninitialized issues
Date: Mon, 14 Oct 2019 22:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24639
Bug 24639 depends on bug 92011, which changed state.
Bug 92011 Summary: '<anonymous>' may be used uninitialized in this function with std::optional<T>()
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92011
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
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Subject: [Bug c++/80635] std::optional and bogus -Wmaybe-uninitialized warning
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |joerg.richter@pdv-fs.de
--- Comment #21 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 92011 has been marked as a duplicate of this bug. ***
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Subject: [Bug c++/92011] '<anonymous>' may be used uninitialized in this function with std::optional<T>()
Date: Mon, 14 Oct 2019 22:52:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, I think so.
*** This bug has been marked as a duplicate of bug 80635 ***
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Subject: [Bug c++/80635] std::optional and bogus -Wmaybe-uninitialized warning
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80635
--- Comment #22 from Jonathan Wakely <redi at gcc dot gnu.org> ---
From Bug 92011:
cat > t.cc <<EOF
#include <optional>
struct Bar
{
int size_;
Bar( int size )
: size_( size )
{}
};
template<class T>
Bar get( T const& val )
{
return Bar( __builtin_strlen(val) );
}
class Foo
{
int size2_;
public:
Foo()
{}
template<class T>
Foo( T const& t )
: size2_( get<T>( t ).size_ )
{}
};
enum Enum
{};
bool parseImpl2( Foo s, Enum* val )
{
*val = Enum();
for(;;)
{
s = "aa";
if( true )
return false;
return true;
}
}
template<class T> std::optional<T> parse2( Foo str )
{
T res = T();
if( parseImpl2( str, &res ) )
return res;
return std::optional<T>();
}
Enum transform()
{
if( auto r = parse2<Enum>( Foo() ) )
return *r;
return {};
}
EOF
gcc -std=c++17 -c -o t.cc.o t.cc -Wall -O1
####
Gives:
t.cc: In function 'Enum transform()':
t.cc:50:27: warning: '<anonymous>' may be used uninitialized in this function
[-Wmaybe-uninitialized]
50 | return std::optional<T>();
| ^
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Subject: [Bug c++/80635] std::optional and bogus -Wmaybe-uninitialized warning
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80635
--- Comment #24 from Jonathan Wakely <redi at gcc dot gnu.org> ---
From Bug 92092:
The program below gets the following warning message. I think the program is
well-formed (Clang 9.0.0 accepts it without warning).
** Compiler Flags **
-O2 -std=c++17 -Wall
** Version **
gcc 9.2.0, tested online with Compiler Explorer ( https://gcc.godbolt.org/ )
but the warning happens on my Ubuntu machine as well (that version is gcc
8.3.0)
** Warning **
source>: In static member function 'static _Res
std::_Function_handler<_Res(_ArgTypes ...), _Functor>::_M_invoke(const
std::_Any_data&, _ArgTypes&& ...) [with _Res = std::optional<Color>; _Functor =
main()::<lambda()>; _ArgTypes = {}]':
<source>:13:33: warning: '<anonymous>' may be used uninitialized in this
function [-Wmaybe-uninitialized]
13 | return std::optional<Color>();
** Source code **
#include <functional>
#include <optional>
enum class Color { Red, Green, Blue };
size_t load(size_t);
int main() {
size_t currentValue = load(0);
auto ready = [currentValue]() -> std::optional<Color> {
if (load(1) != currentValue) {
return Color::Red;
}
return std::optional<Color>();
};
std::function<std::optional<Color>()> temp(ready);
(void)temp;
}
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Subject: [Bug c++/92092] Spurious warning: '<anonymous>' may be used uninitialized in this function
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
dup
*** This bug has been marked as a duplicate of bug 80635 ***
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Subject: [Bug c++/80635] std::optional and bogus -Wmaybe-uninitialized warning
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |gnu at kosak dot com
--- Comment #23 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 92092 has been marked as a duplicate of this bug. ***
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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/89943] Submodule functions are not allowed to have C binding
Date: Tue, 15 Oct 2019 00:29:00 -0000
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--- Comment #4 from kargl at gcc dot gnu.org ---
Author: kargl
Date: Tue Oct 15 00:28:47 2019
New Revision: 276983
URL: https://gcc.gnu.org/viewcvs?rev=276983&root=gcc&view=rev
Log:
2019-10-14 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/89943
decl.c (gfc_match_function_decl): Ignore duplicate BIND(C) for function
declaration in submodule. Implement at check for F2018 C1550.
(gfc_match_entry): Use temporary for locus, which allows removal of
one gfc_error_now().
(gfc_match_subroutine): Ignore duplicate BIND(C) for subroutine
declaration in submodule. Implement at check for F2018 C1550.
2019-10-14 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/89943
* gfortran.dg/pr89943_1.f90: New test.
* gfortran.dg/pr89943_2.f90: Ditto.
* gfortran.dg/pr89943_3.f90: Ditto.
* gfortran.dg/pr89943_4.f90: Ditto.
Added:
trunk/gcc/testsuite/gfortran.dg/pr89943_1.f90
trunk/gcc/testsuite/gfortran.dg/pr89943_2.f90
trunk/gcc/testsuite/gfortran.dg/pr89943_3.f90
trunk/gcc/testsuite/gfortran.dg/pr89943_4.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/decl.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/83113] Bogus "duplicate allocatable attribute" error for submodule character function
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
CC| |kargl at gcc dot gnu.org
--- Comment #6 from kargl at gcc dot gnu.org ---
Just committed revision 276983. Forgot to include PR number so commit log
isn't shown.
>From gcc-bugs-return-656436-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 00:54:32 2019
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Subject: [Bug target/70010] powerpc: -flto forgets 'no-vsx' function attributes
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Peter Bergner <bergner at gcc dot gnu.org> changed:
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| |patches/2019-10/msg01037.ht
| |ml
Last reconfirmed| |2019-10-15
Ever confirmed|0 |1
--- Comment #6 from Peter Bergner <bergner at gcc dot gnu.org> ---
Confirmed. I posted a possible patch.
>From gcc-bugs-return-656437-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 01:18:07 2019
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Subject: [Bug c++/67692] [concepts] ICE when using requires in non-concept contexts
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Jason Merrill <jason at gcc dot gnu.org> changed:
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--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed by concepts merge.
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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Bug 67491 depends on bug 67692, which changed state.
Bug 67692 Summary: [concepts] ICE when using requires in non-concept contexts
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67692
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>From gcc-bugs-return-656439-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 01:23:13 2019
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Subject: [Bug c++/88323] implement C++20 language features.
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Bug 88323 depends on bug 91369, which changed state.
Bug 91369 Summary: Implement P0784R7: constexpr new
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91369
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Jason Merrill <jason at gcc dot gnu.org> changed:
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--- Comment #11 from Jason Merrill <jason at gcc dot gnu.org> ---
Implemented.
>From gcc-bugs-return-656441-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 02:41:51 2019
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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/92097] New: instrutions only vaild under TARGET_AVX
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Bug ID: 92097
Summary: instrutions only vaild under TARGET_AVX
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: crazylht at gmail dot com
CC: hjl.tools at gmail dot com, uros at gcc dot gnu.org
Target Milestone: ---
Target: i386, x86-64
According to intel sdm, "sqrtss" is under TARGET_SSE, "vsqrtss" is under
TARGET_AVX, so define_insn *rsqrtsf2_sse should be under TARGET_AVX but it is
TARGET_SSE now, is it on purpose?
-----
(define_insn "*rsqrtsf2_sse"
[(set (match_operand:SF 0 "register_operand" "=x,x,x")
(unspec:SF [(match_operand:SF 1 "nonimmediate_operand" "0,x,m")]
UNSPEC_RSQRT))]
"TARGET_SSE && TARGET_SSE_MATH"
"@
%vrsqrtss\t{%d1, %0|%0, %d1}
%vrsqrtss\t{%d1, %0|%0, %d1}
%vrsqrtss\t{%1, %d0|%d0, %1}"
[(set_attr "type" "sse")
(set_attr "atom_sse_attr" "rcp")
(set_attr "btver2_sse_attr" "rcp")
(set_attr "prefix" "maybe_vex")
(set_attr "mode" "SF")
(set (attr "preferred_for_speed")
(cond [(eq_attr "alternative" "1")
(symbol_ref "TARGET_AVX || !TARGET_SSE_PARTIAL_REG_DEPENDENCY")
(eq_attr "alternative" "2")
(symbol_ref "!TARGET_SSE_PARTIAL_REG_DEPENDENCY")
]
(symbol_ref "true")))])
-----
also for *sqrt<mode>2_sse,*rcpsf2_sse
Similar for sse4_1_round<mode>2
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Subject: [Bug target/92097] instrutions only vaild under TARGET_AVX
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
You are missing the point of %v here.
See ASM_OUTPUT_AVX_PREFIX .
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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/92097] instrutions only vaild under TARGET_AVX
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--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> You are missing the point of %v here.
> See ASM_OUTPUT_AVX_PREFIX .
Yes, thanks.
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Subject: [Bug tree-optimization/92098] New: After r262333, the following code cannot be vectorized on powerpc64le.
Date: Tue, 15 Oct 2019 03:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92098
Bug ID: 92098
Summary: After r262333, the following code cannot be vectorized
on powerpc64le.
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: helijia at gcc dot gnu.org
Target Milestone: ---
Created attachment 47035
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47035&action=edit
dump file(Includes dump files that can be vectorized and not vectorized)
For the following code
---
#define NIL 0
typedef struct {
unsigned int hash_size;
unsigned short * head, * prev;
unsigned int w_size;
} deflate_state;
void slide_hash(deflate_state *s)
{
unsigned n, m;
unsigned short *p;
unsigned int wsize = s->w_size;
n = s->hash_size;
p = &s->head[n];
do {
m = *--p;
*p = (unsigned short)(m >= wsize ? m - wsize : NIL);
} while (--n);
}
---
The compile command I used is
cc1 a.c -Ofast -fdump-tree-vect-details-all -fdump-tree-slp-details-all
we found r262333 will cause it can not be vectorized. Because
a.c:20:5: note: vect_is_simple_use: vectype vector(4) unsigned intD.4
a.c:20:5: note: not vectorized: relevant stmt not supported: patt_37 =
wsize_12 <= m_16;
a.c:20:5: note: bad operation or unsupported loop bound.
But before the commit this code can be vectorized.
Attachment is the file I dumped
>From gcc-bugs-return-656445-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 03:44:15 2019
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Subject: [Bug c++/92099] New: static_assert of struct template of false_type succeed with GCC8 but not GCC9
Date: Tue, 15 Oct 2019 03:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92099
Bug ID: 92099
Summary: static_assert of struct template of false_type succeed
with GCC8 but not GCC9
Product: gcc
Version: 9.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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I'm using a type-dependent struct to enable static_assert inside contexpr if.
The following code compiles fine with GCC8/clang/msvc but fails with GCC9 at
static_assert
#include <iostream>
#include <type_traits>
using namespace std;
// this cause the problem
template <typename T>
struct DependentFalse : false_type
{
};
// this works fine
template <typename T>
constexpr false_type always_false{};
enum class E
{
a,
b,
c
};
template <E id>
void f()
{
if constexpr (id == E::a)
{
cout << "a" << endl;
}
else if constexpr (id == E::b)
{
cout << "b" << endl;
}
else
{
// compile error with gcc 9.2, ok with gcc 8.3/clang/msvc
static_assert(DependentFalse<decltype(id)>::value, "Unknown id.");
// ok with both
static_assert(always_false<decltype(id)>.value, "Unknown id.");
}
}
int main()
{
f<E::a>();
}
The error message is:
main.cpp: In function ‘void f()’:
main.cpp:35:53: error: static assertion failed: Unknown id.
35 | static_assert(DependentFalse<decltype(id)>::value, "Unknown
id.");
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
>From gcc-bugs-return-656446-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 04:08:59 2019
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Subject: [Bug c/51088] undefined label with statement expression and cond expression
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Eric Gallager <egallager at gcc dot gnu.org> ---
...since Marek unassigned himself, changing status from ASSIGNED back to NEW
>From gcc-bugs-return-656447-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 04:42:06 2019
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From: "angus at agibson dot me" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libfortran/92100] New: Formatted stream IO irreproducible read with binary data in file
Date: Tue, 15 Oct 2019 04:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92100
Bug ID: 92100
Summary: Formatted stream IO irreproducible read with binary
data in file
Product: gcc
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Created attachment 47036
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47036&action=edit
Reproducing example
I have a file with mixed ASCII/binary data (a GMSH 4.1 file). Reading an ASCII
line which is followed by binary data from this file with access="stream" and
form="formatted" works as expected. However, if I save the file position before
the read, and try to repeat the read by passing pos=saved_pos, the result
differs. e.g. for the code below, on the attached test problem:
first read: $MeshFormat
re-read:
When I would expect to read the same data both times. I can get around this by
inserting a rewind statement before the second read.
program stream_test
implicit none
character(len=20) :: buf
integer :: saved_pos
open(42, file='test.txt', action='read', access='stream', form='formatted')
inquire(42, pos=saved_pos)
read(42, *) buf
print *, 'first read: ', trim(buf)
! try to re-read from the same position
! rewind(42) ! behaves as expected
read(42, *, pos=saved_pos) buf
print *, 're-read: ', trim(buf)
end program
>From gcc-bugs-return-656448-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 05:03:58 2019
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Subject: [Bug libfortran/92100] Formatted stream IO irreproducible read with binary data in file
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kargl at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
CC| |kargl at gcc dot gnu.org
--- Comment #1 from kargl at gcc dot gnu.org ---
Can you gzip the attached file? It contains binary characters, which my
browser renders as some glyphs when the attachment is accessed. Copying and
pasting from the browser is likely going to fail.
>From gcc-bugs-return-656449-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 05:05:35 2019
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Subject: [Bug libfortran/92100] Formatted stream IO irreproducible read with binary data in file
Date: Tue, 15 Oct 2019 05:05:00 -0000
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--- Comment #2 from Angus Gibson <angus at agibson dot me> ---
Created attachment 47037
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47037&action=edit
Reproducing example (gz)
>From gcc-bugs-return-656450-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 06:10:36 2019
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From: "zeccav at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/68045] [concepts] segfault in contains_struct_check ../../gcc/gcc/tree.h:2971
Date: Tue, 15 Oct 2019 06:10:00 -0000
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--- Comment #3 from Vittorio Zecca <zeccav at gmail dot com> ---
On my test case the ICE disappeared and I am now having:
gfortran -S gfbug111.f
gfbug111.f:13:6:
13 | function abc_interface(this)
| 1
Error: ABSTRACT INTERFACE ‘abc_interface’ at (1) must not have an assumed
character length result (F2008: C418)
>From gcc-bugs-return-656451-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 06:42:28 2019
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/92090] [10 regression] ICE in gcc.dg/atomic/c11-atomic-exec-5.c starting with r276469
Date: Tue, 15 Oct 2019 06:42:00 -0000
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----------------------------------------------------------------------------
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Subject: [Bug fortran/92094] ice in vect_transform_stmt at tree-vect-stmts.c:10921
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-10-15
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.
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Subject: [Bug c/92096] segmentation fault in 'example_labels' building gcc trunk on cygwin
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Sounds similar to PR92037, can you check if its fix fixed this?
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Subject: [Bug c++/92099] [9/10 Regression] static_assert of struct template of false_type succeed with GCC8 but not GCC9
Date: Tue, 15 Oct 2019 06:49:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Target Milestone|--- |9.3
Summary|static_assert of struct |[9/10 Regression]
|template of false_type |static_assert of struct
|succeed with GCC8 but not |template of false_type
|GCC9 |succeed with GCC8 but not
| |GCC9
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Subject: [Bug tree-optimization/92098] [10 Regression] After r262333, the following code cannot be vectorized on powerpc64le.
Date: Tue, 15 Oct 2019 06:50:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |powerpc64le
Target Milestone|--- |10.0
Summary|After r262333, the |[10 Regression] After
|following code cannot be |r262333, the following code
|vectorized on powerpc64le. |cannot be vectorized on
| |powerpc64le.
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Subject: [Bug c++/91369] Implement P0784R7: constexpr new
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Well, not fully. The paper has additions of constexpr keywords on the library
side, but more importantly, we'll probably need some hacks in the compiler for
the library side, but waiting for Jonathan with that.
My understanding is that right now (perhaps that might change) placement new
should not be treated as constexpr function, but it needs to be in certain STL
templates (at least std::construct_at, something else?)
Also, I was afraid that in std::allocator<T>::allocate, the cast would be
reinterpret_cast, but apparently it isn't:
template <typename T>
constexpr T *
foo ()
{
return static_cast<T *> (::operator new (sizeof (T)));
}
constexpr int
bar ()
{
auto a = foo <int> ();
::operator delete (a);
return 0;
}
constexpr auto p = bar ();
(this doesn't actually use placement new, because that does and should ATM
fail). So, maybe it is just the placement new that needs to be handled.
But, if one can cast the global replaceable allocator function result to
anything in constexpr and our implementation triggers on the cast rather than
on some spot coming from the new operator, shouldn't we use some new C++
expression kind or say an internal function as an explicit cast in new
expression (placement or not) rather than any cast of the pointer?
Note, clang++ rejects the above testcase with
/tmp/6.C:16:16: error: constexpr variable 'p' must be initialized by a constant
expression
constexpr auto p = bar ();
^ ~~~~~~
/tmp/6.C:5:28: note: cannot allocate untyped memory in a constant expression;
use 'std::allocator<T>::allocate' to allocate memory of type 'T'
return static_cast<T *> (::operator new (sizeof (T)));
^
/tmp/6.C:11:12: note: in call to 'foo()'
auto a = foo <int> ();
^
/tmp/6.C:16:20: note: in call to 'bar()'
constexpr auto p = bar ();
^
1 error generated.
Is it correct or not? The allocation function itself is not constexpr, on the
other side the wording says that the allocations should be elided in constexpr
contexts.
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Subject: [Bug c++/88323] implement C++20 language features.
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Bug 88323 depends on bug 91369, which changed state.
Bug 91369 Summary: Implement P0784R7: constexpr new
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91369
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|FIXED |---
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From: "rogero at howzatt dot demon.co.uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/92096] segmentation fault in 'example_labels' building gcc trunk on cygwin
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--- Comment #2 from Roger Orr <rogero at howzatt dot demon.co.uk> ---
Hello Richard,
PR92037 appears to be resolved in revision 276804, which precedes the first of
my failing revisions (276902).
FWIW it was still failing last night with 276968
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/91369] Implement P0784R7: constexpr new
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--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #12)
> Well, not fully. The paper has additions of constexpr keywords on the
> library side, but more importantly, we'll probably need some hacks in the
> compiler for the library side, but waiting for Jonathan with that.
Yes, I have the library parts coded up but not committed.
> My understanding is that right now (perhaps that might change) placement new
> should not be treated as constexpr function, but it needs to be in certain
> STL templates (at least std::construct_at, something else?)
The way EDG does it is not to allow placement new in constant expressions, but
to intercept calls to std::construct_at and std::destroy_at and replace them
with equivalent code that does the construction/destruction.
If allowing the body of std::construct_at to be valid is easier, that's fine
too.
> Also, I was afraid that in std::allocator<T>::allocate, the cast would be
> reinterpret_cast, but apparently it isn't:
>
> template <typename T>
> constexpr T *
> foo ()
> {
> return static_cast<T *> (::operator new (sizeof (T)));
> }
>
> constexpr int
> bar ()
> {
> auto a = foo <int> ();
> ::operator delete (a);
> return 0;
> }
>
> constexpr auto p = bar ();
>
> (this doesn't actually use placement new, because that does and should ATM
> fail). So, maybe it is just the placement new that needs to be handled.
> But, if one can cast the global replaceable allocator function result to
> anything in constexpr and our implementation triggers on the cast rather
> than on some spot coming from the new operator, shouldn't we use some new
> C++ expression kind or say an internal function as an explicit cast in new
> expression (placement or not) rather than any cast of the pointer?
Again, instead of trying to allow whatever the body of std::allocator::allocate
does, EDG just intercepts call to std::allocator<T>::allocate and replaces it
with something else that works for the constexpr case.
That means it doesn't matter what the body of std::allocator<T>::allocate does,
and it doesn't matter whether operator new has been replaced by the program,
because that code is never evaluated in constant expressions.
> Note, clang++ rejects the above testcase with
> /tmp/6.C:16:16: error: constexpr variable 'p' must be initialized by a
> constant expression
> constexpr auto p = bar ();
> ^ ~~~~~~
> /tmp/6.C:5:28: note: cannot allocate untyped memory in a constant
> expression; use 'std::allocator<T>::allocate' to allocate memory of type 'T'
> return static_cast<T *> (::operator new (sizeof (T)));
> ^
> /tmp/6.C:11:12: note: in call to 'foo()'
> auto a = foo <int> ();
> ^
> /tmp/6.C:16:20: note: in call to 'bar()'
> constexpr auto p = bar ();
> ^
> 1 error generated.
>
> Is it correct or not? The allocation function itself is not constexpr, on
> the other side the wording says that the allocations should be elided in
> constexpr contexts.
I don't think Clang implements this feature yet, so I'd expect it to fail.
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Subject: [Bug tree-optimization/92085] [10 Regression] ICE: tree check: expected class 'type', have 'exceptional' (error_mark) in useless_type_conversion_p, at gimple-expr.c:86
Date: Tue, 15 Oct 2019 07:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92085
--- Comment #5 from prathamesh3492 at gcc dot gnu.org ---
Author: prathamesh3492
Date: Tue Oct 15 07:19:41 2019
New Revision: 276984
URL: https://gcc.gnu.org/viewcvs?rev=276984&root=gcc&view=rev
Log:
2019-10-15 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
PR tree-optimization/92085
* tree-if-conv.c (ifcvt_local_dce): Call gsi_next in else clause,
instead of calling it unconditionally after
delete_dead_or_redundant_assignment and fix indentation.
testsuite/
* gcc.dg/tree-ssa/pr92085-1.c: New test.
* gcc.dg/tree-ssa/pr92085-2.c: Likewise.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr92085-1.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/pr92085-2.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-if-conv.c
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Subject: [Bug target/90723] pr88598-2.c segfaults with -msve-vector-bits%6
Date: Tue, 15 Oct 2019 07:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90723
--- Comment #3 from prathamesh3492 at gcc dot gnu.org ---
(In reply to Eric Gallager from comment #2)
> (In reply to prathamesh3492 from comment #1)
> > Author: prathamesh3492
> > Date: Sat Jul 13 08:28:33 2019
> > New Revision: 273466
> >
> > URL: https://gcc.gnu.org/viewcvs?rev=273466&root=gcc&view=rev
> > Log:
> > 2019-07-15 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
> >
> > PR target/90723
> > * recog.h (temporary_volatile_ok): New class.
> > * config/aarch64/aarch64.c (aarch64_emit_sve_pred_move): Set
> > volatile_ok temporarily to true using temporary_volatile_ok.
> > * expr.c (emit_block_move_via_cpymem): Likewise.
> > * optabs.c (maybe_legitimize_operand): Likewise.
> >
> > Modified:
> > trunk/gcc/ChangeLog
> > trunk/gcc/config/aarch64/aarch64.c
> > trunk/gcc/expr.c
> > trunk/gcc/optabs.c
> > trunk/gcc/recog.h
>
> Did this fix it?
Yes.
Thanks,
Prathamesh
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Subject: [Bug middle-end/92046] Command line options (that are per-functions) are affecting --params which are global.
Date: Tue, 15 Oct 2019 07:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92046
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Oct 15 07:28:26 2019
New Revision: 276985
URL: https://gcc.gnu.org/viewcvs?rev=276985&root=gcc&view=rev
Log:
2019-10-15 Richard Biener <rguenther@suse.de>
PR middle-end/92046
* common.opt (fallow-store-data-races): New.
* params.def (PARAM_ALLOW_STORE_DATA_RACES): Remove.
* params.h (ALLOW_STORE_DATA_RACES): Likewise.
* doc/invoke.texi (fallow-store-data-races): Document.
(--param allow-store-data-races): Remove docs.
* opts.c (default_options_table): Enable -fallow-store-data-races
at -Ofast.
(default_options_optimization): Do not enable --param
allow-store-data-races at -Ofast.
* tree-if-conv.c (ifcvt_memrefs_wont_trap): Use flag_store_data_races
instead of PARAM_ALLOW_STORE_DATA_RACES.
* tree-ssa-loop-im.c (execute_sm): Likewise.
* c-c++-common/cxxbitfields-3.c: Adjust.
* c-c++-common/cxxbitfields-6.c: Likewise.
* c-c++-common/simulate-thread/bitfields-1.c: Likewise.
* c-c++-common/simulate-thread/bitfields-2.c: Likewise.
* c-c++-common/simulate-thread/bitfields-3.c: Likewise.
* c-c++-common/simulate-thread/bitfields-4.c: Likewise.
* g++.dg/simulate-thread/bitfields-2.C: Likewise.
* g++.dg/simulate-thread/bitfields.C: Likewise.
* gcc.dg/lto/pr52097_0.c: Likewise.
* gcc.dg/simulate-thread/speculative-store-2.c: Likewise.
* gcc.dg/simulate-thread/speculative-store-3.c: Likewise.
* gcc.dg/simulate-thread/speculative-store-4.c: Likewise.
* gcc.dg/simulate-thread/speculative-store.c: Likewise.
* gcc.dg/tree-ssa/20050314-1.c: Likewise.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/common.opt
trunk/gcc/doc/invoke.texi
trunk/gcc/opts.c
trunk/gcc/params.def
trunk/gcc/params.h
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/c-c++-common/cxxbitfields-3.c
trunk/gcc/testsuite/c-c++-common/cxxbitfields-6.c
trunk/gcc/testsuite/c-c++-common/simulate-thread/bitfields-1.c
trunk/gcc/testsuite/c-c++-common/simulate-thread/bitfields-2.c
trunk/gcc/testsuite/c-c++-common/simulate-thread/bitfields-3.c
trunk/gcc/testsuite/c-c++-common/simulate-thread/bitfields-4.c
trunk/gcc/testsuite/g++.dg/simulate-thread/bitfields-2.C
trunk/gcc/testsuite/g++.dg/simulate-thread/bitfields.C
trunk/gcc/testsuite/gcc.dg/lto/pr52097_0.c
trunk/gcc/testsuite/gcc.dg/simulate-thread/speculative-store-2.c
trunk/gcc/testsuite/gcc.dg/simulate-thread/speculative-store-3.c
trunk/gcc/testsuite/gcc.dg/simulate-thread/speculative-store-4.c
trunk/gcc/testsuite/gcc.dg/simulate-thread/speculative-store.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/20050314-1.c
trunk/gcc/tree-if-conv.c
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>From gcc-bugs-return-656463-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 07:45:39 2019
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From: "mateusz.pusz at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/92101] New: Class template partial specializations with class NTTP does not work
Date: Tue, 15 Oct 2019 07:45:00 -0000
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Bug ID: 92101
Summary: Class template partial specializations with class NTTP
does not work
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mateusz.pusz at gmail dot com
Target Milestone: ---
Assuming the following basic_fixed_string implementation
```
#include <cstdlib>
template<typename CharT, std::size_t N>
struct basic_fixed_string {
CharT data_[N+1] = {};
constexpr basic_fixed_string(const CharT (&txt)[N+1]) noexcept
{
for(std::size_t i = 0; i <= N; ++i)
data_[i] = txt[i];
}
// auto operator==(const basic_fixed_string &) = default;
};
template<typename CharT, std::size_t N>
basic_fixed_string(const CharT (&str)[N]) -> basic_fixed_string<CharT, N-1>;
```
the following works:
```
template<basic_fixed_string Name, typename...>
struct A {
static constexpr auto name = Name;
};
struct B : A<"abc", int> {};
```
but the following does not work
```
template<basic_fixed_string Name, typename...>
struct A;
template<basic_fixed_string Name, typename T1>
struct A<Name, T1> {
static constexpr auto name = Name;
};
struct B : A<"abc", int> {};
```
Fails with the following error:
```
source>:26:18: error: class template argument deduction failed:
26 | struct A<Name, T1> {
| ^
<source>:26:18: error: no matching function for call to
'basic_fixed_string(basic_fixed_string<...auto...>)'
<source>:16:1: note: candidate: 'template<class CharT, long unsigned int N>
basic_fixed_string(const CharT (&)[N])-> basic_fixed_string<CharT, (N - 1)>'
16 | basic_fixed_string(const CharT (&str)[N]) -> basic_fixed_string<CharT,
N-1>;
| ^~~~~~~~~~~~~~~~~~
<source>:16:1: note: template argument deduction/substitution failed:
<source>:26:18: note: mismatched types 'const CharT [N]' and
'basic_fixed_string<...auto...>'
26 | struct A<Name, T1> {
| ^
<source>:7:15: note: candidate: 'template<class CharT, long unsigned int N>
basic_fixed_string(const CharT (&)[(N + 1)])-> basic_fixed_string<CharT, N>'
7 | constexpr basic_fixed_string(const CharT (&txt)[N+1]) noexcept
| ^~~~~~~~~~~~~~~~~~
<source>:7:15: note: template argument deduction/substitution failed:
<source>:26:18: note: mismatched types 'const CharT [(N + 1)]' and
'basic_fixed_string<...auto...>'
26 | struct A<Name, T1> {
| ^
<source>:4:8: note: candidate: 'template<class CharT, long unsigned int N>
basic_fixed_string(basic_fixed_string<CharT, N>)-> basic_fixed_string<CharT,
N>'
4 | struct basic_fixed_string {
| ^~~~~~~~~~~~~~~~~~
<source>:4:8: note: template argument deduction/substitution failed:
<source>:26:18: note: mismatched types 'basic_fixed_string<CharT, N>' and
'basic_fixed_string<...auto...>'
26 | struct A<Name, T1> {
| ^
<source>:30:12: error: invalid use of incomplete type 'struct
A<basic_fixed_string<char, 3>{"abc"}, int>'
30 | struct B : A<"abc", int> {};
| ^~~~~~~~~~~~~
<source>:23:8: note: declaration of 'struct A<basic_fixed_string<char,
3>{"abc"}, int>'
23 | struct A;
| ^
Compiler returned: 1
```
Godbolt link: https://godbolt.org/z/MCdhTJ
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Subject: [Bug target/92035] [AVX512F]Unimplemented intrinsic
Date: Tue, 15 Oct 2019 07:45:00 -0000
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Hongtao.liu <crazylht at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
Fixed in gcc10+.
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Subject: [Bug target/88918] [meta-bug] x86 intrinsic issues
Date: Tue, 15 Oct 2019 07:45:00 -0000
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Bug 88918 depends on bug 92035, which changed state.
Bug 92035 Summary: [AVX512F]Unimplemented intrinsic
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92035
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug ipa/92074] [10 regression] 26% performance regression on Spec2017 548.exchange2_r
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--- Comment #3 from Xiong Hu XS Luo <luoxhu at cn dot ibm.com> ---
(In reply to Jan Hubicka from comment #2)
> The regression is because we now inline covered into digits2:
>
> IPA function summary for digits_2/29 inlinable
> global time: 1553.078985
> self size: 1295
> global size: 1295
> min size: 0
> self stack: 261
> global stack: 261
> size:981.000000, time:1505.442572
> size:3.000000, time:1.999121, executed if:(not inlined)
> size:0.500000, time:0.500000, executed if:(not inlined), nonconst
> if:(op0[ref offset: 0] changed) && (not inlined)
> size:210.500000, time:27.456610, nonconst if:(op0[ref offset: 0]
> changed)
> size:21.000000, time:3.795164, executed if:(op0[ref offset: 0] == 5)
> size:6.000000, time:0.334389, executed if:(op0[ref offset: 0] != 8)
> size:1.000000, time:0.033237, executed if:(op0[ref offset: 0] != 8),
> nonconst if:(op0[ref offset: 0] changed) && (op0[ref offset: 0] != 8)
> size:66.000000, time:13.130882, executed if:(op0[ref offset: 0] == 8)
> loop iterations:(op0[ref offset: 0] changed)
> calls:
> digits_2/29 function not considered for inlining
> loop depth: 9 freq:0.03 size: 2 time: 11callee size:647 stack:261
> predicate: (op0[ref offset: 0] != 8)
> op0 is compile time invariant
> covered.constprop/93 function not considered for inlining
> loop depth: 9 freq:0.00 size: 4 time: 13callee size:214 stack:1472
> predicate: (op0[ref offset: 0] == 8)
> op0 is compile time invariant
> op1 is compile time invariant
>
> digits_2 is quite deeply recursive and inlining quite expensive function
> "covered" does not help.
Hi Honza,
I am analyzing the exchange2 of the recursive call digits_2(int k), this is not
relevant with current PR. Sorry for distracting.
In Fortran, k is pass by reference instead of pass by value, the new IPA-SRA
could do the SRA and convert it to pass by value with some workaround, but
ipa-sra is running after ipa-cp, and ipa-cp is not able to leverage the SRA
results in WPA stage.
As digits_2 consumes most of the run time, and the input param value increases
from 1 to 9, if manually convert the recursive call to non-recursive call like:
case(1) call digits_2_1(); ... case(9) call digits_2_9();
The performance will go up for about 60%.
So there may be possible methods to do such kind of optimization:
1. Enable profile with value range and probability, save the input param k's
value range to be [1, 9] 90%, ~[1, 9] 10%, then ipa-cp and ipa-sra could do
recursive const propagation for digits_2 to generate digits_2.constprop1,
digits_2.constprop2, etc. It would be a combined optimization of ipa-profile,
ipa-cp, ipa-sra. This would be complicated as ipa-cp doesn't support recursive
const prop and pass by reference prop with operands yet(like *(&k)+1).
2. Or use an independent pass(I am not sure whether it already exists in
current GCC) to do the recursive to non-recursive call conversion like manual
way for HOT recursive calls, then ipa-cp could do the const prop as usual.
Any suggestion about this, please? Thanks.
>
> This can be solved by --param inline-heuristics-hint-percent=600
> the current default of 1600 is way too high and I scheduled some benchmarks
> to tune it down but unfortunately our LNT benchmarking is down currently. (I
> would like to see it reduced to even lower value if polyhedron and SPEC
> testing is happy about that)
>
> Generally it would be nice if inliner understood that inlining into self
> recursive functions on the path that is not going to recursion may be
> harmful. This we do not model and thus this works/does not work sort of
> randomly.
>From gcc-bugs-return-656467-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 08:19:16 2019
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Subject: [Bug c++/71222] [concepts] ill-formed code taking the address of a function concept not rejected
Date: Tue, 15 Oct 2019 08:19:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The bug is still present on gcc-8-branch.
On gcc-9-branch there's an ICE:
71222.cc: In function 'int main()':
71222.cc:4:16: internal compiler error: in instantiate_decl, at cp/pt.c:24449
4 | auto fc = &FC<int>;
| ^~~~~~~
0x591eca instantiate_decl(tree_node*, bool, bool)
/home/jwakely/src/gcc/gcc-9/gcc/cp/pt.c:24449
With trunk it's correctly rejected:
71222.cc: In function 'int main()':
71222.cc:4:16: error: lvalue required as unary '&' operand
4 | auto fc = &FC<int>;
| ^~~~~~~
We should add the testcase (if there isn't something like it already) and close
this as FIXED.
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Subject: [Bug c++/70037] [concepts] comdat group error and an ICE with a conceptified tuple implementation
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 47038
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47038&action=edit
New testcase
I tried updating the attachment to C++2a syntax and it crashes differently:
g++ -std=gnu++20 70037.ii -Wno-deprecated-declarations -Wno-literal-suffix
70037.ii:20114:37: internal compiler error: in push_access_scope, at
cp/pt.c:233
20114 | : _Inherited(__elements...) { }
| ^
0x9a00a6 push_access_scope(tree_node*)
/home/jwakely/src/gcc/gcc/gcc/cp/pt.c:232
0x89f53d constraints_satisfied_p
/home/jwakely/src/gcc/gcc/gcc/cp/constraint.cc:2528
0x86c493 add_method(tree_node*, tree_node*, bool)
/home/jwakely/src/gcc/gcc/gcc/cp/class.c:1097
0x9f8773 finish_member_declaration(tree_node*)
/home/jwakely/src/gcc/gcc/gcc/cp/semantics.c:3275
0x98c46a cp_parser_template_declaration_after_parameters
/home/jwakely/src/gcc/gcc/gcc/cp/parser.c:28664
0x98cd8d cp_parser_explicit_template_declaration
/home/jwakely/src/gcc/gcc/gcc/cp/parser.c:28838
0x98cd8d cp_parser_template_declaration_after_export
/home/jwakely/src/gcc/gcc/gcc/cp/parser.c:28857
0x98e20d cp_parser_member_declaration
/home/jwakely/src/gcc/gcc/gcc/cp/parser.c:24583
0x9655fa cp_parser_member_specification_opt
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/home/jwakely/src/gcc/gcc/gcc/cp/parser.c:23597
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/home/jwakely/src/gcc/gcc/gcc/cp/parser.c:14203
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0x98fad9 cp_parser_declaration
/home/jwakely/src/gcc/gcc/gcc/cp/parser.c:13241
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/home/jwakely/src/gcc/gcc/gcc/cp/parser.c:13168
0x99057c cp_parser_namespace_body
/home/jwakely/src/gcc/gcc/gcc/cp/parser.c:19479
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-656469-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 08:36:48 2019
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Subject: [Bug c++/69718] [concepts] cc1plus segfault on invalid
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Jeff, the usual way would be to use dg-error to match the diagnostics and lines
where an error is expected. Something like:
typename foo(Init) requires Concept<foo> {
// { dg-error "expected nested-name" "" { *-*-* } .-1 }
// { dg-error "'Init' has not been declared" "" { *-*-* } .-2 }
The .-1 line number means one line previous, and .-2 means two lines previous.
Please send the patch to the gcc-patches mailing list, thanks!
>From gcc-bugs-return-656470-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 08:39:34 2019
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Subject: [Bug c++/68827] [concepts] ICE in fold where requires parameter shadows function argument
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This no longer gives an ICE (nor "confused by previous errors, bailing out) on
current trunk:
68827.cc: In instantiation of 'bool requires_types_args(V&&, Var<Types ...>&,
Args&& ...) [with V = A; Types = {int, char}; Args = {int, char}]':
68827.cc:23:37: required from here
68827.cc:15:10: error: 'foo' was not declared in this scope
15 | foo(v, type, args...);
| ~~~^~~~~~~~~~~~~~~~~~
68827.cc:15:10: error: 'foo' was not declared in this scope, and no
declarations were found by argument-dependent lookup at the point of
instantiation [-fpermissive]
68827.cc:11:30: warning: unused parameter 'v' [-Wunused-parameter]
11 | bool requires_types_args(V&& v, Var<Types...>&, Args&&... args)
| ~~~~^
68827.cc:11:55: warning: unused parameter 'args#0' [-Wunused-parameter]
11 | bool requires_types_args(V&& v, Var<Types...>&, Args&&... args)
| ~~~~~~^~~~~~~~
68827.cc:11:55: warning: unused parameter 'args#1' [-Wunused-parameter]
Probably fixed by the concepts-cxx2a merge.
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Subject: [Bug c++/68826] [concepts] ICE in fold expression with requires
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No ICE with current trunk:
68826.cc: In instantiation of 'bool requires_types(Types&& ...) [with Types =
{char, int, const char (&)[3]}]':
68826.cc:10:30: required from here
68826.cc:5:19: error: 'foo' was not declared in this scope
5 | requires { foo(types); });
| ~~~^~~~~~~
68826.cc:5:19: error: 'foo' was not declared in this scope, and no declarations
were found by argument-dependent lookup at the point of instantiation
[-fpermissive]
68826.cc:5:19: error: 'foo' was not declared in this scope, and no declarations
were found by argument-dependent lookup at the point of instantiation
[-fpermissive]
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Subject: [Bug c++/68628] [concepts] ICE: segmentation fault in crash_signal, toplev.c:334
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-invalid-code
Known to work| |10.0, 9.2.0
Known to fail| |8.3.0
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No ICE with gcc-9-branch or current trunk:
68628.cc:12:61: error: expected parameter pack before '...'
12 | is_convertible<Ret, decltype(impl(forward <
Args(args)...))>::value;
| ^~~
68628.cc:12:41: error: invalid template-argument-list
12 | is_convertible<Ret, decltype(impl(forward <
Args(args)...))>::value;
| ^~~~~~~
68628.cc:12:41: note: function name as the left hand operand of '<' is
ill-formed in C++2a; wrap the function name in '()'
68628.cc:12:64: error: no matching function for call to
'internal::B<Ret>::impl(void (&)())'
12 | is_convertible<Ret, decltype(impl(forward <
Args(args)...))>::value;
| ^
68628.cc:7:35: note: candidate: 'template<class> static auto
internal::A::impl()'
7 | template <typename> static auto impl();
| ^~~~
68628.cc:7:35: note: template argument deduction/substitution failed:
68628.cc:12:64: note: candidate expects 0 arguments, 1 provided
12 | is_convertible<Ret, decltype(impl(forward <
Args(args)...))>::value;
| ^
68628.cc:12:64: error: no matching function for call to
'internal::B<Ret>::impl(void (&)())'
68628.cc:7:35: note: candidate: 'template<class> static auto
internal::A::impl()'
7 | template <typename> static auto impl();
| ^~~~
68628.cc:7:35: note: template argument deduction/substitution failed:
68628.cc:12:64: note: candidate expects 0 arguments, 1 provided
12 | is_convertible<Ret, decltype(impl(forward <
Args(args)...))>::value;
| ^
68628.cc:12:66: error: template argument 2 is invalid
12 | is_convertible<Ret, decltype(impl(forward <
Args(args)...))>::value;
| ^
68628.cc: In instantiation of 'bool Invokable<<lambda()>, int>':
68628.cc:21:17: required from here
68628.cc:20:64: error: no match for call to '(internal::B<<lambda()> >) (void
(&)())'
20 | template <typename Ret, typename> bool
Invokable{invoke_as<Ret>(forward)};
|
~~~~~~~~~~~~~~^~~~~~~~~
68628.cc:11:8: note: candidate: 'auto internal::B<Ret>::operator()(F, Args ...)
requires <erroneous-expression> [with F = void (*)(); Args = {}; Ret =
<lambda()>]'
11 | auto operator()(F, Args... args) requires
| ^~~~~~~~
68628.cc:11:8: note: constraints not satisfied
68628.cc:21:56: error: expected ',' at end of input
21 | static_assert ( Invokable < decltype ( functor ), int >
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
| ,
68628.cc:21:17: error: expected string-literal at end of input
21 | static_assert ( Invokable < decltype ( functor ), int >
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
68628.cc:21:56: error: expected ')' at end of input
21 | static_assert ( Invokable < decltype ( functor ), int >
| ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
| )
68628.cc:21:56: error: expected ';' at end of input
21 | static_assert ( Invokable < decltype ( functor ), int >
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
| ;
>From gcc-bugs-return-656473-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 08:47:17 2019
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Subject: [Bug c++/68608] [concepts] ICE with explicit class instantiation
Date: Tue, 15 Oct 2019 08:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68608
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Last reconfirmed|2017-10-28 00:00:00 |2019-10-15
Known to fail| |10.0, 9.2.0
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Still ICEs on current trunk with -std=c++17 -fconcepts, and also with
-std=c++2a after modernising the code:
template <class T> concept C = true;
template <class T>
struct A {
int f() requires C<T> { return 1; }
int f() requires (!C<T>) { return 2; }
};
int main() {
return 0;
}
template struct A<int>;
68608.cc:13:23: error: Two symbols with same comdat_group are not linked by the
same_comdat_group list.
13 | template struct A<int>;
| ^
_ZN1AIiE1fEv/2 (int A<T>::f() requires !(C<T>) [with T = int]) @0x7fe58ee599d8
Type: function definition analyzed
Visibility: forced_by_abi no_reorder public weak comdat_group:_ZN1AIiE1fEv
one_only
previous sharing asm name: 1
References:
Referring:
Function flags: body
Called by:
Calls:
_ZN1AIiE1fEv/1 (int A<T>::f() requires C<T> [with T = int]) @0x7fe58ee59870
Type: function definition analyzed
Visibility: forced_by_abi no_reorder public weak comdat_group:_ZN1AIiE1fEv
one_only
next sharing asm name: 2
References:
Referring:
Function flags: body
Called by:
Calls:
68608.cc:13:23: internal compiler error: symtab_node::verify failed
0xb3ca36 symtab_node::verify_symtab_nodes()
/home/jwakely/src/gcc/gcc/gcc/symtab.c:1310
0xb4ec04 symtab_node::checking_verify_symtab_nodes()
/home/jwakely/src/gcc/gcc/gcc/cgraph.h:647
0xb4ec04 symbol_table::compile()
/home/jwakely/src/gcc/gcc/gcc/cgraphunit.c:2598
0xb512cc symbol_table::compile()
/home/jwakely/src/gcc/gcc/gcc/cgraphunit.c:2595
0xb512cc symbol_table::finalize_compilation_unit()
/home/jwakely/src/gcc/gcc/gcc/cgraphunit.c:2868
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
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Subject: [Bug c++/68429] [concepts] ICE in in placeholder_extract_concept_and_args, at cp/constraint.cc:1401
Date: Tue, 15 Oct 2019 08:51:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68429
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
ince-on-invalid-code with gcc-8-branch, accepts-invalid with gcc-9-branch,
correctly rejected with trunk using -std=c++17 -fconcepts:
68429.cc: In function 'int main()':
68429.cc:19:8: error: cannot call function 'void f(auto:1) [with auto:1 = A]'
19 | f(A());
| ^
68429.cc:14:6: note: constraints not satisfied
14 | void f(C2) {}
| ^
68429.cc: In function 'void f(auto:1) [with auto:1 = A]':
68429.cc:7:14: required for the satisfaction of 'C2<A>'
68429.cc:8:10: in requirements with 'A expr', '<typeprefixerror>x'
68429.cc:8:44: error: 'struct A' has no member named 'identity'
8 | return requires(Expr expr, decltype(expr.identity) x) {
| ~~~~~^~~~~~~~
So seems to be fixed.
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Subject: [Bug c++/68395] [concepts] segfault in valid code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68395
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Using -std=gnu++17 -fconcepts this compiles OK with GCC 7, 8 and 9. Rejected
with trunk:
bug5.cpp:72:3: warning: access declarations are deprecated in favour of
using-declarations; suggestion: add the 'using' keyword [-Wdeprecated]
72 | detail_tuple::TupleBase<std::index_sequence_for<>,
Values...>::TupleBase;
| ^~~~~~~~~~~~
bug5.cpp:84:42: warning: the address of 'void and_c() [with bool ...<anonymous>
= {}]' will never be NULL [-Waddress]
84 | constexpr bool are_equal_length_tuples = and_c<>;
| ^~~~~~~
bug5.cpp:96:11: error: 'cpt_MappableElement' does not constrain a type
96 | and_c<cpt_MappableElement<Indexes>()...>;
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
bug5.cpp:86:14: note: concept defined here
86 | concept bool cpt_MappableElement() {
| ^~~~~~~~~~~~~~~~~~~
bug5.cpp:156:1: warning: ISO C++ forbids declaration of 'main' with no type
[-Wreturn-type]
156 | main() {
| ^~~~
bug5.cpp: In instantiation of 'constexpr const bool
htl::detail_concept::mappable_elements<std::F<int, 1>, int>':
bug5.cpp:102:9: required from 'constexpr const bool
htl::detail_concept::mappable_impl<int, const
htl::Tuple<htl::integral_constant<long int, 2>, htl::integral_constant<long
int, 7> >, const htl::Tuple<htl::integral_constant<long int, 3>, long int> >'
bug5.cpp:108:26: required from here
bug5.cpp:94:16: warning: the address of 'void and_c() [with bool ...<anonymous>
= {false}]' will never be NULL [-Waddress]
94 | constexpr bool mappable_elements<std::index_sequence<Indexes...>,
Functor,
|
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
95 | TupleForwards...> =
| ~~~~~~~~~~~~~~~~~
bug5.cpp: In instantiation of 'constexpr const bool
htl::detail_concept::mappable_predicate_impl<int, const
htl::Tuple<htl::integral_constant<long int, 2>, htl::integral_constant<long
int, 7> >, const htl::Tuple<htl::integral_constant<long int, 3>, long int> >':
bug5.cpp:124:26: required from here
bug5.cpp:118:40: warning: the address of 'bool
htl::detail_concept::cpt_MappablePredicateImpl() [with <template-parameter-1-1>
= int]' will never be NULL [-Waddress]
118 | TupleForwards...>() constexpr bool
mappable_predicate_impl<Predicate,
|
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
119 |
TupleForwards...> =
|
~~~~~~~~~~~~~~~~~
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |needs-reduction
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-10-15
Ever confirmed|0 |1
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Still ICEs on current trunk with -std=gnu++17 -fconcepts
I haven't confirmed whether the code is valid, nor tried to reduce it.
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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Bug 67491 depends on bug 67178, which changed state.
Bug 67178 Summary: [concepts] ICE on self-referencing concept
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67178
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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Bug 67491 depends on bug 67147, which changed state.
Bug 67147 Summary: [concepts] ICE on checking concept with default template arguments
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67147
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug c++/67147] [concepts] ICE on checking concept with default template arguments
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Let's close it then, thanks, Andrew.
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Subject: [Bug c++/67178] [concepts] ICE on self-referencing concept
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on trunk then, thanks.
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Subject: [Bug c++/67178] [concepts] ICE on self-referencing concept
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>From gcc-bugs-return-656484-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 09:10:32 2019
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
Bug 67491 depends on bug 67210, which changed state.
Bug 67210 Summary: [concepts] Error parsing ">>" after a template-id that names a concept
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67210
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Subject: [Bug c++/67210] [concepts] Error parsing ">>" after a template-id that names a concept
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Closing as fixed then, thanks.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
Bug 67491 depends on bug 67685, which changed state.
Bug 67685 Summary: ICE on invalid requires expression
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67685
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>From gcc-bugs-return-656485-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 09:14:51 2019
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Subject: [Bug c++/67685] ICE on invalid requires expression
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed then, thanks.
(N.B. GCC trunk and Clang's experimental concepts branch accept it with a
warning about an unused expression)
>From gcc-bugs-return-656487-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 09:18:39 2019
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Subject: [Bug c++/92099] [9/10 Regression] static_assert of struct template of false_type succeed with GCC8 but not GCC9
Date: Tue, 15 Oct 2019 09:18:00 -0000
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--- Comment #1 from å™æ™… <sunxuanmailbox at 163 dot com> ---
Also tried with gcc 10.0.0 201901015 (experimental) and failed to compile.
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Subject: [Bug c++/67901] [concepts] overloading bug when considered more specialized vs more constrained
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67901
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-10-15
Ever confirmed|0 |1
>From gcc-bugs-return-656489-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 09:24:40 2019
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Subject: [Bug c++/67934] [concepts] ICE when providing default function implementations using concepts
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67934
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-invalid-code
Last reconfirmed|2015-10-12 00:00:00 |2019-10-15
Known to fail| |10.0
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Still crashes on current trunk with -std=gnu++17 -fconcepts
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Subject: [Bug c++/67934] [concepts] ICE when providing default function implementations using concepts
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Created attachment 47040
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Subject: [Bug c++/67934] [concepts] ICE when providing default function implementations using concepts
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>From gcc-bugs-return-656492-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 09:26:05 2019
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Subject: [Bug c++/67217] [concepts] Constraints are ignored when specializing union templates
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67217
Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on trunk then, thanks.
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
Bug 67491 depends on bug 67217, which changed state.
Bug 67217 Summary: [concepts] Constraints are ignored when specializing union templates
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67217
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Subject: [Bug c++/67704] [concepts] requirements not being applied to aliases
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-10-15
Ever confirmed|0 |1
Known to fail| |10.0
>From gcc-bugs-return-656495-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 09:29:34 2019
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Subject: [Bug c++/67720] [concepts] bug with recursive constrained function
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Compiles on trunk with -std=gnu++17 -fconcepts
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
Bug 67491 depends on bug 79381, which changed state.
Bug 79381 Summary: [concepts] Call to template function with type-requirement unsatisfied not rejected
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79381
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/79381] [concepts] Call to template function with type-requirement unsatisfied not rejected
Date: Tue, 15 Oct 2019 09:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79381
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think the program is valid and GCC is right to accept it.
The constraint checking doesn't need to check that the entire instantiation of
DeriveFrom<void(*)()> is valid, so doesn't check the base classes.
It also compiles if DeriveFrom is incomplete:
template<class> struct DeriveFrom;
All the constraint checks is that DeriveFrom<T> is a type, which doesn't
require it to be complete or able to be instantiated.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/81270] [concepts] ill-formed code with a constrained variable declaration with multiple declarators with different deduced types not rejected
Date: Tue, 15 Oct 2019 09:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81270
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-10-15
Ever confirmed|0 |1
Known to fail| |10.0
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Still accepted by current trunk.
Also accepted when modernised to C++2a syntax:
template<typename> concept C = true;
C auto v1 = 1, v2 = nullptr; // Ill-formed.
// Following code to demonstrate that the types of v1 and v2 are deduced
// to different types.
template<typename, typename> struct is_same {
static constexpr bool value = false;
};
template<typename T> struct is_same<T,T> {
static constexpr bool value = true;
};
static_assert(is_same<decltype(v1),int>::value);
static_assert(is_same<decltype(v2),decltype(nullptr)>::value);
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Subject: [Bug c++/92102] New: identical requires-expression not subsumed
Date: Tue, 15 Oct 2019 09:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92102
Bug ID: 92102
Summary: identical requires-expression not subsumed
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c++
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This fails to compile with -std=gnu++2a:
template<typename T, typename U> constexpr bool same = false;
template<typename T> constexpr bool same<T, T> = true;
template<typename T, typename U>
concept same_same = same<T, U> && same<U, T>;
template<typename T>
struct traits { using type = T; };
struct tag { };
template<typename T>
struct category
{ };
template<typename T>
requires requires { typename traits<T>::type; }
struct category<T>
{ };
template<typename T>
requires requires { typename traits<T>::type; }
&& same_same<typename traits<T>::type, tag>
struct category<T>
{ using type = int; };
category<tag>::type t;
ambig.cc:27:14: error: ambiguous template instantiation for 'struct
category<tag>'
27 | category<tag>::type t;
| ^~
ambig.cc:18:10: note: candidates are: 'template<class T> requires
requires{typename traits<T>::type;} struct category<T> [with T = tag]'
18 | struct category<T>
| ^~~~~~~~~~~
ambig.cc:24:10: note: 'template<class T> requires
requires{typename traits<T>::type;} && (same_same<typename traits::type, tag>)
struct category<T> [with T = tag]'
24 | struct category<T>
| ^~~~~~~~~~~
ambig.cc:27:16: error: invalid use of incomplete type 'struct category<tag>'
27 | category<tag>::type t;
| ^~~~
ambig.cc:13:10: note: declaration of 'struct category<tag>'
13 | struct category
| ^~~~~~~~
It compiles OK if the subsumed constraint is a concept instead of a
requires-expression, even though that should be equivalent:
template<typename T, typename U> constexpr bool same = false;
template<typename T> constexpr bool same<T, T> = true;
template<typename T, typename U>
concept same_same = same<T, U> && same<U, T>;
template<typename T>
struct traits { using type = T; };
template<typename T>
concept traitsy = requires { typename traits<T>::type; };
struct tag { };
template<typename T>
struct category
{ };
template<typename T>
requires traitsy<T>
struct category<T>
{ };
template<typename T>
requires traitsy<T>
&& same_same<typename traits<T>::type, tag>
struct category<T>
{ using type = int; };
category<tag>::type t;
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
[Bug 67491] [meta-bug] concepts issues
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/92094] ice in vect_transform_stmt at tree-vect-stmts.c:10921
Date: Tue, 15 Oct 2019 10:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92094
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Oct 15 10:09:10 2019
New Revision: 276987
URL: https://gcc.gnu.org/viewcvs?rev=276987&root=gcc&view=rev
Log:
2019-10-15 Richard Biener <rguenther@suse.de>
PR tree-optimization/92094
* tree-vect-loop.c (vectorizable_reduction): For nested cycles
do not adjust the reduction definition def type.
* tree-vect-stmts.c (vect_transform_stmt): Verify the scalar stmt
defines the latch argument of the PHI.
* gfortran.dg/pr92094.f90: New testcase.
Added:
trunk/gcc/testsuite/gfortran.dg/pr92094.f90
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vect-loop.c
trunk/gcc/tree-vect-stmts.c
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Subject: [Bug fortran/92094] ice in vect_transform_stmt at tree-vect-stmts.c:10921
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92094
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug fortran/92065] [7/8/9/10 Regression] internal compiler error: in expand_expr_real_1
Date: Tue, 15 Oct 2019 10:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92065
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think I saw this elswhere.
10088 /* Variables inherited from containing functions should have
10089 been lowered by this point. */
10090 if (exp)
10091 context = decl_function_context (exp);
10092 gcc_assert (!exp
10093 || SCOPE_FILE_SCOPE_P (context)
10094 || context == current_function_decl
10095 || TREE_STATIC (exp)
10096 || DECL_EXTERNAL (exp)
(gdb) p context
$1 = <function_decl 0x7ffff6644b00 fun1>
(gdb) p current_function_decl
$2 = <function_decl 0x7ffff6644a00 fun2>
and 'exp' is the 'this' PARM_DECL. Looks like we have the "wrong" one
(or just one?). Maybe you have a single backend-decl for 'this' per
structure type? You need a distinct PARM_DECL for each function.
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Subject: [Bug target/92048] [10 regression] armeb regression after r276645
Date: Tue, 15 Oct 2019 10:44:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-10-15
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Wonder how this just made a difference on armeb ... we probably now unroll the
inner loop. On x86 we then vectorize the outer loop just fine.
Ah, when unrolled appearantly we run into
fast-math-vect-pr29925.c:16:20: missed: not vectorized: unsupported unaligned
load: *_31
since we didn't unroll in the past just disabling unrolling for the testcase is
the way to go.
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Subject: [Bug target/92048] [10 regression] armeb regression after r276645
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Oct 15 10:47:48 2019
New Revision: 276991
URL: https://gcc.gnu.org/viewcvs?rev=276991&root=gcc&view=rev
Log:
2019-10-15 Richard Biener <rguenther@suse.de>
PR testsuite/92048
* gcc.dg/vect/fast-math-vect-pr29925.c: Avoid unrolling of
inner loop.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/vect/fast-math-vect-pr29925.c
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Subject: [Bug tree-optimization/91975] worse code for small array copy using pointer arithmetic than array indexing
Date: Tue, 15 Oct 2019 10:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91975
Bug 91975 depends on bug 92048, which changed state.
Bug 92048 Summary: [10 regression] armeb regression after r276645
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92048
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug target/92048] [10 regression] armeb regression after r276645
Date: Tue, 15 Oct 2019 10:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92048
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
FIxed.
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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++/92102] identical requires-expression not subsumed
Date: Tue, 15 Oct 2019 10:55:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-10-15
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:
template<typename>
concept nope = false;
template<typename>
concept sure_thing = true;
template<typename T>
struct category
{ };
template<typename T> requires (!nope<T>)
struct category<T>
{ };
template<typename T> requires (!nope<T>) && sure_thing<T>
struct category<T>
{ using type = T; };
category<int>::type t;
ambig.cc:19:14: error: ambiguous template instantiation for 'struct
category<int>'
19 | category<int>::type t;
| ^~
ambig.cc:12:10: note: candidates are: 'template<class T> requires !(nope<T>)
struct category<T> [with T = int]'
12 | struct category<T>
| ^~~~~~~~~~~
ambig.cc:16:10: note: 'template<class T> requires !(nope<T>)
&& (sure_thing<T>) struct category<T> [with T = int]'
16 | struct category<T>
| ^~~~~~~~~~~
ambig.cc:19:16: error: invalid use of incomplete type 'struct category<int>'
19 | category<int>::type t;
| ^~~~
ambig.cc:8:10: note: declaration of 'struct category<int>'
8 | struct category
| ^~~~~~~~
To make subsumption of (!E) work I need to add a concept for !E
template<typename T>
concept nope_nope = !nope<T>;
and then use that:
template<typename T> requires nope_nope<T>
struct category<T>
{ };
template<typename T> requires nope_nope<T> && sure_thing<T>
struct category<T>
{ using type = T; };
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Subject: [Bug libgomp/92081] FAIL: libgomp.fortran/target-simd.f90 execution test
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John David Anglin <danglin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #4 from John David Anglin <danglin at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug debug/91929] missing inline subroutine information in build using sin/cos
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91929
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Known to work| |10.0
Resolution|--- |FIXED
--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91929
--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Oct 15 11:47:27 2019
New Revision: 276993
URL: https://gcc.gnu.org/viewcvs?rev=276993&root=gcc&view=rev
Log:
2019-10-15 Richard Biener <rguenther@suse.de>
PR tree-optimization/91929
* tree-ssa-pre.c (pre_expr_d::loc): New member.
(get_or_alloc_expr_for_name): Initialize it.
(get_or_alloc_expr_for_constant): Likewise.
(phi_translate_1): Copy it.
(create_expression_by_pieces): Use the original location
of the expression for the inserted stmt.
(compute_avail): Record the location of the stmt for the
expressions created.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-ssa-pre.c
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Subject: [Bug c++/67491] [meta-bug] concepts issues
Date: Tue, 15 Oct 2019 11:53:00 -0000
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Bug 67491 depends on bug 89301, which changed state.
Bug 89301 Summary: [concepts] requires clause on a template alias is ignored
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89301
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |DUPLICATE
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Subject: [Bug c++/67704] [concepts] requirements not being applied to aliases
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |antoshkka at gmail dot com
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 89301 has been marked as a duplicate of this bug. ***
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Subject: [Bug c++/89301] [concepts] requires clause on a template alias is ignored
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is a dup of an older bug.
*** This bug has been marked as a duplicate of bug 67704 ***
>From gcc-bugs-return-656514-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 11:53:46 2019
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Subject: [Bug c++/67704] [concepts] requirements not being applied to aliases
Date: Tue, 15 Oct 2019 11:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67704
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
From Bug 89301:
The following code compiles however it should not:
template<bool condition, typename T = void>
requires(condition)
using enable_if_t = T;
template<typename T, typename = enable_if_t<sizeof(T) < 0>>
void foo();
void test() {
foo<int>();
}
Slightly changed example also compiles on GCC (but fails to compile on Clang):
template<bool condition, typename T = void>
requires(condition)
using enable_if_t = T;
template<typename T>
enable_if_t<sizeof(T) < 0> foo();
void test() {
foo<int>();
}
>From gcc-bugs-return-656515-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 12:02:36 2019
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Subject: [Bug c++/81043] [concepts] partially specializing on differing constraints gives cryptic error
Date: Tue, 15 Oct 2019 12:02:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Last reconfirmed|2019-08-12 00:00:00 |2019-10-15
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Trunk now says:
81043.cc:5:24: error: 'A<T>' does not match original declaration
5 | template <C1 T> struct A<T>;
| ^~~~
81043.cc:3:30: note: original template declaration here
3 | template <typename T> struct A;
| ^
That's not much better.
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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Bug 67491 depends on bug 92089, which changed state.
Bug 92089 Summary: [concepts] requires-expression results in hard error during constraint checking
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92089
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
.
*** This bug has been marked as a duplicate of bug 78173 ***
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Subject: [Bug c++/78173] Hard error subtracting pointers to incomplete type in SFINAE context
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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CC| |redi at gcc dot gnu.org
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 92089 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-656519-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 12:09:24 2019
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Subject: [Bug c++/92103] New: constraints not checked on nested class template
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92103
Bug ID: 92103
Summary: constraints not checked on nested class template
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Blocks: 67491
Target Milestone: ---
template<typename T>
struct traits
{
template<typename U>
struct nested
{ using type = void; };
template<typename U> requires requires { typename U::type; }
struct nested<U>
{ using type = typename U::type; };
};
using V = traits<char>::nested<int>::type;
Fails to compile with -std=gnu++2a
nest.cc: In instantiation of 'struct traits<char>::nested<int>':
nest.cc:13:35: required from here
nest.cc:10:13: error: 'int' is not a class, struct, or union type
10 | { using type = typename U::type; };
| ^~~~
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
[Bug 67491] [meta-bug] concepts issues
>From gcc-bugs-return-656520-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 12:13:15 2019
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Subject: [Bug c++/92103] constraints not checked on nested class template
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The workaround is to put all constrained class templates at namespace scope.
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Subject: [Bug testsuite/92093] New test case gcc.target/powerpc/pr91275.c from r276410 fails on BE
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-10-15
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--- Comment #1 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Confirmed, mine.
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Subject: [Bug testsuite/92093] New test case gcc.target/powerpc/pr91275.c from r276410 fails on BE
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--- Comment #2 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Author: wschmidt
Date: Tue Oct 15 12:44:25 2019
New Revision: 276999
URL: https://gcc.gnu.org/viewcvs?rev=276999&root=gcc&view=rev
Log:
2019-10-15 Bill Schmidt <wschmidt@linux.ibm.com>
PR target/92093
* gcc.target/powerpc/pr91275.c: Fix type and endian issues.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/powerpc/pr91275.c
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Subject: [Bug testsuite/92093] New test case gcc.target/powerpc/pr91275.c from r276410 fails on BE
Date: Tue, 15 Oct 2019 12:54:00 -0000
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |10.0
Known to fail| |7.4.0, 8.3.0, 9.1.0
--- Comment #3 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Backports still needed, will do those later this week.
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Subject: [Bug c++/92104] New: __builtin_has_attribute in templates
Date: Tue, 15 Oct 2019 13:06:00 -0000
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Bug ID: 92104
Summary: __builtin_has_attribute in templates
Product: gcc
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The __builtin_has_attribute implementation in the C++ FE seems to be incorrect,
usually the C++ FE when parsing while processing_template_decl checks if the
corresponding types are dependent or expressions type (or value, depending on
case) dependent, if yes, builds some tree or whatever form that can be
evaluated again during instantiation, otherwise can handle it normally. In
some cases, it is handled normally when processing_template_decl and
non-dependent, but then the results are ignored and it is repeated during
instantiation.
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Subject: [Bug c++/92104] __builtin_has_attribute in templates
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Testcase could be e.g.
template <typename T>
bool
has_packed ()
{
return __builtin_has_attribute (T (), packed);
}
struct __attribute__((packed)) S { char a, b, c, d; };
bool p = has_packed<S> ();
or similar.
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/92088] aggregates with VLAs and nested functions are broken
Date: Tue, 15 Oct 2019 13:19:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 47041
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47041&action=edit
patch for the inliner
void foo(int n)
{
struct X { int a[n]; } y;
inline struct X __attribute__((always_inline)) baz (struct X x)
{
x.a[0] = 1;
return x;
}
y.a[0] = 0;
y = baz(y);
if (y.a[0] != 1)
__builtin_abort ();
}
doesn't require any other middle-end fixes but straight runs into the inliner
deficiency. Note that we don't use DECL_BY_REFERENCE here so the ABI for
passing this might be a bit odd (or not properly defined at all - we're
dealing with nested functions anyway).
Anyhow - attached is a patc^Whack for the inliner. We then inline this as
struct X xD.1985 [value-expr: *_52];
...
_52 = __builtin_alloca_with_align (_48, 32);
_53 = __builtin_memcpy (_52, y.1_46, _48);
but we obviously lack building a stack_save/restore pair around inlinings
of alloca-calling functions (or such param setup).
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Subject: [Bug c++/82019] [concepts] ICE if concept is not satisfied
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--- Comment #2 from Antony Polukhin <antoshkka at gmail dot com> ---
Updated version of the test (works well on GCC 10):
// { dg-options "-std=c++2a" }
template <class T, class Data>
concept VectorOperations = requires(T& v, const Data& data) {
v += data;
requires __is_same_as(T&, decltype(v += data));
};
template <class Container, class Data>
requires VectorOperations<Container, Data>
void compute_vector_optimal(Container& , const Data& ) {}
int main() {
unsigned v1[] = {1,2,3};
compute_vector_optimal(v1, v1); // { dg-error "cannot call function" }
}
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Subject: [Bug fortran/65438] Unnecessary ptr check
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--- Comment #9 from Tobias Burnus <burnus at gcc dot gnu.org> ---
Author: burnus
Date: Tue Oct 15 14:13:01 2019
New Revision: 277000
URL: https://gcc.gnu.org/viewcvs?rev=277000&root=gcc&view=rev
Log:
[Fortran] OpenMP+OpenACC: Remove bogus contigous-pointer check
gcc/fortran
PR fortran/65438
* openmp.c (check_array_not_assumed): Remove pointer check.
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/openmp.c
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Subject: [Bug fortran/65438] Unnecessary ptr check
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Tobias Burnus <burnus at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #10 from Tobias Burnus <burnus at gcc dot gnu.org> ---
FIXED.
For the background, see discussion at:
https://gcc.gnu.org/ml/gcc-patches/2019-10/msg01056.html
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Subject: [Bug fortran/81827] Large compile time with derived-type rrays
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--- Comment #23 from Luke Robison <robison at arlut dot utexas.edu> ---
(In reply to Luke Robison from comment #22)
> (In reply to Luke Robison from comment #21)
> > (1) Changing some or all of the "type(levelNN)" definitions to
> > "class(levelNN)" definitions
> > (2) Changing from "allocatable" to "pointer"
> >
>
> Although these work-arounds seem sufficient for this test case, they did not
> alleviate the problem in the original program. We are still unable to use
> recent gfortran versions on our main codebase due to this error.
>
>
> Luke
Correction: I found an additional few declarations which I had not converted.
The work-around I describe above does reduce compile time to a feasible (yet
still slow) level. Compiling with -O3 is substantially slower than -O0,
despite my module containing only type declarations (no procedures).
>From gcc-bugs-return-656532-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 14:50:49 2019
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Subject: [Bug c++/92105] [7/8/9/10 Regression] decltype(decltype(decltype)) prints exponential number of fix-it hints
Date: Tue, 15 Oct 2019 14:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92105
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-10-15
Known to work| |6.5.0
Ever confirmed|0 |1
Known to fail| |10.0, 7.4.0, 8.3.0, 9.2.0
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
For that last example GCC 6 prints simply:
dt.cc:1:10: error: expected primary-expression before 'decltype'
decltype(decltype(decltype(decltype(decltype(decltype(decltype(decltype(decltype(decltype)))))))))
x = 42;
^~~~~~~~
dt.cc:1:10: error: expected ')' before 'decltype'
dt.cc:1:1: error: expected unqualified-id before 'decltype'
decltype(decltype(decltype(decltype(decltype(decltype(decltype(decltype(decltype(decltype)))))))))
x = 42;
^~~~~~~~
>From gcc-bugs-return-656531-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 14:50:02 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/92105] New: [7/8/9/10 Regression] decltype(decltype(decltype)) prints exponential number of fix-it hints
Date: Tue, 15 Oct 2019 14:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92105
Bug ID: 92105
Summary: [7/8/9/10 Regression] decltype(decltype(decltype))
prints exponential number of fix-it hints
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Keywords: diagnostic
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Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
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decltype(decltype) x = 42;
prints:
dt.cc:1:10: error: expected primary-expression before 'decltype'
1 | decltype(decltype) x = 42;
| ^~~~~~~~
dt.cc:1:10: error: expected ')' before 'decltype'
1 | decltype(decltype) x = 42;
| ~^~~~~~~~
| )
dt.cc:1:10: error: expected primary-expression before 'decltype'
1 | decltype(decltype) x = 42;
| ^~~~~~~~
dt.cc:1:10: error: expected primary-expression before 'decltype'
dt.cc:1:10: error: expected primary-expression before 'decltype'
dt.cc:1:10: error: expected primary-expression before 'decltype'
dt.cc:1:1: error: expected unqualified-id before 'decltype'
1 | decltype(decltype) x = 42;
| ^~~~~~~~
but with an extra (decltype) it prints:
dt.cc:1:19: error: expected primary-expression before 'decltype'
1 | decltype(decltype(decltype)) x = 42;
| ^~~~~~~~
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:10: error: expected primary-expression before 'decltype'
1 | decltype(decltype(decltype)) x = 42;
| ^~~~~~~~
dt.cc:1:10: error: expected ')' before 'decltype'
1 | decltype(decltype(decltype)) x = 42;
| ~^~~~~~~~
| )
dt.cc:1:19: error: expected primary-expression before 'decltype'
1 | decltype(decltype(decltype)) x = 42;
| ^~~~~~~~
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:10: error: expected primary-expression before 'decltype'
1 | decltype(decltype(decltype)) x = 42;
| ^~~~~~~~
dt.cc:1:19: error: expected primary-expression before 'decltype'
1 | decltype(decltype(decltype)) x = 42;
| ^~~~~~~~
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:10: error: expected primary-expression before 'decltype'
1 | decltype(decltype(decltype)) x = 42;
| ^~~~~~~~
dt.cc:1:19: error: expected primary-expression before 'decltype'
1 | decltype(decltype(decltype)) x = 42;
| ^~~~~~~~
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:10: error: expected primary-expression before 'decltype'
1 | decltype(decltype(decltype)) x = 42;
| ^~~~~~~~
dt.cc:1:19: error: expected primary-expression before 'decltype'
1 | decltype(decltype(decltype)) x = 42;
| ^~~~~~~~
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:19: error: expected primary-expression before 'decltype'
dt.cc:1:10: error: expected primary-expression before 'decltype'
1 | decltype(decltype(decltype)) x = 42;
| ^~~~~~~~
dt.cc:1:1: error: expected unqualified-id before 'decltype'
1 | decltype(decltype(decltype)) x = 42;
| ^~~~~~~~
Add another (decltype) and you get 272 lines. Another gives 1342, then 6722,
and so on to 4 millions lines for:
decltype(decltype(decltype(decltype(decltype(decltype(decltype(decltype(decltype(decltype)))))))))
x = 42;
>From gcc-bugs-return-656533-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 15:06:05 2019
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Subject: [Bug c++/88335] Implement P1073R3, C++20 immediate functions (consteval).
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--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47042
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47042&action=edit
gcc10-pr88335.patch
Untested patch.
>From gcc-bugs-return-656534-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 15:51:35 2019
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Subject: [Bug c++/86009] [Concepts] Placeholder as argument to partial-concept-id forms extra constrained parameters
Date: Tue, 15 Oct 2019 15:51:00 -0000
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--- Comment #2 from Hubert Tong <hstong at ca dot ibm.com> ---
After adding "auto" for "Concept auto":
template <typename T, typename U> concept C0 = true;
template <typename T> concept C1 = true;
void f(C0<C1 auto> auto *) { }
template void f<wchar_t, short>(wchar_t *);
We now get:
<source>:5:15: error: template-id 'f<wchar_t, short int>' for 'void
f(wchar_t*)' does not match any template declaration
<source>:3:6: note: candidate is: 'template<class auto:1, class auto:2>
requires (C1<auto:1>) && (C0<auto:2, auto:1>) void f(auto:2*)'
So, we no longer get extra parameters, just the parameters in the reverse order
of "the order of appearance".
The issue being described by this bug report is fixed, and the remaining case
is likely to be invalid anyway. The wording that allows the `C1 auto`
placeholder is likely a wording mistake in the context of C++2a.
>From gcc-bugs-return-656535-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 15:54:49 2019
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Subject: [Bug c++/92106] New: ICE with structured bindings and -Wreturn-local-addr
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Bug ID: 92106
Summary: ICE with structured bindings and -Wreturn-local-addr
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template <typename> struct B;
template <typename _Tp> struct B<_Tp *> { typedef _Tp reference; };
struct C {
template <typename _Up> using rebind = _Up *;
};
template <typename _Iterator, typename> class D {
public:
typename B<_Iterator>::reference operator*();
void operator++();
};
template <typename _Iterator, typename _Container>
bool operator!=(D<_Iterator, _Container>, D<_Iterator, _Container>);
template <typename _Tp> class F {
public:
typedef _Tp value_type;
};
template <typename _Alloc> struct G {
template <typename _Tp> struct H { using type = C::rebind<_Tp>; };
using const_pointer = typename H<typename _Alloc::value_type>::type;
};
template <typename _Tp, typename _Alloc = F<_Tp>> class I {
typedef D<typename G<_Alloc>::const_pointer, int> const_iterator;
public:
const_iterator begin();
const_iterator end();
};
struct A {
struct J {
int name;
int value;
};
I<J> members;
template <typename Key> const int *find(Key) {
for (const auto &[name, value] : members)
return &value;
}
};
int main() {
A a;
a.find("");
}
$ ./cc1plus -quiet -std=c++17 ice.C
ice.C: In instantiation of ‘const int* A::find(Key) [with Key = const char*]’:
ice.C:44:12: required from here
ice.C:39:15: internal compiler error: Segmentation fault
39 | return &value;
| ^~~~~
0x1459c14 crash_signal
/home/marek/src/gcc/gcc/toplev.c:326
0x7f5bd2bc8ebf ???
/usr/src/debug/glibc-2.29-32-g6d8eaf4a25/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0x916ac2 cp_fold_maybe_rvalue(tree_node*, bool)
/home/marek/src/gcc/gcc/cp/cp-gimplify.c:2192
0x916da7 c_fully_fold(tree_node*, bool, bool*, bool)
/home/marek/src/gcc/gcc/cp/cp-gimplify.c:2261
0x9c9167 fold_for_warn(tree_node*)
/home/marek/src/gcc/gcc/cp/expr.c:401
0xbd86fe maybe_warn_about_returning_address_of_local
/home/marek/src/gcc/gcc/cp/typeck.c:9278
0xbd8d3b maybe_warn_about_returning_address_of_local
/home/marek/src/gcc/gcc/cp/typeck.c:9359
0xbdb84a check_return_expr(tree_node*, bool*)
/home/marek/src/gcc/gcc/cp/typeck.c:9872
0xb5da8e finish_return_stmt(tree_node*)
/home/marek/src/gcc/gcc/cp/semantics.c:952
0xb09e7a tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/marek/src/gcc/gcc/cp/pt.c:17400
0xb0bc6a tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/marek/src/gcc/gcc/cp/pt.c:17602
0xb0c832 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/marek/src/gcc/gcc/cp/pt.c:17692
0xb30012 instantiate_decl(tree_node*, bool, bool)
/home/marek/src/gcc/gcc/cp/pt.c:25178
0xb309cf instantiate_pending_templates(int)
/home/marek/src/gcc/gcc/cp/pt.c:25294
0x9a11bf c_parse_final_cleanups()
/home/marek/src/gcc/gcc/cp/decl2.c:4841
0xc700b4 c_common_parse_file()
/home/marek/src/gcc/gcc/c-family/c-opts.c:1201
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-656537-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 15:55:31 2019
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Subject: [Bug rtl-optimization/92007] [9/10 Regression] ICE: verify_flow_info failed (error: EH edge crosses section boundary in bb 7)
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--- Comment #9 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Ilya Leoshkevich from comment #7)
> Having eliminated bb 5, we cannot avoid making bb 6 cold, since this
> would violate CFG integrity: as far as I understand, it's important to
> maintain the property that cold bbs cannot dominate hot bbs.
But we can make bb 11 HOT, instead?
Question is how to figure out which to do when.
>From gcc-bugs-return-656536-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 15:55:16 2019
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Subject: [Bug c++/92106] ICE with structured bindings and -Wreturn-local-addr
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r265041.
>From gcc-bugs-return-656538-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 15:55:41 2019
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Subject: [Bug c++/92106] [8/9/10 Regression] ICE with structured bindings and -Wreturn-local-addr
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.4
Summary|ICE with structured |[8/9/10 Regression] ICE
|bindings and |with structured bindings
|-Wreturn-local-addr |and -Wreturn-local-addr
>From gcc-bugs-return-656539-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 15:59:34 2019
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Subject: [Bug c++/92106] [8/9/10 Regression] ICE with structured bindings and -Wreturn-local-addr
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-10-15
Ever confirmed|0 |1
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
9351 /* When returning address of a structured binding, if the
structured
9352 binding is not a reference, continue normally, if it is a
9353 reference, recurse on the initializer of the structured
9354 binding. */
9355 tree base = DECL_DECOMP_BASE (whats_returned);
9356 if (TYPE_REF_P (TREE_TYPE (base)))
9357 {
9358 tree init = DECL_INITIAL (base);
9359 return maybe_warn_about_returning_address_of_local (init);
9360 }
init is null here and cp_fold crashes on that.
>From gcc-bugs-return-656540-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 16:08:42 2019
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Subject: [Bug c++/92106] [8/9/10 Regression] ICE with structured bindings and -Wreturn-local-addr
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
>From gcc-bugs-return-656541-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 16:15:39 2019
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Subject: [Bug target/90723] pr88598-2.c segfaults with -msve-vector-bits%6
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to prathamesh3492 from comment #3)
> (In reply to Eric Gallager from comment #2)
> > (In reply to prathamesh3492 from comment #1)
> > > Author: prathamesh3492
> > > Date: Sat Jul 13 08:28:33 2019
> > > New Revision: 273466
> > >
> > > URL: https://gcc.gnu.org/viewcvs?rev=273466&root=gcc&view=rev
> > > Log:
> > > 2019-07-15 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
> > >
> > > PR target/90723
> > > * recog.h (temporary_volatile_ok): New class.
> > > * config/aarch64/aarch64.c (aarch64_emit_sve_pred_move): Set
> > > volatile_ok temporarily to true using temporary_volatile_ok.
> > > * expr.c (emit_block_move_via_cpymem): Likewise.
> > > * optabs.c (maybe_legitimize_operand): Likewise.
> > >
> > > Modified:
> > > trunk/gcc/ChangeLog
> > > trunk/gcc/config/aarch64/aarch64.c
> > > trunk/gcc/expr.c
> > > trunk/gcc/optabs.c
> > > trunk/gcc/recog.h
> >
> > Did this fix it?
> Yes.
>
> Thanks,
> Prathamesh
Ok, thanks, closing then
>From gcc-bugs-return-656542-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 16:26:26 2019
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/92106] [8/9/10 Regression] ICE with structured bindings and -Wreturn-local-addr
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #2)
> 9351 /* When returning address of a structured binding, if the
> structured
> 9352 binding is not a reference, continue normally, if it is a
> 9353 reference, recurse on the initializer of the structured
> 9354 binding. */
> 9355 tree base = DECL_DECOMP_BASE (whats_returned);
> 9356 if (TYPE_REF_P (TREE_TYPE (base)))
> 9357 {
> 9358 tree init = DECL_INITIAL (base);
> 9359 return maybe_warn_about_returning_address_of_local
> (init);
> 9360 }
>
> init is null here and cp_fold crashes on that.
I'd add
&& DECL_INITIAL (base)
to line 9356.
Maybe it would be better to add return nullptr;
to find if the range for loop has no iterations.
>From gcc-bugs-return-656543-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 16:34:48 2019
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Subject: [Bug c++/92106] [8/9/10 Regression] ICE with structured bindings and -Wreturn-local-addr
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--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #3)
> (In reply to Marek Polacek from comment #2)
> > 9351 /* When returning address of a structured binding, if the
> > structured
> > 9352 binding is not a reference, continue normally, if it is a
> > 9353 reference, recurse on the initializer of the structured
> > 9354 binding. */
> > 9355 tree base = DECL_DECOMP_BASE (whats_returned);
> > 9356 if (TYPE_REF_P (TREE_TYPE (base)))
> > 9357 {
> > 9358 tree init = DECL_INITIAL (base);
> > 9359 return maybe_warn_about_returning_address_of_local
> > (init);
> > 9360 }
> >
> > init is null here and cp_fold crashes on that.
>
> I'd add
> && DECL_INITIAL (base)
> to line 9356.
I'm testing the below -- wanted to lose the { }s and avoid using DECL_INITIAL
twice.
--- a/gcc/cp/typeck.c
+++ b/gcc/cp/typeck.c
@@ -9353,11 +9353,10 @@ maybe_warn_about_returning_address_of_local (tree
retval)
reference, recurse on the initializer of the structured
binding. */
tree base = DECL_DECOMP_BASE (whats_returned);
- if (TYPE_REF_P (TREE_TYPE (base)))
- {
- tree init = DECL_INITIAL (base);
- return maybe_warn_about_returning_address_of_local (init);
- }
+ tree init;
+ if (TYPE_REF_P (TREE_TYPE (base))
+ && (init = DECL_INITIAL (base)))
+ return maybe_warn_about_returning_address_of_local (init);
}
bool w = false;
auto_diagnostic_group d;
> Maybe it would be better to add return nullptr;
> to find if the range for loop has no iterations.
Added -- it's not relevant to this bug.
>From gcc-bugs-return-656544-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 16:38:32 2019
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92106
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #4)
> + tree init;
> + if (TYPE_REF_P (TREE_TYPE (base))
> + && (init = DECL_INITIAL (base)))
> + return maybe_warn_about_returning_address_of_local (init);
Then please use
if (TYPE_REF_P (TREE_TYPE (base))
if (tree init = DECL_INITIAL (base))
return ...;
instead.
>From gcc-bugs-return-656545-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 16:58:52 2019
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Subject: [Bug c++/92099] [9/10 Regression] static_assert of struct template of false_type succeed with GCC8 but not GCC9
Date: Tue, 15 Oct 2019 16:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92099
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-10-15
CC| |mpolacek at gcc dot gnu.org
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--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Seems to have started with r265789.
>From gcc-bugs-return-656546-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 17:26:58 2019
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From: "tom at honermann dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/71125] [concepts] Spurious 'invalid reference to function concept error' issued when overloads are not all declared with the concept specifier
Date: Tue, 15 Oct 2019 17:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71125
--- Comment #5 from Tom Honermann <tom at honermann dot net> ---
(In reply to Andrew Sutton from comment #3)
> Function concepts have some parsing issues related to TS-style terse
> notation, overloading and variadic templates. In particular, there are
> places where writing C<T> forms a (possibly) syntactically valid placeholder
> C<?, T> as part of a functional cast expression, which leads to the error
> you're seeing: you're incompletely instantiating a template-id that resolved
> to the template with two parameters.
I was going to argue that that explanation didn't explain why the reported
diagnostic doesn't occur when the order of the overload declarations are
swapped. However, I did a quick test and found that, indeed, the diagnostic is
not issued for the swapped case in gcc 6.1.0, but is in gcc 6.3, 7.1, and
later. It seems the lack of a diagnostic in that case was some other issue
that has since been fixed.
(In reply to Jonathan Wakely from comment #4)
> I think the "conflicts with a previous declaration" diagnostic is
> reasonable. Maybe "redeclared as a different kind of symbol" would also work.
I agree the diagnostics for the C++20 case are appropriate. I don't have an
opinion on whether it is worth trying to improve them further.
> I'll recategorise it as a diagnostic enhancement and confirm it, but I think
> closing it would also be fine.
As the original reported, I'm ok with this being closed since the original
issue isn't relevant for C++20 concepts. I don't recall the situation that
caused me to trip over this issue in the first place. I suspect I was just
playing around with the interaction between constexpr and concept functions.
>From gcc-bugs-return-656547-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 18:06:38 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/92099] [9/10 Regression] static_assert of struct template of false_type succeed with GCC8 but not GCC9
Date: Tue, 15 Oct 2019 18:06:00 -0000
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--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Reduced:
template <typename _Tp, _Tp __v> struct A { static constexpr _Tp value = __v;
};
typedef A<bool, false> false_type;
template <typename> struct DependentFalse : false_type {};
enum class E;
template <E id> void fn1() {
static_assert(DependentFalse<decltype(id)>::value);
}
>From gcc-bugs-return-656548-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 18:22:15 2019
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From: "meissner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/92107] New: GCC's insn attribute arithmetic does not follow C rules
Date: Tue, 15 Oct 2019 18:22:00 -0000
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Bug ID: 92107
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rules
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I was trying to adjust the length calculation in the PowerPC to deal with the
new prefixed addressing that a future machine will have.
I wanted to use a numeric insn attribute, and I wanted to do:
(attr + 1) * 4
(define_attr "length" ""
(mult (plus (attr "num_prefixed_insns")
(const_int 1))
(const_int 4)))
When I looked at the code in insn-attrtab.c, I noticed it did not have
parenthesis in it. I.e.:
get_attr_num_prefixed_insns (insn) + 1 * 4
when it should be:
(get_attr_num_prefixed_insns (insn) + 1) * 4
>From gcc-bugs-return-656549-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 18:24:50 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/92108] New: [10 regression] r276645 triggers excess errors for gcc.dg/Wstringop-overflow-17.c
Date: Tue, 15 Oct 2019 18:24:00 -0000
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Bug ID: 92108
Summary: [10 regression] r276645 triggers excess errors for
gcc.dg/Wstringop-overflow-17.c
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: seurer at gcc dot gnu.org
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Executing on host: /home/seurer/gcc/build/gcc-test2/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test2/gcc/
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c
-fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -O2 -Wall -S -o Wstringop-overflow-17.s (timeout
= 300)
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-test2/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test2/gcc/
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c
-fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -O2 -Wall -S -o Wstringop-overflow-17.s
In function 'copy_n',
inlined from 'call_copy_n' at
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:18:3:
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:9:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c: In
function 'call_copy_n':
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:17:8:
note: destination object declared here
In function 'copy_n',
inlined from 'call_copy_n' at
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:18:3:
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:9:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c: In
function 'call_copy_n':
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:17:8:
note: destination object declared here
In function 'copy_n',
inlined from 'call_copy_n' at
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:18:3:
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:9:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c: In
function 'call_copy_n':
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:17:8:
note: destination object declared here
In function 'copy_n',
inlined from 'call_copy_n' at
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:18:3:
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:9:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c: In
function 'call_copy_n':
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:17:8:
note: destination object declared here
In function 'copy_n',
inlined from 'call_copy_n' at
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:18:3:
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:10:6:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c: In
function 'call_copy_n':
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:17:8:
note: destination object declared here
PASS: gcc.dg/Wstringop-overflow-17.c (test for warnings, line 10)
PASS: gcc.dg/Wstringop-overflow-17.c (test for warnings, line 17)
FAIL: gcc.dg/Wstringop-overflow-17.c (test for excess errors)
Excess errors:
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:9:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:9:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:9:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c:9:10:
warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
testcase /home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.dg/dg.exp completed in 1
seconds
=== gcc Summary ===
# of expected passes 2
# of unexpected failures 1
>From gcc-bugs-return-656550-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 18:29:24 2019
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Subject: [Bug c++/92104] __builtin_has_attribute in templates
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Last reconfirmed| |2019-10-15
Ever confirmed|0 |1
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
The built-in wasn't implemented for templates. It was a known limitation when
it was introduced that I didn't get around to removing with all the debates
about whether or not it should accept expressions.
>From gcc-bugs-return-656551-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 18:40:35 2019
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Subject: [Bug tree-optimization/92108] [10 regression] r276645 triggers excess errors for gcc.dg/Wstringop-overflow-17.c
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |msebor at gcc dot gnu.org
Resolution|--- |DUPLICATE
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Dupe of pr92016.
*** This bug has been marked as a duplicate of bug 92016 ***
>From gcc-bugs-return-656552-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 18:40:35 2019
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Subject: [Bug middle-end/92016] [10 Regression] excess errors in Wstringop-overflow-17.c
Date: Tue, 15 Oct 2019 18:40:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
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--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
*** Bug 92108 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-656553-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 18:48:33 2019
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From: "jan at jki dot io" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/92109] New: ICE in modify_call_stmt, at ipa-param-manipulation.c:1586
Date: Tue, 15 Oct 2019 18:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92109
Bug ID: 92109
Summary: ICE in modify_call_stmt, at
ipa-param-manipulation.c:1586
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: jan at jki dot io
CC: marxin at gcc dot gnu.org
Target Milestone: ---
ICE while compiling kjsembed with lto and -O3
/usr/libexec/gcc/x86_64-pc-linux-gnu/10.0.0-pre9999/lto1 -march=skylake -mmmx
-mno-3dnow -msse -msse2 -msse3 -mssse3 -mno-sse4a -mcx16 -msahf -mmovbe -maes
-mno-sha -mpclmul -mpopcnt -mabm -mno-lwp -mfma -mno-fma4 -mno-xop -mbmi -msgx
-mbmi2 -mno-pconfig -mno-wbnoinvd -mno-tbm -mavx -mavx2 -msse4.2 -msse4.1
-mlzcnt -mrtm -mhle -mrdrnd -mf16c -mfsgsbase -mrdseed -mprfchw -madx -mfxsr
-mxsave -mxsaveopt -mno-avx512f -mno-avx512er -mno-avx512cd -mno-avx512pf
-mno-prefetchwt1 -mclflushopt -mxsavec -mxsaves -mno-avx512dq -mno-avx512bw
-mno-avx512vl -mno-avx512ifma -mno-avx512vbmi -mno-avx5124fmaps
-mno-avx5124vnniw -mno-clwb -mno-mwaitx -mno-clzero -mno-pku -mno-rdpid
-mno-gfni -mno-shstk -mno-avx512vbmi2 -mno-avx512vnni -mno-vaes -mno-vpclmulqdq
-mno-avx512bitalg -mno-movdiri -mno-movdir64b -mno-waitpkg -mno-cldemote
-mno-ptwrite -mno-avx512bf16 -mno-enqcmd -mno-avx512vp2intersect -quiet
-dumpdir bin/ -dumpbase libKF5JsEmbed.so.5.63.0.ltrans6 -mmmx -mno-3dnow -msse
-msse2 -msse3 -mssse3 -mno-sse4a -mcx16 -msahf -mmovbe -maes -mno-sha -mpclmul
-mpopcnt -mabm -mno-lwp -mfma -mno-fma4 -mno-xop -mbmi -msgx -mbmi2
-mno-pconfig -mno-wbnoinvd -mno-tbm -mavx -mavx2 -msse4.2 -msse4.1 -mlzcnt
-mrtm -mhle -mrdrnd -mf16c -mfsgsbase -mrdseed -mprfchw -madx -mfxsr -mxsave
-mxsaveopt -mno-avx512f -mno-avx512er -mno-avx512cd -mno-avx512pf
-mno-prefetchwt1 -mclflushopt -mxsavec -mxsaves -mno-avx512dq -mno-avx512bw
-mno-avx512vl -mno-avx512ifma -mno-avx512vbmi -mno-avx5124fmaps
-mno-avx5124vnniw -mno-clwb -mno-mwaitx -mno-clzero -mno-pku -mno-rdpid
-mno-gfni -mno-shstk -mno-avx512vbmi2 -mno-avx512vnni -mno-vaes -mno-vpclmulqdq
-mno-avx512bitalg -mno-movdiri -mno-movdir64b -mno-waitpkg -mno-cldemote
-mno-ptwrite -mno-avx512bf16 -mno-enqcmd -mno-avx512vp2intersect -mtune=skylake
-mfpmath=sse -mtls-dialect=gnu2 -auxbase-strip
libKF5JsEmbed.so.5.63.0.ltrans6.ltrans.o -g -g -g -O3 -O3 -O3 -Wextra
-Wcast-align -Werror=return-type -Wpedantic -version -fdiagnostics-color=always
-fno-openmp -fno-openacc -fno-common -fPIC -fno-exceptions -fltrans
@/tmp/cc3qb0GE -o libKF5JsEmbed.so.5.63.0.ltrans6.s
GNU GIMPLE (Gentoo 10.0.0_pre9999) version 10.0.0-pre9999 20191015
(experimental) (x86_64-pc-linux-gnu)
compiled by GNU C version 10.0.0-pre9999 20191015 (experimental), GMP
version 6.1.2, MPFR version 4.0.2, MPC version 1.1.0, isl version isl-0.21-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
during IPA pass: materialize-all-clones
In function ‘throwError.constprop.isra’:
lto1: internal compiler error: in modify_call_stmt, at
ipa-param-manipulation.c:1586
0x6c35a5 ipa_param_body_adjustments::modify_call_stmt(gcall**)
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/ipa-param-manipulation.c:1586
0xfc8c2f remap_gimple_stmt
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/tree-inline.c:1921
0xfc67fc copy_bb
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/tree-inline.c:1996
0xfc67fc copy_cfg_body
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/tree-inline.c:2983
0xfc67fc copy_body
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/tree-inline.c:3231
0x13512a9 tree_function_versioning(tree_node*, tree_node*,
vec<ipa_replace_map*, va_gc, vl_embed>*, ipa_param_adjustments*, bool,
bitmap_head*, basic_block_def*)
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/tree-inline.c:6274
0xe0b6cd cgraph_materialize_clone
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/cgraphclones.c:1020
0xe0b6cd symbol_table::materialize_all_clones()
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/cgraphclones.c:1107
0x1318b8c execute
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/ipa.c:1396
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
lto-wrapper: fatal error:
/usr/x86_64-pc-linux-gnu/gcc-bin/10.0.0-pre9999/x86_64-pc-linux-gnu-g++
returned 1 exit status
compilation terminated.
>From gcc-bugs-return-656554-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 18:52:19 2019
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Subject: [Bug fortran/91426] Different colors for errors with multiple locations
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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CC| |egallager at gcc dot gnu.org
Resolution|FIXED |---
--- Comment #10 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to David Malcolm from comment #9)
> Fixed on trunk for GCC 10 by r276132.
I still see different colors in the following error as of r276658:
sci_gateway/fortran/intexecstr.f:96:19:
84 | call icopy(ln,istk(ld),-1,istk(ld+i1),-1)
| 2
......
96 | call icopy(6,retu,1,istk(l1),1)
| 1
Error: Rank mismatch between actual argument at (1) and actual argument at (2)
(scalar and rank-1)
(source file is from scilab/modules/functions:
https://github.com/cooljeanius/scilab/blob/master/scilab/modules/functions/sci_gateway/fortran/intexecstr.f
for reference)
>From gcc-bugs-return-656555-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 18:55:18 2019
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/91426] Different colors for errors with multiple locations
Date: Tue, 15 Oct 2019 18:55:00 -0000
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--- Comment #11 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #10)
> (In reply to David Malcolm from comment #9)
> > Fixed on trunk for GCC 10 by r276132.
>
> I still see different colors in the following error as of r276658:
>
> sci_gateway/fortran/intexecstr.f:96:19:
>
> 84 | call icopy(ln,istk(ld),-1,istk(ld+i1),-1)
> | 2
> ......
> 96 | call icopy(6,retu,1,istk(l1),1)
> | 1
> Error: Rank mismatch between actual argument at (1) and actual argument at
> (2) (scalar and rank-1)
>
> (source file is from scilab/modules/functions:
> https://github.com/cooljeanius/scilab/blob/master/scilab/modules/functions/
> sci_gateway/fortran/intexecstr.f for reference)
Eric: what colors are you seeing? The intent is that they *should* be colored
differently, but the colors of the "1" and "2" in the quoted source should now
match those of the "(1)" and "(2)" in the diagnostic text.
>From gcc-bugs-return-656556-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 18:57:51 2019
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Subject: [Bug c++/92105] [7/8/9/10 Regression] decltype(decltype(decltype)) prints exponential number of repeated errors
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |jason at gcc dot gnu.org
Target Milestone|--- |7.5
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r258110.
>From gcc-bugs-return-656557-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 19:00:33 2019
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Subject: [Bug ipa/92109] [10 Regression] ICE in modify_call_stmt, at ipa-param-manipulation.c:1586
Date: Tue, 15 Oct 2019 19:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92109
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |10.0
Summary|ICE in modify_call_stmt, at |[10 Regression] ICE in
|ipa-param-manipulation.c:15 |modify_call_stmt, at
|86 |ipa-param-manipulation.c:15
| |86
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Subject: [Bug rtl-optimization/92107] GCC's insn attribute arithmetic does not follow C rules
Date: Tue, 15 Oct 2019 19:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92107
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
it doesn't have to be anything to do with C rules, it's simply an incorrect
transcription of lispy arithmetic to C?
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/92016] [10 Regression] excess errors in Wstringop-overflow-17.c
Date: Tue, 15 Oct 2019 19:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92016
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Tue Oct 15 19:16:51 2019
New Revision: 277008
URL: https://gcc.gnu.org/viewcvs?rev=277008&root=gcc&view=rev
Log:
PR testsuite/92016 - Excess errors in Wstringop-overflow-17.c
gcc/testsuite/ChangeLog:
* gcc.dg/Wstringop-overflow-17.c: Expect an additional warning.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/Wstringop-overflow-17.c
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/92110] New: too many -Warray-bounds warnings for a loop buffer overflow
Date: Tue, 15 Oct 2019 19:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92110
Bug ID: 92110
Summary: too many -Warray-bounds warnings for a loop buffer
overflow
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
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As mentioned in bug 92016, when GCC unrolls a loop that writes past the end of
a buffer a separate instance of -Warray-bounds is issued for each iteration of
the loop that writes past the end of the destination. This can be seen in
output for the test case below. Likewise for -Wstringop-overflow when
-Warray-bounds is disabled. It would make the diagnostic output much less
cluttered (and less overwhelming) if just a single warning was issued instead
that descried the full extent of the buffer overflow (i.e., its size and offset
from the beginning of the buffer).
$ cat c.c && gcc -S -O2 -Wall -Wextra -fdump-tree-strlen=/dev/stdout
-fdump-tree-optimized=/dev/stdout c.c
static void f (char *p, unsigned n)
{
while (n--)
*p++ = 0;
}
void g (void*);
void h (void)
{
char a[4];
f (a, 8);
g (a);
}
c.c: In function ‘h’:
c.c:4:10: warning: array subscript 4 is outside array bounds of ‘char[4]’
[-Warray-bounds]
4 | *p++ = 0;
| ~~~~~^~~
c.c:11:8: note: while referencing ‘a’
11 | char a[4];
| ^
c.c:4:10: warning: array subscript 5 is outside array bounds of ‘char[4]’
[-Warray-bounds]
4 | *p++ = 0;
| ~~~~~^~~
c.c:11:8: note: while referencing ‘a’
11 | char a[4];
| ^
c.c:4:10: warning: array subscript 6 is outside array bounds of ‘char[4]’
[-Warray-bounds]
4 | *p++ = 0;
| ~~~~~^~~
c.c:11:8: note: while referencing ‘a’
11 | char a[4];
| ^
c.c:4:10: warning: array subscript 7 is outside array bounds of ‘char[4]’
[-Warray-bounds]
4 | *p++ = 0;
| ~~~~~^~~
c.c:11:8: note: while referencing ‘a’
11 | char a[4];
| ^
;; Function h (h, funcdef_no=1, decl_uid=1939, cgraph_uid=2, symbol_order=1)
;; 2 loops found
;;
;; Loop 0
;; header 0, latch 1
;; depth 0, outer -1
;; nodes: 0 1 2
;; 2 succs { 1 }
h ()
{
char * p;
unsigned int n;
char a[4];
<bb 2> [local count: 118111601]:
MEM[(char *)&a] = 0;
MEM[(char *)&a + 1B] = 0;
MEM[(char *)&a + 2B] = 0;
MEM[(char *)&a + 3B] = 0;
MEM[(char *)&a + 4B] = 0;
MEM[(char *)&a + 5B] = 0;
MEM[(char *)&a + 6B] = 0;
MEM[(char *)&a + 7B] = 0;
g (&a);
a ={v} {CLOBBER};
return;
}
;; Function h (h, funcdef_no=1, decl_uid=1939, cgraph_uid=2, symbol_order=1)
h ()
{
char a[4];
<bb 2> [local count: 118111601]:
MEM <unsigned long> [(char *)&a] = 0;
g (&a);
a ={v} {CLOBBER};
return;
}
$ gcc -S -O2 -Wall -Wextra -Wno-array-bounds c.c
static void f (char *p, unsigned n)
{
while (n--)
*p++ = 0;
}
void g (void*);
void h (void)
{
char a[4];
f (a, 8);
g (a);
}
In function ‘f’,
inlined from ‘h’ at c.c:12:3:
c.c:4:10: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
4 | *p++ = 0;
| ~~~~~^~~
c.c: In function ‘h’:
c.c:11:8: note: destination object declared here
11 | char a[4];
| ^
In function ‘f’,
inlined from ‘h’ at c.c:12:3:
c.c:4:10: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
4 | *p++ = 0;
| ~~~~~^~~
c.c: In function ‘h’:
c.c:11:8: note: destination object declared here
11 | char a[4];
| ^
In function ‘f’,
inlined from ‘h’ at c.c:12:3:
c.c:4:10: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
4 | *p++ = 0;
| ~~~~~^~~
c.c: In function ‘h’:
c.c:11:8: note: destination object declared here
11 | char a[4];
| ^
In function ‘f’,
inlined from ‘h’ at c.c:12:3:
c.c:4:10: warning: writing 1 byte into a region of size 0
[-Wstringop-overflow=]
4 | *p++ = 0;
| ~~~~~^~~
c.c: In function ‘h’:
c.c:11:8: note: destination object declared here
11 | char a[4];
| ^
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/88443] [meta-bug] bogus/missing -Wstringop-overflow warnings
Date: Tue, 15 Oct 2019 19:29:00 -0000
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Bug 88443 depends on bug 92016, which changed state.
Bug 92016 Summary: [10 Regression] excess errors in Wstringop-overflow-17.c
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92016
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/92016] [10 Regression] excess errors in Wstringop-overflow-17.c
Date: Tue, 15 Oct 2019 19:29:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
r277008 adjusts the test to expect the additional warning(s). Bug 92110 tracks
the problem with the repetitive warnings for each iteration of the loop.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/91426] Different colors for errors with multiple locations
Date: Tue, 15 Oct 2019 19:46:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
--- Comment #12 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to David Malcolm from comment #11)
> (In reply to Eric Gallager from comment #10)
> > (In reply to David Malcolm from comment #9)
> > > Fixed on trunk for GCC 10 by r276132.
> >
> > I still see different colors in the following error as of r276658:
> >
> > sci_gateway/fortran/intexecstr.f:96:19:
> >
> > 84 | call icopy(ln,istk(ld),-1,istk(ld+i1),-1)
> > | 2
> > ......
> > 96 | call icopy(6,retu,1,istk(l1),1)
> > | 1
> > Error: Rank mismatch between actual argument at (1) and actual argument at
> > (2) (scalar and rank-1)
> >
> > (source file is from scilab/modules/functions:
> > https://github.com/cooljeanius/scilab/blob/master/scilab/modules/functions/
> > sci_gateway/fortran/intexecstr.f for reference)
>
> Eric: what colors are you seeing? The intent is that they *should* be
> colored differently, but the colors of the "1" and "2" in the quoted source
> should now match those of the "(1)" and "(2)" in the diagnostic text.
Ah ok never mind, I guess this is fixed after all then.
(I was seeing red and green, for reference)
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Subject: [Bug tree-optimization/92111] New: ICE during GIMPLE pass: dom
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92111
Bug ID: 92111
Summary: ICE during GIMPLE pass: dom
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: jan at jki dot io
Target Milestone: ---
Created attachment 47043
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47043&action=edit
preprocessed source
during GIMPLE pass: dom
^[[01m^[[Kvulkan/qvulkanwindow.cpp:^[[m^[[K In member function
‘^[[01m^[[KcreateTransientImage^[[m^[[K’:
^[[01m^[[Kvulkan/qvulkanwindow.cpp:1289:6:^[[m^[[K ^[[01;31m^[[Kinternal
compiler error: ^[[m^[[KSegmentation fault
1289 | bool QVulkanWindowPrivate::createTransientImage(VkFormat format,
| ^[[01;31m^[[K^^[[m^[[K
0x7be519 crash_signal
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/toplev.c:326
0x7f5760f34b8f ???
/var/tmp/portage/sys-libs/glibc-2.30/work/glibc-2.30/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0x110d221 top_bit_of
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/wide-int.cc:423
0x110d221 wi::sub_large(long*, long const*, unsigned int, long const*, unsigned
int, unsigned int, signop, wi::overflow_type*)
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/wide-int.cc:1553
0x12241db wi::binary_traits<generic_wide_int<wide_int_storage>,
generic_wide_int<wide_int_storage>,
wi::int_traits<generic_wide_int<wide_int_storage> >::precision_type, wi::int_tr
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/wide-int.h:2537
0x12241db operator_cast::fold_range(tree_node*, value_range_base const&,
value_range_base const&) const
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/range-op.cc:1578
0x10ce178 range_fold_unary_expr(value_range_base*, tree_code, tree_node*,
value_range_base const*, tree_node*)
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/tree-vrp.c:1938
0x1101dfd vr_values::extract_range_from_unary_expr(value_range*, tree_code,
tree_node*, tree_node*)
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/vr-values.c:934
0x10fef07 vr_values::extract_range_from_assignment(value_range*, gassign*)
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/vr-values.c:1471
0x10fef07 vr_values::vrp_visit_assignment_or_call(gimple*, tree_node**,
value_range*)
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/vr-values.c:2090
0x10fef07 vr_values::extract_range_from_stmt(gimple*, edge_def**, tree_node**,
value_range*)
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/vr-values.c:2822
0x11e84f3 evrp_range_analyzer::record_ranges_from_stmt(gimple*, bool)
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/gimple-ssa-evrp-analyze.c:307
0x10b003a record_temporary_equivalences_from_stmts_at_dest
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/tree-ssa-threadedge.c:293
0x10af2a0 thread_through_normal_block
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/tree-ssa-threadedge.c:1062
0x10ae64d thread_across_edge
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/tree-ssa-threadedge.c:1260
0x10ae1d8 thread_outgoing_edges(basic_block_def*, gcond*, const_and_copies*,
avail_exprs_stack*, evrp_range_analyzer*, tree_node* (*)(gimple*, gimple*,
avail_exprs_stack*, basic_b
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/tree-ssa-threadedge.c:1464
0x101d0a5 dom_opt_dom_walker::after_dom_children(basic_block_def*)
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/tree-ssa-dom.c:1549
0x11dc081 dom_walker::walk(basic_block_def*)
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/domwalk.c:352
0x10179cf execute
/var/tmp/portage/sys-devel/gcc-10.0.0_pre9999/work/gcc-10.0.0_pre9999/gcc/tree-ssa-dom.c:724
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
lto-wrapper: fatal error: x86_64-pc-linux-gnu-g++ returned 1 exit status
compilation terminated.
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From: "jan at jki dot io" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/92111] ICE during GIMPLE pass: dom
Date: Tue, 15 Oct 2019 20:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92111
--- Comment #1 from Jan <jan at jki dot io> ---
Only happens with lto
>From gcc-bugs-return-656566-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 15 21:11:46 2019
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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/92112] New: fold strlen after strcmp(a, b) =Date: Tue, 15 Oct 2019 21:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92112
Bug ID: 92112
Summary: fold strlen after strcmp(a, b) == 0
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
After a strcmp call evaluates to zero the lengths of the two arguments can be
assumed to be equal. GCC could make use of that to fold strlen expressions
such as those in the test case below but doesn't (yet).
$ cat a.c && gcc -S -O2 -Wall -Wextra -fdump-tree-optimized=/dev/stdout a.c
extern char a[], b[];
void f (void)
{
if (__builtin_strcmp (a, b) != 0)
return;
if (__builtin_strlen (a) != __builtin_strlen (b)) // can be folded to false
__builtin_abort ();
}
void g (void)
{
if (__builtin_strlen (a) < 7)
return;
if (__builtin_strcmp (a, b) != 0)
return;
if (__builtin_strlen (b) < 7) // can be folded to false
__builtin_abort ();
}
;; Function f (f, funcdef_no=0, decl_uid=1932, cgraph_uid=1, symbol_order=0)
Removing basic block 6
Removing basic block 7
f ()
{
int _1;
long unsigned int _2;
long unsigned int _3;
<bb 2> [local count: 1073741824]:
_1 = __builtin_strcmp (&a, &b);
if (_1 != 0)
goto <bb 5>; [34.00%]
else
goto <bb 3>; [66.00%]
<bb 3> [local count: 708669605]:
_2 = __builtin_strlen (&a);
_3 = __builtin_strlen (&b);
if (_2 != _3)
goto <bb 4>; [0.00%]
else
goto <bb 5>; [100.00%]
<bb 4> [count: 0]:
__builtin_abort ();
<bb 5> [local count: 1073741824]:
return;
}
;; Function g (g, funcdef_no=1, decl_uid=1935, cgraph_uid=2, symbol_order=1)
Removing basic block 7
Removing basic block 8
Removing basic block 9
g ()
{
long unsigned int _1;
int _2;
long unsigned int _3;
<bb 2> [local count: 1073741823]:
_1 = __builtin_strlen (&a);
if (_1 <= 6)
goto <bb 6>; [34.00%]
else
goto <bb 3>; [66.00%]
<bb 3> [local count: 708669604]:
_2 = __builtin_strcmp (&a, &b);
if (_2 != 0)
goto <bb 6>; [34.00%]
else
goto <bb 4>; [66.00%]
<bb 4> [local count: 467721938]:
_3 = __builtin_strlen (&b);
if (_3 <= 6)
goto <bb 5>; [0.00%]
else
goto <bb 6>; [100.00%]
<bb 5> [count: 0]:
__builtin_abort ();
<bb 6> [local count: 1073741824]:
return;
}
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Subject: [Bug tree-optimization/92112] fold strlen after strcmp(a, b) == 0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92112
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Blocks| |83819
Severity|normal |enhancement
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83819
[Bug 83819] [meta-bug] missing strlen optimizations
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