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* [Bug c/109925] New: Wrong code at -O2 on x86_64-linux-gnu since GCC-12
@ 2023-05-21 15:02 shaohua.li at inf dot ethz.ch
2023-05-21 15:17 ` [Bug tree-optimization/109925] [10/11/12/13/14 Regression] " jakub at gcc dot gnu.org
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: shaohua.li at inf dot ethz.ch @ 2023-05-21 15:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109925
Bug ID: 109925
Summary: Wrong code at -O2 on x86_64-linux-gnu since GCC-12
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: shaohua.li at inf dot ethz.ch
Target Milestone: ---
For the following code, gcc trunk emits wrong code at -O2.
Compiler explorer: https://godbolt.org/z/hcnaxoPaP
$ cat a.c
int printf(const char *, ...);
int a, c, f;
int main() {
int g[2];
c = 0;
for (; c < 2; c++) {
{
char h[20];
char *b = h;
int d = 48, e = 0;
while (d && e < 5)
b[e++] = d /= 10;
f = e;
}
g[f - 2 + c] = 0;
}
for (;;) {
for (; a <= 4; a++)
if (g[0])
break;
break;
}
printf("%d\n", a);
}
$
$ gcc-tk -O0 a.c && ./a.out
5
$ gcc-tk -O2 a.c && ./a.out
0
$ gcc-tk -v
Using built-in specs.
COLLECT_GCC=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-f211757f6fa9515e3fd1a4f66f1a8b48e500c9de/bin/gcc
COLLECT_LTO_WRAPPER=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-f211757f6fa9515e3fd1a4f66f1a8b48e500c9de/libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --disable-multilib --disable-bootstrap
--enable-languages=c,c++
--prefix=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-f211757f6fa9515e3fd1a4f66f1a8b48e500c9de
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230521 (experimental) (GCC)
$
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/109925] [10/11/12/13/14 Regression] Wrong code at -O2 on x86_64-linux-gnu since GCC-12
2023-05-21 15:02 [Bug c/109925] New: Wrong code at -O2 on x86_64-linux-gnu since GCC-12 shaohua.li at inf dot ethz.ch
@ 2023-05-21 15:17 ` jakub at gcc dot gnu.org
2023-05-26 6:33 ` rguenth at gcc dot gnu.org
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: jakub at gcc dot gnu.org @ 2023-05-21 15:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109925
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
CC| |hubicka at gcc dot gnu.org,
| |jakub at gcc dot gnu.org
Target Milestone|--- |10.5
Component|c |tree-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2023-05-21
Summary|Wrong code at -O2 on |[10/11/12/13/14 Regression]
|x86_64-linux-gnu since |Wrong code at -O2 on
|GCC-12 |x86_64-linux-gnu since
| |GCC-12
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
With
int a, c, f;
int
main ()
{
int g[2];
for (c = 0; c < 2; c++)
{
{
char h[20], *b = h;
int d = 48, e = 0;
while (d && e < 5)
b[e++] = d /= 10;
f = e;
}
g[f - 2 + c] = 0;
}
for (;;)
{
for (; a <= 4; a++)
if (g[0])
break;
break;
}
if (a != 5)
__builtin_abort ();
return 0;
}
at -O2 this started with r7-1513-g1dc8d15bc6d7d55c7731093e
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/109925] [10/11/12/13/14 Regression] Wrong code at -O2 on x86_64-linux-gnu since GCC-12
2023-05-21 15:02 [Bug c/109925] New: Wrong code at -O2 on x86_64-linux-gnu since GCC-12 shaohua.li at inf dot ethz.ch
2023-05-21 15:17 ` [Bug tree-optimization/109925] [10/11/12/13/14 Regression] " jakub at gcc dot gnu.org
@ 2023-05-26 6:33 ` rguenth at gcc dot gnu.org
2023-07-07 10:45 ` [Bug tree-optimization/109925] [11/12/13/14 " rguenth at gcc dot gnu.org
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-05-26 6:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109925
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
-fstack-reuse=none fixes this, the testcase looks similar to PR109967.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/109925] [11/12/13/14 Regression] Wrong code at -O2 on x86_64-linux-gnu since GCC-12
2023-05-21 15:02 [Bug c/109925] New: Wrong code at -O2 on x86_64-linux-gnu since GCC-12 shaohua.li at inf dot ethz.ch
2023-05-21 15:17 ` [Bug tree-optimization/109925] [10/11/12/13/14 Regression] " jakub at gcc dot gnu.org
2023-05-26 6:33 ` rguenth at gcc dot gnu.org
@ 2023-07-07 10:45 ` rguenth at gcc dot gnu.org
2024-01-12 13:32 ` rguenth at gcc dot gnu.org
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-07-07 10:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109925
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|10.5 |11.5
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 10 branch is being closed.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/109925] [11/12/13/14 Regression] Wrong code at -O2 on x86_64-linux-gnu since GCC-12
2023-05-21 15:02 [Bug c/109925] New: Wrong code at -O2 on x86_64-linux-gnu since GCC-12 shaohua.li at inf dot ethz.ch
` (2 preceding siblings ...)
2023-07-07 10:45 ` [Bug tree-optimization/109925] [11/12/13/14 " rguenth at gcc dot gnu.org
@ 2024-01-12 13:32 ` rguenth at gcc dot gnu.org
2024-03-27 16:50 ` jakub at gcc dot gnu.org
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2024-01-12 13:32 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109925
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/109925] [11/12/13/14 Regression] Wrong code at -O2 on x86_64-linux-gnu since GCC-12
2023-05-21 15:02 [Bug c/109925] New: Wrong code at -O2 on x86_64-linux-gnu since GCC-12 shaohua.li at inf dot ethz.ch
` (3 preceding siblings ...)
2024-01-12 13:32 ` rguenth at gcc dot gnu.org
@ 2024-03-27 16:50 ` jakub at gcc dot gnu.org
2024-03-28 11:00 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: jakub at gcc dot gnu.org @ 2024-03-27 16:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109925
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Doesn't reproduce on the trunk since
r14-4089-gd45ddc2c04e471d0dcee016b6edacc00b8341b16
Doesn't reproduce on 13 branch either, the PR113372 fixed it there.
So, I think we should just add the testcase to the testsuite and remove 13/14
markers.
Will handle that.
PR113372 hasn't been backported to 12/11 yet.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/109925] [11/12/13/14 Regression] Wrong code at -O2 on x86_64-linux-gnu since GCC-12
2023-05-21 15:02 [Bug c/109925] New: Wrong code at -O2 on x86_64-linux-gnu since GCC-12 shaohua.li at inf dot ethz.ch
` (4 preceding siblings ...)
2024-03-27 16:50 ` jakub at gcc dot gnu.org
@ 2024-03-28 11:00 ` cvs-commit at gcc dot gnu.org
2024-03-28 11:01 ` jakub at gcc dot gnu.org
2024-03-30 3:55 ` cvs-commit at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2024-03-28 11:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109925
--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:7942558f27038461f948ca10140a156ae678cdf8
commit r14-9704-g7942558f27038461f948ca10140a156ae678cdf8
Author: Jakub Jelinek <jakub@redhat.com>
Date: Thu Mar 28 11:58:26 2024 +0100
testsuite: Add testcase for already fixed PR [PR109925]
This testcase was made latent by r14-4089 and got fixed both
on the trunk and 13 branch with PR113372 fix.
Adding testcase to the testsuite and will close the PR as a dup.
2024-03-28 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/109925
* gcc.c-torture/execute/pr109925.c: New test.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/109925] [11/12/13/14 Regression] Wrong code at -O2 on x86_64-linux-gnu since GCC-12
2023-05-21 15:02 [Bug c/109925] New: Wrong code at -O2 on x86_64-linux-gnu since GCC-12 shaohua.li at inf dot ethz.ch
` (5 preceding siblings ...)
2024-03-28 11:00 ` cvs-commit at gcc dot gnu.org
@ 2024-03-28 11:01 ` jakub at gcc dot gnu.org
2024-03-30 3:55 ` cvs-commit at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: jakub at gcc dot gnu.org @ 2024-03-28 11:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109925
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed some time ago.
*** This bug has been marked as a duplicate of bug 113372 ***
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/109925] [11/12/13/14 Regression] Wrong code at -O2 on x86_64-linux-gnu since GCC-12
2023-05-21 15:02 [Bug c/109925] New: Wrong code at -O2 on x86_64-linux-gnu since GCC-12 shaohua.li at inf dot ethz.ch
` (6 preceding siblings ...)
2024-03-28 11:01 ` jakub at gcc dot gnu.org
@ 2024-03-30 3:55 ` cvs-commit at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2024-03-30 3:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109925
--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:43022dd24e82a8625895e35da2b7e5a45f3b7483
commit r13-8524-g43022dd24e82a8625895e35da2b7e5a45f3b7483
Author: Jakub Jelinek <jakub@redhat.com>
Date: Thu Mar 28 11:58:26 2024 +0100
testsuite: Add testcase for already fixed PR [PR109925]
This testcase was made latent by r14-4089 and got fixed both
on the trunk and 13 branch with PR113372 fix.
Adding testcase to the testsuite and will close the PR as a dup.
2024-03-28 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/109925
* gcc.c-torture/execute/pr109925.c: New test.
(cherry picked from commit 7942558f27038461f948ca10140a156ae678cdf8)
^ permalink raw reply [flat|nested] 9+ messages in thread
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2023-05-21 15:02 [Bug c/109925] New: Wrong code at -O2 on x86_64-linux-gnu since GCC-12 shaohua.li at inf dot ethz.ch
2023-05-21 15:17 ` [Bug tree-optimization/109925] [10/11/12/13/14 Regression] " jakub at gcc dot gnu.org
2023-05-26 6:33 ` rguenth at gcc dot gnu.org
2023-07-07 10:45 ` [Bug tree-optimization/109925] [11/12/13/14 " rguenth at gcc dot gnu.org
2024-01-12 13:32 ` rguenth at gcc dot gnu.org
2024-03-27 16:50 ` jakub at gcc dot gnu.org
2024-03-28 11:00 ` cvs-commit at gcc dot gnu.org
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