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* [Bug tree-optimization/111792] New: wrong code at -O3 on x86_64-linux-gnu
@ 2023-10-13 6:28 zhendong.su at inf dot ethz.ch
2023-10-13 6:59 ` [Bug tree-optimization/111792] [14 Regression] " rguenth at gcc dot gnu.org
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: zhendong.su at inf dot ethz.ch @ 2023-10-13 6:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111792
Bug ID: 111792
Summary: wrong code at -O3 on x86_64-linux-gnu
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zhendong.su at inf dot ethz.ch
Target Milestone: ---
It appears to be a recent regression.
compiler Explorer: https://godbolt.org/z/7vfzPYTrn
[537] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20231013 (experimental) (GCC)
[538] %
[538] % gcctk -O2 small.c; ./a.out
[539] %
[539] % gcctk -O3 small.c
[540] % ./a.out
Aborted
[541] % cat small.c
int c, d, h, i, j, l, *n = &h;
short e, f, g, *k, m;
long o;
short p(short p1, int q) { return q >= 32 || p1 > 5 >> q ? 1 : p1 << q; }
long u(unsigned p1) {
int r = 50, s, *t = &c;
L:
m && (*k = 0);
for (d = 1; d; d--)
for (s = 0; s < 3; s++) {
*n = i ^ p1;
*t = p1 > (unsigned)p((unsigned)(o = 4073709551615) >= p1 && 5, r);
if (f)
goto L;
}
for (; e < 1;)
return j;
int *b[2] = {&s, &r};
for (; l; l--) {
long a[1];
for (r = 0; r < 1; r++) {
h = a[0];
if (g)
goto L;
}
}
return 0;
}
int main() {
u(6);
if (c != 1)
__builtin_abort();
return 0;
}
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/111792] [14 Regression] wrong code at -O3 on x86_64-linux-gnu
2023-10-13 6:28 [Bug tree-optimization/111792] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
@ 2023-10-13 6:59 ` rguenth at gcc dot gnu.org
2023-10-17 13:14 ` rguenth at gcc dot gnu.org
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-10-13 6:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111792
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|wrong code at -O3 on |[14 Regression] wrong code
|x86_64-linux-gnu |at -O3 on x86_64-linux-gnu
Target Milestone|--- |14.0
CC| |rguenth at gcc dot gnu.org
Keywords| |needs-bisection, wrong-code
Status|UNCONFIRMED |NEW
Version|unknown |14.0
Ever confirmed|0 |1
Last reconfirmed| |2023-10-13
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. -fno-tree-loop-vectorize fixes it. We vectorize
for (; l; l--) {
long a[1];
for (r = 0; r < 1; r++) {
h = a[0];
if (g)
goto L;
}
}
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/111792] [14 Regression] wrong code at -O3 on x86_64-linux-gnu
2023-10-13 6:28 [Bug tree-optimization/111792] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2023-10-13 6:59 ` [Bug tree-optimization/111792] [14 Regression] " rguenth at gcc dot gnu.org
@ 2023-10-17 13:14 ` rguenth at gcc dot gnu.org
2023-10-17 13:59 ` [Bug tree-optimization/111792] [14 Regression] wrong code at -O3 on x86_64-linux-gnu since r14-3414-g0cfc9c953d0221 ppalka at gcc dot gnu.org
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-10-17 13:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111792
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/111792] [14 Regression] wrong code at -O3 on x86_64-linux-gnu since r14-3414-g0cfc9c953d0221
2023-10-13 6:28 [Bug tree-optimization/111792] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2023-10-13 6:59 ` [Bug tree-optimization/111792] [14 Regression] " rguenth at gcc dot gnu.org
2023-10-17 13:14 ` rguenth at gcc dot gnu.org
@ 2023-10-17 13:59 ` ppalka at gcc dot gnu.org
2023-11-05 22:24 ` pinskia at gcc dot gnu.org
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: ppalka at gcc dot gnu.org @ 2023-10-17 13:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111792
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|needs-bisection |
CC| |amacleod at redhat dot com,
| |ppalka at gcc dot gnu.org
Summary|[14 Regression] wrong code |[14 Regression] wrong code
|at -O3 on x86_64-linux-gnu |at -O3 on x86_64-linux-gnu
| |since
| |r14-3414-g0cfc9c953d0221
--- Comment #2 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Started with r14-3414-g0cfc9c953d0221
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/111792] [14 Regression] wrong code at -O3 on x86_64-linux-gnu since r14-3414-g0cfc9c953d0221
2023-10-13 6:28 [Bug tree-optimization/111792] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
` (2 preceding siblings ...)
2023-10-17 13:59 ` [Bug tree-optimization/111792] [14 Regression] wrong code at -O3 on x86_64-linux-gnu since r14-3414-g0cfc9c953d0221 ppalka at gcc dot gnu.org
@ 2023-11-05 22:24 ` pinskia at gcc dot gnu.org
2023-11-10 16:23 ` jakub at gcc dot gnu.org
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-11-05 22:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111792
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |needs-bisection
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I can no longer reproduce this on the trunk.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/111792] [14 Regression] wrong code at -O3 on x86_64-linux-gnu since r14-3414-g0cfc9c953d0221
2023-10-13 6:28 [Bug tree-optimization/111792] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
` (3 preceding siblings ...)
2023-11-05 22:24 ` pinskia at gcc dot gnu.org
@ 2023-11-10 16:23 ` jakub at gcc dot gnu.org
2023-11-13 9:42 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: jakub at gcc dot gnu.org @ 2023-11-10 16:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111792
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Indeed, doesn't reproduce since
r14-4786-gd118738e71cf4615f170fff8dabe66442206d008
Was that a fix for this or just made the bug latent?
In any case, we should add the testcase to the testsuite...
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/111792] [14 Regression] wrong code at -O3 on x86_64-linux-gnu since r14-3414-g0cfc9c953d0221
2023-10-13 6:28 [Bug tree-optimization/111792] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
` (4 preceding siblings ...)
2023-11-10 16:23 ` jakub at gcc dot gnu.org
@ 2023-11-13 9:42 ` rguenth at gcc dot gnu.org
2023-11-13 12:40 ` cvs-commit at gcc dot gnu.org
2023-11-13 12:41 ` rguenth at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-11-13 9:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111792
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Status|NEW |ASSIGNED
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
I doubt that it was a proper fix, but I'll have a look.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/111792] [14 Regression] wrong code at -O3 on x86_64-linux-gnu since r14-3414-g0cfc9c953d0221
2023-10-13 6:28 [Bug tree-optimization/111792] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
` (5 preceding siblings ...)
2023-11-13 9:42 ` rguenth at gcc dot gnu.org
@ 2023-11-13 12:40 ` cvs-commit at gcc dot gnu.org
2023-11-13 12:41 ` rguenth at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2023-11-13 12:40 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111792
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:a0b2abef4e62d816f669df478a3cc320647c3b31
commit r14-5391-ga0b2abef4e62d816f669df478a3cc320647c3b31
Author: Richard Biener <rguenther@suse.de>
Date: Mon Nov 13 13:38:57 2023 +0100
tree-optimization/111792 - new testcase
This was fixed as part of the PR111000 fix.
PR tree-optimization/111792
PR tree-optimization/111000
* gcc.dg/torture/pr111792.c: New testcase.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug tree-optimization/111792] [14 Regression] wrong code at -O3 on x86_64-linux-gnu since r14-3414-g0cfc9c953d0221
2023-10-13 6:28 [Bug tree-optimization/111792] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
` (6 preceding siblings ...)
2023-11-13 12:40 ` cvs-commit at gcc dot gnu.org
@ 2023-11-13 12:41 ` rguenth at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-11-13 12:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111792
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
It was indeed a proper fix, will add the testcase.
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2023-11-13 12:41 UTC | newest]
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2023-10-13 6:28 [Bug tree-optimization/111792] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2023-10-13 6:59 ` [Bug tree-optimization/111792] [14 Regression] " rguenth at gcc dot gnu.org
2023-10-17 13:14 ` rguenth at gcc dot gnu.org
2023-10-17 13:59 ` [Bug tree-optimization/111792] [14 Regression] wrong code at -O3 on x86_64-linux-gnu since r14-3414-g0cfc9c953d0221 ppalka at gcc dot gnu.org
2023-11-05 22:24 ` pinskia at gcc dot gnu.org
2023-11-10 16:23 ` jakub at gcc dot gnu.org
2023-11-13 9:42 ` rguenth at gcc dot gnu.org
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