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* [Bug tree-optimization/103873] New: wrong code at -O3 on x86_64-linux-gnu
@ 2021-12-31 10:55 zhendong.su at inf dot ethz.ch
2021-12-31 15:26 ` [Bug tree-optimization/103873] [12 Regression] " jakub at gcc dot gnu.org
2022-02-15 12:54 ` rguenth at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: zhendong.su at inf dot ethz.ch @ 2021-12-31 10:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103873
Bug ID: 103873
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.
[568] % 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/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++
--disable-werror --disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20211231 (experimental) (GCC)
[569] %
[569] % gcctk -O2 small.c; ./a.out
[570] %
[570] % gcctk -O3 small.c
[571] % ./a.out
Aborted
[572] %
[572] % cat small.c
int a, b, c, d[3], e, f;
int main() {
if (b)
goto L;
for (; f < 1; f++)
for (; a < 1; a++) {
for (c = 0; c < 3; c++)
for (e = 0; e < 3; e++)
d[e] |= c;
for (; b; b++)
L:;
}
if (d[1] != 3)
__builtin_abort();
return 0;
}
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/103873] [12 Regression] wrong code at -O3 on x86_64-linux-gnu
2021-12-31 10:55 [Bug tree-optimization/103873] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
@ 2021-12-31 15:26 ` jakub at gcc dot gnu.org
2022-02-15 12:54 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-12-31 15:26 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103873
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
CC| |jakub at gcc dot gnu.org,
| |matz at gcc dot gnu.org
Summary|wrong code at -O3 on |[12 Regression] wrong code
|x86_64-linux-gnu |at -O3 on x86_64-linux-gnu
Status|UNCONFIRMED |NEW
Version|unknown |12.0
Priority|P3 |P1
Target Milestone|--- |12.0
Last reconfirmed| |2021-12-31
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started to ICE with r12-4526-gd8edfadfc7a9795b65177a50ce44fd348858e844
(before it compiled and executed fine) and starting with
r12-5264-gd1ca8aeaf34a717dffd8f4a1f0333d25c7d1c904 it doesn't ICE anymore but
is instead miscompiled.
Perhaps related to PR103300 ?
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/103873] [12 Regression] wrong code at -O3 on x86_64-linux-gnu
2021-12-31 10:55 [Bug tree-optimization/103873] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2021-12-31 15:26 ` [Bug tree-optimization/103873] [12 Regression] " jakub at gcc dot gnu.org
@ 2022-02-15 12:54 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-02-15 12:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103873
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|NEW |RESOLVED
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed by the fix for PR104543.
*** This bug has been marked as a duplicate of bug 104543 ***
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-12-31 10:55 [Bug tree-optimization/103873] New: wrong code at -O3 on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2021-12-31 15:26 ` [Bug tree-optimization/103873] [12 Regression] " jakub at gcc dot gnu.org
2022-02-15 12:54 ` rguenth at gcc dot gnu.org
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