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* [Bug target/115671] New: wrong code at -O1 with "-fgcse -fno-inline -fschedule-insns" on x86_64-linux-gnu
@ 2024-06-26 21:54 zhendong.su at inf dot ethz.ch
2024-06-27 3:44 ` [Bug target/115671] " sjames at gcc dot gnu.org
2024-06-27 5:58 ` [Bug target/115671] [15 Regression] " rguenth at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: zhendong.su at inf dot ethz.ch @ 2024-06-26 21:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115671
Bug ID: 115671
Summary: wrong code at -O1 with "-fgcse -fno-inline
-fschedule-insns" on x86_64-linux-gnu
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: zhendong.su at inf dot ethz.ch
Target Milestone: ---
It seems to be a recent regression as it doesn't reproduce with 14.1.
Compiler Explorer: https://godbolt.org/z/Ev6hsWhE1
[648] % 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/15.0.0/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 15.0.0 20240626 (experimental) (GCC)
[649] %
[649] % gcctk -O1 small.c; ./a.out
[650] %
[650] % gcctk -O1 -fgcse -fno-inline -fschedule-insns small.c
[651] % ./a.out
Aborted
[652] %
[652] % cat small.c
int printf(const char *, ...);
int a, b, c, d, e;
short f[2];
int g(int h, int i) { return 0; }
int j(int h, int i) { return i; }
void k() {
int l;
for (; b < 1; b++) {
l = g(a, e);
c = l < a;
e = j(f[1 + b], 2);
d = a || d;
if (j(0, 1))
return;
}
}
int main() {
k();
if (c != 0)
__builtin_abort();
return 0;
}
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/115671] wrong code at -O1 with "-fgcse -fno-inline -fschedule-insns" on x86_64-linux-gnu
2024-06-26 21:54 [Bug target/115671] New: wrong code at -O1 with "-fgcse -fno-inline -fschedule-insns" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
@ 2024-06-27 3:44 ` sjames at gcc dot gnu.org
2024-06-27 5:58 ` [Bug target/115671] [15 Regression] " rguenth at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: sjames at gcc dot gnu.org @ 2024-06-27 3:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115671
Sam James <sjames at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sjames at gcc dot gnu.org
--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
I can't reproduce this with a GCC patched for PR115661.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug target/115671] [15 Regression] wrong code at -O1 with "-fgcse -fno-inline -fschedule-insns" on x86_64-linux-gnu
2024-06-26 21:54 [Bug target/115671] New: wrong code at -O1 with "-fgcse -fno-inline -fschedule-insns" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2024-06-27 3:44 ` [Bug target/115671] " sjames at gcc dot gnu.org
@ 2024-06-27 5:58 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2024-06-27 5:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115671
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|unknown |15.0
Target Milestone|--- |15.0
Target| |x86_64-*-*
Summary|wrong code at -O1 with |[15 Regression] wrong code
|"-fgcse -fno-inline |at -O1 with "-fgcse
|-fschedule-insns" on |-fno-inline
|x86_64-linux-gnu |-fschedule-insns" on
| |x86_64-linux-gnu
^ permalink raw reply [flat|nested] 3+ messages in thread
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2024-06-26 21:54 [Bug target/115671] New: wrong code at -O1 with "-fgcse -fno-inline -fschedule-insns" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2024-06-27 3:44 ` [Bug target/115671] " sjames at gcc dot gnu.org
2024-06-27 5:58 ` [Bug target/115671] [15 Regression] " rguenth at gcc dot gnu.org
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