public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [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
end of thread, other threads:[~2022-02-15 12:54 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
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
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).