https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119586
Bug ID: 119586
Summary: wrong code at -O2 with "-ftree-loop-vectorize
-fno-inline" 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, and doesn't reproduce with 14.2 and
earlier.
Compiler Explorer: https://godbolt.org/z/scbTcvonz
[510] % 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/15.0.1/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 15.0.1 20250402 (experimental) (GCC)
[511] %
[511] % gcctk -O2 small.c; ./a.out
[512] % gcctk -O2 -ftree-loop-vectorize -fno-inline small.c
[513] % ./a.out
Segmentation fault
[514] %
[514] % cat small.c
int a, b, c;
int d() {
long e[6][8][5];
int f;
for (; b < 6; b++)
for (c = 0; c < 8; c++)
for (f = 0; f < 5; f++)
e[b][c][f] = 1;
a = e[2][2][4] && e[2][0][0];
if (e[5][2][1])
return 0;
return 1;
}
int main() { d(); }
