[Bug tree-optimization/103873] New: wrong code at -O3 on x86_64-linux-gnu

[zhendong.su at inf dot ethz.ch via 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;
}