[Bug tree-optimization/103152] New: wrong code at -O1 on x86_64-linux-gnu

[zhendong.su at inf dot ethz.ch]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103152

            Bug ID: 103152
           Summary: wrong code at -O1 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: ---

This appears to be a recent regression.

[577] % 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 --enable-multilib --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20211109 (experimental) [master r12-5011-g2abd924f91e] (GCC) 
[578] % 
[578] % gcctk -O0 small.c; ./a.out
[579] % 
[579] % gcctk -O1 small.c
[580] % ./a.out
Aborted
[581] % 
[581] % cat small.c
struct {
  int a:1;
} b;
int *c = (int *)&b, d;
int main() {
  d = c && (b.a = (d < 0) ^ 3);
  if (d != 1)
    __builtin_abort();
  return 0;
}