[Bug tree-optimization/101105] New: wrong code at -O3 on x86_64-linux-gnu

[qrzhang at gatech dot edu via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101105

            Bug ID: 101105
           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: qrzhang at gatech dot edu
  Target Milestone: ---

It appears to be a regression in 11.

$ gcc-trunk -v
Configured with: ../gcc/configure --prefix=/nethome/qzhang414/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20210616 (experimental) [master revision
041f7417707:a530c589490:3155d51bfd1de8b6c4645dcb2292248a8d7cc3c9] (GCC)



$ gcc-trunk abc.c ; ./a.out
2

$ gcc-trunk -O3 abc.c ; ./a.out
Segmentation fault


$ cat abc.c
short a;
int b[5][4] = {2, 2};
long *c;
int d;
short(e)(f) { return f == 0 || a && f == 1 ? 0 : a; }
int main() {
  int g, h;
  g = 3;
  for (; g >= 0; g--) {
    h = 3;
    for (; h >= 0; h--)
      b[g][h] = b[0][1] && e(1);
  }
  d = b[0][1];
  if (d)
    *c = 4073709551611;
  printf("%d\n", 2);
}