[Bug tree-optimization/97695] New: wrong code at -O3 on x86_64-pc-linux-gnu

[zhendong.su at inf dot ethz.ch via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97695

            Bug ID: 97695
           Summary: wrong code at -O3 on x86_64-pc-linux-gnu
           Product: gcc
           Version: 11.0
            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: ---

[508] % 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/11.0.0/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 11.0.0 20201103 (experimental) [master revision
682ed7ad230:259379fab27:0caf400a865cb771f76bf1025cfc2a83e8ef00ed] (GCC) 
[509] % 
[509] % gcctk -O2 small.c; ./a.out
[510] % 
[510] % gcctk -O3 small.c; ./a.out
Floating point exception
[511] % 
[511] % cat small.c
int *a, b, **c = &a, d, e;

int f(int g, int h) { return !h || (g && h == 1) ? 0 : g / h; }

static void *i(int g) {
  while (e < 2)
    if (!f(g, 9)) {
      while (b)
        ;
      return 0;
    }
  return 0;
}

void j() {
  i(1);
  *c = i(d);
}

int main() { j(); return 0; }