[Bug tree-optimization/121382] New: wrong code at -O2 on x86_64-linux-gnu

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121382

            Bug ID: 121382
           Summary: wrong code at -O2 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: ---

Compiler Explorer: https://godbolt.org/z/oe6Phrb1f

Note:
* Perhaps related: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121378
* But this test also fails with 15.1 

[512] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/home/suz/suz-local/software/local/gcc-trunk/bin/../libexec/gcc/x86_64-pc-linux-gnu/16.0.0/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 16.0.0 20250803 (experimental) (GCC) 
[513] % 
[513] % gcctk -O2 small.c
[514] % ./a.out
Aborted
[515] % cat small.c
int printf(const char *, ...);
int a, b, c;
static int d(int e, int f) {
  do {
    f = f - e;
    if (c - 9 * f) {
      a = b = a ^ 1;
      return b;
    }
  } while (c);
  return 0;
}
int main() {
  d(5, 1);
  d(2147483647, 2147483647);
  if (b != 1)
    __builtin_abort();
  return 0;
}