[Bug tree-optimization/118535] New: wrong code at -O{2,3} on x86_64-linux-gnu

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118535

            Bug ID: 118535
           Summary: wrong code at -O{2,3} 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 from 14.2.

Compiler Explorer: https://godbolt.org/z/ohM7hT8Gn

[559] % 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/15.0.1/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 15.0.1 20250117 (experimental) (GCC) 
[560] % 
[560] % gcctk -O2 small.c
[561] % ./a.out
Aborted
[562] % 
[562] % cat small.c
int a, b, c, d, e, f, *g = &b;
static int h(int i) { return i < 0 || i > a ? 0 : i << a; }
static int j(unsigned short i) {
  f = d == e;
  *g = h(65535 ^ i);
  return c;
}
int main() {
  j(0);
  h(0);
  if (b != 0)
    __builtin_abort();
  return 0;
}