[Bug tree-optimization/119291] New: wrong code at -O{2,3} with "-fno-thread-jumps" on x86_64-linux-gnu

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119291

            Bug ID: 119291
           Summary: wrong code at -O{2,3} with "-fno-thread-jumps" 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 regression from 12.* and affects 13.* and later. 

Compiler Explorer: https://godbolt.org/z/saoqG5cvv


[510] % 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 20250314 (experimental) (GCC) 
[511] % 
[511] % gcctk -O3 small.c; ./a.out
[512] % gcctk -O3 -fno-thread-jumps small.c
[513] % timeout -s 9 5 ./a.out
Killed
[514] % 
[514] % cat small.c
int a, b, f;
long c;
volatile int d;
int main() {
  int e = 1;
 L:
  if (a < 2) {
    b = e;
    e = -(~c & (c & -(a && b)));
    c = e || c;
    a = ~e / ~b;
    if (a) {
      d;
      goto L;
    }
  }
}