https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105014

--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
Minimal test-case:
...
void __attribute__((noinline)) foo (unsigned long long d0) {
  unsigned long long __a;
  __a = 0x38;
  for (; __a > 0; __a -= 8)
    if (((d0 >> __a) & 0xff) != 0)
      break;

   __builtin_printf ("__a: 0x%llx\n", __a);
}

int main (void) {
  foo (1);
  return 0;
}
...

Different value of __a:
...
$ ./install/bin/nvptx-none-run -O0 ./pr97459-1.exe ; echo;
./install/bin/nvptx-none-run ./pr97459-1.exe 
__a: 0x0

__a: 0x30
...

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