1  /* PR tree-optimization/102622 */
       2  /* Wrong code introduced due to phi-opt
       3     introducing undefined signed interger overflow
       4     with one bit signed integer negation. */
       5  
       6  struct f{signed t:1;};
       7  int g(struct f *a, int t) __attribute__((noipa));
       8  int g(struct f *a, int t)
       9  {
      10      if (t)
      11        a->t = -1;
      12      else
      13        a->t = 0;
      14      int t1 = a->t;
      15      if (t1) return 1;
      16      return t1;
      17  }
      18  
      19  int main(void)
      20  {
      21      struct f a;
      22      if (!g(&a, 1))  __builtin_abort();
      23      return 0;
      24  }