1  /* { dg-do compile } */
       2  /* { dg-options "-O2" }  */
       3  
       4  extern void overflow_handler ();
       5  
       6  unsigned long overflow_sub (unsigned long x, unsigned long y)
       7  {
       8    unsigned long r;
       9  
      10    int ovr = __builtin_usubl_overflow (x, y, &r);
      11    if (ovr)
      12      overflow_handler ();
      13  
      14    return r;
      15  }
      16  
      17  /* { dg-final { scan-assembler "subs" } } */