1  /* { dg-options "-O2 -msoft-stack" } */
       2  
       3  int
       4  f (void)
       5  {
       6    int a = 0;
       7    return __sync_lock_test_and_set (&a, 1);
       8  }
       9  
      10  /* { dg-final { scan-assembler-times "atom.exch" 1 } } */
      11