1  /* { dg-do compile } */
       2  /* { dg-options "-O1 -fdump-tree-optimized" } */
       3  
       4  int f(_Bool x)
       5  {
       6    return (x == 0);
       7  }
       8  
       9  /* There should be no == 0 which is produced by the front-end as
      10     bool_var == 0 is the same as !bool_var. */
      11  /* { dg-final { scan-tree-dump-times "== 0" 0 "optimized"} } */
      12  /* { dg-final { scan-tree-dump-times "~x" 1 "optimized"} } */
      13