1  /* { dg-do compile } */
       2  /* { dg-options "-O2 -fdump-tree-optimized" } */
       3  
       4  int
       5  foo (_Bool a, _Bool b)
       6  {
       7    return (a | !a) | (!b | b);
       8  }
       9  
      10  /* { dg-final { scan-tree-dump-times "return 1" 1 "optimized" } } */