1  /* { dg-do compile } */
       2  /* { dg-options "-O2 -fdump-tree-optimized" } */
       3  
       4  int
       5  foo (long a, unsigned long b)
       6  {
       7    return (a & (a == 0)) | (b & !b);
       8  }
       9  
      10  /* { dg-final { scan-tree-dump-times "return 0" 1 "optimized" } } */