1  /* { dg-do compile } */
       2  /* { dg-options "-O2 -fdump-tree-optimized" } */
       3  
       4  _Bool foo(_Bool x) { return (x << 2) != 0; }
       5  _Bool bar(_Bool x) { return (x << 2) == 0; }
       6  
       7  /* { dg-final { scan-tree-dump-not " << " "optimized" } } */