1  /* { dg-do compile } */
       2  /* { dg-options "-O1 -fdump-tree-optimized" } */
       3  
       4  int f(int x)
       5  {
       6    return ((~x) != 0);
       7  }
       8  int f1(int x)
       9  {
      10    return ((~x) == 0);
      11  }
      12  
      13  /* There should be no != 0 which is produced by the front-end as
      14     ~x != 0 is the same as x != -1 (or ~0).   Likewise for ==. */
      15  /* { dg-final { scan-tree-dump-times "!= 0" 0 "optimized"} } */
      16  /* { dg-final { scan-tree-dump-times "!= -1" 1 "optimized"} } */
      17  /* { dg-final { scan-tree-dump-times "== 0" 0 "optimized"} } */
      18  /* { dg-final { scan-tree-dump-times "== -1" 1 "optimized"} } */
      19  
      20