1  /* { dg-do compile } */
       2  /* { dg-options "-O -fdump-tree-optimized" } */
       3  
       4  int x;
       5  void
       6  foo (void)
       7  {
       8    if (x == 0)
       9      x = 0;
      10  }
      11  void
      12  bar (int i)
      13  {
      14    if (x == i)
      15      x = i;
      16  }
      17  
      18  /* { dg-final { scan-tree-dump-not "x =" "optimized" } } */