1  /* { dg-do compile } */
       2  /* { dg-options "-O2 -ftree-tail-merge -fdump-tree-pre" } */
       3  
       4  int z;
       5  
       6  void
       7  foo (int y)
       8  {
       9    if (y == 6)
      10      z = 5;
      11    else
      12      z = 5;
      13  }
      14  
      15  /* { dg-final { scan-tree-dump-times "z = 5" 1 "pre"} } */