1  /* { dg-do compile } */ 
       2  /* { dg-options "-O1 -fdump-tree-optimized" } */
       3  
       4  extern void link_error (void);
       5  
       6  void
       7  foo (int b)
       8  {
       9    int a;
      10    a = b + 2;
      11    a--;
      12    a--;
      13    if (a != b)
      14      link_error ();
      15  }
      16  
      17  /* The comparison should be eliminated, there should be no reference
      18     to link_error.  */
      19  /* { dg-final { scan-tree-dump-times "link_error" 0 "optimized"} } */