1  /* PR tree-optimization/21658
       2     CCP did not propagate an ADDR_EXPR far enough, preventing the "if"
       3     statement below from being folded.  */
       4  
       5  /* { dg-do compile } */
       6  /* { dg-options "-O2 -fno-tree-dominator-opts -fdump-tree-ccp1-details" } */
       7  
       8  void link_error (void);
       9  
      10  void
      11  f (void)
      12  {
      13    int a[10];
      14    int *p = &a[5];
      15    int *q = p - 1;
      16    if (q != &a[4])
      17      link_error ();
      18  }
      19  
      20  /* { dg-final { scan-tree-dump-times "Folded into: if " 1 "ccp1"} } */