1  /* PR c/86093 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-O2 -fdump-tree-optimized" } */
       4  /* { dg-final { scan-tree-dump-not "return 0;" "optimized" } } */
       5  
       6  char *volatile p;
       7  
       8  __PTRDIFF_TYPE__
       9  foo (void)
      10  {
      11    return p - p;
      12  }