1  /* PR c++/71372 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-O2 -fdump-tree-optimized" } */
       4  
       5  void
       6  foo (volatile int *p, int q)
       7  {
       8    *(volatile int *)p = 0;
       9    *(p + (q - q) + 1) = 0;
      10    *(p + (q - q) + 2) = 0;
      11    *(p + (q - q) + 3) = 0;
      12  }
      13  
      14  /* { dg-final { scan-tree-dump-times " ={v} " 4 "optimized" } } */