1  /* { dg-do compile } */
       2  /* { dg-options "-O2 -fdump-tree-optimized" } */
       3  
       4  void f (const char *c, int *i)
       5  {
       6    *i = 42;
       7    __builtin_memcpy (i + 1, c, sizeof (int));
       8    if (*i != 42) __builtin_abort();
       9  }
      10  
      11  extern void keepit ();
      12  void g (const char *c, int *i)
      13  {
      14    *i = 33;
      15    __builtin_memcpy (i - 1, c, 3 * sizeof (int));
      16    if (*i != 33) keepit();
      17  }
      18  
      19  /* { dg-final { scan-tree-dump-not "abort" "optimized" } } */
      20  /* { dg-final { scan-tree-dump "keepit" "optimized" } } */
      21