1  /* PR c/33238 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-std=gnu89" } */
       4  /* { dg-require-effective-target alloca } */
       5  
       6  void
       7  reverse (void *x, int y, int z)
       8  {
       9    struct { char w[z]; } *p = x, a;
      10    int i, j;
      11    for (i = y - 1, j = 0; j < y / 2; i--, j++)
      12      ({ a = p[i]; p[i] = p[j]; p[j] = a; });
      13  }