1  /* { dg-do compile } */
       2  /* { dg-options "-O -ftree-vectorize -mavx2" } */
       3  
       4  long foo (long *p, int i)
       5  {
       6    long x = 0;
       7  
       8    while (--i)
       9      x ^= p[i];
      10  
      11    return x;
      12  }