1  /* { dg-do compile } */
       2  /* { dg-options "-fno-tree-dce -ftree-vectorize" } */
       3  
       4  extern short X[];
       5  
       6  int foo (int len)
       7  {
       8    int i;
       9    int s = 0;
      10    for (i = 0; i < len; i++)
      11      s += X[i] * X[i];
      12    return s;
      13  }