1  /* { dg-do compile } */
       2  /* { dg-options "-O2 -mavx -mno-avx2" } */
       3  
       4  void
       5  foo_neg_const (int *a)
       6  {
       7    int i, b = 1;
       8  
       9    for (i = 0; i < 1000; i++)
      10      {
      11        a[i] = b;
      12        b = -b;
      13      }
      14  }