1  /* { dg-do run } */
       2  /* { dg-additional-options "-ftree-vectorize" } */
       3  
       4  unsigned a[1024];
       5  unsigned b[1024];
       6  
       7  void __attribute__((noipa))
       8  foo (unsigned *q, unsigned *r)
       9  {
      10    unsigned sum1 = 0, sum2 = 0;
      11    for (int i = 0; i < 512; ++i)
      12      {
      13        sum1 += a[2*i];
      14        sum2 += a[2*i+1];
      15        b[2*i] = a[2*i+1];
      16        b[2*i+1] = a[2*i];
      17      }
      18    *q = sum1;
      19    *r = sum2;
      20  }
      21  
      22  int main()
      23  {
      24    unsigned sum1, sum2;
      25    a[0] = 0;
      26    a[1] = 1;
      27    foo (&sum1, &sum2);
      28    if (b[0] != 1 || b[1] != 0)
      29      __builtin_abort ();
      30    return 0;
      31  }