1  /* { dg-do compile } */
       2  /* { dg-additional-options "-Ofast" } */
       3  /* { dg-require-effective-target vect_double } */
       4  
       5  double a[1024], b[1024], c[1024];
       6  
       7  void foo()
       8  {
       9    for (int i = 0; i < 256; ++i)
      10      {
      11        a[2*i] = a[2*i] + b[2*i] - c[2*i];
      12        a[2*i+1] = a[2*i+1] - b[2*i+1] - c[2*i+1];
      13      }
      14  }
      15  
      16  /* { dg-final { scan-tree-dump "vectorizing stmts using SLP" "vect" } } */
      17  /* { dg-final { scan-tree-dump "Loop contains only SLP stmts" "vect" } } */