1  /* { dg-do compile } */
       2  /* { dg-options "-O -ftree-loop-vectorize -fdump-tree-vect-details -fno-tree-loop-im -msse2 -mno-avx" } */
       3  
       4  double x[1024][1024], red[1024];
       5  void foo (void)
       6  {
       7    for (int i = 0; i < 1024; ++i)
       8      for (int j = 0; j < 1024; ++j)
       9        {
      10  	double v = i == 0 ? 0.0 : red[j];
      11  	v = v + x[i][j];
      12  	red[j] = v;
      13        }
      14  }
      15  
      16  /* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" } } */