1  /* { dg-do compile } */
       2  /* { dg-options "-O3 --param tree-reassoc-width=4" } */
       3  /* { dg-additional-options "-mavx2" { target { x86_64-*-* i?86-*-* } } } */
       4  
       5  #define N 40
       6  #define M 128
       7  unsigned int in[N+M];
       8  unsigned short out[N];
       9  
      10  /* Outer-loop vectorization. */
      11  
      12  void
      13  foo (){
      14    int i,j;
      15    unsigned int diff;
      16  
      17    for (i = 0; i < N; i++) {
      18      diff = 0;
      19      for (j = 0; j < M; j+=8) {
      20        diff += in[j+i];
      21      }
      22      out[i]=(unsigned short)diff;
      23    }
      24  
      25    return;
      26  }