1  /* { dg-do run } */
       2  /* { dg-additional-options "-msse2" { target sse2_runtime } } */
       3  /* { dg-additional-options "-mavx" { target avx_runtime } } */
       4  
       5  #define N 100
       6  #define EPS 0.0000000000000001
       7  
       8  #include <stdlib.h>
       9  
      10  void init(double *a, double *a_ref, double *b, int n)
      11  {
      12    int i, s = -1;
      13    for ( i = 0; i < n; i++ )
      14    {
      15      a[i] = i*i*s;
      16      a_ref[i] = a[i];
      17      b[i] = i+i;
      18      s = -s;
      19    }
      20  }
      21  
      22  double work( double *a, double *b, int n )
      23  {
      24     int i;
      25     double tmp, sum;
      26     sum = 0.0;
      27     #pragma omp simd private(tmp) reduction(+:sum)
      28     for (i = 0; i < n; i++) {
      29        tmp = a[i] + b[i];
      30        sum += tmp;
      31     }
      32     return sum;
      33  }
      34  
      35  double work_ref( double *a, double *b, int n )
      36  {
      37     int i;
      38     double tmp, sum;
      39     sum = 0.0;
      40     for (i = 0; i < n; i++) {
      41        tmp = a[i] + b[i];
      42        sum += tmp;
      43     }
      44     return sum;
      45  }
      46  
      47  int main ()
      48  {
      49    double a[N], a_ref[N], b[N], res, ref, diff;
      50  
      51    init(a, a_ref, b, N);
      52  
      53    res = work(a, b, N);
      54    ref = work_ref(a_ref, b, N);
      55  
      56    diff = res - ref;
      57  
      58    if (diff > EPS || -diff > EPS)
      59      abort ();
      60  
      61    return 0;
      62  }