1  /* { dg-do run } */
       2  
       3  #include <stdlib.h>
       4  
       5  #define EPS 0.000001
       6  #define N 100000
       7  
       8  void init (double *a1, double *a2)
       9  {
      10    double s = -1;
      11    int i;
      12    for (i = 0; i < N; i++)
      13      {
      14        a1[i] = s;
      15        a2[i] = i;
      16        s = -s;
      17      }
      18  }
      19  
      20  void check (double *a, double *b)
      21  {
      22    int i;
      23    for (i = 0; i < N; i++)
      24      if (a[i] - b[i] > EPS || b[i] - a[i] > EPS)
      25        abort ();
      26  }
      27  
      28  void vec_mult_ref (double *p, double *v1, double *v2)
      29  {
      30    int i;
      31    for (i = 0; i < N; i++)
      32      p[i] = v1[i] * v2[i];
      33  }
      34  
      35  void vec_mult (double *p, double *v1, double *v2)
      36  {
      37    int i;
      38    #pragma omp target map(to: v1[0:N], v2[:N]) map(from: p[0:N])
      39      #pragma omp parallel for
      40        for (i = 0; i < N; i++)
      41  	p[i] = v1[i] * v2[i];
      42  }
      43  
      44  int main ()
      45  {
      46    double p1[N], p2[N];
      47    double v1[N], v2[N];
      48  
      49    init (v1, v2);
      50  
      51    vec_mult_ref (p1, v1, v2);
      52    vec_mult (p2, v1, v2);
      53  
      54    check (p1, p2);
      55  
      56    return 0;
      57  }