libgomp/testsuite/libgomp.c/examples-4/e.50.2.c

   1 /* { dg-do run } */
   2
   3 #include <stdlib.h>
   4
   5 #define N 100000
   6
   7 void init (char *a1, char *a2)
   8 {
   9   char s = -1;
  10   int i;
  11   for (i = 0; i < N; i++)
  12     {
  13       a1[i] = s;
  14       a2[i] = i;
  15       s = -s;
  16     }
  17 }
  18
  19 void check (char *a, char *b)
  20 {
  21   int i;
  22   for (i = 0; i < N; i++)
  23     if (a[i] != b[i])
  24       abort ();
  25 }
  26
  27 void vec_mult_ref (char *p)
  28 {
  29   int i;
  30   char v1[N], v2[N];
  31
  32   init (v1, v2);
  33
  34   for (i = 0; i < N; i++)
  35     p[i] = v1[i] * v2[i];
  36 }
  37
  38 void vec_mult (char *p)
  39 {
  40   int i;
  41   char v1[N], v2[N];
  42
  43   init (v1, v2);
  44
  45   #pragma omp target map(from: p[0:N])
  46     #pragma omp parallel for
  47       for (i = 0; i < N; i++)
  48         p[i] = v1[i] * v2[i];
  49 }
  50
  51 int main ()
  52 {
  53   char p1[N], p2[N];
  54   char v1[N], v2[N];
  55
  56   init (v1, v2);
  57
  58   vec_mult_ref (p1);
  59   vec_mult (p2);
  60
  61   check (p1, p2);
  62
  63   return 0;
  64 }