1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
/* { dg-do run } */
/* { dg-require-effective-target offload_device_nonshared_as } */
#include <omp.h>
#include <stdlib.h>
#define EPS 0.000001
#define N 100000
#define THRESHOLD1 10000
#define THRESHOLD2 1000
void init (float *a1, float *a2)
{
float s = -1;
int i;
for (i = 0; i < N; i++)
{
a1[i] = s;
a2[i] = i;
s = -s;
}
}
void check (float *a, float *b)
{
int i;
for (i = 0; i < N; i++)
if (a[i] - b[i] > EPS || b[i] - a[i] > EPS)
abort ();
}
void vec_mult_ref (float *p, float *v1, float *v2)
{
int i;
for (i = 0; i < N; i++)
p[i] = v1[i] * v2[i];
}
void vec_mult (float *p, float *v1, float *v2)
{
int i;
#pragma omp target if(N > THRESHOLD1) map(to: v1[0:N], v2[:N]) \
map(from: p[0:N])
{
if (omp_is_initial_device ())
abort ();
#pragma omp parallel for if(N > THRESHOLD2)
for (i = 0; i < N; i++)
p[i] = v1[i] * v2[i];
}
}
int main ()
{
float p1[N], p2[N];
float v1[N], v2[N];
init (v1, v2);
vec_mult_ref (p1, v1, v2);
vec_mult (p2, v1, v2);
check (p1, p2);
return 0;
}
|
