Viewing file:  simd-1.c (1.11 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-additional-options "-msse2" { target sse2_runtime } } */
/* { dg-additional-options "-mavx" { target avx_runtime } } */
#define N 100
#define OFF 32
#define EPS 0.0000000000000001
#include <stdlib.h>
void init(double *a, double *a_ref, double *b, double *c, int n, int ioff)
{
int i;
for ( i = 0; i < n; i++ )
{
a[i] = i*i;
a_ref[i] = a[i];
b[i] = i+i;
}
int s = -1;
for ( i = 0; i < n+ioff; i++ )
{
c[i] = s*3;
s = -s;
}
}
void star( double *a, double *b, double *c, int n, int *ioff )
{
int i;
#pragma omp simd
for ( i = 0; i < n; i++ )
a[i] *= b[i] * c[i+ *ioff];
}
void star_ref( double *a, double *b, double *c, int n, int *ioff )
{
int i;
for ( i = 0; i < n; i++ )
a[i] *= b[i] * c[i+ *ioff];
}
void check (double *a, double *b)
{
int i;
for (i = 0; i < N; i++)
if (a[i] - b[i] > EPS || b[i] - a[i] > EPS)
abort ();
}
int main ()
{
double a[N], a_ref[N], b[N], c[N+OFF];
int ioff = OFF;
init(a, a_ref, b, c, N, ioff);
star(a, b, c, N, &ioff);
star_ref(a_ref, b, c, N, &ioff);
check(a, a_ref);
return 0;
}
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