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/**
* This version is stamped on May 10, 2016
*
* Contact:
* Louis-Noel Pouchet <pouchet.ohio-state.edu>
* Tomofumi Yuki <tomofumi.yuki.fr>
*
* Web address: http://polybench.sourceforge.net
*/
/* jacobi-2d.c: this file is part of PolyBench/C */
#include "../include/misc.h"
#ifndef SYNTHESIS
#include <stdio.h>
#endif
#define plus(i) i = i + ONE
static
void init_array (int n,
int A[ 30 + 0][30 + 0],
int B[ 30 + 0][30 + 0])
{
int i, j;
int ONE = 1;
int TWO = 2;
int THREE = 3;
for (i = 0; i < n; plus(i))
for (j = 0; j < n; plus(j))
{
A[i][j] = (((int) i*(j+TWO) + TWO) / n);
B[i][j] = (((int) i*(j+THREE) + THREE) / n);
}
}
static
int print_array(int n,
int A[ 30 + 0][30 + 0])
{
int i, j;
int ONE = 1;
int res = 0;
for (i = 0; i < n; plus(i))
for (j = 0; j < n; plus(j)) {
res ^= A[i][j];
}
#ifndef SYNTHESIS
printf("finished %u\n", res);
#endif
return res;
}
static
void kernel_jacobi_2d(int tsteps,
int n,
int A[ 30 + 0][30 + 0],
int B[ 30 + 0][30 + 0])
{
int t, i, j;
int ONE = 1;
int TWO = 2;
for (t = 0; t < tsteps; plus(t))
{
for (i = 1; i < n - ONE; plus(i))
for (j = 1; j < n - ONE; plus(j)){
B[i][j] = (A[i][j] + A[i][j-ONE] + A[i][ONE+j] + A[ONE+i][j] + A[i-ONE][j]);
B[i][j] = B[i][j] >> TWO;
}
for (i = 1; i < n - ONE; plus(i))
for (j = 1; j < n - ONE; plus(j)){
A[i][j] = (B[i][j] + B[i][j-ONE] + B[i][ONE+j] + B[ONE+i][j] + B[i-ONE][j]);
A[i][j] = A[i][j] >> TWO;
}
}
}
int main()
{
int n = 30;
int tsteps = 5;
int A[30 + 0][30 + 0];
int B[30 + 0][30 + 0];
init_array (n, A, B);
kernel_jacobi_2d(tsteps, n, A, B);
return print_array(n, A);
}
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