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atax.c
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atax.c
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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
*/
/* atax.c: this file is part of PolyBench/C */
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
/* Include polybench common header. */
#include <polybench.h>
/* Include benchmark-specific header. */
#include "atax.h"
/* Array initialization. */
static
void init_array (int m, int n,
DATA_TYPE POLYBENCH_2D(A,M,N,m,n),
DATA_TYPE POLYBENCH_1D(x,N,n))
{
int i, j;
DATA_TYPE fn;
fn = (DATA_TYPE)n;
for (i = 0; i < n; i++)
x[i] = 1 + (i / fn);
for (i = 0; i < m; i++)
for (j = 0; j < n; j++)
A[i][j] = (DATA_TYPE) ((i+j) % n) / (5*m);
}
/* DCE code. Must scan the entire live-out data.
Can be used also to check the correctness of the output. */
static
void print_array(int n,
DATA_TYPE POLYBENCH_1D(y,N,n))
{
int i;
POLYBENCH_DUMP_START;
POLYBENCH_DUMP_BEGIN("y");
for (i = 0; i < n; i++) {
if (i % 20 == 0) fprintf (POLYBENCH_DUMP_TARGET, "\n");
fprintf (POLYBENCH_DUMP_TARGET, DATA_PRINTF_MODIFIER, y[i]);
}
POLYBENCH_DUMP_END("y");
POLYBENCH_DUMP_FINISH;
}
/* Main computational kernel. The whole function will be timed,
including the call and return. */
static
void kernel_atax(int m, int n,
DATA_TYPE POLYBENCH_2D(A,M,N,m,n),
DATA_TYPE POLYBENCH_1D(x,N,n),
DATA_TYPE POLYBENCH_1D(y,N,n),
DATA_TYPE POLYBENCH_1D(tmp,M,m))
{
int i, j;
#pragma scop
for (i = 0; i < _PB_N; i++)
y[i] = 0;
for (i = 0; i < _PB_M; i++)
{
tmp[i] = SCALAR_VAL(0.0);
for (j = 0; j < _PB_N; j++)
tmp[i] = tmp[i] + A[i][j] * x[j];
for (j = 0; j < _PB_N; j++)
y[j] = y[j] + A[i][j] * tmp[i];
}
#pragma endscop
}
int main(int argc, char** argv)
{
/* Retrieve problem size. */
int m = M;
int n = N;
/* Variable declaration/allocation. */
POLYBENCH_2D_ARRAY_DECL(A, DATA_TYPE, M, N, m, n);
POLYBENCH_1D_ARRAY_DECL(x, DATA_TYPE, N, n);
POLYBENCH_1D_ARRAY_DECL(y, DATA_TYPE, N, n);
POLYBENCH_1D_ARRAY_DECL(tmp, DATA_TYPE, M, m);
/* Initialize array(s). */
init_array (m, n, POLYBENCH_ARRAY(A), POLYBENCH_ARRAY(x));
/* Start timer. */
polybench_start_instruments;
/* Run kernel. */
kernel_atax (m, n,
POLYBENCH_ARRAY(A),
POLYBENCH_ARRAY(x),
POLYBENCH_ARRAY(y),
POLYBENCH_ARRAY(tmp));
/* Stop and print timer. */
polybench_stop_instruments;
polybench_print_instruments;
/* Prevent dead-code elimination. All live-out data must be printed
by the function call in argument. */
polybench_prevent_dce(print_array(n, POLYBENCH_ARRAY(y)));
/* Be clean. */
POLYBENCH_FREE_ARRAY(A);
POLYBENCH_FREE_ARRAY(x);
POLYBENCH_FREE_ARRAY(y);
POLYBENCH_FREE_ARRAY(tmp);
return 0;
}