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https://github.com/Steffo99/unimore-hpc-assignments.git
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107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <math.h>
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/* Include polybench common header. */
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#include <polybench.h>
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/* Include benchmark-specific header. */
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/* Default data type is double, default size is 4000. */
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#include "atax.h"
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/* Array initialization. */
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static void init_array(int nx, int ny,
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DATA_TYPE POLYBENCH_2D(A, NX, NY, nx, ny),
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DATA_TYPE POLYBENCH_1D(x, NY, ny))
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{
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int i, j;
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for (i = 0; i < ny; i++)
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x[i] = i * M_PI;
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for (i = 0; i < nx; i++)
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for (j = 0; j < ny; j++)
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A[i][j] = ((DATA_TYPE)i * (j + 1)) / nx;
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}
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/* DCE code. Must scan the entire live-out data.
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Can be used also to check the correctness of the output. */
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static void print_array(int nx,
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DATA_TYPE POLYBENCH_1D(y, NX, nx))
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{
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int i;
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for (i = 0; i < nx; i++)
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{
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fprintf(stderr, DATA_PRINTF_MODIFIER, y[i]);
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if (i % 20 == 0)
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fprintf(stderr, "\n");
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}
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fprintf(stderr, "\n");
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}
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/* Main computational kernel. The whole function will be timed,
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including the call and return. */
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static void kernel_atax(int nx, int ny,
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DATA_TYPE POLYBENCH_2D(A, NX, NY, nx, ny),
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DATA_TYPE POLYBENCH_1D(x, NY, ny),
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DATA_TYPE POLYBENCH_1D(y, NY, ny),
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DATA_TYPE POLYBENCH_1D(tmp, NX, nx))
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{
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int i, j;
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for (i = 0; i < _PB_NY; i++)
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y[i] = 0;
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for (i = 0; i < _PB_NX; i++)
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{
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tmp[i] = 0;
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for (j = 0; j < _PB_NY; j++)
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tmp[i] = tmp[i] + A[i][j] * x[j];
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for (j = 0; j < _PB_NY; j++)
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y[j] = y[j] + A[i][j] * tmp[i];
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}
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}
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int main(int argc, char **argv)
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{
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/* Retrieve problem size. */
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int nx = NX;
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int ny = NY;
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/* Variable declaration/allocation. */
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POLYBENCH_2D_ARRAY_DECL(A, DATA_TYPE, NX, NY, nx, ny);
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POLYBENCH_1D_ARRAY_DECL(x, DATA_TYPE, NY, ny);
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POLYBENCH_1D_ARRAY_DECL(y, DATA_TYPE, NY, ny);
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POLYBENCH_1D_ARRAY_DECL(tmp, DATA_TYPE, NX, nx);
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/* Initialize array(s). */
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init_array(nx, ny, POLYBENCH_ARRAY(A), POLYBENCH_ARRAY(x));
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/* Start timer. */
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polybench_start_instruments;
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/* Run kernel. */
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kernel_atax(nx, ny,
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POLYBENCH_ARRAY(A),
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POLYBENCH_ARRAY(x),
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POLYBENCH_ARRAY(y),
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POLYBENCH_ARRAY(tmp));
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/* Stop and print timer. */
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polybench_stop_instruments;
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polybench_print_instruments;
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/* Prevent dead-code elimination. All live-out data must be printed
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by the function call in argument. */
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polybench_prevent_dce(print_array(nx, POLYBENCH_ARRAY(y)));
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/* Be clean. */
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POLYBENCH_FREE_ARRAY(A);
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POLYBENCH_FREE_ARRAY(x);
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POLYBENCH_FREE_ARRAY(y);
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POLYBENCH_FREE_ARRAY(tmp);
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return 0;
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}
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