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https://github.com/Steffo99/unimore-hpc-assignments.git
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102 lines
2.3 KiB
C
102 lines
2.3 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 "cholesky.h"
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/* Array initialization. */
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static void init_array(int n,
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DATA_TYPE POLYBENCH_1D(p, N, n),
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DATA_TYPE POLYBENCH_2D(A, N, N, n, n))
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{
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int i, j;
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for (i = 0; i < n; i++)
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{
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p[i] = 1.0 / n;
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for (j = 0; j < n; j++)
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A[i][j] = 1.0 / n;
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}
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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 n,
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DATA_TYPE POLYBENCH_2D(A, N, N, n, n))
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{
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int i, j;
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for (i = 0; i < n; i++)
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for (j = 0; j < n; j++)
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{
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fprintf(stderr, DATA_PRINTF_MODIFIER, A[i][j]);
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if ((i * N + j) % 20 == 0)
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fprintf(stderr, "\n");
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}
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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_cholesky(int n,
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DATA_TYPE POLYBENCH_1D(p, N, n),
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DATA_TYPE POLYBENCH_2D(A, N, N, n, n))
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{
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int i, j, k;
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DATA_TYPE x;
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for (i = 0; i < _PB_N; ++i)
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{
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x = A[i][i];
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for (j = 0; j <= i - 1; ++j)
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x = x - A[i][j] * A[i][j];
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p[i] = 1.0 / sqrt(x);
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for (j = i + 1; j < _PB_N; ++j)
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{
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x = A[i][j];
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for (k = 0; k <= i - 1; ++k)
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x = x - A[j][k] * A[i][k];
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A[j][i] = x * p[i];
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}
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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 n = N;
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/* Variable declaration/allocation. */
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POLYBENCH_2D_ARRAY_DECL(A, DATA_TYPE, N, N, n, n);
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POLYBENCH_1D_ARRAY_DECL(p, DATA_TYPE, N, n);
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/* Initialize array(s). */
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init_array(n, POLYBENCH_ARRAY(p), POLYBENCH_ARRAY(A));
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/* Start timer. */
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polybench_start_instruments;
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/* Run kernel. */
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kernel_cholesky(n, POLYBENCH_ARRAY(p), POLYBENCH_ARRAY(A));
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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(n, POLYBENCH_ARRAY(A)));
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/* Be clean. */
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POLYBENCH_FREE_ARRAY(A);
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POLYBENCH_FREE_ARRAY(p);
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return 0;
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}
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