mirror of
https://github.com/Steffo99/unimore-hpc-assignments.git
synced 2024-11-27 02:24:22 +00:00
102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
|
#include <stdio.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <math.h>
|
||
|
|
|
||
|
|
/* Include polybench common header. */
|
||
|
|
#include <polybench.h>
|
||
|
|
|
||
|
|
/* Include benchmark-specific header. */
|
||
|
|
/* Default data type is double, default size is 4000. */
|
||
|
|
#include "cholesky.h"
|
||
|
|
|
||
|
|
/* Array initialization. */
|
||
|
|
static void init_array(int n,
|
||
|
|
DATA_TYPE POLYBENCH_1D(p, N, n),
|
||
|
|
DATA_TYPE POLYBENCH_2D(A, N, N, n, n))
|
||
|
|
{
|
||
|
|
int i, j;
|
||
|
|
|
||
|
|
for (i = 0; i < n; i++)
|
||
|
|
{
|
||
|
|
p[i] = 1.0 / n;
|
||
|
|
for (j = 0; j < n; j++)
|
||
|
|
A[i][j] = 1.0 / n;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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_2D(A, N, N, n, n))
|
||
|
|
|
||
|
|
{
|
||
|
|
int i, j;
|
||
|
|
|
||
|
|
for (i = 0; i < n; i++)
|
||
|
|
for (j = 0; j < n; j++)
|
||
|
|
{
|
||
|
|
fprintf(stderr, DATA_PRINTF_MODIFIER, A[i][j]);
|
||
|
|
if ((i * N + j) % 20 == 0)
|
||
|
|
fprintf(stderr, "\n");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Main computational kernel. The whole function will be timed,
|
||
|
|
including the call and return. */
|
||
|
|
static void kernel_cholesky(int n,
|
||
|
|
DATA_TYPE POLYBENCH_1D(p, N, n),
|
||
|
|
DATA_TYPE POLYBENCH_2D(A, N, N, n, n))
|
||
|
|
{
|
||
|
|
int i, j, k;
|
||
|
|
|
||
|
|
DATA_TYPE x;
|
||
|
|
for (i = 0; i < _PB_N; ++i)
|
||
|
|
{
|
||
|
|
x = A[i][i];
|
||
|
|
for (j = 0; j <= i - 1; ++j)
|
||
|
|
x = x - A[i][j] * A[i][j];
|
||
|
|
p[i] = 1.0 / sqrt(x);
|
||
|
|
for (j = i + 1; j < _PB_N; ++j)
|
||
|
|
{
|
||
|
|
x = A[i][j];
|
||
|
|
for (k = 0; k <= i - 1; ++k)
|
||
|
|
x = x - A[j][k] * A[i][k];
|
||
|
|
A[j][i] = x * p[i];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
/* Retrieve problem size. */
|
||
|
|
int n = N;
|
||
|
|
|
||
|
|
/* Variable declaration/allocation. */
|
||
|
|
POLYBENCH_2D_ARRAY_DECL(A, DATA_TYPE, N, N, n, n);
|
||
|
|
POLYBENCH_1D_ARRAY_DECL(p, DATA_TYPE, N, n);
|
||
|
|
|
||
|
|
/* Initialize array(s). */
|
||
|
|
init_array(n, POLYBENCH_ARRAY(p), POLYBENCH_ARRAY(A));
|
||
|
|
|
||
|
|
/* Start timer. */
|
||
|
|
polybench_start_instruments;
|
||
|
|
|
||
|
|
/* Run kernel. */
|
||
|
|
kernel_cholesky(n, POLYBENCH_ARRAY(p), POLYBENCH_ARRAY(A));
|
||
|
|
|
||
|
|
/* 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(A)));
|
||
|
|
|
||
|
|
/* Be clean. */
|
||
|
|
POLYBENCH_FREE_ARRAY(A);
|
||
|
|
POLYBENCH_FREE_ARRAY(p);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|