/*
 * Copyright (C) 2009, 2012 Thomas Preud'homme <thomas.preud-homme@lip6.fr>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <stdlib.h>
#include <stdio.h>


#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)


static int *mat, *vect;
static int li;
static int n, m; /* Size of the matrice: n lines, m columns */
static int *mat_cell_ptr;

int init_calc(int size)
{
	int i;

	n = size;
	m = size;
	srand(42);
	mat = (int *) malloc(n * m * sizeof(int));
	if (mat == NULL)
	{
		fprintf(stderr, "calc_mat: Unable to allocate memory for matrice calculation\n");
		return -1;
	}
	vect = (int *) malloc(m * sizeof(int));
	if (vect == NULL)
	{
		free(mat);
		fprintf(stderr, "calc_mat: Unable to allocate memory for matrice calculation\n");
		return -1;
	}
	for (i = 0; i < n * m; i++)
		mat[i] = rand();
	for (i = 0; i < m; i++)
		vect[i] = rand();
	li = 0;
	return 0;
}

void **do_calc(void)
{
	int co, p = 0;

	for (co = 0; co < m; co++)
		p += mat[li * m + co] * vect[li];
	mat[li * m] = p;
	if (unlikely(++li >= n))
		li = 0;
	mat_cell_ptr = &mat[li * m];
	return (void **) &mat_cell_ptr;
}

int end_calc(void)
{
	free(mat);
	free(vect);
	return 0;
}