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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
*/
/* durbin.c: this file is part of PolyBench/C */
#define plus(i) i = i + ONE
/* Include polybench common header. */
static
void init_array (int n,
int r[ 40 + 0])
{
int ONE = 1;
int i, j;
for (i = 0; i < n; plus(i))
{
r[i] = (n+ONE-i);
}
}
static
int print_array(int n,
int y[ 40 + 0])
{
int ONE = 1;
int i;
int res = 0;
for (i = 0; i < n; plus(i)) {
res += y[i];
}
return res;
}
static
void kernel_durbin(int n,
int r[ 40 + 0],
int y[ 40 + 0])
{
int z[40];
int alpha;
int beta;
int sum;
int ONE = 1;
int i,k;
#pragma scop
y[0] = -r[0];
beta = 1;
alpha = -r[0];
for (k = 1; k < n; plus(k)) {
beta = (ONE-alpha*alpha)*beta;
sum = 0;
for (i=0; i<k; plus(i)) {
sum += r[k-i-ONE]*y[i];
}
alpha = - (r[k] + sum)/beta;
for (i=0; i<k; plus(i)) {
z[i] = y[i] + alpha*y[k-i-ONE];
}
for (i=0; i<k; plus(i)) {
y[i] = z[i];
}
y[k] = alpha;
}
#pragma endscop
}
int main()
{
int n = 40;
int r[40 + 0];
int y[40 + 0];
init_array (n, r);
kernel_durbin (n,
r,
y);
return print_array(n, y);
}
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