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opt-meas.c
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151 lines (128 loc) · 2.45 KB
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#include <stdio.h>
#include <stdlib.h>
#include "cpe.h"
/*
* Compute product of a set of array elements.
* Function unrolls loops by 3.
*/
/* $begin opt-aprod-c */
double aprod(double a[], long n)
{
long i;
double x, y, z;
double r = 1;
for (i = 0; i < n-2; i+= 3) {
x = a[i]; y = a[i+1]; z = a[i+2];
r = r * x * y * z; /* Product computation */
}
for (; i < n; i++)
r *= a[i];
return r;
}
/* $end opt-aprod-c */
double aprod1(double a[], long n)
{
long i;
double x, y, z;
double r = 1;
for (i = 0; i < n; i+= 3) {
x = a[i]; y = a[i+1]; z = a[i+2];
/* $begin opt-assoc-c */
r = ((r * x) * y) * z; /* A1 */
/* $end opt-assoc-c */
}
for (; i < n; i++)
r *= a[i];
return r;
}
double aprod2(double a[], long n)
{
long i;
double x, y, z;
double r = 1;
for (i = 0; i < n; i+= 3) {
x = a[i]; y = a[i+1]; z = a[i+2];
/* $begin opt-assoc-c */
r = (r * (x * y)) * z; /* A2 */
/* $end opt-assoc-c */
}
for (; i < n; i++)
r *= a[i];
return r;
}
double aprod3(double a[], long n)
{
long i;
double x, y, z;
double r = 1;
for (i = 0; i < n; i+= 3) {
x = a[i]; y = a[i+1]; z = a[i+2];
/* $begin opt-assoc-c */
r = r * ((x * y) * z); /* A3 */
/* $end opt-assoc-c */
}
for (; i < n; i++)
r *= a[i];
return r;
}
double aprod4(double a[], long n)
{
long i;
double x, y, z;
double r = 1;
for (i = 0; i < n; i+= 3) {
x = a[i]; y = a[i+1]; z = a[i+2];
/* $begin opt-assoc-c */
r = r * (x * (y * z)); /* A4 */
/* $end opt-assoc-c */
}
for (; i < n; i++)
r *= a[i];
return r;
}
double aprod5(double a[], long n)
{
long i;
double x, y, z;
double r = 1;
for (i = 0; i < n; i+= 3) {
x = a[i]; y = a[i+1]; z = a[i+2];
/* $begin opt-assoc-c */
r = (r * x) * (y * z); /* A5 */
/* $end opt-assoc-c */
}
for (; i < n; i++)
r *= a[i];
return r;
}
volatile double sink = 0;
#define SIZE 1024
double a[SIZE];
void t1(long n)
{
sink = aprod1(a, n);
}
void t2(long n)
{
sink = aprod2(a, n);
}
void t3(long n)
{
sink = aprod3(a, n);
}
void t4(long n)
{
sink = aprod4(a, n);
}
void t5(long n)
{
sink = aprod5(a, n);
}
int main() {
printf("A1 CPE = %.2f\n", find_cpe(t1, SIZE));
printf("A2 CPE = %.2f\n", find_cpe(t2, SIZE));
printf("A3 CPE = %.2f\n", find_cpe(t3, SIZE));
printf("A4 CPE = %.2f\n", find_cpe(t4, SIZE));
printf("A5 CPE = %.2f\n", find_cpe(t5, SIZE));
return 0;
}