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/*
* Test whether to include squaring code given the current settings
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <time.h>
#define MP_SQUARE 1 /* make sure squaring code is included */
#include "mpi.h"
#include "mpprime.h"
int
main(int argc, char *argv[])
{
int ntests, prec, ix;
unsigned int seed;
clock_t start, stop;
double multime, sqrtime;
mp_int a, c;
seed = (unsigned int)time(NULL);
if (argc < 3) {
fprintf(stderr, "Usage: %s <ntests> <nbits>\n", argv[0]);
return 1;
}
if ((ntests = abs(atoi(argv[1]))) == 0) {
fprintf(stderr, "%s: must request at least 1 test.\n", argv[0]);
return 1;
}
if ((prec = abs(atoi(argv[2]))) < CHAR_BIT) {
fprintf(stderr, "%s: must request at least %d bits.\n", argv[0],
CHAR_BIT);
return 1;
}
prec = (prec + (DIGIT_BIT - 1)) / DIGIT_BIT;
mp_init_size(&a, prec);
mp_init_size(&c, 2 * prec);
/* Test multiplication by self */
srand(seed);
start = clock();
for (ix = 0; ix < ntests; ix++) {
mpp_random_size(&a, prec);
mp_mul(&a, &a, &c);
}
stop = clock();
multime = (double)(stop - start) / CLOCKS_PER_SEC;
/* Test squaring */
srand(seed);
start = clock();
for (ix = 0; ix < ntests; ix++) {
mpp_random_size(&a, prec);
mp_sqr(&a, &c);
}
stop = clock();
sqrtime = (double)(stop - start) / CLOCKS_PER_SEC;
printf("Multiply: %.4f\n", multime);
printf("Square: %.4f\n", sqrtime);
if (multime < sqrtime) {
printf("Speedup: %.1f%%\n", 100.0 * (1.0 - multime / sqrtime));
printf("Prefer: multiply\n");
} else {
printf("Speedup: %.1f%%\n", 100.0 * (1.0 - sqrtime / multime));
printf("Prefer: square\n");
}
mp_clear(&a);
mp_clear(&c);
return 0;
}
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