mirror of
https://github.com/rn10950/RetroZilla.git
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84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
/*
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* Test whether to include squaring code given the current settings
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <time.h>
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#define MP_SQUARE 1 /* make sure squaring code is included */
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#include "mpi.h"
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#include "mpprime.h"
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int main(int argc, char *argv[])
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{
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int ntests, prec, ix;
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unsigned int seed;
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clock_t start, stop;
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double multime, sqrtime;
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mp_int a, c;
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seed = (unsigned int)time(NULL);
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if(argc < 3) {
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fprintf(stderr, "Usage: %s <ntests> <nbits>\n", argv[0]);
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return 1;
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}
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if((ntests = abs(atoi(argv[1]))) == 0) {
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fprintf(stderr, "%s: must request at least 1 test.\n", argv[0]);
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return 1;
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}
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if((prec = abs(atoi(argv[2]))) < CHAR_BIT) {
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fprintf(stderr, "%s: must request at least %d bits.\n", argv[0],
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CHAR_BIT);
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return 1;
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}
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prec = (prec + (DIGIT_BIT - 1)) / DIGIT_BIT;
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mp_init_size(&a, prec);
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mp_init_size(&c, 2 * prec);
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/* Test multiplication by self */
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srand(seed);
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start = clock();
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for(ix = 0; ix < ntests; ix++) {
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mpp_random_size(&a, prec);
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mp_mul(&a, &a, &c);
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}
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stop = clock();
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multime = (double)(stop - start) / CLOCKS_PER_SEC;
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/* Test squaring */
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srand(seed);
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start = clock();
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for(ix = 0; ix < ntests; ix++) {
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mpp_random_size(&a, prec);
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mp_sqr(&a, &c);
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}
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stop = clock();
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sqrtime = (double)(stop - start) / CLOCKS_PER_SEC;
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printf("Multiply: %.4f\n", multime);
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printf("Square: %.4f\n", sqrtime);
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if(multime < sqrtime) {
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printf("Speedup: %.1f%%\n", 100.0 * (1.0 - multime / sqrtime));
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printf("Prefer: multiply\n");
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} else {
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printf("Speedup: %.1f%%\n", 100.0 * (1.0 - sqrtime / multime));
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printf("Prefer: square\n");
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}
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mp_clear(&a); mp_clear(&c);
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return 0;
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}
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