mirror of
https://github.com/rn10950/RetroZilla.git
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133 lines
2.9 KiB
C
133 lines
2.9 KiB
C
/*
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* Simple test driver for MPI library
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*
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* Test 5a: Greatest common divisor speed test, binary vs. Euclid
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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 <string.h>
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#include <ctype.h>
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#include <limits.h>
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#include <time.h>
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#include <sys/time.h>
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#include "mpi.h"
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#include "mpprime.h"
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typedef struct {
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unsigned int sec;
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unsigned int usec;
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} instant_t;
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instant_t now(void)
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{
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struct timeval clk;
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instant_t res;
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res.sec = res.usec = 0;
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if(gettimeofday(&clk, NULL) != 0)
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return res;
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res.sec = clk.tv_sec;
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res.usec = clk.tv_usec;
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return res;
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}
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#define PRECISION 16
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int main(int argc, char *argv[])
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{
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int ix, num, prec = PRECISION;
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mp_int a, b, c, d;
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instant_t start, finish;
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time_t seed;
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unsigned int d1, d2;
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seed = time(NULL);
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if(argc < 2) {
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fprintf(stderr, "Usage: %s <num-tests>\n", argv[0]);
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return 1;
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}
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if((num = atoi(argv[1])) < 0)
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num = -num;
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printf("Test 5a: Euclid vs. Binary, a GCD speed test\n\n"
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"Number of tests: %d\n"
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"Precision: %d digits\n\n", num, prec);
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mp_init_size(&a, prec);
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mp_init_size(&b, prec);
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mp_init(&c);
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mp_init(&d);
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printf("Verifying accuracy ... \n");
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srand((unsigned int)seed);
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for(ix = 0; ix < num; ix++) {
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mpp_random_size(&a, prec);
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mpp_random_size(&b, prec);
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mp_gcd(&a, &b, &c);
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mp_bgcd(&a, &b, &d);
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if(mp_cmp(&c, &d) != 0) {
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printf("Error! Results not accurate:\n");
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printf("a = "); mp_print(&a, stdout); fputc('\n', stdout);
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printf("b = "); mp_print(&b, stdout); fputc('\n', stdout);
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printf("c = "); mp_print(&c, stdout); fputc('\n', stdout);
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printf("d = "); mp_print(&d, stdout); fputc('\n', stdout);
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mp_clear(&a); mp_clear(&b); mp_clear(&c); mp_clear(&d);
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return 1;
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}
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}
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mp_clear(&d);
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printf("Accuracy confirmed for the %d test samples\n", num);
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printf("Testing Euclid ... \n");
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srand((unsigned int)seed);
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start = now();
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for(ix = 0; ix < num; ix++) {
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mpp_random_size(&a, prec);
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mpp_random_size(&b, prec);
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mp_gcd(&a, &b, &c);
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}
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finish = now();
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d1 = (finish.sec - start.sec) * 1000000;
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d1 -= start.usec; d1 += finish.usec;
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printf("Testing binary ... \n");
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srand((unsigned int)seed);
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start = now();
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for(ix = 0; ix < num; ix++) {
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mpp_random_size(&a, prec);
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mpp_random_size(&b, prec);
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mp_bgcd(&a, &b, &c);
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}
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finish = now();
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d2 = (finish.sec - start.sec) * 1000000;
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d2 -= start.usec; d2 += finish.usec;
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printf("Euclidean algorithm time: %u usec\n", d1);
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printf("Binary algorithm time: %u usec\n", d2);
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printf("Improvement: %.2f%%\n",
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(1.0 - ((double)d2 / (double)d1)) * 100.0);
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mp_clear(&c);
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mp_clear(&b);
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mp_clear(&a);
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return 0;
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}
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