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137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
/*
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* Copyright (c) 2008-2020 Stefan Krah. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "mpdecimal.h"
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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static void
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err_exit(const char *msg)
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{
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fprintf(stderr, "%s\n", msg);
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exit(1);
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}
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static mpd_t *
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new_mpd(void)
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{
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mpd_t *x = mpd_qnew();
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if (x == NULL) {
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err_exit("out of memory");
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}
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return x;
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}
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/* Nonsense version of escape-time algorithm for calculating a mandelbrot
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* set. Just for benchmarking. */
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static void
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color_point(mpd_t *x0, mpd_t *y0, long maxiter, mpd_context_t *ctx)
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{
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mpd_t *x, *y, *sq_x, *sq_y;
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mpd_t *two;
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x = new_mpd();
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y = new_mpd();
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mpd_set_u32(x, 0, ctx);
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mpd_set_u32(y, 0, ctx);
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sq_x = new_mpd();
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sq_y = new_mpd();
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mpd_set_u32(sq_x, 0, ctx);
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mpd_set_u32(sq_y, 0, ctx);
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two = new_mpd();
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mpd_set_u32(two, 2, ctx);
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for (long i = 0; i < maxiter; i++) {
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mpd_mul(y, x, y, ctx);
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mpd_mul(y, y, two, ctx);
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mpd_add(y, y, y0, ctx);
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mpd_sub(x, sq_x, sq_y, ctx);
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mpd_add(x, x, x0, ctx);
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mpd_mul(sq_x, x, x, ctx);
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mpd_mul(sq_y, y, y, ctx);
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}
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mpd_copy(x0, x, ctx);
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mpd_del(two);
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mpd_del(sq_y);
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mpd_del(sq_x);
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mpd_del(y);
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mpd_del(x);
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}
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int
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main(int argc, char **argv)
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{
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mpd_context_t ctx;
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mpd_t *x0, *y0;
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uint32_t prec = 19;
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long iter = 10000000;
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clock_t start_clock, end_clock;
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if (argc != 3) {
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err_exit("usage: bench prec iter\n");
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}
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prec = strtoul(argv[1], NULL, 10);
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iter = strtol(argv[2], NULL, 10);
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mpd_init(&ctx, prec);
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/* no more MPD_MINALLOC changes after here */
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x0 = new_mpd();
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y0 = new_mpd();
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mpd_set_string(x0, "0.222", &ctx);
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mpd_set_string(y0, "0.333", &ctx);
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if (ctx.status & MPD_Errors) {
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mpd_del(y0);
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mpd_del(x0);
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err_exit("unexpected error during conversion");
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}
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start_clock = clock();
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color_point(x0, y0, iter, &ctx);
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end_clock = clock();
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mpd_print(x0);
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fprintf(stderr, "time: %f\n\n", (double)(end_clock-start_clock)/(double)CLOCKS_PER_SEC);
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mpd_del(y0);
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mpd_del(x0);
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return 0;
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}
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