1/*
2 * Copyright (c) 2008-2020 Stefan Krah. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28
29#include "mpdecimal.h"
30
31#include <stdint.h>
32#include <stdio.h>
33#include <stdlib.h>
34#include <time.h>
35
36
37static void
38err_exit(const char *msg)
39{
40    fprintf(stderr, "%s\n", msg);
41    exit(1);
42}
43
44static mpd_t *
45new_mpd(void)
46{
47    mpd_t *x = mpd_qnew();
48    if (x == NULL) {
49        err_exit("out of memory");
50    }
51
52    return x;
53}
54
55/* Nonsense version of escape-time algorithm for calculating a mandelbrot
56 * set. Just for benchmarking. */
57static void
58color_point(mpd_t *x0, mpd_t *y0, long maxiter, mpd_context_t *ctx)
59{
60    mpd_t *x, *y, *sq_x, *sq_y;
61    mpd_t *two;
62
63    x = new_mpd();
64    y = new_mpd();
65    mpd_set_u32(x, 0, ctx);
66    mpd_set_u32(y, 0, ctx);
67
68    sq_x = new_mpd();
69    sq_y = new_mpd();
70    mpd_set_u32(sq_x, 0, ctx);
71    mpd_set_u32(sq_y, 0, ctx);
72
73    two = new_mpd();
74    mpd_set_u32(two, 2, ctx);
75
76    for (long i = 0; i < maxiter; i++) {
77        mpd_mul(y, x, y, ctx);
78        mpd_mul(y, y, two, ctx);
79        mpd_add(y, y, y0, ctx);
80
81        mpd_sub(x, sq_x, sq_y, ctx);
82        mpd_add(x, x, x0, ctx);
83
84        mpd_mul(sq_x, x, x, ctx);
85        mpd_mul(sq_y, y, y, ctx);
86    }
87
88    mpd_copy(x0, x, ctx);
89
90    mpd_del(two);
91    mpd_del(sq_y);
92    mpd_del(sq_x);
93    mpd_del(y);
94    mpd_del(x);
95}
96
97
98int
99main(int argc, char **argv)
100{
101    mpd_context_t ctx;
102    mpd_t *x0, *y0;
103    uint32_t prec = 19;
104    long iter = 10000000;
105    clock_t start_clock, end_clock;
106
107    if (argc != 3) {
108        err_exit("usage: bench prec iter\n");
109    }
110    prec = strtoul(argv[1], NULL, 10);
111    iter = strtol(argv[2], NULL, 10);
112
113    mpd_init(&ctx, prec);
114    /* no more MPD_MINALLOC changes after here */
115
116    x0 = new_mpd();
117    y0 = new_mpd();
118    mpd_set_string(x0, "0.222", &ctx);
119    mpd_set_string(y0, "0.333", &ctx);
120    if (ctx.status & MPD_Errors) {
121        mpd_del(y0);
122        mpd_del(x0);
123        err_exit("unexpected error during conversion");
124    }
125
126    start_clock = clock();
127    color_point(x0, y0, iter, &ctx);
128    end_clock = clock();
129
130    mpd_print(x0);
131    fprintf(stderr, "time: %f\n\n", (double)(end_clock-start_clock)/(double)CLOCKS_PER_SEC);
132
133    mpd_del(y0);
134    mpd_del(x0);
135
136    return 0;
137}
138