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
37 static void
err_exit(const char * msg)38 err_exit(const char *msg)
39 {
40 fprintf(stderr, "%s\n", msg);
41 exit(1);
42 }
43
44 static mpd_t *
new_mpd(void)45 new_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. */
57 static void
color_point(mpd_t * x0,mpd_t * y0,long maxiter,mpd_context_t * ctx)58 color_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
98 int
main(int argc,char ** argv)99 main(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