1 | /* |
2 | * Copyright © 2012 Intel Corporation |
3 | * |
4 | * Permission is hereby granted, free of charge, to any person obtaining |
5 | * a copy of this software and associated documentation files (the |
6 | * "Software"), to deal in the Software without restriction, including |
7 | * without limitation the rights to use, copy, modify, merge, publish, |
8 | * distribute, sublicense, and/or sell copies of the Software, and to |
9 | * permit persons to whom the Software is furnished to do so, subject to |
10 | * the following conditions: |
11 | * |
12 | * The above copyright notice and this permission notice (including the |
13 | * next paragraph) shall be included in all copies or substantial |
14 | * portions of the Software. |
15 | * |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
20 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
21 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
22 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
23 | * SOFTWARE. |
24 | */ |
25 | |
26 | #include <stdlib.h> |
27 | #include <stdio.h> |
28 | #include <string.h> |
29 | #include <time.h> |
30 | #include <assert.h> |
31 | #include "wayland-private.h" |
32 | |
33 | volatile double global_d; |
34 | |
35 | static void |
36 | noop_conversion(void) |
37 | { |
38 | wl_fixed_t f; |
39 | union { |
40 | int64_t i; |
41 | double d; |
42 | } u; |
43 | |
44 | for (f = 0; f < INT32_MAX; f++) { |
45 | u.i = f; |
46 | global_d = u.d; |
47 | } |
48 | } |
49 | |
50 | static void |
51 | magic_conversion(void) |
52 | { |
53 | wl_fixed_t f; |
54 | |
55 | for (f = 0; f < INT32_MAX; f++) |
56 | global_d = wl_fixed_to_double(f); |
57 | } |
58 | |
59 | static void |
60 | mul_conversion(void) |
61 | { |
62 | wl_fixed_t f; |
63 | |
64 | /* This will get optimized into multiplication by 1/256 */ |
65 | for (f = 0; f < INT32_MAX; f++) |
66 | global_d = f / 256.0; |
67 | } |
68 | |
69 | double factor = 256.0; |
70 | |
71 | static void |
72 | div_conversion(void) |
73 | { |
74 | wl_fixed_t f; |
75 | |
76 | for (f = 0; f < INT32_MAX; f++) |
77 | global_d = f / factor; |
78 | } |
79 | |
80 | static void |
81 | benchmark(const char *s, void (*f)(void)) |
82 | { |
83 | struct timespec start, stop, elapsed; |
84 | |
85 | clock_gettime(CLOCK_MONOTONIC, tp: &start); |
86 | f(); |
87 | clock_gettime(CLOCK_MONOTONIC, tp: &stop); |
88 | |
89 | elapsed.tv_sec = stop.tv_sec - start.tv_sec; |
90 | elapsed.tv_nsec = stop.tv_nsec - start.tv_nsec; |
91 | if (elapsed.tv_nsec < 0) { |
92 | elapsed.tv_nsec += 1000000000; |
93 | elapsed.tv_sec--; |
94 | } |
95 | printf(format: "benchmarked %s:\t%ld.%09lds\n" , |
96 | s, elapsed.tv_sec, elapsed.tv_nsec); |
97 | } |
98 | |
99 | int main(void) |
100 | { |
101 | benchmark(s: "noop" , f: noop_conversion); |
102 | benchmark(s: "magic" , f: magic_conversion); |
103 | benchmark(s: "div" , f: div_conversion); |
104 | benchmark(s: "mul" , f: mul_conversion); |
105 | |
106 | return 0; |
107 | } |
108 | |