1 | /* Measure memchr functions. |
2 | Copyright (C) 2013-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #ifndef WIDE |
20 | # define SMALL_CHAR 127 |
21 | #else |
22 | # define SMALL_CHAR 1273 |
23 | #endif /* WIDE */ |
24 | |
25 | #ifndef USE_AS_MEMRCHR |
26 | # define TEST_MAIN |
27 | # ifndef WIDE |
28 | # define TEST_NAME "memchr" |
29 | # else |
30 | # define TEST_NAME "wmemchr" |
31 | # endif /* WIDE */ |
32 | # include "bench-string.h" |
33 | |
34 | # ifndef WIDE |
35 | # define SIMPLE_MEMCHR simple_memchr |
36 | # else |
37 | # define SIMPLE_MEMCHR simple_wmemchr |
38 | # endif /* WIDE */ |
39 | |
40 | typedef CHAR *(*proto_t) (const CHAR *, int, size_t); |
41 | CHAR *SIMPLE_MEMCHR (const CHAR *, int, size_t); |
42 | |
43 | IMPL (SIMPLE_MEMCHR, 0) |
44 | IMPL (MEMCHR, 1) |
45 | |
46 | CHAR * |
47 | SIMPLE_MEMCHR (const CHAR *s, int c, size_t n) |
48 | { |
49 | while (n--) |
50 | if (*s++ == (CHAR) c) |
51 | return (CHAR *) s - 1; |
52 | return NULL; |
53 | } |
54 | #endif /* !USE_AS_MEMRCHR */ |
55 | |
56 | static void |
57 | do_one_test (impl_t *impl, const CHAR *s, int c, size_t n) |
58 | { |
59 | size_t i, iters = INNER_LOOP_ITERS_LARGE; |
60 | timing_t start, stop, cur; |
61 | |
62 | TIMING_NOW (start); |
63 | for (i = 0; i < iters; ++i) |
64 | { |
65 | CALL (impl, s, c, n); |
66 | } |
67 | TIMING_NOW (stop); |
68 | |
69 | TIMING_DIFF (cur, start, stop); |
70 | |
71 | TIMING_PRINT_MEAN ((double) cur, (double) iters); |
72 | } |
73 | |
74 | static void |
75 | do_test (size_t align, size_t pos, size_t len, int seek_char) |
76 | { |
77 | size_t i; |
78 | |
79 | align &= 7; |
80 | if ((align + len) * sizeof (CHAR) >= page_size) |
81 | return; |
82 | |
83 | CHAR *buf = (CHAR *) (buf1); |
84 | |
85 | for (i = 0; i < len; ++i) |
86 | { |
87 | buf[align + i] = 1 + 23 * i % SMALL_CHAR; |
88 | if (buf[align + i] == seek_char) |
89 | buf[align + i] = seek_char + 1; |
90 | } |
91 | buf[align + len] = 0; |
92 | |
93 | if (pos < len) |
94 | { |
95 | buf[align + pos] = seek_char; |
96 | buf[align + len] = -seek_char; |
97 | } |
98 | else |
99 | { |
100 | buf[align + len] = seek_char; |
101 | } |
102 | |
103 | printf (format: "Length %4zd, position %4zd, alignment %2zd:" , |
104 | len, pos, align); |
105 | |
106 | FOR_EACH_IMPL (impl, 0) |
107 | do_one_test (impl, s: (CHAR *) (buf + align), c: seek_char, n: len); |
108 | |
109 | putchar (c: '\n'); |
110 | } |
111 | |
112 | int |
113 | test_main (void) |
114 | { |
115 | size_t i; |
116 | |
117 | test_init (); |
118 | |
119 | printf (format: "%20s" , "" ); |
120 | FOR_EACH_IMPL (impl, 0) |
121 | printf (format: "\t%s" , impl->name); |
122 | putchar (c: '\n'); |
123 | |
124 | for (i = 1; i < 8; ++i) |
125 | { |
126 | do_test (align: 0, pos: 16 << i, len: 2048, seek_char: 23); |
127 | do_test (align: i, pos: 64, len: 256, seek_char: 23); |
128 | do_test (align: 0, pos: 16 << i, len: 2048, seek_char: 0); |
129 | do_test (align: i, pos: 64, len: 256, seek_char: 0); |
130 | #ifdef USE_AS_MEMRCHR |
131 | /* Also test the position close to the beginning for memrchr. */ |
132 | do_test (0, i, 256, 23); |
133 | do_test (0, i, 256, 0); |
134 | do_test (i, i, 256, 23); |
135 | do_test (i, i, 256, 0); |
136 | #endif |
137 | } |
138 | for (i = 1; i < 8; ++i) |
139 | { |
140 | do_test (align: i, pos: i << 5, len: 192, seek_char: 23); |
141 | do_test (align: i, pos: i << 5, len: 192, seek_char: 0); |
142 | do_test (align: i, pos: i << 5, len: 256, seek_char: 23); |
143 | do_test (align: i, pos: i << 5, len: 256, seek_char: 0); |
144 | do_test (align: i, pos: i << 5, len: 512, seek_char: 23); |
145 | do_test (align: i, pos: i << 5, len: 512, seek_char: 0); |
146 | } |
147 | for (i = 1; i < 32; ++i) |
148 | { |
149 | do_test (align: 0, pos: i, len: i + 1, seek_char: 23); |
150 | do_test (align: 0, pos: i, len: i + 1, seek_char: 0); |
151 | do_test (align: i, pos: i, len: i + 1, seek_char: 23); |
152 | do_test (align: i, pos: i, len: i + 1, seek_char: 0); |
153 | do_test (align: 0, pos: i, len: i - 1, seek_char: 23); |
154 | do_test (align: 0, pos: i, len: i - 1, seek_char: 0); |
155 | do_test (align: i, pos: i, len: i - 1, seek_char: 23); |
156 | do_test (align: i, pos: i, len: i - 1, seek_char: 0); |
157 | #ifdef USE_AS_MEMRCHR |
158 | /* Also test the position close to the beginning for memrchr. */ |
159 | do_test (0, 1, i + 1, 23); |
160 | do_test (0, 2, i + 1, 0); |
161 | #endif |
162 | } |
163 | |
164 | return ret; |
165 | } |
166 | |
167 | #include <support/test-driver.c> |
168 | |