1 /* Measure memchr functions.
2 Copyright (C) 2013-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
20 # define SMALL_CHAR 127
22 # define SMALL_CHAR 1273
25 #ifndef USE_AS_MEMRCHR
28 # define TEST_NAME "memchr"
30 # define TEST_NAME "wmemchr"
32 # include "bench-string.h"
35 # define SIMPLE_MEMCHR simple_memchr
37 # define SIMPLE_MEMCHR simple_wmemchr
40 typedef CHAR *(*proto_t) (const CHAR *, int, size_t);
41 CHAR *SIMPLE_MEMCHR (const CHAR *, int, size_t);
43 IMPL (SIMPLE_MEMCHR, 0)
47 SIMPLE_MEMCHR (const CHAR *s, int c, size_t n)
51 return (CHAR *) s - 1;
54 #endif /* !USE_AS_MEMRCHR */
57 do_one_test (impl_t *impl, const CHAR *s, int c, size_t n)
59 size_t i, iters = INNER_LOOP_ITERS_LARGE;
60 timing_t start, stop, cur;
63 for (i = 0; i < iters; ++i)
69 TIMING_DIFF (cur, start, stop);
71 TIMING_PRINT_MEAN ((double) cur, (double) iters);
75 do_test (size_t align, size_t pos, size_t len, int seek_char)
80 if ((align + len) * sizeof (CHAR) >= page_size)
83 CHAR *buf = (CHAR *) (buf1);
85 for (i = 0; i < len; ++i)
87 buf[align + i] = 1 + 23 * i % SMALL_CHAR;
88 if (buf[align + i] == seek_char)
89 buf[align + i] = seek_char + 1;
95 buf[align + pos] = seek_char;
96 buf[align + len] = -seek_char;
100 buf[align + len] = seek_char;
103 printf ("Length %4zd, position %4zd, alignment %2zd:",
106 FOR_EACH_IMPL (impl, 0)
107 do_one_test (impl, (CHAR *) (buf + align), seek_char, len);
120 FOR_EACH_IMPL (impl, 0)
121 printf ("\t%s", impl->name);
124 for (i = 1; i < 8; ++i)
126 do_test (0, 16 << i, 2048, 23);
127 do_test (i, 64, 256, 23);
128 do_test (0, 16 << i, 2048, 0);
129 do_test (i, 64, 256, 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);
138 for (i = 1; i < 8; ++i)
140 do_test (i, i << 5, 192, 23);
141 do_test (i, i << 5, 192, 0);
142 do_test (i, i << 5, 256, 23);
143 do_test (i, i << 5, 256, 0);
144 do_test (i, i << 5, 512, 23);
145 do_test (i, i << 5, 512, 0);
147 for (i = 1; i < 32; ++i)
149 do_test (0, i, i + 1, 23);
150 do_test (0, i, i + 1, 0);
151 do_test (i, i, i + 1, 23);
152 do_test (i, i, i + 1, 0);
153 do_test (0, i, i - 1, 23);
154 do_test (0, i, i - 1, 0);
155 do_test (i, i, i - 1, 23);
156 do_test (i, i, i - 1, 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);
167 #include <support/test-driver.c>