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97020474 | 1 | /* Measure memcmp functions. |
d4697bc9 | 2 | Copyright (C) 2013-2014 Free Software Foundation, Inc. |
97020474 SP |
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 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #define TEST_MAIN | |
20 | #ifdef WIDE | |
21 | # define TEST_NAME "wmemcmp" | |
22 | #else | |
23 | # define TEST_NAME "memcmp" | |
24 | #endif | |
25 | #include "bench-string.h" | |
26 | #ifdef WIDE | |
27 | # include <inttypes.h> | |
28 | # include <wchar.h> | |
29 | ||
30 | # define MEMCMP wmemcmp | |
31 | # define MEMCPY wmemcpy | |
32 | # define SIMPLE_MEMCMP simple_wmemcmp | |
33 | # define CHAR wchar_t | |
34 | # define UCHAR wchar_t | |
35 | # define CHARBYTES 4 | |
36 | # define CHAR__MIN WCHAR_MIN | |
37 | # define CHAR__MAX WCHAR_MAX | |
38 | int | |
39 | simple_wmemcmp (const wchar_t *s1, const wchar_t *s2, size_t n) | |
40 | { | |
41 | int ret = 0; | |
42 | /* Warning! | |
43 | wmemcmp has to use SIGNED comparison for elements. | |
44 | memcmp has to use UNSIGNED comparison for elemnts. | |
45 | */ | |
46 | while (n-- && (ret = *s1 < *s2 ? -1 : *s1 == *s2 ? 0 : 1) == 0) {s1++; s2++;} | |
47 | return ret; | |
48 | } | |
49 | #else | |
50 | # include <limits.h> | |
51 | ||
52 | # define MEMCMP memcmp | |
53 | # define MEMCPY memcpy | |
54 | # define SIMPLE_MEMCMP simple_memcmp | |
55 | # define CHAR char | |
56 | # define MAX_CHAR 255 | |
57 | # define UCHAR unsigned char | |
58 | # define CHARBYTES 1 | |
59 | # define CHAR__MIN CHAR_MIN | |
60 | # define CHAR__MAX CHAR_MAX | |
61 | ||
62 | int | |
63 | simple_memcmp (const char *s1, const char *s2, size_t n) | |
64 | { | |
65 | int ret = 0; | |
66 | ||
67 | while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0); | |
68 | return ret; | |
69 | } | |
70 | #endif | |
71 | ||
72 | typedef int (*proto_t) (const CHAR *, const CHAR *, size_t); | |
73 | ||
74 | IMPL (SIMPLE_MEMCMP, 0) | |
75 | IMPL (MEMCMP, 1) | |
76 | ||
77 | static void | |
78 | do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t len, | |
79 | int exp_result) | |
80 | { | |
44558701 WN |
81 | size_t i, iters = INNER_LOOP_ITERS; |
82 | timing_t start, stop, cur; | |
83 | ||
84 | TIMING_NOW (start); | |
85 | for (i = 0; i < iters; ++i) | |
97020474 | 86 | { |
44558701 | 87 | CALL (impl, s1, s2, len); |
97020474 | 88 | } |
44558701 WN |
89 | TIMING_NOW (stop); |
90 | ||
91 | TIMING_DIFF (cur, start, stop); | |
92 | ||
93 | TIMING_PRINT_MEAN ((double) cur, (double) iters); | |
97020474 SP |
94 | } |
95 | ||
96 | static void | |
97 | do_test (size_t align1, size_t align2, size_t len, int exp_result) | |
98 | { | |
99 | size_t i; | |
100 | CHAR *s1, *s2; | |
101 | ||
102 | if (len == 0) | |
103 | return; | |
104 | ||
105 | align1 &= 63; | |
106 | if (align1 + (len + 1) * CHARBYTES >= page_size) | |
107 | return; | |
108 | ||
109 | align2 &= 63; | |
110 | if (align2 + (len + 1) * CHARBYTES >= page_size) | |
111 | return; | |
112 | ||
113 | s1 = (CHAR *) (buf1 + align1); | |
114 | s2 = (CHAR *) (buf2 + align2); | |
115 | ||
116 | for (i = 0; i < len; i++) | |
117 | s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % CHAR__MAX; | |
118 | ||
119 | s1[len] = align1; | |
120 | s2[len] = align2; | |
121 | s2[len - 1] -= exp_result; | |
122 | ||
44558701 | 123 | printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2); |
97020474 SP |
124 | |
125 | FOR_EACH_IMPL (impl, 0) | |
126 | do_one_test (impl, s1, s2, len, exp_result); | |
127 | ||
44558701 | 128 | putchar ('\n'); |
97020474 SP |
129 | } |
130 | ||
131 | int | |
132 | test_main (void) | |
133 | { | |
134 | size_t i; | |
135 | ||
136 | test_init (); | |
137 | ||
138 | printf ("%23s", ""); | |
139 | FOR_EACH_IMPL (impl, 0) | |
140 | printf ("\t%s", impl->name); | |
141 | putchar ('\n'); | |
142 | ||
143 | for (i = 1; i < 16; ++i) | |
144 | { | |
145 | do_test (i * CHARBYTES, i * CHARBYTES, i, 0); | |
146 | do_test (i * CHARBYTES, i * CHARBYTES, i, 1); | |
147 | do_test (i * CHARBYTES, i * CHARBYTES, i, -1); | |
148 | } | |
149 | ||
150 | for (i = 0; i < 16; ++i) | |
151 | { | |
152 | do_test (0, 0, i, 0); | |
153 | do_test (0, 0, i, 1); | |
154 | do_test (0, 0, i, -1); | |
155 | } | |
156 | ||
157 | for (i = 1; i < 10; ++i) | |
158 | { | |
159 | do_test (0, 0, 2 << i, 0); | |
160 | do_test (0, 0, 2 << i, 1); | |
161 | do_test (0, 0, 2 << i, -1); | |
162 | do_test (0, 0, 16 << i, 0); | |
163 | do_test ((8 - i) * CHARBYTES, (2 * i) * CHARBYTES, 16 << i, 0); | |
164 | do_test (0, 0, 16 << i, 1); | |
165 | do_test (0, 0, 16 << i, -1); | |
166 | } | |
167 | ||
168 | for (i = 1; i < 8; ++i) | |
169 | { | |
170 | do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 0); | |
171 | do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 1); | |
172 | do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, -1); | |
173 | } | |
174 | ||
175 | return ret; | |
176 | } | |
177 | #include "../test-skeleton.c" |