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97020474 | 1 | /* Measure strcmp and wcscmp 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 "wcscmp" | |
22 | #else | |
23 | # define TEST_NAME "strcmp" | |
24 | #endif | |
25 | #include "bench-string.h" | |
26 | ||
27 | #ifdef WIDE | |
28 | # include <wchar.h> | |
29 | ||
30 | # define L(str) L##str | |
31 | # define STRCMP wcscmp | |
32 | # define STRCPY wcscpy | |
33 | # define STRLEN wcslen | |
34 | # define MEMCPY wmemcpy | |
35 | # define SIMPLE_STRCMP simple_wcscmp | |
36 | # define STUPID_STRCMP stupid_wcscmp | |
37 | # define CHAR wchar_t | |
38 | # define UCHAR wchar_t | |
39 | # define CHARBYTES 4 | |
40 | # define CHARBYTESLOG 2 | |
41 | # define CHARALIGN __alignof__ (CHAR) | |
42 | # define MIDCHAR 0x7fffffff | |
43 | # define LARGECHAR 0xfffffffe | |
44 | # define CHAR__MAX WCHAR_MAX | |
45 | # define CHAR__MIN WCHAR_MIN | |
46 | ||
47 | /* Wcscmp uses signed semantics for comparison, not unsigned */ | |
48 | /* Avoid using substraction since possible overflow */ | |
49 | ||
50 | int | |
51 | simple_wcscmp (const wchar_t *s1, const wchar_t *s2) | |
52 | { | |
53 | wchar_t c1, c2; | |
54 | do | |
55 | { | |
56 | c1 = *s1++; | |
57 | c2 = *s2++; | |
58 | if (c2 == L'\0') | |
59 | return c1 - c2; | |
60 | } | |
61 | while (c1 == c2); | |
62 | ||
63 | return c1 < c2 ? -1 : 1; | |
64 | } | |
65 | ||
66 | int | |
67 | stupid_wcscmp (const wchar_t *s1, const wchar_t *s2) | |
68 | { | |
69 | size_t ns1 = wcslen (s1) + 1; | |
70 | size_t ns2 = wcslen (s2) + 1; | |
71 | size_t n = ns1 < ns2 ? ns1 : ns2; | |
72 | int ret = 0; | |
73 | ||
74 | wchar_t c1, c2; | |
75 | ||
76 | while (n--) { | |
77 | c1 = *s1++; | |
78 | c2 = *s2++; | |
79 | if ((ret = c1 < c2 ? -1 : c1 == c2 ? 0 : 1) != 0) | |
80 | break; | |
81 | } | |
82 | return ret; | |
83 | } | |
84 | ||
85 | #else | |
86 | # include <limits.h> | |
87 | ||
88 | # define L(str) str | |
89 | # define STRCMP strcmp | |
90 | # define STRCPY strcpy | |
91 | # define STRLEN strlen | |
92 | # define MEMCPY memcpy | |
93 | # define SIMPLE_STRCMP simple_strcmp | |
94 | # define STUPID_STRCMP stupid_strcmp | |
95 | # define CHAR char | |
96 | # define UCHAR unsigned char | |
97 | # define CHARBYTES 1 | |
98 | # define CHARBYTESLOG 0 | |
99 | # define CHARALIGN 1 | |
100 | # define MIDCHAR 0x7f | |
101 | # define LARGECHAR 0xfe | |
102 | # define CHAR__MAX CHAR_MAX | |
103 | # define CHAR__MIN CHAR_MIN | |
104 | ||
105 | /* Strcmp uses unsigned semantics for comparison. */ | |
106 | int | |
107 | simple_strcmp (const char *s1, const char *s2) | |
108 | { | |
109 | int ret; | |
110 | ||
111 | while ((ret = *(unsigned char *) s1 - *(unsigned char*) s2++) == 0 && *s1++); | |
112 | return ret; | |
113 | } | |
114 | ||
115 | int | |
116 | stupid_strcmp (const char *s1, const char *s2) | |
117 | { | |
118 | size_t ns1 = strlen (s1) + 1; | |
119 | size_t ns2 = strlen (s2) + 1; | |
120 | size_t n = ns1 < ns2 ? ns1 : ns2; | |
121 | int ret = 0; | |
122 | ||
123 | while (n--) | |
124 | if ((ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) != 0) | |
125 | break; | |
126 | return ret; | |
127 | } | |
128 | #endif | |
129 | ||
130 | typedef int (*proto_t) (const CHAR *, const CHAR *); | |
131 | ||
132 | IMPL (STUPID_STRCMP, 1) | |
133 | IMPL (SIMPLE_STRCMP, 1) | |
134 | IMPL (STRCMP, 1) | |
135 | ||
136 | static void | |
137 | do_one_test (impl_t *impl, | |
138 | const CHAR *s1, const CHAR *s2, | |
139 | int exp_result) | |
140 | { | |
44558701 WN |
141 | size_t i, iters = INNER_LOOP_ITERS; |
142 | timing_t start, stop, cur; | |
143 | ||
144 | TIMING_NOW (start); | |
145 | for (i = 0; i < iters; ++i) | |
97020474 | 146 | { |
44558701 | 147 | CALL (impl, s1, s2); |
97020474 | 148 | } |
44558701 WN |
149 | TIMING_NOW (stop); |
150 | ||
151 | TIMING_DIFF (cur, start, stop); | |
152 | ||
153 | TIMING_PRINT_MEAN ((double) cur, (double) iters); | |
97020474 SP |
154 | } |
155 | ||
156 | static void | |
157 | do_test (size_t align1, size_t align2, size_t len, int max_char, | |
158 | int exp_result) | |
159 | { | |
160 | size_t i; | |
161 | ||
162 | CHAR *s1, *s2; | |
163 | ||
164 | if (len == 0) | |
165 | return; | |
166 | ||
167 | align1 &= 63; | |
168 | if (align1 + (len + 1) * CHARBYTES >= page_size) | |
169 | return; | |
170 | ||
171 | align2 &= 63; | |
172 | if (align2 + (len + 1) * CHARBYTES >= page_size) | |
173 | return; | |
174 | ||
175 | /* Put them close to the end of page. */ | |
176 | i = align1 + CHARBYTES * (len + 2); | |
177 | s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1); | |
178 | i = align2 + CHARBYTES * (len + 2); | |
179 | s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16) + align2); | |
180 | ||
181 | for (i = 0; i < len; i++) | |
182 | s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; | |
183 | ||
184 | s1[len] = s2[len] = 0; | |
185 | s1[len + 1] = 23; | |
186 | s2[len + 1] = 24 + exp_result; | |
187 | s2[len - 1] -= exp_result; | |
188 | ||
44558701 | 189 | printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2); |
97020474 SP |
190 | |
191 | FOR_EACH_IMPL (impl, 0) | |
192 | do_one_test (impl, s1, s2, exp_result); | |
193 | ||
44558701 | 194 | putchar ('\n'); |
97020474 SP |
195 | } |
196 | ||
197 | int | |
198 | test_main (void) | |
199 | { | |
200 | size_t i; | |
201 | ||
202 | test_init (); | |
203 | ||
204 | printf ("%23s", ""); | |
205 | FOR_EACH_IMPL (impl, 0) | |
206 | printf ("\t%s", impl->name); | |
207 | putchar ('\n'); | |
208 | ||
209 | for (i = 1; i < 32; ++i) | |
210 | { | |
211 | do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0); | |
212 | do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1); | |
213 | do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1); | |
214 | } | |
215 | ||
216 | for (i = 1; i < 10 + CHARBYTESLOG; ++i) | |
217 | { | |
218 | do_test (0, 0, 2 << i, MIDCHAR, 0); | |
219 | do_test (0, 0, 2 << i, LARGECHAR, 0); | |
220 | do_test (0, 0, 2 << i, MIDCHAR, 1); | |
221 | do_test (0, 0, 2 << i, LARGECHAR, 1); | |
222 | do_test (0, 0, 2 << i, MIDCHAR, -1); | |
223 | do_test (0, 0, 2 << i, LARGECHAR, -1); | |
224 | do_test (0, CHARBYTES * i, 2 << i, MIDCHAR, 1); | |
225 | do_test (CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, LARGECHAR, 1); | |
226 | } | |
227 | ||
228 | for (i = 1; i < 8; ++i) | |
229 | { | |
230 | do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 0); | |
231 | do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 0); | |
232 | do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 1); | |
233 | do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 1); | |
234 | do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, -1); | |
235 | do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1); | |
236 | } | |
237 | ||
238 | return ret; | |
239 | } | |
240 | ||
241 | #include "../test-skeleton.c" |