Support _Float32 in libm_alias_float.
[glibc.git] / benchtests / bench-strncmp.c
blobdddd009792e5add5595991250afe2cfbe83a905b
1 /* Measure strncmp functions.
2 Copyright (C) 2013-2017 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 <http://www.gnu.org/licenses/>. */
19 #define TEST_MAIN
20 #ifdef WIDE
21 # define TEST_NAME "wcsncmp"
22 #else
23 # define TEST_NAME "strncmp"
24 #endif /* !WIDE */
25 #include "bench-string.h"
27 #ifdef WIDE
28 # include <wchar.h>
30 # define L(str) L##str
31 # define STRNCMP wcsncmp
32 # define SIMPLE_STRNCMP simple_wcsncmp
33 # define STUPID_STRNCMP stupid_wcsncmp
34 # define CHAR wchar_t
35 # define CHARBYTES 4
37 /* Wcsncmp uses signed semantics for comparison, not unsigned.
38 Avoid using substraction since possible overflow. */
39 int
40 simple_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
42 wchar_t c1, c2;
44 while (n--)
46 c1 = *s1++;
47 c2 = *s2++;
48 if (c1 == L ('\0') || c1 != c2)
49 return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0);
51 return 0;
54 int
55 stupid_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
57 wchar_t c1, c2;
58 size_t ns1 = wcsnlen (s1, n) + 1, ns2 = wcsnlen (s2, n) + 1;
60 n = ns1 < n ? ns1 : n;
61 n = ns2 < n ? ns2 : n;
63 while (n--)
65 c1 = *s1++;
66 c2 = *s2++;
67 if (c1 != c2)
68 return c1 > c2 ? 1 : -1;
70 return 0;
73 #else
74 # define L(str) str
75 # define STRNCMP strncmp
76 # define SIMPLE_STRNCMP simple_strncmp
77 # define STUPID_STRNCMP stupid_strncmp
78 # define CHAR char
79 # define CHARBYTES 1
81 /* Strncmp uses unsigned semantics for comparison. */
82 int
83 simple_strncmp (const char *s1, const char *s2, size_t n)
85 int ret = 0;
87 while (n-- && (ret = *(unsigned char *) s1 - * (unsigned char *) s2++) == 0
88 && *s1++);
89 return ret;
92 int
93 stupid_strncmp (const char *s1, const char *s2, size_t n)
95 size_t ns1 = strnlen (s1, n) + 1, ns2 = strnlen (s2, n) + 1;
96 int ret = 0;
98 n = ns1 < n ? ns1 : n;
99 n = ns2 < n ? ns2 : n;
100 while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0);
101 return ret;
104 #endif /* !WIDE */
106 typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
108 IMPL (STUPID_STRNCMP, 0)
109 IMPL (SIMPLE_STRNCMP, 0)
110 IMPL (STRNCMP, 1)
113 static void
114 do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t n,
115 int exp_result)
117 size_t i, iters = INNER_LOOP_ITERS;
118 timing_t start, stop, cur;
120 TIMING_NOW (start);
121 for (i = 0; i < iters; ++i)
123 CALL (impl, s1, s2, n);
125 TIMING_NOW (stop);
127 TIMING_DIFF (cur, start, stop);
129 TIMING_PRINT_MEAN ((double) cur, (double) iters);
132 static void
133 do_test_limit (size_t align1, size_t align2, size_t len, size_t n, int max_char,
134 int exp_result)
136 size_t i, align_n;
137 CHAR *s1, *s2;
139 if (n == 0)
141 s1 = (CHAR *) (buf1 + page_size);
142 s2 = (CHAR *) (buf2 + page_size);
143 printf ("Length %4zd/%4zd:", len, n);
145 FOR_EACH_IMPL (impl, 0)
146 do_one_test (impl, s1, s2, n, 0);
148 putchar ('\n');
150 return;
153 align1 &= 15;
154 align2 &= 15;
155 align_n = (page_size - n * CHARBYTES) & 15;
157 s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);
158 s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);
160 if (align1 < align_n)
161 s1 = (CHAR *) ((char *) s1 - (align_n - align1));
163 if (align2 < align_n)
164 s2 = (CHAR *) ((char *) s2 - (align_n - align2));
166 for (i = 0; i < n; i++)
167 s1[i] = s2[i] = 1 + 23 * i % max_char;
169 if (len < n)
171 s1[len] = 0;
172 s2[len] = 0;
173 if (exp_result < 0)
174 s2[len] = 32;
175 else if (exp_result > 0)
176 s1[len] = 64;
179 printf ("Length %4zd/%4zd, alignment %2zd/%2zd:", len, n, align1, align2);
181 FOR_EACH_IMPL (impl, 0)
182 do_one_test (impl, s1, s2, n, exp_result);
184 putchar ('\n');
187 static void
188 do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char,
189 int exp_result)
191 size_t i;
192 CHAR *s1, *s2;
194 if (n == 0)
195 return;
197 align1 &= 63;
198 if (align1 + (n + 1) * CHARBYTES >= page_size)
199 return;
201 align2 &= 7;
202 if (align2 + (n + 1) * CHARBYTES >= page_size)
203 return;
205 s1 = (CHAR *) (buf1 + align1);
206 s2 = (CHAR *) (buf2 + align2);
208 for (i = 0; i < n; i++)
209 s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
211 s1[n] = 24 + exp_result;
212 s2[n] = 23;
213 s1[len] = 0;
214 s2[len] = 0;
215 if (exp_result < 0)
216 s2[len] = 32;
217 else if (exp_result > 0)
218 s1[len] = 64;
219 if (len >= n)
220 s2[n - 1] -= exp_result;
222 printf ("Length %4zd/%4zd, alignment %2zd/%2zd:", len, n, align1, align2);
224 FOR_EACH_IMPL (impl, 0)
225 do_one_test (impl, s1, s2, n, exp_result);
227 putchar ('\n');
231 test_main (void)
233 size_t i;
235 test_init ();
237 printf ("%23s", "");
238 FOR_EACH_IMPL (impl, 0)
239 printf ("\t%s", impl->name);
240 putchar ('\n');
242 for (i =0; i < 16; ++i)
244 do_test (0, 0, 8, i, 127, 0);
245 do_test (0, 0, 8, i, 127, -1);
246 do_test (0, 0, 8, i, 127, 1);
247 do_test (i, i, 8, i, 127, 0);
248 do_test (i, i, 8, i, 127, 1);
249 do_test (i, i, 8, i, 127, -1);
250 do_test (i, 2 * i, 8, i, 127, 0);
251 do_test (2 * i, i, 8, i, 127, 1);
252 do_test (i, 3 * i, 8, i, 127, -1);
253 do_test (0, 0, 8, i, 255, 0);
254 do_test (0, 0, 8, i, 255, -1);
255 do_test (0, 0, 8, i, 255, 1);
256 do_test (i, i, 8, i, 255, 0);
257 do_test (i, i, 8, i, 255, 1);
258 do_test (i, i, 8, i, 255, -1);
259 do_test (i, 2 * i, 8, i, 255, 0);
260 do_test (2 * i, i, 8, i, 255, 1);
261 do_test (i, 3 * i, 8, i, 255, -1);
264 for (i = 1; i < 8; ++i)
266 do_test (0, 0, 8 << i, 16 << i, 127, 0);
267 do_test (0, 0, 8 << i, 16 << i, 127, 1);
268 do_test (0, 0, 8 << i, 16 << i, 127, -1);
269 do_test (0, 0, 8 << i, 16 << i, 255, 0);
270 do_test (0, 0, 8 << i, 16 << i, 255, 1);
271 do_test (0, 0, 8 << i, 16 << i, 255, -1);
272 do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 0);
273 do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 1);
274 do_test (2 * i, i, 8 << i, 16 << i, 255, 0);
275 do_test (2 * i, i, 8 << i, 16 << i, 255, 1);
278 do_test_limit (0, 0, 0, 0, 127, 0);
279 do_test_limit (4, 0, 21, 20, 127, 0);
280 do_test_limit (0, 4, 21, 20, 127, 0);
281 do_test_limit (8, 0, 25, 24, 127, 0);
282 do_test_limit (0, 8, 25, 24, 127, 0);
284 for (i = 0; i < 8; ++i)
286 do_test_limit (0, 0, 17 - i, 16 - i, 127, 0);
287 do_test_limit (0, 0, 17 - i, 16 - i, 255, 0);
288 do_test_limit (0, 0, 15 - i, 16 - i, 127, 0);
289 do_test_limit (0, 0, 15 - i, 16 - i, 127, 1);
290 do_test_limit (0, 0, 15 - i, 16 - i, 127, -1);
291 do_test_limit (0, 0, 15 - i, 16 - i, 255, 0);
292 do_test_limit (0, 0, 15 - i, 16 - i, 255, 1);
293 do_test_limit (0, 0, 15 - i, 16 - i, 255, -1);
296 return ret;
299 #include <support/test-driver.c>