File: bench-strchr.c

package info (click to toggle)
glibc 2.19-18+deb8u4
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-backports
  • size: 204,416 kB
  • ctags: 144,800
  • sloc: ansic: 970,361; asm: 241,207; sh: 10,069; makefile: 8,475; cpp: 3,595; perl: 2,077; pascal: 1,839; awk: 1,704; yacc: 317; sed: 73
file content (200 lines) | stat: -rw-r--r-- 4,561 bytes parent folder | download | duplicates (10)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
/* Measure STRCHR functions.
   Copyright (C) 2013-2014 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#define TEST_MAIN
#ifndef WIDE
# ifdef USE_FOR_STRCHRNUL
#  define TEST_NAME "strchrnul"
# else
#  define TEST_NAME "strchr"
# endif
#else
# define TEST_NAME "wcschr"
#endif
#include "bench-string.h"

#ifndef WIDE
# ifdef USE_FOR_STRCHRNUL
#  define STRCHR strchrnul
#  define stupid_STRCHR stupid_STRCHRNUL
#  define simple_STRCHR simple_STRCHRNUL
# else
#  define STRCHR strchr
# endif
# define STRLEN strlen
# define CHAR char
# define BIG_CHAR CHAR_MAX
# define MIDDLE_CHAR 127
# define SMALL_CHAR 23
# define UCHAR unsigned char
#else
# include <wchar.h>
# define STRCHR wcschr
# define STRLEN wcslen
# define CHAR wchar_t
# define BIG_CHAR WCHAR_MAX
# define MIDDLE_CHAR 1121
# define SMALL_CHAR 851
# define UCHAR wchar_t
#endif

#ifdef USE_FOR_STRCHRNUL
# define NULLRET(endptr) endptr
#else
# define NULLRET(endptr) NULL
#endif


typedef CHAR *(*proto_t) (const CHAR *, int);

CHAR *
simple_STRCHR (const CHAR *s, int c)
{
  for (; *s != (CHAR) c; ++s)
    if (*s == '\0')
      return NULLRET ((CHAR *) s);
  return (CHAR *) s;
}

CHAR *
stupid_STRCHR (const CHAR *s, int c)
{
  size_t n = STRLEN (s) + 1;

  while (n--)
    if (*s++ == (CHAR) c)
      return (CHAR *) s - 1;
  return NULLRET ((CHAR *) s - 1);
}

IMPL (stupid_STRCHR, 0)
IMPL (simple_STRCHR, 0)
IMPL (STRCHR, 1)

static void
do_one_test (impl_t *impl, const CHAR *s, int c, const CHAR *exp_res)
{
  size_t i, iters = INNER_LOOP_ITERS;
  timing_t start, stop, cur;

  TIMING_NOW (start);
  for (i = 0; i < iters; ++i)
    {
      CALL (impl, s, c);
    }
  TIMING_NOW (stop);

  TIMING_DIFF (cur, start, stop);

  TIMING_PRINT_MEAN ((double) cur, (double) iters);
}

static void
do_test (size_t align, size_t pos, size_t len, int seek_char, int max_char)
/* For wcschr: align here means align not in bytes,
   but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t))
   len for wcschr here isn't in bytes but it's number of wchar_t symbols.  */
{
  size_t i;
  CHAR *result;
  CHAR *buf = (CHAR *) buf1;
  align &= 15;
  if ((align + len) * sizeof (CHAR) >= page_size)
    return;

  for (i = 0; i < len; ++i)
    {
      buf[align + i] = 32 + 23 * i % max_char;
      if (buf[align + i] == seek_char)
	buf[align + i] = seek_char + 1;
      else if (buf[align + i] == 0)
	buf[align + i] = 1;
    }
  buf[align + len] = 0;

  if (pos < len)
    {
      buf[align + pos] = seek_char;
      result = buf + align + pos;
    }
  else if (seek_char == 0)
    result = buf + align + len;
  else
    result = NULLRET (buf + align + len);

  printf ("Length %4zd, alignment in bytes %2zd:",
	  pos, align * sizeof (CHAR));

  FOR_EACH_IMPL (impl, 0)
    do_one_test (impl, buf + align, seek_char, result);

  putchar ('\n');
}

int
test_main (void)
{
  size_t i;

  test_init ();

  printf ("%20s", "");
  FOR_EACH_IMPL (impl, 0)
    printf ("\t%s", impl->name);
  putchar ('\n');

  for (i = 1; i < 8; ++i)
    {
      do_test (0, 16 << i, 2048, SMALL_CHAR, MIDDLE_CHAR);
      do_test (i, 16 << i, 2048, SMALL_CHAR, MIDDLE_CHAR);
    }

  for (i = 1; i < 8; ++i)
    {
      do_test (i, 64, 256, SMALL_CHAR, MIDDLE_CHAR);
      do_test (i, 64, 256, SMALL_CHAR, BIG_CHAR);
    }

  for (i = 0; i < 32; ++i)
    {
      do_test (0, i, i + 1, SMALL_CHAR, MIDDLE_CHAR);
      do_test (0, i, i + 1, SMALL_CHAR, BIG_CHAR);
    }

  for (i = 1; i < 8; ++i)
    {
      do_test (0, 16 << i, 2048, 0, MIDDLE_CHAR);
      do_test (i, 16 << i, 2048, 0, MIDDLE_CHAR);
    }

  for (i = 1; i < 8; ++i)
    {
      do_test (i, 64, 256, 0, MIDDLE_CHAR);
      do_test (i, 64, 256, 0, BIG_CHAR);
    }

  for (i = 0; i < 32; ++i)
    {
      do_test (0, i, i + 1, 0, MIDDLE_CHAR);
      do_test (0, i, i + 1, 0, BIG_CHAR);
    }

  return ret;
}

#include "../test-skeleton.c"