aboutsummaryrefslogtreecommitdiff
path: root/benchtests/bench-memchr.c
blob: 2603cdca99b9f81bc46c5367408edd340bc3cf6b (plain)
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
/* Measure memchr functions.
   Copyright (C) 2013-2018 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/>.  */

#ifndef WIDE
# define CHAR char
# define SMALL_CHAR 127
#else
# include <wchar.h>
# define CHAR wchar_t
# define SMALL_CHAR 1273
#endif /* WIDE */

#ifndef USE_AS_MEMRCHR
# define TEST_MAIN
# ifndef WIDE
#  define TEST_NAME "memchr"
# else
#  define TEST_NAME "wmemchr"
# endif /* WIDE */
# include "bench-string.h"

# ifndef WIDE
#  define MEMCHR memchr
#  define SIMPLE_MEMCHR simple_memchr
# else
#  define MEMCHR wmemchr
#  define SIMPLE_MEMCHR simple_wmemchr
# endif /* WIDE */

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

IMPL (SIMPLE_MEMCHR, 0)
IMPL (MEMCHR, 1)

CHAR *
SIMPLE_MEMCHR (const CHAR *s, int c, size_t n)
{
  while (n--)
    if (*s++ == (CHAR) c)
      return (CHAR *) s - 1;
  return NULL;
}
#endif /* !USE_AS_MEMRCHR */

static void
do_one_test (impl_t *impl, const CHAR *s, int c, size_t n)
{
  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, n);
    }
  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)
{
  size_t i;

  align &= 7;
  if ((align + len) * sizeof (CHAR) >= page_size)
    return;

  CHAR *buf = (CHAR *) (buf1);

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

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

  printf ("Length %4zd, position %4zd, alignment %2zd:",
	  len, pos, align);

  FOR_EACH_IMPL (impl, 0)
    do_one_test (impl, (CHAR *) (buf + align), seek_char, len);

  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, 23);
      do_test (i, 64, 256, 23);
      do_test (0, 16 << i, 2048, 0);
      do_test (i, 64, 256, 0);
#ifdef USE_AS_MEMRCHR
      /* Also test the position close to the beginning for memrchr.  */
      do_test (0, i, 256, 23);
      do_test (0, i, 256, 0);
      do_test (i, i, 256, 23);
      do_test (i, i, 256, 0);
#endif
    }
  for (i = 1; i < 32; ++i)
    {
      do_test (0, i, i + 1, 23);
      do_test (0, i, i + 1, 0);
      do_test (i, i, i + 1, 23);
      do_test (i, i, i + 1, 0);
#ifdef USE_AS_MEMRCHR
      /* Also test the position close to the beginning for memrchr.  */
      do_test (0, 1, i + 1, 23);
      do_test (0, 2, i + 1, 0);
#endif
    }

  return ret;
}

#include <support/test-driver.c>