about summary refs log tree commit diff
path: root/benchtests/bench-memchr.c
blob: 0facda2fa006fd7413af3d3cc0b94cd4a6e135b7 (plain) (blame)
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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
/* Measure memchr functions.
   Copyright (C) 2013-2022 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
   <https://www.gnu.org/licenses/>.  */

#ifndef WIDE
# define SMALL_CHAR 127
#else
# 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 SIMPLE_MEMCHR simple_memchr
# else
#  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 */

#include "json-lib.h"

static void
do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s, int c,
	     size_t n)
{
  size_t i, iters = INNER_LOOP_ITERS_LARGE;
  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);

  json_element_double (json_ctx, (double) cur / (double) iters);
}

static void
do_test (json_ctx_t *json_ctx, size_t align, size_t pos, size_t len,
	 int seek_char, int invert_pos)
{
  size_t i;

  align &= getpagesize () - 1;
  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)
    {
      if (invert_pos)
	buf[align + len - pos] = seek_char;
      else
	buf[align + pos] = seek_char;
      buf[align + len] = -seek_char;
    }
  else
    {
      buf[align + len] = seek_char;
    }

  json_element_object_begin (json_ctx);
  json_attr_uint (json_ctx, "align", align);
  json_attr_uint (json_ctx, "pos", pos);
  json_attr_uint (json_ctx, "len", len);
  json_attr_uint (json_ctx, "seek_char", seek_char);
  json_attr_uint (json_ctx, "invert_pos", invert_pos);

  json_array_begin (json_ctx, "timings");

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

  json_array_end (json_ctx);
  json_element_object_end (json_ctx);
}

int
test_main (void)
{
  size_t i;
  int repeats;
  json_ctx_t json_ctx;
  test_init ();

  json_init (&json_ctx, 0, stdout);

  json_document_begin (&json_ctx);
  json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);

  json_attr_object_begin (&json_ctx, "functions");
  json_attr_object_begin (&json_ctx, TEST_NAME);
  json_attr_string (&json_ctx, "bench-variant", "");

  json_array_begin (&json_ctx, "ifuncs");
  FOR_EACH_IMPL (impl, 0)
    json_element_string (&json_ctx, impl->name);
  json_array_end (&json_ctx);

  json_array_begin (&json_ctx, "results");

  for (repeats = 0; repeats < 2; ++repeats)
    {
      for (i = 1; i < 8; ++i)
	{
	  do_test (&json_ctx, 0, 16 << i, 2048, 23, repeats);
	  do_test (&json_ctx, i, 64, 256, 23, repeats);
	  do_test (&json_ctx, 0, 16 << i, 2048, 0, repeats);
	  do_test (&json_ctx, i, 64, 256, 0, repeats);

	  do_test (&json_ctx, getpagesize () - 15, 64, 256, 0, repeats);
#ifdef USE_AS_MEMRCHR
	  /* Also test the position close to the beginning for memrchr.  */
	  do_test (&json_ctx, 0, i, 256, 23, repeats);
	  do_test (&json_ctx, 0, i, 256, 0, repeats);
	  do_test (&json_ctx, i, i, 256, 23, repeats);
	  do_test (&json_ctx, i, i, 256, 0, repeats);
#endif
	}
      for (i = 1; i < 8; ++i)
	{
	  do_test (&json_ctx, i, i << 5, 192, 23, repeats);
	  do_test (&json_ctx, i, i << 5, 192, 0, repeats);
	  do_test (&json_ctx, i, i << 5, 256, 23, repeats);
	  do_test (&json_ctx, i, i << 5, 256, 0, repeats);
	  do_test (&json_ctx, i, i << 5, 512, 23, repeats);
	  do_test (&json_ctx, i, i << 5, 512, 0, repeats);

	  do_test (&json_ctx, getpagesize () - 15, i << 5, 256, 23, repeats);
	}
      for (i = 1; i < 32; ++i)
	{
	  do_test (&json_ctx, 0, i, i + 1, 23, repeats);
	  do_test (&json_ctx, 0, i, i + 1, 0, repeats);
	  do_test (&json_ctx, i, i, i + 1, 23, repeats);
	  do_test (&json_ctx, i, i, i + 1, 0, repeats);
	  do_test (&json_ctx, 0, i, i - 1, 23, repeats);
	  do_test (&json_ctx, 0, i, i - 1, 0, repeats);
	  do_test (&json_ctx, i, i, i - 1, 23, repeats);
	  do_test (&json_ctx, i, i, i - 1, 0, repeats);

	  do_test (&json_ctx, getpagesize () / 2, i, i + 1, 23, repeats);
	  do_test (&json_ctx, getpagesize () / 2, i, i + 1, 0, repeats);
	  do_test (&json_ctx, getpagesize () / 2 + i, i, i + 1, 23, repeats);
	  do_test (&json_ctx, getpagesize () / 2 + i, i, i + 1, 0, repeats);
	  do_test (&json_ctx, getpagesize () / 2, i, i - 1, 23, repeats);
	  do_test (&json_ctx, getpagesize () / 2, i, i - 1, 0, repeats);
	  do_test (&json_ctx, getpagesize () / 2 + i, i, i - 1, 23, repeats);
	  do_test (&json_ctx, getpagesize () / 2 + i, i, i - 1, 0, repeats);

	  do_test (&json_ctx, getpagesize () - 15, i, i - 1, 23, repeats);
	  do_test (&json_ctx, getpagesize () - 15, i, i - 1, 0, repeats);

	  do_test (&json_ctx, getpagesize () - 15, i, i + 1, 23, repeats);
	  do_test (&json_ctx, getpagesize () - 15, i, i + 1, 0, repeats);

#ifdef USE_AS_MEMRCHR
	  do_test (&json_ctx, 0, 1, i + 1, 23, repeats);
	  do_test (&json_ctx, 0, 2, i + 1, 0, repeats);
#endif
	}
#ifndef USE_AS_MEMRCHR
      break;
#endif
    }

  json_array_end (&json_ctx);
  json_attr_object_end (&json_ctx);
  json_attr_object_end (&json_ctx);
  json_document_end (&json_ctx);

  return ret;
}

#include <support/test-driver.c>