File: bench-memset.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 (162 lines) | stat: -rw-r--r-- 3,399 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
/* Measure memset 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
#ifdef TEST_BZERO
# define TEST_NAME "bzero"
#else
# define TEST_NAME "memset"
#endif
#define MIN_PAGE_SIZE 131072
#include "bench-string.h"

char *simple_memset (char *, int, size_t);

#ifdef TEST_BZERO
typedef void (*proto_t) (char *, size_t);
void simple_bzero (char *, size_t);
void builtin_bzero (char *, size_t);

IMPL (simple_bzero, 0)
IMPL (builtin_bzero, 0)
IMPL (bzero, 1)

void
simple_bzero (char *s, size_t n)
{
  simple_memset (s, 0, n);
}

void
builtin_bzero (char *s, size_t n)
{
  __builtin_bzero (s, n);
}
#else
typedef char *(*proto_t) (char *, int, size_t);
char *builtin_memset (char *, int, size_t);

IMPL (simple_memset, 0)
IMPL (builtin_memset, 0)
IMPL (memset, 1)

char *
builtin_memset (char *s, int c, size_t n)
{
  return __builtin_memset (s, c, n);
}
#endif

char *
inhibit_loop_to_libcall
simple_memset (char *s, int c, size_t n)
{
  char *r = s, *end = s + n;
  while (r < end)
    *r++ = c;
  return s;
}

static void
do_one_test (impl_t *impl, char *s, int c __attribute ((unused)), size_t n)
{
  size_t i, iters = INNER_LOOP_ITERS;
  timing_t start, stop, cur;
  char tstbuf[n];
#ifdef TEST_BZERO
  simple_bzero (tstbuf, n);
  CALL (impl, s, n);
  if (memcmp (s, tstbuf, n) != 0)
#else
  char *res = CALL (impl, s, c, n);
  if (res != s
      || simple_memset (tstbuf, c, n) != tstbuf
      || memcmp (s, tstbuf, n) != 0)
#endif
    {
      error (0, 0, "Wrong result in function %s", impl->name);
      ret = 1;
      return;
    }

  TIMING_NOW (start);
  for (i = 0; i < iters; ++i)
    {
#ifdef TEST_BZERO
      CALL (impl, s, n);
#else
      CALL (impl, s, c, n);
#endif
    }
  TIMING_NOW (stop);

  TIMING_DIFF (cur, start, stop);

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

static void
do_test (size_t align, int c, size_t len)
{
  align &= 7;
  if (align + len > page_size)
    return;

  printf ("Length %4zd, alignment %2zd, c %2d:", len, align, c);

  FOR_EACH_IMPL (impl, 0)
    do_one_test (impl, (char *) buf1 + align, c, len);

  putchar ('\n');
}

int
test_main (void)
{
  size_t i;
  int c = 0;

  test_init ();

  printf ("%24s", "");
  FOR_EACH_IMPL (impl, 0)
    printf ("\t%s", impl->name);
  putchar ('\n');

#ifndef TEST_BZERO
  for (c = -65; c <= 130; c += 65)
#endif
    {
      for (i = 0; i < 18; ++i)
	do_test (0, c, 1 << i);
      for (i = 1; i < 32; ++i)
	{
	  do_test (i, c, i);
	  if (i & (i - 1))
	    do_test (0, c, i);
	}
      do_test (1, c, 14);
      do_test (3, c, 1024);
      do_test (4, c, 64);
      do_test (2, c, 25);
    }

  return ret;
}

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