summaryrefslogtreecommitdiff
path: root/benchtests/bench-memset-large.c
blob: ede00812a57242bf07057519732a4a9bd42a480f (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
/* Measure memset functions with large data sizes.
   Copyright (C) 2016 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
# define TEST_NAME "memset"
#else
# define TEST_NAME "wmemset"
#endif /* WIDE */
#define START_SIZE (128 * 1024)
#define MIN_PAGE_SIZE (getpagesize () + 64 * 1024 * 1024)
#define TIMEOUT (20 * 60)
#include "bench-string.h"

#ifndef WIDE
# define MEMSET memset
# define CHAR char
# define SIMPLE_MEMSET simple_memset
# define MEMCMP memcmp
#else
# include <wchar.h>
# define MEMSET wmemset
# define CHAR wchar_t
# define SIMPLE_MEMSET simple_wmemset
# define MEMCMP wmemcmp
#endif /* WIDE */

#include <assert.h>

IMPL (MEMSET, 1)

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

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 = 16;
  timing_t start, stop, cur;
  CHAR *tstbuf = malloc (n * sizeof (*s));
  assert (tstbuf != NULL);

  /* Must clear the destination buffer updated by the previous run.  */
  for (i = 0; i < n; i++)
    s[i] = 0;

  CHAR *res = CALL (impl, s, c, n);
  if (res != s
      || SIMPLE_MEMSET (tstbuf, c, n) != tstbuf
      || MEMCMP (s, tstbuf, n) != 0)
    {
      error (0, 0, "Wrong result in function %s", impl->name);
      ret = 1;
      free (tstbuf);
      return;
    }

  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);

  free (tstbuf);
}

static void
do_test (size_t align, int c, size_t len)
{
  align &= 63;
  if ((align + len) * sizeof (CHAR) > 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;

  test_init ();

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

  c = 65;
  for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
    {
      do_test (0, c, i);
      do_test (3, c, i);
    }

  return ret;
}

#include <support/test-driver.c>