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/* Measure memset functions with large data sizes.
Copyright (C) 2016-2017 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;
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, 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>
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