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/* Measure memcpy 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/>. */
#ifndef MEMCPY_RESULT
# define MEMCPY_RESULT(dst, len) dst
# define START_SIZE (64 * 1024)
# define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024)
# define TEST_MAIN
# define TEST_NAME "memcpy"
# define TIMEOUT (20 * 60)
# include "bench-string.h"
IMPL (memcpy, 1)
#endif
typedef char *(*proto_t) (char *, const char *, size_t);
static void
do_one_test (impl_t *impl, char *dst, const char *src,
size_t len)
{
size_t i, iters = 16;
timing_t start, stop, cur;
/* Must clear the destination buffer updated by the previous run. */
for (i = 0; i < len; i++)
dst[i] = 0;
if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
{
error (0, 0, "Wrong result in function %s %p %p", impl->name,
CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
ret = 1;
return;
}
if (memcmp (dst, src, len) != 0)
{
error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
impl->name, dst, src);
ret = 1;
return;
}
TIMING_NOW (start);
for (i = 0; i < iters; ++i)
{
CALL (impl, dst, src, len);
}
TIMING_NOW (stop);
TIMING_DIFF (cur, start, stop);
TIMING_PRINT_MEAN ((double) cur, (double) iters);
}
static void
do_test (size_t align1, size_t align2, size_t len)
{
size_t i, j;
char *s1, *s2;
align1 &= 63;
if (align1 + len >= page_size)
return;
align2 &= 63;
if (align2 + len >= page_size)
return;
s1 = (char *) (buf1 + align1);
s2 = (char *) (buf2 + align2);
for (i = 0, j = 1; i < len; i++, j += 23)
s1[i] = j;
printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s2, s1, len);
putchar ('\n');
}
int
test_main (void)
{
size_t i;
test_init ();
printf ("%23s", "");
FOR_EACH_IMPL (impl, 0)
printf ("\t%s", impl->name);
putchar ('\n');
for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
{
do_test (0, 0, i + 7);
do_test (0, 3, i + 15);
do_test (3, 0, i + 31);
do_test (3, 5, i + 63);
}
return ret;
}
#include <support/test-driver.c>
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