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/* Measure memccpy functions.
Copyright (C) 2013-2019 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
#define TEST_NAME "memccpy"
#include "bench-string.h"
void *simple_memccpy (void *, const void *, int, size_t);
void *stupid_memccpy (void *, const void *, int, size_t);
IMPL (stupid_memccpy, 0)
IMPL (simple_memccpy, 0)
IMPL (memccpy, 1)
void *
simple_memccpy (void *dst, const void *src, int c, size_t n)
{
const char *s = src;
char *d = dst;
while (n-- > 0)
if ((*d++ = *s++) == (char) c)
return d;
return NULL;
}
void *
stupid_memccpy (void *dst, const void *src, int c, size_t n)
{
void *p = memchr (src, c, n);
if (p != NULL)
return mempcpy (dst, src, p - src + 1);
memcpy (dst, src, n);
return NULL;
}
typedef void *(*proto_t) (void *, const void *, int c, size_t);
static void
do_one_test (impl_t *impl, void *dst, const void *src, int c, size_t len,
size_t n)
{
size_t i, iters = INNER_LOOP_ITERS;
timing_t start, stop, cur;
TIMING_NOW (start);
for (i = 0; i < iters; ++i)
{
CALL (impl, dst, src, c, n);
}
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, int c, size_t len, size_t n,
int max_char)
{
size_t i;
char *s1, *s2;
align1 &= 7;
if (align1 + len >= page_size)
return;
align2 &= 7;
if (align2 + len >= page_size)
return;
s1 = (char *) (buf1 + align1);
s2 = (char *) (buf2 + align2);
for (i = 0; i < len - 1; ++i)
{
s1[i] = 32 + 23 * i % (max_char - 32);
if (s1[i] == (char) c)
--s1[i];
}
s1[len - 1] = c;
for (i = len; i + align1 < page_size && i < len + 64; ++i)
s1[i] = 32 + 32 * i % (max_char - 32);
printf ("Length %4zd, n %4zd, char %d, alignment %2zd/%2zd:", len, n, c, align1, align2);
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s2, s1, c, len, n);
putchar ('\n');
}
int
test_main (void)
{
size_t i;
test_init ();
printf ("%28s", "");
FOR_EACH_IMPL (impl, 0)
printf ("\t%s", impl->name);
putchar ('\n');
for (i = 1; i < 8; ++i)
{
do_test (i, i, 12, 16, 16, 127);
do_test (i, i, 23, 16, 16, 255);
do_test (i, 2 * i, 28, 16, 16, 127);
do_test (2 * i, i, 31, 16, 16, 255);
do_test (8 - i, 2 * i, 1, 1 << i, 2 << i, 127);
do_test (2 * i, 8 - i, 17, 2 << i, 1 << i, 127);
do_test (8 - i, 2 * i, 0, 1 << i, 2 << i, 255);
do_test (2 * i, 8 - i, i, 2 << i, 1 << i, 255);
}
for (i = 1; i < 8; ++i)
{
do_test (0, 0, i, 4 << i, 8 << i, 127);
do_test (0, 0, i, 16 << i, 8 << i, 127);
do_test (8 - i, 2 * i, i, 4 << i, 8 << i, 127);
do_test (8 - i, 2 * i, i, 16 << i, 8 << i, 127);
}
return ret;
}
#include <support/test-driver.c>
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