mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-27 03:41:23 +08:00
2623479105
Adjust iteration counts so benchmarks don't run too slowly or quickly. Ensure benchmarks take less than 10 seconds on older, slower cores and more than 0.5 seconds on fast cores. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/* Measure memccpy functions.
|
|
Copyright (C) 2013-2023 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#define TEST_MAIN
|
|
#define TEST_NAME "memccpy"
|
|
#include "bench-string.h"
|
|
|
|
void *
|
|
generic_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;
|
|
}
|
|
|
|
IMPL (memccpy, 1)
|
|
IMPL (generic_memccpy, 0)
|
|
|
|
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_LARGE * 4;
|
|
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>
|