glibc/benchtests/bench-memcmp.c
Paul Eggert 581c785bf3 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 7061 files FOO.

I then removed trailing white space from math/tgmath.h,
support/tst-support-open-dev-null-range.c, and
sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following
obscure pre-commit check failure diagnostics from Savannah.  I don't
know why I run into these diagnostics whereas others evidently do not.

remote: *** 912-#endif
remote: *** 913:
remote: *** 914-
remote: *** error: lines with trailing whitespace found
...
remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
2022-01-01 11:40:24 -08:00

210 lines
5.6 KiB
C

/* Measure memcmp functions.
Copyright (C) 2013-2022 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
#ifdef TEST_MEMCMPEQ
# define TEST_NAME "__memcmpeq"
# define SIMPLE_MEMCMP simple_memcmpeq
#elif defined WIDE
# define TEST_NAME "wmemcmp"
# define SIMPLE_MEMCMP simple_wmemcmp
#else
# define TEST_NAME "memcmp"
# define SIMPLE_MEMCMP simple_memcmp
#endif
#include "bench-string.h"
#ifdef WIDE
int
SIMPLE_MEMCMP (const wchar_t *s1, const wchar_t *s2, size_t n)
{
int ret = 0;
/* Warning!
wmemcmp has to use SIGNED comparison for elements.
memcmp has to use UNSIGNED comparison for elemnts.
*/
while (n-- && (ret = *s1 < *s2 ? -1 : *s1 == *s2 ? 0 : 1) == 0) {s1++; s2++;}
return ret;
}
#else
# include <limits.h>
int
SIMPLE_MEMCMP (const char *s1, const char *s2, size_t n)
{
int ret = 0;
while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0);
return ret;
}
#endif
# include "json-lib.h"
typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
IMPL (SIMPLE_MEMCMP, 0)
IMPL (MEMCMP, 1)
static void
do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s1,
const CHAR *s2, size_t len, int exp_result)
{
size_t i, iters = INNER_LOOP_ITERS_LARGE;
timing_t start, stop, cur;
TIMING_NOW (start);
for (i = 0; i < iters; ++i)
{
CALL (impl, s1, s2, len);
}
TIMING_NOW (stop);
TIMING_DIFF (cur, start, stop);
json_element_double (json_ctx, (double) cur / (double) iters);
}
static void
do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
int exp_result)
{
size_t i;
CHAR *s1, *s2;
if (len == 0)
return;
align1 &= (4096 - CHARBYTES);
if (align1 + (len + 1) * CHARBYTES >= page_size)
return;
align2 &= (4096 - CHARBYTES);
if (align2 + (len + 1) * CHARBYTES >= page_size)
return;
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "length", (double) len);
json_attr_uint (json_ctx, "align1", (double) align1);
json_attr_uint (json_ctx, "align2", (double) align2);
json_attr_uint (json_ctx, "result", (double) exp_result);
json_array_begin (json_ctx, "timings");
s1 = (CHAR *)(buf1 + align1);
s2 = (CHAR *)(buf2 + align2);
for (i = 0; i < len; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % MAX_CHAR;
s1[len] = align1;
s2[len] = align2;
s2[len - 1] -= exp_result;
FOR_EACH_IMPL (impl, 0)
{
do_one_test (json_ctx, impl, s1, s2, len, exp_result);
}
json_array_end (json_ctx);
json_element_object_end (json_ctx);
}
int
test_main (void)
{
json_ctx_t json_ctx;
size_t i;
test_init ();
json_init (&json_ctx, 0, stdout);
json_document_begin (&json_ctx);
json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
json_attr_object_begin (&json_ctx, "functions");
json_attr_object_begin (&json_ctx, TEST_NAME);
json_attr_string (&json_ctx, "bench-variant", "default");
json_array_begin (&json_ctx, "ifuncs");
FOR_EACH_IMPL (impl, 0)
json_element_string (&json_ctx, impl->name);
json_array_end (&json_ctx);
json_array_begin (&json_ctx, "results");
for (i = 1; i < 32; ++i)
{
do_test (&json_ctx, i * CHARBYTES, i * CHARBYTES, i, 0);
do_test (&json_ctx, i * CHARBYTES, i * CHARBYTES, i, 1);
do_test (&json_ctx, i * CHARBYTES, i * CHARBYTES, i, -1);
}
for (i = 0; i < 32; ++i)
{
do_test (&json_ctx, 0, 0, i, 0);
do_test (&json_ctx, 0, 0, i, 1);
do_test (&json_ctx, 0, 0, i, -1);
do_test (&json_ctx, 4096 - i, 0, i, 0);
do_test (&json_ctx, 4096 - i, 0, i, 1);
do_test (&json_ctx, 4096 - i, 0, i, -1);
}
for (i = 33; i < 385; i += 32)
{
do_test (&json_ctx, 0, 0, i, 0);
do_test (&json_ctx, 0, 0, i, 1);
do_test (&json_ctx, 0, 0, i, -1);
do_test (&json_ctx, i, 0, i, 0);
do_test (&json_ctx, 0, i, i, 1);
do_test (&json_ctx, i, i, i, -1);
}
for (i = 1; i < 10; ++i)
{
do_test (&json_ctx, 0, 0, 2 << i, 0);
do_test (&json_ctx, 0, 0, 2 << i, 1);
do_test (&json_ctx, 0, 0, 2 << i, -1);
do_test (&json_ctx, (8 - i) * CHARBYTES, (2 * i) * CHARBYTES, 16 << i, 0);
do_test (&json_ctx, 0, 0, 16 << i, 0);
do_test (&json_ctx, 0, 0, 16 << i, 1);
do_test (&json_ctx, 0, 0, 16 << i, -1);
do_test (&json_ctx, i, 0, 2 << i, 0);
do_test (&json_ctx, 0, i, 2 << i, 1);
do_test (&json_ctx, i, i, 2 << i, -1);
do_test (&json_ctx, i, 0, 16 << i, 0);
do_test (&json_ctx, 0, i, 16 << i, 1);
do_test (&json_ctx, i, i, 16 << i, -1);
}
for (i = 1; i < 10; ++i)
{
do_test (&json_ctx, i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 0);
do_test (&json_ctx, i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 1);
do_test (&json_ctx, i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, -1);
}
json_array_end (&json_ctx);
json_attr_object_end (&json_ctx);
json_attr_object_end (&json_ctx);
json_document_end (&json_ctx);
return ret;
}
#include <support/test-driver.c>