mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
300 lines
7.0 KiB
C
300 lines
7.0 KiB
C
/* Measure strncmp functions.
|
|
Copyright (C) 2013-2017 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
|
|
#ifdef WIDE
|
|
# define TEST_NAME "wcsncmp"
|
|
#else
|
|
# define TEST_NAME "strncmp"
|
|
#endif /* !WIDE */
|
|
#include "bench-string.h"
|
|
|
|
#ifdef WIDE
|
|
# include <wchar.h>
|
|
|
|
# define L(str) L##str
|
|
# define STRNCMP wcsncmp
|
|
# define SIMPLE_STRNCMP simple_wcsncmp
|
|
# define STUPID_STRNCMP stupid_wcsncmp
|
|
# define CHAR wchar_t
|
|
# define CHARBYTES 4
|
|
|
|
/* Wcsncmp uses signed semantics for comparison, not unsigned.
|
|
Avoid using substraction since possible overflow. */
|
|
int
|
|
simple_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
|
|
{
|
|
wchar_t c1, c2;
|
|
|
|
while (n--)
|
|
{
|
|
c1 = *s1++;
|
|
c2 = *s2++;
|
|
if (c1 == L ('\0') || c1 != c2)
|
|
return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
stupid_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
|
|
{
|
|
wchar_t c1, c2;
|
|
size_t ns1 = wcsnlen (s1, n) + 1, ns2 = wcsnlen (s2, n) + 1;
|
|
|
|
n = ns1 < n ? ns1 : n;
|
|
n = ns2 < n ? ns2 : n;
|
|
|
|
while (n--)
|
|
{
|
|
c1 = *s1++;
|
|
c2 = *s2++;
|
|
if (c1 != c2)
|
|
return c1 > c2 ? 1 : -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
# define L(str) str
|
|
# define STRNCMP strncmp
|
|
# define SIMPLE_STRNCMP simple_strncmp
|
|
# define STUPID_STRNCMP stupid_strncmp
|
|
# define CHAR char
|
|
# define CHARBYTES 1
|
|
|
|
/* Strncmp uses unsigned semantics for comparison. */
|
|
int
|
|
simple_strncmp (const char *s1, const char *s2, size_t n)
|
|
{
|
|
int ret = 0;
|
|
|
|
while (n-- && (ret = *(unsigned char *) s1 - * (unsigned char *) s2++) == 0
|
|
&& *s1++);
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
stupid_strncmp (const char *s1, const char *s2, size_t n)
|
|
{
|
|
size_t ns1 = strnlen (s1, n) + 1, ns2 = strnlen (s2, n) + 1;
|
|
int ret = 0;
|
|
|
|
n = ns1 < n ? ns1 : n;
|
|
n = ns2 < n ? ns2 : n;
|
|
while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0);
|
|
return ret;
|
|
}
|
|
|
|
#endif /* !WIDE */
|
|
|
|
typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
|
|
|
|
IMPL (STUPID_STRNCMP, 0)
|
|
IMPL (SIMPLE_STRNCMP, 0)
|
|
IMPL (STRNCMP, 1)
|
|
|
|
|
|
static void
|
|
do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t n,
|
|
int exp_result)
|
|
{
|
|
size_t i, iters = INNER_LOOP_ITERS;
|
|
timing_t start, stop, cur;
|
|
|
|
TIMING_NOW (start);
|
|
for (i = 0; i < iters; ++i)
|
|
{
|
|
CALL (impl, s1, s2, n);
|
|
}
|
|
TIMING_NOW (stop);
|
|
|
|
TIMING_DIFF (cur, start, stop);
|
|
|
|
TIMING_PRINT_MEAN ((double) cur, (double) iters);
|
|
}
|
|
|
|
static void
|
|
do_test_limit (size_t align1, size_t align2, size_t len, size_t n, int max_char,
|
|
int exp_result)
|
|
{
|
|
size_t i, align_n;
|
|
CHAR *s1, *s2;
|
|
|
|
if (n == 0)
|
|
{
|
|
s1 = (CHAR *) (buf1 + page_size);
|
|
s2 = (CHAR *) (buf2 + page_size);
|
|
printf ("Length %4zd/%4zd:", len, n);
|
|
|
|
FOR_EACH_IMPL (impl, 0)
|
|
do_one_test (impl, s1, s2, n, 0);
|
|
|
|
putchar ('\n');
|
|
|
|
return;
|
|
}
|
|
|
|
align1 &= 15;
|
|
align2 &= 15;
|
|
align_n = (page_size - n * CHARBYTES) & 15;
|
|
|
|
s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);
|
|
s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);
|
|
|
|
if (align1 < align_n)
|
|
s1 = (CHAR *) ((char *) s1 - (align_n - align1));
|
|
|
|
if (align2 < align_n)
|
|
s2 = (CHAR *) ((char *) s2 - (align_n - align2));
|
|
|
|
for (i = 0; i < n; i++)
|
|
s1[i] = s2[i] = 1 + 23 * i % max_char;
|
|
|
|
if (len < n)
|
|
{
|
|
s1[len] = 0;
|
|
s2[len] = 0;
|
|
if (exp_result < 0)
|
|
s2[len] = 32;
|
|
else if (exp_result > 0)
|
|
s1[len] = 64;
|
|
}
|
|
|
|
printf ("Length %4zd/%4zd, alignment %2zd/%2zd:", len, n, align1, align2);
|
|
|
|
FOR_EACH_IMPL (impl, 0)
|
|
do_one_test (impl, s1, s2, n, exp_result);
|
|
|
|
putchar ('\n');
|
|
}
|
|
|
|
static void
|
|
do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char,
|
|
int exp_result)
|
|
{
|
|
size_t i;
|
|
CHAR *s1, *s2;
|
|
|
|
if (n == 0)
|
|
return;
|
|
|
|
align1 &= 63;
|
|
if (align1 + (n + 1) * CHARBYTES >= page_size)
|
|
return;
|
|
|
|
align2 &= 7;
|
|
if (align2 + (n + 1) * CHARBYTES >= page_size)
|
|
return;
|
|
|
|
s1 = (CHAR *) (buf1 + align1);
|
|
s2 = (CHAR *) (buf2 + align2);
|
|
|
|
for (i = 0; i < n; i++)
|
|
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
|
|
|
|
s1[n] = 24 + exp_result;
|
|
s2[n] = 23;
|
|
s1[len] = 0;
|
|
s2[len] = 0;
|
|
if (exp_result < 0)
|
|
s2[len] = 32;
|
|
else if (exp_result > 0)
|
|
s1[len] = 64;
|
|
if (len >= n)
|
|
s2[n - 1] -= exp_result;
|
|
|
|
printf ("Length %4zd/%4zd, alignment %2zd/%2zd:", len, n, align1, align2);
|
|
|
|
FOR_EACH_IMPL (impl, 0)
|
|
do_one_test (impl, s1, s2, n, exp_result);
|
|
|
|
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 =0; i < 16; ++i)
|
|
{
|
|
do_test (0, 0, 8, i, 127, 0);
|
|
do_test (0, 0, 8, i, 127, -1);
|
|
do_test (0, 0, 8, i, 127, 1);
|
|
do_test (i, i, 8, i, 127, 0);
|
|
do_test (i, i, 8, i, 127, 1);
|
|
do_test (i, i, 8, i, 127, -1);
|
|
do_test (i, 2 * i, 8, i, 127, 0);
|
|
do_test (2 * i, i, 8, i, 127, 1);
|
|
do_test (i, 3 * i, 8, i, 127, -1);
|
|
do_test (0, 0, 8, i, 255, 0);
|
|
do_test (0, 0, 8, i, 255, -1);
|
|
do_test (0, 0, 8, i, 255, 1);
|
|
do_test (i, i, 8, i, 255, 0);
|
|
do_test (i, i, 8, i, 255, 1);
|
|
do_test (i, i, 8, i, 255, -1);
|
|
do_test (i, 2 * i, 8, i, 255, 0);
|
|
do_test (2 * i, i, 8, i, 255, 1);
|
|
do_test (i, 3 * i, 8, i, 255, -1);
|
|
}
|
|
|
|
for (i = 1; i < 8; ++i)
|
|
{
|
|
do_test (0, 0, 8 << i, 16 << i, 127, 0);
|
|
do_test (0, 0, 8 << i, 16 << i, 127, 1);
|
|
do_test (0, 0, 8 << i, 16 << i, 127, -1);
|
|
do_test (0, 0, 8 << i, 16 << i, 255, 0);
|
|
do_test (0, 0, 8 << i, 16 << i, 255, 1);
|
|
do_test (0, 0, 8 << i, 16 << i, 255, -1);
|
|
do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 0);
|
|
do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 1);
|
|
do_test (2 * i, i, 8 << i, 16 << i, 255, 0);
|
|
do_test (2 * i, i, 8 << i, 16 << i, 255, 1);
|
|
}
|
|
|
|
do_test_limit (0, 0, 0, 0, 127, 0);
|
|
do_test_limit (4, 0, 21, 20, 127, 0);
|
|
do_test_limit (0, 4, 21, 20, 127, 0);
|
|
do_test_limit (8, 0, 25, 24, 127, 0);
|
|
do_test_limit (0, 8, 25, 24, 127, 0);
|
|
|
|
for (i = 0; i < 8; ++i)
|
|
{
|
|
do_test_limit (0, 0, 17 - i, 16 - i, 127, 0);
|
|
do_test_limit (0, 0, 17 - i, 16 - i, 255, 0);
|
|
do_test_limit (0, 0, 15 - i, 16 - i, 127, 0);
|
|
do_test_limit (0, 0, 15 - i, 16 - i, 127, 1);
|
|
do_test_limit (0, 0, 15 - i, 16 - i, 127, -1);
|
|
do_test_limit (0, 0, 15 - i, 16 - i, 255, 0);
|
|
do_test_limit (0, 0, 15 - i, 16 - i, 255, 1);
|
|
do_test_limit (0, 0, 15 - i, 16 - i, 255, -1);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|