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glibc/benchtests/bench-strcmp.c
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/* Measure strcmp and wcscmp functions. | |
Copyright (C) 2013-2016 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 "wcscmp" | |
#else | |
# define TEST_NAME "strcmp" | |
#endif | |
#include "bench-string.h" | |
#ifdef WIDE | |
# include <wchar.h> | |
# define L(str) L##str | |
# define STRCMP wcscmp | |
# define STRCPY wcscpy | |
# define STRLEN wcslen | |
# define MEMCPY wmemcpy | |
# define SIMPLE_STRCMP simple_wcscmp | |
# define STUPID_STRCMP stupid_wcscmp | |
# define CHAR wchar_t | |
# define UCHAR wchar_t | |
# define CHARBYTES 4 | |
# define CHARBYTESLOG 2 | |
# define CHARALIGN __alignof__ (CHAR) | |
# define MIDCHAR 0x7fffffff | |
# define LARGECHAR 0xfffffffe | |
# define CHAR__MAX WCHAR_MAX | |
# define CHAR__MIN WCHAR_MIN | |
/* Wcscmp uses signed semantics for comparison, not unsigned */ | |
/* Avoid using substraction since possible overflow */ | |
int | |
simple_wcscmp (const wchar_t *s1, const wchar_t *s2) | |
{ | |
wchar_t c1, c2; | |
do | |
{ | |
c1 = *s1++; | |
c2 = *s2++; | |
if (c2 == L'\0') | |
return c1 - c2; | |
} | |
while (c1 == c2); | |
return c1 < c2 ? -1 : 1; | |
} | |
int | |
stupid_wcscmp (const wchar_t *s1, const wchar_t *s2) | |
{ | |
size_t ns1 = wcslen (s1) + 1; | |
size_t ns2 = wcslen (s2) + 1; | |
size_t n = ns1 < ns2 ? ns1 : ns2; | |
int ret = 0; | |
wchar_t c1, c2; | |
while (n--) { | |
c1 = *s1++; | |
c2 = *s2++; | |
if ((ret = c1 < c2 ? -1 : c1 == c2 ? 0 : 1) != 0) | |
break; | |
} | |
return ret; | |
} | |
#else | |
# include <limits.h> | |
# define L(str) str | |
# define STRCMP strcmp | |
# define STRCPY strcpy | |
# define STRLEN strlen | |
# define MEMCPY memcpy | |
# define SIMPLE_STRCMP simple_strcmp | |
# define STUPID_STRCMP stupid_strcmp | |
# define CHAR char | |
# define UCHAR unsigned char | |
# define CHARBYTES 1 | |
# define CHARBYTESLOG 0 | |
# define CHARALIGN 1 | |
# define MIDCHAR 0x7f | |
# define LARGECHAR 0xfe | |
# define CHAR__MAX CHAR_MAX | |
# define CHAR__MIN CHAR_MIN | |
/* Strcmp uses unsigned semantics for comparison. */ | |
int | |
simple_strcmp (const char *s1, const char *s2) | |
{ | |
int ret; | |
while ((ret = *(unsigned char *) s1 - *(unsigned char*) s2++) == 0 && *s1++); | |
return ret; | |
} | |
int | |
stupid_strcmp (const char *s1, const char *s2) | |
{ | |
size_t ns1 = strlen (s1) + 1; | |
size_t ns2 = strlen (s2) + 1; | |
size_t n = ns1 < ns2 ? ns1 : ns2; | |
int ret = 0; | |
while (n--) | |
if ((ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) != 0) | |
break; | |
return ret; | |
} | |
#endif | |
typedef int (*proto_t) (const CHAR *, const CHAR *); | |
IMPL (STUPID_STRCMP, 1) | |
IMPL (SIMPLE_STRCMP, 1) | |
IMPL (STRCMP, 1) | |
static void | |
do_one_test (impl_t *impl, | |
const CHAR *s1, const CHAR *s2, | |
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); | |
} | |
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, int max_char, | |
int exp_result) | |
{ | |
size_t i; | |
CHAR *s1, *s2; | |
if (len == 0) | |
return; | |
align1 &= 63; | |
if (align1 + (len + 1) * CHARBYTES >= page_size) | |
return; | |
align2 &= 63; | |
if (align2 + (len + 1) * CHARBYTES >= page_size) | |
return; | |
/* Put them close to the end of page. */ | |
i = align1 + CHARBYTES * (len + 2); | |
s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1); | |
i = align2 + CHARBYTES * (len + 2); | |
s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16) + align2); | |
for (i = 0; i < len; i++) | |
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; | |
s1[len] = s2[len] = 0; | |
s1[len + 1] = 23; | |
s2[len + 1] = 24 + exp_result; | |
s2[len - 1] -= exp_result; | |
printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2); | |
FOR_EACH_IMPL (impl, 0) | |
do_one_test (impl, s1, s2, 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 = 1; i < 32; ++i) | |
{ | |
do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0); | |
do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1); | |
do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1); | |
} | |
for (i = 1; i < 10 + CHARBYTESLOG; ++i) | |
{ | |
do_test (0, 0, 2 << i, MIDCHAR, 0); | |
do_test (0, 0, 2 << i, LARGECHAR, 0); | |
do_test (0, 0, 2 << i, MIDCHAR, 1); | |
do_test (0, 0, 2 << i, LARGECHAR, 1); | |
do_test (0, 0, 2 << i, MIDCHAR, -1); | |
do_test (0, 0, 2 << i, LARGECHAR, -1); | |
do_test (0, CHARBYTES * i, 2 << i, MIDCHAR, 1); | |
do_test (CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, LARGECHAR, 1); | |
} | |
for (i = 1; i < 8; ++i) | |
{ | |
do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 0); | |
do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 0); | |
do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 1); | |
do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 1); | |
do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, -1); | |
do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1); | |
} | |
return ret; | |
} | |
#include "../test-skeleton.c" |