diff options
Diffstat (limited to 'benchtests/bench-strcmp.c')
| -rw-r--r-- | benchtests/bench-strcmp.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/benchtests/bench-strcmp.c b/benchtests/bench-strcmp.c new file mode 100644 index 0000000..63a3cd4 --- /dev/null +++ b/benchtests/bench-strcmp.c @@ -0,0 +1,247 @@ +/* Measure strcmp and wcscmp functions. + Copyright (C) 2013 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) +{ + if (HP_TIMING_AVAIL) + { + hp_timing_t start __attribute ((unused)); + hp_timing_t stop __attribute ((unused)); + hp_timing_t best_time = ~ (hp_timing_t) 0; + size_t i; + + for (i = 0; i < 32; ++i) + { + HP_TIMING_NOW (start); + CALL (impl, s1, s2); + HP_TIMING_NOW (stop); + HP_TIMING_BEST (best_time, start, stop); + } + + printf ("\t%zd", (size_t) best_time); + } +} + +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; + + if (HP_TIMING_AVAIL) + printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2); + + FOR_EACH_IMPL (impl, 0) + do_one_test (impl, s1, s2, exp_result); + + if (HP_TIMING_AVAIL) + 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" |