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Diffstat (limited to 'benchtests/bench-strchr.c')
| -rw-r--r-- | benchtests/bench-strchr.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/benchtests/bench-strchr.c b/benchtests/bench-strchr.c new file mode 100644 index 0000000000..710b59203d --- /dev/null +++ b/benchtests/bench-strchr.c @@ -0,0 +1,206 @@ +/* Measure STRCHR 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 +#ifndef WIDE +# ifdef USE_FOR_STRCHRNUL +# define TEST_NAME "strchrnul" +# else +# define TEST_NAME "strchr" +# endif +#else +# define TEST_NAME "wcschr" +#endif +#include "bench-string.h" + +#ifndef WIDE +# ifdef USE_FOR_STRCHRNUL +# define STRCHR strchrnul +# define stupid_STRCHR stupid_STRCHRNUL +# define simple_STRCHR simple_STRCHRNUL +# else +# define STRCHR strchr +# endif +# define STRLEN strlen +# define CHAR char +# define BIG_CHAR CHAR_MAX +# define MIDDLE_CHAR 127 +# define SMALL_CHAR 23 +# define UCHAR unsigned char +#else +# include <wchar.h> +# define STRCHR wcschr +# define STRLEN wcslen +# define CHAR wchar_t +# define BIG_CHAR WCHAR_MAX +# define MIDDLE_CHAR 1121 +# define SMALL_CHAR 851 +# define UCHAR wchar_t +#endif + +#ifdef USE_FOR_STRCHRNUL +# define NULLRET(endptr) endptr +#else +# define NULLRET(endptr) NULL +#endif + + +typedef CHAR *(*proto_t) (const CHAR *, int); + +CHAR * +simple_STRCHR (const CHAR *s, int c) +{ + for (; *s != (CHAR) c; ++s) + if (*s == '\0') + return NULLRET ((CHAR *) s); + return (CHAR *) s; +} + +CHAR * +stupid_STRCHR (const CHAR *s, int c) +{ + size_t n = STRLEN (s) + 1; + + while (n--) + if (*s++ == (CHAR) c) + return (CHAR *) s - 1; + return NULLRET ((CHAR *) s - 1); +} + +IMPL (stupid_STRCHR, 0) +IMPL (simple_STRCHR, 0) +IMPL (STRCHR, 1) + +static void +do_one_test (impl_t *impl, const CHAR *s, int c, const CHAR *exp_res) +{ + 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, s, c); + HP_TIMING_NOW (stop); + HP_TIMING_BEST (best_time, start, stop); + } + + printf ("\t%zd", (size_t) best_time); + } +} + +static void +do_test (size_t align, size_t pos, size_t len, int seek_char, int max_char) +/* For wcschr: align here means align not in bytes, + but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t)) + len for wcschr here isn't in bytes but it's number of wchar_t symbols. */ +{ + size_t i; + CHAR *result; + CHAR *buf = (CHAR *) buf1; + align &= 15; + if ((align + len) * sizeof (CHAR) >= page_size) + return; + + for (i = 0; i < len; ++i) + { + buf[align + i] = 32 + 23 * i % max_char; + if (buf[align + i] == seek_char) + buf[align + i] = seek_char + 1; + else if (buf[align + i] == 0) + buf[align + i] = 1; + } + buf[align + len] = 0; + + if (pos < len) + { + buf[align + pos] = seek_char; + result = buf + align + pos; + } + else if (seek_char == 0) + result = buf + align + len; + else + result = NULLRET (buf + align + len); + + if (HP_TIMING_AVAIL) + printf ("Length %4zd, alignment in bytes %2zd:", + pos, align * sizeof (CHAR)); + + FOR_EACH_IMPL (impl, 0) + do_one_test (impl, buf + align, seek_char, result); + + if (HP_TIMING_AVAIL) + putchar ('\n'); +} + +int +test_main (void) +{ + size_t i; + + test_init (); + + printf ("%20s", ""); + FOR_EACH_IMPL (impl, 0) + printf ("\t%s", impl->name); + putchar ('\n'); + + for (i = 1; i < 8; ++i) + { + do_test (0, 16 << i, 2048, SMALL_CHAR, MIDDLE_CHAR); + do_test (i, 16 << i, 2048, SMALL_CHAR, MIDDLE_CHAR); + } + + for (i = 1; i < 8; ++i) + { + do_test (i, 64, 256, SMALL_CHAR, MIDDLE_CHAR); + do_test (i, 64, 256, SMALL_CHAR, BIG_CHAR); + } + + for (i = 0; i < 32; ++i) + { + do_test (0, i, i + 1, SMALL_CHAR, MIDDLE_CHAR); + do_test (0, i, i + 1, SMALL_CHAR, BIG_CHAR); + } + + for (i = 1; i < 8; ++i) + { + do_test (0, 16 << i, 2048, 0, MIDDLE_CHAR); + do_test (i, 16 << i, 2048, 0, MIDDLE_CHAR); + } + + for (i = 1; i < 8; ++i) + { + do_test (i, 64, 256, 0, MIDDLE_CHAR); + do_test (i, 64, 256, 0, BIG_CHAR); + } + + for (i = 0; i < 32; ++i) + { + do_test (0, i, i + 1, 0, MIDDLE_CHAR); + do_test (0, i, i + 1, 0, BIG_CHAR); + } + + return ret; +} + +#include "../test-skeleton.c" |