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Diffstat (limited to 'REORG.TODO/benchtests/bench-memchr.c')
| -rw-r--r-- | REORG.TODO/benchtests/bench-memchr.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/REORG.TODO/benchtests/bench-memchr.c b/REORG.TODO/benchtests/bench-memchr.c new file mode 100644 index 0000000000..92b5b7f986 --- /dev/null +++ b/REORG.TODO/benchtests/bench-memchr.c @@ -0,0 +1,171 @@ +/* Measure memchr 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/>. */ + +#ifndef WIDE +# define CHAR char +# define SMALL_CHAR 127 +#else +# include <wchar.h> +# define CHAR wchar_t +# define SMALL_CHAR 1273 +#endif /* WIDE */ + +#ifndef USE_AS_MEMRCHR +# define TEST_MAIN +# ifndef WIDE +# define TEST_NAME "memchr" +# else +# define TEST_NAME "wmemchr" +# endif /* WIDE */ +# include "bench-string.h" + +# ifndef WIDE +# define MEMCHR memchr +# define SIMPLE_MEMCHR simple_memchr +# else +# define MEMCHR wmemchr +# define SIMPLE_MEMCHR simple_wmemchr +# endif /* WIDE */ + +typedef CHAR *(*proto_t) (const CHAR *, int, size_t); +CHAR *SIMPLE_MEMCHR (const CHAR *, int, size_t); + +IMPL (SIMPLE_MEMCHR, 0) +IMPL (MEMCHR, 1) + +CHAR * +SIMPLE_MEMCHR (const CHAR *s, int c, size_t n) +{ + while (n--) + if (*s++ == (CHAR) c) + return (CHAR *) s - 1; + return NULL; +} +#endif /* !USE_AS_MEMRCHR */ + +static void +do_one_test (impl_t *impl, const CHAR *s, int c, size_t n, CHAR *exp_res) +{ + CHAR *res = CALL (impl, s, c, n); + size_t i, iters = INNER_LOOP_ITERS; + timing_t start, stop, cur; + + if (res != exp_res) + { + error (0, 0, "Wrong result in function %s %p %p", impl->name, + res, exp_res); + ret = 1; + return; + } + + TIMING_NOW (start); + for (i = 0; i < iters; ++i) + { + CALL (impl, s, c, n); + } + TIMING_NOW (stop); + + TIMING_DIFF (cur, start, stop); + + TIMING_PRINT_MEAN ((double) cur, (double) iters); +} + +static void +do_test (size_t align, size_t pos, size_t len, int seek_char) +{ + size_t i; + CHAR *result; + + align &= 7; + if ((align + len) * sizeof (CHAR) >= page_size) + return; + + CHAR *buf = (CHAR *) (buf1); + + for (i = 0; i < len; ++i) + { + buf[align + i] = 1 + 23 * i % SMALL_CHAR; + if (buf[align + i] == seek_char) + buf[align + i] = seek_char + 1; + } + buf[align + len] = 0; + + if (pos < len) + { + buf[align + pos] = seek_char; + buf[align + len] = -seek_char; + result = (CHAR *) (buf + align + pos); + } + else + { + result = NULL; + buf[align + len] = seek_char; + } + + printf ("Length %4zd, position %4zd, alignment %2zd:", + len, pos, align); + + FOR_EACH_IMPL (impl, 0) + do_one_test (impl, (CHAR *) (buf + align), seek_char, len, result); + + 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, 23); + do_test (i, 64, 256, 23); + do_test (0, 16 << i, 2048, 0); + do_test (i, 64, 256, 0); +#ifdef USE_AS_MEMRCHR + /* Also test the position close to the beginning for memrchr. */ + do_test (0, i, 256, 23); + do_test (0, i, 256, 0); + do_test (i, i, 256, 23); + do_test (i, i, 256, 0); +#endif + } + for (i = 1; i < 32; ++i) + { + do_test (0, i, i + 1, 23); + do_test (0, i, i + 1, 0); + do_test (i, i, i + 1, 23); + do_test (i, i, i + 1, 0); +#ifdef USE_AS_MEMRCHR + /* Also test the position close to the beginning for memrchr. */ + do_test (0, 1, i + 1, 23); + do_test (0, 2, i + 1, 0); +#endif + } + + return ret; +} + +#include <support/test-driver.c> |