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Diffstat (limited to 'REORG.TODO/benchtests/bench-memcmp.c')
| -rw-r--r-- | REORG.TODO/benchtests/bench-memcmp.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/REORG.TODO/benchtests/bench-memcmp.c b/REORG.TODO/benchtests/bench-memcmp.c new file mode 100644 index 0000000000..84cba9a274 --- /dev/null +++ b/REORG.TODO/benchtests/bench-memcmp.c @@ -0,0 +1,178 @@ +/* Measure memcmp 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 "wmemcmp" +#else +# define TEST_NAME "memcmp" +#endif +#include "bench-string.h" +#ifdef WIDE +# include <inttypes.h> +# include <wchar.h> + +# define MEMCMP wmemcmp +# define MEMCPY wmemcpy +# define SIMPLE_MEMCMP simple_wmemcmp +# define CHAR wchar_t +# define UCHAR wchar_t +# define CHARBYTES 4 +# define CHAR__MIN WCHAR_MIN +# define CHAR__MAX WCHAR_MAX +int +simple_wmemcmp (const wchar_t *s1, const wchar_t *s2, size_t n) +{ + int ret = 0; + /* Warning! + wmemcmp has to use SIGNED comparison for elements. + memcmp has to use UNSIGNED comparison for elemnts. + */ + while (n-- && (ret = *s1 < *s2 ? -1 : *s1 == *s2 ? 0 : 1) == 0) {s1++; s2++;} + return ret; +} +#else +# include <limits.h> + +# define MEMCMP memcmp +# define MEMCPY memcpy +# define SIMPLE_MEMCMP simple_memcmp +# define CHAR char +# define MAX_CHAR 255 +# define UCHAR unsigned char +# define CHARBYTES 1 +# define CHAR__MIN CHAR_MIN +# define CHAR__MAX CHAR_MAX + +int +simple_memcmp (const char *s1, const char *s2, size_t n) +{ + int ret = 0; + + while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0); + return ret; +} +#endif + +typedef int (*proto_t) (const CHAR *, const CHAR *, size_t); + +IMPL (SIMPLE_MEMCMP, 0) +IMPL (MEMCMP, 1) + +static void +do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t len, + 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, len); + } + 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 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; + + s1 = (CHAR *) (buf1 + align1); + s2 = (CHAR *) (buf2 + align2); + + for (i = 0; i < len; i++) + s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % CHAR__MAX; + + s1[len] = align1; + s2[len] = align2; + 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, len, 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 < 16; ++i) + { + do_test (i * CHARBYTES, i * CHARBYTES, i, 0); + do_test (i * CHARBYTES, i * CHARBYTES, i, 1); + do_test (i * CHARBYTES, i * CHARBYTES, i, -1); + } + + for (i = 0; i < 16; ++i) + { + do_test (0, 0, i, 0); + do_test (0, 0, i, 1); + do_test (0, 0, i, -1); + } + + for (i = 1; i < 10; ++i) + { + do_test (0, 0, 2 << i, 0); + do_test (0, 0, 2 << i, 1); + do_test (0, 0, 2 << i, -1); + do_test (0, 0, 16 << i, 0); + do_test ((8 - i) * CHARBYTES, (2 * i) * CHARBYTES, 16 << i, 0); + do_test (0, 0, 16 << i, 1); + do_test (0, 0, 16 << i, -1); + } + + for (i = 1; i < 8; ++i) + { + do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 0); + do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 1); + do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, -1); + } + + return ret; +} + +#include <support/test-driver.c> |