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Diffstat (limited to 'benchtests/bench-strstr.c')
| -rw-r--r-- | benchtests/bench-strstr.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/benchtests/bench-strstr.c b/benchtests/bench-strstr.c new file mode 100644 index 0000000000..91a8dfed6a --- /dev/null +++ b/benchtests/bench-strstr.c @@ -0,0 +1,183 @@ +/* Measure strstr 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 +#define TEST_NAME "strstr" +#include "bench-string.h" + + +#define STRSTR simple_strstr +#include "../string/strstr.c" + + +static char * +stupid_strstr (const char *s1, const char *s2) +{ + ssize_t s1len = strlen (s1); + ssize_t s2len = strlen (s2); + + if (s2len > s1len) + return NULL; + + for (ssize_t i = 0; i <= s1len - s2len; ++i) + { + size_t j; + for (j = 0; j < s2len; ++j) + if (s1[i + j] != s2[j]) + break; + if (j == s2len) + return (char *) s1 + i; + } + + return NULL; +} + + +typedef char *(*proto_t) (const char *, const char *); + +IMPL (stupid_strstr, 0) +IMPL (simple_strstr, 0) +IMPL (strstr, 1) + + +static void +do_one_test (impl_t *impl, const char *s1, const char *s2, char *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 len1, size_t len2, + int fail) +{ + char *s1 = (char *) (buf1 + align1); + char *s2 = (char *) (buf2 + align2); + + static const char d[] = "1234567890abcdef"; +#define dl (sizeof (d) - 1) + char *ss2 = s2; + for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0) + { + size_t t = l > dl ? dl : l; + ss2 = mempcpy (ss2, d, t); + } + s2[len2] = '\0'; + + if (fail) + { + char *ss1 = s1; + for (size_t l = len1; l > 0; l = l > dl ? l - dl : 0) + { + size_t t = l > dl ? dl : l; + memcpy (ss1, d, t); + ++ss1[len2 > 7 ? 7 : len2 - 1]; + ss1 += t; + } + } + else + { + memset (s1, '0', len1); + memcpy (s1 + len1 - len2, s2, len2); + } + s1[len1] = '\0'; + + if (HP_TIMING_AVAIL) + printf ("Length %4zd/%zd, alignment %2zd/%2zd, %s:", + len1, len2, align1, align2, fail ? "fail" : "found"); + + FOR_EACH_IMPL (impl, 0) + do_one_test (impl, s1, s2, fail ? NULL : s1 + len1 - len2); + + if (HP_TIMING_AVAIL) + putchar ('\n'); +} + +static int +test_main (void) +{ + test_init (); + + printf ("%23s", ""); + FOR_EACH_IMPL (impl, 0) + printf ("\t%s", impl->name); + putchar ('\n'); + + for (size_t klen = 2; klen < 32; ++klen) + for (size_t hlen = 2 * klen; hlen < 16 * klen; hlen += klen) + { + do_test (0, 0, hlen, klen, 0); + do_test (0, 0, hlen, klen, 1); + do_test (0, 3, hlen, klen, 0); + do_test (0, 3, hlen, klen, 1); + do_test (0, 9, hlen, klen, 0); + do_test (0, 9, hlen, klen, 1); + do_test (0, 15, hlen, klen, 0); + do_test (0, 15, hlen, klen, 1); + + do_test (3, 0, hlen, klen, 0); + do_test (3, 0, hlen, klen, 1); + do_test (3, 3, hlen, klen, 0); + do_test (3, 3, hlen, klen, 1); + do_test (3, 9, hlen, klen, 0); + do_test (3, 9, hlen, klen, 1); + do_test (3, 15, hlen, klen, 0); + do_test (3, 15, hlen, klen, 1); + + do_test (9, 0, hlen, klen, 0); + do_test (9, 0, hlen, klen, 1); + do_test (9, 3, hlen, klen, 0); + do_test (9, 3, hlen, klen, 1); + do_test (9, 9, hlen, klen, 0); + do_test (9, 9, hlen, klen, 1); + do_test (9, 15, hlen, klen, 0); + do_test (9, 15, hlen, klen, 1); + + do_test (15, 0, hlen, klen, 0); + do_test (15, 0, hlen, klen, 1); + do_test (15, 3, hlen, klen, 0); + do_test (15, 3, hlen, klen, 1); + do_test (15, 9, hlen, klen, 0); + do_test (15, 9, hlen, klen, 1); + do_test (15, 15, hlen, klen, 0); + do_test (15, 15, hlen, klen, 1); + } + + do_test (0, 0, page_size - 1, 16, 0); + do_test (0, 0, page_size - 1, 16, 1); + + return ret; +} + +#include "../test-skeleton.c" |