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author | Siddhesh Poyarekar <siddhesh@redhat.com> | 2013-06-04 16:48:56 +0530 |
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committer | Siddhesh Poyarekar <siddhesh@redhat.com> | 2013-06-11 15:08:13 +0530 |
commit | 9702047480d9002522936c5e1e1ebe16f696880d (patch) | |
tree | 9b37e288e4d57012a6186c280fd8837deca6dd4c /benchtests/bench-rawmemchr.c | |
parent | c1f75dc386d533806d29b7e94118363a7b50eed8 (diff) | |
download | glibc-9702047480d9002522936c5e1e1ebe16f696880d.zip glibc-9702047480d9002522936c5e1e1ebe16f696880d.tar.gz glibc-9702047480d9002522936c5e1e1ebe16f696880d.tar.bz2 |
Copy over string performance tests into benchtests
Copy over already existing string performance tests into benchtests.
Bits not related to performance measurements have been omitted.
Diffstat (limited to 'benchtests/bench-rawmemchr.c')
-rw-r--r-- | benchtests/bench-rawmemchr.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/benchtests/bench-rawmemchr.c b/benchtests/bench-rawmemchr.c new file mode 100644 index 0000000..a6b29d7 --- /dev/null +++ b/benchtests/bench-rawmemchr.c @@ -0,0 +1,133 @@ +/* Measure memchr 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/>. */ + +#include <assert.h> + +#define TEST_MAIN +#define TEST_NAME "rawmemchr" +#include "bench-string.h" + +typedef char *(*proto_t) (const char *, int); +char *simple_rawmemchr (const char *, int); + +IMPL (simple_rawmemchr, 0) +IMPL (rawmemchr, 1) + +char * +simple_rawmemchr (const char *s, int c) +{ + while (1) + if (*s++ == (char) c) + return (char *) s - 1; + return NULL; +} + +static void +do_one_test (impl_t *impl, const char *s, int c, char *exp_res) +{ + char *res = CALL (impl, s, c); + if (res != exp_res) + { + error (0, 0, "Wrong result in function %s %p %p", impl->name, + res, exp_res); + ret = 1; + return; + } + + 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) +{ + size_t i; + char *result; + + align &= 7; + if (align + len >= page_size) + return; + + for (i = 0; i < len; ++i) + { + buf1[align + i] = 1 + 23 * i % 127; + if (buf1[align + i] == seek_char) + buf1[align + i] = seek_char + 1; + } + buf1[align + len] = 0; + + assert (pos < len); + + buf1[align + pos] = seek_char; + buf1[align + len] = -seek_char; + result = (char *) (buf1 + align + pos); + + if (HP_TIMING_AVAIL) + printf ("Length %4zd, alignment %2zd:", pos, align); + + FOR_EACH_IMPL (impl, 0) + do_one_test (impl, (char *) (buf1 + 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 < 7; ++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); + } + for (i = 1; i < 32; ++i) + { + do_test (0, i, i + 1, 23); + do_test (0, i, i + 1, 0); + } + + return ret; +} + +#include "../test-skeleton.c" |