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Diffstat (limited to 'benchtests/bench-memccpy.c')
| -rw-r--r-- | benchtests/bench-memccpy.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/benchtests/bench-memccpy.c b/benchtests/bench-memccpy.c new file mode 100644 index 0000000..612513c --- /dev/null +++ b/benchtests/bench-memccpy.c @@ -0,0 +1,169 @@ +/* Measure memccpy 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 "memccpy" +#include "bench-string.h" + +void *simple_memccpy (void *, const void *, int, size_t); +void *stupid_memccpy (void *, const void *, int, size_t); + +IMPL (stupid_memccpy, 0) +IMPL (simple_memccpy, 0) +IMPL (memccpy, 1) + +void * +simple_memccpy (void *dst, const void *src, int c, size_t n) +{ + const char *s = src; + char *d = dst; + + while (n-- > 0) + if ((*d++ = *s++) == (char) c) + return d; + + return NULL; +} + +void * +stupid_memccpy (void *dst, const void *src, int c, size_t n) +{ + void *p = memchr (src, c, n); + + if (p != NULL) + return mempcpy (dst, src, p - src + 1); + + memcpy (dst, src, n); + return NULL; +} + +typedef void *(*proto_t) (void *, const void *, int c, size_t); + +static void +do_one_test (impl_t *impl, void *dst, const void *src, int c, size_t len, + size_t n) +{ + void *expect = len > n ? NULL : (char *) dst + len; + if (CALL (impl, dst, src, c, n) != expect) + { + error (0, 0, "Wrong result in function %s %p %p", impl->name, + CALL (impl, dst, src, c, n), expect); + ret = 1; + return; + } + + if (memcmp (dst, src, len > n ? n : len) != 0) + { + error (0, 0, "Wrong result in function %s", impl->name); + 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, dst, src, c, n); + 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, int c, size_t len, size_t n, + int max_char) +{ + size_t i; + char *s1, *s2; + + align1 &= 7; + if (align1 + len >= page_size) + return; + + align2 &= 7; + if (align2 + len >= page_size) + return; + + s1 = (char *) (buf1 + align1); + s2 = (char *) (buf2 + align2); + + for (i = 0; i < len - 1; ++i) + { + s1[i] = 32 + 23 * i % (max_char - 32); + if (s1[i] == (char) c) + --s1[i]; + } + s1[len - 1] = c; + for (i = len; i + align1 < page_size && i < len + 64; ++i) + s1[i] = 32 + 32 * i % (max_char - 32); + + if (HP_TIMING_AVAIL) + printf ("Length %4zd, n %4zd, char %d, alignment %2zd/%2zd:", len, n, c, align1, align2); + + FOR_EACH_IMPL (impl, 0) + do_one_test (impl, s2, s1, c, len, n); + + if (HP_TIMING_AVAIL) + putchar ('\n'); +} + +int +test_main (void) +{ + size_t i; + + test_init (); + + printf ("%28s", ""); + FOR_EACH_IMPL (impl, 0) + printf ("\t%s", impl->name); + putchar ('\n'); + + for (i = 1; i < 8; ++i) + { + do_test (i, i, 12, 16, 16, 127); + do_test (i, i, 23, 16, 16, 255); + do_test (i, 2 * i, 28, 16, 16, 127); + do_test (2 * i, i, 31, 16, 16, 255); + do_test (8 - i, 2 * i, 1, 1 << i, 2 << i, 127); + do_test (2 * i, 8 - i, 17, 2 << i, 1 << i, 127); + do_test (8 - i, 2 * i, 0, 1 << i, 2 << i, 255); + do_test (2 * i, 8 - i, i, 2 << i, 1 << i, 255); + } + + for (i = 1; i < 8; ++i) + { + do_test (0, 0, i, 4 << i, 8 << i, 127); + do_test (0, 0, i, 16 << i, 8 << i, 127); + do_test (8 - i, 2 * i, i, 4 << i, 8 << i, 127); + do_test (8 - i, 2 * i, i, 16 << i, 8 << i, 127); + } + + return ret; +} + +#include "../test-skeleton.c" |