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Diffstat (limited to 'benchtests/bench-memcpy.c')
| -rw-r--r-- | benchtests/bench-memcpy.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/benchtests/bench-memcpy.c b/benchtests/bench-memcpy.c new file mode 100644 index 0000000000..1b126711f8 --- /dev/null +++ b/benchtests/bench-memcpy.c @@ -0,0 +1,163 @@ +/* Measure memcpy 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/>. */ + +#ifndef MEMCPY_RESULT +# define MEMCPY_RESULT(dst, len) dst +# define MIN_PAGE_SIZE 131072 +# define TEST_MAIN +# define TEST_NAME "memcpy" +# include "bench-string.h" + +char *simple_memcpy (char *, const char *, size_t); +char *builtin_memcpy (char *, const char *, size_t); + +IMPL (simple_memcpy, 0) +IMPL (builtin_memcpy, 0) +IMPL (memcpy, 1) + +char * +simple_memcpy (char *dst, const char *src, size_t n) +{ + char *ret = dst; + while (n--) + *dst++ = *src++; + return ret; +} + +char * +builtin_memcpy (char *dst, const char *src, size_t n) +{ + return __builtin_memcpy (dst, src, n); +} +#endif + +typedef char *(*proto_t) (char *, const char *, size_t); + +static void +do_one_test (impl_t *impl, char *dst, const char *src, + size_t len) +{ + if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len)) + { + error (0, 0, "Wrong result in function %s %p %p", impl->name, + CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len)); + ret = 1; + return; + } + + if (memcmp (dst, src, len) != 0) + { + error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"", + impl->name, dst, src); + 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, len); + 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 len) +{ + size_t i, j; + char *s1, *s2; + + align1 &= 63; + if (align1 + len >= page_size) + return; + + align2 &= 63; + if (align2 + len >= page_size) + return; + + s1 = (char *) (buf1 + align1); + s2 = (char *) (buf2 + align2); + + for (i = 0, j = 1; i < len; i++, j += 23) + s1[i] = j; + + if (HP_TIMING_AVAIL) + printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2); + + FOR_EACH_IMPL (impl, 0) + do_one_test (impl, s2, s1, len); + + if (HP_TIMING_AVAIL) + 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 = 0; i < 18; ++i) + { + do_test (0, 0, 1 << i); + do_test (i, 0, 1 << i); + do_test (0, i, 1 << i); + do_test (i, i, 1 << i); + } + + for (i = 0; i < 32; ++i) + { + do_test (0, 0, i); + do_test (i, 0, i); + do_test (0, i, i); + do_test (i, i, i); + } + + for (i = 3; i < 32; ++i) + { + if ((i & (i - 1)) == 0) + continue; + do_test (0, 0, 16 * i); + do_test (i, 0, 16 * i); + do_test (0, i, 16 * i); + do_test (i, i, 16 * i); + } + + do_test (0, 0, getpagesize ()); + + return ret; +} + +#include "../test-skeleton.c" |