mirror of git://sourceware.org/git/glibc.git
131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/* Measure memccpy functions.
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Copyright (C) 2013-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#define TEST_MAIN
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#define TEST_NAME "memccpy"
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#include "bench-string.h"
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void *
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generic_memccpy (void *dst, const void *src, int c, size_t n)
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{
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void *p = memchr (src, c, n);
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if (p != NULL)
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return mempcpy (dst, src, p - src + 1);
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memcpy (dst, src, n);
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return NULL;
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}
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IMPL (memccpy, 1)
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IMPL (generic_memccpy, 0)
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typedef void *(*proto_t) (void *, const void *, int c, size_t);
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static void
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do_one_test (impl_t *impl, void *dst, const void *src, int c, size_t len,
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size_t n)
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{
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size_t i, iters = INNER_LOOP_ITERS_LARGE * 4;
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timing_t start, stop, cur;
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TIMING_NOW (start);
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for (i = 0; i < iters; ++i)
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{
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CALL (impl, dst, src, c, n);
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}
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TIMING_NOW (stop);
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TIMING_DIFF (cur, start, stop);
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TIMING_PRINT_MEAN ((double) cur, (double) iters);
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}
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static void
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do_test (size_t align1, size_t align2, int c, size_t len, size_t n,
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int max_char)
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{
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size_t i;
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char *s1, *s2;
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align1 &= 7;
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if (align1 + len >= page_size)
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return;
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align2 &= 7;
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if (align2 + len >= page_size)
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return;
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s1 = (char *) (buf1 + align1);
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s2 = (char *) (buf2 + align2);
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for (i = 0; i < len - 1; ++i)
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{
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s1[i] = 32 + 23 * i % (max_char - 32);
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if (s1[i] == (char) c)
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--s1[i];
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}
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s1[len - 1] = c;
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for (i = len; i + align1 < page_size && i < len + 64; ++i)
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s1[i] = 32 + 32 * i % (max_char - 32);
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printf ("Length %4zd, n %4zd, char %d, alignment %2zd/%2zd:", len, n, c, align1, align2);
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s2, s1, c, len, n);
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putchar ('\n');
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}
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int
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test_main (void)
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{
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size_t i;
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test_init ();
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printf ("%28s", "");
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FOR_EACH_IMPL (impl, 0)
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printf ("\t%s", impl->name);
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putchar ('\n');
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for (i = 1; i < 8; ++i)
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{
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do_test (i, i, 12, 16, 16, 127);
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do_test (i, i, 23, 16, 16, 255);
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do_test (i, 2 * i, 28, 16, 16, 127);
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do_test (2 * i, i, 31, 16, 16, 255);
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do_test (8 - i, 2 * i, 1, 1 << i, 2 << i, 127);
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do_test (2 * i, 8 - i, 17, 2 << i, 1 << i, 127);
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do_test (8 - i, 2 * i, 0, 1 << i, 2 << i, 255);
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do_test (2 * i, 8 - i, i, 2 << i, 1 << i, 255);
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}
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for (i = 1; i < 8; ++i)
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{
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do_test (0, 0, i, 4 << i, 8 << i, 127);
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do_test (0, 0, i, 16 << i, 8 << i, 127);
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do_test (8 - i, 2 * i, i, 4 << i, 8 << i, 127);
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do_test (8 - i, 2 * i, i, 16 << i, 8 << i, 127);
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}
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return ret;
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}
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#include <support/test-driver.c>
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