155 lines
3.4 KiB
C
155 lines
3.4 KiB
C
/* Measure memchr functions.
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Copyright (C) 2013-2019 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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<http://www.gnu.org/licenses/>. */
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#ifndef WIDE
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# define SMALL_CHAR 127
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#else
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# define SMALL_CHAR 1273
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#endif /* WIDE */
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#ifndef USE_AS_MEMRCHR
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# define TEST_MAIN
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# ifndef WIDE
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# define TEST_NAME "memchr"
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# else
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# define TEST_NAME "wmemchr"
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# endif /* WIDE */
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# include "bench-string.h"
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# ifndef WIDE
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# define SIMPLE_MEMCHR simple_memchr
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# else
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# define SIMPLE_MEMCHR simple_wmemchr
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# endif /* WIDE */
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typedef CHAR *(*proto_t) (const CHAR *, int, size_t);
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CHAR *SIMPLE_MEMCHR (const CHAR *, int, size_t);
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IMPL (SIMPLE_MEMCHR, 0)
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IMPL (MEMCHR, 1)
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CHAR *
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SIMPLE_MEMCHR (const CHAR *s, int c, size_t n)
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{
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while (n--)
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if (*s++ == (CHAR) c)
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return (CHAR *) s - 1;
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return NULL;
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}
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#endif /* !USE_AS_MEMRCHR */
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static void
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do_one_test (impl_t *impl, const CHAR *s, int c, size_t n)
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{
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size_t i, iters = INNER_LOOP_ITERS;
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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, s, 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 align, size_t pos, size_t len, int seek_char)
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{
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size_t i;
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align &= 7;
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if ((align + len) * sizeof (CHAR) >= page_size)
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return;
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CHAR *buf = (CHAR *) (buf1);
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for (i = 0; i < len; ++i)
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{
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buf[align + i] = 1 + 23 * i % SMALL_CHAR;
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if (buf[align + i] == seek_char)
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buf[align + i] = seek_char + 1;
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}
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buf[align + len] = 0;
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if (pos < len)
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{
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buf[align + pos] = seek_char;
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buf[align + len] = -seek_char;
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}
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else
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{
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buf[align + len] = seek_char;
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}
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printf ("Length %4zd, position %4zd, alignment %2zd:",
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len, pos, align);
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, (CHAR *) (buf + align), seek_char, len);
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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 ("%20s", "");
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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 (0, 16 << i, 2048, 23);
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do_test (i, 64, 256, 23);
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do_test (0, 16 << i, 2048, 0);
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do_test (i, 64, 256, 0);
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#ifdef USE_AS_MEMRCHR
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/* Also test the position close to the beginning for memrchr. */
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do_test (0, i, 256, 23);
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do_test (0, i, 256, 0);
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do_test (i, i, 256, 23);
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do_test (i, i, 256, 0);
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#endif
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}
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for (i = 1; i < 32; ++i)
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{
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do_test (0, i, i + 1, 23);
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do_test (0, i, i + 1, 0);
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do_test (i, i, i + 1, 23);
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do_test (i, i, i + 1, 0);
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#ifdef USE_AS_MEMRCHR
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/* Also test the position close to the beginning for memrchr. */
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do_test (0, 1, i + 1, 23);
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do_test (0, 2, i + 1, 0);
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#endif
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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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