2013-06-04 13:18:56 +02:00
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/* Measure memcmp functions.
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Copyright (C) 2013 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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#define TEST_MAIN
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#ifdef WIDE
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# define TEST_NAME "wmemcmp"
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#else
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# define TEST_NAME "memcmp"
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#endif
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#include "bench-string.h"
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#ifdef WIDE
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# include <inttypes.h>
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# include <wchar.h>
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# define MEMCMP wmemcmp
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# define MEMCPY wmemcpy
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# define SIMPLE_MEMCMP simple_wmemcmp
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# define CHAR wchar_t
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# define UCHAR wchar_t
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# define CHARBYTES 4
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# define CHAR__MIN WCHAR_MIN
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# define CHAR__MAX WCHAR_MAX
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int
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simple_wmemcmp (const wchar_t *s1, const wchar_t *s2, size_t n)
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{
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int ret = 0;
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/* Warning!
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wmemcmp has to use SIGNED comparison for elements.
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memcmp has to use UNSIGNED comparison for elemnts.
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*/
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while (n-- && (ret = *s1 < *s2 ? -1 : *s1 == *s2 ? 0 : 1) == 0) {s1++; s2++;}
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return ret;
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}
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#else
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# include <limits.h>
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# define MEMCMP memcmp
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# define MEMCPY memcpy
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# define SIMPLE_MEMCMP simple_memcmp
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# define CHAR char
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# define MAX_CHAR 255
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# define UCHAR unsigned char
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# define CHARBYTES 1
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# define CHAR__MIN CHAR_MIN
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# define CHAR__MAX CHAR_MAX
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int
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simple_memcmp (const char *s1, const char *s2, size_t n)
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{
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int ret = 0;
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while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0);
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return ret;
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}
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#endif
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typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
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IMPL (SIMPLE_MEMCMP, 0)
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IMPL (MEMCMP, 1)
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static void
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do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t len,
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int exp_result)
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{
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2013-09-02 15:13:50 +02:00
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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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2013-06-04 13:18:56 +02:00
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{
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2013-09-02 15:13:50 +02:00
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CALL (impl, s1, s2, len);
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2013-06-04 13:18:56 +02:00
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}
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2013-09-02 15:13:50 +02:00
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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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2013-06-04 13:18:56 +02:00
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}
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static void
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do_test (size_t align1, size_t align2, size_t len, int exp_result)
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{
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size_t i;
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CHAR *s1, *s2;
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if (len == 0)
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return;
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align1 &= 63;
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if (align1 + (len + 1) * CHARBYTES >= page_size)
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return;
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align2 &= 63;
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if (align2 + (len + 1) * CHARBYTES >= 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; i++)
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s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % CHAR__MAX;
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s1[len] = align1;
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s2[len] = align2;
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s2[len - 1] -= exp_result;
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2013-09-02 15:13:50 +02:00
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printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
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2013-06-04 13:18:56 +02:00
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s1, s2, len, exp_result);
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2013-09-02 15:13:50 +02:00
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putchar ('\n');
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2013-06-04 13:18:56 +02:00
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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 ("%23s", "");
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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 < 16; ++i)
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{
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do_test (i * CHARBYTES, i * CHARBYTES, i, 0);
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do_test (i * CHARBYTES, i * CHARBYTES, i, 1);
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do_test (i * CHARBYTES, i * CHARBYTES, i, -1);
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}
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for (i = 0; i < 16; ++i)
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{
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do_test (0, 0, i, 0);
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do_test (0, 0, i, 1);
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do_test (0, 0, i, -1);
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}
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for (i = 1; i < 10; ++i)
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{
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do_test (0, 0, 2 << i, 0);
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do_test (0, 0, 2 << i, 1);
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do_test (0, 0, 2 << i, -1);
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do_test (0, 0, 16 << i, 0);
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do_test ((8 - i) * CHARBYTES, (2 * i) * CHARBYTES, 16 << i, 0);
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do_test (0, 0, 16 << i, 1);
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do_test (0, 0, 16 << i, -1);
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}
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for (i = 1; i < 8; ++i)
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{
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do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 0);
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do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 1);
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do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, -1);
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}
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return ret;
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}
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#include "../test-skeleton.c"
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