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240 lines
5.8 KiB
C
240 lines
5.8 KiB
C
/* Measure strncmp functions.
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Copyright (C) 2013-2014 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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#define TEST_NAME "strncmp"
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#include "bench-string.h"
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typedef int (*proto_t) (const char *, const char *, size_t);
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int simple_strncmp (const char *, const char *, size_t);
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int stupid_strncmp (const char *, const char *, size_t);
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IMPL (stupid_strncmp, 0)
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IMPL (simple_strncmp, 0)
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IMPL (strncmp, 1)
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int
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simple_strncmp (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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&& *s1++);
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return ret;
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}
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int
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stupid_strncmp (const char *s1, const char *s2, size_t n)
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{
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size_t ns1 = strnlen (s1, n) + 1, ns2 = strnlen (s2, n) + 1;
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int ret = 0;
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n = ns1 < n ? ns1 : n;
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n = ns2 < n ? ns2 : n;
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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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static void
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do_one_test (impl_t *impl, const char *s1, const char *s2, size_t n,
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int exp_result)
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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, s1, s2, 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_limit (size_t align1, size_t align2, size_t len, size_t n, int max_char,
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int exp_result)
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{
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size_t i, align_n;
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char *s1, *s2;
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if (n == 0)
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{
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s1 = (char*)(buf1 + page_size);
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s2 = (char*)(buf2 + page_size);
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printf ("Length %4zd/%4zd:", len, n);
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s1, s2, n, 0);
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putchar ('\n');
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return;
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}
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align1 &= 15;
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align2 &= 15;
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align_n = (page_size - n) & 15;
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s1 = (char*)(buf1 + page_size - n);
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s2 = (char*)(buf2 + page_size - n);
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if (align1 < align_n)
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s1 -= (align_n - align1);
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if (align2 < align_n)
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s2 -= (align_n - align2);
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for (i = 0; i < n; i++)
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s1[i] = s2[i] = 1 + 23 * i % max_char;
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if (len < n)
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{
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s1[len] = 0;
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s2[len] = 0;
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if (exp_result < 0)
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s2[len] = 32;
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else if (exp_result > 0)
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s1[len] = 64;
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}
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printf ("Length %4zd/%4zd, alignment %2zd/%2zd:", len, n, align1, align2);
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s1, s2, n, exp_result);
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putchar ('\n');
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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, size_t n, int max_char,
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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 (n == 0)
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return;
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align1 &= 7;
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if (align1 + n + 1 >= page_size)
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return;
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align2 &= 7;
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if (align2 + n + 1 >= 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 < n; i++)
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s1[i] = s2[i] = 1 + 23 * i % max_char;
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s1[n] = 24 + exp_result;
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s2[n] = 23;
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s1[len] = 0;
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s2[len] = 0;
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if (exp_result < 0)
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s2[len] = 32;
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else if (exp_result > 0)
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s1[len] = 64;
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if (len >= n)
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s2[n - 1] -= exp_result;
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printf ("Length %4zd/%4zd, alignment %2zd/%2zd:", len, n, align1, align2);
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, (char*)s1, (char*)s2, n, exp_result);
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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 ("%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 =0; i < 16; ++i)
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{
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do_test (0, 0, 8, i, 127, 0);
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do_test (0, 0, 8, i, 127, -1);
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do_test (0, 0, 8, i, 127, 1);
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do_test (i, i, 8, i, 127, 0);
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do_test (i, i, 8, i, 127, 1);
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do_test (i, i, 8, i, 127, -1);
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do_test (i, 2 * i, 8, i, 127, 0);
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do_test (2 * i, i, 8, i, 127, 1);
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do_test (i, 3 * i, 8, i, 127, -1);
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do_test (0, 0, 8, i, 255, 0);
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do_test (0, 0, 8, i, 255, -1);
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do_test (0, 0, 8, i, 255, 1);
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do_test (i, i, 8, i, 255, 0);
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do_test (i, i, 8, i, 255, 1);
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do_test (i, i, 8, i, 255, -1);
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do_test (i, 2 * i, 8, i, 255, 0);
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do_test (2 * i, i, 8, i, 255, 1);
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do_test (i, 3 * i, 8, i, 255, -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 (0, 0, 8 << i, 16 << i, 127, 0);
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do_test (0, 0, 8 << i, 16 << i, 127, 1);
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do_test (0, 0, 8 << i, 16 << i, 127, -1);
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do_test (0, 0, 8 << i, 16 << i, 255, 0);
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do_test (0, 0, 8 << i, 16 << i, 255, 1);
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do_test (0, 0, 8 << i, 16 << i, 255, -1);
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do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 0);
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do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 1);
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do_test (2 * i, i, 8 << i, 16 << i, 255, 0);
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do_test (2 * i, i, 8 << i, 16 << i, 255, 1);
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}
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do_test_limit (0, 0, 0, 0, 127, 0);
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do_test_limit (4, 0, 21, 20, 127, 0);
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do_test_limit (0, 4, 21, 20, 127, 0);
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do_test_limit (8, 0, 25, 24, 127, 0);
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do_test_limit (0, 8, 25, 24, 127, 0);
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for (i = 0; i < 8; ++i)
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{
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do_test_limit (0, 0, 17 - i, 16 - i, 127, 0);
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do_test_limit (0, 0, 17 - i, 16 - i, 255, 0);
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do_test_limit (0, 0, 15 - i, 16 - i, 127, 0);
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do_test_limit (0, 0, 15 - i, 16 - i, 127, 1);
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do_test_limit (0, 0, 15 - i, 16 - i, 127, -1);
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do_test_limit (0, 0, 15 - i, 16 - i, 255, 0);
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do_test_limit (0, 0, 15 - i, 16 - i, 255, 1);
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do_test_limit (0, 0, 15 - i, 16 - i, 255, -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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