/* Measure strcmp and wcscmp functions. Copyright (C) 2013-2015 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/>. */ #define TEST_MAIN #ifdef WIDE # define TEST_NAME "wcscmp" #else # define TEST_NAME "strcmp" #endif #include "bench-string.h" #ifdef WIDE # include <wchar.h> # define L(str) L##str # define STRCMP wcscmp # define STRCPY wcscpy # define STRLEN wcslen # define MEMCPY wmemcpy # define SIMPLE_STRCMP simple_wcscmp # define STUPID_STRCMP stupid_wcscmp # define CHAR wchar_t # define UCHAR wchar_t # define CHARBYTES 4 # define CHARBYTESLOG 2 # define CHARALIGN __alignof__ (CHAR) # define MIDCHAR 0x7fffffff # define LARGECHAR 0xfffffffe # define CHAR__MAX WCHAR_MAX # define CHAR__MIN WCHAR_MIN /* Wcscmp uses signed semantics for comparison, not unsigned */ /* Avoid using substraction since possible overflow */ int simple_wcscmp (const wchar_t *s1, const wchar_t *s2) { wchar_t c1, c2; do { c1 = *s1++; c2 = *s2++; if (c2 == L'\0') return c1 - c2; } while (c1 == c2); return c1 < c2 ? -1 : 1; } int stupid_wcscmp (const wchar_t *s1, const wchar_t *s2) { size_t ns1 = wcslen (s1) + 1; size_t ns2 = wcslen (s2) + 1; size_t n = ns1 < ns2 ? ns1 : ns2; int ret = 0; wchar_t c1, c2; while (n--) { c1 = *s1++; c2 = *s2++; if ((ret = c1 < c2 ? -1 : c1 == c2 ? 0 : 1) != 0) break; } return ret; } #else # include <limits.h> # define L(str) str # define STRCMP strcmp # define STRCPY strcpy # define STRLEN strlen # define MEMCPY memcpy # define SIMPLE_STRCMP simple_strcmp # define STUPID_STRCMP stupid_strcmp # define CHAR char # define UCHAR unsigned char # define CHARBYTES 1 # define CHARBYTESLOG 0 # define CHARALIGN 1 # define MIDCHAR 0x7f # define LARGECHAR 0xfe # define CHAR__MAX CHAR_MAX # define CHAR__MIN CHAR_MIN /* Strcmp uses unsigned semantics for comparison. */ int simple_strcmp (const char *s1, const char *s2) { int ret; while ((ret = *(unsigned char *) s1 - *(unsigned char*) s2++) == 0 && *s1++); return ret; } int stupid_strcmp (const char *s1, const char *s2) { size_t ns1 = strlen (s1) + 1; size_t ns2 = strlen (s2) + 1; size_t n = ns1 < ns2 ? ns1 : ns2; int ret = 0; while (n--) if ((ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) != 0) break; return ret; } #endif typedef int (*proto_t) (const CHAR *, const CHAR *); IMPL (STUPID_STRCMP, 1) IMPL (SIMPLE_STRCMP, 1) IMPL (STRCMP, 1) static void do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, int exp_result) { size_t i, iters = INNER_LOOP_ITERS; timing_t start, stop, cur; TIMING_NOW (start); for (i = 0; i < iters; ++i) { CALL (impl, s1, s2); } TIMING_NOW (stop); TIMING_DIFF (cur, start, stop); TIMING_PRINT_MEAN ((double) cur, (double) iters); } static void do_test (size_t align1, size_t align2, size_t len, int max_char, int exp_result) { size_t i; CHAR *s1, *s2; if (len == 0) return; align1 &= 63; if (align1 + (len + 1) * CHARBYTES >= page_size) return; align2 &= 63; if (align2 + (len + 1) * CHARBYTES >= page_size) return; /* Put them close to the end of page. */ i = align1 + CHARBYTES * (len + 2); s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1); i = align2 + CHARBYTES * (len + 2); s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16) + align2); for (i = 0; i < len; i++) s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; s1[len] = s2[len] = 0; s1[len + 1] = 23; s2[len + 1] = 24 + exp_result; s2[len - 1] -= exp_result; printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2); FOR_EACH_IMPL (impl, 0) do_one_test (impl, s1, s2, exp_result); 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 = 1; i < 32; ++i) { do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0); do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1); do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1); } for (i = 1; i < 10 + CHARBYTESLOG; ++i) { do_test (0, 0, 2 << i, MIDCHAR, 0); do_test (0, 0, 2 << i, LARGECHAR, 0); do_test (0, 0, 2 << i, MIDCHAR, 1); do_test (0, 0, 2 << i, LARGECHAR, 1); do_test (0, 0, 2 << i, MIDCHAR, -1); do_test (0, 0, 2 << i, LARGECHAR, -1); do_test (0, CHARBYTES * i, 2 << i, MIDCHAR, 1); do_test (CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, LARGECHAR, 1); } for (i = 1; i < 8; ++i) { do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 0); do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 0); do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 1); do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 1); do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, -1); do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1); } return ret; } #include "../test-skeleton.c"