1 /*
2 * This string-include defines all string functions as inline
3 * functions. Use gcc. It also assumes ds=es=data space, this should be
4 * normal. Most of the string-functions are rather heavily hand-optimized,
5 * see especially strtok,strstr,str[c]spn. They should work, but are not
6 * very easy to understand. Everything is done entirely within the register
7 * set, making the functions fast and clean. String instructions have been
8 * used through-out, making for "slightly" unclear code :-)
9 *
10 * NO Copyright (C) 1991, 1992 Linus Torvalds,
11 * consider these trivial functions to be PD.
12 */
13
14 /*
15 * Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
16 *
17 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
18 */
19
20 /*
21 * Modified for uClibc by Erik Andersen <andersen@codepoet.org>
22 * These make no attempt to use nifty things like mmx/3dnow/etc.
23 * These are not inline, and will therefore not be as fast as
24 * modifying the headers to use inlines (and cannot therefore
25 * do tricky things when dealing with const memory). But they
26 * should (I hope!) be faster than their generic equivalents....
27 *
28 * More importantly, these should provide a good example for
29 * others to follow when adding arch specific optimizations.
30 * -Erik
31 */
32
33 #include <string.h>
34
strcmp(const char * cs,const char * ct)35 int strcmp(const char *cs, const char *ct)
36 {
37 int d0, d1;
38 register int __res;
39 __asm__ __volatile__(
40 "1:\tlodsb\n\t"
41 "scasb\n\t"
42 "jne 2f\n\t"
43 "testb %%al,%%al\n\t"
44 "jne 1b\n\t"
45 "xorl %%eax,%%eax\n\t"
46 "jmp 3f\n"
47 "2:\tsbbl %%eax,%%eax\n\t"
48 "orb $1,%%al\n"
49 "3:"
50 :"=a" (__res), "=&S" (d0), "=&D" (d1)
51 :"1" (cs),"2" (ct));
52 return __res;
53 }
54 libc_hidden_def(strcmp)
55
56 #ifndef __UCLIBC_HAS_LOCALE__
57 strong_alias(strcmp,strcoll)
58 libc_hidden_def(strcoll)
59 #endif
60