From 0b09d1e5ed195662e8df3246ca4cc450947cc0f8 Mon Sep 17 00:00:00 2001 From: "Peter S. Mazinger" Date: Fri, 11 Nov 2005 22:41:52 +0000 Subject: Split up string.c, make internals hidden --- libc/string/i386/strcmp.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 libc/string/i386/strcmp.c (limited to 'libc/string/i386/strcmp.c') diff --git a/libc/string/i386/strcmp.c b/libc/string/i386/strcmp.c new file mode 100644 index 000000000..4744fdf4e --- /dev/null +++ b/libc/string/i386/strcmp.c @@ -0,0 +1,61 @@ +/* + * This string-include defines all string functions as inline + * functions. Use gcc. It also assumes ds=es=data space, this should be + * normal. Most of the string-functions are rather heavily hand-optimized, + * see especially strtok,strstr,str[c]spn. They should work, but are not + * very easy to understand. Everything is done entirely within the register + * set, making the functions fast and clean. String instructions have been + * used through-out, making for "slightly" unclear code :-) + * + * NO Copyright (C) 1991, 1992 Linus Torvalds, + * consider these trivial functions to be PD. + */ + +/* + * Copyright (C) 2000-2005 Erik Andersen + * + * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. + */ + +/* + * Modified for uClibc by Erik Andersen + * These make no attempt to use nifty things like mmx/3dnow/etc. + * These are not inline, and will therefore not be as fast as + * modifying the headers to use inlines (and cannot therefore + * do tricky things when dealing with const memory). But they + * should (I hope!) be faster than their generic equivalents.... + * + * More importantly, these should provide a good example for + * others to follow when adding arch specific optimizations. + * -Erik + */ + +#define _GNU_SOURCE +#include +#include /* for __LOCALE_C_ONLY */ + +int attribute_hidden __strcmp(const char *cs, const char *ct) +{ + int d0, d1; + register int __res; + __asm__ __volatile__( + "1:\tlodsb\n\t" + "scasb\n\t" + "jne 2f\n\t" + "testb %%al,%%al\n\t" + "jne 1b\n\t" + "xorl %%eax,%%eax\n\t" + "jmp 3f\n" + "2:\tsbbl %%eax,%%eax\n\t" + "orb $1,%%al\n" + "3:" + :"=a" (__res), "=&S" (d0), "=&D" (d1) + :"1" (cs),"2" (ct)); + return __res; +} + +strong_alias(__strcmp, strcmp) + +#ifdef __LOCALE_C_ONLY +weak_alias(strcmp, strcoll) +#endif /* __LOCALE_C_ONLY */ -- cgit v1.2.3