/* * 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 <andersen@uclibc.org> * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ /* * Modified for uClibc by Erik Andersen <andersen@codepoet.org> * 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 */ #include <string.h> libc_hidden_proto(memmove) void *memmove(void *dest, const void *src, size_t n) { int d0, d1, d2; if (dest<src) __asm__ __volatile__( "rep\n\t" "movsb" : "=&c" (d0), "=&S" (d1), "=&D" (d2) :"0" (n),"1" (src),"2" (dest) : "memory"); else __asm__ __volatile__( "std\n\t" "rep\n\t" "movsb\n\t" "cld" : "=&c" (d0), "=&S" (d1), "=&D" (d2) :"0" (n), "1" (n-1+(const char *)src), "2" (n-1+(char *)dest) :"memory"); return dest; } libc_hidden_def(memmove)