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/*
* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
* Copyright (C) 2004 Microtronix Datacom Ltd
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/types.h>
#include <linux/string.h>
void *memmove(void *d, const void *s, size_t count)
{
unsigned long dst, src;
if (!count)
return d;
if (d < s) {
dst = (unsigned long) d;
src = (unsigned long) s;
if ((count < 8) || ((dst ^ src) & 3))
goto restup;
if (dst & 1) {
*(char *)dst++ = *(char *)src++;
count--;
}
if (dst & 2) {
*(short *)dst = *(short *)src;
src += 2;
dst += 2;
count -= 2;
}
while (count > 3) {
*(long *)dst = *(long *)src;
src += 4;
dst += 4;
count -= 4;
}
restup:
while (count--)
*(char *)dst++ = *(char *)src++;
} else {
dst = (unsigned long) d + count;
src = (unsigned long) s + count;
if ((count < 8) || ((dst ^ src) & 3))
goto restdown;
if (dst & 1) {
src--;
dst--;
count--;
*(char *)dst = *(char *)src;
}
if (dst & 2) {
src -= 2;
dst -= 2;
count -= 2;
*(short *)dst = *(short *)src;
}
while (count > 3) {
src -= 4;
dst -= 4;
count -= 4;
*(long *)dst = *(long *)src;
}
restdown:
while (count--) {
src--;
dst--;
*(char *)dst = *(char *)src;
}
}
return d;
}
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