83 lines
1.4 KiB
C
83 lines
1.4 KiB
C
/*
|
|
* 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>
|
|
|
|
#ifdef __HAVE_ARCH_MEMMOVE
|
|
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;
|
|
}
|
|
#endif /* __HAVE_ARCH_MEMMOVE */
|