/*
 * String handling functions for PowerPC.
 *
 * Copyright (C) 1996 Paul Mackerras.
 *
 *
 * In a mail from Paul on 23.10.2006 05:47:
 *
 * You may put an LGPL permission statement on that code, replacing the
 * GPL permission statement.  From a technical point of view, I'm not
 * sure that the code in ppcasm_memcpy_cachable.S is the best thing to
 * use in userspace, though; for one thing, it has a cache line size
 * assumption encoded into it.  Why don't you just use the glibc memcpy?
 * It's pretty well optimized these days, AFAIK.
 * 
 * Paul.
 *
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "ppc_asm.h"

	.globl	direct_ppcasm_memcpy
direct_ppcasm_memcpy:
	srwi.	r7,r5,3
	addi	r6,r3,-4
	addi	r4,r4,-4
	beq	2f			/* if less than 8 bytes to do */
	andi.	r0,r6,3			/* get dest word aligned */
	mtctr	r7
	bne	5f
1:	lwz	r7,4(r4)
	lwzu	r8,8(r4)
	stw	r7,4(r6)
	stwu	r8,8(r6)
	bdnz	1b
	andi.	r5,r5,7
2:	cmplwi	0,r5,4
	blt	3f
	lwzu	r0,4(r4)
	addi	r5,r5,-4
	stwu	r0,4(r6)
3:	cmpwi	0,r5,0
	beqlr
	mtctr	r5
	addi	r4,r4,3
	addi	r6,r6,3
4:	lbzu	r0,1(r4)
	stbu	r0,1(r6)
	bdnz	4b
	blr
5:	subfic	r0,r0,4
	mtctr	r0
6:	lbz	r7,4(r4)
	addi	r4,r4,1
	stb	r7,4(r6)
	addi	r6,r6,1
	bdnz	6b
	subf	r5,r0,r5
	rlwinm.	r7,r5,32-3,3,31
	beq	2b
	mtctr	r7
	b	1b