@*****************************************************************************
 @ deinterleave_chroma.S : ARM NEONv1 conversion of interleaved to planar chroma
 @*****************************************************************************
 @ Copyright (C) 2009-2011 Rémi Denis-Courmont
 @ Copyright (C) 2013 Martin Storsjö
 @
 @ This program 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 2.1 of the License, or
 @ (at your option) any later version.
 @
 @ This program 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 program; if not, write to the Free Software Foundation,
 @ Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 @****************************************************************************/

	.syntax unified
	.fpu neon
	.text

#define UV	r0
#define COUNT	r1
#define WIDTH	r2
#define HEIGHT	r3
#define IPITCH	r4
#define IPAD	r4
#define U	r5
#define V	r6
#define OPITCH	lr
#define OPAD	lr

	.align 2
	.global deinterleave_chroma_neon
	.type	deinterleave_chroma_neon, %function
deinterleave_chroma_neon:
	push		{r4-r6,lr}
	ldmia		r0,	{U, V, OPITCH}
	ldmia		r1,	{UV, IPITCH}
	cmp		HEIGHT,	#0

	@ round the width up to a multiple of 8
	add		WIDTH,	WIDTH, #7
	bic		WIDTH,	WIDTH, #7

	sub		IPAD,	IPITCH,	WIDTH, lsl #1
	sub		OPAD,	OPITCH,	WIDTH
1:
	movsgt		COUNT,	WIDTH
	pople		{r4-r6,pc}
2:
	pld		[UV, #64]
	vld2.u8		{d0, d1},	[UV,:128]!
	subs		COUNT,	COUNT,	#8
	vst1.u8		{d0},		[U,:64]!
	vst1.u8		{d1},		[V,:64]!
	bgt		2b

	subs		HEIGHT,	#1
	add		UV,	UV,	IPAD
	add		U,	U,	OPAD
	add		V,	V,	OPAD
	b		1b