;
; jdmrgss2-64.asm - merged upsampling/color conversion (64-bit SSE2)
;
; Copyright 2009, 2012 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright 2009, 2012 D. R. Commander
;
; Based on
; x86 SIMD extension for IJG JPEG library
; Copyright (C) 1999-2006, MIYASAKA Masaru.
; For conditions of distribution and use, see copyright notice in jsimdext.inc
;
; This file should be assembled with NASM (Netwide Assembler),
; can *not* be assembled with Microsoft's MASM or any compatible
; assembler (including Borland's Turbo Assembler).
; NASM is available from http://nasm.sourceforge.net/ or
; http://sourceforge.net/project/showfiles.php?group_id=6208
;
; [TAB8]

%include "jcolsamp.inc"
				
; --------------------------------------------------------------------------
;
; Upsample and color convert for the case of 2:1 horizontal and 1:1 vertical.
;
; GLOBAL(void)
; jsimd_h2v1_merged_upsample_sse2 (JDIMENSION output_width,
;                                  JSAMPIMAGE input_buf,
;                                  JDIMENSION in_row_group_ctr,
;                                  JSAMPARRAY output_buf);
;

; r10 = JDIMENSION output_width
; r11 = JSAMPIMAGE input_buf
; r12 = JDIMENSION in_row_group_ctr
; r13 = JSAMPARRAY output_buf

%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
%define WK_NUM		3

	align	16
	global	EXTN(jsimd_h2v1_merged_upsample_sse2)

EXTN(jsimd_h2v1_merged_upsample_sse2):
	push	rbp
	mov	rax,rsp				; rax = original rbp
	sub	rsp, byte 4
	and	rsp, byte (-SIZEOF_XMMWORD)	; align to 128 bits
	mov	[rsp],rax
	mov	rbp,rsp				; rbp = aligned rbp
	lea	rsp, [wk(0)]
	collect_args
	push	rbx

	mov	rcx, r10	; col
	test	rcx,rcx
	jz	near .return

	push	rcx

	mov	rdi, r11
	mov	rcx, r12
	mov	rsi, JSAMPARRAY [rdi+0*SIZEOF_JSAMPARRAY]
	mov	rbx, JSAMPARRAY [rdi+1*SIZEOF_JSAMPARRAY]
	mov	rdx, JSAMPARRAY [rdi+2*SIZEOF_JSAMPARRAY]
	mov	rdi, r13
	mov	rsi, JSAMPROW [rsi+rcx*SIZEOF_JSAMPROW]		; inptr0
	mov	rbx, JSAMPROW [rbx+rcx*SIZEOF_JSAMPROW]		; inptr1
	mov	rdx, JSAMPROW [rdx+rcx*SIZEOF_JSAMPROW]		; inptr2
	mov	rdi, JSAMPROW [rdi]				; outptr

	pop	rcx			; col

.columnloop:

	movdqa    xmm6, XMMWORD [rbx]	; xmm6=Cb(0123456789ABCDEF)
	movdqa    xmm7, XMMWORD [rdx]	; xmm7=Cr(0123456789ABCDEF)

	pxor      xmm1,xmm1		; xmm1=(all 0's)
	pcmpeqw   xmm3,xmm3
	psllw     xmm3,7		; xmm3={0xFF80 0xFF80 0xFF80 0xFF80 ..}

	movdqa    xmm4,xmm6
	punpckhbw xmm6,xmm1		; xmm6=Cb(89ABCDEF)=CbH
	punpcklbw xmm4,xmm1		; xmm4=Cb(01234567)=CbL
	movdqa    xmm0,xmm7
	punpckhbw xmm7,xmm1		; xmm7=Cr(89ABCDEF)=CrH
	punpcklbw xmm0,xmm1		; xmm0=Cr(01234567)=CrL

	paddw     xmm6,xmm3
	paddw     xmm4,xmm3
	paddw     xmm7,xmm3
	paddw     xmm0,xmm3

	; (Original)
	; R = Y                + 1.40200 * Cr
	; G = Y - 0.34414 * Cb - 0.71414 * Cr
	; B = Y + 1.77200 * Cb
	;
	; (This implementation)
	; R = Y                + 0.40200 * Cr + Cr
	; G = Y - 0.34414 * Cb + 0.28586 * Cr - Cr
	; B = Y - 0.22800 * Cb + Cb + Cb

	movdqa	xmm5,xmm6		; xmm5=CbH
	movdqa	xmm2,xmm4		; xmm2=CbL
	paddw	xmm6,xmm6		; xmm6=2*CbH
	paddw	xmm4,xmm4		; xmm4=2*CbL
	movdqa	xmm1,xmm7		; xmm1=CrH
	movdqa	xmm3,xmm0		; xmm3=CrL
	paddw	xmm7,xmm7		; xmm7=2*CrH
	paddw	xmm0,xmm0		; xmm0=2*CrL

	pmulhw	xmm6,[rel PW_MF0228]	; xmm6=(2*CbH * -FIX(0.22800))
	pmulhw	xmm4,[rel PW_MF0228]	; xmm4=(2*CbL * -FIX(0.22800))
	pmulhw	xmm7,[rel PW_F0402]	; xmm7=(2*CrH * FIX(0.40200))
	pmulhw	xmm0,[rel PW_F0402]	; xmm0=(2*CrL * FIX(0.40200))

	paddw	xmm6,[rel PW_ONE]
	paddw	xmm4,[rel PW_ONE]
	psraw	xmm6,1			; xmm6=(CbH * -FIX(0.22800))
	psraw	xmm4,1			; xmm4=(CbL * -FIX(0.22800))
	paddw	xmm7,[rel PW_ONE]
	paddw	xmm0,[rel PW_ONE]
	psraw	xmm7,1			; xmm7=(CrH * FIX(0.40200))
	psraw	xmm0,1			; xmm0=(CrL * FIX(0.40200))

	paddw	xmm6,xmm5
	paddw	xmm4,xmm2
	paddw	xmm6,xmm5		; xmm6=(CbH * FIX(1.77200))=(B-Y)H
	paddw	xmm4,xmm2		; xmm4=(CbL * FIX(1.77200))=(B-Y)L
	paddw	xmm7,xmm1		; xmm7=(CrH * FIX(1.40200))=(R-Y)H
	paddw	xmm0,xmm3		; xmm0=(CrL * FIX(1.40200))=(R-Y)L

	movdqa	XMMWORD [wk(0)], xmm6	; wk(0)=(B-Y)H
	movdqa	XMMWORD [wk(1)], xmm7	; wk(1)=(R-Y)H

	movdqa    xmm6,xmm5
	movdqa    xmm7,xmm2
	punpcklwd xmm5,xmm1
	punpckhwd xmm6,xmm1
	pmaddwd   xmm5,[rel PW_MF0344_F0285]
	pmaddwd   xmm6,[rel PW_MF0344_F0285]
	punpcklwd xmm2,xmm3
	punpckhwd xmm7,xmm3
	pmaddwd   xmm2,[rel PW_MF0344_F0285]
	pmaddwd   xmm7,[rel PW_MF0344_F0285]

	paddd     xmm5,[rel PD_ONEHALF]
	paddd     xmm6,[rel PD_ONEHALF]
	psrad     xmm5,SCALEBITS
	psrad     xmm6,SCALEBITS
	paddd     xmm2,[rel PD_ONEHALF]
	paddd     xmm7,[rel PD_ONEHALF]
	psrad     xmm2,SCALEBITS
	psrad     xmm7,SCALEBITS

	packssdw  xmm5,xmm6	; xmm5=CbH*-FIX(0.344)+CrH*FIX(0.285)
	packssdw  xmm2,xmm7	; xmm2=CbL*-FIX(0.344)+CrL*FIX(0.285)
	psubw     xmm5,xmm1	; xmm5=CbH*-FIX(0.344)+CrH*-FIX(0.714)=(G-Y)H
	psubw     xmm2,xmm3	; xmm2=CbL*-FIX(0.344)+CrL*-FIX(0.714)=(G-Y)L

	movdqa	XMMWORD [wk(2)], xmm5	; wk(2)=(G-Y)H

	mov	al,2			; Yctr
	jmp	short .Yloop_1st

.Yloop_2nd:
	movdqa	xmm0, XMMWORD [wk(1)]	; xmm0=(R-Y)H
	movdqa	xmm2, XMMWORD [wk(2)]	; xmm2=(G-Y)H
	movdqa	xmm4, XMMWORD [wk(0)]	; xmm4=(B-Y)H

.Yloop_1st:
	movdqa	xmm7, XMMWORD [rsi]	; xmm7=Y(0123456789ABCDEF)

	pcmpeqw	xmm6,xmm6
	psrlw	xmm6,BYTE_BIT		; xmm6={0xFF 0x00 0xFF 0x00 ..}
	pand	xmm6,xmm7		; xmm6=Y(02468ACE)=YE
	psrlw	xmm7,BYTE_BIT		; xmm7=Y(13579BDF)=YO

	movdqa	xmm1,xmm0		; xmm1=xmm0=(R-Y)(L/H)
	movdqa	xmm3,xmm2		; xmm3=xmm2=(G-Y)(L/H)
	movdqa	xmm5,xmm4		; xmm5=xmm4=(B-Y)(L/H)

	paddw     xmm0,xmm6		; xmm0=((R-Y)+YE)=RE=R(02468ACE)
	paddw     xmm1,xmm7		; xmm1=((R-Y)+YO)=RO=R(13579BDF)
	packuswb  xmm0,xmm0		; xmm0=R(02468ACE********)
	packuswb  xmm1,xmm1		; xmm1=R(13579BDF********)

	paddw     xmm2,xmm6		; xmm2=((G-Y)+YE)=GE=G(02468ACE)
	paddw     xmm3,xmm7		; xmm3=((G-Y)+YO)=GO=G(13579BDF)
	packuswb  xmm2,xmm2		; xmm2=G(02468ACE********)
	packuswb  xmm3,xmm3		; xmm3=G(13579BDF********)

	paddw     xmm4,xmm6		; xmm4=((B-Y)+YE)=BE=B(02468ACE)
	paddw     xmm5,xmm7		; xmm5=((B-Y)+YO)=BO=B(13579BDF)
	packuswb  xmm4,xmm4		; xmm4=B(02468ACE********)
	packuswb  xmm5,xmm5		; xmm5=B(13579BDF********)

%if RGB_PIXELSIZE == 3 ; ---------------

	; xmmA=(00 02 04 06 08 0A 0C 0E **), xmmB=(01 03 05 07 09 0B 0D 0F **)
	; xmmC=(10 12 14 16 18 1A 1C 1E **), xmmD=(11 13 15 17 19 1B 1D 1F **)
	; xmmE=(20 22 24 26 28 2A 2C 2E **), xmmF=(21 23 25 27 29 2B 2D 2F **)
	; xmmG=(** ** ** ** ** ** ** ** **), xmmH=(** ** ** ** ** ** ** ** **)

	punpcklbw xmmA,xmmC	; xmmA=(00 10 02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E)
	punpcklbw xmmE,xmmB	; xmmE=(20 01 22 03 24 05 26 07 28 09 2A 0B 2C 0D 2E 0F)
	punpcklbw xmmD,xmmF	; xmmD=(11 21 13 23 15 25 17 27 19 29 1B 2B 1D 2D 1F 2F)

	movdqa    xmmG,xmmA
	movdqa    xmmH,xmmA
	punpcklwd xmmA,xmmE	; xmmA=(00 10 20 01 02 12 22 03 04 14 24 05 06 16 26 07)
	punpckhwd xmmG,xmmE	; xmmG=(08 18 28 09 0A 1A 2A 0B 0C 1C 2C 0D 0E 1E 2E 0F)

	psrldq    xmmH,2	; xmmH=(02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E -- --)
	psrldq    xmmE,2	; xmmE=(22 03 24 05 26 07 28 09 2A 0B 2C 0D 2E 0F -- --)

	movdqa    xmmC,xmmD
	movdqa    xmmB,xmmD
	punpcklwd xmmD,xmmH	; xmmD=(11 21 02 12 13 23 04 14 15 25 06 16 17 27 08 18)
	punpckhwd xmmC,xmmH	; xmmC=(19 29 0A 1A 1B 2B 0C 1C 1D 2D 0E 1E 1F 2F -- --)

	psrldq    xmmB,2	; xmmB=(13 23 15 25 17 27 19 29 1B 2B 1D 2D 1F 2F -- --)

	movdqa    xmmF,xmmE
	punpcklwd xmmE,xmmB	; xmmE=(22 03 13 23 24 05 15 25 26 07 17 27 28 09 19 29)
	punpckhwd xmmF,xmmB	; xmmF=(2A 0B 1B 2B 2C 0D 1D 2D 2E 0F 1F 2F -- -- -- --)

	pshufd    xmmH,xmmA,0x4E; xmmH=(04 14 24 05 06 16 26 07 00 10 20 01 02 12 22 03)
	movdqa    xmmB,xmmE
	punpckldq xmmA,xmmD	; xmmA=(00 10 20 01 11 21 02 12 02 12 22 03 13 23 04 14)
	punpckldq xmmE,xmmH	; xmmE=(22 03 13 23 04 14 24 05 24 05 15 25 06 16 26 07)
	punpckhdq xmmD,xmmB	; xmmD=(15 25 06 16 26 07 17 27 17 27 08 18 28 09 19 29)

	pshufd    xmmH,xmmG,0x4E; xmmH=(0C 1C 2C 0D 0E 1E 2E 0F 08 18 28 09 0A 1A 2A 0B)
	movdqa    xmmB,xmmF
	punpckldq xmmG,xmmC	; xmmG=(08 18 28 09 19 29 0A 1A 0A 1A 2A 0B 1B 2B 0C 1C)
	punpckldq xmmF,xmmH	; xmmF=(2A 0B 1B 2B 0C 1C 2C 0D 2C 0D 1D 2D 0E 1E 2E 0F)
	punpckhdq xmmC,xmmB	; xmmC=(1D 2D 0E 1E 2E 0F 1F 2F 1F 2F -- -- -- -- -- --)

	punpcklqdq xmmA,xmmE	; xmmA=(00 10 20 01 11 21 02 12 22 03 13 23 04 14 24 05)
	punpcklqdq xmmD,xmmG	; xmmD=(15 25 06 16 26 07 17 27 08 18 28 09 19 29 0A 1A)
	punpcklqdq xmmF,xmmC	; xmmF=(2A 0B 1B 2B 0C 1C 2C 0D 1D 2D 0E 1E 2E 0F 1F 2F)

	cmp	rcx, byte SIZEOF_XMMWORD
	jb	short .column_st32

	test	rdi, SIZEOF_XMMWORD-1
	jnz	short .out1
	; --(aligned)-------------------
	movntdq	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
	movntdq	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
	movntdq	XMMWORD [rdi+2*SIZEOF_XMMWORD], xmmF
	jmp	short .out0
.out1:	; --(unaligned)-----------------
	movdqu	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
	movdqu	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
	movdqu	XMMWORD [rdi+2*SIZEOF_XMMWORD], xmmF
.out0:
	add	rdi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD	; outptr
	sub	rcx, byte SIZEOF_XMMWORD
	jz	near .endcolumn

	add	rsi, byte SIZEOF_XMMWORD	; inptr0
	dec	al			; Yctr
	jnz	near .Yloop_2nd

	add	rbx, byte SIZEOF_XMMWORD	; inptr1
	add	rdx, byte SIZEOF_XMMWORD	; inptr2
	jmp	near .columnloop

.column_st32:
	lea	rcx, [rcx+rcx*2]		; imul ecx, RGB_PIXELSIZE
	cmp	rcx, byte 2*SIZEOF_XMMWORD
	jb	short .column_st16
	movdqu	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
	movdqu	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
	add	rdi, byte 2*SIZEOF_XMMWORD	; outptr
	movdqa	xmmA,xmmF
	sub	rcx, byte 2*SIZEOF_XMMWORD
	jmp	short .column_st15
.column_st16:
	cmp	rcx, byte SIZEOF_XMMWORD
	jb	short .column_st15
	movdqu	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
	add	rdi, byte SIZEOF_XMMWORD	; outptr
	movdqa	xmmA,xmmD
	sub	rcx, byte SIZEOF_XMMWORD
.column_st15:
	; Store the lower 8 bytes of xmmA to the output when it has enough
	; space.
	cmp	rcx, byte SIZEOF_MMWORD
	jb	short .column_st7
	movq	XMM_MMWORD [rdi], xmmA
	add	rdi, byte SIZEOF_MMWORD
	sub	rcx, byte SIZEOF_MMWORD
	psrldq	xmmA, SIZEOF_MMWORD
.column_st7:
	; Store the lower 4 bytes of xmmA to the output when it has enough
	; space.
	cmp	rcx, byte SIZEOF_DWORD
	jb	short .column_st3
	movd	XMM_DWORD [rdi], xmmA
	add	rdi, byte SIZEOF_DWORD
	sub	rcx, byte SIZEOF_DWORD
	psrldq	xmmA, SIZEOF_DWORD
.column_st3:
	; Store the lower 2 bytes of rax to the output when it has enough
	; space.
	movd	eax, xmmA
	cmp	rcx, byte SIZEOF_WORD
	jb	short .column_st1
	mov	WORD [rdi], ax
	add	rdi, byte SIZEOF_WORD
	sub	rcx, byte SIZEOF_WORD
	shr	rax, 16
.column_st1:
	; Store the lower 1 byte of rax to the output when it has enough
	; space.
	test	rcx, rcx
	jz	short .endcolumn
	mov	BYTE [rdi], al

%else ; RGB_PIXELSIZE == 4 ; -----------

%ifdef RGBX_FILLER_0XFF
	pcmpeqb   xmm6,xmm6		; xmm6=XE=X(02468ACE********)
	pcmpeqb   xmm7,xmm7		; xmm7=XO=X(13579BDF********)
%else
	pxor      xmm6,xmm6		; xmm6=XE=X(02468ACE********)
	pxor      xmm7,xmm7		; xmm7=XO=X(13579BDF********)
%endif
	; xmmA=(00 02 04 06 08 0A 0C 0E **), xmmB=(01 03 05 07 09 0B 0D 0F **)
	; xmmC=(10 12 14 16 18 1A 1C 1E **), xmmD=(11 13 15 17 19 1B 1D 1F **)
	; xmmE=(20 22 24 26 28 2A 2C 2E **), xmmF=(21 23 25 27 29 2B 2D 2F **)
	; xmmG=(30 32 34 36 38 3A 3C 3E **), xmmH=(31 33 35 37 39 3B 3D 3F **)

	punpcklbw xmmA,xmmC	; xmmA=(00 10 02 12 04 14 06 16 08 18 0A 1A 0C 1C 0E 1E)
	punpcklbw xmmE,xmmG	; xmmE=(20 30 22 32 24 34 26 36 28 38 2A 3A 2C 3C 2E 3E)
	punpcklbw xmmB,xmmD	; xmmB=(01 11 03 13 05 15 07 17 09 19 0B 1B 0D 1D 0F 1F)
	punpcklbw xmmF,xmmH	; xmmF=(21 31 23 33 25 35 27 37 29 39 2B 3B 2D 3D 2F 3F)

	movdqa    xmmC,xmmA
	punpcklwd xmmA,xmmE	; xmmA=(00 10 20 30 02 12 22 32 04 14 24 34 06 16 26 36)
	punpckhwd xmmC,xmmE	; xmmC=(08 18 28 38 0A 1A 2A 3A 0C 1C 2C 3C 0E 1E 2E 3E)
	movdqa    xmmG,xmmB
	punpcklwd xmmB,xmmF	; xmmB=(01 11 21 31 03 13 23 33 05 15 25 35 07 17 27 37)
	punpckhwd xmmG,xmmF	; xmmG=(09 19 29 39 0B 1B 2B 3B 0D 1D 2D 3D 0F 1F 2F 3F)

	movdqa    xmmD,xmmA
	punpckldq xmmA,xmmB	; xmmA=(00 10 20 30 01 11 21 31 02 12 22 32 03 13 23 33)
	punpckhdq xmmD,xmmB	; xmmD=(04 14 24 34 05 15 25 35 06 16 26 36 07 17 27 37)
	movdqa    xmmH,xmmC
	punpckldq xmmC,xmmG	; xmmC=(08 18 28 38 09 19 29 39 0A 1A 2A 3A 0B 1B 2B 3B)
	punpckhdq xmmH,xmmG	; xmmH=(0C 1C 2C 3C 0D 1D 2D 3D 0E 1E 2E 3E 0F 1F 2F 3F)

	cmp	rcx, byte SIZEOF_XMMWORD
	jb	short .column_st32

	test	rdi, SIZEOF_XMMWORD-1
	jnz	short .out1
	; --(aligned)-------------------
	movntdq	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
	movntdq	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
	movntdq	XMMWORD [rdi+2*SIZEOF_XMMWORD], xmmC
	movntdq	XMMWORD [rdi+3*SIZEOF_XMMWORD], xmmH
	jmp	short .out0
.out1:	; --(unaligned)-----------------
	movdqu	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
	movdqu	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
	movdqu	XMMWORD [rdi+2*SIZEOF_XMMWORD], xmmC
	movdqu	XMMWORD [rdi+3*SIZEOF_XMMWORD], xmmH
.out0:
	add	rdi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD	; outptr
	sub	rcx, byte SIZEOF_XMMWORD
	jz	near .endcolumn

	add	rsi, byte SIZEOF_XMMWORD	; inptr0
	dec	al			; Yctr
	jnz	near .Yloop_2nd

	add	rbx, byte SIZEOF_XMMWORD	; inptr1
	add	rdx, byte SIZEOF_XMMWORD	; inptr2
	jmp	near .columnloop

.column_st32:
	cmp	rcx, byte SIZEOF_XMMWORD/2
	jb	short .column_st16
	movdqu	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
	movdqu	XMMWORD [rdi+1*SIZEOF_XMMWORD], xmmD
	add	rdi, byte 2*SIZEOF_XMMWORD	; outptr
	movdqa	xmmA,xmmC
	movdqa	xmmD,xmmH
	sub	rcx, byte SIZEOF_XMMWORD/2
.column_st16:
	cmp	rcx, byte SIZEOF_XMMWORD/4
	jb	short .column_st15
	movdqu	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmmA
	add	rdi, byte SIZEOF_XMMWORD	; outptr
	movdqa	xmmA,xmmD
	sub	rcx, byte SIZEOF_XMMWORD/4
.column_st15:
	; Store two pixels (8 bytes) of xmmA to the output when it has enough
	; space.
	cmp	rcx, byte SIZEOF_XMMWORD/8
	jb	short .column_st7
	movq	XMM_MMWORD [rdi], xmmA
	add	rdi, byte SIZEOF_XMMWORD/8*4
	sub	rcx, byte SIZEOF_XMMWORD/8
	psrldq	xmmA, SIZEOF_XMMWORD/8*4
.column_st7:
	; Store one pixel (4 bytes) of xmmA to the output when it has enough
	; space.
	test	rcx, rcx
	jz	short .endcolumn
	movd	XMM_DWORD [rdi], xmmA

%endif ; RGB_PIXELSIZE ; ---------------

.endcolumn:
	sfence		; flush the write buffer

.return:
	pop	rbx
	uncollect_args
	mov	rsp,rbp		; rsp <- aligned rbp
	pop	rsp		; rsp <- original rbp
	pop	rbp
	ret

; --------------------------------------------------------------------------
;
; Upsample and color convert for the case of 2:1 horizontal and 2:1 vertical.
;
; GLOBAL(void)
; jsimd_h2v2_merged_upsample_sse2 (JDIMENSION output_width,
;                                  JSAMPIMAGE input_buf,
;                                  JDIMENSION in_row_group_ctr,
;                                  JSAMPARRAY output_buf);
;

; r10 = JDIMENSION output_width
; r11 = JSAMPIMAGE input_buf
; r12 = JDIMENSION in_row_group_ctr
; r13 = JSAMPARRAY output_buf

	align	16
	global	EXTN(jsimd_h2v2_merged_upsample_sse2)

EXTN(jsimd_h2v2_merged_upsample_sse2):
	push	rbp
	mov	rax,rsp
	mov	rbp,rsp
	collect_args
	push	rbx

	mov	rax, r10

	mov	rdi, r11
	mov	rcx, r12
	mov	rsi, JSAMPARRAY [rdi+0*SIZEOF_JSAMPARRAY]
	mov	rbx, JSAMPARRAY [rdi+1*SIZEOF_JSAMPARRAY]
	mov	rdx, JSAMPARRAY [rdi+2*SIZEOF_JSAMPARRAY]
	mov	rdi, r13
	lea	rsi, [rsi+rcx*SIZEOF_JSAMPROW]

	push	rdx			; inptr2
	push	rbx			; inptr1
	push	rsi			; inptr00
	mov	rbx,rsp

	push	rdi
	push	rcx
	push	rax

	%ifdef WIN64
	mov r8, rcx
	mov r9, rdi
	mov rcx, rax
	mov rdx, rbx
	%else
	mov rdx, rcx
	mov rcx, rdi
	mov	rdi, rax
	mov rsi, rbx
	%endif

	call	EXTN(jsimd_h2v1_merged_upsample_sse2)

	pop rax
	pop rcx
	pop rdi
	pop rsi
	pop rbx
	pop rdx

	add	rdi, byte SIZEOF_JSAMPROW	; outptr1
	add	rsi, byte SIZEOF_JSAMPROW	; inptr01

	push	rdx			; inptr2
	push	rbx			; inptr1
	push	rsi			; inptr00
	mov	rbx,rsp

	push	rdi
	push	rcx
	push	rax

	%ifdef WIN64
	mov r8, rcx
	mov r9, rdi
	mov rcx, rax
	mov rdx, rbx
	%else
	mov rdx, rcx
	mov rcx, rdi
	mov	rdi, rax
	mov rsi, rbx
	%endif

	call	EXTN(jsimd_h2v1_merged_upsample_sse2)

	pop rax
	pop rcx
	pop rdi
	pop rsi
	pop rbx
	pop rdx

	pop	rbx
	uncollect_args
	pop	rbp
	ret

; For some reason, the OS X linker does not honor the request to align the
; segment unless we do this.
	align	16