;
; jdclrss2.asm - colorspace conversion (64-bit SSE2)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright 2009 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"
				
; --------------------------------------------------------------------------
	SECTION	SEG_TEXT
	BITS	64
;
; Convert some rows of samples to the output colorspace.
;
; GLOBAL(void)
; jsimd_ycc_rgb_convert_sse2 (JDIMENSION out_width,
;                             JSAMPIMAGE input_buf, JDIMENSION input_row,
;                             JSAMPARRAY output_buf, int num_rows)
;

; r10 = JDIMENSION out_width
; r11 = JSAMPIMAGE input_buf
; r12 = JDIMENSION input_row
; r13 = JSAMPARRAY output_buf
; r14 = int num_rows

%define wk(i)		rbp-(WK_NUM-(i))*SIZEOF_XMMWORD	; xmmword wk[WK_NUM]
%define WK_NUM		2

	align	16
	global	EXTN(jsimd_ycc_rgb_convert_sse2)

EXTN(jsimd_ycc_rgb_convert_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	; num_cols
	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]
	lea	rsi, [rsi+rcx*SIZEOF_JSAMPROW]
	lea	rbx, [rbx+rcx*SIZEOF_JSAMPROW]
	lea	rdx, [rdx+rcx*SIZEOF_JSAMPROW]

	pop	rcx

	mov	rdi, r13
	mov	rax, r14
	test	rax,rax
	jle	near .return
.rowloop:
	push	rax
	push	rdi
	push	rdx
	push	rbx
	push	rsi
	push	rcx			; col

	mov	rsi, JSAMPROW [rsi]	; inptr0
	mov	rbx, JSAMPROW [rbx]	; inptr1
	mov	rdx, JSAMPROW [rdx]	; inptr2
	mov	rdi, JSAMPROW [rdi]	; outptr
.columnloop:

	movdqa	xmm5, XMMWORD [rbx]	; xmm5=Cb(0123456789ABCDEF)
	movdqa	xmm1, XMMWORD [rdx]	; xmm1=Cr(0123456789ABCDEF)

	pcmpeqw	xmm4,xmm4
	pcmpeqw	xmm7,xmm7
	psrlw	xmm4,BYTE_BIT
	psllw	xmm7,7			; xmm7={0xFF80 0xFF80 0xFF80 0xFF80 ..}
	movdqa	xmm0,xmm4		; xmm0=xmm4={0xFF 0x00 0xFF 0x00 ..}

	pand	xmm4,xmm5		; xmm4=Cb(02468ACE)=CbE
	psrlw	xmm5,BYTE_BIT		; xmm5=Cb(13579BDF)=CbO
	pand	xmm0,xmm1		; xmm0=Cr(02468ACE)=CrE
	psrlw	xmm1,BYTE_BIT		; xmm1=Cr(13579BDF)=CrO

	paddw	xmm4,xmm7
	paddw	xmm5,xmm7
	paddw	xmm0,xmm7
	paddw	xmm1,xmm7

	; (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	xmm2,xmm4		; xmm2=CbE
	movdqa	xmm3,xmm5		; xmm3=CbO
	paddw	xmm4,xmm4		; xmm4=2*CbE
	paddw	xmm5,xmm5		; xmm5=2*CbO
	movdqa	xmm6,xmm0		; xmm6=CrE
	movdqa	xmm7,xmm1		; xmm7=CrO
	paddw	xmm0,xmm0		; xmm0=2*CrE
	paddw	xmm1,xmm1		; xmm1=2*CrO

	pmulhw	xmm4,[rel PW_MF0228]	; xmm4=(2*CbE * -FIX(0.22800))
	pmulhw	xmm5,[rel PW_MF0228]	; xmm5=(2*CbO * -FIX(0.22800))
	pmulhw	xmm0,[rel PW_F0402]	; xmm0=(2*CrE * FIX(0.40200))
	pmulhw	xmm1,[rel PW_F0402]	; xmm1=(2*CrO * FIX(0.40200))

	paddw	xmm4,[rel PW_ONE]
	paddw	xmm5,[rel PW_ONE]
	psraw	xmm4,1			; xmm4=(CbE * -FIX(0.22800))
	psraw	xmm5,1			; xmm5=(CbO * -FIX(0.22800))
	paddw	xmm0,[rel PW_ONE]
	paddw	xmm1,[rel PW_ONE]
	psraw	xmm0,1			; xmm0=(CrE * FIX(0.40200))
	psraw	xmm1,1			; xmm1=(CrO * FIX(0.40200))

	paddw	xmm4,xmm2
	paddw	xmm5,xmm3
	paddw	xmm4,xmm2		; xmm4=(CbE * FIX(1.77200))=(B-Y)E
	paddw	xmm5,xmm3		; xmm5=(CbO * FIX(1.77200))=(B-Y)O
	paddw	xmm0,xmm6		; xmm0=(CrE * FIX(1.40200))=(R-Y)E
	paddw	xmm1,xmm7		; xmm1=(CrO * FIX(1.40200))=(R-Y)O

	movdqa	XMMWORD [wk(0)], xmm4	; wk(0)=(B-Y)E
	movdqa	XMMWORD [wk(1)], xmm5	; wk(1)=(B-Y)O

	movdqa    xmm4,xmm2
	movdqa    xmm5,xmm3
	punpcklwd xmm2,xmm6
	punpckhwd xmm4,xmm6
	pmaddwd   xmm2,[rel PW_MF0344_F0285]
	pmaddwd   xmm4,[rel PW_MF0344_F0285]
	punpcklwd xmm3,xmm7
	punpckhwd xmm5,xmm7
	pmaddwd   xmm3,[rel PW_MF0344_F0285]
	pmaddwd   xmm5,[rel PW_MF0344_F0285]

	paddd     xmm2,[rel PD_ONEHALF]
	paddd     xmm4,[rel PD_ONEHALF]
	psrad     xmm2,SCALEBITS
	psrad     xmm4,SCALEBITS
	paddd     xmm3,[rel PD_ONEHALF]
	paddd     xmm5,[rel PD_ONEHALF]
	psrad     xmm3,SCALEBITS
	psrad     xmm5,SCALEBITS

	packssdw  xmm2,xmm4	; xmm2=CbE*-FIX(0.344)+CrE*FIX(0.285)
	packssdw  xmm3,xmm5	; xmm3=CbO*-FIX(0.344)+CrO*FIX(0.285)
	psubw     xmm2,xmm6	; xmm2=CbE*-FIX(0.344)+CrE*-FIX(0.714)=(G-Y)E
	psubw     xmm3,xmm7	; xmm3=CbO*-FIX(0.344)+CrO*-FIX(0.714)=(G-Y)O

	movdqa    xmm5, XMMWORD [rsi]	; xmm5=Y(0123456789ABCDEF)

	pcmpeqw   xmm4,xmm4
	psrlw     xmm4,BYTE_BIT		; xmm4={0xFF 0x00 0xFF 0x00 ..}
	pand      xmm4,xmm5		; xmm4=Y(02468ACE)=YE
	psrlw     xmm5,BYTE_BIT		; xmm5=Y(13579BDF)=YO

	paddw     xmm0,xmm4		; xmm0=((R-Y)E+YE)=RE=R(02468ACE)
	paddw     xmm1,xmm5		; xmm1=((R-Y)O+YO)=RO=R(13579BDF)
	packuswb  xmm0,xmm0		; xmm0=R(02468ACE********)
	packuswb  xmm1,xmm1		; xmm1=R(13579BDF********)

	paddw     xmm2,xmm4		; xmm2=((G-Y)E+YE)=GE=G(02468ACE)
	paddw     xmm3,xmm5		; xmm3=((G-Y)O+YO)=GO=G(13579BDF)
	packuswb  xmm2,xmm2		; xmm2=G(02468ACE********)
	packuswb  xmm3,xmm3		; xmm3=G(13579BDF********)

	paddw     xmm4, XMMWORD [wk(0)]	; xmm4=(YE+(B-Y)E)=BE=B(02468ACE)
	paddw     xmm5, XMMWORD [wk(1)]	; xmm5=(YO+(B-Y)O)=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
	add	rdi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD	; outptr
	jmp	short .out0
.out1:	; --(unaligned)-----------------
	pcmpeqb    xmmH,xmmH			; xmmH=(all 1's)
	maskmovdqu xmmA,xmmH			; movntdqu XMMWORD [rdi], xmmA
	add	rdi, byte SIZEOF_XMMWORD	; outptr
	maskmovdqu xmmD,xmmH			; movntdqu XMMWORD [rdi], xmmD
	add	rdi, byte SIZEOF_XMMWORD	; outptr
	maskmovdqu xmmF,xmmH			; movntdqu XMMWORD [rdi], xmmF
	add	rdi, byte SIZEOF_XMMWORD	; outptr
.out0:
	sub	rcx, byte SIZEOF_XMMWORD
	jz	near .nextrow

	add	rsi, byte SIZEOF_XMMWORD	; inptr0
	add	rbx, byte SIZEOF_XMMWORD	; inptr1
	add	rdx, byte SIZEOF_XMMWORD	; inptr2
	jmp	near .columnloop

.column_st32:
	pcmpeqb	xmmH,xmmH			; xmmH=(all 1's)
	lea	rcx, [rcx+rcx*2]		; imul ecx, RGB_PIXELSIZE
	cmp	rcx, byte 2*SIZEOF_XMMWORD
	jb	short .column_st16
	maskmovdqu xmmA,xmmH			; movntdqu XMMWORD [rdi], xmmA
	add	rdi, byte SIZEOF_XMMWORD	; outptr
	maskmovdqu xmmD,xmmH			; movntdqu XMMWORD [rdi], xmmD
	add	rdi, byte 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
	maskmovdqu xmmA,xmmH			; movntdqu XMMWORD [rdi], xmmA
	add	rdi, byte SIZEOF_XMMWORD	; outptr
	movdqa	xmmA,xmmD
	sub	rcx, byte SIZEOF_XMMWORD
.column_st15:
	mov	rax,rcx
	xor	rcx, byte 0x0F
	shl	rcx, 2
	movd	xmmB,ecx
	psrlq	xmmH,4
	pcmpeqb	xmmE,xmmE
	psrlq	xmmH,xmmB
	psrlq	xmmE,xmmB
	punpcklbw xmmE,xmmH
	; ----------------
	mov	rcx,rdi
	and	rcx, byte SIZEOF_XMMWORD-1
	jz	short .adj0
	add	rax,rcx
	cmp	rax, byte SIZEOF_XMMWORD
	ja	short .adj0
	and	rdi, byte (-SIZEOF_XMMWORD)	; align to 16-byte boundary
	shl	rcx, 3			; pslldq xmmA,ecx & pslldq xmmE,rcx
	movdqa	xmmG,xmmA
	movdqa	xmmC,xmmE
	pslldq	xmmA, SIZEOF_XMMWORD/2
	pslldq	xmmE, SIZEOF_XMMWORD/2
	movd	xmmD,ecx
	sub	rcx, byte (SIZEOF_XMMWORD/2)*BYTE_BIT
	jb	short .adj1
	movd	xmmF,ecx
	psllq	xmmA,xmmF
	psllq	xmmE,xmmF
	jmp	short .adj0
.adj1:	neg	ecx
	movd	xmmF,ecx
	psrlq	xmmA,xmmF
	psrlq	xmmE,xmmF
	psllq	xmmG,xmmD
	psllq	xmmC,xmmD
	por	xmmA,xmmG
	por	xmmE,xmmC
.adj0:	; ----------------
	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [rdi], xmmA

%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
	add	rdi, byte RGB_PIXELSIZE*SIZEOF_XMMWORD	; outptr
	jmp	short .out0
.out1:	; --(unaligned)-----------------
	pcmpeqb    xmmE,xmmE			; xmmE=(all 1's)
	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [rdi], xmmA
	add	rdi, byte SIZEOF_XMMWORD	; outptr
	maskmovdqu xmmD,xmmE			; movntdqu XMMWORD [rdi], xmmD
	add	rdi, byte SIZEOF_XMMWORD	; outptr
	maskmovdqu xmmC,xmmE			; movntdqu XMMWORD [rdi], xmmC
	add	rdi, byte SIZEOF_XMMWORD	; outptr
	maskmovdqu xmmH,xmmE			; movntdqu XMMWORD [rdi], xmmH
	add	rdi, byte SIZEOF_XMMWORD	; outptr
.out0:
	sub	rcx, byte SIZEOF_XMMWORD
	jz	near .nextrow

	add	rsi, byte SIZEOF_XMMWORD	; inptr0
	add	rbx, byte SIZEOF_XMMWORD	; inptr1
	add	rdx, byte SIZEOF_XMMWORD	; inptr2
	jmp	near .columnloop

.column_st32:
	pcmpeqb	xmmE,xmmE			; xmmE=(all 1's)
	cmp	rcx, byte SIZEOF_XMMWORD/2
	jb	short .column_st16
	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [rdi], xmmA
	add	rdi, byte SIZEOF_XMMWORD	; outptr
	maskmovdqu xmmD,xmmE			; movntdqu XMMWORD [rdi], xmmD
	add	rdi, byte 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
	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [rdi], xmmA
	add	rdi, byte SIZEOF_XMMWORD	; outptr
	movdqa	xmmA,xmmD
	sub	rcx, byte SIZEOF_XMMWORD/4
.column_st15:
	cmp	rcx, byte SIZEOF_XMMWORD/16
	jb	near .nextrow
	mov	rax,rcx
	xor	rcx, byte 0x03
	inc	rcx
	shl	rcx, 4
	movd	xmmF,ecx
	psrlq	xmmE,xmmF
	punpcklbw xmmE,xmmE
	; ----------------
	mov	rcx,rdi
	and	rcx, byte SIZEOF_XMMWORD-1
	jz	short .adj0
	lea	rax, [rcx+rax*4]	; RGB_PIXELSIZE
	cmp	rax, byte SIZEOF_XMMWORD
	ja	short .adj0
	and	rdi, byte (-SIZEOF_XMMWORD)	; align to 16-byte boundary
	shl	rcx, 3			; pslldq xmmA,ecx & pslldq xmmE,ecx
	movdqa	xmmB,xmmA
	movdqa	xmmG,xmmE
	pslldq	xmmA, SIZEOF_XMMWORD/2
	pslldq	xmmE, SIZEOF_XMMWORD/2
	movd	xmmC,ecx
	sub	rcx, byte (SIZEOF_XMMWORD/2)*BYTE_BIT
	jb	short .adj1
	movd	xmmH,ecx
	psllq	xmmA,xmmH
	psllq	xmmE,xmmH
	jmp	short .adj0
.adj1:	neg	rcx
	movd	xmmH,ecx
	psrlq	xmmA,xmmH
	psrlq	xmmE,xmmH
	psllq	xmmB,xmmC
	psllq	xmmG,xmmC
	por	xmmA,xmmB
	por	xmmE,xmmG
.adj0:	; ----------------
	maskmovdqu xmmA,xmmE			; movntdqu XMMWORD [rdi], xmmA

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

.nextrow:
	pop	rcx
	pop	rsi
	pop	rbx
	pop	rdx
	pop	rdi
	pop	rax

	add	rsi, byte SIZEOF_JSAMPROW
	add	rbx, byte SIZEOF_JSAMPROW
	add	rdx, byte SIZEOF_JSAMPROW
	add	rdi, byte SIZEOF_JSAMPROW	; output_buf
	dec	rax				; num_rows
	jg	near .rowloop

	sfence		; flush the write buffer

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