diff --git a/common/jpeg/simd/jcsamss2-64.asm b/common/jpeg/simd/jcsamss2-64.asm
new file mode 100644
index 0000000..cf7a776
--- /dev/null
+++ b/common/jpeg/simd/jcsamss2-64.asm
@@ -0,0 +1,324 @@
+;
+; jcsamss2.asm - downsampling (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 "jsimdext.inc"
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Downsample pixel values of a single component.
+; This version handles the common case of 2:1 horizontal and 1:1 vertical,
+; without smoothing.
+;
+; GLOBAL(void)
+; jsimd_h2v1_downsample_sse2 (JDIMENSION image_width, int max_v_samp_factor,
+;                             JDIMENSION v_samp_factor, JDIMENSION width_blocks,
+;                             JSAMPARRAY input_data, JSAMPARRAY output_data);
+;
+
+; r10 = JDIMENSION image_width
+; r11 = int max_v_samp_factor
+; r12 = JDIMENSION v_samp_factor
+; r13 = JDIMENSION width_blocks
+; r14 = JSAMPARRAY input_data
+; r15 = JSAMPARRAY output_data
+
+	align	16
+	global	EXTN(jsimd_h2v1_downsample_sse2)
+
+EXTN(jsimd_h2v1_downsample_sse2):
+	push	rbp
+	mov	rbp,rsp
+	collect_args
+
+	mov rcx, r13
+	shl	rcx,3			; imul rcx,DCTSIZE (rcx = output_cols)
+	jz	near .return
+
+	mov rdx, r10
+
+	; -- expand_right_edge
+
+	push	rcx
+	shl	rcx,1				; output_cols * 2
+	sub	rcx,rdx
+	jle	short .expand_end
+
+	mov	rax, r11
+	test	rax,rax
+	jle	short .expand_end
+
+	cld
+	mov	rsi, r14	; input_data
+.expandloop:
+	push	rax
+	push	rcx
+
+	mov	rdi, JSAMPROW [rsi]
+	add	rdi,rdx
+	mov	al, JSAMPLE [rdi-1]
+
+	rep stosb
+
+	pop	rcx
+	pop	rax
+
+	add	rsi, byte SIZEOF_JSAMPROW
+	dec	rax
+	jg	short .expandloop
+
+.expand_end:
+	pop	rcx				; output_cols
+
+	; -- h2v1_downsample
+
+	mov	rax, r12	; rowctr
+	test	eax,eax
+	jle	near .return
+
+	mov	rdx, 0x00010000		; bias pattern
+	movd	xmm7,edx
+	pcmpeqw	xmm6,xmm6
+	pshufd	xmm7,xmm7,0x00		; xmm7={0, 1, 0, 1, 0, 1, 0, 1}
+	psrlw	xmm6,BYTE_BIT		; xmm6={0xFF 0x00 0xFF 0x00 ..}
+
+	mov	rsi, r14	; input_data
+	mov	rdi, r15	; output_data
+.rowloop:
+	push	rcx
+	push	rdi
+	push	rsi
+
+	mov	rsi, JSAMPROW [rsi]		; inptr
+	mov rdi, JSAMPROW [rdi]		; outptr
+
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jae	short .columnloop
+
+.columnloop_r8:
+	movdqa	xmm0, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	pxor	xmm1,xmm1
+	mov	rcx, SIZEOF_XMMWORD
+	jmp	short .downsample
+
+.columnloop:
+	movdqa	xmm0, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	movdqa	xmm1, XMMWORD [rsi+1*SIZEOF_XMMWORD]
+
+.downsample:
+	movdqa	xmm2,xmm0
+	movdqa	xmm3,xmm1
+
+	pand	xmm0,xmm6
+	psrlw	xmm2,BYTE_BIT
+	pand	xmm1,xmm6
+	psrlw	xmm3,BYTE_BIT
+
+	paddw	xmm0,xmm2
+	paddw	xmm1,xmm3
+	paddw	xmm0,xmm7
+	paddw	xmm1,xmm7
+	psrlw	xmm0,1
+	psrlw	xmm1,1
+
+	packuswb xmm0,xmm1
+
+	movdqa	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm0
+
+	sub	rcx, byte SIZEOF_XMMWORD	; outcol
+	add	rsi, byte 2*SIZEOF_XMMWORD	; inptr
+	add	rdi, byte 1*SIZEOF_XMMWORD	; outptr
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jae	short .columnloop
+	test	rcx,rcx
+	jnz	short .columnloop_r8
+
+	pop	rsi
+	pop	rdi
+	pop	rcx
+
+	add	rsi, byte SIZEOF_JSAMPROW	; input_data
+	add	rdi, byte SIZEOF_JSAMPROW	; output_data
+	dec	rax				; rowctr
+	jg	near .rowloop
+
+.return:
+	uncollect_args
+	pop	rbp
+	ret
+
+; --------------------------------------------------------------------------
+;
+; Downsample pixel values of a single component.
+; This version handles the standard case of 2:1 horizontal and 2:1 vertical,
+; without smoothing.
+;
+; GLOBAL(void)
+; jsimd_h2v2_downsample_sse2 (JDIMENSION image_width, int max_v_samp_factor,
+;                             JDIMENSION v_samp_factor, JDIMENSION width_blocks,
+;                             JSAMPARRAY input_data, JSAMPARRAY output_data);
+;
+
+; r10 = JDIMENSION image_width
+; r11 = int max_v_samp_factor
+; r12 = JDIMENSION v_samp_factor
+; r13 = JDIMENSION width_blocks
+; r14 = JSAMPARRAY input_data
+; r15 = JSAMPARRAY output_data
+
+	align	16
+	global	EXTN(jsimd_h2v2_downsample_sse2)
+
+EXTN(jsimd_h2v2_downsample_sse2):
+	push	rbp
+	mov	rbp,rsp
+	collect_args
+
+	mov	rcx, r13
+	shl	rcx,3			; imul rcx,DCTSIZE (rcx = output_cols)
+	jz	near .return
+
+	mov	rdx, r10
+
+	; -- expand_right_edge
+
+	push	rcx
+	shl	rcx,1				; output_cols * 2
+	sub	rcx,rdx
+	jle	short .expand_end
+
+	mov	rax, r11
+	test	rax,rax
+	jle	short .expand_end
+
+	cld
+	mov	rsi, r14	; input_data
+.expandloop:
+	push	rax
+	push	rcx
+
+	mov	rdi, JSAMPROW [rsi]
+	add	rdi,rdx
+	mov	al, JSAMPLE [rdi-1]
+
+	rep stosb
+
+	pop	rcx
+	pop	rax
+
+	add	rsi, byte SIZEOF_JSAMPROW
+	dec	rax
+	jg	short .expandloop
+
+.expand_end:
+	pop	rcx				; output_cols
+
+	; -- h2v2_downsample
+
+	mov	rax, r12	; rowctr
+	test	rax,rax
+	jle	near .return
+
+	mov	rdx, 0x00020001		; bias pattern
+	movd	xmm7,edx
+	pcmpeqw	xmm6,xmm6
+	pshufd	xmm7,xmm7,0x00		; xmm7={1, 2, 1, 2, 1, 2, 1, 2}
+	psrlw	xmm6,BYTE_BIT		; xmm6={0xFF 0x00 0xFF 0x00 ..}
+
+	mov	rsi, r14	; input_data
+	mov	rdi, r15	; output_data
+.rowloop:
+	push	rcx
+	push	rdi
+	push	rsi
+
+	mov	rdx, JSAMPROW [rsi+0*SIZEOF_JSAMPROW]	; inptr0
+	mov	rsi, JSAMPROW [rsi+1*SIZEOF_JSAMPROW]	; inptr1
+	mov	rdi, JSAMPROW [rdi]			; outptr
+
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jae	short .columnloop
+
+.columnloop_r8:
+	movdqa	xmm0, XMMWORD [rdx+0*SIZEOF_XMMWORD]
+	movdqa	xmm1, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	pxor	xmm2,xmm2
+	pxor	xmm3,xmm3
+	mov	rcx, SIZEOF_XMMWORD
+	jmp	short .downsample
+
+.columnloop:
+	movdqa	xmm0, XMMWORD [rdx+0*SIZEOF_XMMWORD]
+	movdqa	xmm1, XMMWORD [rsi+0*SIZEOF_XMMWORD]
+	movdqa	xmm2, XMMWORD [rdx+1*SIZEOF_XMMWORD]
+	movdqa	xmm3, XMMWORD [rsi+1*SIZEOF_XMMWORD]
+
+.downsample:
+	movdqa	xmm4,xmm0
+	movdqa	xmm5,xmm1
+	pand	xmm0,xmm6
+	psrlw	xmm4,BYTE_BIT
+	pand	xmm1,xmm6
+	psrlw	xmm5,BYTE_BIT
+	paddw	xmm0,xmm4
+	paddw	xmm1,xmm5
+
+	movdqa	xmm4,xmm2
+	movdqa	xmm5,xmm3
+	pand	xmm2,xmm6
+	psrlw	xmm4,BYTE_BIT
+	pand	xmm3,xmm6
+	psrlw	xmm5,BYTE_BIT
+	paddw	xmm2,xmm4
+	paddw	xmm3,xmm5
+
+	paddw	xmm0,xmm1
+	paddw	xmm2,xmm3
+	paddw	xmm0,xmm7
+	paddw	xmm2,xmm7
+	psrlw	xmm0,2
+	psrlw	xmm2,2
+
+	packuswb xmm0,xmm2
+
+	movdqa	XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm0
+
+	sub	rcx, byte SIZEOF_XMMWORD	; outcol
+	add	rdx, byte 2*SIZEOF_XMMWORD	; inptr0
+	add	rsi, byte 2*SIZEOF_XMMWORD	; inptr1
+	add	rdi, byte 1*SIZEOF_XMMWORD	; outptr
+	cmp	rcx, byte SIZEOF_XMMWORD
+	jae	near .columnloop
+	test	rcx,rcx
+	jnz	near .columnloop_r8
+
+	pop	rsi
+	pop	rdi
+	pop	rcx
+
+	add	rsi, byte 2*SIZEOF_JSAMPROW	; input_data
+	add	rdi, byte 1*SIZEOF_JSAMPROW	; output_data
+	dec	rax				; rowctr
+	jg	near .rowloop
+
+.return:
+	uncollect_args
+	pop	rbp
+	ret