diff --git a/common/jpeg/simd/jcqnts2i-64.asm b/common/jpeg/simd/jcqnts2i-64.asm
new file mode 100644
index 0000000..d561590
--- /dev/null
+++ b/common/jpeg/simd/jcqnts2i-64.asm
@@ -0,0 +1,181 @@
+;
+; jcqnts2i.asm - sample data conversion and quantization (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"
+%include "jdct.inc"
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	64
+;
+; Load data into workspace, applying unsigned->signed conversion
+;
+; GLOBAL(void)
+; jsimd_convsamp_sse2 (JSAMPARRAY sample_data, JDIMENSION start_col,
+;                      DCTELEM * workspace);
+;
+
+; r10 = JSAMPARRAY sample_data
+; r11 = JDIMENSION start_col
+; r12 = DCTELEM * workspace
+
+	align	16
+	global	EXTN(jsimd_convsamp_sse2)
+
+EXTN(jsimd_convsamp_sse2):
+	push	rbp
+	mov	rbp,rsp
+	push	rbx
+	collect_args
+
+	pxor	xmm6,xmm6		; xmm6=(all 0's)
+	pcmpeqw	xmm7,xmm7
+	psllw	xmm7,7			; xmm7={0xFF80 0xFF80 0xFF80 0xFF80 ..}
+
+	mov rsi, r10
+	mov rax, r11
+	mov rdi, r12
+	mov	rcx, DCTSIZE/4
+.convloop:
+	mov	rbx, JSAMPROW [rsi+0*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+	mov rdx, JSAMPROW [rsi+1*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+
+	movq	xmm0, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE]	; xmm0=(01234567)
+	movq	xmm1, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE]	; xmm1=(89ABCDEF)
+
+	mov	rbx, JSAMPROW [rsi+2*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+	mov	rdx, JSAMPROW [rsi+3*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+
+	movq	xmm2, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE]	; xmm2=(GHIJKLMN)
+	movq	xmm3, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE]	; xmm3=(OPQRSTUV)
+
+	punpcklbw xmm0,xmm6		; xmm0=(01234567)
+	punpcklbw xmm1,xmm6		; xmm1=(89ABCDEF)
+	paddw     xmm0,xmm7
+	paddw     xmm1,xmm7
+	punpcklbw xmm2,xmm6		; xmm2=(GHIJKLMN)
+	punpcklbw xmm3,xmm6		; xmm3=(OPQRSTUV)
+	paddw     xmm2,xmm7
+	paddw     xmm3,xmm7
+
+	movdqa	XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_DCTELEM)], xmm0
+	movdqa	XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_DCTELEM)], xmm1
+	movdqa	XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_DCTELEM)], xmm2
+	movdqa	XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_DCTELEM)], xmm3
+
+	add	rsi, byte 4*SIZEOF_JSAMPROW
+	add	rdi, byte 4*DCTSIZE*SIZEOF_DCTELEM
+	dec	rcx
+	jnz	short .convloop
+
+	uncollect_args
+	pop	rbx
+	pop	rbp
+	ret
+
+; --------------------------------------------------------------------------
+;
+; Quantize/descale the coefficients, and store into coef_block
+;
+; This implementation is based on an algorithm described in
+;   "How to optimize for the Pentium family of microprocessors"
+;   (http://www.agner.org/assem/).
+;
+; GLOBAL(void)
+; jsimd_quantize_sse2 (JCOEFPTR coef_block, DCTELEM * divisors,
+;                      DCTELEM * workspace);
+;
+
+%define RECIPROCAL(m,n,b) XMMBLOCK(DCTSIZE*0+(m),(n),(b),SIZEOF_DCTELEM)
+%define CORRECTION(m,n,b) XMMBLOCK(DCTSIZE*1+(m),(n),(b),SIZEOF_DCTELEM)
+%define SCALE(m,n,b)      XMMBLOCK(DCTSIZE*2+(m),(n),(b),SIZEOF_DCTELEM)
+
+; r10 = JCOEFPTR coef_block
+; r11 = DCTELEM * divisors
+; r12 = DCTELEM * workspace
+
+	align	16
+	global	EXTN(jsimd_quantize_sse2)
+
+EXTN(jsimd_quantize_sse2):
+	push	rbp
+	mov	rbp,rsp
+	collect_args
+
+	mov rsi, r12
+	mov rdx, r11
+	mov rdi, r10
+	mov	rax, DCTSIZE2/32
+.quantloop:
+	movdqa	xmm4, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_DCTELEM)]
+	movdqa	xmm5, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_DCTELEM)]
+	movdqa	xmm6, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_DCTELEM)]
+	movdqa	xmm7, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_DCTELEM)]
+	movdqa	xmm0,xmm4
+	movdqa	xmm1,xmm5
+	movdqa	xmm2,xmm6
+	movdqa	xmm3,xmm7
+	psraw	xmm4,(WORD_BIT-1)
+	psraw	xmm5,(WORD_BIT-1)
+	psraw	xmm6,(WORD_BIT-1)
+	psraw	xmm7,(WORD_BIT-1)
+	pxor	xmm0,xmm4
+	pxor	xmm1,xmm5
+	pxor	xmm2,xmm6
+	pxor	xmm3,xmm7
+	psubw	xmm0,xmm4		; if (xmm0 < 0) xmm0 = -xmm0;
+	psubw	xmm1,xmm5		; if (xmm1 < 0) xmm1 = -xmm1;
+	psubw	xmm2,xmm6		; if (xmm2 < 0) xmm2 = -xmm2;
+	psubw	xmm3,xmm7		; if (xmm3 < 0) xmm3 = -xmm3;
+
+	paddw	xmm0, XMMWORD [CORRECTION(0,0,rdx)]  ; correction + roundfactor
+	paddw	xmm1, XMMWORD [CORRECTION(1,0,rdx)]
+	paddw	xmm2, XMMWORD [CORRECTION(2,0,rdx)]
+	paddw	xmm3, XMMWORD [CORRECTION(3,0,rdx)]
+	pmulhuw	xmm0, XMMWORD [RECIPROCAL(0,0,rdx)]  ; reciprocal
+	pmulhuw	xmm1, XMMWORD [RECIPROCAL(1,0,rdx)]
+	pmulhuw	xmm2, XMMWORD [RECIPROCAL(2,0,rdx)]
+	pmulhuw	xmm3, XMMWORD [RECIPROCAL(3,0,rdx)]
+	pmulhuw	xmm0, XMMWORD [SCALE(0,0,rdx)]	; scale
+	pmulhuw	xmm1, XMMWORD [SCALE(1,0,rdx)]
+	pmulhuw	xmm2, XMMWORD [SCALE(2,0,rdx)]
+	pmulhuw	xmm3, XMMWORD [SCALE(3,0,rdx)]
+
+	pxor	xmm0,xmm4
+	pxor	xmm1,xmm5
+	pxor	xmm2,xmm6
+	pxor	xmm3,xmm7
+	psubw	xmm0,xmm4
+	psubw	xmm1,xmm5
+	psubw	xmm2,xmm6
+	psubw	xmm3,xmm7
+	movdqa	XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_DCTELEM)], xmm0
+	movdqa	XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_DCTELEM)], xmm1
+	movdqa	XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_DCTELEM)], xmm2
+	movdqa	XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_DCTELEM)], xmm3
+
+	add	rsi, byte 32*SIZEOF_DCTELEM
+	add	rdx, byte 32*SIZEOF_DCTELEM
+	add	rdi, byte 32*SIZEOF_JCOEF
+	dec	rax
+	jnz	near .quantloop
+
+	uncollect_args
+	pop	rbp
+	ret