diff --git a/common/jpeg/simd/jcqnts2f-64.asm b/common/jpeg/simd/jcqnts2f-64.asm
new file mode 100644
index 0000000..51d6307
--- /dev/null
+++ b/common/jpeg/simd/jcqnts2f-64.asm
@@ -0,0 +1,152 @@
+;
+; jcqnts2f.asm - sample data conversion and quantization (64-bit SSE & 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_float_sse2 (JSAMPARRAY sample_data, JDIMENSION start_col,
+;                            FAST_FLOAT * workspace);
+;
+
+; r10 = JSAMPARRAY sample_data
+; r11 = JDIMENSION start_col
+; r12 = FAST_FLOAT * workspace
+
+	align	16
+	global	EXTN(jsimd_convsamp_float_sse2)
+
+EXTN(jsimd_convsamp_float_sse2):
+	push	rbp
+	mov	rbp,rsp
+	push	rbx
+	collect_args
+
+	pcmpeqw  xmm7,xmm7
+	psllw    xmm7,7
+	packsswb xmm7,xmm7		; xmm7 = PB_CENTERJSAMPLE (0x808080..)
+
+	mov rsi, r10
+	mov	rax, r11
+	mov rdi, r12
+	mov	rcx, DCTSIZE/2
+.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]
+	movq	xmm1, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE]
+
+	psubb	xmm0,xmm7			; xmm0=(01234567)
+	psubb	xmm1,xmm7			; xmm1=(89ABCDEF)
+
+	punpcklbw xmm0,xmm0			; xmm0=(*0*1*2*3*4*5*6*7)
+	punpcklbw xmm1,xmm1			; xmm1=(*8*9*A*B*C*D*E*F)
+
+	punpcklwd xmm2,xmm0			; xmm2=(***0***1***2***3)
+	punpckhwd xmm0,xmm0			; xmm0=(***4***5***6***7)
+	punpcklwd xmm3,xmm1			; xmm3=(***8***9***A***B)
+	punpckhwd xmm1,xmm1			; xmm1=(***C***D***E***F)
+
+	psrad     xmm2,(DWORD_BIT-BYTE_BIT)	; xmm2=(0123)
+	psrad     xmm0,(DWORD_BIT-BYTE_BIT)	; xmm0=(4567)
+	cvtdq2ps  xmm2,xmm2			; xmm2=(0123)
+	cvtdq2ps  xmm0,xmm0			; xmm0=(4567)
+	psrad     xmm3,(DWORD_BIT-BYTE_BIT)	; xmm3=(89AB)
+	psrad     xmm1,(DWORD_BIT-BYTE_BIT)	; xmm1=(CDEF)
+	cvtdq2ps  xmm3,xmm3			; xmm3=(89AB)
+	cvtdq2ps  xmm1,xmm1			; xmm1=(CDEF)
+
+	movaps	XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_FAST_FLOAT)], xmm2
+	movaps	XMMWORD [XMMBLOCK(0,1,rdi,SIZEOF_FAST_FLOAT)], xmm0
+	movaps	XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_FAST_FLOAT)], xmm3
+	movaps	XMMWORD [XMMBLOCK(1,1,rdi,SIZEOF_FAST_FLOAT)], xmm1
+
+	add	rsi, byte 2*SIZEOF_JSAMPROW
+	add	rdi, byte 2*DCTSIZE*SIZEOF_FAST_FLOAT
+	dec	rcx
+	jnz	short .convloop
+
+	uncollect_args
+	pop	rbx
+	pop	rbp
+	ret
+
+
+; --------------------------------------------------------------------------
+;
+; Quantize/descale the coefficients, and store into coef_block
+;
+; GLOBAL(void)
+; jsimd_quantize_float_sse2 (JCOEFPTR coef_block, FAST_FLOAT * divisors,
+;                         FAST_FLOAT * workspace);
+;
+
+; r10 = JCOEFPTR coef_block
+; r11 = FAST_FLOAT * divisors
+; r12 = FAST_FLOAT * workspace
+
+	align	16
+	global	EXTN(jsimd_quantize_float_sse2)
+
+EXTN(jsimd_quantize_float_sse2):
+	push	rbp
+	mov	rbp,rsp
+	collect_args
+
+	mov rsi, r12
+	mov rdx, r11
+	mov rdi, r10
+	mov	rax, DCTSIZE2/16
+.quantloop:
+	movaps	xmm0, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_FAST_FLOAT)]
+	movaps	xmm1, XMMWORD [XMMBLOCK(0,1,rsi,SIZEOF_FAST_FLOAT)]
+	mulps	xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_FAST_FLOAT)]
+	mulps	xmm1, XMMWORD [XMMBLOCK(0,1,rdx,SIZEOF_FAST_FLOAT)]
+	movaps	xmm2, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_FAST_FLOAT)]
+	movaps	xmm3, XMMWORD [XMMBLOCK(1,1,rsi,SIZEOF_FAST_FLOAT)]
+	mulps	xmm2, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_FAST_FLOAT)]
+	mulps	xmm3, XMMWORD [XMMBLOCK(1,1,rdx,SIZEOF_FAST_FLOAT)]
+
+	cvtps2dq xmm0,xmm0
+	cvtps2dq xmm1,xmm1
+	cvtps2dq xmm2,xmm2
+	cvtps2dq xmm3,xmm3
+
+	packssdw xmm0,xmm1
+	packssdw xmm2,xmm3
+
+	movdqa	XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_JCOEF)], xmm0
+	movdqa	XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_JCOEF)], xmm2
+
+	add	rsi, byte 16*SIZEOF_FAST_FLOAT
+	add	rdx, byte 16*SIZEOF_FAST_FLOAT
+	add	rdi, byte 16*SIZEOF_JCOEF
+	dec	rax
+	jnz	short .quantloop
+
+	uncollect_args
+	pop	rbp
+	ret