diff --git a/common/jpeg/simd/jcqntmmx.asm b/common/jpeg/simd/jcqntmmx.asm
new file mode 100644
index 0000000..6096eaa
--- /dev/null
+++ b/common/jpeg/simd/jcqntmmx.asm
@@ -0,0 +1,271 @@
+;
+; jcqntmmx.asm - sample data conversion and quantization (MMX)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+;
+; 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 "simd/jsimdext.inc"
+%include "simd/jdct.inc"
+
+; --------------------------------------------------------------------------
+	SECTION	SEG_TEXT
+	BITS	32
+;
+; Load data into workspace, applying unsigned->signed conversion
+;
+; GLOBAL(void)
+; jsimd_convsamp_mmx (JSAMPARRAY sample_data, JDIMENSION start_col,
+;                     DCTELEM * workspace);
+;
+
+%define sample_data	ebp+8		; JSAMPARRAY sample_data
+%define start_col	ebp+12		; JDIMENSION start_col
+%define workspace	ebp+16		; DCTELEM * workspace
+
+	align	16
+	global	EXTN(jsimd_convsamp_mmx)
+
+EXTN(jsimd_convsamp_mmx):
+	push	ebp
+	mov	ebp,esp
+	push	ebx
+;	push	ecx		; need not be preserved
+;	push	edx		; need not be preserved
+	push	esi
+	push	edi
+
+	pxor	mm6,mm6			; mm6=(all 0's)
+	pcmpeqw	mm7,mm7
+	psllw	mm7,7			; mm7={0xFF80 0xFF80 0xFF80 0xFF80}
+
+	mov	esi, JSAMPARRAY [sample_data]	; (JSAMPROW *)
+	mov	eax, JDIMENSION [start_col]
+	mov	edi, POINTER [workspace]	; (DCTELEM *)
+	mov	ecx, DCTSIZE/4
+	alignx	16,7
+.convloop:
+	mov	ebx, JSAMPROW [esi+0*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+	mov	edx, JSAMPROW [esi+1*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+
+	movq	mm0, MMWORD [ebx+eax*SIZEOF_JSAMPLE]	; mm0=(01234567)
+	movq	mm1, MMWORD [edx+eax*SIZEOF_JSAMPLE]	; mm1=(89ABCDEF)
+
+	mov	ebx, JSAMPROW [esi+2*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+	mov	edx, JSAMPROW [esi+3*SIZEOF_JSAMPROW]	; (JSAMPLE *)
+
+	movq	mm2, MMWORD [ebx+eax*SIZEOF_JSAMPLE]	; mm2=(GHIJKLMN)
+	movq	mm3, MMWORD [edx+eax*SIZEOF_JSAMPLE]	; mm3=(OPQRSTUV)
+
+	movq      mm4,mm0
+	punpcklbw mm0,mm6		; mm0=(0123)
+	punpckhbw mm4,mm6		; mm4=(4567)
+	movq      mm5,mm1
+	punpcklbw mm1,mm6		; mm1=(89AB)
+	punpckhbw mm5,mm6		; mm5=(CDEF)
+
+	paddw	mm0,mm7
+	paddw	mm4,mm7
+	paddw	mm1,mm7
+	paddw	mm5,mm7
+
+	movq	MMWORD [MMBLOCK(0,0,edi,SIZEOF_DCTELEM)], mm0
+	movq	MMWORD [MMBLOCK(0,1,edi,SIZEOF_DCTELEM)], mm4
+	movq	MMWORD [MMBLOCK(1,0,edi,SIZEOF_DCTELEM)], mm1
+	movq	MMWORD [MMBLOCK(1,1,edi,SIZEOF_DCTELEM)], mm5
+
+	movq      mm0,mm2
+	punpcklbw mm2,mm6		; mm2=(GHIJ)
+	punpckhbw mm0,mm6		; mm0=(KLMN)
+	movq      mm4,mm3
+	punpcklbw mm3,mm6		; mm3=(OPQR)
+	punpckhbw mm4,mm6		; mm4=(STUV)
+
+	paddw	mm2,mm7
+	paddw	mm0,mm7
+	paddw	mm3,mm7
+	paddw	mm4,mm7
+
+	movq	MMWORD [MMBLOCK(2,0,edi,SIZEOF_DCTELEM)], mm2
+	movq	MMWORD [MMBLOCK(2,1,edi,SIZEOF_DCTELEM)], mm0
+	movq	MMWORD [MMBLOCK(3,0,edi,SIZEOF_DCTELEM)], mm3
+	movq	MMWORD [MMBLOCK(3,1,edi,SIZEOF_DCTELEM)], mm4
+
+	add	esi, byte 4*SIZEOF_JSAMPROW
+	add	edi, byte 4*DCTSIZE*SIZEOF_DCTELEM
+	dec	ecx
+	jnz	short .convloop
+
+	emms		; empty MMX state
+
+	pop	edi
+	pop	esi
+;	pop	edx		; need not be preserved
+;	pop	ecx		; need not be preserved
+	pop	ebx
+	pop	ebp
+	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_mmx (JCOEFPTR coef_block, DCTELEM * divisors,
+;                     DCTELEM * workspace);
+;
+
+%define RECIPROCAL(m,n,b) MMBLOCK(DCTSIZE*0+(m),(n),(b),SIZEOF_DCTELEM)
+%define CORRECTION(m,n,b) MMBLOCK(DCTSIZE*1+(m),(n),(b),SIZEOF_DCTELEM)
+%define SCALE(m,n,b)      MMBLOCK(DCTSIZE*2+(m),(n),(b),SIZEOF_DCTELEM)
+%define SHIFT(m,n,b)      MMBLOCK(DCTSIZE*3+(m),(n),(b),SIZEOF_DCTELEM)
+
+%define coef_block	ebp+8		; JCOEFPTR coef_block
+%define divisors	ebp+12		; DCTELEM * divisors
+%define workspace	ebp+16		; DCTELEM * workspace
+
+	align	16
+	global	EXTN(jsimd_quantize_mmx)
+
+EXTN(jsimd_quantize_mmx):
+	push	ebp
+	mov	ebp,esp
+;	push	ebx		; unused
+;	push	ecx		; unused
+;	push	edx		; need not be preserved
+	push	esi
+	push	edi
+
+	mov	esi, POINTER [workspace]
+	mov	edx, POINTER [divisors]
+	mov	edi, JCOEFPTR [coef_block]
+	mov	ah, 2
+	alignx	16,7
+.quantloop1:
+	mov	al, DCTSIZE2/8/2
+	alignx	16,7
+.quantloop2:
+	movq	mm2, MMWORD [MMBLOCK(0,0,esi,SIZEOF_DCTELEM)]
+	movq	mm3, MMWORD [MMBLOCK(0,1,esi,SIZEOF_DCTELEM)]
+
+	movq	mm0,mm2
+	movq	mm1,mm3
+
+	psraw	mm2,(WORD_BIT-1)  ; -1 if value < 0, 0 otherwise
+	psraw	mm3,(WORD_BIT-1)
+
+	pxor	mm0,mm2   ; val = -val
+	pxor	mm1,mm3
+	psubw	mm0,mm2
+	psubw	mm1,mm3
+
+	;
+	; MMX is an annoyingly crappy instruction set. It has two
+	; misfeatures that are causing problems here:
+	;
+	; - All multiplications are signed.
+	;
+	; - The second operand for the shifts is not treated as packed.
+	;
+	;
+	; We work around the first problem by implementing this algorithm:
+	;
+	; unsigned long unsigned_multiply(unsigned short x, unsigned short y)
+	; {
+	;   enum { SHORT_BIT = 16 };
+	;   signed short sx = (signed short) x;
+	;   signed short sy = (signed short) y;
+	;   signed long sz;
+	; 
+	;   sz = (long) sx * (long) sy;     /* signed multiply */
+	; 
+	;   if (sx < 0) sz += (long) sy << SHORT_BIT;
+	;   if (sy < 0) sz += (long) sx << SHORT_BIT;
+	; 
+	;   return (unsigned long) sz;
+	; }
+	;
+	; (note that a negative sx adds _sy_ and vice versa)
+	;
+	; For the second problem, we replace the shift by a multiplication.
+	; Unfortunately that means we have to deal with the signed issue again.
+	;
+
+	paddw	mm0, MMWORD [CORRECTION(0,0,edx)]   ; correction + roundfactor
+	paddw	mm1, MMWORD [CORRECTION(0,1,edx)]
+
+	movq	mm4,mm0   ; store current value for later
+	movq	mm5,mm1
+	pmulhw	mm0, MMWORD [RECIPROCAL(0,0,edx)]   ; reciprocal
+	pmulhw	mm1, MMWORD [RECIPROCAL(0,1,edx)]
+	paddw	mm0,mm4		; reciprocal is always negative (MSB=1),
+	paddw	mm1,mm5   ; so we always need to add the initial value
+	                ; (input value is never negative as we
+	                ; inverted it at the start of this routine)
+
+	; here it gets a bit tricky as both scale
+	; and mm0/mm1 can be negative
+	movq	mm6, MMWORD [SCALE(0,0,edx)]	; scale
+	movq	mm7, MMWORD [SCALE(0,1,edx)]
+	movq	mm4,mm0
+	movq	mm5,mm1
+	pmulhw	mm0,mm6
+	pmulhw	mm1,mm7
+
+	psraw	mm6,(WORD_BIT-1)    ; determine if scale is negative
+	psraw	mm7,(WORD_BIT-1)
+
+	pand	mm6,mm4             ; and add input if it is
+	pand	mm7,mm5
+	paddw	mm0,mm6
+	paddw	mm1,mm7
+
+	psraw	mm4,(WORD_BIT-1)    ; then check if negative input 
+	psraw	mm5,(WORD_BIT-1)
+
+	pand	mm4, MMWORD [SCALE(0,0,edx)]	; and add scale if it is
+	pand	mm5, MMWORD [SCALE(0,1,edx)]
+	paddw	mm0,mm4
+	paddw	mm1,mm5
+
+	pxor	mm0,mm2   ; val = -val
+	pxor	mm1,mm3
+	psubw	mm0,mm2
+	psubw	mm1,mm3
+
+	movq	MMWORD [MMBLOCK(0,0,edi,SIZEOF_DCTELEM)], mm0
+	movq	MMWORD [MMBLOCK(0,1,edi,SIZEOF_DCTELEM)], mm1
+
+	add	esi, byte 8*SIZEOF_DCTELEM
+	add	edx, byte 8*SIZEOF_DCTELEM
+	add	edi, byte 8*SIZEOF_JCOEF
+	dec	al
+	jnz	near .quantloop2
+	dec	ah
+	jnz	near .quantloop1	; to avoid branch misprediction
+
+	emms		; empty MMX state
+
+	pop	edi
+	pop	esi
+;	pop	edx		; need not be preserved
+;	pop	ecx		; unused
+;	pop	ebx		; unused
+	pop	ebp
+	ret
+