[Processing/x86] DyadicBilinearDownsample optimizations

Average vertically before horizontally; horizontal averaging is more worksome. Doing the vertical averaging first reduces the number of horizontal averages by half. Use pmaddubsw and pavgw to do the horizontal averaging for a slight performance improvement. Minor tweaks. Improve the SSSE3 dyadic downsample routines and drop the SSE4 routines. The non-temporal loads used in the SSE4 routines do nothing for cache- backed memory AFAIK. Adjust tests because averaging vertically first gives slightly different output. ~2.39x speedup for the widthx32 routine on Haswell when not memory-bound. ~2.20x speedup for the widthx16 routine on Haswell when not memory-bound. Note that the widthx16 routine can be unrolled for further speedup.

Sindre Aamås committed 10 years ago

Commit 8a0af4a1 parent 7cbb75e7 files · +95 −372Browse files

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codec/processing/src/downsample/downsample.cpp +0 −2
codec/processing/src/downsample/downsample.h +0 −4
codec/processing/src/x86/downsample_bilinear.asm +46 −356

codec/processing/src/downsample/downsample.cpp+0−2

@@ -102,8 +102,6 @@ void CDownsampling::InitDownsampleFuncs (SDownsampleFuncs& sDownsampleFunc, int · 101 unmodified lines
102	102	sDownsampleFunc.pfGeneralRatioLuma = GeneralBilinearFastDownsamplerWrap_ssse3;
103	103	}
104	104	if (iCpuFlag & WELS_CPU_SSE41) {
105		− sDownsampleFunc.pfHalfAverageWidthx32 = DyadicBilinearDownsamplerWidthx32_sse4;
106		− sDownsampleFunc.pfHalfAverageWidthx16 = DyadicBilinearDownsamplerWidthx16_sse4;
107	105	sDownsampleFunc.pfOneThirdDownsampler = DyadicBilinearOneThirdDownsampler_sse4;
108	106	sDownsampleFunc.pfQuarterDownsampler = DyadicBilinearQuarterDownsampler_sse4;
109	107	sDownsampleFunc.pfGeneralRatioChroma = GeneralBilinearAccurateDownsamplerWrap_sse41;

codec/processing/src/downsample/downsample.h+0−4

@@ -94,10 +94,6 @@ HalveDownsampleFunc DyadicBilinearDownsamplerWidthx32_sse; · 93 unmodified lines
94	94	HalveDownsampleFunc DyadicBilinearDownsamplerWidthx16_ssse3;
95	95	// iSrcWidth= x32 pixels
96	96	HalveDownsampleFunc DyadicBilinearDownsamplerWidthx32_ssse3;
97		−// iSrcWidth= x16 pixels
98		−HalveDownsampleFunc DyadicBilinearDownsamplerWidthx16_sse4;
99		−// iSrcWidth= x32 pixels
100		−HalveDownsampleFunc DyadicBilinearDownsamplerWidthx32_sse4;
101	97
102	98	GeneralDownsampleFunc GeneralBilinearFastDownsamplerWrap_sse2;
103	99	GeneralDownsampleFunc GeneralBilinearAccurateDownsamplerWrap_sse2;

codec/processing/src/x86/downsample_bilinear.asm+46−356

@@ -40,6 +40,10 @@ · 39 unmodified lines
40	40	;*************************************************************************/
41	41	%include "asm_inc.asm"
42	42
	43	+%ifdef __NASM_VER__
	44	+ %use smartalign
	45	+%endif
	46	+
43	47	;***********************************************************************
44	48	; Macros and other preprocessor constants
45	49	;***********************************************************************
@@ -471,24 +475,12 @@ WELS_EXTERN DyadicBilinearDownsamplerWidthx8_sse · 425 unmodified lines
471	475
472	476
473	477
474		−; got about 50% improvement over DyadicBilinearDownsamplerWidthx32_sse
475	478	;***********************************************************************
476	479	; void DyadicBilinearDownsamplerWidthx32_ssse3( unsigned char* pDst, const int iDstStride,
477	480	; unsigned char* pSrc, const int iSrcStride,
478	481	; const int iSrcWidth, const int iSrcHeight );
479	482	;***********************************************************************
480	483	WELS_EXTERN DyadicBilinearDownsamplerWidthx32_ssse3
481		− ;push ebx
482		− ;push edx
483		− ;push esi
484		− ;push edi
485		− ;push ebp
486		−
487		− ;mov edi, [esp+24] ; pDst
488		− ;mov edx, [esp+28] ; iDstStride
489		− ;mov esi, [esp+32] ; pSrc
490		− ;mov ecx, [esp+36] ; iSrcStride
491		− ;mov ebp, [esp+44] ; iSrcHeight
492	484	%ifdef X86_32
493	485	push r6
494	486	%assign push_num 1
@@ -496,7 +488,7 @@ WELS_EXTERN DyadicBilinearDownsamplerWidthx32_ssse3 · 1 unmodified line
496	488	%assign push_num 0
497	489	%endif
498	490	LOAD_6_PARA
499		− PUSH_XMM 8
	491	+ PUSH_XMM 4
500	492	SIGN_EXTENSION r1, r1d
501	493	SIGN_EXTENSION r3, r3d
502	494	SIGN_EXTENSION r4, r4d
@@ -508,96 +500,44 @@ WELS_EXTERN DyadicBilinearDownsamplerWidthx32_ssse3 · 5 unmodified lines
508	500	%endif
509	501	sar r5, $01 ; iSrcHeight >> 1
510	502
511		− movdqa xmm7, [shufb_mask_low] ; mask low
512		− movdqa xmm6, [shufb_mask_high] ; mask high
	503	+ WELS_DB1 xmm3
	504	+ WELS_Zero xmm2
	505	+ sar r4, $01 ; iSrcWidth >> 1
	506	+ add r0, r4 ; pDst += iSrcWidth >> 1
513	507
514	508	.yloops4:
515		− ;mov eax, [esp+40] ; iSrcWidth
516		− ;sar eax, $01 ; iSrcWidth >> 1
517		− ;mov ebx, eax ; iDstWidth restored at ebx
518		− ;sar eax, $04 ; (iSrcWidth >> 1) / 16 ; loop count = num_of_mb
519		− ;neg ebx ; - (iSrcWidth >> 1)
520	509	%ifdef X86_32
521	510	mov r4, arg5
522	511	%else
523	512	mov r4, r12
524	513	%endif
525	514	sar r4, $01 ; iSrcWidth >> 1
526		− mov r6, r4 ; iDstWidth restored at ebx
527		− sar r4, $04 ; (iSrcWidth >> 1) / 16 ; loop count = num_of_mb
528		− neg r6 ; - (iSrcWidth >> 1)
	515	+ neg r4 ; -(iSrcWidth >> 1)
	516	+ mov r6, r4
	517	+ align 16
529	518	; each loop = source bandwidth: 32 bytes
530	519	.xloops4:
531		− ; 1st part horizonal loop: x16 bytes
532		− ; mem hi<- ->lo
533		− ;1st Line Src: xmm0: h H g G f F e E d D c C b B a A
534		− ; xmm1: p P o O n N m M l L k K j J i I
535		− ;2nd Line Src: xmm2: h H g G f F e E d D c C b B a A
536		− ; xmm3: p P o O n N m M l L k K j J i I
537		− ;=> target:
538		− ;: P O N M L K J I H G F E D C B A
539		− ;: p o n m l k j i h g f e d c b a
540		− ;: P .. A
541		− ;: p .. a
542		−
543		− ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
544		− movdqa xmm0, [r2] ; 1st_src_line
545		− movdqa xmm1, [r2+16] ; 1st_src_line + 16
546		− movdqa xmm2, [r2+r3] ; 2nd_src_line
547		− movdqa xmm3, [r2+r3+16] ; 2nd_src_line + 16
548		−
549		− ; packing & avg
550		− movdqa xmm4, xmm0 ; h H g G f F e E d D c C b B a A
551		− pshufb xmm0, xmm7 ; 0 H 0 G 0 F 0 E 0 D 0 C 0 B 0 A
552		− pshufb xmm4, xmm6 ; 0 h 0 g 0 f 0 e 0 d 0 c 0 b 0 a
553		− ; another implementation for xmm4 high bits
554		−; psubb xmm4, xmm0 ; h 0 g 0 f 0 e 0 d 0 c 0 b 0 a 0
555		−; psrlw xmm4, 8 ; 0 h 0 g 0 f 0 e 0 d 0 c 0 b 0 a
556		− pavgb xmm0, xmm4
557		−
558		− movdqa xmm5, xmm1
559		− pshufb xmm1, xmm7
560		− pshufb xmm5, xmm6
561		−; psubb xmm5, xmm1
562		−; psrlw xmm5, 8
563		− pavgb xmm1, xmm5
564		−
565		− movdqa xmm4, xmm2
566		− pshufb xmm2, xmm7
567		− pshufb xmm4, xmm6
568		−; psubb xmm4, xmm2
569		−; psrlw xmm4, 8
570		− pavgb xmm2, xmm4
571		−
572		− movdqa xmm5, xmm3
573		− pshufb xmm3, xmm7
574		− pshufb xmm5, xmm6
575		−; psubb xmm5, xmm3
576		−; psrlw xmm5, 8
577		− pavgb xmm3, xmm5
578		−
579		− packuswb xmm0, xmm1
580		− packuswb xmm2, xmm3
581		− pavgb xmm0, xmm2
582		−
583		− ; write pDst
584		− movdqa [r0], xmm0
585		−
586		− ; next SMB
587		− lea r2, [r2+32]
588		− lea r0, [r0+16]
589		−
590		− dec r4
591		− jg near .xloops4
	520	+ movdqa xmm0, [r2+r3]
	521	+ movdqa xmm1, [r2+r3+16]
	522	+ pavgb xmm0, [r2] ; avg vertical pixels 0-15
	523	+ pavgb xmm1, [r2+16] ; avg vertical pixels 16-31
	524	+ add r2, 32 ; pSrc += 32
	525	+ pmaddubsw xmm0, xmm3 ; pairwise horizontal sum neighboring pixels 0-15
	526	+ pmaddubsw xmm1, xmm3 ; pairwise horizontal sum neighboring pixels 16-31
	527	+ pavgw xmm0, xmm2 ; (sum + 1) >> 1
	528	+ pavgw xmm1, xmm2 ; (sum + 1) >> 1
	529	+ packuswb xmm0, xmm1 ; pack words to bytes
	530	+ movdqa [r0+r4], xmm0 ; store results
	531	+ add r4, 16
	532	+ jl .xloops4
592	533
593	534	; next line
594	535	lea r2, [r2+2*r3] ; next end of lines
595	536	lea r2, [r2+2r6] ; reset to base 0 [- 2 iDstWidth]
596	537	lea r0, [r0+r1]
597		− lea r0, [r0+r6] ; reset to base 0 [- iDstWidth]
598	538
599		− dec r5
600		− jg near .yloops4
	539	+ sub r5, 1
	540	+ jg .yloops4
601	541
602	542	%ifndef X86_32
603	543	pop r12
@@ -623,7 +563,7 @@ WELS_EXTERN DyadicBilinearDownsamplerWidthx16_ssse3 · 19 unmodified lines
623	563	%assign push_num 0
624	564	%endif
625	565	LOAD_6_PARA
626		− PUSH_XMM 6
	566	+ PUSH_XMM 4
627	567	SIGN_EXTENSION r1, r1d
628	568	SIGN_EXTENSION r3, r3d
629	569	SIGN_EXTENSION r4, r4d
@@ -634,8 +574,11 @@ WELS_EXTERN DyadicBilinearDownsamplerWidthx16_ssse3 · 4 unmodified lines
634	574	mov r12, r4
635	575	%endif
636	576	sar r5, $01 ; iSrcHeight >> 1
637		− movdqa xmm5, [shufb_mask_low] ; mask low
638		− movdqa xmm4, [shufb_mask_high] ; mask high
	577	+ WELS_DB1 xmm3
	578	+ WELS_Zero xmm2
	579	+ add r2, r4 ; pSrc += iSrcWidth
	580	+ sar r4, $01 ; iSrcWidth >> 1
	581	+ add r0, r4 ; pDst += iSrcWidth >> 1
639	582
640	583	.yloops5:
641	584	%ifdef X86_32
@@ -644,279 +587,26 @@ WELS_EXTERN DyadicBilinearDownsamplerWidthx16_ssse3 · 2 unmodified lines
644	587	mov r4, r12
645	588	%endif
646	589	sar r4, $01 ; iSrcWidth >> 1
647		− mov r6, r4 ; iDstWidth restored at ebx
648		− sar r4, $03 ; (iSrcWidth >> 1) / 8 ; loop count = num_of_mb
649		− neg r6 ; - (iSrcWidth >> 1)
	590	+ neg r4 ; -(iSrcWidth >> 1)
	591	+ lea r6, [r2+r3] ; pSrc + iSrcStride
	592	+ align 16
650	593	; each loop = source bandwidth: 16 bytes
651	594	.xloops5:
652		− ; horizonal loop: x16 bytes by source
653		− ; mem hi<- ->lo
654		− ;1st line pSrc: xmm0: h H g G f F e E d D c C b B a A
655		− ;2nd line pSrc: xmm1: p P o O n N m M l L k K j J i I
656		− ;=> target:
657		− ;: H G F E D C B A, P O N M L K J I
658		− ;: h g f e d c b a, p o n m l k j i
659		−
660		− ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
661		− movdqa xmm0, [r2] ; 1st_src_line
662		− movdqa xmm1, [r2+r3] ; 2nd_src_line
663		−
664		− ; packing & avg
665		− movdqa xmm2, xmm0 ; h H g G f F e E d D c C b B a A
666		− pshufb xmm0, xmm5 ; 0 H 0 G 0 F 0 E 0 D 0 C 0 B 0 A
667		− pshufb xmm2, xmm4 ; 0 h 0 g 0 f 0 e 0 d 0 c 0 b 0 a
668		− ; another implementation for xmm2 high bits
669		−; psubb xmm2, xmm0 ; h 0 g 0 f 0 e 0 d 0 c 0 b 0 a 0
670		−; psrlw xmm2, 8 ; 0 h 0 g 0 f 0 e 0 d 0 c 0 b 0 a
671		− pavgb xmm0, xmm2
672		−
673		− movdqa xmm3, xmm1
674		− pshufb xmm1, xmm5
675		− pshufb xmm3, xmm4
676		−; psubb xmm3, xmm1
677		−; psrlw xmm3, 8
678		− pavgb xmm1, xmm3
679		−
680		− pavgb xmm0, xmm1
681		− packuswb xmm0, xmm1
682		−
683		− ; write pDst
684		− movq [r0], xmm0
685		−
686		− ; next SMB
687		− lea r2, [r2+16]
688		− lea r0, [r0+8]
689		−
690		− dec r4
691		− jg near .xloops5
692		−
693		− lea r2, [r2+2*r3] ; next end of lines
694		− lea r2, [r2+2r6] ; reset to base 0 [- 2 iDstWidth]
695		− lea r0, [r0+r1]
696		− lea r0, [r0+r6] ; reset to base 0 [- iDstWidth]
697		−
698		− dec r5
699		− jg near .yloops5
700		−
701		−%ifndef X86_32
702		− pop r12
703		−%endif
704		−
705		− POP_XMM
706		− LOAD_6_PARA_POP
707		−%ifdef X86_32
708		− pop r6
709		−%endif
710		− ret
711		−
712		−; got about 65% improvement over DyadicBilinearDownsamplerWidthx32_sse
713		−;***********************************************************************
714		−; void DyadicBilinearDownsamplerWidthx32_sse4( unsigned char* pDst, const int iDstStride,
715		−; unsigned char* pSrc, const int iSrcStride,
716		−; const int iSrcWidth, const int iSrcHeight );
717		−;***********************************************************************
718		−WELS_EXTERN DyadicBilinearDownsamplerWidthx32_sse4
719		−%ifdef X86_32
720		− push r6
721		− %assign push_num 1
722		−%else
723		− %assign push_num 0
724		−%endif
725		− LOAD_6_PARA
726		− PUSH_XMM 8
727		− SIGN_EXTENSION r1, r1d
728		− SIGN_EXTENSION r3, r3d
729		− SIGN_EXTENSION r4, r4d
730		− SIGN_EXTENSION r5, r5d
731		−
732		−%ifndef X86_32
733		− push r12
734		− mov r12, r4
735		−%endif
736		− sar r5, $01 ; iSrcHeight >> 1
737		−
738		− movdqa xmm7, [shufb_mask_low] ; mask low
739		− movdqa xmm6, [shufb_mask_high] ; mask high
740		−
741		−.yloops6:
742		−%ifdef X86_32
743		− mov r4, arg5
744		−%else
745		− mov r4, r12
746		−%endif
747		− sar r4, $01 ; iSrcWidth >> 1
748		− mov r6, r4 ; iDstWidth restored at ebx
749		− sar r4, $04 ; (iSrcWidth >> 1) / 16 ; loop count = num_of_mb
750		− neg r6 ; - (iSrcWidth >> 1)
751		− ; each loop = source bandwidth: 32 bytes
752		−.xloops6:
753		− ; 1st part horizonal loop: x16 bytes
754		− ; mem hi<- ->lo
755		− ;1st Line Src: xmm0: h H g G f F e E d D c C b B a A
756		− ; xmm1: p P o O n N m M l L k K j J i I
757		− ;2nd Line Src: xmm2: h H g G f F e E d D c C b B a A
758		− ; xmm3: p P o O n N m M l L k K j J i I
759		− ;=> target:
760		− ;: P O N M L K J I H G F E D C B A
761		− ;: p o n m l k j i h g f e d c b a
762		− ;: P .. A
763		− ;: p .. a
764		−
765		− ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
766		− movntdqa xmm0, [r2] ; 1st_src_line
767		− movntdqa xmm1, [r2+16] ; 1st_src_line + 16
768		− movntdqa xmm2, [r2+r3] ; 2nd_src_line
769		− movntdqa xmm3, [r2+r3+16] ; 2nd_src_line + 16
770		−
771		− ; packing & avg
772		− movdqa xmm4, xmm0 ; h H g G f F e E d D c C b B a A
773		− pshufb xmm0, xmm7 ; 0 H 0 G 0 F 0 E 0 D 0 C 0 B 0 A
774		− pshufb xmm4, xmm6 ; 0 h 0 g 0 f 0 e 0 d 0 c 0 b 0 a
775		−; psubb xmm4, xmm0 ; h 0 g 0 f 0 e 0 d 0 c 0 b 0 a 0
776		−; psrlw xmm4, 8 ; 0 h 0 g 0 f 0 e 0 d 0 c 0 b 0 a
777		− pavgb xmm0, xmm4
778		−
779		− movdqa xmm5, xmm1
780		− pshufb xmm1, xmm7
781		− pshufb xmm5, xmm6
782		−; psubb xmm5, xmm1
783		−; psrlw xmm5, 8
784		− pavgb xmm1, xmm5
785		−
786		− movdqa xmm4, xmm2
787		− pshufb xmm2, xmm7
788		− pshufb xmm4, xmm6
789		−; psubb xmm4, xmm2
790		−; psrlw xmm4, 8
791		− pavgb xmm2, xmm4
792		−
793		− movdqa xmm5, xmm3
794		− pshufb xmm3, xmm7
795		− pshufb xmm5, xmm6
796		−; psubb xmm5, xmm3
797		−; psrlw xmm5, 8
798		− pavgb xmm3, xmm5
799		−
800		− packuswb xmm0, xmm1
801		− packuswb xmm2, xmm3
802		− pavgb xmm0, xmm2
803		−
804		− ; write pDst
805		− movdqa [r0], xmm0
806		−
807		− ; next SMB
808		− lea r2, [r2+32]
809		− lea r0, [r0+16]
810		−
811		− dec r4
812		− jg near .xloops6
813		−
814		− lea r2, [r2+2*r3] ; next end of lines
815		− lea r2, [r2+2r6] ; reset to base 0 [- 2 iDstWidth]
816		− lea r0, [r0+r1]
817		− lea r0, [r0+r6] ; reset to base 0 [- iDstWidth]
818		−
819		− dec r5
820		− jg near .yloops6
821		−
822		−%ifndef X86_32
823		− pop r12
824		−%endif
825		−
826		− POP_XMM
827		− LOAD_6_PARA_POP
828		−%ifdef X86_32
829		− pop r6
830		−%endif
831		− ret
832		−
833		−;***********************************************************************
834		−; void DyadicBilinearDownsamplerWidthx16_sse4( unsigned char* pDst, const int iDstStride,
835		−; unsigned char* pSrc, const int iSrcStride,
836		−; const int iSrcWidth, const int iSrcHeight );
837		−;***********************************************************************
838		−WELS_EXTERN DyadicBilinearDownsamplerWidthx16_sse4
839		−%ifdef X86_32
840		− push r6
841		− %assign push_num 1
842		−%else
843		− %assign push_num 0
844		−%endif
845		− LOAD_6_PARA
846		− PUSH_XMM 6
847		− SIGN_EXTENSION r1, r1d
848		− SIGN_EXTENSION r3, r3d
849		− SIGN_EXTENSION r4, r4d
850		− SIGN_EXTENSION r5, r5d
851		−
852		−%ifndef X86_32
853		− push r12
854		− mov r12, r4
855		−%endif
856		− sar r5, $01 ; iSrcHeight >> 1
857		− movdqa xmm5, [shufb_mask_low] ; mask low
858		− movdqa xmm4, [shufb_mask_high] ; mask high
859		−
860		−.yloops7:
861		−%ifdef X86_32
862		− mov r4, arg5
863		−%else
864		− mov r4, r12
865		−%endif
866		− sar r4, $01 ; iSrcWidth >> 1
867		− mov r6, r4 ; iDstWidth restored at ebx
868		− sar r4, $03 ; (iSrcWidth >> 1) / 8 ; loop count = num_of_mb
869		− neg r6 ; - (iSrcWidth >> 1)
870		− ; each loop = source bandwidth: 16 bytes
871		−.xloops7:
872		− ; horizonal loop: x16 bytes by source
873		− ; mem hi<- ->lo
874		− ;1st line pSrc: xmm0: h H g G f F e E d D c C b B a A
875		− ;2nd line pSrc: xmm1: p P o O n N m M l L k K j J i I
876		− ;=> target:
877		− ;: H G F E D C B A, P O N M L K J I
878		− ;: h g f e d c b a, p o n m l k j i
879		−
880		− ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
881		− movntdqa xmm0, [r2] ; 1st_src_line
882		− movntdqa xmm1, [r2+r3] ; 2nd_src_line
883		−
884		− ; packing & avg
885		− movdqa xmm2, xmm0 ; h H g G f F e E d D c C b B a A
886		− pshufb xmm0, xmm5 ; 0 H 0 G 0 F 0 E 0 D 0 C 0 B 0 A
887		− pshufb xmm2, xmm4 ; 0 h 0 g 0 f 0 e 0 d 0 c 0 b 0 a
888		−; psubb xmm2, xmm0 ; h 0 g 0 f 0 e 0 d 0 c 0 b 0 a 0
889		−; psrlw xmm2, 8 ; 0 h 0 g 0 f 0 e 0 d 0 c 0 b 0 a
890		− pavgb xmm0, xmm2
891		−
892		− movdqa xmm3, xmm1
893		− pshufb xmm1, xmm5
894		− pshufb xmm3, xmm4
895		−; psubb xmm3, xmm1
896		−; psrlw xmm3, 8
897		− pavgb xmm1, xmm3
898		−
899		− pavgb xmm0, xmm1
900		− packuswb xmm0, xmm1
901		−
902		− ; write pDst
903		− movq [r0], xmm0
904		−
905		− ; next SMB
906		− lea r2, [r2+16]
907		− lea r0, [r0+8]
908		−
909		− dec r4
910		− jg near .xloops7
	595	+ movdqa xmm0, [r2+2*r4]
	596	+ pavgb xmm0, [r6+2*r4] ; avg vertical pixels
	597	+ pmaddubsw xmm0, xmm3 ; pairwise horizontal sum neighboring pixels
	598	+ pavgw xmm0, xmm2 ; (sum + 1) >> 1
	599	+ packuswb xmm0, xmm0 ; pack words to bytes
	600	+ movlps [r0+r4], xmm0 ; store results
	601	+ add r4, 8
	602	+ jl .xloops5
911	603
912	604	; next line
913	605	lea r2, [r2+2*r3] ; next end of lines
914		− lea r2, [r2+2r6] ; reset to base 0 [- 2 iDstWidth]
915	606	lea r0, [r0+r1]
916		− lea r0, [r0+r6] ; reset to base 0 [- iDstWidth]
917	607
918		− dec r5
919		− jg near .yloops7
	608	+ sub r5, 1
	609	+ jg .yloops5
920	610
921	611	%ifndef X86_32
922	612	pop r12

[Processing/x86] DyadicBilinearDownsample optimizations

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