RE: A little help needed on code optimisation to deal with delay slots

I would like to have a look please Gregory. I have already started the
port

//	MLO( x, y);
	ld %r0, [x]
	ld %r1, [y]
	mul64 %r0, %r1
	ld %r2, [%mhi]

//	MLA( x1, y1);	
	ld %r0, [x1]
	ld %r1, [y1]
	mul64 %r0, %r1	
	add %r2, [%mhi]

//	MLA( x2, y2);
	ld %r0, [x2]
	ld %r1, [y2]
	mul64 %r0, %r1	
	add %r2, [%mhi]

Into

	ld %r0, [x]
	ld %r1, [y]
	mul64 %r0, %r1
	ld %r0, [x1]
	ld %r1, [y1]
	ld %r2, [%mhi]
	mul64 %r0, %r1	
	ld %r0, [x2]
	ld %r1, [y2]
	add %r2, [%mhi]
	mul64 %r0, %r1

Saves 2 cycles per multiply, only another 8 to go

Best Regards

Julian Gardner
RSD Communications Ltd
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> -----Original Message-----
> From: Grigory A. [mailto:[email protected]] 
> Sent: Friday, July 02, 2004 2:34 AM
> To: Joolz [RSD]
> Cc: [email protected]
> Subject: Re: [mad-dev] A little help needed on code 
> optimisation to deal with delay slots
> 
> Hi Joolz!
> 
> You have BIG problem :) 10 cycles stall every mul.
> The most "multiplication consuming" functions are
> - IMDCT - actually it isn't too much
> - synthesis filter
> 
> last one has a lot of multiplication
> all other relatively free from mult operation. May be stereo 
> processing has a little.
> 
> If you have short of calculation power I can recommend you to 
> do same as I did. I've separated calculation functions and 
> implement them on asm.
> I can send the source code of of MAD with such improvements  
> that I used for
> - tms320vc55xx and
> - sp3R5 3DSP cores.
> 
> 
> --
> Best regards,
>  Grigory                            mailto:[email protected]
> 
>