Re[2]: A little help needed on code optimisation to deal with delay slots

Hi Julian!

I'll do it tomorrow. In my code there are 7 - 9 asm function which you
will have to implement "in best way for your hardware ". And decoder can work at
any hardware almost with maximum efficiency. Maybe one more to
optimize - it is Haffman decoding and freq reordering - in my case
they are still on C.
So I don't optimize just mult function, but whole calculation intensive
function. One by one :).


Friday, July 2, 2004, 7:57:06 PM, you wrote:
JR> I would like to have a look please Gregory. I have already started the
JR> port

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

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

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

JR> Into

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

JR> Saves 2 cycles per multiply, only another 8 to go

JR> Best Regards

JR> Julian Gardner
JR> 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]
>> 
>> 



-- 
Best regards,
 Grigory                            mailto:[email protected]