[RC5] Cycles per key

Jeroen v.d.burg at planet.nl
Mon Sep 30 14:24:14 EDT 2002


On 30-9-2002 at 7:41 Décio Luiz Gazzoni Filho wrote:

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>On Monday 30 September 2002 07:03, Jeroen wrote:
>> Hi
>>
>> Just curios, how many cycles does it cost to process one RC5-64 key?
>> And how much for a RC5-72 key on the moment?
>>
>>
>> Jeroen
>
>It doesn't make much sense to speak about RC5-72 speed right now, since we 
>only have a prototype core in C++, which is of course much slower than
>hand 
>optimized assembly (there is only so much a compiler can do.) We were told
>by 
>one of the assembly coders that RC5-72 can reach 90-99% RC5-64 speed once
>it 
>is optimized.

I know that :-) but i'm bored at playing diablo 2 right now and i've made some
in C with RC5-64 some time ago.
And i know how to program in assembler so i would like to give it a try.
Although i think you never hear anymore about my try since i think i won't
make it fast enough ;P

>If you want a cycles/key figure, hop over to www.distributed.net/speed,
>grab a 
>benchmarked Mkeys/sec value and the corresponding clock speed, divide
>clock 
>by benchmarked value and that's the clocks/key value corresponding to that 
>processor.

Tnx, this was what i was looking for, my cpu should do it in about 350-365 cycles.
i give it a try now :-)


Jeroen


>Décio
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