[rc5] RISC sppedups

Remi Guyomarch rguyom at mail.dotcom.fr
Thu Jul 17 21:23:50 EDT 1997


Joshua Weage wrote:
> 
> > > > What about the RISC stuff?
> >
> > > Distributed.net has already done some work on these ideas, and their
> > > two keys C version is pretty much the same as mine.  In fact their
> > > version seems to be slightly better, but I think it could be
> > > improved...
> >
> > Then why is your code 35% faster than 2.002 on R10Ks and Ultras?
> 
>         I switched from v1 to his code on the Ultra's
> I am running, went from 166K to 220K/sec.  I was quite
> impressed, although with deschal each of those machines was
> running something like 4 million keys/sec.

Yes, with the bitslice version of DESCHALL client, Sparcs are really
fast ! But when it comes to RC5, the lack of a rotate instruction is
fatal.
And it's not obvious to find a use for 64 bits registers in RC5. (Well,
I should perhaps read some papers on it...)

-- 
Rémi
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