[RC5] G4 benchmarks

Dan Oetting oetting at gldmutt.cr.usgs.gov
Fri Oct 29 11:09:12 EDT 1999

>On Thu, 28 Oct 1999 13:26:26 -0400, Joe Kazura wrote:
>>The code needs to be updated on RC5 to be 128-bit and to use the
>>Altivec instruction set.
>>The current BETA client of RC5 gives about the same for a G4 @ 450Mhz
>>as it does for a G3 @ 450 Mhz.
>that sounds nice, except rc5 is a purely 32 bit algorithm, so going 64 or
>128 bits
>does not help ( it uses lots of 32 bit rotates),

It is nice since AltiVec can treat those 128 bits as 4 32 bit operands to
do 32 bit dynamic rotates and 32 bit adds on 4 words at a time.

>and the cores are available at http://www.distributed.net/source/ for
>anyone who
>wants to try and create a Altivec core

-- Dan Oetting <oetting at ghtmail.cr.usgs.gov>

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