[RC5] AMD X86-64 port

Jeroen v.d.burg at planet.nl
Sun Apr 27 21:58:38 EDT 2003


What I know about RC5 and about OGR i think OGR would gain a bigger speed increase than RC5 when going from 32 to 64 bits.
So... anybody started a new OGR core already? ;-)

*********** REPLY SEPARATOR  ***********

On 27-4-2003 at 14:35 Scott Dodson wrote:

>On Sun, 2003-04-27 at 14:13, Karl wrote:
>> > One of the core guys (Acidblood) is raving about the new chip.  I'm
>> > pretty sure he thinks it's the best thing since sliced bread.  So
>> > there's definitely interest internally.
>> >
>>
>> I'm most interested to see what those extra registers in 64-bit mode can
>do
>> for RC5-72 performance.
>
>Acidblood has said that the simple fact of being 64-bit won't help, and
>I think he even said it would harm it.  The operations of rc5 are
>particularly friendly to 32bit processors, I believe he mentioned the
>modulo operations work really well on 32bit processors.  But of course,
>if the new Opteron is overall a faster processor, it should surely go
>faster.  The fact that it runs 32bit code pretty well should be
>interesting too.
>
>--
>Scott
>sdodson at distributed.net
>sdodson at eagle4.cc.gasou.edu
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