[RC5] Performance on P-IV

James Sharp jsharp at psychoses.org
Thu May 10 18:18:55 EDT 2001


> The G4 is by far the most efficient processor out there for RC5 right now in
> terms of keys/clock. This is a result of the AltiVec-optimized code. I'm not
> close enough to the dnet P4 project to know, but who knows what some great
> coder could make of the P4's updated SIMD architecture?

How exactly does the G4/AltiVec code work?  RC5 isn't truly vectorizable,
because of inter-loop dependencies.  Does the dnet stuff break it down
into parallel tasks using the vector registers each as a separate
pseudo-processor?


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