Author: Russell Reagan
Date: 16:29:09 11/06/03
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On November 06, 2003 at 17:04:11, Gerd Isenberg wrote: >hmm, a few aspects: are the Athlons you compare really equal? >Let's see how other programs will perform. Sjeng may profit more from opteron >features independent from 64-bit stuff, e.g. bigger cache, more registers and >therefore less store/loads of locals and function parameters, faster memory and >smarter branch prediction. And 64-bit bsf is still expensive vector path >instruction with 9 cycles latency where all other pipes are blocked. Hi Gerd, Have you had a chance to test out your KoggeStone stuff on an Opteron yet? One thing I still wonder about KoggeStone is if it will be faster than rotated bitboards on 64-bit hardware. You have said in the past that your KoggeStone stuff was faster than your rotated bitboards on 32-bit hardware, but you also used the 64-bit MMX registers. Surely your KoggeStone stuff will be faster on an Opteron by some amount, but it seems like it won't get as much of an improvement since you are already using the 64-bit MMX registers while those who are using rotated bitboards are still using 32-bit registers on 32-bit machines.
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