Author: Alessandro Damiani
Date: 11:16:08 01/06/03
Go up one level in this thread
[snip] >>Thanks for the info! >> >>Since some time I favoured the Athlon to the P4, but now I am disappointed. It >>seems that the next PC I will buy will be a 64 machine....when it will be cheap >>enough. *sigh* >> >>BTW do you know why AMD didn't improve their bsf/bsr to get near Intel's? >> >>Alessandro > >I don't think the Pentium 4 has the 2-cycle bsr/bsf instruction. They don't list >it in the timing tables, so I'm not sure what the timing is. Likely they use a >binary search like AMD does because it has uniform search time and performs >relatively well. When they ramp the clock speed, those 8 cycles become cheaper >and cheaper... :-) > >AMD did improve bsf/bsr from the K6, just not to 2-cycles. Making bsf/bsr >extremely efficient isn't that useful because most applications can't use the >instructions. That space/complexity is much better spent on things that benefit >most applications which in turn will benefit Chess, too. AMD's decision makes a >good tradeoff unless you want to build an ASIC for Chess. > You are right. >BTW, since the K8 is really just a 64-bit K7, it should be in the same price >range. > >-Matt Thanks Matt! The PC-future looks bright. Alessandro
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