Author: Robert Hyatt
Date: 06:58:35 02/21/03
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On February 21, 2003 at 03:26:35, Tom Kerrigan wrote: >On February 21, 2003 at 00:53:53, Robert Hyatt wrote: > >>On February 20, 2003 at 19:09:18, Tom Kerrigan wrote: >> >>>It seems you know a lot more than I do about instruction latencies. How do you >>>explain Crafty's disproportionate speedup on IA-64, then? And why would you >>>think Crafty's performance is a good predictor of other chess programs on IA-64 >>>when Crafty is so much different from many other programs? >> >>This ought to be obvious. IA32 requires two or more operations to do all the >>boolean stuff. IA64 requires just one. At the _same_ clock speed, that would >>be a gain of 2x by itself for all the 64 bit stuff that is done. And 64 bit >>stuff is _everywhere_. Move generation. Attack detection. Evaluation. SEE. >>you name it. And it _has_ to speed up. > >Riiight, it ought to be obvious. Thanks for making my point, Bob. > >-Tom I'm lost. That has _always_ been my point for why Crafty runs faster on 64 bit hardware (compared to 32 bit hardware) than other programs that don't need 64 bits. What am I missing?
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