Author: Robert Hyatt
Date: 17:07:51 11/21/02
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On November 20, 2002 at 12:42:21, David Hanley wrote: >I just talked to the boys from CRAY ( i'm ay supercomputing now ). > >We got to talking about bit operations. They say that can count set or unset >bits in a 64 bit number in one instruction, and also fin leftmost one, zero, >etc. > >Memory bandwidth is also 50gb+ for a chip. > >I kept wondering how fast crafty would run on there... ;) > >dave It runs well there, as did Cray Blitz. We used that stuff a lot (counting bits and finding bits) even though we were not full bitboard back then. Crafty has code for a Cray to use the specific bit stuff, including a special instruction to generate bit masks...
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