Author: Robert Hyatt
Date: 08:03:46 07/20/04
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On July 20, 2004 at 08:19:25, Andrew Wagner wrote: >Being the great genius that I am, it dawned on me the other day that creating a >custom class to handle things like moves, which can be stored easily in >integers, was not terribly efficient. So, let's say, for example, I'm storing >the 'to' square for a move in the right-most (least-significant) 7 bits of an >integer, the 'from' square in the next 7 least significant bits, and possibly >other information in other (more significant) bits. What's the most efficient >way to knock off extra, more significant bits? I want to do something like this: >to = move MOD 128; >from = (move>>7) MOD 128; > >...but not sure if that's most efficient. Thanks! Andrew I doubt you can beat these: #define From(x) (x & 127) #define To(x) ((x >> 7) & 127) etc...
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