Author: Pat King
Date: 12:18:32 02/23/01
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On February 22, 2001 at 15:46:20, Dann Corbit wrote: >On February 22, 2001 at 09:28:24, Pat King wrote: > >>On February 21, 2001 at 12:34:49, Jon Dart wrote: >> >>> >>>I predict that you find using piece declared as a class causes a significant >>>performance penalty. >> >>LOL that one doesn't take the psychic ability of the Great Kreskin. >> >>> You will wind up creating a lot of such objects. If created >>>on the heap, you will have the overehad of malloc() plus the cost of calling >>>your object constructor once per instance. >> >>I create exactly 32 objects at startup. I don't destroy and rebuild with >>captures and unmoves. So your point is true, but irrelavant. >> >>>Furthermore virtual functions are >>>slower to call than regular functions, due to the extra indirection. >>> >>True, but for my humble program worth the decrease in complexity. I've come a >>lot farther with Z2k than with the previous versions of Zotron, and I believe >>it's do to the OO approach and the elimination of as many "if" and "switch" >>statements as possible. >> >>>In my opinion, backed by experience, you'd be better off using a primitive >>>type such as "int" for piece values. Not as elegant perhaps but speed >>>counts in a chess program. >> >>Getting it working counts more. Zotron will admittedly never be as fast as a C >>program, but I never planned for it to be a world beater. It's just something >>for me to tinker with. > >A well crafted C++ program can perform as well as C or even Assembly. Just ask >Amir Ban or look at Junior's ability. While tortuous hours spent tweaking >assembly in some inner loop may yield a small payoff (and from time to time it >is worthwhile to do so) for the most part, clarity of expression will result in >bug free code which is far more important than many people realize. > >Some language choices will be a clear handicap (e.g. BASIC). But for the most >part, the algorithm implementations will dominate the performance. Preaching to the choir, brother. But you can't convert the heathens in one fell swoop ;) Pat
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