Author: Uri Blass
Date: 14:23:05 09/05/03
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On September 05, 2003 at 17:08:43, Robert Hyatt wrote: >On September 05, 2003 at 16:17:48, Uri Blass wrote: > >>I want to have some rule when it is a good idea to use local varaibles. >> >>I believe that it is clear that when instead of changing the hash key zob[hply] >>many times in my makemove it is better to start using local varaible and start >>my makemove with >> __int64 zob=zobkey[hply]; >>and finish it with when hply was already increased by 1 with >>zobkey[hply]=zob; >> >>My question is how many times using the same expression zobkey[hply] >>justify using local varaible > >I don't see any benefit to doing what you are doing. IE >zobkey[hply+1]=zobkey[hply]; will make the copy. The only thing you save >is the indexing operation needed to access zobkey[hply+1] as you modify it. >But a good compiler will probably be able to optimize that into a register >anyway if you make sure that you copy and update it as quickly as possible >before doing anything else... I do not see how I do it without loss of speed because of other reasons. part of the update that I do are only in case of capture or only in case of castling and if I update it in the beginning without changing more information then I may have the same if twice. I will need to check if the move is a capture one time for updating the hash key and one time for updating the board. Uri
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