Author: Bruce Moreland
Date: 13:08:05 04/16/03
Go up one level in this thread
On April 16, 2003 at 05:34:02, Uri Blass wrote: >better to give only part of the chars that are used in the function? > >The problem is that my makemove get a struct of 4 chars >with details about the move(maybe it is better to use one integer and to get rid >of the 4 chars but I decided that it is a big change that I do not like to do >now). > >I call from makemove to functions that get part of the chars >for example > >updateblackpiece(m.from,m.to); > >The question is if it is better to call only m and not the 2 varaibles >m.to and m.from > > >there is already a union that include these numbers so I assume >that they they are in memory. > >I also plan to write a function that update some varaibles and >I need only m.from,m.to,m.bits and I do not need m.promote and >the question is if using m is better than using 3 of the >4 varaibles. > >Another solution is to have a global structure of 4 chars for the move that >the program consider and to update it every time that I make a move in the >beginning of makemove so I do not need to give parameters to the functions >that movei call. > >Note that my undomove does not get a move as a varaible and >I start it by > >move_bytes m=hist_dat[hply-1].m.b; > >I update >hist_dat[hply].m.b in my make move but it is clear that it is not >a good idea to use this global array to get the numbers and maybe it is better >to have m as global varaible so I can use it in every function. > > >What is the best solution? > >I do not see difference in readibility if I give m to a function >or give 2 chars to the same function and I want to know a clear rule what is >faster not by try and error. > >Uri You gotta test it. You are probably sign-extending all over the place, which used to be very nasty-bad, and still might be, but on the other hand, you have a little less memory bandwidth. If you are serious, you will try it both ways. Be a man. bruce
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