Author: Bo Persson
Date: 11:47:03 08/02/04
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On August 02, 2004 at 04:39:31, Uri Blass wrote: > >I do not understand much about speed optimizations. > >I do not care about doing the program as fast as possible and I only care not to >do it slower because of classes. Why do you think it would be slower? > >This is the reason that I prefer varaibles that are not used often in classes. Variables that are not used often doesn't matter at all. >varaibles that are used often also may mean more changes to the code in order >not to have them as global varaibles in case that they are used in many places >of the code. > >I use hply not only in makemove but also in the code that check repetition and >sometimes in the search code when I want to look at the history to decide about >extensions so replacing this global varaible by something else does not seems to >me very simple. > >You are probably right that putting hply in another class is only a negligible >overhead but the problem is not only speed Gerd's point was actually that you can *gain* speed by using classes! :-) Code that accesses global variables will have to carry the address of the variable in the instructions. That makes the code larger, and potentially slower. Code that accesses several members of a class, will probably load the 'this' pointer in a register once, and then reuse that address in several instructions. This often makes the resulting code smaller, and faster. I have seen this happen several times. >hply is only one global varaible and I have a lot of other global varaibles and >arrays. What if *that* is the problem and not the cure? Bo Persson
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