Author: Mathieu Pagé
Date: 10:11:43 12/06/05
Go up one level in this thread
On December 06, 2005 at 13:06:01, Zappa wrote:
>On December 06, 2005 at 12:43:24, Mathieu Pagé wrote:
>
>>On December 05, 2005 at 23:24:52, Zappa wrote:
>>
>>>I am getting really, really tired of coding all my evaluation twice (once for
>>>white and once for black). However, one of the things that is keeping me from
>>>switching to a for(i < 2) loop is that I can't do a shift!
>>>
>>>For example, if I have some pattern based on (pawns << 8) for white, than that
>>>is (pawns >> 8) for black, and you can't do a negative shift in IA32.
>>
>>Hi,
>>
>>I never tested the idea i'm about to propose, I just thought of it while reading
>>your post, but it seem to make sense for me. This require that you code in C++,
>>I don't know if it's the case.
>>
>>In every cases i'd like to have somes opinions from you guys.
>>
>>here is a sample function :
>>
>>template <int color>
>>void eval()
>>{
>> // do some stuff
>>
>> if (color == white)
>> {
>> result = pawns >> 8;
>> }
>> else
>> {
>> result = pawns << 8;
>> }
>>
>> // do some stuff with result
>>
>> return;
>>}
>>
>>Then you can cal your evaluation function like this
>>
>>if (colorToMove == white)
>>{
>> x = eval<WHITE>();
>>}
>>else
>>{
>> x = eval<BLACK>();
>>}
>>
>>This way you can write only one evaluation function with IFs where the code is
>>different for the whites and blacks, but since the color is passed as a template
>>parameter, the conditional jump are resolved at the link time (resulting in two
>>function being compiled) causing no overhead.
>>
>>What do you think of this idea ?
>>
>>Mathieu
>
>Yes, but I have to write it twice :) That is my problem.
>
>anthony
Hi Anthony,
Sure you have to write some parts twice, but I think that the most part of your
function(s) will be the same, only a small proportions of the evaluation
function will be in a if-else statement.
I must admit, my solution is only partial.
Mathieu
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.