Author: Mathieu Pagé
Date: 09:43:24 12/06/05
Go up one level in this thread
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
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