Author: Robert Hyatt
Date: 16:41:46 05/09/04
Go up one level in this thread
On May 09, 2004 at 17:27:48, Uri Blass wrote:
>On May 09, 2004 at 15:06:30, Uri Blass wrote:
>
>>I see that crafty is using the following commands:
>>
>>if (buffered >= SORT_BLOCK) {
>> BookSort(bbuffer,buffered,++files)
>>
>>If I understand correctly the book of crafty is not one file but some files,
>>when every file is not more that SORT_BLOCK positions.
>>
>>I wonder what is the reason for it.
>>I think that it is more simple to call booksort only one time, after I read all
>>the book positions into an array.
>>
>>The only problem can be if the book is too big so there is not enough memory in
>>RAM, but I think that it is not a practical problem with the hardware that you
>>have.
>>
>>Do you do it in order to support users with inferior hardware or to support
>>bigger books (that you practically not need for better results), or is there
>>another reason for it?
>>
>>Uri
>
>Another question that I have is if I can use the bookupcompare function from
>Crafty(see the bottom of this post).
>
>I do not like to copy and paste code from other programs but I do not see a
>different way to compare between positions and the only difference may be that I
>may have different structure relative to the BB_POSITION structure.
>
>I do not understand the
>"#if defined(NT_i386)" that I do not post here and I guess that this is for
>different hardware or different system like linux and I do not like to care
>about running on different system.
>
>int BookUpCompare(const void *pos1, const void *pos2) {
> static BITBOARD p1, p2;
> memcpy((char*)&p1,((BB_POSITION *)pos1)->position,8);
> memcpy((char*)&p2,((BB_POSITION *)pos2)->position,8);
> if (p1 < p2) return(-1);
> if (p1 > p2) return(+1);
> return(0);
>}
>
>Uri
Feel free. That is not exactly a unique-to-crafty piece of code... IE I wrote
it, but it is not something that makes Crafty "crafty"... any more than the
various other common functions like PopCnt() and the like...
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