Computer Chess Club Archives




Subject: Re: Hash Collisions

Author: Robert Hyatt

Date: 08:09:40 02/23/99

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On February 23, 1999 at 04:58:30, Dave Gomboc wrote:

>On February 22, 1999 at 11:14:14, Robert Hyatt wrote:
>>I'll try to figure out a way to post my values here if you are interested.
>>64 * 12 isn't horribly big, but when you display them as 64 bit values, they
>>are big. The main issue is how to initialize such an array in a portable
>>way...  IE (BITBOARD ran[12][64] = {{1,2,3},{4,5,6}};  The numbers 1,2,3
>>default to 'int' which is bad.  I don't know what to do for all compilers
>>(IE 123ULL or (BITBOARD) 123)
>I don't know of a portable way to do this either.  My Rush Hour
>( software has "#if defined"s like crazy for all of the annoying
>cases, e.g.

Cute bit of trivia.  Look on the outside of the Rush Hour box, and check
out the names.  One of them dates back to Cray Blitz.  But I won't spoil
the mystery just yet.


>/* MSVC 6.0 */
>typedef unsigned __int64 bitboard;
>const bitboard outside_edge = 0xFF818181818181FF;
>/* SGI MIPSpro 7.2.1 (with -64 switch) */
>typedef unsigned long bitboard;
>const bitboard outside_edge = 0xFF818181818181FF;
>/* g++ 2.7.2 */
>typedef unsigned long long bitboard;
>const bitboard outside_edge = 0xFF818181818181FFll;
>Of the three, I like SGI's setup the best.
>Dave Gomboc

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