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Decrypt some magics in bitboards definitions

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No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-08-25 14:13:05 +02:00
parent eb4858256b
commit b196af4dcd
1 changed files with 17 additions and 17 deletions
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34
src/bitboard.h
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@ -36,25 +36,25 @@
//// Constants and variables //// Constants and variables
//// ////
const Bitboard EmptyBoardBB = 0ULL; const Bitboard EmptyBoardBB = 0;
const Bitboard FileABB = 0x0101010101010101ULL; const Bitboard FileABB = 0x0101010101010101;
const Bitboard FileBBB = 0x0202020202020202ULL; const Bitboard FileBBB = FileABB << 1;
const Bitboard FileCBB = 0x0404040404040404ULL; const Bitboard FileCBB = FileABB << 2;
const Bitboard FileDBB = 0x0808080808080808ULL; const Bitboard FileDBB = FileABB << 3;
const Bitboard FileEBB = 0x1010101010101010ULL; const Bitboard FileEBB = FileABB << 4;
const Bitboard FileFBB = 0x2020202020202020ULL; const Bitboard FileFBB = FileABB << 5;
const Bitboard FileGBB = 0x4040404040404040ULL; const Bitboard FileGBB = FileABB << 6;
const Bitboard FileHBB = 0x8080808080808080ULL; const Bitboard FileHBB = FileABB << 7;
const Bitboard Rank1BB = 0xFFULL; const Bitboard Rank1BB = 0xFF;
const Bitboard Rank2BB = 0xFF00ULL; const Bitboard Rank2BB = Rank1BB << (8 * 1);
const Bitboard Rank3BB = 0xFF0000ULL; const Bitboard Rank3BB = Rank1BB << (8 * 2);
const Bitboard Rank4BB = 0xFF000000ULL; const Bitboard Rank4BB = Rank1BB << (8 * 3);
const Bitboard Rank5BB = 0xFF00000000ULL; const Bitboard Rank5BB = Rank1BB << (8 * 4);
const Bitboard Rank6BB = 0xFF0000000000ULL; const Bitboard Rank6BB = Rank1BB << (8 * 5);
const Bitboard Rank7BB = 0xFF000000000000ULL; const Bitboard Rank7BB = Rank1BB << (8 * 6);
const Bitboard Rank8BB = 0xFF00000000000000ULL; const Bitboard Rank8BB = Rank1BB << (8 * 7);
extern const Bitboard SquaresByColorBB[2]; extern const Bitboard SquaresByColorBB[2];
extern const Bitboard FileBB[8]; extern const Bitboard FileBB[8];