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Code Issues Releases Wiki Activity

Change initialization of some bitboards

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No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-03-08 14:38:17 +01:00
parent c980163316
commit a617b03875
2 changed files with 36 additions and 52 deletions
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76
src/bitboard.cpp
View file

@ -156,51 +156,6 @@ const int RShift[64] = {
#endif // defined(IS_64BIT)
static const Bitboard DarkSquaresBB = 0xAA55AA55AA55AA55ULL;
const Bitboard SquaresByColorBB[2] = { DarkSquaresBB, ~DarkSquaresBB };
const Bitboard FileBB[8] = {
FileABB, FileBBB, FileCBB, FileDBB, FileEBB, FileFBB, FileGBB, FileHBB
};
const Bitboard NeighboringFilesBB[8] = {
FileBBB, FileABB|FileCBB, FileBBB|FileDBB, FileCBB|FileEBB,
FileDBB|FileFBB, FileEBB|FileGBB, FileFBB|FileHBB, FileGBB
};
const Bitboard ThisAndNeighboringFilesBB[8] = {
FileABB|FileBBB, FileABB|FileBBB|FileCBB,
FileBBB|FileCBB|FileDBB, FileCBB|FileDBB|FileEBB,
FileDBB|FileEBB|FileFBB, FileEBB|FileFBB|FileGBB,
FileFBB|FileGBB|FileHBB, FileGBB|FileHBB
};
const Bitboard RankBB[8] = {
Rank1BB, Rank2BB, Rank3BB, Rank4BB, Rank5BB, Rank6BB, Rank7BB, Rank8BB
};
const Bitboard InFrontBB[2][8] = {
{ Rank2BB | Rank3BB | Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
Rank3BB | Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
Rank5BB | Rank6BB | Rank7BB | Rank8BB,
Rank6BB | Rank7BB | Rank8BB,
Rank7BB | Rank8BB,
Rank8BB,
EmptyBoardBB
},
{ EmptyBoardBB,
Rank1BB,
Rank2BB | Rank1BB,
Rank3BB | Rank2BB | Rank1BB,
Rank4BB | Rank3BB | Rank2BB | Rank1BB,
Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB,
Rank6BB | Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB,
Rank7BB | Rank6BB | Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB
}
};
// Global bitboards definitions with static storage duration are
// automatically set to zero before enter main().
Bitboard RMask[64];
@ -214,9 +169,14 @@ Bitboard BAttacks[0x1480];
Bitboard SetMaskBB[65];
Bitboard ClearMaskBB[65];
Bitboard SquaresByColorBB[2];
Bitboard FileBB[8];
Bitboard RankBB[8];
Bitboard NeighboringFilesBB[8];
Bitboard ThisAndNeighboringFilesBB[8];
Bitboard InFrontBB[2][8];
Bitboard NonSlidingAttacksBB[16][64];
Bitboard BetweenBB[64][64];
Bitboard SquaresInFrontMask[2][64];
Bitboard PassedPawnMask[2][64];
Bitboard AttackSpanMask[2][64];
@ -363,6 +323,30 @@ namespace {
void init_masks() {
SquaresByColorBB[DARK] = 0xAA55AA55AA55AA55ULL;
SquaresByColorBB[LIGHT] = ~SquaresByColorBB[DARK];
FileBB[FILE_A] = FileABB;
RankBB[RANK_1] = Rank1BB;
for (File f = FILE_B; f <= FILE_H; f++)
{
FileBB[f] = FileBB[f - 1] << 1;
RankBB[f] = RankBB[f - 1] << 8;
}
for (File f = FILE_A; f <= FILE_H; f++)
{
NeighboringFilesBB[f] = (f > FILE_A ? FileBB[f - 1] : 0) | (f < FILE_H ? FileBB[f + 1] : 0);
ThisAndNeighboringFilesBB[f] = FileBB[f] | NeighboringFilesBB[f];
}
for (Rank rw = RANK_7, rb = RANK_1; rw >= RANK_1; rw--, rb++)
{
InFrontBB[WHITE][rw] = InFrontBB[WHITE][rw + 1] | RankBB[rw + 1];
InFrontBB[BLACK][rb] = InFrontBB[BLACK][rb - 1] | RankBB[rb - 1];
}
SetMaskBB[SQ_NONE] = EmptyBoardBB;
ClearMaskBB[SQ_NONE] = ~SetMaskBB[SQ_NONE];

12
src/bitboard.h
View file

@ -43,12 +43,12 @@ const Bitboard Rank6BB = Rank1BB << (8 * 5);
const Bitboard Rank7BB = Rank1BB << (8 * 6);
const Bitboard Rank8BB = Rank1BB << (8 * 7);
extern const Bitboard SquaresByColorBB[2];
extern const Bitboard FileBB[8];
extern const Bitboard NeighboringFilesBB[8];
extern const Bitboard ThisAndNeighboringFilesBB[8];
extern const Bitboard RankBB[8];
extern const Bitboard InFrontBB[2][8];
extern Bitboard SquaresByColorBB[2];
extern Bitboard FileBB[8];
extern Bitboard NeighboringFilesBB[8];
extern Bitboard ThisAndNeighboringFilesBB[8];
extern Bitboard RankBB[8];
extern Bitboard InFrontBB[2][8];
extern Bitboard SetMaskBB[65];
extern Bitboard ClearMaskBB[65];