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Code Issues Releases Wiki Activity

Remove BetweenBB Array #2076

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Non functional change.
This commit is contained in:
protonspring 2019-04-04 21:45:52 -06:00 • committed by Marco Costalba
parent 8fa6273ff6
commit f98c77413b
2 changed files with 4 additions and 10 deletions
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4
src/bitboard.cpp
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@ -27,7 +27,6 @@
uint8_t PopCnt16[1 << 16];
uint8_t SquareDistance[SQUARE_NB][SQUARE_NB];
Bitboard BetweenBB[SQUARE_NB][SQUARE_NB];
Bitboard LineBB[SQUARE_NB][SQUARE_NB];
Bitboard DistanceRingBB[SQUARE_NB][8];
Bitboard PseudoAttacks[PIECE_TYPE_NB][SQUARE_NB];
@ -121,10 +120,7 @@ void Bitboards::init() {
for (PieceType pt : { BISHOP, ROOK })
for (Square s2 = SQ_A1; s2 <= SQ_H8; ++s2)
if (PseudoAttacks[pt][s1] & s2)
{
LineBB[s1][s2] = (attacks_bb(pt, s1, 0) & attacks_bb(pt, s2, 0)) | s1 | s2;
BetweenBB[s1][s2] = attacks_bb(pt, s1, square_bb(s2)) & attacks_bb(pt, s2, square_bb(s1));
}
}
}

10
src/bitboard.h
View file

@ -68,7 +68,6 @@ constexpr Bitboard Center = (FileDBB | FileEBB) & (Rank4BB | Rank5BB);
extern uint8_t PopCnt16[1 << 16];
extern uint8_t SquareDistance[SQUARE_NB][SQUARE_NB];
extern Bitboard BetweenBB[SQUARE_NB][SQUARE_NB];
extern Bitboard LineBB[SQUARE_NB][SQUARE_NB];
extern Bitboard DistanceRingBB[SQUARE_NB][8];
extern Bitboard PseudoAttacks[PIECE_TYPE_NB][SQUARE_NB];
@ -185,13 +184,12 @@ inline Bitboard adjacent_files_bb(File f) {
}
/// between_bb() returns a bitboard representing all the squares between the two
/// given ones. For instance, between_bb(SQ_C4, SQ_F7) returns a bitboard with
/// the bits for square d5 and e6 set. If s1 and s2 are not on the same rank,
/// file or diagonal, 0 is returned.
/// between_bb() returns squares that are linearly between the given squares
/// If the given squares are not on a same file/rank/diagonal, return 0.
inline Bitboard between_bb(Square s1, Square s2) {
return BetweenBB[s1][s2];
return LineBB[s1][s2] & ( (AllSquares << (s1 + (s1 < s2)))
^(AllSquares << (s2 + !(s1 < s2))));
}