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Rewrite some bitboard init code

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And move the static function Position::attacks_from() to
bitboard code renaming it attacks_bb()

No functional change.
This commit is contained in:
Marco Costalba
2013-11-30 10:27:23 +01:00
parent 6ea5dc294c
commit 034a2b04f2
5 changed files with 27 additions and 36 deletions
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27
src/bitboard.cpp
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@@ -212,24 +212,23 @@ void Bitboards::init() {
init_magics(RTable, RAttacks, RMagics, RMasks, RShifts, RDeltas, magic_index<ROOK>);
init_magics(BTable, BAttacks, BMagics, BMasks, BShifts, BDeltas, magic_index<BISHOP>);
for (Square s = SQ_A1; s <= SQ_H8; ++s)
{
PseudoAttacks[QUEEN][s] = PseudoAttacks[BISHOP][s] = attacks_bb<BISHOP>(s, 0);
PseudoAttacks[QUEEN][s] |= PseudoAttacks[ ROOK][s] = attacks_bb< ROOK>(s, 0);
}
for (Square s1 = SQ_A1; s1 <= SQ_H8; ++s1)
{
PseudoAttacks[QUEEN][s1] = PseudoAttacks[BISHOP][s1] = attacks_bb<BISHOP>(s1, 0);
PseudoAttacks[QUEEN][s1] |= PseudoAttacks[ ROOK][s1] = attacks_bb< ROOK>(s1, 0);
for (Square s2 = SQ_A1; s2 <= SQ_H8; ++s2)
if (PseudoAttacks[QUEEN][s1] & s2)
{
Square delta = (s2 - s1) / square_distance(s1, s2);
{
Piece pc = (PseudoAttacks[BISHOP][s1] & s2) ? W_BISHOP :
(PseudoAttacks[ROOK][s1] & s2) ? W_ROOK : NO_PIECE;
for (Square s = s1 + delta; s != s2; s += delta)
BetweenBB[s1][s2] |= s;
if (pc == NO_PIECE)
continue;
PieceType pt = (PseudoAttacks[BISHOP][s1] & s2) ? BISHOP : ROOK;
LineBB[s1][s2] = (PseudoAttacks[pt][s1] & PseudoAttacks[pt][s2]) | s1 | s2;
}
LineBB[s1][s2] = (attacks_bb(pc, s1, 0) & attacks_bb(pc, s2, 0)) | s1 | s2;
BetweenBB[s1][s2] = attacks_bb(pc, s1, SquareBB[s2]) & attacks_bb(pc, s2, SquareBB[s1]);
}
}
}