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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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src/position.cpp
+1 -18
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@@ -455,23 +455,6 @@ Bitboard Position::attackers_to(Square s, Bitboard occ) const {
}
/// Position::attacks_from() computes a bitboard of all attacks of a given piece
/// put in a given square. Slider attacks use occ bitboard as occupancy.
Bitboard Position::attacks_from(Piece p, Square s, Bitboard occ) {
assert(is_ok(s));
switch (type_of(p))
{
case BISHOP: return attacks_bb<BISHOP>(s, occ);
case ROOK : return attacks_bb<ROOK>(s, occ);
case QUEEN : return attacks_bb<BISHOP>(s, occ) | attacks_bb<ROOK>(s, occ);
default : return StepAttacksBB[p][s];
}
}
/// Position::legal() tests whether a pseudo-legal move is legal
bool Position::legal(Move m, Bitboard pinned) const {
@@ -672,7 +655,7 @@ bool Position::gives_check(Move m, const CheckInfo& ci) const {
switch (type_of(m))
{
case PROMOTION:
return attacks_from(Piece(promotion_type(m)), to, pieces() ^ from) & ksq;
return attacks_bb(Piece(promotion_type(m)), to, pieces() ^ from) & ksq;
// En passant capture with check ? We have already handled the case
// of direct checks and ordinary discovered check, the only case we