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Code Issues Releases Wiki Activity

Retire CheckInfo

Browse source 
Move its content directly under StateInfo.

Verified for no speed regression.

No functional change.
This commit is contained in:
Marco Costalba 2016-08-27 10:05:42 +02:00
parent 0b944c7186
commit 1ee2838214
4 changed files with 33 additions and 42 deletions
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4
src/movegen.cpp
View file

@ -238,7 +238,7 @@ namespace {
if (Checks)
{
if ( (Pt == BISHOP || Pt == ROOK || Pt == QUEEN)
&& !(PseudoAttacks[Pt][from] & target & pos.check_info().checkSquares[Pt]))
&& !(PseudoAttacks[Pt][from] & target & pos.check_squares(Pt)))
continue;
if (pos.discovered_check_candidates() & from)
@ -248,7 +248,7 @@ namespace {
Bitboard b = pos.attacks_from<Pt>(from) & target;
if (Checks)
b &= pos.check_info().checkSquares[Pt];
b &= pos.check_squares(Pt);
while (b)
*moveList++ = make_move(from, pop_lsb(&b));

42
src/position.cpp
View file

@ -294,19 +294,19 @@ void Position::set_castling_right(Color c, Square rfrom) {
/// Position::set_check_info() sets king attacks to detect if a move gives check
void Position::set_check_info(CheckInfo* ci) const {
void Position::set_check_info(StateInfo* si) const {
ci->blockersForKing[WHITE] = slider_blockers(pieces(BLACK), square<KING>(WHITE));
ci->blockersForKing[BLACK] = slider_blockers(pieces(WHITE), square<KING>(BLACK));
si->blockersForKing[WHITE] = slider_blockers(pieces(BLACK), square<KING>(WHITE));
si->blockersForKing[BLACK] = slider_blockers(pieces(WHITE), square<KING>(BLACK));
Square ksq = ci->ksq = square<KING>(~sideToMove);
Square ksq = square<KING>(~sideToMove);
ci->checkSquares[PAWN] = attacks_from<PAWN>(ksq, ~sideToMove);
ci->checkSquares[KNIGHT] = attacks_from<KNIGHT>(ksq);
ci->checkSquares[BISHOP] = attacks_from<BISHOP>(ksq);
ci->checkSquares[ROOK] = attacks_from<ROOK>(ksq);
ci->checkSquares[QUEEN] = ci->checkSquares[BISHOP] | ci->checkSquares[ROOK];
ci->checkSquares[KING] = 0;
si->checkSquares[PAWN] = attacks_from<PAWN>(ksq, ~sideToMove);
si->checkSquares[KNIGHT] = attacks_from<KNIGHT>(ksq);
si->checkSquares[BISHOP] = attacks_from<BISHOP>(ksq);
si->checkSquares[ROOK] = attacks_from<ROOK>(ksq);
si->checkSquares[QUEEN] = si->checkSquares[BISHOP] | si->checkSquares[ROOK];
si->checkSquares[KING] = 0;
}
@ -322,7 +322,7 @@ void Position::set_state(StateInfo* si) const {
si->psq = SCORE_ZERO;
si->checkersBB = attackers_to(square<KING>(sideToMove)) & pieces(~sideToMove);
set_check_info(&si->ci);
set_check_info(si);
for (Bitboard b = pieces(); b; )
{
@ -587,12 +587,12 @@ bool Position::gives_check(Move m) const {
Square to = to_sq(m);
// Is there a direct check?
if (st->ci.checkSquares[type_of(piece_on(from))] & to)
if (st->checkSquares[type_of(piece_on(from))] & to)
return true;
// Is there a discovered check?
if ( (discovered_check_candidates() & from)
&& !aligned(from, to, st->ci.ksq))
&& !aligned(from, to, square<KING>(~sideToMove)))
return true;
switch (type_of(m))
@ -601,7 +601,7 @@ bool Position::gives_check(Move m) const {
return false;
case PROMOTION:
return attacks_bb(Piece(promotion_type(m)), to, pieces() ^ from) & st->ci.ksq;
return attacks_bb(Piece(promotion_type(m)), to, pieces() ^ from) & square<KING>(~sideToMove);
// En passant capture with check? We have already handled the case
// of direct checks and ordinary discovered check, so the only case we
@ -612,8 +612,8 @@ bool Position::gives_check(Move m) const {
Square capsq = make_square(file_of(to), rank_of(from));
Bitboard b = (pieces() ^ from ^ capsq) | to;
return (attacks_bb< ROOK>(st->ci.ksq, b) & pieces(sideToMove, QUEEN, ROOK))
| (attacks_bb<BISHOP>(st->ci.ksq, b) & pieces(sideToMove, QUEEN, BISHOP));
return (attacks_bb< ROOK>(square<KING>(~sideToMove), b) & pieces(sideToMove, QUEEN, ROOK))
| (attacks_bb<BISHOP>(square<KING>(~sideToMove), b) & pieces(sideToMove, QUEEN, BISHOP));
}
case CASTLING:
{
@ -622,8 +622,8 @@ bool Position::gives_check(Move m) const {
Square kto = relative_square(sideToMove, rfrom > kfrom ? SQ_G1 : SQ_C1);
Square rto = relative_square(sideToMove, rfrom > kfrom ? SQ_F1 : SQ_D1);
return (PseudoAttacks[ROOK][rto] & st->ci.ksq)
&& (attacks_bb<ROOK>(rto, (pieces() ^ kfrom ^ rfrom) | rto | kto) & st->ci.ksq);
return (PseudoAttacks[ROOK][rto] & square<KING>(~sideToMove))
&& (attacks_bb<ROOK>(rto, (pieces() ^ kfrom ^ rfrom) | rto | kto) & square<KING>(~sideToMove));
}
default:
assert(false);
@ -799,8 +799,8 @@ void Position::do_move(Move m, StateInfo& newSt, bool givesCheck) {
sideToMove = ~sideToMove;
// Update CheckInfo
set_check_info(&st->ci);
// Update king attacks used for fast check detection
set_check_info(st);
assert(pos_is_ok());
}
@ -915,7 +915,7 @@ void Position::do_null_move(StateInfo& newSt) {
sideToMove = ~sideToMove;
set_check_info(&st->ci);
set_check_info(st);
assert(pos_is_ok());
}

25
src/position.h
View file

@ -42,16 +42,6 @@ namespace PSQT {
}
/// CheckInfo struct keeps info used to detect if a move gives check
struct CheckInfo {
Bitboard blockersForKing[COLOR_NB];
Bitboard checkSquares[PIECE_TYPE_NB];
Square ksq;
};
/// StateInfo struct stores information needed to restore a Position object to
/// its previous state when we retract a move. Whenever a move is made on the
/// board (by calling Position::do_move), a StateInfo object must be passed.
@ -73,7 +63,8 @@ struct StateInfo {
Bitboard checkersBB;
PieceType capturedType;
StateInfo* previous;
CheckInfo ci;
Bitboard blockersForKing[COLOR_NB];
Bitboard checkSquares[PIECE_TYPE_NB];
};
// In a std::deque references to elements are unaffected upon resizing
@ -122,7 +113,7 @@ public:
Bitboard checkers() const;
Bitboard discovered_check_candidates() const;
Bitboard pinned_pieces(Color c) const;
const CheckInfo& check_info() const;
Bitboard check_squares(PieceType pt) const;
// Attacks to/from a given square
Bitboard attackers_to(Square s) const;
@ -184,7 +175,7 @@ private:
// Initialization helpers (used while setting up a position)
void set_castling_right(Color c, Square rfrom);
void set_state(StateInfo* si) const;
void set_check_info(CheckInfo* ci) const;
void set_check_info(StateInfo* si) const;
// Other helpers
void put_piece(Color c, PieceType pt, Square s);
@ -311,15 +302,15 @@ inline Bitboard Position::checkers() const {
}
inline Bitboard Position::discovered_check_candidates() const {
return st->ci.blockersForKing[~sideToMove] & pieces(sideToMove);
return st->blockersForKing[~sideToMove] & pieces(sideToMove);
}
inline Bitboard Position::pinned_pieces(Color c) const {
return st->ci.blockersForKing[c] & pieces(c);
return st->blockersForKing[c] & pieces(c);
}
inline const CheckInfo& Position::check_info() const {
return st->ci;
inline Bitboard Position::check_squares(PieceType pt) const {
return st->checkSquares[pt];
}
inline bool Position::pawn_passed(Color c, Square s) const {

4
src/search.cpp
View file

@ -883,7 +883,7 @@ moves_loop: // When in check search starts from here
moved_piece = pos.moved_piece(move);
givesCheck = type_of(move) == NORMAL && !pos.discovered_check_candidates()
? pos.check_info().checkSquares[type_of(pos.piece_on(from_sq(move)))] & to_sq(move)
? pos.check_squares(type_of(pos.piece_on(from_sq(move)))) & to_sq(move)
: pos.gives_check(move);
moveCountPruning = depth < 16 * ONE_PLY
@ -1285,7 +1285,7 @@ moves_loop: // When in check search starts from here
assert(is_ok(move));
givesCheck = type_of(move) == NORMAL && !pos.discovered_check_candidates()
? pos.check_info().checkSquares[type_of(pos.piece_on(from_sq(move)))] & to_sq(move)
? pos.check_squares(type_of(pos.piece_on(from_sq(move)))) & to_sq(move)
: pos.gives_check(move);
// Futility pruning