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Code Issues Releases Wiki Activity

Retire empty_squares()

Browse source 
Use ~pos.occupied_squares() instead and avoid to
hide the ~ computation.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2012-02-19 11:44:45 +01:00
parent ec5b9994b5
commit 4aadd1e401
2 changed files with 8 additions and 13 deletions
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12
src/movegen.cpp
View file

@ -155,7 +155,7 @@ namespace {
// Single and double pawn pushes, no promotions // Single and double pawn pushes, no promotions
if (Type != MV_CAPTURE) if (Type != MV_CAPTURE)
{ {
emptySquares = (Type == MV_QUIET ? target : pos.empty_squares()); emptySquares = (Type == MV_QUIET ? target : ~pos.occupied_squares());
b1 = move_pawns<UP>(pawnsNotOn7) & emptySquares; b1 = move_pawns<UP>(pawnsNotOn7) & emptySquares;
b2 = move_pawns<UP>(b1 & TRank3BB) & emptySquares; b2 = move_pawns<UP>(b1 & TRank3BB) & emptySquares;
@ -193,7 +193,7 @@ namespace {
if (pawnsOn7 && (Type != MV_EVASION || (target & TRank8BB))) if (pawnsOn7 && (Type != MV_EVASION || (target & TRank8BB)))
{ {
if (Type == MV_CAPTURE) if (Type == MV_CAPTURE)
emptySquares = pos.empty_squares(); emptySquares = ~pos.occupied_squares();
if (Type == MV_EVASION) if (Type == MV_EVASION)
emptySquares &= target; emptySquares &= target;
@ -246,7 +246,7 @@ namespace {
if (*pl != SQ_NONE) if (*pl != SQ_NONE)
{ {
target = ci.checkSq[Pt] & pos.empty_squares(); // Non capture checks only target = ci.checkSq[Pt] & ~pos.occupied_squares(); // Non capture checks only
do { do {
from = *pl; from = *pl;
@ -321,10 +321,10 @@ MoveStack* generate(const Position& pos, MoveStack* mlist) {
target = pos.pieces(~us); target = pos.pieces(~us);
else if (Type == MV_QUIET) else if (Type == MV_QUIET)
target = pos.empty_squares(); target = ~pos.occupied_squares();
else if (Type == MV_NON_EVASION) else if (Type == MV_NON_EVASION)
target = pos.pieces(~us) | pos.empty_squares(); target = pos.pieces(~us) | ~pos.occupied_squares();
mlist = (us == WHITE ? generate_pawn_moves<WHITE, Type>(pos, mlist, target) mlist = (us == WHITE ? generate_pawn_moves<WHITE, Type>(pos, mlist, target)
: generate_pawn_moves<BLACK, Type>(pos, mlist, target)); : generate_pawn_moves<BLACK, Type>(pos, mlist, target));
@ -369,7 +369,7 @@ MoveStack* generate<MV_QUIET_CHECK>(const Position& pos, MoveStack* mlist) {
if (pt == PAWN) if (pt == PAWN)
continue; // Will be generated togheter with direct checks continue; // Will be generated togheter with direct checks
Bitboard b = pos.attacks_from(Piece(pt), from) & pos.empty_squares(); Bitboard b = pos.attacks_from(Piece(pt), from) & ~pos.occupied_squares();
if (pt == KING) if (pt == KING)
b &= ~PseudoAttacks[QUEEN][ci.ksq]; b &= ~PseudoAttacks[QUEEN][ci.ksq];

9
src/position.h
View file

@ -108,7 +108,6 @@ public:
Color side_to_move() const; Color side_to_move() const;
// Bitboard representation of the position // Bitboard representation of the position
Bitboard empty_squares() const;
Bitboard occupied_squares() const; Bitboard occupied_squares() const;
Bitboard pieces(Color c) const; Bitboard pieces(Color c) const;
Bitboard pieces(PieceType pt) const; Bitboard pieces(PieceType pt) const;
@ -291,10 +290,6 @@ inline Bitboard Position::occupied_squares() const {
return occupied; return occupied;
} }
inline Bitboard Position::empty_squares() const {
return ~occupied;
}
inline Bitboard Position::pieces(Color c) const { inline Bitboard Position::pieces(Color c) const {
return byColorBB[c]; return byColorBB[c];
} }
@ -356,11 +351,11 @@ inline Bitboard Position::attacks_from<PAWN>(Square s, Color c) const {
} }
inline Bitboard Position::attacks_from(Piece p, Square s) const { inline Bitboard Position::attacks_from(Piece p, Square s) const {
return attacks_from(p, s, occupied_squares()); return attacks_from(p, s, occupied);
} }
inline Bitboard Position::attackers_to(Square s) const { inline Bitboard Position::attackers_to(Square s) const {
return attackers_to(s, occupied_squares()); return attackers_to(s, occupied);
} }
inline Bitboard Position::checkers() const { inline Bitboard Position::checkers() const {