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Use a union to fast and simply backup info in do_move()

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This nice union trick let us optimize the speed and
remove the now unuseful backup() and restore() functions.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-02-20 11:13:19 +01:00
parent 95cfc0e306
commit 1dc27f3232
2 changed files with 16 additions and 65 deletions
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22
src/position.h
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@@ -240,8 +240,6 @@ public:
bool square_is_weak(Square s, Color c) const;
// Doing and undoing moves
void backup(UndoInfo &u) const;
void restore(const UndoInfo &u);
void do_move(Move m, UndoInfo &u);
void undo_move(Move m, const UndoInfo &u);
void do_null_move(UndoInfo &u);
@@ -345,13 +343,19 @@ private:
File initialKFile, initialKRFile, initialQRFile;
// Info backed up in do_move()
mutable Bitboard pinners[2], pinned[2], dcCandidates[2];
Bitboard checkersBB;
Key key, pawnKey, materialKey;
int castleRights, rule50;
Square epSquare;
Move lastMove;
Value mgValue, egValue;
union {
UndoInfo undoInfoUnion;
struct { // Must have the same layout of UndoInfo
mutable Bitboard pinners[2], pinned[2], dcCandidates[2];
Bitboard checkersBB;
Key key, pawnKey, materialKey;
int castleRights, rule50;
Square epSquare;
Move lastMove;
Value mgValue, egValue;
PieceType capture;
};
};
// Static variables
static int castleRightsMask[64];