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Explicitly use delta psqt values when possible

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Instead of add and subtract pqst values corrisponding to
the move starting and destination squares, do it in one
go with the helper function pst_delta<>()

This simplifies the code and also better documents that what
we need is a delta value, not an absolute one.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-06-28 05:56:58 +02:00
parent d9e3be4790
commit bbb2462576
3 changed files with 41 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
src/position.h
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@@ -127,6 +127,11 @@ class Position {
friend class EndgameFunctions;
public:
enum GamePhase {
MidGame,
EndGame
};
// Constructors
Position() {};
Position(const Position& pos);
@@ -272,7 +277,7 @@ public:
Value eg_value() const;
Value non_pawn_material(Color c) const;
Phase game_phase() const;
Value mg_pst_delta(Move m) const;
template<GamePhase> Value pst_delta(Piece piece, Square from, Square to) const;
// Game termination checks
bool is_mate() const;
@@ -328,10 +333,6 @@ private:
Key compute_material_key() const;
// Computing incremental evaluation scores and material counts
enum GamePhase {
MidGame,
EndGame
};
template<GamePhase> Value pst(Color c, PieceType pt, Square s) const;
template<GamePhase> Value compute_value() const;
Value compute_non_pawn_material(Color c) const;
@@ -622,15 +623,16 @@ inline Key Position::get_material_key() const {
return st->materialKey;
}
template<Position::GamePhase Phase>
template<Position::GamePhase Ph>
inline Value Position::pst(Color c, PieceType pt, Square s) const {
return (Phase == MidGame ? MgPieceSquareTable[piece_of_color_and_type(c, pt)][s]
: EgPieceSquareTable[piece_of_color_and_type(c, pt)][s]);
return (Ph == MidGame ? MgPieceSquareTable[piece_of_color_and_type(c, pt)][s]
: EgPieceSquareTable[piece_of_color_and_type(c, pt)][s]);
}
inline Value Position::mg_pst_delta(Move m) const {
return MgPieceSquareTable[piece_on(move_from(m))][move_to(m)]
-MgPieceSquareTable[piece_on(move_from(m))][move_from(m)];
template<Position::GamePhase Ph>
inline Value Position::pst_delta(Piece piece, Square from, Square to) const {
return (Ph == MidGame ? MgPieceSquareTable[piece][to] - MgPieceSquareTable[piece][from]
: EgPieceSquareTable[piece][to] - EgPieceSquareTable[piece][from]);
}
inline Value Position::mg_value() const {