X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fpawns.h;h=f2b4441a5d46259909acf06fa91ecb20d644b524;hb=96eefc4af65204cd2ddad64ac53b8d449f49efa5;hp=76a98566b7570ba1046a003279fb5947de07ccda;hpb=2a2353aac65d6f7263081dc373c768c8717602db;p=stockfish
diff --git a/src/pawns.h b/src/pawns.h
index 76a98566..f2b4441a 100644
--- a/src/pawns.h
+++ b/src/pawns.h
@@ -1,7 +1,7 @@
/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+ Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -17,38 +17,28 @@
along with this program. If not, see .
*/
-
#if !defined(PAWNS_H_INCLUDED)
#define PAWNS_H_INCLUDED
-////
-//// Includes
-////
-
-#include "bitboard.h"
#include "position.h"
-#include "value.h"
-
-////
-//// Types
-////
+#include "tt.h"
+#include "types.h"
const int PawnTableSize = 16384;
/// PawnInfo is a class which contains various information about a pawn
/// structure. Currently, it only includes a middle game and an end game
/// pawn structure evaluation, and a bitboard of passed pawns. We may want
-/// to add further information in the future. A lookup to the pawn hash table
-/// (performed by calling the get_pawn_info method in a PawnInfoTable object)
-/// returns a pointer to a PawnInfo object.
+/// to add further information in the future. A lookup to the pawn hash
+/// table (performed by calling the pawn_info method in a PawnInfoTable
+/// object) returns a pointer to a PawnInfo object.
+
class PawnInfo {
friend class PawnInfoTable;
public:
Score pawns_value() const;
- Value kingside_storm_value(Color c) const;
- Value queenside_storm_value(Color c) const;
Bitboard pawn_attacks(Color c) const;
Bitboard passed_pawns(Color c) const;
int file_is_half_open(Color c, File f) const;
@@ -67,49 +57,24 @@ private:
Bitboard pawnAttacks[2];
Square kingSquares[2];
Score value;
- int ksStormValue[2];
- int qsStormValue[2];
int halfOpenFiles[2];
Score kingShelters[2];
};
-/// The PawnInfoTable class represents a pawn hash table. It is basically
-/// just an array of PawnInfo objects and a few methods for accessing these
-/// objects. The most important method is get_pawn_info, which looks up a
-/// position in the table and returns a pointer to a PawnInfo object.
-
-class PawnInfoTable {
- enum SideType { KingSide, QueenSide };
+/// The PawnInfoTable class represents a pawn hash table. The most important
+/// method is pawn_info, which returns a pointer to a PawnInfo object.
+class PawnInfoTable : public SimpleHash {
public:
- PawnInfoTable();
- ~PawnInfoTable();
- PawnInfo* get_pawn_info(const Position& pos) const;
- void prefetch(Key key) const;
+ PawnInfo* pawn_info(const Position& pos) const;
private:
template
- Score evaluate_pawns(const Position& pos, Bitboard ourPawns, Bitboard theirPawns, PawnInfo* pi) const;
-
- template
- int evaluate_pawn_storm(Square s, Rank r, File f, Bitboard theirPawns) const;
-
- PawnInfo* entries;
+ static Score evaluate_pawns(const Position& pos, Bitboard ourPawns, Bitboard theirPawns, PawnInfo* pi);
};
-////
-//// Inline functions
-////
-
-inline void PawnInfoTable::prefetch(Key key) const {
-
- unsigned index = unsigned(key & (PawnTableSize - 1));
- PawnInfo* pi = entries + index;
- ::prefetch((char*) pi);
-}
-
inline Score PawnInfo::pawns_value() const {
return value;
}
@@ -118,20 +83,12 @@ inline Bitboard PawnInfo::pawn_attacks(Color c) const {
return pawnAttacks[c];
}
-inline Value PawnInfo::kingside_storm_value(Color c) const {
- return Value(ksStormValue[c]);
-}
-
-inline Value PawnInfo::queenside_storm_value(Color c) const {
- return Value(qsStormValue[c]);
-}
-
inline Bitboard PawnInfo::passed_pawns(Color c) const {
return passedPawns[c];
}
inline int PawnInfo::file_is_half_open(Color c, File f) const {
- return (halfOpenFiles[c] & (1 << int(f)));
+ return halfOpenFiles[c] & (1 << int(f));
}
inline int PawnInfo::has_open_file_to_left(Color c, File f) const {
@@ -142,31 +99,6 @@ inline int PawnInfo::has_open_file_to_right(Color c, File f) const {
return halfOpenFiles[c] & ~((1 << int(f+1)) - 1);
}
-/// PawnInfo::updateShelter() calculates and caches king shelter. It is called
-/// only when king square changes, about 20% of total king_shelter() calls.
-template
-Score PawnInfo::updateShelter(const Position& pos, Square ksq) {
-
- const int Shift = (Us == WHITE ? 8 : -8);
-
- Bitboard pawns;
- int r, shelter = 0;
-
- if (relative_rank(Us, ksq) <= RANK_4)
- {
- pawns = pos.pieces(PAWN, Us) & this_and_neighboring_files_bb(ksq);
- r = square_rank(ksq) * 8;
- for (int i = 1; i < 4; i++)
- {
- r += Shift;
- shelter += BitCount8Bit[(pawns >> r) & 0xFF] * (128 >> i);
- }
- }
- kingSquares[Us] = ksq;
- kingShelters[Us] = make_score(shelter, 0);
- return kingShelters[Us];
-}
-
template
inline Score PawnInfo::king_shelter(const Position& pos, Square ksq) {
return kingSquares[Us] == ksq ? kingShelters[Us] : updateShelter(pos, ksq);