X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fpawns.h;h=353cb6a5f5e87c06ab3e65ce3bf2dc0c35c6fb49;hp=86708488cb276f6c13ce40d768d7bda7991d3485;hb=ed72a1e9ba37a9fa2674da8f46bb0597a1721c2d;hpb=85a7456bd7e8a1a01cdbfa8f4b6fb563d15a37c6
diff --git a/src/pawns.h b/src/pawns.h
index 86708488..353cb6a5 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) 2008-2015 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
@@ -17,147 +17,71 @@
along with this program. If not, see .
*/
-
-#if !defined(PAWNS_H_INCLUDED)
+#ifndef PAWNS_H_INCLUDED
#define PAWNS_H_INCLUDED
-////
-//// Includes
-////
-
-#include "bitboard.h"
+#include "misc.h"
#include "position.h"
-#include "value.h"
-
-////
-//// Types
-////
-
-const int PawnTableSize = 16384;
+#include "types.h"
-/// 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.
-class PawnInfo {
+namespace Pawns {
- friend class PawnInfoTable;
+/// Pawns::Entry contains various information about a pawn structure. A lookup
+/// to the pawn hash table (performed by calling the probe function) returns a
+/// pointer to an Entry object.
-public:
- Score pawns_value() const;
- Bitboard pawn_attacks(Color c) const;
- Bitboard passed_pawns(Color c) const;
- int file_is_half_open(Color c, File f) const;
- int has_open_file_to_left(Color c, File f) const;
- int has_open_file_to_right(Color c, File f) const;
+struct Entry {
- template
- Score king_shelter(const Position& pos, Square ksq);
-
-private:
- template
- Score updateShelter(const Position& pos, Square ksq);
+ Score pawns_score() const { return score; }
+ Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; }
+ Bitboard passed_pawns(Color c) const { return passedPawns[c]; }
+ Bitboard pawn_attacks_span(Color c) const { return pawnAttacksSpan[c]; }
+ int pawn_span(Color c) const { return pawnSpan[c]; }
+ int pawn_asymmetry() const { return asymmetry; }
- Key key;
- Bitboard passedPawns[2];
- Bitboard pawnAttacks[2];
- Square kingSquares[2];
- Score value;
- 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.
+ int semiopen_file(Color c, File f) const {
+ return semiopenFiles[c] & (1 << f);
+ }
-class PawnInfoTable {
+ int semiopen_side(Color c, File f, bool leftSide) const {
+ return semiopenFiles[c] & (leftSide ? (1 << f) - 1 : ~((1 << (f + 1)) - 1));
+ }
- enum SideType { KingSide, QueenSide };
+ int pawns_on_same_color_squares(Color c, Square s) const {
+ return pawnsOnSquares[c][!!(DarkSquares & s)];
+ }
- PawnInfoTable(const PawnInfoTable&);
- PawnInfoTable& operator=(const PawnInfoTable&);
+ template
+ Score king_safety(const Position& pos, Square ksq) {
+ return kingSquares[Us] == ksq && castlingRights[Us] == pos.can_castle(Us)
+ ? kingSafety[Us] : (kingSafety[Us] = do_king_safety(pos, ksq));
+ }
-public:
- PawnInfoTable();
- ~PawnInfoTable();
- PawnInfo* get_pawn_info(const Position& pos) const;
- void prefetch(Key key) const;
+ template
+ Score do_king_safety(const Position& pos, Square ksq);
-private:
template
- Score evaluate_pawns(const Position& pos, Bitboard ourPawns, Bitboard theirPawns, PawnInfo* pi) const;
+ Value shelter_storm(const Position& pos, Square ksq);
- PawnInfo* entries;
+ Key key;
+ Score score;
+ Bitboard passedPawns[COLOR_NB];
+ Bitboard pawnAttacks[COLOR_NB];
+ Bitboard pawnAttacksSpan[COLOR_NB];
+ Square kingSquares[COLOR_NB];
+ Score kingSafety[COLOR_NB];
+ int castlingRights[COLOR_NB];
+ int semiopenFiles[COLOR_NB];
+ int pawnSpan[COLOR_NB];
+ int pawnsOnSquares[COLOR_NB][COLOR_NB]; // [color][light/dark squares]
+ int asymmetry;
};
+typedef HashTable Table;
-////
-//// 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;
-}
-
-inline Bitboard PawnInfo::pawn_attacks(Color c) const {
- return pawnAttacks[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)));
-}
-
-inline int PawnInfo::has_open_file_to_left(Color c, File f) const {
- return halfOpenFiles[c] & ((1 << int(f)) - 1);
-}
-
-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];
-}
+void init();
+Entry* probe(const Position& pos);
-template
-inline Score PawnInfo::king_shelter(const Position& pos, Square ksq) {
- return kingSquares[Us] == ksq ? kingShelters[Us] : updateShelter(pos, ksq);
-}
+} // namespace Pawns
-#endif // !defined(PAWNS_H_INCLUDED)
+#endif // #ifndef PAWNS_H_INCLUDED