Unroll color loops in get_pawn_info

[stockfish] / src / pawns.h

diff --git a/src/pawns.h b/src/pawns.h
index 01a9d6e93c48acd02495b5404f59a585e933ca71..afb456c9036bdd483181b2e3403ca423ce4eb056 100644 (file)
--- a/src/pawns.h
+++ b/src/pawns.h
@@ -1,18 +1,18 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008 Marco Costalba
+  Copyright (C) 2008-2009 Marco Costalba
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
-  
+
   Stockfish is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
-  
+
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
@@ -25,45 +25,53 @@
 //// Includes
 ////
 
-#include "position.h"
-
+#include "bitboard.h"
+#include "value.h"
 
 ////
 //// Types
 ////
 
-/// 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
+/// 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 Position;
 
 class PawnInfo {
 
   friend class PawnInfoTable;
 
 public:
+  PawnInfo() { clear(); }
+
   Value mg_value() const;
   Value eg_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() const;
-  bool file_is_half_open(Color c, File f) const;
-  bool has_open_file_to_left(Color c, File f) const;
-  bool has_open_file_to_right(Color c, File f) 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;
+  int get_king_shelter(const Position& pos, Color c, Square ksq);
 
 private:
   void clear();
+  int updateShelter(const Position& pos, Color c, Square ksq);
 
   Key key;
   Bitboard passedPawns;
+  Bitboard pawnAttacks[2];
   int16_t mgValue, egValue;
-  int8_t ksStormValue[2], qsStormValue[2];
+  int16_t ksStormValue[2], qsStormValue[2];
   uint8_t halfOpenFiles[2];
+  Square kingSquares[2];
+  uint8_t 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
@@ -74,12 +82,16 @@ class PawnInfoTable {
 public:
   PawnInfoTable(unsigned numOfEntries);
   ~PawnInfoTable();
-  void clear();
-  PawnInfo *get_pawn_info(const Position &pos);
+  PawnInfo* get_pawn_info(const Position& pos);
 
 private:
+  typedef std::pair<Value, Value> Values;
+
+  template<Color Us>
+  Values evaluate_pawns(const Position& pos, Bitboard ourPawns, Bitboard theirPawns, PawnInfo* pi);
+
   unsigned size;
-  PawnInfo *entries;
+  PawnInfo* entries;
 };
 
 
@@ -99,6 +111,10 @@ inline Bitboard PawnInfo::passed_pawns() const {
   return passedPawns;
 }
 
+inline Bitboard PawnInfo::pawn_attacks(Color c) const {
+  return pawnAttacks[c];
+}
+
 inline Value PawnInfo::kingside_storm_value(Color c) const {
   return Value(ksStormValue[c]);
 }
@@ -107,25 +123,20 @@ inline Value PawnInfo::queenside_storm_value(Color c) const {
   return Value(qsStormValue[c]);
 }
 
-inline bool PawnInfo::file_is_half_open(Color c, File f) const {
+inline int PawnInfo::file_is_half_open(Color c, File f) const {
   return (halfOpenFiles[c] & (1 << int(f)));
 }
 
-inline bool PawnInfo::has_open_file_to_left(Color c, File f) const {
+inline int PawnInfo::has_open_file_to_left(Color c, File f) const {
   return halfOpenFiles[c] & ((1 << int(f)) - 1);
 }
 
-inline bool PawnInfo::has_open_file_to_right(Color c, File f) const {
+inline int PawnInfo::has_open_file_to_right(Color c, File f) const {
   return halfOpenFiles[c] & ~((1 << int(f+1)) - 1);
 }
 
-inline void PawnInfo::clear() {
-
-  Key k = key;
-  memset(this, 0, sizeof(PawnInfo));
-  key = k;
-  halfOpenFiles[WHITE] = halfOpenFiles[BLACK] = 0xFF;
+inline int PawnInfo::get_king_shelter(const Position& pos, Color c, Square ksq) {
+  return (kingSquares[c] == ksq ? kingShelters[c] : updateShelter(pos, c, ksq));
 }
 
-
 #endif // !defined(PAWNS_H_INCLUDED)