X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmovepick.h;h=e1a2e6df18d3386623ddce7ca77d4023f6a081ec;hp=fffd4708b05872d3229428a48d9dadd661ee810f;hb=c80d52c845357db880817d6ed91d02986b5d5384;hpb=969982406ce85e38b88d15768ae2d3ee31fe82bb

diff --git a/src/movepick.h b/src/movepick.h
index fffd4708..e1a2e6df 100644
--- a/src/movepick.h
+++ b/src/movepick.h
@@ -2,7 +2,7 @@
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
   Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
-  Copyright (C) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+  Copyright (C) 2015-2017 Marco Costalba, Joona Kiiski, Gary Linscott, 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
@@ -26,34 +26,46 @@
 
 #include "movegen.h"
 #include "position.h"
-#include "search.h"
 #include "types.h"
 
 
-/// The Stats struct stores moves statistics. According to the template parameter
-/// the class can store History and Countermoves. History records how often
-/// different moves have been successful or unsuccessful during the current search
-/// and is used for reduction and move ordering decisions.
-/// Countermoves store the move that refute a previous one. Entries are stored
-/// using only the moving piece and destination square, hence two moves with
-/// different origin but same destination and piece will be considered identical.
-template<typename T, bool CM = false>
-struct Stats {
+/// HistoryStats records how often quiet moves have been successful or unsuccessful
+/// during the current search, and is used for reduction and move ordering decisions.
+struct HistoryStats {
 
   static const Value Max = Value(1 << 28);
 
+  Value get(Color c, Move m) const { return table[c][from_sq(m)][to_sq(m)]; }
+  void clear() { std::memset(table, 0, sizeof(table)); }
+  void update(Color c, Move m, Value v) {
+
+    Square from = from_sq(m);
+    Square to = to_sq(m);
+
+    table[c][from][to] -= table[c][from][to] * abs(int(v)) / 324;
+    table[c][from][to] += int(v) * 32;
+  }
+
+private:
+  Value table[COLOR_NB][SQUARE_NB][SQUARE_NB];
+};
+
+
+/// A template struct, used to generate MoveStats and CounterMoveHistoryStats:
+/// MoveStats store the move that refute a previous one.
+/// CounterMoveHistoryStats is like HistoryStats, but with two consecutive moves.
+/// Entries are stored using only the moving piece and destination square, hence
+/// two moves with different origin but same destination and piece will be
+/// considered identical.
+template<typename T>
+struct Stats {
   const T* operator[](Piece pc) const { return table[pc]; }
   T* operator[](Piece pc) { return table[pc]; }
   void clear() { std::memset(table, 0, sizeof(table)); }
-
   void update(Piece pc, Square to, Move m) { table[pc][to] = m; }
-
   void update(Piece pc, Square to, Value v) {
 
-    if (abs(int(v)) >= 324)
-        return;
-
-    table[pc][to] -= table[pc][to] * abs(int(v)) / (CM ? 936 : 324);
+    table[pc][to] -= table[pc][to] * abs(int(v)) / 936;
     table[pc][to] += int(v) * 32;
   }
 
@@ -62,8 +74,7 @@ private:
 };
 
 typedef Stats<Move> MoveStats;
-typedef Stats<Value, false> HistoryStats;
-typedef Stats<Value,  true> CounterMoveStats;
+typedef Stats<Value> CounterMoveStats;
 typedef Stats<CounterMoveStats> CounterMoveHistoryStats;
 
 
@@ -73,6 +84,7 @@ typedef Stats<CounterMoveStats> CounterMoveHistoryStats;
 /// when MOVE_NONE is returned. In order to improve the efficiency of the alpha
 /// beta algorithm, MovePicker attempts to return the moves which are most likely
 /// to get a cut-off first.
+namespace Search { struct Stack; }
 
 class MovePicker {
 public:
@@ -87,8 +99,7 @@ public:
 
 private:
   template<GenType> void score();
-  void generate_next_stage();
-  ExtMove* begin() { return moves; }
+  ExtMove* begin() { return cur; }
   ExtMove* end() { return endMoves; }
 
   const Position& pos;
@@ -96,12 +107,11 @@ private:
   Move countermove;
   Depth depth;
   Move ttMove;
-  ExtMove killers[3];
   Square recaptureSquare;
   Value threshold;
   int stage;
-  ExtMove* endBadCaptures = moves + MAX_MOVES - 1;
-  ExtMove moves[MAX_MOVES], *cur = moves, *endMoves = moves;
+  ExtMove *cur, *endMoves, *endBadCaptures;
+  ExtMove moves[MAX_MOVES];
 };
 
 #endif // #ifndef MOVEPICK_H_INCLUDED