X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmovepick.h;h=60bf0b947a6639af89eb66210d5dcffbe9827826;hp=f3839bf024d9e03a81db31cb93dadf8e475f7ca9;hb=d40e7ee20903257cb0126f1945d63257ded022c3;hpb=800410eef1c0811d046ee2332b3afda21284b876

diff --git a/src/movepick.h b/src/movepick.h
index f3839bf0..60bf0b94 100644
--- a/src/movepick.h
+++ b/src/movepick.h
@@ -1,7 +1,8 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2013 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2015-2018 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
@@ -20,56 +21,86 @@
 #ifndef MOVEPICK_H_INCLUDED
 #define MOVEPICK_H_INCLUDED
 
-#include <algorithm> // For std::max
-#include <cstring>   // For std::memset
+#include <array>
+#include <limits>
+#include <type_traits>
 
 #include "movegen.h"
 #include "position.h"
-#include "search.h"
 #include "types.h"
 
+/// StatsEntry stores the stat table value. It is usually a number but could
+/// be a move or even a nested history. We use a class instead of naked value
+/// to directly call history update operator<<() on the entry so to use stats
+/// tables at caller sites as simple multi-dim arrays.
+template<typename T, int W, int D>
+class StatsEntry {
 
-/// The Stats struct stores moves statistics. According to the template parameter
-/// the class can store History, Gains 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. Gains records the move's
-/// best evaluation gain from one ply to the next and is used for pruning decisions.
-/// Countermoves store the move that refute a previous one. Entries are stored
-/// according only to moving piece and destination square, hence two moves with
-/// different origin but same destination and piece will be considered identical.
-template<bool Gain, typename T>
-struct Stats {
+  static const bool IsInt = std::is_integral<T>::value;
+  typedef typename std::conditional<IsInt, int, T>::type TT;
 
-  static const Value Max = Value(2000);
+  T entry;
 
-  const T* operator[](Piece p) const { return table[p]; }
-  void clear() { std::memset(table, 0, sizeof(table)); }
-
-  void update(Piece p, Square to, Move m) {
+public:
+  T* get() { return &entry; }
+  void operator=(const T& v) { entry = v; }
+  operator TT() const { return entry; }
 
-    if (m == table[p][to].first)
-        return;
+  void operator<<(int bonus) {
 
-    table[p][to].second = table[p][to].first;
-    table[p][to].first = m;
-  }
+    assert(abs(bonus) <= D); // Ensure range is [-W * D, W * D]
+    assert(W * D < std::numeric_limits<T>::max()); // Ensure we don't overflow
 
-  void update(Piece p, Square to, Value v) {
+    entry += bonus * W - entry * abs(bonus) / D;
 
-    if (Gain)
-        table[p][to] = std::max(v, table[p][to] - 1);
+    assert(abs(entry) <= W * D);
+  }
+};
 
-    else if (abs(table[p][to] + v) < Max)
-        table[p][to] +=  v;
+/// Stats is a generic N-dimensional array used to store various statistics.
+/// The first template T parameter is the base type of the array, the W parameter
+/// is the weight applied to the bonuses when we update values with the << operator,
+/// the D parameter limits the range of updates (range is [-W * D, W * D]), and
+/// the last parameters (Size and Sizes) encode the dimensions of the array.
+template <typename T, int W, int D, int Size, int... Sizes>
+struct Stats : public std::array<Stats<T, W, D, Sizes...>, Size>
+{
+  T* get() { return this->at(0).get(); }
+
+  void fill(const T& v) {
+    T* p = get();
+    std::fill(p, p + sizeof(*this) / sizeof(*p), v);
   }
+};
 
-private:
-  T table[PIECE_NB][SQUARE_NB];
+template <typename T, int W, int D, int Size>
+struct Stats<T, W, D, Size> : public std::array<StatsEntry<T, W, D>, Size> {
+  T* get() { return this->at(0).get(); }
 };
 
-typedef Stats< true, Value> GainsStats;
-typedef Stats<false, Value> HistoryStats;
-typedef Stats<false, std::pair<Move, Move> > CountermovesStats;
+/// Different tables use different W/D parameter, name them to ease readibility
+enum StatsParams { W2 = 2, W32 = 32, D324 = 324, D936 = 936, NOT_USED = 0 };
+
+/// ButterflyHistory records how often quiet moves have been successful or
+/// unsuccessful during the current search, and is used for reduction and move
+/// ordering decisions. It uses 2 tables (one for each color) indexed by
+/// the move's from and to squares, see chessprogramming.wikispaces.com/Butterfly+Boards
+typedef Stats<int16_t, W32, D324, COLOR_NB, int(SQUARE_NB) * int(SQUARE_NB)> ButterflyHistory;
+
+/// CounterMoveHistory stores counter moves indexed by [piece][to] of the previous
+/// move, see chessprogramming.wikispaces.com/Countermove+Heuristic
+typedef Stats<Move, NOT_USED, NOT_USED, PIECE_NB, SQUARE_NB> CounterMoveHistory;
+
+/// CapturePieceToHistory is addressed by a move's [piece][to][captured piece type]
+typedef Stats<int16_t, W2, D324, PIECE_NB, SQUARE_NB, PIECE_TYPE_NB> CapturePieceToHistory;
+
+/// PieceToHistory is like ButterflyHistory but is addressed by a move's [piece][to]
+typedef Stats<int16_t, W32, D936, PIECE_NB, SQUARE_NB> PieceToHistory;
+
+/// ContinuationHistory is the combined history of a given pair of moves, usually
+/// the current one given a previous one. The nested history table is based on
+/// PieceToHistory instead of ButterflyBoards.
+typedef Stats<PieceToHistory, W32, NOT_USED, PIECE_NB, SQUARE_NB> ContinuationHistory;
 
 
 /// MovePicker class is used to pick one pseudo legal move at a time from the
@@ -79,32 +110,35 @@ typedef Stats<false, std::pair<Move, Move> > CountermovesStats;
 /// beta algorithm, MovePicker attempts to return the moves which are most likely
 /// to get a cut-off first.
 
-class MovePicker {
-
-  MovePicker& operator=(const MovePicker&); // Silence a warning under MSVC
+enum PickType { NEXT, BEST_SCORE };
 
+class MovePicker {
 public:
-  MovePicker(const Position&, Move, Depth, const HistoryStats&, Square);
-  MovePicker(const Position&, Move, const HistoryStats&, PieceType);
-  MovePicker(const Position&, Move, Depth, const HistoryStats&, Move*, Search::Stack*);
- ~MovePicker();
-
-  template<bool SpNode> Move next_move();
+  MovePicker(const MovePicker&) = delete;
+  MovePicker& operator=(const MovePicker&) = delete;
+  MovePicker(const Position&, Move, Value, const CapturePieceToHistory*);
+  MovePicker(const Position&, Move, Depth, const ButterflyHistory*,  const CapturePieceToHistory*, Square);
+  MovePicker(const Position&, Move, Depth, const ButterflyHistory*, const CapturePieceToHistory*, const PieceToHistory**, Move, Move*);
+  Move next_move(bool skipQuiets = false);
 
 private:
+  template<PickType T, typename Pred> Move select_move(Pred);
   template<GenType> void score();
-  void generate_next();
+  ExtMove* begin() { return cur; }
+  ExtMove* end() { return endMoves; }
 
   const Position& pos;
-  const HistoryStats& history;
-  Search::Stack* ss;
-  Move* countermoves;
-  Depth depth;
+  const ButterflyHistory* mainHistory;
+  const CapturePieceToHistory* captureHistory;
+  const PieceToHistory** contHistory;
   Move ttMove;
-  ExtMove killers[4];
+  ExtMove refutations[3], *cur, *endMoves, *endBadCaptures;
+  int stage;
+  Move move;
   Square recaptureSquare;
-  int captureThreshold, stage;
-  ExtMove *moves, *cur, *end, *endQuiets, *endBadCaptures;
+  Value threshold;
+  Depth depth;
+  ExtMove moves[MAX_MOVES];
 };
 
 #endif // #ifndef MOVEPICK_H_INCLUDED