Increase max hash size to 16GB

[stockfish] / src / tt.h

diff --git a/src/tt.h b/src/tt.h
index 1caa277e821ac0463110fe0df6487b74f7e20f79..a926d4ada6887b9d63ae9a77a91ff787d00b1cdd 100644 (file)
--- a/src/tt.h
+++ b/src/tt.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) 2008-2013 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2014 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
@@ -17,68 +17,58 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#if !defined(TT_H_INCLUDED)
+#ifndef TT_H_INCLUDED
 #define TT_H_INCLUDED
 
 #include "misc.h"
 #include "types.h"
 
-/// The TTEntry is the class of transposition table entries
+/// The TTEntry is the 128 bit transposition table entry, defined as below:
 ///
-/// A TTEntry needs 128 bits to be stored
-///
-/// bit  0-31: key
-/// bit 32-63: data
-/// bit 64-79: value
-/// bit 80-95: depth
-/// bit 96-111: static value
-/// bit 112-127: margin of static value
-///
-/// the 32 bits of the data field are so defined
-///
-/// bit  0-15: move
-/// bit 16-20: not used
-/// bit 21-22: value type
-/// bit 23-31: generation
+/// key: 32 bit
+/// move: 16 bit
+/// bound type: 8 bit
+/// generation: 8 bit
+/// value: 16 bit
+/// depth: 16 bit
+/// static value: 16 bit
+/// static margin: 16 bit
 
-class TTEntry {
+struct TTEntry {
 
-public:
-  void save(uint32_t k, Value v, Bound b, Depth d, Move m, int g, Value ev, Value em) {
+  void save(uint32_t k, Value v, Bound b, Depth d, Move m, int g, Value ev) {
 
     key32        = (uint32_t)k;
     move16       = (uint16_t)m;
-    bound        = (uint8_t)b;
+    bound8       = (uint8_t)b;
     generation8  = (uint8_t)g;
     value16      = (int16_t)v;
     depth16      = (int16_t)d;
     evalValue    = (int16_t)ev;
-    evalMargin   = (int16_t)em;
   }
-  void set_generation(int g) { generation8 = (uint8_t)g; }
+  void set_generation(uint8_t g) { generation8 = g; }
 
   uint32_t key() const      { return key32; }
   Depth depth() const       { return (Depth)depth16; }
   Move move() const         { return (Move)move16; }
   Value value() const       { return (Value)value16; }
-  Bound type() const        { return (Bound)bound; }
+  Bound bound() const       { return (Bound)bound8; }
   int generation() const    { return (int)generation8; }
   Value eval_value() const  { return (Value)evalValue; }
-  Value eval_margin() const { return (Value)evalMargin; }
 
 private:
   uint32_t key32;
   uint16_t move16;
-  uint8_t bound, generation8;
-  int16_t value16, depth16, evalValue, evalMargin;
+  uint8_t bound8, generation8;
+  int16_t value16, depth16, evalValue;
 };
 
 
 /// A TranspositionTable consists of a power of 2 number of clusters and each
 /// cluster consists of ClusterSize number of TTEntry. Each non-empty entry
-/// contains information of exactly one position. Size of a cluster shall not be
-/// bigger than a cache line size. In case it is less, it should be padded to
-/// guarantee always aligned accesses.
+/// contains information of exactly one position. The size of a cluster should
+/// not be bigger than a cache line size. In case it is less, it should be padded
+/// to guarantee always aligned accesses.
 
 class TranspositionTable {
 
@@ -86,20 +76,20 @@ class TranspositionTable {
 
 public:
  ~TranspositionTable() { free(mem); }
-  void new_search() { generation++; }
+  void new_search() { ++generation; }
 
-  TTEntry* probe(const Key key) const;
+  const TTEntry* probe(const Key key) const;
   TTEntry* first_entry(const Key key) const;
   void refresh(const TTEntry* tte) const;
-  void set_size(size_t mbSize);
+  void set_size(uint64_t mbSize);
   void clear();
-  void store(const Key key, Value v, Bound type, Depth d, Move m, Value statV, Value kingD);
+  void store(const Key key, Value v, Bound type, Depth d, Move m, Value statV);
 
 private:
   uint32_t hashMask;
   TTEntry* table;
   void* mem;
-  uint8_t generation; // Size must be not bigger then TTEntry::generation8
+  uint8_t generation; // Size must be not bigger than TTEntry::generation8
 };
 
 extern TranspositionTable TT;
@@ -116,11 +106,11 @@ inline TTEntry* TranspositionTable::first_entry(const Key key) const {
 
 
 /// TranspositionTable::refresh() updates the 'generation' value of the TTEntry
-/// to avoid aging. Normally called after a TT hit.
+/// to avoid aging. It is normally called after a TT hit.
 
 inline void TranspositionTable::refresh(const TTEntry* tte) const {
 
   const_cast<TTEntry*>(tte)->set_generation(generation);
 }
 
-#endif // !defined(TT_H_INCLUDED)
+#endif // #ifndef TT_H_INCLUDED