/*
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
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 14 bytes 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
+/// eval value 16 bit
+
+struct TTEntry {
+
+ Move move() const { return (Move )move16; }
+ Bound bound() const { return (Bound)bound8; }
+ Value value() const { return (Value)value16; }
+ Depth depth() const { return (Depth)depth16; }
+ Value eval_value() const { return (Value)evalValue; }
-class TTEntry {
+private:
+ friend class TranspositionTable;
-public:
- void save(uint32_t k, Value v, Bound b, Depth d, Move m, int g, Value ev, Value em) {
-
- key32 = (uint32_t)k;
- move16 = (uint16_t)m;
- bound = (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 save(uint32_t k, Value v, Bound b, Depth d, Move m, uint8_t g, Value ev) {
- 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; }
- int generation() const { return (int)generation8; }
- Value eval_value() const { return (Value)evalValue; }
- Value eval_margin() const { return (Value)evalMargin; }
+ key32 = (uint32_t)k;
+ move16 = (uint16_t)m;
+ bound8 = (uint8_t)b;
+ generation8 = (uint8_t)g;
+ value16 = (int16_t)v;
+ depth16 = (int16_t)d;
+ evalValue = (int16_t)ev;
+ }
-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 {
- static const unsigned ClusterSize = 4; // A cluster is 64 Bytes
+ static const unsigned ClusterSize = 4;
public:
- ~TranspositionTable() { delete [] table; }
- void new_search() { generation++; }
+ ~TranspositionTable() { free(mem); }
+ 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 resize(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;
- uint8_t generation; // Size must be not bigger then TTEntry::generation8
+ void* mem;
+ uint8_t generation; // Size must be not bigger than TTEntry::generation8
};
extern TranspositionTable TT;
return table + ((uint32_t)key & hashMask);
}
-
-/// TranspositionTable::refresh() updates the 'generation' value of the TTEntry
-/// to avoid aging. 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