2008-08-31 23:59:13 -06:00
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/*
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2008-10-19 10:56:28 -06:00
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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2010-03-20 04:27:07 -06:00
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Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
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2008-08-31 23:59:13 -06:00
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2008-10-19 10:56:28 -06:00
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Stockfish is free software: you can redistribute it and/or modify
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2008-08-31 23:59:13 -06:00
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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2008-09-06 04:30:07 -06:00
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2008-10-19 10:56:28 -06:00
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Stockfish is distributed in the hope that it will be useful,
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2008-08-31 23:59:13 -06:00
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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2008-09-06 04:30:07 -06:00
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2008-08-31 23:59:13 -06:00
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined(TT_H_INCLUDED)
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#define TT_H_INCLUDED
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////
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//// Includes
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////
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#include "depth.h"
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#include "move.h"
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#include "value.h"
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////
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//// Types
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////
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2009-03-30 01:29:02 -06:00
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/// The TTEntry class is the class of transposition table entries
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///
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/// A TTEntry needs 128 bits to be stored
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///
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/// bit 0-31: key
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/// bit 32-63: data
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/// bit 64-79: value
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/// bit 80-95: depth
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/// bit 96-111: static value
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/// bit 112-127: margin of static value
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///
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/// the 32 bits of the data field are so defined
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///
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/// bit 0-16: move
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/// bit 17-20: not used
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/// bit 21-22: value type
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/// bit 23-31: generation
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class TTEntry {
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public:
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void save(uint32_t k, Value v, ValueType t, Depth d, Move m, int g, Value statV, Value kd) {
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key32 = k;
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data = (m & 0x1FFFF) | (t << 21) | (g << 23);
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value16 = (int16_t)v;
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depth16 = (int16_t)d;
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staticValue = (int16_t)statV;
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staticValueMargin = (int16_t)kd;
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}
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void set_generation(int g) { data = move() | (type() << 21) | (g << 23); }
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uint32_t key() const { return key32; }
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Depth depth() const { return Depth(depth16); }
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Move move() const { return Move(data & 0x1FFFF); }
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Value value() const { return Value(value16); }
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ValueType type() const { return ValueType((data >> 21) & 3); }
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int generation() const { return data >> 23; }
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Value static_value() const { return Value(staticValue); }
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Value static_value_margin() const { return Value(staticValueMargin); }
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private:
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uint32_t key32;
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uint32_t data;
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int16_t value16;
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int16_t depth16;
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int16_t staticValue;
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int16_t staticValueMargin;
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};
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/// This is the number of TTEntry slots for each cluster
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const int ClusterSize = 4;
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/// TTCluster consists of ClusterSize number of TTEntries.
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/// Size of TTCluster must not be bigger than a cache line size.
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/// In case it is less, it should be padded to guarantee always aligned accesses.
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struct TTCluster {
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TTEntry data[ClusterSize];
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};
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/// The transposition table class. This is basically just a huge array
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/// containing TTCluster objects, and a few methods for writing new entries
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/// and reading new ones.
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class TranspositionTable {
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TranspositionTable(const TranspositionTable&);
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TranspositionTable& operator=(const TranspositionTable&);
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public:
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TranspositionTable();
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~TranspositionTable();
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void set_size(size_t mbSize);
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void clear();
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void store(const Key posKey, Value v, ValueType type, Depth d, Move m, Value statV, Value kingD);
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TTEntry* retrieve(const Key posKey) const;
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void new_search();
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TTEntry* first_entry(const Key posKey) const;
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void refresh(const TTEntry* tte) const;
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private:
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size_t size;
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TTCluster* entries;
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uint8_t generation; // To properly compare, size must be smaller then TT stored value
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};
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extern TranspositionTable TT;
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/// TranspositionTable::first_entry returns a pointer to the first
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/// entry of a cluster given a position. The lowest order bits of the key
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/// are used to get the index of the cluster.
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inline TTEntry* TranspositionTable::first_entry(const Key posKey) const {
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return entries[((uint32_t)posKey) & (size - 1)].data;
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}
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/// TranspositionTable::refresh updates the 'generation' value of the TTEntry
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/// to avoid aging. Normally called after a TT hit, before to return.
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inline void TranspositionTable::refresh(const TTEntry* tte) const {
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const_cast<TTEntry*>(tte)->set_generation(generation);
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}
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2008-08-31 23:59:13 -06:00
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#endif // !defined(TT_H_INCLUDED)
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