mirror of
https://github.com/sockspls/badfish
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630fda2e2c
Move TT object away from heavy write accessed NodesSincePoll and also, inside TT isolate the heavy accessed writes variable. No functional change. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
106 lines
2.8 KiB
C++
106 lines
2.8 KiB
C++
/*
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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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Copyright (C) 2008-2009 Marco Costalba
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Stockfish is free software: you can redistribute it and/or modify
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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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Stockfish is distributed in the hope that it will be useful,
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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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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 "position.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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/// 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 0-63: key
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/// bit 64-95: data
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/// bit 96-111: value
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/// bit 112-127: depth
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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 17-19: not used
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/// bit 20-22: 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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TTEntry() {}
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TTEntry(Key k, Value v, ValueType t, Depth d, Move m, int generation)
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: key_ (k), data((m & 0x1FFFF) | (t << 20) | (generation << 23)),
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value_(int16_t(v)), depth_(int16_t(d)) {}
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Key key() const { return key_; }
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Depth depth() const { return Depth(depth_); }
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Move move() const { return Move(data & 0x1FFFF); }
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Value value() const { return Value(value_); }
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ValueType type() const { return ValueType((data >> 20) & 7); }
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int generation() const { return (data >> 23); }
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private:
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Key key_;
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uint32_t data;
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int16_t value_;
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int16_t depth_;
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};
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/// The transposition table class. This is basically just a huge array
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/// containing TTEntry 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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public:
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TranspositionTable();
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~TranspositionTable();
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void set_size(unsigned mbSize);
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void clear();
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void store(const Key posKey, Value v, ValueType type, Depth d, Move m);
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TTEntry* retrieve(const Key posKey) const;
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void new_search();
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void insert_pv(const Position& pos, Move pv[]);
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int full() const;
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private:
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inline TTEntry* first_entry(const Key posKey) const;
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// Be sure 'writes' is at least one cacheline away
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// from read only variables.
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unsigned char pad_before[64 - sizeof(unsigned)];
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unsigned writes; // heavy SMP read/write access here
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unsigned char pad_after[64];
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unsigned size;
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TTEntry* entries;
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uint8_t generation;
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};
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#endif // !defined(TT_H_INCLUDED)
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