X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Ftt.cpp;h=97ca23dc43a6ab3c926520f0194235533815c68f;hp=268c21f896ab3c89e962ae6dde36c9001030231b;hb=787d3585548ed7dac06597780a7d0adb64482d41;hpb=c2c0ba875f429e497c936b61be9f75dcc88385a9 diff --git a/src/tt.cpp b/src/tt.cpp index 268c21f8..97ca23dc 100644 --- a/src/tt.cpp +++ b/src/tt.cpp @@ -1,13 +1,14 @@ /* - Glaurung, a UCI chess playing engine. - Copyright (C) 2004-2008 Tord Romstad + Stockfish, a UCI chess playing engine derived from Glaurung 2.1 + Copyright (C) 2004-2008 Tord Romstad (Glaurung author) + Copyright (C) 2008 Marco Costalba - Glaurung is free software: you can redistribute it and/or modify + Stockfish is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. - Glaurung is distributed in the hope that it will be useful, + Stockfish is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. @@ -23,6 +24,7 @@ #include #include +#include #include "tt.h" @@ -136,29 +138,19 @@ void TranspositionTable::store(const Position &pos, Value v, Depth d, /// TranspositionTable::retrieve looks up the current position in the -/// transposition table, and extracts the value, value type, depth and -/// best move if the position is found. The return value is true if -/// the position is found, and false if it isn't. +/// transposition table. Returns a pointer to the TTEntry or NULL +/// if position is not found. + +const TTEntry* TranspositionTable::retrieve(const Position &pos) const { -bool TranspositionTable::retrieve(const Position &pos, Value *value, - Depth *d, Move *move, - ValueType *type) const { TTEntry *tte = first_entry(pos); - for (int i = 0; i < 4; i++) + for (int i = 0; i < 4; i++, tte++) { - tte += i; if (tte->key() == pos.get_key()) - { - *value = tte->value(); - *type = tte->type(); - *d = tte->depth(); - *move = tte->move(); - return true; - } + return tte; } - *move = MOVE_NONE; - return false; + return NULL; } @@ -222,28 +214,4 @@ TTEntry::TTEntry(Key k, Value v, ValueType t, Depth d, Move m, value_(v), depth_(int16_t(d)) {} -/// Functions for extracting data from TTEntry objects. - -inline Key TTEntry::key() const { - return key_; -} -inline Depth TTEntry::depth() const { - return Depth(depth_); -} - -inline Move TTEntry::move() const { - return Move(data & 0x7FFFF); -} - -inline Value TTEntry::value() const { - return Value(value_); -} - -inline ValueType TTEntry::type() const { - return ValueType((data >> 20) & 3); -} - -inline int TTEntry::generation() const { - return (data >> 23); -}