X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Ftt.h;h=69cdad0c17dc19f19d351a36e0b79faf5e696700;hp=ee10b3f0d9e28bbedd0e892b13cccfb5c8a58538;hb=339e1b49f619ceffa75019e196adf4de74b32cce;hpb=200fc56e9ce2ce5b879b0cae8268703f041c40b2 diff --git a/src/tt.h b/src/tt.h index ee10b3f0..69cdad0c 100644 --- a/src/tt.h +++ b/src/tt.h @@ -17,24 +17,16 @@ along with this program. If not, see . */ - #if !defined(TT_H_INCLUDED) #define TT_H_INCLUDED -//// -//// Includes -//// +#include -#include "depth.h" #include "move.h" -#include "value.h" - +#include "types.h" -//// -//// Types -//// -/// The TTEntry class is the class of transposition table entries +/// The TTEntry is the class of transposition table entries /// /// A TTEntry needs 128 bits to be stored /// @@ -47,59 +39,59 @@ /// /// the 32 bits of the data field are so defined /// -/// bit 0-16: move -/// bit 17-20: not used +/// bit 0-15: move +/// bit 16-20: not used /// bit 21-22: value type /// bit 23-31: generation class TTEntry { public: - void save(uint32_t k, Value v, ValueType t, Depth d, Move m, int g, Value statV, Value kd) { - - key32 = k; - data = (m & 0x1FFFF) | (t << 21) | (g << 23); - value16 = int16_t(v); - depth16 = int16_t(d); - staticValue = int16_t(statV); - staticValueMargin = int16_t(kd); + void save(uint32_t k, Value v, ValueType t, Depth d, Move m, int g, Value statV, Value statM) { + + key32 = (uint32_t)k; + move16 = (uint16_t)m; + valueType = (uint8_t)t; + generation8 = (uint8_t)g; + value16 = (int16_t)v; + depth16 = (int16_t)d; + staticValue = (int16_t)statV; + staticMargin = (int16_t)statM; } - void set_generation(int g) { data = move() | (type() << 21) | (g << 23); } + void set_generation(int g) { generation8 = (uint8_t)g; } - uint32_t key() const { return key32; } - Depth depth() const { return Depth(depth16); } - Move move() const { return Move(data & 0x1FFFF); } - Value value() const { return Value(value16); } - ValueType type() const { return ValueType((data >> 21) & 3); } - int generation() const { return data >> 23; } - Value static_value() const { return Value(staticValue); } - Value static_value_margin() const { return Value(staticValueMargin); } + uint32_t key() const { return key32; } + Depth depth() const { return (Depth)depth16; } + Move move() const { return (Move)move16; } + Value value() const { return (Value)value16; } + ValueType type() const { return (ValueType)valueType; } + int generation() const { return (int)generation8; } + Value static_value() const { return (Value)staticValue; } + Value static_value_margin() const { return (Value)staticMargin; } private: uint32_t key32; - uint32_t data; - int16_t value16; - int16_t depth16; - int16_t staticValue; - int16_t staticValueMargin; + uint16_t move16; + uint8_t valueType, generation8; + int16_t value16, depth16, staticValue, staticMargin; }; /// This is the number of TTEntry slots for each cluster const int ClusterSize = 4; -/// TTCluster consists of ClusterSize number of TTEntries. -/// Size of TTCluster must not be bigger than a cache line size. -/// In case it is less, it should be padded to guarantee always aligned accesses. + +/// TTCluster consists of ClusterSize number of TTEntries. Size of TTCluster +/// must not be bigger than a cache line size. In case it is less, it should +/// be padded to guarantee always aligned accesses. struct TTCluster { TTEntry data[ClusterSize]; }; -/// The transposition table class. This is basically just a huge array -/// containing TTCluster objects, and a few methods for writing new entries -/// and reading new ones. +/// The transposition table class. This is basically just a huge array containing +/// TTCluster objects, and a few methods for writing and reading entries. class TranspositionTable { @@ -120,28 +112,62 @@ public: private: size_t size; TTCluster* entries; - uint8_t generation; // To properly compare, size must be smaller then TT stored value + uint8_t generation; // Size must be not bigger then TTEntry::generation8 }; extern TranspositionTable TT; -/// TranspositionTable::first_entry returns a pointer to the first -/// entry of a cluster given a position. The lowest order bits of the key -/// are used to get the index of the cluster. +/// TranspositionTable::first_entry() returns a pointer to the first entry of +/// a cluster given a position. The lowest order bits of the key are used to +/// get the index of the cluster. inline TTEntry* TranspositionTable::first_entry(const Key posKey) const { - return entries[uint32_t(posKey) & (size - 1)].data; + return entries[((uint32_t)posKey) & (size - 1)].data; } -/// TranspositionTable::refresh updates the 'generation' value of the TTEntry -/// to avoid aging. Normally called after a TT hit, before to return. +/// 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(tte)->set_generation(generation); } + +/// A simple fixed size hash table used to store pawns and material +/// configurations. It is basically just an array of Entry objects. +/// Without cluster concept or overwrite policy. + +template +struct SimpleHash { + + typedef SimpleHash Base; + + void init() { + + if (entries) + return; + + entries = new (std::nothrow) Entry[HashSize]; + if (!entries) + { + std::cerr << "Failed to allocate " << HashSize * sizeof(Entry) + << " bytes for hash table." << std::endl; + exit(EXIT_FAILURE); + } + memset(entries, 0, HashSize * sizeof(Entry)); + } + + virtual ~SimpleHash() { delete [] entries; } + + Entry* find(Key key) const { return entries + ((uint32_t)key & (HashSize - 1)); } + void prefetch(Key key) const { ::prefetch((char*)find(key)); } + +protected: + Entry* entries; +}; + #endif // !defined(TT_H_INCLUDED)