TranspositionTable TT; // Our global transposition table
-TranspositionTable::TranspositionTable() {
-
- size = generation = 0;
- entries = NULL;
-}
-
-TranspositionTable::~TranspositionTable() {
-
- delete [] entries;
-}
-
/// TranspositionTable::set_size() sets the size of the transposition table,
-/// measured in megabytes. Transposition table consists of a power of 2 number of
-/// TTCluster and each cluster consists of ClusterSize number of TTEntries. Each
-/// non-empty entry contains information of exactly one position.
+/// measured in megabytes. Transposition table consists of a power of 2 number
+/// of clusters and each cluster consists of ClusterSize number of TTEntry.
void TranspositionTable::set_size(size_t mbSize) {
- size_t newSize = 1ULL << msb((mbSize << 20) / sizeof(TTCluster));
+ assert(msb((mbSize << 20) / sizeof(TTEntry)) < 32);
- if (newSize == size)
+ uint32_t size = ClusterSize << msb((mbSize << 20) / sizeof(TTEntry[ClusterSize]));
+
+ if (hashMask == size - ClusterSize)
return;
- size = newSize;
- delete [] entries;
- entries = new (std::nothrow) TTCluster[size];
+ hashMask = size - ClusterSize;
+ delete [] table;
+ table = new (std::nothrow) TTEntry[size];
- if (!entries)
+ if (!table)
{
std::cerr << "Failed to allocate " << mbSize
<< "MB for transposition table." << std::endl;
void TranspositionTable::clear() {
- memset(entries, 0, size * sizeof(TTCluster));
+ memset(table, 0, (hashMask + ClusterSize) * sizeof(TTEntry));
}
/// more valuable than a TTEntry t2 if t1 is from the current search and t2 is from
/// a previous search, or if the depth of t1 is bigger than the depth of t2.
-void TranspositionTable::store(const Key posKey, Value v, Bound b, Depth d, Move m) {
+void TranspositionTable::store(const Key key, Value v, Bound t, Depth d, Move m, Value statV, Value kingD) {
int c1, c2, c3;
TTEntry *tte, *replace;
- uint32_t posKey32 = posKey >> 32; // Use the high 32 bits as key inside the cluster
+ uint32_t key32 = key >> 32; // Use the high 32 bits as key inside the cluster
- tte = replace = first_entry(posKey);
+ tte = replace = first_entry(key);
- for (int i = 0; i < ClusterSize; i++, tte++)
+ for (unsigned i = 0; i < ClusterSize; i++, tte++)
{
- if (!tte->key())
- tte->save(posKey32, v, b, d, m, generation);
-
- if (tte->key() == posKey32)
+ if (!tte->key() || tte->key() == key32) // Empty or overwrite old
{
// Preserve any existing ttMove
if (m == MOVE_NONE)
m = tte->move();
- tte->update(v, b, d, m, generation);
+ tte->save(key32, v, t, d, m, generation, statV, kingD);
return;
}
if (c1 + c2 + c3 > 0)
replace = tte;
}
- replace->save(posKey32, v, b, d, m, generation);
+ replace->save(key32, v, t, d, m, generation, statV, kingD);
}
/// transposition table. Returns a pointer to the TTEntry or NULL if
/// position is not found.
-TTEntry* TranspositionTable::probe(const Key posKey) const {
+TTEntry* TranspositionTable::probe(const Key key) const {
- uint32_t posKey32 = posKey >> 32;
- TTEntry* tte = first_entry(posKey);
+ TTEntry* tte = first_entry(key);
+ uint32_t key32 = key >> 32;
- for (int i = 0; i < ClusterSize; i++, tte++)
- if (tte->key() == posKey32)
+ for (unsigned i = 0; i < ClusterSize; i++, tte++)
+ if (tte->key() == key32)
return tte;
return NULL;
}
-
-
-/// TranspositionTable::new_search() is called at the beginning of every new
-/// search. It increments the "generation" variable, which is used to
-/// distinguish transposition table entries from previous searches from
-/// entries from the current search.
-
-void TranspositionTable::new_search() {
- generation++;
-}