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Avoid searching TT twice for the same key/position during probe() and store().

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Just keep the pointer and remove code from tt.cpp

STC
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 13620 W: 2810 L: 2665 D: 8145

LTC
LLR: 2.97 (-2.94,2.94) [0.00,6.00]
Total: 13021 W: 2238 L: 2073 D: 8710STC http://tests.stockfishchess.org/tests/view/548436860ebc59331739b90c

STC 4MB
ELO: 2.41 +-2.2 (95%) LOS: 98.6%
Total: 40000 W: 8175 L: 7897 D: 23928

LTC 16MB
ELO: 1.78 +-2.0 (95%) LOS: 96.1%
Total: 39683 W: 6763 L: 6560 D: 26360

Resolves #151

Bench: 8116521
This commit is contained in:
mstembera
2014-12-13 07:16:35 +00:00
committed by Joona Kiiski
parent 7b4828b68c
commit 14cf27e6f6
3 changed files with 67 additions and 81 deletions
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29
src/tt.h
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@@ -41,19 +41,21 @@ struct TTEntry {
Depth depth() const { return (Depth)depth8; }
Bound bound() const { return (Bound)(genBound8 & 0x3); }
void save(Key k, Value v, Bound b, Depth d, Move m, Value ev, uint8_t g) {
k >>= 48;
if (m || k != key16) // preserve any existing ttMove
move16 = (uint16_t)m;
key16 = (uint16_t)k;
value16 = (int16_t)v;
evalValue = (int16_t)ev;
genBound8 = (uint8_t)(g | b);
depth8 = (int8_t)d;
}
private:
friend class TranspositionTable;
void save(uint16_t k, Value v, Bound b, Depth d, Move m, uint8_t g, Value ev) {
key16 = (uint16_t)k;
move16 = (uint16_t)m;
value16 = (int16_t)v;
evalValue = (int16_t)ev;
genBound8 = (uint8_t)(g | b);
depth8 = (int8_t)d;
}
uint16_t key16;
uint16_t move16;
int16_t value16;
@@ -67,7 +69,7 @@ private:
/// 3 x TTEntry (3 x 10 bytes)
/// padding (2 bytes)
const unsigned TTClusterSize = 3;
static const unsigned TTClusterSize = 3;
struct TTCluster {
TTEntry entry[TTClusterSize];
@@ -85,12 +87,11 @@ class TranspositionTable {
public:
~TranspositionTable() { free(mem); }
void new_search() { generation += 4; } // Lower 2 bits are used by Bound
const TTEntry* probe(const Key key) const;
uint8_t get_generation() const { return generation; }
TTEntry* probe(const Key key, bool& found) const;
TTEntry* first_entry(const Key key) const;
void resize(size_t mbSize);
void clear();
void store(const Key key, Value v, Bound type, Depth d, Move m, Value statV);
private:
size_t clusterCount;