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Rename TranspositionTable 'writes' in 'overwrites'

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Better documents what that variable means.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-06-28 08:20:34 +01:00
parent 5c3ebd1fbf
commit 6c0a37bbf2
2 changed files with 13 additions and 11 deletions
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20
src/tt.cpp
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@ -38,7 +38,7 @@ TranspositionTable TT;
TranspositionTable::TranspositionTable() { TranspositionTable::TranspositionTable() {
size = writes = 0; size = overwrites = 0;
entries = 0; entries = 0;
generation = 0; generation = 0;
} }
@ -100,6 +100,7 @@ void TranspositionTable::clear() {
void TranspositionTable::store(const Key posKey, Value v, ValueType t, Depth d, Move m, Value statV, Value kingD) { void TranspositionTable::store(const Key posKey, Value v, ValueType t, Depth d, Move m, Value statV, Value kingD) {
int c1, c2, c3;
TTEntry *tte, *replace; TTEntry *tte, *replace;
uint32_t posKey32 = posKey >> 32; // Use the high 32 bits as key uint32_t posKey32 = posKey >> 32; // Use the high 32 bits as key
@ -115,18 +116,19 @@ void TranspositionTable::store(const Key posKey, Value v, ValueType t, Depth d,
tte->save(posKey32, v, t, d, m, generation, statV, kingD); tte->save(posKey32, v, t, d, m, generation, statV, kingD);
return; return;
} }
else if (i == 0) // replace would be a no-op in this common case
if (i == 0) // replace would be a no-op in this common case
continue; continue;
int c1 = (replace->generation() == generation ? 2 : 0); c1 = (replace->generation() == generation ? 2 : 0);
int c2 = (tte->generation() == generation ? -2 : 0); c2 = (tte->generation() == generation ? -2 : 0);
int c3 = (tte->depth() < replace->depth() ? 1 : 0); c3 = (tte->depth() < replace->depth() ? 1 : 0);
if (c1 + c2 + c3 > 0) if (c1 + c2 + c3 > 0)
replace = tte; replace = tte;
} }
replace->save(posKey32, v, t, d, m, generation, statV, kingD); replace->save(posKey32, v, t, d, m, generation, statV, kingD);
writes++; overwrites++;
} }
@ -155,7 +157,7 @@ TTEntry* TranspositionTable::retrieve(const Key posKey) const {
void TranspositionTable::new_search() { void TranspositionTable::new_search() {
generation++; generation++;
writes = 0; overwrites = 0;
} }
@ -214,11 +216,11 @@ void TranspositionTable::extract_pv(const Position& pos, Move bestMove, Move pv[
/// TranspositionTable::full() returns the permill of all transposition table /// TranspositionTable::full() returns the permill of all transposition table
/// entries which have received at least one write during the current search. /// entries which have received at least one overwrite during the current search.
/// It is used to display the "info hashfull ..." information in UCI. /// It is used to display the "info hashfull ..." information in UCI.
int TranspositionTable::full() const { int TranspositionTable::full() const {
double N = double(size) * ClusterSize; double N = double(size) * ClusterSize;
return int(1000 * (1 - exp(writes * log(1.0 - 1.0/N)))); return int(1000 * (1 - exp(overwrites * log(1.0 - 1.0/N))));
} }

4
src/tt.h
View file

@ -115,10 +115,10 @@ public:
TTEntry* first_entry(const Key posKey) const; TTEntry* first_entry(const Key posKey) const;
private: private:
// Be sure 'writes' is at least one cache line away // Be sure 'overwrites' is at least one cache line away
// from read only variables. // from read only variables.
unsigned char pad_before[64 - sizeof(unsigned)]; unsigned char pad_before[64 - sizeof(unsigned)];
unsigned writes; // heavy SMP read/write access here unsigned overwrites; // heavy SMP read/write access here
unsigned char pad_after[64]; unsigned char pad_after[64];
size_t size; size_t size;