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Refresh TT entries generation automatically on probe

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And other assorted simplifications, tested with SPRT[-3, 1]

Passed both short TC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 18814 W: 3600 L: 3475 D: 11739

And long TC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 20731 W: 3217 L: 3096 D: 14418

No functional change.
This commit is contained in:
mstembera
2014-03-23 09:24:35 +01:00
committed by Marco Costalba
parent f12449d492
commit ffdf63ff7c
3 changed files with 24 additions and 32 deletions
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15
src/tt.cpp
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@@ -70,12 +70,15 @@ void TranspositionTable::clear() {
const TTEntry* TranspositionTable::probe(const Key key) const {
const TTEntry* tte = first_entry(key);
TTEntry* tte = first_entry(key);
uint32_t key32 = key >> 32;
for (unsigned i = 0; i < ClusterSize; ++i, ++tte)
if (tte->key() == key32)
if (tte->key32 == key32)
{
tte->generation8 = generation; // Refresh
return tte;
}
return NULL;
}
@@ -99,7 +102,7 @@ void TranspositionTable::store(const Key key, Value v, Bound b, Depth d, Move m,
for (unsigned i = 0; i < ClusterSize; ++i, ++tte)
{
if (!tte->key() || tte->key() == key32) // Empty or overwrite old
if (!tte->key32 || tte->key32 == key32) // Empty or overwrite old
{
if (!m)
m = tte->move(); // Preserve any existing ttMove
@@ -109,9 +112,9 @@ void TranspositionTable::store(const Key key, Value v, Bound b, Depth d, Move m,
}
// Implement replace strategy
c1 = (replace->generation() == generation ? 2 : 0);
c2 = (tte->generation() == generation || tte->bound() == BOUND_EXACT ? -2 : 0);
c3 = (tte->depth() < replace->depth() ? 1 : 0);
c1 = (replace->generation8 == generation ? 2 : 0);
c2 = (tte->generation8 == generation || tte->bound() == BOUND_EXACT ? -2 : 0);
c3 = (tte->depth16 < replace->depth16 ? 1 : 0);
if (c1 + c2 + c3 > 0)
replace = tte;