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Reduce writes in TT::probe().

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Only refresh TT entry when it's really necessary.
This should give a small speed boost for some machines.
And it's a risk-free change.

No functional change.

Resolves #429
This commit is contained in:
mstembera
2015-09-15 13:28:42 -07:00
committed by Joona Kiiski
parent 01fab4d432
commit 68fbb1e052
1 changed files with 1 additions and 1 deletions
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src/tt.cpp
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@@ -78,7 +78,7 @@ TTEntry* TranspositionTable::probe(const Key key, bool& found) const {
for (int i = 0; i < ClusterSize; ++i) for (int i = 0; i < ClusterSize; ++i)
if (!tte[i].key16 || tte[i].key16 == key16) if (!tte[i].key16 || tte[i].key16 == key16)
{ {
if (tte[i].key16) if ((tte[i].genBound8 & 0xFC) != generation8 && tte[i].key16)
tte[i].genBound8 = uint8_t(generation8 | tte[i].bound()); // Refresh tte[i].genBound8 = uint8_t(generation8 | tte[i].bound()); // Refresh
return found = (bool)tte[i].key16, &tte[i]; return found = (bool)tte[i].key16, &tte[i];