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Simplify TT replace strategy

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Tested for no-regression with SPRT[-3, 1] at STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 32046 W: 6020 L: 5918 D: 20108

No functional change.
This commit is contained in:
Marco Costalba 2014-03-23 10:03:11 +01:00
parent e7362dae78
commit 865b71309c
1 changed files with 3 additions and 6 deletions
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9
src/tt.cpp
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@ -94,7 +94,6 @@ const TTEntry* TranspositionTable::probe(const Key key) const {
void TranspositionTable::store(const Key key, Value v, Bound b, Depth d, Move m, Value statV) {
int c1, c2, c3;
TTEntry *tte, *replace;
uint32_t key32 = key >> 32; // Use the high 32 bits as key inside the cluster
@ -112,11 +111,9 @@ void TranspositionTable::store(const Key key, Value v, Bound b, Depth d, Move m,
}
// Implement replace strategy
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)
if ( (replace->generation8 == generation) * 2
- (tte->generation8 == generation || tte->bound() == BOUND_EXACT) * 2
+ (tte->depth16 < replace->depth16) > 0)
replace = tte;
}