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Optimize futilityValue calculation

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Avoid calling evaluate() if we already have the score in TT

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-09-30 14:38:40 +02:00
parent e677185567
commit a6c6037813
1 changed files with 4 additions and 0 deletions
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4
src/search.cpp
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@ -1333,6 +1333,10 @@ namespace {
bool useFutilityPruning = depth < SelectiveDepth bool useFutilityPruning = depth < SelectiveDepth
&& !isCheck; && !isCheck;
// Avoid calling evaluate() if we already have the score in TT
if (tte && (tte->type() & VALUE_TYPE_EVAL))
futilityValue = value_from_tt(tte->value(), ply) + FutilityMargins[int(depth) - 2];
// Loop through all legal moves until no moves remain or a beta cutoff // Loop through all legal moves until no moves remain or a beta cutoff
// occurs. // occurs.
while ( bestValue < beta while ( bestValue < beta