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Avoid calling evaluate() while razoring

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Micro optimization that gives a 0.5% speed improvment

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-06-05 09:40:47 +02:00
parent a04dcce628
commit 287b46aa63
1 changed files with 4 additions and 0 deletions
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4
src/search.cpp
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@ -1148,6 +1148,10 @@ namespace {
&& !value_is_mate(beta)
&& !pos.has_pawn_on_7th(pos.side_to_move()))
{
// Pass ss->eval to qsearch() and avoid an evaluate call
if (!tte || tte->static_value() == VALUE_NONE)
TT.store(posKey, ss->eval, VALUE_TYPE_EXACT, Depth(-127*OnePly), MOVE_NONE, ss->eval, ei.kingDanger[pos.side_to_move()]);
Value rbeta = beta - razor_margin(depth);
Value v = qsearch<NonPV>(pos, ss, rbeta-1, rbeta, Depth(0));
if (v < rbeta)