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Prefer ttMove to tte->move() in search()

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Avoids aliasing problems due to TT overwrites.

Node changes becuase of IID.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-05-16 10:59:51 +02:00
parent de58594b0f
commit 6624105b5b
1 changed files with 3 additions and 4 deletions
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7
src/search.cpp
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@ -871,8 +871,8 @@ namespace {
search<PvNode>(pos, ss, alpha, beta, d); search<PvNode>(pos, ss, alpha, beta, d);
ss->skipNullMove = false; ss->skipNullMove = false;
ttMove = ss->bestMove;
tte = TT.probe(posKey); tte = TT.probe(posKey);
ttMove = tte ? tte->move() : MOVE_NONE;
} }
split_point_start: // At split points actual search starts from here split_point_start: // At split points actual search starts from here
@ -885,8 +885,7 @@ split_point_start: // At split points actual search starts from here
singularExtensionNode = !Root singularExtensionNode = !Root
&& !SpNode && !SpNode
&& depth >= SingularExtensionDepth[PvNode] && depth >= SingularExtensionDepth[PvNode]
&& tte && ttMove != MOVE_NONE
&& tte->move()
&& !excludedMove // Do not allow recursive singular extension search && !excludedMove // Do not allow recursive singular extension search
&& (tte->type() & VALUE_TYPE_LOWER) && (tte->type() & VALUE_TYPE_LOWER)
&& tte->depth() >= depth - 3 * ONE_PLY; && tte->depth() >= depth - 3 * ONE_PLY;
@ -949,7 +948,7 @@ split_point_start: // At split points actual search starts from here
// on all the other moves but the ttMove, if result is lower than ttValue minus // on all the other moves but the ttMove, if result is lower than ttValue minus
// a margin then we extend ttMove. // a margin then we extend ttMove.
if ( singularExtensionNode if ( singularExtensionNode
&& move == tte->move() && move == ttMove
&& ext < ONE_PLY) && ext < ONE_PLY)
{ {
Value ttValue = value_from_tt(tte->value(), ss->ply); Value ttValue = value_from_tt(tte->value(), ss->ply);