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Code Issues Releases Wiki Activity

Retire eval optimization from null search

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Simplify things preparing for further changes.

bench: 4983282
This commit is contained in:
Marco Costalba 2012-12-01 14:48:13 +01:00
parent 4e5d834e8e
commit 69de670353
1 changed files with 2 additions and 9 deletions
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11
src/search.cpp
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@ -1105,7 +1105,7 @@ split_point_start: // At split points actual search starts from here
Key posKey;
Move ttMove, move, bestMove;
Value bestValue, value, ttValue, futilityValue, futilityBase, oldAlpha;
bool givesCheck, enoughMaterial, evasionPrunable, fromNull;
bool givesCheck, enoughMaterial, evasionPrunable;
Depth ttDepth;
// To flag BOUND_EXACT a node with eval above alpha and no available moves
@ -1114,7 +1114,6 @@ split_point_start: // At split points actual search starts from here
ss->currentMove = bestMove = MOVE_NONE;
ss->ply = (ss-1)->ply + 1;
fromNull = (ss-1)->currentMove == MOVE_NULL;
// Check for an instant draw or maximum ply reached
if (pos.is_draw<false, false>() || ss->ply > MAX_PLY)
@ -1152,12 +1151,7 @@ split_point_start: // At split points actual search starts from here
}
else
{
if (fromNull)
{
ss->staticEval = bestValue = -(ss-1)->staticEval;
ss->evalMargin = VALUE_ZERO;
}
else if (tte)
if (tte)
{
assert(tte->static_value() != VALUE_NONE || Threads.size() > 1);
@ -1205,7 +1199,6 @@ split_point_start: // At split points actual search starts from here
if ( !PvNode
&& !InCheck
&& !givesCheck
&& !fromNull
&& move != ttMove
&& enoughMaterial
&& type_of(move) != PROMOTION