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Code Issues Releases Wiki Activity

Move singleEvasion assignment out of move's loop

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We don't need to recheck after every move.

Spotted by Ralph Stoesser.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-07-01 22:18:53 +01:00
parent b24a2dfc72
commit 971c591be7
1 changed files with 7 additions and 7 deletions
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14
src/search.cpp
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@ -1061,7 +1061,7 @@ namespace {
Depth ext, newDepth; Depth ext, newDepth;
Value bestValue, value, oldAlpha; Value bestValue, value, oldAlpha;
Value refinedValue, nullValue, futilityValueScaled; // Non-PV specific Value refinedValue, nullValue, futilityValueScaled; // Non-PV specific
bool isCheck, singleEvasion, moveIsCheck, captureOrPromotion, dangerous; bool isCheck, singleEvasion, singularExtensionNode, moveIsCheck, captureOrPromotion, dangerous;
bool mateThreat = false; bool mateThreat = false;
int moveCount = 0; int moveCount = 0;
int threadID = pos.thread(); int threadID = pos.thread();
@ -1257,11 +1257,12 @@ namespace {
// Initialize a MovePicker object for the current position // Initialize a MovePicker object for the current position
MovePicker mp = MovePicker(pos, ttMove, depth, H, ss, (PvNode ? -VALUE_INFINITE : beta)); MovePicker mp = MovePicker(pos, ttMove, depth, H, ss, (PvNode ? -VALUE_INFINITE : beta));
CheckInfo ci(pos); CheckInfo ci(pos);
bool singularExtensionNode = depth >= SingularExtensionDepth[PvNode] singleEvasion = isCheck && mp.number_of_evasions() == 1;
&& tte && tte->move() singularExtensionNode = depth >= SingularExtensionDepth[PvNode]
&& !excludedMove // Do not allow recursive singular extension search && tte && tte->move()
&& is_lower_bound(tte->type()) && !excludedMove // Do not allow recursive singular extension search
&& tte->depth() >= depth - 3 * OnePly; && is_lower_bound(tte->type())
&& tte->depth() >= depth - 3 * OnePly;
// Step 10. Loop through moves // Step 10. Loop through moves
// Loop through all legal moves until no moves remain or a beta cutoff occurs // Loop through all legal moves until no moves remain or a beta cutoff occurs
@ -1274,7 +1275,6 @@ namespace {
if (move == excludedMove) if (move == excludedMove)
continue; continue;
singleEvasion = (isCheck && mp.number_of_evasions() == 1);
moveIsCheck = pos.move_is_check(move, ci); moveIsCheck = pos.move_is_check(move, ci);
captureOrPromotion = pos.move_is_capture_or_promotion(move); captureOrPromotion = pos.move_is_capture_or_promotion(move);