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Consistently set ttMove to Rml.pv[0] in root node

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No functional change, but reduce risks of subtle aliasing bugs.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-08-02 22:11:19 +01:00
parent c50ad85c3c
commit 1e7c6fc761
1 changed files with 7 additions and 6 deletions
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13
src/search.cpp
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@ -775,7 +775,7 @@ namespace {
excludedMove = ss->excludedMove;
posKey = excludedMove ? pos.get_exclusion_key() : pos.get_key();
tte = TT.probe(posKey);
ttMove = tte ? tte->move() : MOVE_NONE;
ttMove = RootNode ? Rml[MultiPVIteration].pv[0] : tte ? tte->move() : MOVE_NONE;
// At PV nodes we check for exact scores, while at non-PV nodes we check for
// a fail high/low. Biggest advantage at probing at PV nodes is to have a
@ -946,7 +946,7 @@ namespace {
split_point_start: // At split points actual search starts from here
// Initialize a MovePicker object for the current position
MovePickerExt<NT> mp(pos, RootNode ? Rml[MultiPVIteration].pv[0] : ttMove, depth, H, ss, PvNode ? -VALUE_INFINITE : beta);
MovePickerExt<NT> mp(pos, ttMove, depth, H, ss, PvNode ? -VALUE_INFINITE : beta);
CheckInfo ci(pos);
ss->bestMove = MOVE_NONE;
futilityBase = ss->eval + ss->evalMargin;
@ -976,7 +976,7 @@ split_point_start: // At split points actual search starts from here
// At root obey the "searchmoves" option and skip moves not listed in Root Move List.
// Also in MultiPV mode we skip moves which already have got an exact score
// in previous MultiPV Iteration.
// in previous MultiPV Iteration. Finally any illegal move is skipped here.
if (RootNode && !Rml.find(move, MultiPVIteration))
continue;
@ -1011,11 +1011,12 @@ split_point_start: // At split points actual search starts from here
// For long searches send current move info to GUI
if (current_search_time() > 2000)
cout << "info" << depth_to_uci(depth)
<< " currmove " << move << " currmovenumber " << moveCount + MultiPVIteration << endl;
<< " currmove " << move
<< " currmovenumber " << moveCount + MultiPVIteration << endl;
}
// At Root and at first iteration do a PV search on all the moves to score root moves
isPvMove = (PvNode && moveCount <= ((RootNode && depth <= ONE_PLY) ? MAX_MOVES : 1));
isPvMove = (PvNode && moveCount <= (RootNode && depth <= ONE_PLY ? MAX_MOVES : 1));
givesCheck = pos.move_gives_check(move, ci);
captureOrPromotion = pos.move_is_capture_or_promotion(move);
@ -1222,7 +1223,7 @@ split_point_start: // At split points actual search starts from here
if (!isPvMove && MultiPV == 1)
Rml.bestMoveChanges++;
// Update alpha.
// Update alpha
if (value > alpha)
alpha = value;
}