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Skip TT_MOVES phase when possible

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If we don't have tt moves to search skip the
useless loop associated with TT_MOVES phase.

Another 1% speed boost that brings this series
to a +6.2% against original revision 595a90df

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-08-30 17:17:44 +01:00
parent 607ac0687a
commit 1130c8d815
1 changed files with 5 additions and 3 deletions
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8
src/movepick.cpp
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@@ -61,10 +61,12 @@ namespace {
MovePicker::MovePicker(const Position& p, Move ttm, Depth d, MovePicker::MovePicker(const Position& p, Move ttm, Depth d,
const History& h, SearchStack* ss) : pos(p), H(h) { const History& h, SearchStack* ss) : pos(p), H(h) {
int searchTT = ttm;
ttMoves[0].move = ttm; ttMoves[0].move = ttm;
if (ss) if (ss)
{ {
ttMoves[1].move = (ss->mateKiller == ttm)? MOVE_NONE : ss->mateKiller; ttMoves[1].move = (ss->mateKiller == ttm)? MOVE_NONE : ss->mateKiller;
searchTT |= ttMoves[1].move;
killers[0].move = ss->killers[0]; killers[0].move = ss->killers[0];
killers[1].move = ss->killers[1]; killers[1].move = ss->killers[1];
} else } else
@@ -81,11 +83,11 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d,
if (p.is_check()) if (p.is_check())
phasePtr = EvasionsPhaseTable; phasePtr = EvasionsPhaseTable;
else if (d > Depth(0)) else if (d > Depth(0))
phasePtr = MainSearchPhaseTable; phasePtr = MainSearchPhaseTable + !searchTT;
else if (d == Depth(0)) else if (d == Depth(0))
phasePtr = QsearchWithChecksPhaseTable; phasePtr = QsearchWithChecksPhaseTable + !searchTT;
else else
phasePtr = QsearchWithoutChecksPhaseTable; phasePtr = QsearchWithoutChecksPhaseTable + !searchTT;
phasePtr--; phasePtr--;
go_next_phase(); go_next_phase();