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Do not sort negative non captures at low depth

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Speedup of the whole 3 patch series is of 2,5% !!

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-06-04 06:25:16 +01:00
parent 811037c845
commit 8647fbd6ed
2 changed files with 4 additions and 2 deletions
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5
src/movepick.cpp
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@@ -56,7 +56,7 @@ namespace {
/// move ordering is at the current node. /// move ordering is at the current node.
MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h, MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h,
SearchStack* ss, Value beta) : pos(p), H(h) { SearchStack* ss, Value beta) : pos(p), H(h), depth(d) {
captureThreshold = 0; captureThreshold = 0;
badCaptures = moves + MAX_MOVES; badCaptures = moves + MAX_MOVES;
@@ -162,7 +162,8 @@ void MovePicker::go_next_phase() {
case PH_NONCAPTURES_2: case PH_NONCAPTURES_2:
curMove = lastMove; curMove = lastMove;
lastMove = lastNonCapture; lastMove = lastNonCapture;
insertion_sort<MoveStack>(curMove, lastMove); if (depth >= 3 * ONE_PLY)
insertion_sort<MoveStack>(curMove, lastMove);
return; return;
case PH_BAD_CAPTURES: case PH_BAD_CAPTURES:

1
src/movepick.h
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@@ -53,6 +53,7 @@ private:
const Position& pos; const Position& pos;
const History& H; const History& H;
Depth depth;
Move ttMove; Move ttMove;
MoveStack killers[2]; MoveStack killers[2];
int captureThreshold, phase; int captureThreshold, phase;