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Delay sorting of negative scored non-captures

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We can do this only when needed, if we get a cut-off
before we skip sorting entirely. This reduces sorting
time of about 20%.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-02-05 18:17:52 +01:00
parent 69644d3f73
commit c7866a4215
3 changed files with 10 additions and 5 deletions
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7
src/movepick.cpp
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@@ -136,7 +136,7 @@ void MovePicker::go_next_phase() {
case PH_NONCAPTURES:
lastMove = generate_noncaptures(pos, moves);
score_noncaptures();
sort_moves(moves, lastMove);
sort_moves(moves, lastMove, &lastGoodNonCapture);
return;
case PH_BAD_CAPTURES:
@@ -305,6 +305,11 @@ Move MovePicker::get_next_move() {
break;
case PH_NONCAPTURES:
// Sort negative scored moves only when we get there
if (curMove == lastGoodNonCapture)
insertion_sort(lastGoodNonCapture, lastMove);
move = (curMove++)->move;
if ( move != ttMoves[0].move
&& move != ttMoves[1].move