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MovePicker: avoid calling see() for LxH and equal captures

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No functional change but should speed-up the captures scoring.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-12-05 12:00:30 +01:00
parent b4fcfed55b
commit 32934c0c8d
1 changed files with 14 additions and 3 deletions
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17
src/movepick.cpp
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@ -228,18 +228,29 @@ void MovePicker::score_captures() {
// to the badCaptures[] array.
Move m;
int seeValue;
Square from, to;
for (int i = 0; i < numOfMoves; i++)
{
m = moves[i].move;
seeValue = pos.see(m);
from = move_from(m);
to = move_to(m);
bool hxl = ( int(pos.midgame_value_of_piece_on(from))
-int(pos.midgame_value_of_piece_on(to)) > 0)
|| pos.type_of_piece_on(from) == KING;
// Avoid calling see() for LxH and equal captures because
// SEE is always >= 0 and we order for MVV/LVA anyway.
seeValue = (hxl ? pos.see(m) : 0);
if (seeValue >= 0)
{
if (move_promotion(m))
moves[i].score = QueenValueMidgame;
else
moves[i].score = int(pos.midgame_value_of_piece_on(move_to(m)))
-int(pos.type_of_piece_on(move_from(m)));
moves[i].score = int(pos.midgame_value_of_piece_on(to))
-int(pos.type_of_piece_on(from));
}
else
{