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MovePicker: simplify move swapping

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We don't need a full swap here because once found
and returned the best move will not be used again.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2008-09-18 09:51:24 +01:00
parent 5080e72ea5
commit 52487c4f04
1 changed files with 8 additions and 17 deletions
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25
src/movepick.cpp
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@@ -335,10 +335,8 @@ Move MovePicker::pick_move_from_list() {
} }
} }
if(bestIndex != -1) { // Found a good capture if(bestIndex != -1) { // Found a good capture
MoveStack tmp = moves[movesPicked]; move = moves[bestIndex].move;
moves[movesPicked] = moves[bestIndex]; moves[bestIndex] = moves[movesPicked++];
moves[bestIndex] = tmp;
move = moves[movesPicked++].move;
if(move != ttMove && move != mateKiller && if(move != ttMove && move != mateKiller &&
pos->move_is_legal(move, pinned)) pos->move_is_legal(move, pinned))
return move; return move;
@@ -368,10 +366,8 @@ Move MovePicker::pick_move_from_list() {
bestIndex = movesPicked; bestIndex = movesPicked;
if(bestIndex != -1) { if(bestIndex != -1) {
MoveStack tmp = moves[movesPicked]; move = moves[bestIndex].move;
moves[movesPicked] = moves[bestIndex]; moves[bestIndex] = moves[movesPicked++];
moves[bestIndex] = tmp;
move = moves[movesPicked++].move;
if(move != ttMove && move != mateKiller && if(move != ttMove && move != mateKiller &&
pos->move_is_legal(move, pinned)) pos->move_is_legal(move, pinned))
return move; return move;
@@ -392,10 +388,8 @@ Move MovePicker::pick_move_from_list() {
} }
if(bestIndex != -1) { if(bestIndex != -1) {
MoveStack tmp = moves[movesPicked]; move = moves[bestIndex].move;
moves[movesPicked] = moves[bestIndex]; moves[bestIndex] = moves[movesPicked++];
moves[bestIndex] = tmp;
move = moves[movesPicked++].move;
return move; return move;
} }
} }
@@ -431,11 +425,8 @@ Move MovePicker::pick_move_from_list() {
bestIndex = movesPicked; bestIndex = movesPicked;
if(bestIndex != -1) { if(bestIndex != -1) {
MoveStack tmp = moves[movesPicked]; move = moves[bestIndex].move;
moves[movesPicked] = moves[bestIndex]; moves[bestIndex] = moves[movesPicked++];
moves[bestIndex] = tmp;
move = moves[movesPicked++].move;
// Remember to change the line below if we decide to hash the qsearch! // Remember to change the line below if we decide to hash the qsearch!
// Maybe also postpone the legality check until after futility pruning? // Maybe also postpone the legality check until after futility pruning?
if(/* move != ttMove && */ pos->move_is_legal(move, pinned)) if(/* move != ttMove && */ pos->move_is_legal(move, pinned))