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Delay checking for duplicated killer moves

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Follow the usual approach to delay computation
as far as possible, in case an earlier killer
cut-offs we avoid to do useless work.

This also greatly simplifies the code.

No functional change.
This commit is contained in:
Marco Costalba 2015-02-01 13:08:14 +01:00
parent 0dc6f16992
commit 20d6a8e57f
1 changed files with 18 additions and 26 deletions
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44
src/movepick.cpp
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@ -201,28 +201,13 @@ void MovePicker::generate_next_stage() {
case KILLERS_S1:
cur = killers;
endMoves = cur + 2;
endMoves = cur + 6;
killers[0].move = ss->killers[0];
killers[1].move = ss->killers[1];
killers[2].move = killers[3].move = MOVE_NONE;
killers[4].move = killers[5].move = MOVE_NONE;
// In SMP case countermoves[] and followupmoves[] could have duplicated entries
// in rare cases (less than 1 out of a million). This is harmless.
// Be sure countermoves and followupmoves are different from killers
for (int i = 0; i < 2; ++i)
if ( countermoves[i] != killers[0].move
&& countermoves[i] != killers[1].move)
(endMoves++)->move = countermoves[i];
for (int i = 0; i < 2; ++i)
if ( followupmoves[i] != killers[0].move
&& followupmoves[i] != killers[1].move
&& followupmoves[i] != killers[2].move
&& followupmoves[i] != killers[3].move)
(endMoves++)->move = followupmoves[i];
killers[2].move = countermoves[0];
killers[3].move = countermoves[1];
killers[4].move = followupmoves[0];
killers[5].move = followupmoves[1];
break;
case QUIETS_1_S1:
@ -307,18 +292,25 @@ Move MovePicker::next_move<false>() {
&& move != ttMove
&& pos.pseudo_legal(move)
&& !pos.capture(move))
{
// Check for duplicated entries
for (int i = 0; i < cur - 1 - killers; i++)
if (move == killers[i])
goto skip;
return move;
}
skip:
break;
case QUIETS_1_S1: case QUIETS_2_S1:
move = *cur++;
if ( move != ttMove
&& move != killers[0].move
&& move != killers[1].move
&& move != killers[2].move
&& move != killers[3].move
&& move != killers[4].move
&& move != killers[5].move)
&& move != killers[0]
&& move != killers[1]
&& move != killers[2]
&& move != killers[3]
&& move != killers[4]
&& move != killers[5])
return move;
break;