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Code Issues Releases Wiki Activity

Delay killers[] initialization

Browse source 
Most of the time we cut-off earlier, at captures, so this
results in useless work.

There is a small functionality change becuase 'ss' can change
from MovePicker c'tor to when killers are tried due, for
instance, to singular search.

bench: 4603795
This commit is contained in:
Marco Costalba 2013-05-18 12:49:31 +02:00
parent 77547a4ef1
commit 38cfbeeb50
2 changed files with 13 additions and 13 deletions
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25
src/movepick.cpp
View file

@ -78,6 +78,7 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats&
captureThreshold = 0; captureThreshold = 0;
cur = end = moves; cur = end = moves;
endBadCaptures = moves + MAX_MOVES - 1; endBadCaptures = moves + MAX_MOVES - 1;
countermoves = cm;
ss = s; ss = s;
if (p.checkers()) if (p.checkers())
@ -87,17 +88,12 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats&
{ {
phase = MAIN_SEARCH; phase = MAIN_SEARCH;
killers[0].move = ss->killers[0];
killers[1].move = ss->killers[1];
killers[2].move = cm[0];
killers[3].move = cm[1];
// Consider sligtly negative captures as good if at low depth and far from beta // Consider sligtly negative captures as good if at low depth and far from beta
if (ss && ss->staticEval < beta - PawnValueMg && d < 3 * ONE_PLY) if (ss->staticEval < beta - PawnValueMg && d < 3 * ONE_PLY)
captureThreshold = -PawnValueMg; captureThreshold = -PawnValueMg;
// Consider negative captures as good if still enough to reach beta // Consider negative captures as good if still enough to reach beta
else if (ss && ss->staticEval > beta) else if (ss->staticEval > beta)
captureThreshold = beta - ss->staticEval; captureThreshold = beta - ss->staticEval;
} }
@ -241,15 +237,18 @@ void MovePicker::generate_next() {
cur = killers; cur = killers;
end = cur + 2; end = cur + 2;
if ((cur+3)->move && (cur+3)->move == (cur+2)->move) // Due to a SMP race killers[0].move = ss->killers[0];
(cur+3)->move = MOVE_NONE; killers[1].move = ss->killers[1];
killers[2].move = killers[3].move = MOVE_NONE;
// Be sure countermoves are different from killers // Be sure countermoves are different from killers
if ((cur+2)->move != cur->move && (cur+2)->move != (cur+1)->move) for (int i = 0; i < 2; i++)
end++; if (countermoves[i] != cur->move && countermoves[i] != (cur+1)->move)
(end++)->move = countermoves[i];
if (countermoves[1] && countermoves[1] == countermoves[0]) // Due to SMP races
killers[3].move = MOVE_NONE;
if ((cur+3)->move != cur->move && (cur+3)->move != (cur+1)->move)
(end++)->move = (cur+3)->move;
return; return;
case QUIETS_1_S1: case QUIETS_1_S1:

1
src/movepick.h
View file

@ -97,6 +97,7 @@ private:
const Position& pos; const Position& pos;
const HistoryStats& history; const HistoryStats& history;
Search::Stack* ss; Search::Stack* ss;
Move* countermoves;
Depth depth; Depth depth;
Move ttMove; Move ttMove;
MoveStack killers[4]; MoveStack killers[4];