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Code Issues Releases Wiki Activity

Avoid to use nullChild

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Use instead:

(ss-1)->currentMove == MOVE_NULL

No functional change.
This commit is contained in:
Marco Costalba 2014-06-06 11:12:05 +02:00
parent d10ae90dea
commit 7f56d2949d
2 changed files with 8 additions and 6 deletions
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13
src/search.cpp
View file

@ -469,7 +469,7 @@ namespace {
bestValue = -VALUE_INFINITE; bestValue = -VALUE_INFINITE;
ss->currentMove = ss->ttMove = (ss+1)->excludedMove = bestMove = MOVE_NONE; ss->currentMove = ss->ttMove = (ss+1)->excludedMove = bestMove = MOVE_NONE;
ss->ply = (ss-1)->ply + 1; ss->ply = (ss-1)->ply + 1;
(ss+1)->skipNullMove = (ss+1)->nullChild = false; (ss+1)->reduction = DEPTH_ZERO; (ss+1)->skipNullMove = false; (ss+1)->reduction = DEPTH_ZERO;
(ss+2)->killers[0] = (ss+2)->killers[1] = MOVE_NONE; (ss+2)->killers[0] = (ss+2)->killers[1] = MOVE_NONE;
// Used to send selDepth info to GUI // Used to send selDepth info to GUI
@ -544,7 +544,9 @@ namespace {
} }
else else
{ {
eval = ss->staticEval = ss->nullChild ? -(ss-1)->staticEval + 2 * Eval::Tempo : evaluate(pos); eval = ss->staticEval =
(ss-1)->currentMove != MOVE_NULL ? evaluate(pos) : -(ss-1)->staticEval + 2 * Eval::Tempo;
TT.store(posKey, VALUE_NONE, BOUND_NONE, DEPTH_NONE, MOVE_NONE, ss->staticEval); TT.store(posKey, VALUE_NONE, BOUND_NONE, DEPTH_NONE, MOVE_NONE, ss->staticEval);
} }
@ -605,10 +607,10 @@ namespace {
+ int(eval - beta) / PawnValueMg * ONE_PLY; + int(eval - beta) / PawnValueMg * ONE_PLY;
pos.do_null_move(st); pos.do_null_move(st);
(ss+1)->skipNullMove = (ss+1)->nullChild = true; (ss+1)->skipNullMove = true;
nullValue = depth-R < ONE_PLY ? -qsearch<NonPV, false>(pos, ss+1, -beta, -beta+1, DEPTH_ZERO) nullValue = depth-R < ONE_PLY ? -qsearch<NonPV, false>(pos, ss+1, -beta, -beta+1, DEPTH_ZERO)
: - search<NonPV, false>(pos, ss+1, -beta, -beta+1, depth-R, !cutNode); : - search<NonPV, false>(pos, ss+1, -beta, -beta+1, depth-R, !cutNode);
(ss+1)->skipNullMove = (ss+1)->nullChild = false; (ss+1)->skipNullMove = false;
pos.undo_null_move(); pos.undo_null_move();
if (nullValue >= beta) if (nullValue >= beta)
@ -1108,7 +1110,8 @@ moves_loop: // When in check and at SpNode search starts from here
bestValue = ttValue; bestValue = ttValue;
} }
else else
ss->staticEval = bestValue = ss->nullChild ? -(ss-1)->staticEval + 2 * Eval::Tempo : evaluate(pos); ss->staticEval = bestValue =
(ss-1)->currentMove != MOVE_NULL ? evaluate(pos) : -(ss-1)->staticEval + 2 * Eval::Tempo;
// Stand pat. Return immediately if static value is at least beta // Stand pat. Return immediately if static value is at least beta
if (bestValue >= beta) if (bestValue >= beta)

1
src/search.h
View file

@ -46,7 +46,6 @@ struct Stack {
Depth reduction; Depth reduction;
Value staticEval; Value staticEval;
bool skipNullMove; bool skipNullMove;
bool nullChild;
}; };