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Retire updateKingTables[]

Browse source 
Suggested by Marek Kwiatkowski.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-10-06 09:11:27 +02:00
parent 1bbbc13b46
commit f00c976bb2
1 changed files with 10 additions and 13 deletions
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23
src/evaluate.cpp
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@ -45,11 +45,6 @@ namespace {
// Pointer to pawn hash table entry
PawnInfo* pi;
// updateKingTables[color] is set to true if we have enough material
// to trigger the opponent's king safety calculation. When is false we
// skip the time consuming update of the king attackers tables.
bool updateKingTables[2];
// attackedBy[color][piece type] is a bitboard representing all squares
// attacked by a given color and piece type, attackedBy[color][0] contains
// all squares attacked by the given color.
@ -443,14 +438,17 @@ namespace {
Bitboard b = ei.attackedBy[Them][KING] = pos.attacks_from<KING>(pos.king_square(Them));
ei.attackedBy[Us][PAWN] = ei.pi->pawn_attacks(Us);
ei.updateKingTables[Us] = pos.piece_count(Us, QUEEN) && pos.non_pawn_material(Us) >= QueenValueMidgame + RookValueMidgame;
if (ei.updateKingTables[Us])
// Init king safety tables only if we are going to use them
if ( pos.piece_count(Us, QUEEN)
&& pos.non_pawn_material(Us) >= QueenValueMidgame + RookValueMidgame)
{
ei.kingZone[Us] = (b | (Us == WHITE ? b >> 8 : b << 8));
b &= ei.attackedBy[Us][PAWN];
ei.kingAttackersCount[Us] = b ? count_1s<Max15>(b) / 2 : EmptyBoardBB;
ei.kingAdjacentZoneAttacksCount[Us] = ei.kingAttackersWeight[Us] = EmptyBoardBB;
}
ei.kingAttackersCount[Us] = b ? count_1s<Max15>(b) / 2 : 0;
ei.kingAdjacentZoneAttacksCount[Us] = ei.kingAttackersWeight[Us] = 0;
} else
ei.kingZone[Us] = ei.kingAttackersCount[Us] = 0;
}
@ -514,7 +512,7 @@ namespace {
ei.attackedBy[Us][Piece] |= b;
// King attacks
if (ei.updateKingTables[Us] && (b & ei.kingZone[Us]))
if (b & ei.kingZone[Us])
{
ei.kingAttackersCount[Us]++;
ei.kingAttackersWeight[Us] += KingAttackWeights[Piece];
@ -666,8 +664,7 @@ namespace {
// King safety. This is quite complicated, and is almost certainly far
// from optimally tuned.
if ( ei.updateKingTables[Them]
&& ei.kingAttackersCount[Them] >= 2
if ( ei.kingAttackersCount[Them] >= 2
&& ei.kingAdjacentZoneAttacksCount[Them])
{
// Find the attacked squares around the king which has no defenders