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Use a specialized function for king evaluation

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King evaluation is special in any case and as an added
benefit we can use the HasPopCnt optimization also for king.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-06-05 12:58:03 +02:00
parent 48c95706c8
commit e41602b721
1 changed files with 15 additions and 16 deletions
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31
src/evaluate.cpp
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@ -274,8 +274,8 @@ namespace {
template<PieceType Piece, bool HasPopCnt>
void evaluate_pieces(const Position& p, Color us, EvalInfo& ei);
template<>
void evaluate_pieces<KING, false>(const Position& p, Color us, EvalInfo &ei);
template<bool HasPopCnt>
void evaluate_king(const Position& p, Color us, EvalInfo &ei);
void evaluate_passed_pawns(const Position &pos, EvalInfo &ei);
void evaluate_trapped_bishop_a7h7(const Position &pos, Square s, Color us,
@ -368,11 +368,11 @@ Value do_evaluate(const Position& pos, EvalInfo& ei, int threadID) {
| ei.attackedBy[c][QUEEN] | ei.attackedBy[c][KING];
}
// Kings. Kings are evaluated after all other pieces for both sides,
// Kings. Kings are evaluated after all other pieces for both sides,
// because we need complete attack information for all pieces when computing
// the king safety evaluation.
for (Color c = WHITE; c <= BLACK; c++)
evaluate_pieces<KING, false>(pos, c, ei);
evaluate_king<HasPopCnt>(pos, c, ei);
// Evaluate passed pawns. We evaluate passed pawns for both sides at once,
// because we need to know which side promotes first in positions where
@ -704,11 +704,10 @@ namespace {
return b >> (num << 3);
}
// evaluate_pieces<KING>() assigns bonuses and penalties to a king of a given
// color.
// evaluate_king<>() assigns bonuses and penalties to a king of a given color.
template<>
void evaluate_pieces<KING, false>(const Position& p, Color us, EvalInfo& ei) {
template<bool HasPopCnt>
void evaluate_king(const Position& p, Color us, EvalInfo& ei) {
int shelter = 0, sign = Sign[us];
Square s = p.king_square(us);
@ -761,7 +760,7 @@ namespace {
// quality of the pawn shelter.
int attackUnits =
Min((ei.kingAttackersCount[them] * ei.kingAttackersWeight[them]) / 2, 25)
+ (ei.kingAdjacentZoneAttacksCount[them] + count_1s_max_15(undefended)) * 3
+ (ei.kingAdjacentZoneAttacksCount[them] + count_1s_max_15<HasPopCnt>(undefended)) * 3
+ InitKingDanger[relative_square(us, s)] - (shelter >> 5);
// Analyse safe queen contact checks
@ -777,7 +776,7 @@ namespace {
{
// The bitboard b now contains the squares available for safe queen
// contact checks.
int count = count_1s_max_15(b);
int count = count_1s_max_15<HasPopCnt>(b);
attackUnits += QueenContactCheckBonus * count * (sente ? 2 : 1);
// Is there a mate threat?
@ -817,12 +816,12 @@ namespace {
// Queen checks
b2 = b & ei.attacked_by(them, QUEEN);
if( b2)
attackUnits += QueenCheckBonus * count_1s_max_15(b2);
attackUnits += QueenCheckBonus * count_1s_max_15<HasPopCnt>(b2);
// Rook checks
b2 = b & ei.attacked_by(them, ROOK);
if (b2)
attackUnits += RookCheckBonus * count_1s_max_15(b2);
attackUnits += RookCheckBonus * count_1s_max_15<HasPopCnt>(b2);
}
if (QueenCheckBonus > 0 || BishopCheckBonus > 0)
{
@ -831,12 +830,12 @@ namespace {
// Queen checks
b2 = b & ei.attacked_by(them, QUEEN);
if (b2)
attackUnits += QueenCheckBonus * count_1s_max_15(b2);
attackUnits += QueenCheckBonus * count_1s_max_15<HasPopCnt>(b2);
// Bishop checks
b2 = b & ei.attacked_by(them, BISHOP);
if (b2)
attackUnits += BishopCheckBonus * count_1s_max_15(b2);
attackUnits += BishopCheckBonus * count_1s_max_15<HasPopCnt>(b2);
}
if (KnightCheckBonus > 0)
{
@ -845,7 +844,7 @@ namespace {
// Knight checks
b2 = b & ei.attacked_by(them, KNIGHT);
if (b2)
attackUnits += KnightCheckBonus * count_1s_max_15(b2);
attackUnits += KnightCheckBonus * count_1s_max_15<HasPopCnt>(b2);
}
// Analyse discovered checks (only for non-pawns right now, consider
@ -854,7 +853,7 @@ namespace {
{
b = p.discovered_check_candidates(them) & ~p.pawns();
if (b)
attackUnits += DiscoveredCheckBonus * count_1s_max_15(b) * (sente? 2 : 1);
attackUnits += DiscoveredCheckBonus * count_1s_max_15<HasPopCnt>(b) * (sente? 2 : 1);
}
// Has a mate threat been found? We don't do anything here if the