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Microptimization in do_evaluate()

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Do not call count_1s_max_15() if not necessary, as is
not in the common case (>95%).

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-07-23 18:30:56 +01:00
parent 8b45b60327
commit 8654fee18c
1 changed files with 7 additions and 2 deletions
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9
src/evaluate.cpp
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@@ -353,8 +353,13 @@ Value do_evaluate(const Position& pos, EvalInfo& ei, int threadID) {
// Initialize pawn attack bitboards for both sides // Initialize pawn attack bitboards for both sides
ei.attackedBy[WHITE][PAWN] = ((pos.pawns(WHITE) << 9) & ~FileABB) | ((pos.pawns(WHITE) << 7) & ~FileHBB); ei.attackedBy[WHITE][PAWN] = ((pos.pawns(WHITE) << 9) & ~FileABB) | ((pos.pawns(WHITE) << 7) & ~FileHBB);
ei.attackedBy[BLACK][PAWN] = ((pos.pawns(BLACK) >> 7) & ~FileABB) | ((pos.pawns(BLACK) >> 9) & ~FileHBB); ei.attackedBy[BLACK][PAWN] = ((pos.pawns(BLACK) >> 7) & ~FileABB) | ((pos.pawns(BLACK) >> 9) & ~FileHBB);
ei.kingAttackersCount[WHITE] = count_1s_max_15<HasPopCnt>(ei.attackedBy[WHITE][PAWN] & ei.attackedBy[BLACK][KING])/2; Bitboard b1 = ei.attackedBy[WHITE][PAWN] & ei.attackedBy[BLACK][KING];
ei.kingAttackersCount[BLACK] = count_1s_max_15<HasPopCnt>(ei.attackedBy[BLACK][PAWN] & ei.attackedBy[WHITE][KING])/2; Bitboard b2 = ei.attackedBy[BLACK][PAWN] & ei.attackedBy[WHITE][KING];
if (b1)
ei.kingAttackersCount[WHITE] = count_1s_max_15<HasPopCnt>(b1)/2;
if (b2)
ei.kingAttackersCount[BLACK] = count_1s_max_15<HasPopCnt>(b2)/2;
// Evaluate pieces // Evaluate pieces
for (Color c = WHITE; c <= BLACK; c++) for (Color c = WHITE; c <= BLACK; c++)