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Better annotate unlikely conditions

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And in case of gcc we win also a small
speed optimization due to better branch
prediction.

No functional change.
This commit is contained in:
Marco Costalba
2013-07-15 20:50:24 +02:00
parent a6c5f60caa
commit cbb1a8ed31
3 changed files with 10 additions and 2 deletions
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2
src/evaluate.cpp
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@@ -823,7 +823,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
// If there is an enemy rook or queen attacking the pawn from behind,
// add all X-ray attacks by the rook or queen. Otherwise consider only
// the squares in the pawn's path attacked or occupied by the enemy.
if ( (forward_bb(Them, s) & pos.pieces(Them, ROOK, QUEEN)) // Unlikely
if ( unlikely(forward_bb(Them, s) & pos.pieces(Them, ROOK, QUEEN))
&& (forward_bb(Them, s) & pos.pieces(Them, ROOK, QUEEN) & pos.attacks_from<ROOK>(s)))
unsafeSquares = squaresToQueen;
else