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Revert "Remove confusing optimization"

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This reverts commit e05c80a088.

we gain a speed up of 1.5% under gcc !

No functional change.
This commit is contained in:
Marco Costalba 2013-07-02 20:06:24 +02:00
parent 2d82db1d14
commit 12c0dfc113
1 changed files with 2 additions and 1 deletions
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3
src/evaluate.cpp
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@ -821,7 +821,8 @@ 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) & pos.attacks_from<ROOK>(s))
if ( (forward_bb(Them, s) & pos.pieces(Them, ROOK, QUEEN)) // Unlikely
&& (forward_bb(Them, s) & pos.pieces(Them, ROOK, QUEEN) & pos.attacks_from<ROOK>(s)))
unsafeSquares = squaresToQueen;
else
unsafeSquares = squaresToQueen & (ei.attackedBy[Them][ALL_PIECES] | pos.pieces(Them));