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Optimize an expression in endgame.cpp

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I believe using foward_file_bb() here is fewer instructions.

a) Fewer instructions and probably more clear (debatable).
b) Possible that a lookup is slower than a few local operations, but the
   forward_file_bb table is probably used often enough that it is always
   cached.

Passed
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 21004 W: 4263 L: 4141 D: 12600
http://tests.stockfishchess.org/tests/view/5b1cad830ebc5902ab9c6239

Closes https://github.com/official-stockfish/Stockfish/pull/1644

No functional change.
This commit is contained in:
protonspring 2018-06-11 10:17:03 +02:00 • committed by Stéphane Nicolet
parent 88de112b84
commit fc3af7c4fb
1 changed files with 1 additions and 1 deletions
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src/endgame.cpp
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@ -214,7 +214,7 @@ Value Endgame<KRKP>::operator()(const Position& pos) const {
Value result;
// If the stronger side's king is in front of the pawn, it's a win
if (wksq < psq && file_of(wksq) == file_of(psq))
if (forward_file_bb(WHITE, wksq) & psq)
result = RookValueEg - distance(wksq, psq);
// If the weaker side's king is too far from the pawn and the rook,