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88de112)
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.
Value result;
// If the stronger side's king is in front of the pawn, it's a win
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,
result = RookValueEg - distance(wksq, psq);
// If the weaker side's king is too far from the pawn and the rook,