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Microptimize MoveList loop

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Add MOVE_NONE at the tail, this allows to loop
across MoveList checking for *it != MOVE_NONE,
and because *it is used imediately after compiler
is able to reuse it.

With this small patch perft speed increased of 3%

And it is also a semplification !

No functional change.
This commit is contained in:
Marco Costalba
2013-05-19 22:00:49 +02:00
parent 38cfbeeb50
commit d3608c4e79
6 changed files with 6 additions and 7 deletions
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2
src/book.cpp
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@@ -436,7 +436,7 @@ Move PolyglotBook::probe(const Position& pos, const string& fName, bool pickBest
move = make<PROMOTION>(from_sq(move), to_sq(move), PieceType(pt + 1));
// Add 'special move' flags and verify it is legal
for (MoveList<LEGAL> it(pos); !it.end(); ++it)
for (MoveList<LEGAL> it(pos); *it; ++it)
if (move == (*it ^ type_of(*it)))
return *it;