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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/thread.cpp
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@@ -371,7 +371,7 @@ void ThreadPool::start_thinking(const Position& pos, const LimitsType& limits,
SetupStates = states; // Ownership transfer here
RootMoves.clear();
for (MoveList<LEGAL> it(pos); !it.end(); ++it)
for (MoveList<LEGAL> it(pos); *it; ++it)
if ( searchMoves.empty()
|| std::count(searchMoves.begin(), searchMoves.end(), *it))
RootMoves.push_back(RootMove(*it));