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Prefetch pawn hash key

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Plus a bunch of other minor optimizations.

With this power pack we have an increase
of a whopping 1.4%  :-)

...and it took 3 good hours of profiling + hacking to get it out !

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-08-21 19:57:52 +02:00
parent b6ba5f7fe4
commit 7b721b3663
7 changed files with 75 additions and 85 deletions
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3
src/position.cpp
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@@ -845,8 +845,9 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
// Reset rule 50 draw counter
st->rule50 = 0;
// Update pawn hash key
// Update pawn hash key and prefetch in L1/L2 cache
st->pawnKey ^= zobrist[us][PAWN][from] ^ zobrist[us][PAWN][to];
prefetchPawn(st->pawnKey, threadID);
// Set en passant square, only if moved pawn can be captured
if ((to ^ from) == 16)