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Prefetch also material tables

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Prefetch both pawn and material tables in do_move() and
prefetch always, not only after a pawn move or a capture.

Speed up of 0,7%

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-04-11 09:03:34 +02:00
parent 2f1935078d
commit 6738b65be9
3 changed files with 9 additions and 10 deletions
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13
src/evaluate.cpp
View file

@ -269,16 +269,13 @@ namespace {
}
////
//// Functions
////
/// prefetchTables() is called in do_move() to prefetch pawn and material
/// hash tables data that will be needed shortly after in evaluation.
void prefetchTables(Key pKey, Key mKey, int threadID) {
/// Prefetches in pawn hash tables
void prefetchPawn(Key key, int threadID) {
PawnTable[threadID]->prefetch(key);
PawnTable[threadID]->prefetch(pKey);
MaterialTable[threadID]->prefetch(mKey);
}

2
src/misc.h
View file

@ -29,7 +29,7 @@ extern int get_system_time();
extern int cpu_count();
extern int input_available();
extern void prefetch(char* addr);
extern void prefetchPawn(Key, int);
extern void prefetchTables(Key pKey, Key mKey, int threadID);
// Debug functions
extern bool dbg_show_mean;

4
src/position.cpp
View file

@ -885,7 +885,6 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
// 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)
@ -938,6 +937,9 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
}
}
// Prefetch pawn and material hash tables
prefetchTables(st->pawnKey, st->materialKey, threadID);
// Update incremental scores
st->value += pst_delta(piece, from, to);