kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-04-30 08:43:09 +00:00
Code Issues Releases Wiki Activity

Don't prefetch if not needed

Browse source 
Prefetch access to hash tables only in case we
have changed pawn or material hash keys.

No functional change.
This commit is contained in:
Marco Costalba 2013-01-27 10:15:59 +01:00
parent bd87ab9ff5
commit 52cab06fff
1 changed files with 5 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
src/position.cpp
View file

@ -802,9 +802,10 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
pieceList[them][capture][index[lastSquare]] = lastSquare; pieceList[them][capture][index[lastSquare]] = lastSquare;
pieceList[them][capture][pieceCount[them][capture]] = SQ_NONE; pieceList[them][capture][pieceCount[them][capture]] = SQ_NONE;
// Update hash keys // Update material hash key and prefetch access to materialTable
k ^= Zobrist::psq[them][capture][capsq]; k ^= Zobrist::psq[them][capture][capsq];
st->materialKey ^= Zobrist::psq[them][capture][pieceCount[them][capture]]; st->materialKey ^= Zobrist::psq[them][capture][pieceCount[them][capture]];
prefetch((char*)thisThread->materialTable[st->materialKey]);
// Update incremental scores // Update incremental scores
st->psqScore -= pieceSquareTable[make_piece(them, capture)][capsq]; st->psqScore -= pieceSquareTable[make_piece(them, capture)][capsq];
@ -831,7 +832,7 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
st->castleRights &= ~cr; st->castleRights &= ~cr;
} }
// Prefetch TT access as soon as we know key is updated // Prefetch TT access as soon as we know the new hash key
prefetch((char*)TT.first_entry(k)); prefetch((char*)TT.first_entry(k));
// Move the piece // Move the piece
@ -894,17 +895,14 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
st->npMaterial[us] += PieceValue[MG][promotion]; st->npMaterial[us] += PieceValue[MG][promotion];
} }
// Update pawn hash key // Update pawn hash key and prefetch access to pawnsTable
st->pawnKey ^= Zobrist::psq[us][PAWN][from] ^ Zobrist::psq[us][PAWN][to]; st->pawnKey ^= Zobrist::psq[us][PAWN][from] ^ Zobrist::psq[us][PAWN][to];
prefetch((char*)thisThread->pawnsTable[st->pawnKey]);
// Reset rule 50 draw counter // Reset rule 50 draw counter
st->rule50 = 0; st->rule50 = 0;
} }
// Prefetch pawn and material hash tables
prefetch((char*)thisThread->pawnsTable[st->pawnKey]);
prefetch((char*)thisThread->materialTable[st->materialKey]);
// Update incremental scores // Update incremental scores
st->psqScore += psq_delta(piece, from, to); st->psqScore += psq_delta(piece, from, to);