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Improve index generation

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The speedup seems to vary by machine.  The indexing function can be changed w/o needing to understand intrinsics.

Result of 100 runs
==================
base (...ish_baseline) =    1719637  +/- 3233
test (./stockfish    ) =    1734245  +/- 3534
diff                   =     +14608  +/- 4868

speedup        = +0.0085
P(speedup > 0) =  1.0000

closes https://github.com/official-stockfish/Stockfish/pull/6366

No functional change
This commit is contained in:
Timothy Herchen
2025-11-01 10:42:42 +01:00
committed by Joost VandeVondele
parent 3bb01ce7a9
commit 6764561916
3 changed files with 48 additions and 33 deletions
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src/position.h
+7 -4
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@@ -91,10 +91,11 @@ class Position {
Bitboard pieces(PieceTypes... pts) const;
Bitboard pieces(Color c) const;
template<typename... PieceTypes>
Bitboard pieces(Color c, PieceTypes... pts) const;
Piece piece_on(Square s) const;
Square ep_square() const;
bool empty(Square s) const;
Bitboard pieces(Color c, PieceTypes... pts) const;
Piece piece_on(Square s) const;
const Piece* piece_array() const;
Square ep_square() const;
bool empty(Square s) const;
template<PieceType Pt>
int count(Color c) const;
template<PieceType Pt>
@@ -208,6 +209,8 @@ inline Piece Position::piece_on(Square s) const {
return board[s];
}
inline const Piece* Position::piece_array() const { return board; }
inline bool Position::empty(Square s) const { return piece_on(s) == NO_PIECE; }
inline Piece Position::moved_piece(Move m) const { return piece_on(m.from_sq()); }