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Compact position structures

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Reorder the structures data members in position.h to reduce padding.

Passed STC:
https://tests.stockfishchess.org/tests/view/60a8011fce8ea25a3ef04069
LLR: 2.94 (-2.94,2.94) <-0.50,2.50>
Total: 14120 W: 1214 L: 1067 D: 11839
Ptnml(0-2): 26, 857, 5161, 976, 40

---

Also tested for speed locally by Joost:

Result of  50 runs
==================
base (./stockfish.master       ) =    2254919  +/- 4439
test (./stockfish.patch        ) =    2274003  +/- 5278
diff                             =     +19084  +/- 6386
==================
speedup        = +0.0085
P(speedup > 0) =  1.0000

---

closes https://github.com/official-stockfish/Stockfish/pull/3488

No functional change.
This commit is contained in:
Guy Vreuls 2021-05-21 20:22:29 +02:00 • committed by Stéphane Nicolet
parent 754fc8a8b5
commit f233ca1af4
1 changed files with 3 additions and 3 deletions
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6
src/position.h
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@ -51,11 +51,11 @@ struct StateInfo {
// Not copied when making a move (will be recomputed anyhow) // Not copied when making a move (will be recomputed anyhow)
Key key; Key key;
Bitboard checkersBB; Bitboard checkersBB;
Piece capturedPiece;
StateInfo* previous; StateInfo* previous;
Bitboard blockersForKing[COLOR_NB]; Bitboard blockersForKing[COLOR_NB];
Bitboard pinners[COLOR_NB]; Bitboard pinners[COLOR_NB];
Bitboard checkSquares[PIECE_TYPE_NB]; Bitboard checkSquares[PIECE_TYPE_NB];
Piece capturedPiece;
int repetition; int repetition;
// Used by NNUE // Used by NNUE
@ -192,11 +192,11 @@ private:
int castlingRightsMask[SQUARE_NB]; int castlingRightsMask[SQUARE_NB];
Square castlingRookSquare[CASTLING_RIGHT_NB]; Square castlingRookSquare[CASTLING_RIGHT_NB];
Bitboard castlingPath[CASTLING_RIGHT_NB]; Bitboard castlingPath[CASTLING_RIGHT_NB];
Thread* thisThread;
StateInfo* st;
int gamePly; int gamePly;
Color sideToMove; Color sideToMove;
Score psq; Score psq;
Thread* thisThread;
StateInfo* st;
bool chess960; bool chess960;
}; };