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Optimize attacks

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STC:  https://tests.stockfishchess.org/tests/view/6a57f12c5529b8472df80e2a
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 85856 W: 22400 L: 22037 D: 41419
Ptnml(0-2): 153, 8999, 24290, 9304, 182

closes https://github.com/official-stockfish/Stockfish/pull/6983

No functional change
This commit is contained in:
mstembera
2026-07-20 10:59:45 +02:00
committed by Joost VandeVondele
parent b4ea9205a6
commit d70dec7d6f
4 changed files with 56 additions and 41 deletions
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src/attacks.h
+30 -4
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@@ -22,6 +22,7 @@
#include <cassert>
#include <array>
#include <initializer_list>
#include <utility>
#include "types.h"
#include "bitboard.h"
@@ -135,7 +136,9 @@ struct alignas(32) DualMagic {
}
};
const DualMagic& dual_magic(Square s);
extern DualMagic DualMagics[SQUARE_NB];
inline const DualMagic& dual_magic(Square s) { return DualMagics[s]; }
#else
// Magic holds all magic bitboards relevant data for a single square
@@ -164,9 +167,24 @@ const Magic& magic(Square s, PieceType pt);
#endif
Bitboard line_bb(Square s1, Square s2);
Bitboard between_bb(Square s1, Square s2);
Bitboard ray_pass_bb(Square s1, Square s2);
extern Bitboard LineBB[SQUARE_NB][SQUARE_NB];
extern Bitboard BetweenBB[SQUARE_NB][SQUARE_NB];
extern Bitboard RayPassBB[SQUARE_NB][SQUARE_NB];
inline Bitboard line_bb(Square s1, Square s2) {
assert(is_ok(s1) && is_ok(s2));
return LineBB[s1][s2];
}
inline Bitboard between_bb(Square s1, Square s2) {
assert(is_ok(s1) && is_ok(s2));
return BetweenBB[s1][s2];
}
inline Bitboard ray_pass_bb(Square s1, Square s2) {
assert(is_ok(s1) && is_ok(s2));
return RayPassBB[s1][s2];
}
// Returns the bitboard of target square for the given step
// from the given square. If the step is off the board, returns empty bitboard.
@@ -304,6 +322,14 @@ inline Bitboard attacks_bb(Square s, Bitboard occupied) {
#endif
}
inline std::pair<Bitboard, Bitboard> both_attacks_bb(Square s, Bitboard occupied) {
#ifdef USE_DUAL_HYPERBOLA_QUINT
return dual_magic(s).both_attacks_bb(occupied);
#else
return {attacks_bb<BISHOP>(s, occupied), attacks_bb<ROOK>(s, occupied)};
#endif
}
// Returns the attacks by the given piece
// assuming the board is occupied according to the passed Bitboard.
// Sliding piece attacks do not continue past an occupied square.