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Consolidate all attacks bitboards

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This is a non-functional simplification that simplifies getting attacks bitboards.

* consolidates all attacks to attacks_bb (remove Position::attacks_from(..)).
* attacks_bb<PieceType>(square) gets pseudo attacks
* attacks_bb<PieceType>(square, bitboard) gets attacks considering occupied squares in the bitboard).
* pawn_attacks_bb(Color, Square) gets pawn attacks like other pawn attack bitboards.
* Wraps all access to PawnAttacks arrays and PseudoAttacks arrays and adds asserts as appropriate.

Passed STC
LLR: 2.95 (-2.94,2.94) {-1.50,0.50}
Total: 90208 W: 17533 L: 17482 D: 55193
Ptnml(0-2): 1412, 10232, 21798, 10217, 1445
https://tests.stockfishchess.org/tests/view/5ece996275787cc0c05d9790

closes https://github.com/official-stockfish/Stockfish/pull/2703

No functional change
This commit is contained in:
protonspring
2020-05-28 09:48:31 -06:00
committed by Joost VandeVondele
parent fb8095718b
commit a5e3b4edde
8 changed files with 76 additions and 72 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
src/bitboard.h
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@@ -176,6 +176,12 @@ constexpr Bitboard pawn_attacks_bb(Bitboard b) {
: shift<SOUTH_WEST>(b) | shift<SOUTH_EAST>(b);
}
inline Bitboard pawn_attacks_bb(Color c, Square s) {
assert(is_ok(s));
return PawnAttacks[c][s];
}
/// pawn_double_attacks_bb() returns the squares doubly attacked by pawns of the
/// given color from the squares in the given bitboard.
@@ -266,19 +272,38 @@ inline Bitboard safe_destination(Square s, int step)
return is_ok(to) && distance(s, to) <= 2 ? square_bb(to) : Bitboard(0);
}
/// attacks_bb() returns a bitboard representing all the squares attacked by a
/// piece of type Pt (bishop or rook) placed on 's'.
/// attacks_bb(Square) returns the pseudo attacks of the give piece type
/// assuming an empty board.
template<PieceType Pt>
inline Bitboard attacks_bb(Square s) {
assert((Pt != PAWN) && (is_ok(s)));
return PseudoAttacks[Pt][s];
}
/// attacks_bb(Square, Bitboard) returns the attacks by the given piece
/// assuming the board is occupied according to the passed Bitboard.
/// Sliding piece attacks do not continue passed an occupied square.
template<PieceType Pt>
inline Bitboard attacks_bb(Square s, Bitboard occupied) {
const Magic& m = Pt == ROOK ? RookMagics[s] : BishopMagics[s];
return m.attacks[m.index(occupied)];
assert((Pt != PAWN) && (is_ok(s)));
switch (Pt)
{
case BISHOP: return BishopMagics[s].attacks[BishopMagics[s].index(occupied)];
case ROOK : return RookMagics[s].attacks[ RookMagics[s].index(occupied)];
case QUEEN : return attacks_bb<BISHOP>(s, occupied) | attacks_bb<ROOK>(s, occupied);
default : return PseudoAttacks[Pt][s];
}
}
inline Bitboard attacks_bb(PieceType pt, Square s, Bitboard occupied) {
assert(pt != PAWN);
assert((pt != PAWN) && (is_ok(s)));
switch (pt)
{