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new quad-bitboard representation

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This commit is contained in:
Paul-Nicolas Madelaine 2025-11-29 14:12:20 +01:00
parent 57b78880f2
commit 4c137d3c95
3 changed files with 43 additions and 39 deletions
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38
src/position.rs
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@ -90,7 +90,7 @@ impl Position {
Bitboard(0x2CFF00000000FF2C),
Bitboard(0x7600000000000076),
Bitboard(0x9900000000000099),
Bitboard(0x000000000000FFFF),
Bitboard(0xFFFF000000000000),
],
turn: Color::White,
castling_rights: CastlingRights::full(),
@ -230,7 +230,7 @@ impl Position {
/// play and discards the en passant square.
pub fn pass(&self) -> Option<Self> {
let Setup {
bitboards: [p_b_q, n_b_k, r_q_k, w],
bitboards: [p_b_q, n_b_k, r_q_k, black],
turn,
en_passant: _,
castling_rights: _,
@ -243,8 +243,8 @@ impl Position {
let r = r_q_k ^ q ^ k;
let p = p_b_q ^ b ^ q;
let (us, them) = match turn {
Color::White => (w, blockers ^ w),
Color::Black => (blockers ^ w, w),
Color::White => (blockers ^ black, black),
Color::Black => (black, blockers ^ black),
};
let king_square = (us & k).next().unwrap();
let checkers = them
@ -580,7 +580,7 @@ impl Position {
let global_mask_to = moves.to();
let Setup {
bitboards: [p_b_q, n_b_k, r_q_k, w],
bitboards: [p_b_q, n_b_k, r_q_k, black],
turn,
en_passant,
castling_rights,
@ -588,8 +588,8 @@ impl Position {
let blockers = p_b_q | n_b_k | r_q_k;
let (us, them) = match turn {
Color::White => (w, blockers ^ w),
Color::Black => (blockers ^ w, w),
Color::White => (blockers ^ black, black),
Color::Black => (black, blockers ^ black),
};
let k = n_b_k & r_q_k;
@ -938,9 +938,9 @@ impl Position {
MoveType::EnPassant => {
let direction = !setup.turn.forward();
let x = (unsafe { to.trans_unchecked(direction) }).bitboard();
let [p_b_q, _, _, w] = &mut setup.bitboards;
let [p_b_q, _, _, black] = &mut setup.bitboards;
*p_b_q ^= x;
*w &= !x;
*black &= !x;
aux_play_pawn_advance(setup, Role::Pawn, from, to);
}
}
@ -952,7 +952,7 @@ impl Position {
#[inline]
fn aux_play_normal(
Setup {
bitboards: [p_b_q, n_b_k, r_q_k, w],
bitboards: [p_b_q, n_b_k, r_q_k, black],
turn,
en_passant: _,
castling_rights,
@ -967,7 +967,7 @@ fn aux_play_normal(
*p_b_q &= mask;
*n_b_k &= mask;
*r_q_k &= mask;
*w &= mask;
*black &= mask;
if target == Square::from_coords(File::H, turn.promotion_rank()) {
castling_rights.unset(!*turn, CastlingSide::Short);
}
@ -1005,15 +1005,15 @@ fn aux_play_normal(
*p_b_q |= to;
}
}
if let Color::White = *turn {
*w |= to;
if let Color::Black = *turn {
*black |= to;
}
}
#[inline]
fn aux_play_pawn_advance(
Setup {
bitboards: [p_b_q, n_b_k, r_q_k, w],
bitboards: [p_b_q, n_b_k, r_q_k, black],
turn,
en_passant: _,
castling_rights: _,
@ -1044,15 +1044,15 @@ fn aux_play_pawn_advance(
}
Role::Pawn => *p_b_q ^= from | to,
}
if let Color::White = *turn {
*w ^= from | to;
if let Color::Black = *turn {
*black ^= from | to;
}
}
#[inline]
fn aux_play_castle(
Setup {
bitboards: [_, n_b_k, r_q_k, w],
bitboards: [_, n_b_k, r_q_k, black],
turn,
en_passant: _,
castling_rights,
@ -1075,8 +1075,8 @@ fn aux_play_castle(
),
};
if let Color::White = *turn {
*w ^= king_flip | rook_flip;
if let Color::Black = *turn {
*black ^= king_flip | rook_flip;
}
*n_b_k ^= king_flip;
*r_q_k ^= king_flip | rook_flip;