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use std::simd::{Simd, SimdElement, SimdInt, SimdPartialOrd};
use crate::{
types::{
board::{Board, BoardCoord},
prim::{BOrW, Bw},
},
util::timings::{self, PerfParts},
};
use super::MoveGen;
pub struct Simd1MoveGenerator;
#[allow(dead_code)]
#[inline]
fn rotate_dyn<const LEFT: bool, T: SimdElement>(simd: Simd<T, 32>, cnt: usize) -> Simd<T, 32> {
match (LEFT, cnt) {
(true, 1) => simd.rotate_lanes_left::<1>(),
(true, 2) => simd.rotate_lanes_left::<2>(),
(true, 3) => simd.rotate_lanes_left::<3>(),
(true, 4) => simd.rotate_lanes_left::<4>(),
(true, 5) => simd.rotate_lanes_left::<5>(),
(true, 6) => simd.rotate_lanes_left::<6>(),
(false, 1) => simd.rotate_lanes_right::<1>(),
(false, 2) => simd.rotate_lanes_right::<2>(),
(false, 3) => simd.rotate_lanes_right::<3>(),
(false, 4) => simd.rotate_lanes_right::<4>(),
(false, 5) => simd.rotate_lanes_right::<5>(),
(false, 6) => simd.rotate_lanes_right::<6>(),
_ => panic!("invalid rotation, only 1-6 are supported here"),
}
}
#[inline]
fn rotate_dyn_dyn<T: SimdElement>(simd: Simd<T, 32>, cnt: usize, left: bool) -> Simd<T, 32> {
match (left, cnt) {
(true, 1) => simd.rotate_lanes_left::<1>(),
(true, 2) => simd.rotate_lanes_left::<2>(),
(true, 3) => simd.rotate_lanes_left::<3>(),
(true, 4) => simd.rotate_lanes_left::<4>(),
(true, 5) => simd.rotate_lanes_left::<5>(),
(true, 6) => simd.rotate_lanes_left::<6>(),
(false, 1) => simd.rotate_lanes_right::<1>(),
(false, 2) => simd.rotate_lanes_right::<2>(),
(false, 3) => simd.rotate_lanes_right::<3>(),
(false, 4) => simd.rotate_lanes_right::<4>(),
(false, 5) => simd.rotate_lanes_right::<5>(),
(false, 6) => simd.rotate_lanes_right::<6>(),
_ => panic!("invalid rotation, only 1-6 are supported here"),
}
}
impl MoveGen for Simd1MoveGenerator {
fn gen_moves_one_die(
board: &crate::types::board::Board,
die: crate::types::dice::Die,
player: crate::types::prim::Bw,
) -> Vec<Board> {
timings::time(PerfParts::OneDie, || {
let bar = BoardCoord::bar(player);
if !board[bar].is_empty() {
return timings::time(PerfParts::Bar, || {
let to = (bar + (player, die)).unwrap();
match board[to].to_bwn() {
Some((opp, 1)) if opp != player => {
let mut b = board.clone();
b[bar] -= 1;
b[to] = BOrW::from((player, 1));
b.inc_bar(opp);
return vec![b];
}
Some((opp, _)) if opp != player => return vec![],
Some((_, _)) => {
let mut b = board.clone();
b[bar] -= 1;
b[to] += 1;
return vec![b];
}
None => {
let mut b = board.clone();
b[bar] -= 1;
b[to] = BOrW::from((player, 1));
return vec![b];
}
};
});
};
let simdboard = board.0;
let udie = die.0 as usize;
let mut moves = timings::time(PerfParts::Removals, || {
let mut anti_home = Simd::splat(1);
match player {
Bw::White => {
for i in 1..=6 {
anti_home[i] = 0;
}
}
Bw::Black => {
for i in 19..=24 {
anti_home[i] = 0;
}
}
};
let no_home = simdboard * anti_home;
let removals_possible = match player {
Bw::White => !no_home.is_positive().any(),
Bw::Black => !no_home.is_negative().any(),
};
if !removals_possible {
vec![]
} else {
// let range = match player {
// Bw::White => 1..=udie,
// Bw::Black => (18 - udie)..=18,
// };
(1..=udie as u8)
.filter_map(|i| {
let c = BoardCoord::rel(player, i);
if board[c].matches(player) {
let mut b = board.clone();
b[c] -= 1;
Some(b)
} else {
None
}
})
.collect()
}
});
let good_targets = timings::time(PerfParts::Calc, || {
let board_targets = rotate_dyn_dyn(simdboard.clone(), udie, player == Bw::White);
let valid_from_source = match player {
Bw::White => board_targets.is_positive(),
Bw::Black => board_targets.is_negative(),
};
let targets_forbidden = match player {
Bw::White => simdboard.simd_lt(Simd::splat(-1)),
Bw::Black => simdboard.simd_gt(Simd::splat(1)),
};
let good_targets = valid_from_source & !targets_forbidden;
// println!("die: {}", udie);
// println!("\nboard: {:?}", board);
// println!(
// "vfsource: {}",
// debug_bool_board(&valid_from_source.to_array()[1..=24])
// );
// println!(
// "tforbidd: {}",
// debug_bool_board(&targets_forbidden.to_array()[1..=24])
// );
// println!(
// "goodtarg: {}",
// debug_bool_board(&good_targets.to_array()[1..=24])
// );
good_targets
});
timings::time(PerfParts::GenBoards, || {
// can't be more than 15 moves, because checkers are 15
for lane in 1..=24 {
if good_targets.test(lane) {
let mut b = board.clone();
let to = BoardCoord(lane as u8);
let Some(from) = to + (-player, die) else {
continue;
};
// println!("lane: {}", lane);
// println!("from: {:?}, to: {:?}", from, to);
// println!("from: {}, to: {}", board[from], board[to]);
match board[to].to_bwn() {
Some((opp, 1)) if opp != player => {
b[from] -= 1;
b[to] = BOrW::from((player, 1));
b.inc_bar(opp);
moves.push(b);
}
Some((opp, _)) if opp != player => {
unreachable!("this should not happen")
}
Some((_, _)) => {
b[from] -= 1;
b[to] += 1;
moves.push(b);
}
None => {
b[from] -= 1;
b[to] = BOrW::from((player, 1));
moves.push(b);
}
};
}
}
moves
})
})
}
}
#[cfg(test)]
mod test {
use once_cell::sync::Lazy;
use rand::Rng;
use crate::{
movegen::{basic::BasicMoveGenerator, MoveGen},
types::{board::Board, dice::Die, prim::Bw},
util::timings::PERF_MAP,
};
use super::Simd1MoveGenerator;
#[test]
pub fn test_same_random_moves() {
let rng = &mut rand::thread_rng();
Lazy::force(&PERF_MAP);
for iter in 0..1000 {
let board: Board = rng.gen();
let die: Die = rng.gen();
let player: Bw = rng.gen();
// println!("board: {:?}", board);
// println!("die: {:?}", die);
// println!("player: {:?}", player);
let mut basic_moves = BasicMoveGenerator::gen_moves_one_die(&board, die, player);
let mut simd_moves = Simd1MoveGenerator::gen_moves_one_die(&board, die, player);
basic_moves.sort();
simd_moves.sort();
assert_eq!(basic_moves, simd_moves, "iter: {}", iter);
}
println!("{:?}", *PERF_MAP);
}
}