use criterion::{black_box, criterion_group, criterion_main, BenchmarkId, Criterion};
use rayon::iter::IntoParallelIterator;
use rayon::iter::ParallelIterator;

#[spindle::basic_range]
fn _identity(x: i32) -> i32 {
    x
}

fn rayon_vec(x: i32) -> Vec<i32> {
    (0..x).into_par_iter().collect()
}

fn bench_square_over_two(c: &mut Criterion) {
    let mut group = c.benchmark_group("filling_boxed_array");
    for n in [
        10_000i32,
        100_000,
        1_000_000,
        10_000_000,
        100_000_000,
        1_000_000_000,
    ] {
        group.bench_with_input(BenchmarkId::new("spindle identity", n), &n, |b, &n| {
            b.iter(|| black_box(unsafe { n._identity() }.unwrap()))
        });

        group.bench_with_input(BenchmarkId::new("rayon identity", n), &n, |b, &n| {
            b.iter(|| black_box(rayon_vec(n)))
        });
    }
}

criterion_group!(benches, bench_square_over_two);
criterion_main!(benches);