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use criterion::{black_box, criterion_group, criterion_main, Criterion};
use itertools::Itertools;
// Keep aggregate generated elements the same, regardless of powerset length.
const TOTAL_ELEMENTS: usize = 1 << 12;
const fn calc_iters(n: usize) -> usize {
TOTAL_ELEMENTS / (1 << n)
}
fn powerset_n(c: &mut Criterion, n: usize) {
let id = format!("powerset {}", n);
c.bench_function(id.as_str(), move |b| {
b.iter(|| {
for _ in 0..calc_iters(n) {
for elt in (0..n).powerset() {
black_box(elt);
}
}
})
});
}
fn powerset_0(c: &mut Criterion) { powerset_n(c, 0); }
fn powerset_1(c: &mut Criterion) { powerset_n(c, 1); }
fn powerset_2(c: &mut Criterion) { powerset_n(c, 2); }
fn powerset_4(c: &mut Criterion) { powerset_n(c, 4); }
fn powerset_8(c: &mut Criterion) { powerset_n(c, 8); }
fn powerset_12(c: &mut Criterion) { powerset_n(c, 12); }
criterion_group!(
benches,
powerset_0,
powerset_1,
powerset_2,
powerset_4,
powerset_8,
powerset_12,
);
criterion_main!(benches);