1 use criterion::{black_box, criterion_group, criterion_main, Criterion};
2 use itertools::Itertools;
3
4 // Keep aggregate generated elements the same, regardless of powerset length.
5 const TOTAL_ELEMENTS: usize = 1 << 12;
calc_iters(n: usize) -> usize6 const fn calc_iters(n: usize) -> usize {
7 TOTAL_ELEMENTS / (1 << n)
8 }
9
powerset_n(c: &mut Criterion, n: usize)10 fn powerset_n(c: &mut Criterion, n: usize) {
11 let id = format!("powerset {}", n);
12 c.bench_function(id.as_str(), move |b| {
13 b.iter(|| {
14 for _ in 0..calc_iters(n) {
15 for elt in (0..n).powerset() {
16 black_box(elt);
17 }
18 }
19 })
20 });
21 }
22
powerset_n_fold(c: &mut Criterion, n: usize)23 fn powerset_n_fold(c: &mut Criterion, n: usize) {
24 let id = format!("powerset {} fold", n);
25 c.bench_function(id.as_str(), move |b| {
26 b.iter(|| {
27 for _ in 0..calc_iters(n) {
28 (0..n).powerset().fold(0, |s, elt| s + black_box(elt).len());
29 }
30 })
31 });
32 }
33
powerset_0(c: &mut Criterion)34 fn powerset_0(c: &mut Criterion) {
35 powerset_n(c, 0);
36 }
37
powerset_1(c: &mut Criterion)38 fn powerset_1(c: &mut Criterion) {
39 powerset_n(c, 1);
40 }
41
powerset_2(c: &mut Criterion)42 fn powerset_2(c: &mut Criterion) {
43 powerset_n(c, 2);
44 }
45
powerset_4(c: &mut Criterion)46 fn powerset_4(c: &mut Criterion) {
47 powerset_n(c, 4);
48 }
49
powerset_8(c: &mut Criterion)50 fn powerset_8(c: &mut Criterion) {
51 powerset_n(c, 8);
52 }
53
powerset_12(c: &mut Criterion)54 fn powerset_12(c: &mut Criterion) {
55 powerset_n(c, 12);
56 }
57
powerset_0_fold(c: &mut Criterion)58 fn powerset_0_fold(c: &mut Criterion) {
59 powerset_n_fold(c, 0);
60 }
61
powerset_1_fold(c: &mut Criterion)62 fn powerset_1_fold(c: &mut Criterion) {
63 powerset_n_fold(c, 1);
64 }
65
powerset_2_fold(c: &mut Criterion)66 fn powerset_2_fold(c: &mut Criterion) {
67 powerset_n_fold(c, 2);
68 }
69
powerset_4_fold(c: &mut Criterion)70 fn powerset_4_fold(c: &mut Criterion) {
71 powerset_n_fold(c, 4);
72 }
73
powerset_8_fold(c: &mut Criterion)74 fn powerset_8_fold(c: &mut Criterion) {
75 powerset_n_fold(c, 8);
76 }
77
powerset_12_fold(c: &mut Criterion)78 fn powerset_12_fold(c: &mut Criterion) {
79 powerset_n_fold(c, 12);
80 }
81
82 criterion_group!(
83 benches,
84 powerset_0,
85 powerset_1,
86 powerset_2,
87 powerset_4,
88 powerset_8,
89 powerset_12,
90 powerset_0_fold,
91 powerset_1_fold,
92 powerset_2_fold,
93 powerset_4_fold,
94 powerset_8_fold,
95 powerset_12_fold,
96 );
97 criterion_main!(benches);
98