blob: 1f9075dad36e0bfa7162ce89bcde0d582e5de345 [file] [log] [blame]
#![feature(test)]
extern crate test;
extern crate itertools;
use test::{black_box, Bencher};
use itertools::Itertools;
// aproximate 100_000 iterations for each combination
const N1: usize = 100_000;
const N2: usize = 448;
const N3: usize = 86;
const N4: usize = 41;
#[bench]
fn comb_for1(b: &mut Bencher) {
b.iter(|| {
for i in 0..N1 {
black_box(i);
}
});
}
#[bench]
fn comb_for2(b: &mut Bencher) {
b.iter(|| {
for i in 0..N2 {
for j in (i + 1)..N2 {
black_box(i + j);
}
}
});
}
#[bench]
fn comb_for3(b: &mut Bencher) {
b.iter(|| {
for i in 0..N3 {
for j in (i + 1)..N3 {
for k in (j + 1)..N3 {
black_box(i + j + k);
}
}
}
});
}
#[bench]
fn comb_for4(b: &mut Bencher) {
b.iter(|| {
for i in 0..N4 {
for j in (i + 1)..N4 {
for k in (j + 1)..N4 {
for l in (k + 1)..N4 {
black_box(i + j + k + l);
}
}
}
}
});
}
#[bench]
fn comb_c1(b: &mut Bencher) {
b.iter(|| {
for (i,) in (0..N1).tuple_combinations() {
black_box(i);
}
});
}
#[bench]
fn comb_c2(b: &mut Bencher) {
b.iter(|| {
for (i, j) in (0..N2).tuple_combinations() {
black_box(i + j);
}
});
}
#[bench]
fn comb_c3(b: &mut Bencher) {
b.iter(|| {
for (i, j, k) in (0..N3).tuple_combinations() {
black_box(i + j + k);
}
});
}
#[bench]
fn comb_c4(b: &mut Bencher) {
b.iter(|| {
for (i, j, k, l) in (0..N4).tuple_combinations() {
black_box(i + j + k + l);
}
});
}