ZeroTierOne/zeroidc/vendor/num-bigint/benches/factorial.rs

43 lines
991 B
Rust

#![feature(test)]
extern crate test;
use num_bigint::BigUint;
use num_traits::One;
use std::ops::{Div, Mul};
use test::Bencher;
#[bench]
fn factorial_mul_biguint(b: &mut Bencher) {
b.iter(|| {
(1u32..1000)
.map(BigUint::from)
.fold(BigUint::one(), Mul::mul)
});
}
#[bench]
fn factorial_mul_u32(b: &mut Bencher) {
b.iter(|| (1u32..1000).fold(BigUint::one(), Mul::mul));
}
// The division test is inspired by this blog comparison:
// <https://tiehuis.github.io/big-integers-in-zig#division-test-single-limb>
#[bench]
fn factorial_div_biguint(b: &mut Bencher) {
let n: BigUint = (1u32..1000).fold(BigUint::one(), Mul::mul);
b.iter(|| {
(1u32..1000)
.rev()
.map(BigUint::from)
.fold(n.clone(), Div::div)
});
}
#[bench]
fn factorial_div_u32(b: &mut Bencher) {
let n: BigUint = (1u32..1000).fold(BigUint::one(), Mul::mul);
b.iter(|| (1u32..1000).rev().fold(n.clone(), Div::div));
}