pcg_rand 0.10.0

#![feature(test)]

extern crate pcg_rand;
extern crate rand;
extern crate rand_core;
extern crate test;

use pcg_rand::Pcg32Basic;
use rand::{prng::Hc128Rng, FromEntropy, XorShiftRng};
use rand_core::RngCore;
use test::Bencher;

#[bench]
fn pcg32basic_next_u32(b: &mut Bencher) {
    let mut rng = Pcg32Basic::from_entropy();

    b.iter(|| rng.next_u32())
}

#[bench]
fn pcg32basic_fill_bytes(b: &mut Bencher) {
    b.bytes = 1024 * 1024;
    let mut rng = Pcg32Basic::from_entropy();

    let mut x = vec![0; b.bytes as usize];

    b.iter(|| rng.fill_bytes(x.as_mut_slice()))
}

#[bench]
fn xorshift_next_u32(b: &mut Bencher) {
    let mut rng = XorShiftRng::from_entropy();

    b.iter(|| rng.next_u32())
}

#[bench]
fn xorshift_fill_bytes(b: &mut Bencher) {
    b.bytes = 1024 * 1024;
    let mut rng = XorShiftRng::from_entropy();

    let mut x = vec![0; b.bytes as usize];

    b.iter(|| rng.fill_bytes(x.as_mut_slice()))
}

#[bench]
fn hc128_next_u32(b: &mut Bencher) {
    let mut rng = Hc128Rng::from_entropy();

    b.iter(|| rng.next_u32())
}

#[bench]
fn hc128_fill_bytes(b: &mut Bencher) {
    b.bytes = 1024 * 1024;
    let mut rng = Hc128Rng::from_entropy();

    let mut x = vec![0; b.bytes as usize];

    b.iter(|| rng.fill_bytes(x.as_mut_slice()))
}