rdrand 0.1.7

#![feature(test)]
extern crate rand;
extern crate test;

use test::Bencher;
use test::black_box;
use rand::Rng;
use rand::StdRng;
use rand::OsRng;

// OsRng is supposed to be the default for crypto uses.
#[bench]
fn bench_osrng_u64(b : &mut Bencher) {
    if let Ok(mut gen) = OsRng::new() {
        b.bytes = 8;
        b.iter(|| {
            black_box(gen.next_u64());
        });
    }
}

// StdRng is the default for everything else.
#[bench]
fn bench_stdrng_u64(b : &mut Bencher) {
    if let Ok(mut gen) = StdRng::new() {
        b.bytes = 8;
        b.iter(|| {
            gen.next_u64();
        });
    }
}