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#[macro_use]
extern crate bencher;
extern crate crc32fast;
extern crate rand;
use bencher::Bencher;
use crc32fast::Hasher;
use rand::Rng;
fn bench(b: &mut Bencher, size: usize, hasher_init: Hasher) {
let mut bytes = vec![0u8; size];
rand::thread_rng().fill(&mut bytes[..]);
b.iter(|| {
let mut hasher = hasher_init.clone();
hasher.update(&bytes);
bencher::black_box(hasher.finalize())
});
b.bytes = size as u64;
}
fn bench_kilobyte_baseline(b: &mut Bencher) {
bench(b, 1024, Hasher::internal_new_baseline(0, 0))
}
fn bench_kilobyte_specialized(b: &mut Bencher) {
bench(b, 1024, Hasher::internal_new_specialized(0, 0).unwrap())
}
fn bench_megabyte_baseline(b: &mut Bencher) {
bench(b, 1024 * 1024, Hasher::internal_new_baseline(0, 0))
}
fn bench_megabyte_specialized(b: &mut Bencher) {
bench(
b,
1024 * 1024,
Hasher::internal_new_specialized(0, 0).unwrap(),
)
}
benchmark_group!(
bench_baseline,
bench_kilobyte_baseline,
bench_megabyte_baseline
);
benchmark_group!(
bench_specialized,
bench_kilobyte_specialized,
bench_megabyte_specialized
);
benchmark_main!(bench_baseline, bench_specialized);