// Copyright 2020 Parity Technologies
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//! Benchmarks for fixed-hash cmp implementation.

use criterion::{black_box, criterion_group, criterion_main, BenchmarkId, Criterion};

use fixed_hash::construct_fixed_hash;

construct_fixed_hash! { pub struct H256(32); }

criterion_group!(cmp, eq_equal, eq_nonequal, compare,);
criterion_main!(cmp);

fn eq_equal(c: &mut Criterion) {
	let mut group = c.benchmark_group("eq_self");
	for input in [
		H256::zero(),
		H256::repeat_byte(0xAA),
		H256::from([
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xEF, 0x2D, 0x6D, 0x19, 0x40, 0x84,
			0xC2, 0xDE, 0x36, 0xE0, 0xDA, 0xBF, 0xCE, 0x45, 0xD0, 0x46, 0xB3, 0x7D, 0x11, 0x06,
		]),
		H256([u8::max_value(); 32]),
	] {
		group.bench_with_input(BenchmarkId::from_parameter(input), &input, |b, x| {
			b.iter(|| black_box(x.eq(black_box(x))))
		});
	}
	group.finish();
}

fn eq_nonequal(c: &mut Criterion) {
	let mut group = c.benchmark_group("eq_nonequal");
	for input in [
		(
			H256::zero(),
			H256::from([
				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
			]),
		),
		(H256::repeat_byte(0xAA), H256::repeat_byte(0xA1)),
		(
			H256::from([
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xEF, 0x2D, 0x6D, 0x19, 0x40,
				0x84, 0xC2, 0xDE, 0x36, 0xE0, 0xDA, 0xBF, 0xCE, 0x45, 0xD0, 0x46, 0xB3, 0x7D, 0x11, 0x06,
			]),
			H256::from([
				0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xEF, 0x2D, 0x6D, 0x19, 0x40,
				0x84, 0xC2, 0xDE, 0x36, 0xE0, 0xDA, 0xBF, 0xCE, 0x45, 0xD0, 0x46, 0xB3, 0x7D, 0x11, 0x06,
			]),
		),
	] {
		group.bench_with_input(BenchmarkId::from_parameter(input.0), &input, |b, (x, y)| {
			b.iter(|| black_box(x.eq(black_box(y))))
		});
	}
	group.finish();
}

fn compare(c: &mut Criterion) {
	let mut group = c.benchmark_group("compare");
	for input in [
		(
			H256::zero(),
			H256::from([
				0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
			]),
		),
		(H256::zero(), H256::zero()),
		(H256::repeat_byte(0xAA), H256::repeat_byte(0xAA)),
		(H256::repeat_byte(0xAA), H256::repeat_byte(0xA1)),
		(
			H256::from([
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xEF, 0x2D, 0x6D, 0x19, 0x40,
				0x84, 0xC2, 0xDF, 0x36, 0xE0, 0xDA, 0xBF, 0xCE, 0x45, 0xD0, 0x46, 0xB3, 0x7D, 0x11, 0x06,
			]),
			H256::from([
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xEF, 0x2D, 0x6D, 0x19, 0x40,
				0x84, 0xC2, 0xDE, 0x36, 0xE0, 0xDA, 0xBF, 0xCE, 0x45, 0xD0, 0x46, 0xB3, 0x7D, 0x11, 0x06,
			]),
		),
	] {
		group.bench_with_input(BenchmarkId::from_parameter(input.1), &input, |b, (x, y)| {
			b.iter(|| black_box(x.cmp(black_box(y))))
		});
	}
	group.finish();
}