openethereum/util/benches/bigint.rs

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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! benchmarking for bigint
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//! should be started with:
//! ```bash
//! multirust run nightly cargo bench
//! ```
#![feature(test)]
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#![feature(asm)]
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extern crate test;
extern crate ethcore_util;
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use test::{Bencher, black_box};
use ethcore_util::{U256, U512, U128};
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#[bench]
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fn u256_add(b: &mut Bencher) {
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b.iter(|| {
let n = black_box(10000);
let zero = black_box(U256::zero());
(0..n).fold(zero, |old, new| { old.overflowing_add(U256::from(black_box(new))).0 })
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});
}
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#[bench]
fn u256_sub(b: &mut Bencher) {
b.iter(|| {
let n = black_box(10000);
let max = black_box(U256::max_value());
(0..n).fold(max, |old, new| { old.overflowing_sub(U256::from(black_box(new))).0 })
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});
}
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#[bench]
fn u512_sub(b: &mut Bencher) {
b.iter(|| {
let n = black_box(10000);
let max = black_box(U512::max_value());
(0..n).fold(
max,
|old, new| {
let new = black_box(new);
let p = new % 2;
old.overflowing_sub(U512([p, p, p, p, p, p, p, new])).0
}
)
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});
}
#[bench]
fn u512_add(b: &mut Bencher) {
b.iter(|| {
let n = black_box(10000);
let zero = black_box(U512::zero());
(0..n).fold(zero,
|old, new| {
let new = black_box(new);
old.overflowing_add(U512([new, new, new, new, new, new, new, new])).0
})
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});
}
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#[bench]
fn u256_mul(b: &mut Bencher) {
b.iter(|| {
let n = black_box(10000);
let one = black_box(U256::one());
(0..n).fold(one, |old, new| { old.overflowing_mul(U256::from(black_box(new))).0 })
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});
}
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#[bench]
fn u256_full_mul(b: &mut Bencher) {
b.iter(|| {
let n = black_box(10000);
let one = black_box(U256::one());
(0..n).fold(one,
|old, new| {
let new = black_box(new);
let U512(ref u512words) = old.full_mul(U256([new, new, new, new]));
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U256([u512words[0], u512words[2], u512words[2], u512words[3]])
})
});
}
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#[bench]
fn u128_mul(b: &mut Bencher) {
b.iter(|| {
let n = black_box(10000);
(0..n).fold(U128([12345u64, 0u64]), |old, new| { old.overflowing_mul(U128::from(new)).0 })
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});
}