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//! See how `rust-decimal` performs compared to native floating numbers.
use criterion::{
black_box, criterion_group, criterion_main, measurement::Measurement, BenchmarkGroup, BenchmarkId, Criterion,
};
use rust_decimal::Decimal;
const DECIMAL_2_01: Decimal = Decimal::from_parts(201, 0, 0, false, 2);
const DECIMAL_13_7: Decimal = Decimal::from_parts(137, 0, 0, false, 1);
const F64_2_01: f64 = 2.01;
const F64_13_7: f64 = 13.7;
macro_rules! add_benchmark_group {
($criterion:expr, $f:ident, $op:tt) => {
fn $f<M, const N: usize>(group: &mut BenchmarkGroup<'_, M>)
where
M: Measurement,
{
group.bench_with_input(BenchmarkId::new("f64 (diff)", N), &N, |ben, _| {
ben.iter(|| black_box(F64_2_01 $op F64_13_7))
});
group.bench_with_input(BenchmarkId::new("f64 (equal)", N), &N, |ben, _| {
ben.iter(|| black_box(F64_2_01 $op F64_2_01))
});
group.bench_with_input(BenchmarkId::new("rust-decimal (diff)", N), &N, |ben, _| {
ben.iter(|| black_box(DECIMAL_2_01 $op DECIMAL_13_7))
});
group.bench_with_input(BenchmarkId::new("rust-decimal (equal)", N), &N, |ben, _| {
ben.iter(|| black_box(DECIMAL_2_01 $op DECIMAL_2_01))
});
}
let mut group = $criterion.benchmark_group(stringify!($f));
$f::<_, 100>(&mut group);
group.finish();
};
}
fn criterion_benchmark(c: &mut Criterion) {
add_benchmark_group!(c, addition, +);
add_benchmark_group!(c, division, /);
add_benchmark_group!(c, multiplication, *);
add_benchmark_group!(c, subtraction, -);
}
criterion_group!(benches, criterion_benchmark);
criterion_main!(benches);