43 lines
1.2 KiB
Rust
43 lines
1.2 KiB
Rust
use criterion::{criterion_group, criterion_main, Criterion};
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use std::fmt::Display;
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use std::hint;
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use std::io::Write;
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use std::{f32, f64};
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fn do_bench(c: &mut Criterion, group_name: &str, float: impl ryu::Float + Display) {
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let mut group = c.benchmark_group(group_name);
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group.bench_function("ryu", |b| {
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let mut buf = ryu::Buffer::new();
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b.iter(move || {
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let float = hint::black_box(float);
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let formatted = buf.format_finite(float);
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hint::black_box(formatted);
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});
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});
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group.bench_function("std::fmt", |b| {
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let mut buf = Vec::with_capacity(20);
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b.iter(|| {
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buf.clear();
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let float = hint::black_box(float);
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write!(&mut buf, "{float}").unwrap();
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hint::black_box(buf.as_slice());
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});
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});
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group.finish();
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}
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fn bench(c: &mut Criterion) {
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do_bench(c, "f64[0]", 0f64);
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do_bench(c, "f64[short]", 0.1234f64);
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do_bench(c, "f64[e]", f64::consts::E);
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do_bench(c, "f64[max]", f64::MAX);
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do_bench(c, "f32[0]", 0f32);
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do_bench(c, "f32[short]", 0.1234f32);
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do_bench(c, "f32[e]", f32::consts::E);
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do_bench(c, "f32[max]", f32::MAX);
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}
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criterion_group!(benches, bench);
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criterion_main!(benches);
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