42 lines
1.2 KiB
Rust
42 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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fn do_bench(c: &mut Criterion, group_name: &str, int: impl itoa::Integer + Display) {
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let mut group = c.benchmark_group(group_name);
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group.bench_function("itoa", |b| {
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let mut buf = itoa::Buffer::new();
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b.iter(move || {
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let int = hint::black_box(int);
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let formatted = buf.format(int);
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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 int = hint::black_box(int);
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write!(&mut buf, "{int}").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, "u64[0]", 0u64);
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do_bench(c, "u64[half]", u64::from(u32::MAX));
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do_bench(c, "u64[max]", u64::MAX);
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do_bench(c, "i16[0]", 0i16);
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do_bench(c, "i16[min]", i16::MIN);
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do_bench(c, "u128[0]", 0u128);
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do_bench(c, "u128[max]", u128::MAX);
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}
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criterion_group!(benches, bench);
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criterion_main!(benches);
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