mirror of
https://github.com/actix/actix-web.git
synced 2024-11-22 17:41:11 +00:00
95 lines
2.9 KiB
Rust
95 lines
2.9 KiB
Rust
use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion};
|
||
|
||
const CODES: &[u16] = &[0, 1000, 201, 800, 550];
|
||
|
||
fn bench_quality_display_impls(c: &mut Criterion) {
|
||
let mut group = c.benchmark_group("quality value display impls");
|
||
|
||
for i in CODES.iter() {
|
||
group.bench_with_input(BenchmarkId::new("New (fast?)", i), i, |b, &i| {
|
||
b.iter(|| _new::Quality(i).to_string())
|
||
});
|
||
|
||
group.bench_with_input(BenchmarkId::new("Naive", i), i, |b, &i| {
|
||
b.iter(|| _naive::Quality(i).to_string())
|
||
});
|
||
}
|
||
|
||
group.finish();
|
||
}
|
||
|
||
criterion_group!(benches, bench_quality_display_impls);
|
||
criterion_main!(benches);
|
||
|
||
mod _new {
|
||
use std::fmt;
|
||
|
||
pub struct Quality(pub(crate) u16);
|
||
|
||
impl fmt::Display for Quality {
|
||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||
match self.0 {
|
||
0 => f.write_str("0"),
|
||
1000 => f.write_str("1"),
|
||
|
||
// some number in the range 1–999
|
||
x => {
|
||
f.write_str("0.")?;
|
||
|
||
// this implementation avoids string allocation otherwise required
|
||
// for `.trim_end_matches('0')`
|
||
|
||
if x < 10 {
|
||
f.write_str("00")?;
|
||
// 0 is handled so it's not possible to have a trailing 0, we can just return
|
||
itoa_fmt(f, x)
|
||
} else if x < 100 {
|
||
f.write_str("0")?;
|
||
if x % 10 == 0 {
|
||
// trailing 0, divide by 10 and write
|
||
itoa_fmt(f, x / 10)
|
||
} else {
|
||
itoa_fmt(f, x)
|
||
}
|
||
} else {
|
||
// x is in range 101–999
|
||
|
||
if x % 100 == 0 {
|
||
// two trailing 0s, divide by 100 and write
|
||
itoa_fmt(f, x / 100)
|
||
} else if x % 10 == 0 {
|
||
// one trailing 0, divide by 10 and write
|
||
itoa_fmt(f, x / 10)
|
||
} else {
|
||
itoa_fmt(f, x)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
pub fn itoa_fmt<W: fmt::Write, V: itoa::Integer>(mut wr: W, value: V) -> fmt::Result {
|
||
let mut buf = itoa::Buffer::new();
|
||
wr.write_str(buf.format(value))
|
||
}
|
||
}
|
||
|
||
mod _naive {
|
||
use std::fmt;
|
||
|
||
pub struct Quality(pub(crate) u16);
|
||
|
||
impl fmt::Display for Quality {
|
||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||
match self.0 {
|
||
0 => f.write_str("0"),
|
||
1000 => f.write_str("1"),
|
||
|
||
x => {
|
||
write!(f, "{}", format!("{:03}", x).trim_end_matches('0'))
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|