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6f0a6bd1bb
For intrepid commit message readers: The choice to add allows for the inlined format args lint instead of actually inlining them is not very clear because our actual real world MSRV is not clear. We currently claim 1.60 is our MSRV but this is mainly due to dependencies. I'm fairly sure that we could support < 1.58 if those deps are outdated in a users lockfile. We'll remove these allows again at some point soon.
98 lines
2.9 KiB
Rust
98 lines
2.9 KiB
Rust
#![allow(clippy::uninlined_format_args)]
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use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion};
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const CODES: &[u16] = &[0, 1000, 201, 800, 550];
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fn bench_quality_display_impls(c: &mut Criterion) {
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let mut group = c.benchmark_group("quality value display impls");
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for i in CODES.iter() {
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group.bench_with_input(BenchmarkId::new("New (fast?)", i), i, |b, &i| {
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b.iter(|| _new::Quality(i).to_string())
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});
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group.bench_with_input(BenchmarkId::new("Naive", i), i, |b, &i| {
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b.iter(|| _naive::Quality(i).to_string())
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});
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}
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group.finish();
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}
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criterion_group!(benches, bench_quality_display_impls);
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criterion_main!(benches);
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mod _new {
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use std::fmt;
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pub struct Quality(pub(crate) u16);
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impl fmt::Display for Quality {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self.0 {
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0 => f.write_str("0"),
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1000 => f.write_str("1"),
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// some number in the range 1–999
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x => {
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f.write_str("0.")?;
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// this implementation avoids string allocation otherwise required
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// for `.trim_end_matches('0')`
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if x < 10 {
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f.write_str("00")?;
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// 0 is handled so it's not possible to have a trailing 0, we can just return
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itoa_fmt(f, x)
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} else if x < 100 {
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f.write_str("0")?;
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if x % 10 == 0 {
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// trailing 0, divide by 10 and write
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itoa_fmt(f, x / 10)
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} else {
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itoa_fmt(f, x)
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}
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} else {
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// x is in range 101–999
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if x % 100 == 0 {
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// two trailing 0s, divide by 100 and write
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itoa_fmt(f, x / 100)
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} else if x % 10 == 0 {
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// one trailing 0, divide by 10 and write
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itoa_fmt(f, x / 10)
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} else {
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itoa_fmt(f, x)
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}
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}
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}
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}
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}
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}
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pub fn itoa_fmt<W: fmt::Write, V: itoa::Integer>(mut wr: W, value: V) -> fmt::Result {
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let mut buf = itoa::Buffer::new();
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wr.write_str(buf.format(value))
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}
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}
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mod _naive {
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use std::fmt;
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pub struct Quality(pub(crate) u16);
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impl fmt::Display for Quality {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self.0 {
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0 => f.write_str("0"),
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1000 => f.write_str("1"),
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x => {
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write!(f, "{}", format!("{:03}", x).trim_end_matches('0'))
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}
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}
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}
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}
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}
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