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95 lines
2.9 KiB
Rust
95 lines
2.9 KiB
Rust
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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