tinystr 0.8.3

A small ASCII-only bounded length string representation.
Documentation 
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// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).

mod common;
use common::*;

use criterion::black_box;
use criterion::criterion_group;
use criterion::criterion_main;
use criterion::Criterion;

use tinystr::TinyAsciiStr;

fn overview(c: &mut Criterion) {
    let mut g = c.benchmark_group("overview");

    g.bench_function("construct/utf8/TinyAsciiStr", |b| {
        b.iter(|| {
            for s in STRINGS_4 {
                let _: TinyAsciiStr<4> =
                    TinyAsciiStr::try_from_utf8(black_box(s.as_bytes())).unwrap();
                let _: TinyAsciiStr<8> =
                    TinyAsciiStr::try_from_utf8(black_box(s.as_bytes())).unwrap();
                let _: TinyAsciiStr<16> =
                    TinyAsciiStr::try_from_utf8(black_box(s.as_bytes())).unwrap();
            }
            for s in STRINGS_8 {
                let _: TinyAsciiStr<8> =
                    TinyAsciiStr::try_from_utf8(black_box(s.as_bytes())).unwrap();
                let _: TinyAsciiStr<16> =
                    TinyAsciiStr::try_from_utf8(black_box(s.as_bytes())).unwrap();
            }
            for s in STRINGS_16 {
                let _: TinyAsciiStr<16> =
                    TinyAsciiStr::try_from_utf8(black_box(s.as_bytes())).unwrap();
            }
        });
    });

    let strings_4_utf16: Vec<Vec<u16>> = STRINGS_4
        .iter()
        .map(|s| s.encode_utf16().collect())
        .collect();

    let strings_8_utf16: Vec<Vec<u16>> = STRINGS_8
        .iter()
        .map(|s| s.encode_utf16().collect())
        .collect();

    let strings_16_utf16: Vec<Vec<u16>> = STRINGS_16
        .iter()
        .map(|s| s.encode_utf16().collect())
        .collect();

    g.bench_function("construct/utf16/TinyAsciiStr", |b| {
        b.iter(|| {
            for s in strings_4_utf16.iter() {
                let _: TinyAsciiStr<4> = TinyAsciiStr::try_from_utf16(black_box(s)).unwrap();
                let _: TinyAsciiStr<8> = TinyAsciiStr::try_from_utf16(black_box(s)).unwrap();
                let _: TinyAsciiStr<16> = TinyAsciiStr::try_from_utf16(black_box(s)).unwrap();
            }
            for s in strings_8_utf16.iter() {
                let _: TinyAsciiStr<8> = TinyAsciiStr::try_from_utf16(black_box(s)).unwrap();
                let _: TinyAsciiStr<16> = TinyAsciiStr::try_from_utf16(black_box(s)).unwrap();
            }
            for s in strings_16_utf16.iter() {
                let _: TinyAsciiStr<16> = TinyAsciiStr::try_from_utf16(black_box(s)).unwrap();
            }
        });
    });

    let parsed_ascii_4: Vec<TinyAsciiStr<4>> = STRINGS_4
        .iter()
        .map(|s| s.parse::<TinyAsciiStr<4>>().unwrap())
        .collect();
    let parsed_ascii_8: Vec<TinyAsciiStr<8>> = STRINGS_4
        .iter()
        .chain(STRINGS_8)
        .map(|s| s.parse::<TinyAsciiStr<8>>().unwrap())
        .collect();
    let parsed_ascii_16: Vec<TinyAsciiStr<16>> = STRINGS_4
        .iter()
        .chain(STRINGS_8)
        .chain(STRINGS_16)
        .map(|s| s.parse::<TinyAsciiStr<16>>().unwrap())
        .collect();

    g.bench_function("read/TinyAsciiStr", |b| {
        b.iter(|| {
            let mut collector: usize = 0;
            for t in black_box(&parsed_ascii_4) {
                let s: &str = t;
                collector += s.bytes().map(usize::from).sum::<usize>();
            }
            for t in black_box(&parsed_ascii_8) {
                let s: &str = t;
                collector += s.bytes().map(usize::from).sum::<usize>();
            }
            for t in black_box(&parsed_ascii_16) {
                let s: &str = t;
                collector += s.bytes().map(usize::from).sum::<usize>();
            }
            collector
        });
    });

    g.bench_function("compare/TinyAsciiStr", |b| {
        b.iter(|| {
            let mut collector: usize = 0;
            for ts in black_box(&parsed_ascii_4).windows(2) {
                let o = ts[0].cmp(&ts[1]);
                collector ^= o as usize;
            }
            for ts in black_box(&parsed_ascii_8).windows(2) {
                let o = ts[0].cmp(&ts[1]);
                collector ^= o as usize;
            }
            for ts in black_box(&parsed_ascii_16).windows(2) {
                let o = ts[0].cmp(&ts[1]);
                collector ^= o as usize;
            }
            collector
        });
    });
}

criterion_group!(benches, overview,);
criterion_main!(benches);