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(imported from improperly closed bug rust-lang/rust#20658 )
So, the good news is that this cargo package is beating the deprecated stdlib code on my machine.
The bad news is that it is still slower than what the original issue author expects to see.
(Though I also don't think the original issue author's code is conformant with what the docs here say the fn width method should do on char.)
Anyway, here is a port of the benchmark provided by the original author, adapted to also test this cargo package. It is followed with the benchmark results on my machine.
#![feature(test, unicode)]
extern crate test;
extern crate unicode_width;
use test::{Bencher};
use unicode_width::UnicodeWidthChar;
const STRING: &'static str =
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
#[bench]
fn stdlib(b: &mut Bencher) {
b.iter(|| {
for c in STRING.chars() {
test::black_box(c.width(false));
}
});
}
#[bench]
fn cargo(b: &mut Bencher) {
b.iter(|| {
for c in STRING.chars() {
test::black_box(UnicodeWidthChar::width(c));
}
});
}
#[bench]
fn simple(b: &mut Bencher) {
b.iter(|| {
for c in STRING.chars() {
if (c as u32) < 127 {
if (c as u32) > 31 {
test::black_box(Some(1));
} else {
test::black_box(None::<usize>);
}
} else {
test::black_box(c.width(false));
}
}
});
}03-03-58 char_fast_path/char_fast_path (git:fsk-sized-bounded-iter) % rustc --version
rustc 1.0.0-nightly (1284be404 2015-04-18) (built 2015-04-17)
03-04-12 char_fast_path/char_fast_path (git:fsk-sized-bounded-iter) % cargo bench
Running target/release/char_fast_path-935b3c19b07d9282
running 3 tests
test cargo ... bench: 3197 ns/iter (+/- 401)
test simple ... bench: 1465 ns/iter (+/- 500)
test stdlib ... bench: 3427 ns/iter (+/- 571)
test result: ok. 0 passed; 0 failed; 0 ignored; 3 measured
03-04-21 char_fast_path/char_fast_path (git:fsk-sized-bounded-iter) %
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