Suggestion: Check simdjson-rs numberparse.rs for performance ideas

[eun-ice]

This code is parsing numbers using simd instructions and with little to no branching: https://github.com/simd-lite/simdjson-rs/blob/master/src/numberparse.rs

Maybe some ideas there are of interest to this?

Related talk: https://www.youtube.com/watch?v=wlvKAT7SZIQ

[Dmitry Rodionov]

There is a library https://github.com/RoDmitry/atoi_simd to parse it faster using simd.

[Markus Klein]

Thanks for the hint. It is part of the charm of this library that it works with any integer type (i.e. anything with a neutral element and successors) not only the primitive ones. @RoDmitry it seems your piece of kit sits on a slightly different part in the ecosystem. I could offer to mention it in the Readme, or would you rather I use it as a piece of foundational tech in this crate?

I feel this crate is at a bit of a crossroads, but without specializations supported by the Rust compiler, I would at least need a breaking interface change to adopt it. Might be fine though.

See also: #21

[Sergey "Shnatsel" Davidoff]

atoi_simd has some limitations compared to the standard library parser: no support for leading zeroes or numbers starting with +. A more complete SIMD-accelerated parser can be found here: https://crates.io/crates/atoi_radix10

[Dmitry Rodionov]

There are no more such limitations using atoi_simd::parse_skipped. Also atoi_simd has support of ARM Neon SIMD.