tree 7e6f122ecd392e2ab7698fe3dab91de707fb27d1
parent 1ab98933fa75d72e882b86feac1a0be3a5b02cb0
parent d0f993070929428f7a484cfce66d5690e709006d
author bors <bors@rust-lang.org> 1653578941 +0000
committer bors <bors@rust-lang.org> 1653578941 +0000

Auto merge of #97046 - conradludgate:faster-ascii-case-conv-path, r=thomcc

improve case conversion happy path

Someone shared the source code for [Go's string case conversion](https://github.com/golang/go/blob/19156a54741d4f353c9e8e0860197ca95a6ee6ca/src/strings/strings.go#L558-L616).

It features a hot path for ascii-only strings (although I assume for reasons specific to go, they've opted for a read safe hot loop).

I've borrowed these ideas and also kept our existing code to provide a fast path + seamless utf-8 correct path fallback.

(Naive) Benchmarks can be found here https://github.com/conradludgate/case-conv

For the cases where non-ascii is found near the start, the performance of this algorithm does fall back to original speeds and has not had any measurable speed loss