Spent an hour drafting a GitHub issue, then suddenly my tab disappeared and tossed out all my work :( No history, not showing up in closed tabs. Just gone. Big argh.
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(I've just been informed that the compiler spends almost no time validating utf-8, but this is still useful. Ooph. But also lol)
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This is an incredibly well written issue! If it goes somewhere I’m happy to help with the porting.
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I think the fastest way to validate this would be to put the AVX2 algorithm inside the body of run_utf8_validation: https://github.com/rust-lang/rust/blob/2f688ac602d50129388bb2a5519942049096cbff/src/libcore/str/mod.rs#L1500-L1618 … And then file a PR with it. From the PR there's already automated tooling in place to check performance changes!
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