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BurntSushi / memchr

Optimized string search routines for Rust.
The Unlicense
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require 'simd128' on 'wasm32' #149

Closed BurntSushi closed 3 months ago

BurntSushi commented 3 months ago

It turns out that providing routines with #[target_feature(enable = "simd128")] on wasm32 can fail in some older browsers. The specific problem is not totally clear to me, but it is straight-forward enough to fix (I hope) by just requiring that simd128 be enabled at compile time in order to include the wasm32 SIMD modules in this crate.

This would not be a great solution if WASM supported runtime CPU feature detection. And the status quo is that simd128 has to be enabled at compile time anyway for the SIMD code to take effect. So this shouldn't cause any regressions and is likely something we can do long term as well. We can re-evaluate once and if WASM gets support for runtime CPU feature detection.

We also add a CI test for wasm32 without the simd128 target feature enabled.

Fixes #144

BurntSushi commented 3 months ago

This PR is in memchr 2.7.2 on crates.io.