[wasm] SIMD support tracking issue

[radekdoulik]

Context: https://github.com/WebAssembly/simd/blob/master/proposals/simd/SIMD.md

Currently still not implemented in Safari. Many engines have implementation available as experimental feature, disabled by default. For example in Firefox it can be enabled in about:config by setting javascript.options.wasm_simd to true.

Emscripten support exists https://emscripten.org/docs/porting/simd.html. Can be enabled with -msimd128. SSE emulation also exists.

Possible future performance gains in Json #41097

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Issue Details

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Context: https://github.com/WebAssembly/simd/blob/master/proposals/simd/SIMD.md

Currently still not implemented in Safari. Many engines have implementation available as experimental feature, disabled by default. For example in Firefox it can be enabled in about:config by setting javascript.options.wasm_simd to true.

Emscripten support exists https://emscripten.org/docs/porting/simd.html. Can be enabled with -msimd128. SSE emulation also exists.

Possible future performance gains in Json #41097

Author:	radekdoulik
Assignees:	-
Labels:	arch-wasm
Milestone:	Future

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[tannergooding]

I feel this should be area-System.Runtime.Intrinsics.

While there are certainly internal optimizations possible for the Mono LLVM backend, the WASM SIMD support is very similar in principle to the x64 and ARM64 hardware intrinsics and so likely deserves the dedicated API surface (presumably under System.Runtime.Intrinsics.Wasm) and integration with System.Numerics.Vector<T> and friends.