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[SIMD] Move SIMD fallback bodies into Dart. #64248
Description
@alexmarkov & @mraleph I see that you're working on the typed_data recognized methods in modular_aot. What do you think about moving the SIMD fallbacks declared on C++-side into Dart. That way we wouldn't have to maintain two fallback implementations. We won't be able to move everything, but I think most of it.
I've been adding them to C++ for consistency, but I personally think declaring those that we can declare on Dart-side would be much cleaner since we already have fallbacks in Dart for, e.g., JS and DDC.
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alexmarkov commentedon Sep 9, 2026
I think this is a good idea. If Dart implementation is possible, we should prefer Dart rather than native fallback.
biggs0125 commentedon Sep 9, 2026
@modulovalue Is this something you're planning on/interested in adding?
modulovalue commentedon Sep 9, 2026
@biggs0125 Yes!
We should make sure the implementations are correct before we move things over. Floats are blocked by #63962 (min/max) and #39551 (reciprocalSqrt), clamp & scale. I'm on it.
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