> > > WebAssembly SIMD will of course fix this so that using SIMD can have > performance benefits. Emscripten actually does support WebAssembly SIMD > when using the LLVM backend, but it is very bleeding edge and there are > still a few bugs. And because the WebAssembly SIMD proposal is still in an > early stage, the instructions it contains are subject to change. > > As for the error you are seeing, it is telling you that Fastcomp does not > support 2 x i64 vectors. Unfortunately Fastcomp does not know how to lower > unsupported vector types into supported vector types, although the LLVM > backend does. Until SIMD stabilizes in the LLVM backend and ships on JS > engines, the best way around this error is going to be to remove all uses > of 2 x i64 vectors (and 2 x f64 vectors) from your code. >
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