As others have already pointed out, this has been tried before. Turns out that some people are opposed to shipping LLVM with the browser, or any other large exi

As others have already pointed out, this has been tried before. Turns out that some people are opposed to shipping LLVM with the browser, or any other large existing codebase. The reality is that WASM has to target the existing JavaScript backends in every popular browser. And now you can't use LLVM, because the backends in question typically only handle reducible control flow, etc. Conversion from LLVM to a form that your JavaScript backend supports is relatively expensive and not something you want to do on every load.