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Interesting. Normal javascript has a "yield" directive, but I guess that it is not part of ASM.js. Is this something that ASM.js will eventually support?

Also, is Emterpreter really an interpreter, or do they still compile parts of the code to ASM.js for performance (e.g., parts that do not contain system calls)?

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The emterpreter is really an interpreter, but as you guessed, you can direct the compiler to compile parts of your code to ASM.js so that you can benefit from native-like performance for CPU-intensive parts of your app.

Yield is relatively new, part of ES6, and I think is tied into async/await. It might be possible to use it in combination with something like Babel, but I didn't go down that route. I think the way forward is SharedArrayBuffers and their blocking wait()s on futexes.

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