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I am sure there is some reason this can't be done, but can we compile JavaScript to asm.js? If this can be done with C, it can be done with JS?

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Sure, but it's different because you need to compile a whole VM to asm.js and run javascript inside of it. You can't compile a dynamic language like javascript to low-level code because you need too much information at runtime.

See this project, which compiles SpiderMonkey to javascript via emscripten, which supports asm.js: https://github.com/jterrace/js.js/

qt-emscripten does something similar, it builds the JSC interpreter together with Qt.

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