This is lower-level. It is JavaScript, but really it is a subset that implements low-level operations. In fact lower than PNaCl, this is past the LLVM IR level.
I bet if you rewrote the spec to use a different syntax, and didn't mention that it (syntax aside) is a subset of JS, people would be falling over themselves to say "finally, proper bytecode for the web!"
So will there be code to turn LLVM IR into asm.js stuff? That would be pretty awesome (and a nice way to make Emscripten more accessible to other languages?).
> So will there be code to turn LLVM IR into asm.js stuff?
There already is, that is precisely what emscripten does when run with the ASM_JS=1 flag set. Emscripten's input is LLVM IR, not C or C++. (Although, it has been mostly tested on LLVM IR generated from clang that was given C or C++.)
