[Sephr]

That's quite an impressive implementation! I didn't realize hand-written asm.js could be that readable.

[s-macke]

Yes, more or less. Every operation must be written, that the type is obvious for the compiler. And you have one array, the heap with some special index rules. For example: (r[((ins >> 9) & 0x7C)>>2]|0 The >>2 and |0 is necessary.