It's an IR that currently is compatible with JS, but that's not necessarily the case longterm. And I personally don't see how it can retain that property while

It's an IR that currently is compatible with JS, but that's not necessarily the case longterm. And I personally don't see how it can retain that property while adding some of the things the platform needs (e.g. thread support that works for existing codebases). I asked dherman this elsewhere in the thread, and it seems like diverging from JS hasn't been ruled out. https://news.ycombinator.com/item?id=6023902 https://news.ycombinator.com/item?id=6023902 So, my concern here is that asm.js will either be forced to diverge from JS to make it generally useful, or it will need to add APIs to JS that are not appropriate outside of asm.js. If it gets to that place, then I feel that the compromises necessary for asm.js were a waste, and it would have clearly been better to just introduce a new IR that wasn't bound by the constraints of asm.js.