On Fri 25 Apr 2014 17:14, Filip Pizlo <[email protected]> writes: > It's just a matter of common sense that JS implementations move to > totally-free entry/exit into try-catch and a sensible cost model for > when you throw, regardless of how this proposal goes. The fact that > either of these things is a performance cliff is simply a bug and it > will likely be fixed soon, given the pace of JS VM evolution.
You are right. I can't help but feel nervous, though, at all the optimization stars that have to align to get good for-of performance. Scalar replacement, now (maybe) a rework of try/finally (a gnarly subsystem if there ever was one), and god forbid generators enter the mix. How long until we can honestly say "just use for-of, you'll have great perf"? I can't see it happening any time within the next couple of years... Andy _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
