April 10 2014 Meeting Notes
wingo at igalia.com
Tue Apr 29 00:32:00 PDT 2014
On Fri 25 Apr 2014 17:14, Filip Pizlo <fpizlo at apple.com> 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
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