Re: [RFC] JIT

On Friday, February 1, 2019 2:41:06 AM CST Dmitry Stogov wrote: > On 2/1/19 3:29 AM, Larry Garfield wrote: > > Question from a non-compiler-engineer: Could we end up in a situation > > where > > future language features (in 8.3 or something) are only performant on JIT- > > enabled platforms? I know there were some RFCs rejected in the past on > > the > > grounds that they involved too many runtime checks (and thus a performance > > hit); if it were possible for a JIT to optimize some of those away, it > > might make the cost acceptable. However, if a JIT only works on some > > systems that might widen the gap between have- and have-not platforms. > > I think, JIT only approach doesn't make a lot of sense for PHP, with one > of the most fast VM. And this is a trend. Even V8, starting from JIT > only, switched back to VM+JIT. > > Thanks. Dmitry. I'm... not sure how that answers my question? I'm saying "if we had a VM+JIT, and the JIT part made feature X acceptably fast but it wasn't acceptably fast with just the VM, is that a problem?" Or is that a situation that cannot happen? Or that we don't care if it happens? --Larry Garfield

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