Re: Future of Cocoa
Re: Future of Cocoa
- Subject: Re: Future of Cocoa
- From: Jens Alfke via Cocoa-dev <email@hidden>
- Date: Wed, 20 Nov 2019 17:01:58 -0800
> On Nov 20, 2019, at 2:46 PM, Saagar Jha <email@hidden> wrote:
>
> I am curious why this optimization went in instead of guarded speculative
> inlining, which would let you keep dynamism.
If I understand it correctly, that only 'inlines' (really caches) the resolved
method address for the call site. That's not much of a win in Obj-C where
method lookup is already quite fast.
The real win comes with literally inlining the method at compile time.
Link-Time Optimization allows _any_ method anywhere in the program to be
inlined, provided the call is monomorphic. And this new feature allows
monomorphic method calls in Obj-C. This is a big win for small method like
getters/setters, and for methods with only one call site (i.e. where you factor
out a method for readability even though it's only used in one place.)
—Jens
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