Re: Future of Cocoa
Re: Future of Cocoa
- Subject: Re: Future of Cocoa
- From: Jean-Daniel via Cocoa-dev <email@hidden>
- Date: Mon, 16 Dec 2019 09:16:24 +0100
> Le 16 déc. 2019 à 06:05, Saagar Jha <email@hidden> a écrit :
>
> It’s been a while, but I just thought you both might be interested in some
> follow-up I did for this idea. I implemented it for fun in clang
> <https://github.com/saagarjha/expresscall> and it turns out that it’s a
> pretty decent performance win
> <https://saagarjha.com/blog/2019/12/15/bypassing-objc-msgsend/> over
> objc_msgSend, both because it dispatches faster and because the compiler can
> do a full inline through it.
Yes, but you don't preserve the objc_msgSend semantic.
If I understand you code correctly, all you do is checking if it is the same
ISA, which does not guarantee in anyway that the selector did not change since
the previous call.
As classes are fully dynamic and methods can be swizzle, you must perform a
full IMP lookup for every calls, which complexly defeat the purpose of inline
caching.
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