Le 1 nov. 2013 à 08:38, Gerriet M. Denkmann gerr...@mdenkmann.de a écrit :
Messing with an iPhone app (iOS 7.0.3) Release build on Xcode Version 5.0.1
(5A2053) I noticed that by switching Arc off in two crucial files the speed
of some operation almost doubled.
So: are there any rules of thumb what to do and what not to do to avoid an
Arc slowdown?
Or: are there situations in which Arc is better not used?
Yes, when profiling tells you it is in a hot path.
The compiler is conservative and anytime it has some doubt, it will
retain/release an object.
If profiling shows some that code where you now it is safe to avoid this
additional retain/release is hot, you can help the compiler by using
__unsafe_unretain to annotate the managed variable.
-- Jean-Daniel
___
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
