David Smith on Twitter: "@mjtsai @rentzsch the optimization only works if the callee tail-calls the autorelease. In that case it failed to generate a tail call."

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rentzsch ‏@rentzsch 30 Jan 2014

part of me still wants to write [NSMutableArray array] instead of [NSMutableArray new] since maayybbeee this code will be MRC one day again
5 likes
David Smith ‏@Catfish_Man 30 Jan 2014 Cupertino, CA

@rentzsch should be just as efficient under arc, so go for it :)
rentzsch ‏@rentzsch 30 Jan 2014

@Catfish_Man I think +array still hits the autorelease pool under ARC
David Smith ‏@Catfish_Man 30 Jan 2014 Cupertino, CA

@rentzsch I'll try to remember to check today and file a bug if it does
rentzsch ‏@rentzsch 30 Jan 2014

@Catfish_Man I love it but messaging sending is a serious conceptual barrier toward optimization
David Smith ‏@Catfish_Man 30 Jan 2014 Cupertino, CA

@rentzsch aye. I got [NSDate date] fixed to not hit the ar pool though :)
rentzsch ‏@rentzsch 30 Jan 2014

@Catfish_Man very interesting! I’m not sure how that’s possible unless you’re playing some sort of cacheing magic
David Smith ‏@Catfish_Man 30 Jan 2014 Cupertino, CA

@rentzsch grep for callerAcceptsFastAutorelease here: http://opensource.apple.com/source/objc4/objc4-532.2/runtime/NSObject.mm …
4 likes
rentzsch ‏@rentzsch 30 Jan 2014

turns out +[NSMutableArray array] and +[NSMutableArray new] should be near-equivalent in speed http://rentzsch.tumblr.com/post/75082194868/arcs-fast-autorelease … thanks @Catfish_Man
13 retweets 24 likes
Michael Tsai ‏@mjtsai 30 Jan 2014

@rentzsch @Catfish_Man That doesn’t explain the +[NSData date]/gettimeofday() special case, though.

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