Greg Parker on Twitter: "@Catfish_Man @mjtsai @rentzsch Write a test that runs otool to disassemble and verifies those functions do not end with `ret` or `bx lr`."

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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.
David Smith ‏@Catfish_Man 30 Jan 2014 Cupertino, CA

@mjtsai @rentzsch the optimization only works if the callee tail-calls the autorelease. In that case it failed to generate a tail call.
1 like
Michael Tsai ‏@mjtsai 30 Jan 2014

@Catfish_Man @rentzsch There was something about calling gettimeofday() that messed up the normal tail call optimization?
David Smith ‏@Catfish_Man 30 Jan 2014 Cupertino, CA

@mjtsai @rentzsch yeah. Compilers are complicated apparently
Michael Tsai ‏@mjtsai 30 Jan 2014

@Catfish_Man @rentzsch Anything in particular that would cause the same problem with other POSIX API calls?
David Smith ‏@Catfish_Man 30 Jan 2014 Cupertino, CA

@mjtsai @rentzsch I can’t really guess. It’d be nice to have a “#error-if-not-tailcall” type of thing

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