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rosyna's profile
Rosyna Keller
Rosyna Keller
Rosyna Keller
@rosyna

Rosyna Keller

@rosyna

A long time Mac developer that also Always Needs a Hug. Probably not a shoe. Cotidie Morimur

Joined February 2009
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    Previous Tweet
    1. Marcel Weiher ‏@mpweiher 19 Aug 2015

      @rosyna In my experience, low-level optimizations add up less than one might hope. @gte

      0 replies 0 retweets 0 likes
    2. Rosyna Keller ‏@rosyna 19 Aug 2015

      @mpweiher @gte I disagree and point to cfprefsd, Objective-C 2.0, pretty much all Foundation/CoreFoundation classes, and Metal as evidence.

      0 replies 0 retweets 0 likes
    3. Marcel Weiher ‏@mpweiher 19 Aug 2015

      @rosyna I don't recall Objective-C 2.0 improving performance much, if at all. Can you refresh my memory? @gte

      0 replies 0 retweets 2 likes
    4. Rosyna Keller ‏@rosyna 19 Aug 2015

      @mpweiher @gte Objective-C 2.0 allowed new optimizations to take place that weren't possible before due a backward compatibility requirement

      0 replies 0 retweets 0 likes
    5. Michael Tsai ‏@mjtsai 19 Aug 2015

      @rosyna Example?

      0 replies 0 retweets 0 likes
    6. Rosyna Keller ‏@rosyna 19 Aug 2015

      @mjtsai Things like non-pointer isa (http://www.sealiesoftware.com/blog/archive/2013/09/24/objc_explain_Non-pointer_isa.html …) wouldn't be possible if Class hadn't become opaque.

      0 replies 0 retweets 0 likes
    7. Rosyna Keller ‏@rosyna 19 Aug 2015

      @mjtsai Fast enumeration. non-fragile instance vars also means unused ivars can be removed from a class definition.

      0 replies 0 retweets 0 likes
    8. Michael Tsai ‏@mjtsai 19 Aug 2015

      @rosyna Why wouldn't fast enumeration have been possible before? Were there really a lot of unused ivars removed?

      0 replies 0 retweets 0 likes
    9. Rosyna Keller ‏@rosyna 19 Aug 2015

      @mjtsai Fast enumeration requires a lot of compiler support and it just happened to be an Objective-C 2.0 feature. https://www.mikeash.com/pyblog/friday-qa-2010-04-16-implementing-fast-enumeration.html …

      0 replies 0 retweets 0 likes
    10. Michael Tsai ‏@mjtsai 19 Aug 2015

      @rosyna Compiler support, yes. But I thought we were talking about breaking backward compatibility.

      0 replies 0 retweets 0 likes
      Rosyna Keller ‏@rosyna 19 Aug 2015

      @mjtsai Ah, in that specific case NSFastEnumeration was a new way without the trappings of being compatible with NSEnumerator.

      10:00 AM - 19 Aug 2015
      0 replies 0 retweets 0 likes
      1. Rosyna Keller ‏@rosyna 19 Aug 2015

        @mjtsai (yes, NSEnumerator conforms to NSFastEnumerator so it can be used with fast enumeration, without the speed increases)

        0 replies 0 retweets 0 likes
      2. Michael Tsai ‏@mjtsai 19 Aug 2015

        @rosyna But it didn’t break compatibility, and in fact NSEnumerator conforms to NSFastEnumeration (though probably not very fast).

        0 replies 0 retweets 0 likes

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