Wil Shipley
For those asleep at 2am: I blogged about Swift in my normal bombastic style which isn’t getting old, nope. http://blog.wilshipley.com/2016/05/pimp-my-code-book-2-swift-and-dynamism.html …
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@phink0@wilshipley That looks about smack in the middle of the relative slowdowns I have been seeing.
Marco Scheurer
Marcel Weiher
Michael Tsai@mpweiher @phink0 @wilshipley That’s very interesting. Have you tried profiling it? Bridging overhead?
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@mjtsai@mpweiher@wilshipley Here's the profile (and for completeness the ObjC simple/naive/ugly filter category)pic.twitter.com/lbeIS8sEg8
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@phink0@mpweiher@wilshipley The Foundation -hasPrefix: does an exact compare; maybe Swift stdlib one does a fancy Unicode compare. -
@mjtsai@phink0@mpweiher@wilshipley Yeah. Some Unicode operations are also implemented naively and make unnecessary extra copies. - View other replies
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@jckarter@mjtsai@phink0@wilshipley Dunno, I see “CFStringFindWithOptionsAndLocale()” in the profile and also when I profile -hasPrefix: - View other replies
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@mpweiher@jckarter@phink0@wilshipley If you look at the code, Swift is using kCFCompareNonliteral and NSString is not. -
@mjtsai@jckarter@phink0@wilshipley I no longer have access to Foundation source code… -
@mpweiher@jckarter@phink0@wilshipley You can see in Hopper that it’s only passing NSAnchoredSearch. -
@mjtsai@jckarter@phink0@wilshipley Just ran some tests and kCFCompareNonliteral does not make a difference with simple prefix comparison
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Joe Groff
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