Joe Groff on Twitter: "@mpweiher @phink0 @wilshipley Regardless, even with naive comparison it looks like @mjtsai still sees a >3x diff."

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Marco Scheurer ‏@phink0 May 29

@mpweiher @wilshipley What am I doing wrong? Swift 6x slower than very naive ObjC filter. XCode7.3.1, [-O], iPhone5Spic.twitter.com/U20uvcRPFj
3 retweets 9 likes
Marcel Weiher ‏@mpweiher May 29

@phink0 @wilshipley That looks about smack in the middle of the relative slowdowns I have been seeing.
1 like
Michael Tsai ‏@mjtsai May 29

@mpweiher @phink0 @wilshipley That’s very interesting. Have you tried profiling it? Bridging overhead?
Marco Scheurer ‏@phink0 May 29

@mjtsai @mpweiher @wilshipley Here's the profile (and for completeness the ObjC simple/naive/ugly filter category)pic.twitter.com/lbeIS8sEg8
1 like
Michael Tsai ‏@mjtsai May 29

@phink0 @mpweiher @wilshipley The Foundation -hasPrefix: does an exact compare; maybe Swift stdlib one does a fancy Unicode compare.
Joe Groff ‏@jckarter May 29

@mjtsai @phink0 @mpweiher @wilshipley Yeah. Some Unicode operations are also implemented naively and make unnecessary extra copies.
2 likes
Marcel Weiher ‏@mpweiher May 29

@jckarter @mjtsai @phink0 @wilshipley Dunno, I see “CFStringFindWithOptionsAndLocale()” in the profile and also when I profile -hasPrefix:
Joe Groff ‏@jckarter May 29

@mpweiher @mjtsai @phink0 @wilshipley By "naive" I mean "copy into a CF string and hand off to a CF fn". Super naive
Marcel Weiher ‏@mpweiher May 29

@jckarter @mjtsai @phink0 @wilshipley I was replying more to the “fancy unicode vs. exact”, AFAICT they do the same.
Joe Groff ‏@jckarter May 29

@mpweiher @mjtsai @phink0 @wilshipley The same CF takes a bunch of flags to enable different behaviors.
1 like

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