Joe Groff on Twitter: "@mjtsai @phink0 @mpweiher @wilshipley Does x.lazy.filter to avoid the intermediate array construction improve more?"

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Wil Shipley ‏@wilshipley May 28 San Francisco, CA

@mpweiher @phink0 It’s not so hard but also not so fast. Swift is VERY fast and efficient, because it knows the types.
Marcel Weiher ‏@mpweiher May 28

@wilshipley @phink0 [fast] Is this something you expect or something you measured? My measurements to date almost exclusively show opposite.
2 likes
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
Joe Groff ‏@jckarter May 29

@mjtsai @phink0 @mpweiher @wilshipley Would be interesting to compare with x.utf16.startsWith(y.utf16) to see if that's the case.
Michael Tsai ‏@mjtsai May 29

@jckarter @phink0 @mpweiher @wilshipley In XCTest, I found ($0 as NSString) only 5% faster and $0.utf16.startswith 34% faster.
2 likes

‏@jckarter

@mjtsai @phink0 @mpweiher @wilshipley Does x.lazy.filter to avoid the intermediate array construction improve more?

6:55 AM - 29 May 2016

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