Swift Performance

Swift Optimization Tips

Transcript

1. Swift Performance
2. https://github.com/kishikawakatsumi/ kishikawa katsumi http://kishikawakatsumi.hatenablog.com/ Realm
3. ࠷దԽͷલʹ ʮૣ͗͢Δ࠷దԽ͸ॾѱͷࠜݯͰ͋Δʯ
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5. ܭଌ͢Δ
6. ܭଌ͢Δ func measure(call: () -> Void) { let startTime = CACurrentMediaTime() call() let endTime = CACurrentMediaTime() print("Time - \(endTime - startTime)") }
7. ܭଌ͢Δ func measure(call: () -> Void) { let startTime = CACurrentMediaTime() call() let endTime = CACurrentMediaTime() print("Time - \(endTime - startTime)") } measure { // Heavy task }
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11. ࠷దԽΛ֬ೝ͢Δʹ͸ $ xcrun swiftc --help OVERVIEW: Swift compiler USAGE: swiftc [options] <inputs> MODES: -dump-ast Parse and type-check input file(s) and dump AST(s) -dump-parse Parse input file(s) and dump AST(s) -dump-type-refinement-contexts Type-check input file(s) and dump type refinement contexts(s) -emit-assembly Emit assembly file(s) (-S) -emit-bc Emit LLVM BC file(s) -emit-executable Emit a linked executable -emit-ir Emit LLVM IR file(s) ...
12. ࠷దԽΛ֬ೝ͢Δʹ͸ ˖
    
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13. ࠷దԽΛ֬ೝ͢Δʹ͸ $ xcrun swiftc -emit-sil sourceFile.swift -o outputFile
14. finalΛ࢖͏ final class ... final var ... final func ...
15. privateΛ࢖͏ private class ... private var ... private func ...
16. finalΛ࢖͏ ˖ ⹛涸ر؍أػحث׾鼘ֽ׷
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18. Reference TypeΑΓValueTypeΛ࢖͏ struct NumberValue { let x: Int } class NumberReference { let x: Int init(x: Int) { self.x = x } }
19. Reference TypeΑΓValueTypeΛ࢖͏ ... callq __TFV3out11NumberValueCfMS0_FT1xSi_S0_ movq %rax, -16(%rbp) movq -48(%rbp), %rdi addq %rax, %rdi ...
20. Reference TypeΑΓValueTypeΛ࢖͏ ... callq __TFC3out15NumberReferenceCfMS0_FT1xSi_S0_ movq %rax, -32(%rbp) movq -144(%rbp), %rdi movq %rax, -160(%rbp) callq _swift_release ...
21. Reference TypeΑΓValueTypeΛ࢖͏ ... callq __TFC3out15NumberReferenceCfMS0_FT1xSi_S0_ movq %rax, -32(%rbp) movq -144(%rbp), %rdi movq %rax, -160(%rbp) callq _swift_release ...
22. ReferenceTypeΛ഑ྻʹೖΕΔ৔߹͸ContiguousArrayΛ࢖͏͜ͱΛݕ౼͢Δ ˖ 3FGFSFODF5ZQF׾ꂁ⴨חⰅ׸׷㜥さכ$POUJHVPVT"SSBZ׾⢪ֲֿה׾嗚 鎢ׅ׷ ഑ྻʹReferece TypeΛ֨ೲ͢ΔͷΛආ͚Δ IUUQTHJUIVCDPNBQQMFTXJGUCMPCNBTUFSEPDT0QUJNJ[BUJPO5JQTSTU // Don't use a class here. struct PhonebookEntry { var name : String var number : [Int] } var a : [PhonebookEntry]
23. ഑ྻʹReferece TypeΛ֨ೲ͢ΔͷΛආ͚Δ IUUQTHJUIVCDPNBQQMFTXJGUCMPCNBTUFSEPDT0QUJNJ[BUJPO5JQTSTU ReferenceTypeΛ഑ྻʹೖΕΔ৔߹͸ContiguousArrayΛ࢖͏͜ͱΛݕ౼͢Δ ˖ 3FGFSFODF5ZQF׾ꂁ⴨חⰅ׸׷㜥さכ$POUJHVPVT"SSBZ׾⢪ֲֿה׾嗚 鎢ׅ׷ class C { ... } var a: ContiguousArray<C> = [C(...), C(...), ..., C(...)]
24. Objective-CΛආ͚Δ ˖ ⹛涸ر؍أػحثָ涪欰ׅ׷
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25. SwiftͷίʔυΛObjective-Cʹެ։͠ͳ͍ ˖ ⹛涸ر؍أػحثָ涪欰ׅ׷
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26. ஗ԆʢLazyʣͤ͞Δ
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28. LazyCollection let numbers = Array(1...1000) let doubledNumbers = numbers.map { $0 * 2 } doubledNumbers.last
29. LazyCollection
30. LazyCollection let numbers = Array(1...1000) let lazyNumbers = numbers.lazy let doubledNumbers = lazyNumbers.map { $0 * 2 } doubledNumbers.last let lazyNumbers2 = LazyCollection(numbers) let doubledNumbers2 = lazyNumbers.map { $0 * 2 } doubledNumbers2.last
31. LazyCollection
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