SwiftとCPUレジスタ

by rikusouda

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SwiftͱCPUϨδελ 2019/06/24 YUMEMI.swift #1 @rikusouda

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ࣗݾ঺հ • @rikusouda (٢Ԭ༞थ) • גࣜձࣾGunosy • ϧʔτϏΞ͕޷͖ • WWDC19͕ॳWWDC

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Swiftͱ CPUϨδελ

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ͳͥWWDC͔ΒϨδελͷ࿩? • WWDCʹ͸Lab͕͋ΔɻAppleͷΤϯδχΞ ʹ࣭໰͕Ͱ͖Δ৔ॴ • Swiftؔ࿈ͷLabߦ͖ͬͯͨ • ղܾͰ͖ͳ͔ͬͨ͜ͱ͕͋Γɺ೔ຊʹؼͬͯ ͖͔ͯΒࣗ෼Ͱௐ΂ͨ

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CPUϨδελͬͯԿ͚ͩͬ • ԋࢉ͢Δͱ͖ʹ࢖͏࡞ۀྖҬ = ൚༻Ϩδελ • CPUͷ಺෦ʹ͋ͬͯɺϝΠϯϝϞϦΑΓܻҧ ͍ʹૣ͍ • ͨͩ͠਺ेݸͱ͔ɺ਺͕ݶΒΕ͍ͯΔ • Ϩδελʹͳ͍σʔλΛԋࢉ͢Δͱ͖͸ϝΠϯ ϝϞϦ͔ΒҰ୴ϩʔυ͢Δ

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୊ࡐͷSwiftίʔυ

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͜͏͍͏஋ܕͷม਺͸ ʮελοΫͷϝϞϦྖҬʹ֬อ ͞ΕΔʯͱ͍͏ͷ͸༗໊ ୊ࡐͷSwiftίʔυ

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ϝΠϯϝϞϦ࢖ΘͣʹϨδελ ͚ͩ࢖ͬͨ΄͏͕ޮ཰Α͘ͳ͍ ͦ͏ͳ͍ͬͯΔ ୊ࡐͷSwiftίʔυ

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LabͰฉ͍ͯΈͨ • SwiftͷLabʹͯ • A. SwiftίϯύΠϥνʔϜͰ͸୲౰͍ͯ͠ͳ͍ൣғɻ LLVMͷਓʹฉ͘ͱΑͦ͞͏ • LLVMͷLabʹͯ • A. Swift͸Θ͔Βͳ͍ɻCݴޠͩͱ͢ΔͱYesɻLLVM IRͱ͔ΞηϯϒϥಡΉͱ͍Ζ͍ΖΘ͔ͬͯ໘ന͍Α

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LLVM IRͱΞηϯϒϥͱ͸ http://llvm.org/devmtg/2015-10/slides/GroffLattner-SILHighLevelIR.pdf

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LLVM IRͱΞηϯϒϥͱ͸ http://llvm.org/devmtg/2015-10/slides/GroffLattner-SILHighLevelIR.pdf

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LLVM IRݟͯΈΑ͏

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Swiftίʔυ

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swiftc -emit-ir -O test.swift > test.ll ௨ৗɺϦϦʔεϏϧυ͸࠷ద Խ͢ΔͷͰಉ༷ʹ࠷దԽ

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࠷దԽ͞Ε͗͢!!

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Swiftίʔυ

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Swiftίʔυ ϝιουͷࢀরܦ༝ͷݺͼग़͠ʹ͠ ͯؔ਺ίʔϧ͕ͳ͘ͳΔͷΛආ͚Δ

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swiftc -emit-ir -O test.swift > test.ll

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LLVM IRίʔυ(barؔ਺಺)

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LLVM IRίʔυ(barؔ਺಺) ͷؔ਺Λίʔϧ݁͠ՌΛ΁ GPPؔ਺ͷϙΠϯλ͕ʹೖ͍ͬͯΔ

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LLVM IRίʔυ(barؔ਺಺) ʹΛ଍ͯ͠ɺ໭Γ஋Λʹ

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LLVM IRίʔυ(barؔ਺಺) !MMWNTBEEXJUIPWFSqPXJͷ໭Γ஋ ߏ଄ମ͔Βܭࢉ݁ՌΛऔΓग़͠ɺ ͦΕΛ໭Γ஋ͱͯ͠SFUVSO

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Α͛͞

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೦ͷҝΞηϯϒϥ΋ݟΑ͏  iPhoneΛ૝ఆ͠ARM64Ͱ

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xcrun -sdk iphoneos swiftc - emit-assembly -O -target arm64- apple-ios12.0 test.swift > test.s ͜ͷίϚϯυ͕ϕετͳͷ͔ ࣗ৴͕ͳ͍ͷͰϚαΧϦืू

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ARM64ͷ Ξηϯϒϥ

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Y ΛҾ਺ͱͯ͠YʹඈͿ Yʹ͸GPPͷΞυϨε͕ೖ͍ͬͯΔ

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໭Γ஋ Y ΛYʹίϐʔ

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YY ϨδελͱϦςϥϧͷՃࢉ ϝϞϦΞΫηεͳ͠

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YΛ໭Γ஋ͱͯ͠SFUVSO

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Swiftͷؔ਺಺ͷInt͸ ϨδελͰ׬͍݁ͯͨ͠

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͜Ε͔Β • LLVMίʔυΛݟͯཪ෇͚͕Ͱ͖͍ͯͳ͍ͷͰ ΍Γ͍ͨ • ↑͜͜·Ͱ΍ͬͯiOSDCͷLTͰ஻Γ͍ͨ

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ϓϩϙʔβϧʹελʔ͍ͩ͘͞ • SwiftͷελοΫม਺ͱCPUϨδελͷؔ܎ΛಡΈղ͍ͨ • https://fortee.jp/iosdc-japan-2019/proposal/ c2a89fff-ce66-4821-b2d4-4b7b6ff293d5 • Swiftͷ஌ࣝΛ࢖ͬͯC++ͷੈքʹඈͼࠐ΋͏ • https://fortee.jp/iosdc-japan-2019/proposal/ c39e331a-8c70-42ef-b58e-38f798f40295 • “rikusouda”Ͱݕࡧ͢Ε͹ग़͖ͯ·͢

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·ͱΊ • Swiftͷ಺෦ಈ࡞Λ஌Γ͍ͨ৔߹͸தؒίʔυ ΛಡΉ͚ͩͰ݁ߏ෼͔Δɻ • ໋ྩͷ࢓༷ͱ͔άάΕ͹݁ߏಡΊΔ • ίϯύΠϥͷ஌ࣝͳͯ͘΋͜͜·Ͱ͸ߦ͚Δ • SwiftͷInt͸ɺҰൠతʹ࠷దԽ͋ΓͳΒ͹Ϩδ ελͰ׬݁͢Δ͜ͱ͕Θ͔ͬͨ

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