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[WIP] Runtime: Put ObjC class wrapper unwrapping behind a runtime call. #12732

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Merged
merged 1 commit into from
Nov 6, 2017
Merged

[WIP] Runtime: Put ObjC class wrapper unwrapping behind a runtime call. #12732

merged 1 commit into from
Nov 6, 2017

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jckarter
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@jckarter jckarter commented Nov 2, 2017

This is a small code size win, and also gives us some abstraction so that future cooperative ObjC compilers/runtimes might be able to interoperate ObjC class objects with Swift type metadata efficiently than they currently are in the fragile Swift runtime.

While I'm here, I also noticed that swift_getObjCClassMetadata was unnecessarily getting exposed in non-ObjC-interop runtime builds, so I fixed that as well.

[WIP] while performance impact is measured.

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jckarter commented Nov 2, 2017

@swift-ci Please test

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jckarter commented Nov 2, 2017

@swift-ci Please benchmark

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swift-ci commented Nov 3, 2017

Build failed
Swift Test OS X Platform
Git Sha - ba5145f48552b573a33a44ade48bc6e5753238e4

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swift-ci commented Nov 3, 2017

Build comment file:

Optimized (O)

Regression (2)
TEST OLD NEW DELTA SPEEDUP
CaptureProp 3719 4006 +7.7% 0.93x (?)
LazilyFilteredArrayContains 18033 19219 +6.6% 0.94x (?)
Improvement (1)
TEST OLD NEW DELTA SPEEDUP
Chars 596 567 -4.9% 1.05x (?)
No Changes (331)
TEST OLD NEW DELTA SPEEDUP
AngryPhonebook 2766 2761 -0.2% 1.00x (?)
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ObjectiveCBridgeStubToArrayOfNSString 26995 27244 +0.9% 0.99x (?)
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ObjectiveCBridgeStubToNSDateRef 3047 3075 +0.9% 0.99x (?)
ObjectiveCBridgeStubToNSString 1403 1416 +0.9% 0.99x (?)
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Unoptimized (Onone)

Regression (2)
TEST OLD NEW DELTA SPEEDUP
ArrayOfPOD 671 747 +11.3% 0.90x
ArrayOfGenericPOD 1218 1302 +6.9% 0.94x
Improvement (2)
TEST OLD NEW DELTA SPEEDUP
ObjectiveCBridgeStubDateMutation 721 608 -15.7% 1.19x
ObjectiveCBridgeFromNSSetAnyObjectToStringForced 73380 66973 -8.7% 1.10x (?)
No Changes (330)
TEST OLD NEW DELTA SPEEDUP
AngryPhonebook 4734 4750 +0.3% 1.00x (?)
AnyHashableWithAClass 80960 81200 +0.3% 1.00x (?)
Array2D 620234 605266 -2.4% 1.02x
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Hardware Overview 
  Model Name: Mac mini
  Model Identifier: Macmini7,1
  Processor Name: Intel Core i7
  Processor Speed: 3 GHz
  Number of Processors: 1
  Total Number of Cores: 2
  L2 Cache (per Core): 256 KB
  L3 Cache: 4 MB
  Memory: 16 GB

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jckarter commented Nov 3, 2017

@eeckstein Do the benchmark numbers look acceptable? Hard to tell whether .9 is inside the noise floor or not.

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Runtime: Put ObjC class wrapper unwrapping behind a runtime call.
95d2510 
This is a small code size win, and also gives us some abstraction so that future cooperative ObjC compilers/runtimes might be able to interoperate ObjC class objects with Swift type metadata efficiently than they currently are in the fragile Swift runtime.

While I'm here, I also noticed that swift_getObjCClassMetadata was unnecessarily getting exposed in non-ObjC-interop runtime builds, so I fixed that as well.
@jckarter jckarter force-pushed the objc-class-metadata-unwrapping branch from ba5145f to 95d2510 Compare November 3, 2017 17:19
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jckarter commented Nov 3, 2017

@swift-ci Please test

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jckarter commented Nov 3, 2017

@swift-ci Please test

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jckarter commented Nov 3, 2017

@swift-ci Please test source compatibility

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jckarter commented Nov 3, 2017

@swift-ci Please test source compatibility

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swift-ci commented Nov 3, 2017

Build failed
Swift Test OS X Platform
Git Sha - 95d2510

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jckarter commented Nov 4, 2017

@swift-ci please test os x

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The benchmark numbers are totally reasonable (and probably noise at all).

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jckarter commented Nov 6, 2017

Thanks Erik!

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jckarter commented Nov 6, 2017

@swift-ci Please test source compatibility

@jckarter jckarter merged commit f8aef0a into swiftlang:master Nov 6, 2017
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@jckarter @swift-ci @eeckstein