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[SR-6880] synthesized ObjC constructors with struct parameters are not lowered properly on ARM VFP CC #49429

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compnerd opened this issue Jan 31, 2018 · 4 comments
Open

[SR-6880] synthesized ObjC constructors with struct parameters are not lowered properly on ARM VFP CC #49429

compnerd opened this issue Jan 31, 2018 · 4 comments
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arm Architecture: any ARM armhf Architecture: the Debian port for ARM processors (armv7+) that have hardware floating point support bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself swift 4.0 Windows Platform: Windows

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@compnerd
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Previous ID SR-6880
Radar None
Original Reporter @compnerd
Type Bug
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, Swift4, Windows, arm, armhf, linux
Assignee None
Priority Medium

md5: 61a8547c2722f009225e364a21a95711

Issue Description:

When materializing the implicit constructor containing a HFA, the VFP CC will result in an incorrect attempt to coerce parameters to the structure type. This causes an assertion in LLVM as we attempt to store a structure value into the alloca when trafficking through memory.
@compnerd
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There is a test case for this in PR14304

@belkadan
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belkadan commented Feb 1, 2018

Aside: why the "Swift4" label?

@compnerd
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compnerd commented Feb 2, 2018

Oh, that is because it shows up in Swift 4 and newer I believe. Is that keyword meant for something else?

@belkadan
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belkadan commented Feb 2, 2018

I don't think anyone uses it at all (though it is on a few other bugs). It's interesting to know when something was a regression (4.0Regression, 4.1Regression, etc), but not usually when it's a new feature that just never worked under certain conditions.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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arm Architecture: any ARM armhf Architecture: the Debian port for ARM processors (armv7+) that have hardware floating point support bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself swift 4.0 Windows Platform: Windows
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@compnerd @belkadan