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[SR-4332] Review interacting with enum discriminator through the witness table #46915

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bob-wilson opened this issue Mar 24, 2017 · 3 comments
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affects ABI Flag: Affects ABI compiler The Swift compiler itself runtime The Swift Runtime task

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@bob-wilson
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Previous ID SR-4332
Radar rdar://problem/31408033
Original Reporter @bob-wilson
Type Task
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Task, AffectsABI, Runtime
Assignee @aschwaighofer
Priority Medium

md5: e442adb143a8f1f5e41463146abc2a5a

Issue Description:

As part of ABI stability, we should review the efficiency of interacting with the enum discriminator through the witness table

@bob-wilson
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From the ABI Stability manifesto: "The value witness table stores whether a type is trivial and/or bitwise movable, whether there are extra inhabitants and if so how to store and retrieve them, etc. For enums, the value witness table will also provide functionality for interacting with the discriminator. There may be more efficient ways of representing enums that simplify this functionality (or provide a fast path), and that's under investigation"

@bob-wilson
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@swift-ci create

@aschwaighofer
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This is done
#12697

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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Labels
affects ABI Flag: Affects ABI compiler The Swift compiler itself runtime The Swift Runtime task
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