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[SR-6903] Swift 3.2 very long compile time with nil coalescing #49452

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swift-ci opened this issue Feb 2, 2018 · 2 comments
Open

[SR-6903] Swift 3.2 very long compile time with nil coalescing #49452

swift-ci opened this issue Feb 2, 2018 · 2 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself performance type checker Area → compiler: Semantic analysis

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@swift-ci
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swift-ci commented Feb 2, 2018

Previous ID SR-6903
Radar None
Original Reporter Nicolas Buquet (JIRA User)
Type Bug

Attachment: Download

Environment

MacBook Pro Core i7 2.9 GHz, 16 GB, Xcode 9.2 (9C40b)

Apple Swift version 4.0.3 (swiftlang-900.0.74.1 clang-900.0.39.2)
Target: x86_64-apple-macosx10.9

Swift Compiler - Language: SWIFT_VERSION set to 'Swift 3.2'

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, Performance, TypeChecker
Assignee None
Priority Medium

md5: e30045bb341aa225f42e4f2d13bb399d

Issue Description:

Swift is very long to compile this simple file (more than 40 seconds).

Passing to "Quick version" in the file (no ternary operator) makes the compilation immediate.
@belkadan
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belkadan commented Feb 2, 2018

@rudkx, where are you collecting these? Looks like some of the cases we know.

@keith
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keith commented Sep 3, 2020

FYI this in general is still an issue, another example:

let a: String? = nil
print(a ?? a ?? a ?? a ?? a ?? a ?? a ?? a ?? a)

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself performance type checker Area → compiler: Semantic analysis
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@keith @belkadan @swift-ci