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[SR-12062] Swift compiler slow when SignedNumeric is used inside closure #54498

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swift-ci opened this issue Jan 21, 2020 · 1 comment
Open

[SR-12062] Swift compiler slow when SignedNumeric is used inside closure #54498

swift-ci opened this issue Jan 21, 2020 · 1 comment
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself performance

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@swift-ci
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Previous ID SR-12062
Radar rdar://problem/58997099
Original Reporter ipos (JIRA User)
Type Bug

Attachment: Download

Environment

Apple Swift version 5.1.3 (swiftlang-1100.0.282.1 clang-1100.0.33.15)

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

md5: 32fc33dd059780912b48deddad38dff8

Issue Description:

Swift compiler is considerably slow when SignedNumeric is used inside closure (might be because of overflow handling?).

Following simple code is taking about 70ms on my machine:

func test() {
    { //70ms here with OTHER_SWIFT_FLAGS="-Xfrontend -debug-time-expression-type-checking"
        let x: Int = 100
        -x
    }()
}

By removing the negation operator ('-') drops to mere ~1.6ms

AST and SIL after SILGen are attached just in case
@beccadax
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@swift-ci create

@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
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@beccadax @swift-ci @AnthonyLatsis