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Unnecessary retain/release pair around closure

ARCFeature: automatic reference countingFeature: automatic reference counting

closuresFeature: closuresFeature: closures

compilerThe Swift compiler itselfThe Swift compiler itself

expressionsFeature: expressionsFeature: expressions

performance

SILOptimizerArea → compiler: SIL optimization passesArea → compiler: SIL optimization passes

swift 6.2

Status: Open.

Bug

#82155 In swiftlang/swift;

· eeckstein opened on Jun 10, 2025

Large-ish literal array of Ints consumes 100GB of memory to compile, crashes system

array literalsFeature → expressions → literals: Array literalsFeature → expressions → literals: Array literals

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

compilerThe Swift compiler itselfThe Swift compiler itself

expressionsFeature: expressionsFeature: expressions

literalsFeature → expressions: Literals such as an integer or string literalFeature → expressions: Literals such as an integer or string literal

performance

swift 6.2

type checkerArea → compiler: Semantic analysisArea → compiler: Semantic analysis

Status: Open.

#79481 In swiftlang/swift;

· GarthSnyder opened on Feb 19, 2025

Redundant overflow check in a simple 3-line function

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

optimized onlyFlag: An issue whose reproduction requires optimized compilationFlag: An issue whose reproduction requires optimized compilation

performance

Status: Open.

#77195 In swiftlang/swift;

· glessard opened on Oct 23, 2024

Embedded Swift compiler emits explicit loop instead of memmove()

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

compilerThe Swift compiler itselfThe Swift compiler itself

embeddedEmbedded SwiftEmbedded Swift

performance

SILOptimizerArea → compiler: SIL optimization passesArea → compiler: SIL optimization passes

swift 6.1

unexpected behaviorBug: Unexpected behavior or incorrect outputBug: Unexpected behavior or incorrect output

Status: Open.

#75729 In swiftlang/swift;

· michael-jan opened on Aug 6, 2024

Swift 6 compilation performance regression

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

performance

type checkerArea → compiler: Semantic analysisArea → compiler: Semantic analysis

Status: Open.

#75107 In swiftlang/swift;

· NachoSoto opened on Jul 9, 2024

Super-linear compilation times if source file contains thousands of top-level LOC

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

compilerThe Swift compiler itselfThe Swift compiler itself

performance

script modeFlag: Specific to script mode compilationFlag: Specific to script mode compilation

unexpected behaviorBug: Unexpected behavior or incorrect outputBug: Unexpected behavior or incorrect output

Status: Open.

#72661 In swiftlang/swift;

· VAndrJ opened on Mar 27, 2024

TaskGroup needs a better data structure

concurrency runtimeFeature: umbrella label for concurrency runtime featuresFeature: umbrella label for concurrency runtime features

ConcurrencуArea → standard library: The `Concurrency` module under the standard library umbrellaArea → standard library: The `Concurrency` module under the standard library umbrella

featureA feature request or implementationA feature request or implementation

performance

Status: Open.

#71212 In swiftlang/swift;

· za-creature opened on Jan 29, 2024

Program is several times slower when compiled with swiftc than when compiled with XCode due to retain&release calls

ARCFeature: automatic reference countingFeature: automatic reference counting

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

classFeature → type declarations: Class declarationsFeature → type declarations: Class declarations

compilerThe Swift compiler itselfThe Swift compiler itself

declarationsFeature: declarationsFeature: declarations

performance

run-time performance

SILOptimizerArea → compiler: SIL optimization passesArea → compiler: SIL optimization passes

type declarationsFeature → declarations: Type declarationsFeature → declarations: Type declarations

unexpected behaviorBug: Unexpected behavior or incorrect outputBug: Unexpected behavior or incorrect output

Status: Open.

#70745 In swiftlang/swift;

· yakubin opened on Jan 5, 2024

Marking synchronous implementation of AsyncIteratorProtocol with "await" makes it much slower

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

concurrencyFeature: umbrella label for concurrency language featuresFeature: umbrella label for concurrency language features

performance

Status: Open.

#70484 In swiftlang/swift;

· saagarjha opened on Dec 15, 2023

Optimiser performs worse on lazy Collections/Sequences than for-in-loop versions

bugA deviation from expected or documented behavior. Also: expected but undesirable behavior.A deviation from expected or documented behavior. Also: expected but undesirable behavior.

performance

SILOptimizerArea → compiler: SIL optimization passesArea → compiler: SIL optimization passes

Status: Open.

#69751 In swiftlang/swift;

· wadetregaskis opened on Nov 9, 2023

Investigate possible optimization opportunities for autodiff code with control flow

AutoDiff

compilerThe Swift compiler itselfThe Swift compiler itself

featureA feature request or implementationA feature request or implementation

performance

run-time performance

SILOptimizerArea → compiler: SIL optimization passesArea → compiler: SIL optimization passes

Status: Open.

#68901 In swiftlang/swift;

· asl opened on Oct 2, 2023

[AutoDiff] Refine pullback generation logic for reference-based types

AutoDiff

performance

Status: Open.

#67867 In swiftlang/swift;

· asl opened on Aug 10, 2023