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more efficient comparisons of optional unsafe pointers or class references

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

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

swift 6.2

Status: Open.

#83423 In swiftlang/swift;

· eeckstein opened on Jul 30, 2025

Spurious "Switch condition evaluates to a constant" on mutable local variable

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

SIL

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

Status: Open.

#83206 In swiftlang/swift;

· rnapier opened on Jul 21, 2025

Abort: function reportError at S:\SourceCache\swift-project\swift\lib\SIL\Verifier\MemoryLifetimeVerifier.cpp:265

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

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

SIL

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

triage neededThis issue needs more specific labelsThis issue needs more specific labels

Status: Open.

#82534 In swiftlang/swift;

· compnerd opened on Jun 26, 2025

@_specialize crashes on partial specialization of typed throws to Never

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

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

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

Status: Open.

#82377 In swiftlang/swift;

· thunderseethe opened on Jun 20, 2025

[C++ interop] Deserialization failure — template class not found

c++ interopFeature: Interoperability with C++Feature: Interoperability with C++

c++ to swiftFeature → c++ interop: c++ to swiftFeature → c++ interop: c++ to swift

compilerThe Swift compiler itselfThe Swift compiler itself

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

multiple modulesFlag: An issue whose reproduction requires multiple modulesFlag: An issue whose reproduction requires multiple modules

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

swift 6.2

Status: Open.

Bug

#82258 In swiftlang/swift;

· AnthonyLatsis opened on Jun 16, 2025

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

An Error "Command SwiftCompile failed with a nonzero exit code" Occurs in Xcode 16.1 and Later

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

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

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

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

Status: Open.

#77942 In swiftlang/swift;

· pa-tsuyoshi-tonobe opened on Dec 4, 2024

ClosureLifetimeFixup inhibits optimizations

closuresFeature: closuresFeature: closures

run-time performance

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

Status: Open.

#77651 In swiftlang/swift;

· asl opened on Nov 15, 2024

The package doesn't compile using the Swift 6.0 open source toolchain

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

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

serializationArea → compiler: Serialization & deserializationArea → compiler: Serialization & deserialization

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

Status: Open.

#76534 In swiftlang/swift;

· gfusee opened on Sep 17, 2024

Project-wide "Pattern that the region based isolation checker does not understand how to check"

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

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

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

Status: Open.

#76005 In swiftlang/swift;

· bauer-andreas opened on Aug 21, 2024

Assertion failed: (isa<To>(Val) && "cast<Ty>() argument of incompatible type!")

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

crashBug: A crash, i.e., an abnormal termination of softwareBug: A crash, i.e., an abnormal termination of software

CSEArea → compiler → SILOptimizer: Common Subexpression EliminationArea → compiler → SILOptimizer: Common Subexpression Elimination

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

Status: Open.

#75774 In swiftlang/swift;

· JaapWijnen opened on Aug 8, 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