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Extra instructions in <code>as_chunks</code> remainder loop between beta and nightly

A-codegenArea: Code generationArea: Code generation

C-bugCategory: This is a bug.Category: This is a bug.

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

P-mediumMedium priorityMedium priority

regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.Performance or correctness regression from stable to nightly.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#147459 In rust-lang/rust;

· okaneco opened on Oct 8, 2025

v8 (for deno) doesn't compile on stable-x86_64-pc-windows-msvc

A-codegenArea: Code generationArea: Code generation

C-bugCategory: This is a bug.Category: This is a bug.

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

S-needs-reproStatus: This issue has no reproduction and needs a reproduction to make progress.Status: This issue has no reproduction and needs a reproduction to make progress.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#147094 In rust-lang/rust;

· sebbu2 opened on Sep 27, 2025

Run 32-bit codegen tests in PR CI?

A-CIArea: Our Github Actions CIArea: Our Github Actions CI

A-codegenArea: Code generationArea: Code generation

A-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustc

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-infraRelevant to the infrastructure team, which will review and decide on the PR/issue.Relevant to the infrastructure team, which will review and decide on the PR/issue.

Status: Open.

#146881 In rust-lang/rust;

· nikic opened on Sep 22, 2025

Incorrect codegen (instead of error) since 1.87.0, when all but one register is reserved on RISC-V.

A-codegenArea: Code generationArea: Code generation

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

C-bugCategory: This is a bug.Category: This is a bug.

O-riscvTarget: RISC-V architectureTarget: RISC-V architecture

P-mediumMedium priorityMedium priority

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#146393 In rust-lang/rust;

· zachs18 opened on Sep 10, 2025

arm: Using <code>ldrd</code> with <code>static</code> symbol in <code>asm</code> returns "unsupported relocation type".

A-codegenArea: Code generationArea: Code generation

A-inline-assemblyArea: Inline assembly (`asm!(…)`)Area: Inline assembly (`asm!(…)`)

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

C-bugCategory: This is a bug.Category: This is a bug.

O-ArmTarget: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 stateTarget: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 state

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#146061 In rust-lang/rust;

· datdenkikniet opened on Aug 31, 2025

error: cached cgu 0x4a9cmec5w3kmvnwylp7mwkt should have an object file, but doesn't

A-codegenArea: Code generationArea: Code generation

A-threadArea: `std::thread`Area: `std::thread`

C-bugCategory: This is a bug.Category: This is a bug.

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#145800 In rust-lang/rust;

· styris-ame opened on Aug 23, 2025

Tracking Issue for <code>darwin_objc</code>

A-codegenArea: Code generationArea: Code generation

A-linkageArea: linking into static, shared libraries and binariesArea: linking into static, shared libraries and binaries

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-darwin_objc#![feature(darwin_objc)], https://github.com/rust-lang/rust/issues/145496#![feature(darwin_objc)], https://github.com/rust-lang/rust/issues/145496

I-lang-nominatedNominated for discussion during a lang team meeting.Nominated for discussion during a lang team meeting.

O-appleOperating system: Apple (macOS, iOS, tvOS, visionOS, watchOS)Operating system: Apple (macOS, iOS, tvOS, visionOS, watchOS)

P-lang-drag-2Lang team prioritization drag level 2.https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang.Lang team prioritization drag level 2.https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#145496 In rust-lang/rust;

· jbatez opened on Aug 16, 2025

rustc_session: be more precise about -Z plt=yes on x86-64?

A-codegenArea: Code generationArea: Code generation

A-linkageArea: linking into static, shared libraries and binariesArea: linking into static, shared libraries and binaries

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

O-x86_64Target: x86-64 processors (like x86_64-*) (also known as amd64 and x64)Target: x86-64 processors (like x86_64-*) (also known as amd64 and x64)

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#141720 In rust-lang/rust;

· iximeow opened on May 29, 2025

Missed optimization: multiple instances of a small struct don't reuse the stack allocation

A-codegenArea: Code generationArea: Code generation

A-MIRArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#141649 In rust-lang/rust;

· ohadravid opened on May 27, 2025

Warn user when the whole function is optimized to a <code>ud2</code>

A-codegenArea: Code generationArea: Code generation

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

C-feature-requestCategory: A feature request, i.e: not implemented / a PR.Category: A feature request, i.e: not implemented / a PR.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#141220 In rust-lang/rust;

· HKalbasi opened on May 18, 2025

Inlining leaves extra assembly

A-codegenArea: Code generationArea: Code generation

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#141144 In rust-lang/rust;

· RoDmitry opened on May 17, 2025

Bad codegen for comparing struct of two 16bit ints

A-codegenArea: Code generationArea: Code generation

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

C-bugCategory: This is a bug.Category: This is a bug.

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

Status: Open.

#140167 In rust-lang/rust;

· bjorn3 opened on Apr 22, 2025