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Issues list

Tracking issue for the define_in_every_cgu_used feature A-attributes Area: Attributes (`#[…]`, `#![…]`) A-codegen Area: Code generation A-linkage Area: linking into static, shared libraries and binaries C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#141339 opened May 21, 2025 by jbatez
5 tasks
5
Warn user when the whole function is optimized to a ud2 A-codegen Area: Code generation A-lints Area: Lints (warnings about flaws in source code) such as unused_mut. C-feature-request Category: A feature request, i.e: not implemented / a PR. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#141220 opened May 18, 2025 by HKalbasi
7
Inlining leaves extra assembly A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#141144 opened May 17, 2025 by RoDmitry
5
Change codegen of LLVM intrinsics to be name-based, and add llvm linkage support for x86amx A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140763 opened May 7, 2025 by sayantn • Draft
@nikic
30
Bad codegen for comparing struct of two 16bit ints A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. I-slow Issue: Problems and improvements with respect to performance of generated code.
#140167 opened Apr 22, 2025 by bjorn3
33
armv4t-none-eabi cannot use compiler_fence A-atomic Area: Atomics, barriers, and sync primitives A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. O-Arm Target: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 state T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140105 opened Apr 21, 2025 by EvansJahja
3
rustc_codegen_ssa should write temporary files to the output directory A-codegen Area: Code generation C-enhancement Category: An issue proposing an enhancement or a PR with one. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139963 opened Apr 17, 2025 by ChrisDenton
1
Optimization regression: array argument somehow produces null check? A-ABI Area: Concerning the application binary interface (ABI) A-codegen Area: Code generation C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139415 opened Apr 5, 2025 by alex
5
Intrinsics wrappers not being inlined A-codegen Area: Code generation A-intrinsics Area: Intrinsics A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-target-feature Area: Enabling/disabling target features like AVX, Neon, etc. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139160 opened Mar 31, 2025 by mxple
4
f32 += f32 * u32 is faster in a loop than f32 += f32; can be defeated (a little bit) with #[cold] annotation? A-codegen Area: Code generation C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138953 opened Mar 25, 2025 by nabijaczleweli
3
Allow emitting more enums as SSA values A-codegen Area: Code generation C-enhancement Category: An issue proposing an enhancement or a PR with one. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138373 opened Mar 11, 2025 by scottmcm
1
LLVM nocapture attribute is used incorrectly A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-opsem Relevant to the opsem team
#137668 opened Feb 26, 2025 by tmiasko
1
10
Emit dereferenceable assumptions for slices A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#137568 opened Feb 24, 2025 by Kmeakin
1
Inefficient code generation with target-feature AVX2 A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-target-feature Area: Enabling/disabling target features like AVX, Neon, etc. C-bug Category: This is a bug. I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#137335 opened Feb 20, 2025 by LaurenzV
5
Missed optimization: big immutable locals are not promoted to constants A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#136218 opened Jan 28, 2025 by WaffleLapkin
1
Missed match optimization of riscv A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#136216 opened Jan 28, 2025 by WaffleLapkin
#[thread_local]s are pessimized in #[no_mangle] functions A-codegen Area: Code generation A-thread-locals Area: Thread local storage (TLS) C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such F-thread_local `#![feature(thread_local)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#136042 opened Jan 25, 2025 by purplesyringa
1
atomic RMW intrinsics: avoid unnecessary ptr/int conversions A-atomic Area: Atomics, barriers, and sync primitives A-codegen Area: Code generation A-intrinsics Area: Intrinsics A-strict-provenance Area: Strict provenance for raw pointers C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such
#134617 opened Dec 21, 2024 by RalfJung
enums with disjoint ranges should emit more precise llvm.range metadata A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#133822 opened Dec 3, 2024 by Kmeakin
1
2
Rustc fails to compile a program with ThinLTO and split-debuginfo = "packed" A-codegen Area: Code generation A-debuginfo Area: Debugging information in compiled programs (DWARF, PDB, etc.) A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132677 opened Nov 6, 2024 by zamazan4ik
7
Inefficient implementation of PartialEq for nested (fieldless) enums A-codegen Area: Code generation A-enum Area: Enums (discriminated unions, or more generally ADTs (algebraic data types)) A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. I-heavy Issue: Problems and improvements with respect to binary size of generated code. I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132628 opened Nov 5, 2024 by zaneduffield
@dianqk
12
Tracking issue for release notes of #129347: #[inline(never)] does not work for async functions A-async-await Area: Async & Await A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. relnotes Marks issues that should be documented in the release notes of the next release. relnotes-tracking-issue Marks issues tracking what text to put in release notes. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#132573 opened Nov 3, 2024 by rustbot
3 tasks
assembler label '' cannot be undefined on Windows ARM A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-miscompile Issue: Correct Rust code lowers to incorrect machine code O-AArch64 Armv8-A or later processors in AArch64 mode O-windows Operating system: Windows T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132287 opened Oct 28, 2024 by NicholasLYang
3
Unmerged stack slots under Windows A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-heavy Issue: Problems and improvements with respect to binary size of generated code. O-windows-msvc Toolchain: MSVC, Operating system: Windows T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132014 opened Oct 21, 2024 by xTachyon
1
5
Codegen depends on let-variable ordering for unclear reasons A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-panic Area: Panicking machinery C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-heavy Issue: Problems and improvements with respect to binary size of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#131987 opened Oct 21, 2024 by CrazyboyQCD
3
ProTip! What’s not been updated in a month: updated:<2025-04-25.