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Issues list

Stop emitting one-at-a-time byte ops when swapping byte arrays A-codegen Area: Code generation T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#134946 opened Dec 31, 2024 by scottmcm
1
@scottmcm
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
#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. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132677 opened Nov 6, 2024 by zamazan4ik
4
Inefficient implementation of PartialEq for nested (fieldless) enums A-codegen Area: Code generation A-enum 🤓 akshually it's an "ADT" or "algebraic data type" 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. 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
9
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
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
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
Volatile reads and writes on aarch64 sometimes generate instructions not suitable for MMIO in protected VMs 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-AArch64 Armv8-A or later processors in AArch64 mode S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#131894 opened Oct 18, 2024 by qwandor
10
get_unchecked() is never inlined on armv7-unknown-linux-gnueabihf in functions with #[target_feature(enable = "neon")] A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-SIMD Area: SIMD (Single Instruction Multiple Data) 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. 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.
#131745 opened Oct 15, 2024 by hkratz
1
precondition_check functions can survive MonoReachable A-codegen Area: Code generation C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#131578 opened Oct 12, 2024 by saethlin
@saethlin
Regression: tests/codegen/issues/issue-101082.rs fails with -Ctarget-cpu=x86-64-v3 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. P-medium Medium priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another.
#131563 opened Oct 11, 2024 by cuviper
9
-plugin-opt linker flags require a leading dash when using GCC as a linker A-codegen Area: Code generation A-gcc Things relevant to the [future] GCC backend T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#130583 opened Sep 19, 2024 by antoyo
2
Suboptimal codegen for a function that should fold to a constant 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.
#130421 opened Sep 16, 2024 by dcci
@deniskilseev
3
[BUG] llvm-cov warning mismatched data when double slash comment above use A-code-coverage Area: Source-based code coverage (-Cinstrument-coverage) A-codegen Area: Code generation C-bug Category: This is a bug. requires-nightly This issue requires a nightly compiler in some way. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#130065 opened Sep 7, 2024 by loynoir
10
-Csoft-float flag is unsound A-ABI Area: Concerning the application binary interface (ABI) A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness O-Arm Target: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 state P-medium Medium priority T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#129893 opened Sep 2, 2024 by RalfJung
21
#[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. AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. C-bug Category: This is a bug. disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. finished-final-comment-period The final comment period is finished for this PR / Issue. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-lang Relevant to the language team, which will review and decide on the PR/issue.
#129347 opened Aug 21, 2024 by michaelwoerister
15
Weird AVX 512 code generated with std::simd when using -Zbuild-std A-codegen Area: Code generation A-SIMD Area: SIMD (Single Instruction Multiple Data) C-bug Category: This is a bug. PG-portable-simd Project group: Portable SIMD (https://github.com/rust-lang/project-portable-simd) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#129293 opened Aug 20, 2024 by cvijdea-bd
1
Unnecessary alloca Without Optimization Flags A-codegen Area: Code generation C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#129282 opened Aug 19, 2024 by CJacob314
4
Inefficient Match Statement Optimization for Unit-Only Enums with Fixed Offsets A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-patterns Relating to patterns and pattern matching 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. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#129131 opened Aug 15, 2024 by Shadowcat650
3
Missing optimization for interger modulo operation in loop edge case 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.
#128921 opened Aug 10, 2024 by CrazyboyQCD
6
-Cstack-alignment/-Cpreferred-stack-boundary support in rustc A-CLI Area: Command-line interface (CLI) to the compiler A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-rust-for-linux Relevant for the Rust-for-Linux project 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.
#128833 opened Aug 8, 2024 by ojeda
1
-Calign-loops=1 support in rustc A-CLI Area: Command-line interface (CLI) to the compiler A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-rust-for-linux Relevant for the Rust-for-Linux project 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.
#128832 opened Aug 8, 2024 by ojeda
5
-Calign-jumps=1 support in rustc A-CLI Area: Command-line interface (CLI) to the compiler A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-rust-for-linux Relevant for the Rust-for-Linux project 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.
#128831 opened Aug 8, 2024 by ojeda
11
Deduplicate test suites for alternative codegen backends A-codegen Area: Code generation A-contributor-roadblock Area: Makes things more difficult for new contributors to rust itself A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-testsuite Area: The testsuite used to check the correctness of rustc C-discussion Category: Discussion or questions that doesn't represent real issues. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#128741 opened Aug 6, 2024 by RalfJung
17
ProTip! What’s not been updated in a month: updated:<2024-12-04.