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Issues: rust-lang/rust

Draft release notes for 1.87
#140133 opened Apr 21, 2025 by BoxyUwU
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Issues list

Redundant Copies with #[repr(align)] Enum References A-repr Area: the `#[repr(stuff)]` attribute 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.
#140182 opened Apr 23, 2025 by ZhonghaoPan-nju
Not optimize boolean computations for the usize 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-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.
#140103 opened Apr 21, 2025 by ZhonghaoPan-nju
7
Fails to optimize away trivial ownership move of Vec in high optimization levels C-bug Category: This is a bug. 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.
#140057 opened Apr 20, 2025 by ZhonghaoPan-nju
1
Creating an array can be made 2x faster 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 T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139875 opened Apr 15, 2025 by abgros
2
Simpler Logic Produces More Complex Output Than Equivalent Expression 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.
#139851 opened Apr 15, 2025 by ZhonghaoPan-nju
1
[Optimization] Significantly different assembly output for logically equivalent match patterns with string comparisons 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. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139784 opened Apr 14, 2025 by ZhonghaoPan-nju
4
Bounds check not elided for index that should be known to be in-bounds 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. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes
#139759 opened Apr 13, 2025 by okaneco
2
[mir-opt] SRoA away the tuple in match (a, b) A-mir-opt Area: MIR optimizations 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.
#139739 opened Apr 13, 2025 by scottmcm
assert_eq! of trivially-equal enums with 2 non-empty variants is not optimized out 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.
#139733 opened Apr 13, 2025 by ZhonghaoPan-nju
@dianqk
6
A case of compound x86_64 performance regression caused by LLVM 20 and #124810 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 P-high High priority regression-untriaged Untriaged performance or correctness regression. 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.
#139730 opened Apr 13, 2025 by MoSal
3
matching on ordered enum variants emits too many branches 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 T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139702 opened Apr 12, 2025 by Rudxain
is_char_boundary not elided when impl pop in terms of truncate 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.
#139655 opened Apr 11, 2025 by Rudxain
Ensure we can optimize out does-nothing drops like array::IntoIter<NotNeedsDrop, N> A-mir-opt Area: MIR optimizations 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.
#139422 opened Apr 5, 2025 by scottmcm
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
Creating a nested MaybeUninit array unnecessarily calls memset 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.
#139355 opened Apr 4, 2025 by abgros
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
Enum layout should allow multiple untagged variants if they have nonoverlapping values A-layout Area: Memory layout of types 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.
#139148 opened Mar 30, 2025 by lolbinarycat
Promoted constants lead to poor MIR from comparisons A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html A-mir-opt Area: MIR optimizations 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. WG-mir-opt Working group: MIR optimizations
#139093 opened Mar 29, 2025 by scottmcm
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
Optimize const pattern guards for StructuralEq types A-patterns Relating to patterns and pattern matching 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.
#138664 opened Mar 18, 2025 by TimNN
Simple Option use, like in checked_sub, should optimize out fully in MIR A-mir-opt Area: MIR optimizations 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.
#138544 opened Mar 15, 2025 by scottmcm
3
Removing trailing zeros of a NonZero 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.
#138497 opened Mar 14, 2025 by leonardo-m
6
Should Option<u128> use a smaller (maybe usize) tag? A-layout Area: Memory layout of types C-discussion Category: Discussion or questions that doesn't represent real issues. 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.
#138332 opened Mar 11, 2025 by scottmcm
4
missed optimimization: needless clone of stdlib non-copy type is not eliminated 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. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#138118 opened Mar 6, 2025 by lolbinarycat
2
Missed optimization: unnecessary copies returning 3-tuple of u32 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.
#137488 opened Feb 23, 2025 by zackw
1
ProTip! Find all open issues with in progress development work with linked:pr.