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Issues: rust-lang/rust

Draft release notes for 1.88.0
#141598 opened May 26, 2025 by Mark-Simulacrum
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Issues list

rustc_session: be more precise about -Z plt=yes on x86-64? A-codegen Area: Code generation A-linkage Area: linking into static, shared libraries and binaries 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. O-x86_64 Target: x86-64 processors (like x86_64-*) (also known as amd64 and x64) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#141720 opened May 29, 2025 by iximeow
4
Missed optimization: matches! results in worse codgen than a logical or 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.
#141497 opened May 24, 2025 by ohadravid
3
Performance issues: Two examples of Rust programs significantly slower than their C++ versions 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.
#141476 opened May 23, 2025 by hjyamauchi
2
Performance problem in for loops with step_by(run-time-variable) A-iterators Area: Iterators C-bug Category: This is a bug. 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.
#141360 opened May 21, 2025 by leonardo-m
2
Slow and memory-intensive compilation with debug symbols 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. needs-triage This issue may need triage. Remove it if it has been sufficiently triaged.
#141297 opened May 20, 2025 by speshuric
6
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
#[derive(PartialEq)] does not reorder field comparisons to improve performance A-macros Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..) 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.
#141141 opened May 17, 2025 by Sol-Ell
1
4
removing needless .collect() in the middle of iterator chain reduces performance significantly 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. S-needs-repro Status: This issue has no reproduction and needs a reproduction to make progress. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140873 opened May 9, 2025 by cyrgani
1
copied().min() performance regression on nightly C-bug Category: This is a bug. I-slow Issue: Problems and improvements with respect to performance of generated code. P-high High priority regression-from-stable-to-nightly Performance or correctness regression from stable to nightly. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#140207 opened Apr 23, 2025 by DaniPopes
6
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
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 WindFrank
2
[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 WindFrank
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
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 WindFrank
@dianqk
6
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
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
pclmulqdq intrinsics don't inline well across target_feature changes anymore A-target-feature Area: Enabling/disabling target features like AVX, Neon, etc. C-bug Category: This is a bug. I-prioritize Issue: Indicates that prioritization has been requested for this issue. I-slow Issue: Problems and improvements with respect to performance of generated code. O-x86_64 Target: x86-64 processors (like x86_64-*) (also known as amd64 and x64) regression-from-stable-to-nightly Performance or correctness regression from stable to nightly. S-has-bisection Status: A bisection has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139029 opened Mar 27, 2025 by iximeow
1
12
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
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. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes
#138497 opened Mar 14, 2025 by leonardo-m
6
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
Suboptimal codegen for match from enum to almost-same-value usize (unnecessary table lookups) 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.
#136972 opened Feb 13, 2025 by oxalica
2
rustdoc regression: intra-doc link links to wrong item A-intra-doc-links Area: Intra-doc links, the ability to link to items in docs by name C-bug Category: This is a bug. I-slow Issue: Problems and improvements with respect to performance of generated code. regression-from-stable-to-stable Performance or correctness regression from one stable version to another. S-has-bisection Status: A bisection has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue.
#136777 opened Feb 9, 2025 by tchebb
@Shunpoco
7
ICE: Invalid operation on bool: MulWithOverflow C-bug Category: This is a bug. F-generic_const_exprs `#![feature(generic_const_exprs)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ I-slow Issue: Problems and improvements with respect to performance of generated code. S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#136766 opened Feb 9, 2025 by matthiaskrgr
@chenyukang
8
ProTip! What’s not been updated in a month: updated:<2025-04-30.