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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
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
Figure out how to make symbolisation code smaller A-backtrace Area: Backtraces C-discussion Category: Discussion or questions that doesn't represent real issues. I-heavy Issue: Problems and improvements with respect to binary size of generated code. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#139209 opened Apr 1, 2025 by joboet
7
Derive PartialOrd via Ord when deriving both on a concrete type 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.
#137459 opened Feb 23, 2025 by scottmcm
1
type level debuginfo is duplicated across codegen units A-debuginfo Area: Debugging information in compiled programs (DWARF, PDB, etc.) C-bug Category: This is a bug. 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.
#136059 opened Jan 25, 2025 by jyn514
5
Code size regression iterating an array (opt-level=z) after 1.82.0 A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. I-heavy Issue: Problems and improvements with respect to binary size of generated code. P-low Low priority regression-untriaged Untriaged performance or correctness regression. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132890 opened Nov 11, 2024 by dcci
1
Code size regression (opt-level=z) after 1.73.0 (~40%) C-bug Category: This is a bug. I-heavy Issue: Problems and improvements with respect to binary size of generated code. P-low Low priority regression-untriaged Untriaged performance or correctness regression. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132887 opened Nov 11, 2024 by dcci
1
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 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
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
Possibly sub-optimal optimization of few bytes copy 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.
#130304 opened Sep 13, 2024 by leonardo-m
Large amounts of repeated data in debug info A-debuginfo Area: Debugging information in compiled programs (DWARF, PDB, etc.) A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC 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.
#129722 opened Aug 29, 2024 by khuey
5
Performance regression with get_many_mut() 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. P-medium Medium priority perf-regression Performance regression. regression-from-stable-to-stable Performance or correctness regression from one stable version to another.
#128214 opened Jul 25, 2024 by ChayimFriedman2 1.81.0
2
slice.iter().take_while(f).count() produces suboptimal assembly code 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. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#128208 opened Jul 25, 2024 by bluebear94
1
The slice::chunks_exact iterator does not optimize when the initial slice is non-empty 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.
#128077 opened Jul 22, 2024 by shepmaster
Generated assembly contains a jump to the next instruction A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. I-heavy Issue: Problems and improvements with respect to binary size of generated code.
#127640 opened Jul 12, 2024 by ChaiTRex
3
Three-way match compare mapping to immediates are lowered to a memory table load, not conditional moves, in size-optimized x86-64 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-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.
#127384 opened Jul 5, 2024 by dead-claudia
3
Return branches not correctly merged in size-optimized x86-64 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-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.
#127376 opened Jul 5, 2024 by dead-claudia
1
Strange jmp 0 emitted in size-optimized x86-64 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-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.
#127375 opened Jul 5, 2024 by dead-claudia
@dianqk
3
Chains of checked_add could get better codegen 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. 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. 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.
#127250 opened Jul 2, 2024 by krtab
Binary size creep on Fuchsia after commit 5ced3da 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-heavy Issue: Problems and improvements with respect to binary size of generated code. O-fuchsia Operating system: Fuchsia T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#127039 opened Jun 27, 2024 by amanda-tait
6
Inefficient codegen collecting slice iterator into array 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-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.
#126000 opened Jun 4, 2024 by orlp
3
Tracking Issue for optimize_for_size standard library feature C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC I-heavy Issue: Problems and improvements with respect to binary size of generated code. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#125612 opened May 27, 2024 by Kobzol
5 tasks done
14
Performance regression: rustc failed to optimize specific x86-64 SIMD intrinsics after 1.75.0 A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-SIMD Area: SIMD (Single Instruction Multiple Data) C-bug Category: This is a bug. 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. P-medium Medium priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#124216 opened Apr 21, 2024 by Nugine
16
Missed Optimization when Matching on Complete Unicode Character Ranges with an Unreachable Arm A-codegen Area: Code generation 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. 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.
#123927 opened Apr 14, 2024 by JordanLloydHall
1
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