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Issues list

Missed optimization: bounds checking if index is both subtracted and divided 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.
#134704 opened Dec 23, 2024 by SuperSamus
Bad codegen for integer slice in 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.
#134674 opened Dec 23, 2024 by CrazyboyQCD
Missed optimization: states guarenteed after first iteration of loop C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such F-let_chains `#![feature(let_chains)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#134667 opened Dec 22, 2024 by SuperSamus
Missed optimization: bounds check not elided for i * s < n when 0 <= i < n / s 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.
#134636 opened Dec 22, 2024 by SuperSamus
1
Slice bounds check not elided in trivial case when using a local varaible outside of a branch 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-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.
#134466 opened Dec 18, 2024 by ChrisDenton
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
Missed optimizations: Err returns should be out of line, loop not recognized as iterating at least once 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.
#133645 opened Nov 29, 2024 by zackw
1
Missed optimization in sum of remainders 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.
#133621 opened Nov 29, 2024 by notoria
1
Missed optimization when looping over bytes of a value 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 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.
#133528 opened Nov 27, 2024 by theemathas
3
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
Counter in slice iter fails to eliminate bounds check 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.
#132557 opened Nov 3, 2024 by clubby789
1
Suboptimal codegen for integer slice matching without | in inner elements 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.
#132254 opened Oct 28, 2024 by CrazyboyQCD
Rust doesn't use niche in reference (or pointer) to slice A-layout Area: Memory layout of types C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such E-needs-design This issue needs exploration and design to see how and if we can fix/implement it T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132235 opened Oct 27, 2024 by VorfeedCanal
14
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
llvm noalias data gets lost when passing large structs A-ABI Area: Concerning the application binary interface (ABI) 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.
#131905 opened Oct 18, 2024 by sarah-quinones
5
Unnecessary loop unrolling to handle tail when tail length has a smaller known size 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.
#130795 opened Sep 24, 2024 by okaneco
Slow code generated for _mm256_mulhi_epi16 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 P-medium Medium priority regression-untriaged Untriaged performance or correctness regression.
#130782 opened Sep 24, 2024 by turalcar
3
Range<usize>::next should fully MIR-inline A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html A-mir-opt-inlining Area: MIR inlining 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.
#130590 opened Sep 20, 2024 by scottmcm
1
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
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
Using GetFileInformationByName in Windows for file stat/metadata operations A-filesystem Area: `std::fs` 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-windows Operating system: Windows T-libs Relevant to the library team, which will review and decide on the PR/issue.
#130169 opened Sep 9, 2024 by juliusl
Suboptimal Assembly Output from a Modulo on a Power of Two 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 T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#129795 opened Aug 30, 2024 by Altanis
7
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
Missed optimization in if with constant 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 I-slow Issue: Problems and improvements with respect to performance of generated code.
#129144 opened Aug 16, 2024 by tbillington
4
ProTip! Exclude everything labeled bug with -label:bug.