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stdin and stdout performance considerations are not documented

A-docsArea: Documentation for any part of the project, including the compiler, standard library, and toolsArea: Documentation for any part of the project, including the compiler, standard library, and tools

A-ioArea: `std::io`, `std::fs`, `std::net` and `std::path`Area: `std::io`, `std::fs`, `std::net` and `std::path`

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#106133 In rust-lang/rust;

· Shnatsel opened on Dec 25, 2022

· Updated on Jan 18, 2025

Initializing structs with Option fields set to None produces non-optimal assembly

A-codegenArea: Code generationArea: Code generation

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

Status: Open.

#104290 In rust-lang/rust;

· dotdash opened on Nov 11, 2022

· Updated on Jan 11, 2025

Performance regression on toy problem, but not for opt-level=1.

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

P-lowLow priorityLow priority

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

regression-untriagedUntriaged performance or correctness regression.Untriaged performance or correctness regression.

Status: Open.

#135241 In rust-lang/rust;

· TheThirdOne opened on Jan 8, 2025

· Updated on Jan 8, 2025

Optimize away bounds check in loop indexing into slice, given an assertion

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#71997 In rust-lang/rust;

· joshtriplett opened on May 7, 2020

· Updated on Jan 7, 2025

The recursion limit for monomorphizations are different than for macro expansions

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

Status: Open.

#51951 In rust-lang/rust;

· Marwes opened on Jun 30, 2018

· Updated on Jan 6, 2025

black_box(&x) prevents emitting a constant return value, but it shouldn't

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

A-codegenArea: Code generationArea: Code generation

C-bugCategory: This is a bug.Category: This is a bug.

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#91010 In rust-lang/rust;

· fee1-dead opened on Nov 18, 2021

· Updated on Jan 4, 2025

Array Repeat operator should not use a loop for small sizes

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

A-arrayArea: `[T; N]`Area: `[T; N]`

C-bugCategory: This is a bug.Category: This is a bug.

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#97804 In rust-lang/rust;

· programmerjake opened on Jun 6, 2022

· Updated on Jan 4, 2025

Slice bounds check not elided in trivial case when using a local varaible outside of a branch

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

llvm-fixed-upstreamIssue expected to be fixed by the next major LLVM upgrade, or backported fixesIssue expected to be fixed by the next major LLVM upgrade, or backported fixes

Status: Open.

#134466 In rust-lang/rust;

· ChrisDenton opened on Dec 18, 2024

· Updated on Jan 3, 2025

Unnecessary assembly generated on match statement of u64::trailing_zeros() result

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

A-codegenArea: Code generationArea: Code generation

C-bugCategory: This is a bug.Category: This is a bug.

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#106658 In rust-lang/rust;

· pozix604 opened on Jan 10, 2023

· Updated on Jan 3, 2025

Function operating on arrays performs a lot worse for arrays of length 2

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

A-arrayArea: `[T; N]`Area: `[T; N]`

A-codegenArea: Code generationArea: Code generation

C-bugCategory: This is a bug.Category: This is a bug.

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#102274 In rust-lang/rust;

· Canleskis opened on Sep 25, 2022

· Updated on Jan 3, 2025

Optimization regression in 1.32+

A-codegenArea: Code generationArea: Code generation

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

P-mediumMedium priorityMedium priority

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

Status: Open.

#59352 In rust-lang/rust;

· adrian17 opened on Mar 21, 2019

· Updated on Jan 3, 2025

Bug: Very inefficient code generated for async functions setup (and likely for generators in general)

A-mir-optArea: MIR optimizationsArea: MIR optimizations

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

Status: Open.

#99504 In rust-lang/rust;

· schreter opened on Jul 20, 2022

· Updated on Jan 3, 2025