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Figure out how to make symbolisation code smaller

A-backtraceArea: BacktracesArea: Backtraces

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

I-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size 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.

#139209 In rust-lang/rust;

· joboet opened on Apr 1, 2025

Tracking Issue for <code>optimize_for_size</code> standard library feature

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

I-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size 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.

#125612 In rust-lang/rust;

· Kobzol opened on May 27, 2024

Performance regression: rustc failed to optimize specific x86-64 SIMD intrinsics after 1.75.0

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-SIMDArea: SIMD (Single Instruction Multiple Data)Area: SIMD (Single Instruction Multiple Data)

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

I-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size of generated code.

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

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

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.

#124216 In rust-lang/rust;

· Nugine opened on Apr 21, 2024

portable_simd bitmask + select generates poor code on ARM64

A-codegenArea: Code generationArea: Code generation

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-SIMDArea: SIMD (Single Instruction Multiple Data)Area: SIMD (Single Instruction Multiple Data)

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

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

I-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size of generated code.

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

O-AArch64Armv8-A or later processors in AArch64 modeArmv8-A or later processors in AArch64 mode

PG-portable-simdProject group: Portable SIMD (https://github.com/rust-lang/project-portable-simd)Project group: Portable SIMD (https://github.com/rust-lang/project-portable-simd)

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.

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.

#122376 In rust-lang/rust;

· orlp opened on Mar 12, 2024

<code>impl fmt::Display for u32</code> compiles to large binary

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

I-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size 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.

#118940 In rust-lang/rust;

· StackOverflowExcept1on opened on Dec 14, 2023

Vec-growing logic emitted for Vecs which never grow

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

I-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size 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.

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.

#118563 In rust-lang/rust;

· LingMan opened on Dec 3, 2023

<code>Cow&lt;[T]&gt;</code> layout forces unnecessary branching

A-layoutArea: Memory layout of typesArea: Memory layout of types

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-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size of generated code.

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.

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.

#117763 In rust-lang/rust;

· Jules-Bertholet opened on Nov 9, 2023

Tracking issue for improving std::fmt::Arguments and format_args!()

A-fmtArea: `core::fmt`Area: `core::fmt`

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

I-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size of generated code.

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.

#99012 In rust-lang/rust;

· m-ou-se opened on Jul 7, 2022

write! generate longer assembly compared to format!

A-fmtArea: `core::fmt`Area: `core::fmt`

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

I-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size of generated code.

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.

#82508 In rust-lang/rust;

· pickfire opened on Feb 25, 2021

Better codegen for FromIterator Box&lt;[T]&gt;

A-collectionsArea: `std::collections`Area: `std::collections`

A-iteratorsArea: IteratorsArea: Iterators

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

E-help-wantedCall for participation: Help is requested to fix this issue.Call for participation: Help is requested to fix this issue.

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

I-heavyIssue: Problems and improvements with respect to binary size of generated code.Issue: Problems and improvements with respect to binary size 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.

#75636 In rust-lang/rust;

· pickfire opened on Aug 17, 2020