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rustc_target, rustc_codegen_llvm: use () for the metadata of pointers to extern { type }s.

A-codegenArea: Code generationArea: Code generation

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

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

E-mentorCall for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.

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.

#52382 In rust-lang/rust;

· eddyb opened on Jul 14, 2018

Padding to ensure a value is well-aligned is not used for niche value optimization

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

A-mir-optArea: MIR optimizationsArea: MIR optimizations

Status: Open.

#79531 In rust-lang/rust;

· jhpratt opened on Nov 29, 2020

Idea: guaranteed-zero padding for niches

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

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

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.

#70230 In rust-lang/rust;

· RalfJung opened on Mar 21, 2020

Layout for enums does not match MIR (and types) very well

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

A-MIRArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html

C-cleanupCategory: PRs that clean code up or issues documenting cleanup.Category: PRs that clean code up or issues documenting cleanup.

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.

#70399 In rust-lang/rust;

· RalfJung opened on Mar 25, 2020

Aligned-in-packed restriction can be circumvented with generic parameters

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

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

A-repr-packedArea: the naughtiest reprArea: the naughtiest repr

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

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-langRelevant to the language teamRelevant to the language team

Status: Open.

#80926 In rust-lang/rust;

· mahkoh opened on Jan 11, 2021

No warning for violating AAPCS64

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

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

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

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

Status: Open.

#89003 In rust-lang/rust;

· workingjubilee opened on Sep 16, 2021

Transmute special-case doesn't take into consideration alignment or enum repr.

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

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

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.

#88290 In rust-lang/rust;

· eddyb opened on Aug 24, 2021

Clarify std::mem-docs wrt host/target

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

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

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.

#81206 In rust-lang/rust;

· lukaslueg opened on Jan 20, 2021

<code>Result&lt;u32, u32&gt;</code> uses less efficient ABI than <code>Result&lt;i32, u32&gt;</code>

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

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

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.

#100698 In rust-lang/rust;

· Kobzol opened on Aug 17, 2022

#[repr(align(N))] fields not allowed in #[repr(packed(M&gt;=N))] structs

A-alignArea: alignment control (`repr(align(N))` and so on)Area: alignment control (`repr(align(N))` and so on)

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

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

A-repr-packedArea: the naughtiest reprArea: the naughtiest repr

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

O-windows-msvcToolchain: MSVC, Operating system: WindowsToolchain: MSVC, Operating system: Windows

Status: Open.

#100743 In rust-lang/rust;

· asahilina opened on Aug 19, 2022

Missed enum layout optimization with a NonZeroU64 + more space in an enum

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

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.

#101567 In rust-lang/rust;

· RalfJung opened on Sep 8, 2022

Niche optimisation with disjoint tags

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

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

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.

#102997 In rust-lang/rust;

· robertbastian opened on Oct 13, 2022