Tracking Issue for asm_cfg: #[cfg(...)] within asm!
#140364
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A-inline-assembly
Area: Inline assembly (`asm!(…)`)
C-tracking-issue
Category: An issue tracking the progress of sth. like the implementation of an RFC
F-asm
`#![feature(asm)]` (not `llvm_asm`)
T-lang
Relevant to the language team
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May 28, 2025
add `asm_cfg`: `#[cfg(...)]` within `asm!` tracking issue: rust-lang#140364 blocked on: rust-lang#140490 This feature was discussed in rust-lang#140279. It allows configuring templates and operands in the assembly macros, for example: ```rust asm!( // or global_asm! or naked_asm! "nop", #[cfg(target_feature = "sse2")] "nop", // ... #[cfg(target_feature = "sse2")] a = const 123, // only used on sse2 ); ``` r? `@tgross35` cc `@traviscross` `@Amanieu` Now builds on rust-lang#140490, which should be merged first.
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May 28, 2025
Rollup merge of #140367 - folkertdev:asm-cfg, r=nnethercote add `asm_cfg`: `#[cfg(...)]` within `asm!` tracking issue: #140364 blocked on: #140490 This feature was discussed in #140279. It allows configuring templates and operands in the assembly macros, for example: ```rust asm!( // or global_asm! or naked_asm! "nop", #[cfg(target_feature = "sse2")] "nop", // ... #[cfg(target_feature = "sse2")] a = const 123, // only used on sse2 ); ``` r? `@tgross35` cc `@traviscross` `@Amanieu` Now builds on #140490, which should be merged first.
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May 28, 2025
add `asm_cfg`: `#[cfg(...)]` within `asm!` tracking issue: rust-lang/rust#140364 blocked on: rust-lang/rust#140490 This feature was discussed in rust-lang/rust#140279. It allows configuring templates and operands in the assembly macros, for example: ```rust asm!( // or global_asm! or naked_asm! "nop", #[cfg(target_feature = "sse2")] "nop", // ... #[cfg(target_feature = "sse2")] a = const 123, // only used on sse2 ); ``` r? `@tgross35` cc `@traviscross` `@Amanieu` Now builds on rust-lang/rust#140490, which should be merged first.
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The feature gate for the issue is
#![feature(asm_cfg)].This feature was discussed in #140279. It allows configuring templates and operands in the assembly macros, for example:
About tracking issues
Tracking issues are used to record the overall progress of implementation.
They are also used as hubs connecting to other relevant issues, e.g., bugs or open design questions.
A tracking issue is however not meant for large scale discussion, questions, or bug reports about a feature.
Instead, open a dedicated issue for the specific matter and add the relevant feature gate label.
Discussion comments will get marked as off-topic or deleted.
Repeated discussions on the tracking issue may lead to the tracking issue getting locked.
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Implementation history
@rustbot label +T-lang +F-asm +A-inline-assembly
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