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Partially stabilize LoongArch target features #135015

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@heiher heiher commented Jan 2, 2025 •
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Stabilization PR for the LoongArch target features. This PR stabilizes some of the target features tracked by #44839.

Specifically, this PR stabilizes the following target features:

  • f
  • d
  • frecipe
  • lasx
  • lbt
  • lsx
  • lvz

Docs PR: rust-lang/reference#1707

r? @Amanieu

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Jan 2, 2025
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rustbot commented Jan 2, 2025

rust-analyzer is developed in its own repository. If possible, consider making this change to rust-lang/rust-analyzer instead.

cc @rust-lang/rust-analyzer

@heiher heiher force-pushed the stabilize-loongarch-target-features branch from cb6584c to 29c94f5 Compare January 2, 2025 07:35
@jieyouxu jieyouxu added the O-loongarch Target: LoongArch (LA32R, LA32S, LA64) label Jan 2, 2025
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RalfJung commented Jan 2, 2025 •
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If "d" and "f" work anything like the RISC-V features of the same name, they should not be stabilized yet. We need to figure out #116344 and #131799 for LoongArch first.

Does any of the other features ever have any effect on calling conventions or ABI?

@jieyouxu jieyouxu added the A-target-feature Area: Enabling/disabling target features like AVX, Neon, etc. label Jan 2, 2025
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heiher commented Jan 2, 2025

If "d" and "f" work anything like the RISC-V features of the same name, they should not be stabilized yet. We need to figure out #116344 and #131799 for LoongArch first.

Does any of the other features ever have any effect on calling conventions or ABI?

Thank you! Other than f and d, there are no other target features affecting the calling convention and ABI.

@heiher heiher changed the title Stabilize LoongArch target features Partially stabilize LoongArch target features Jan 2, 2025
@heiher heiher force-pushed the stabilize-loongarch-target-features branch from 29c94f5 to 4c59f0d Compare January 2, 2025 14:16
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ehuss commented Jan 2, 2025

This will need a PR for documentation at https://github.com/rust-lang/reference/blob/master/src/attributes/codegen.md, and a lang (+whoever?) FCP.

Amanieu
Amanieu reviewed Jan 2, 2025
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compiler/rustc_target/src/target_features.rs Outdated
Comment on lines 773 to 774
("relax", STABLE, &[]),
("ual", STABLE, &[]),
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  • relax refers to linker relaxation support and may not be appropriate to expose as a target feature.
  • ual refers to support for unaligned memory access, similar to strict-align on ARM targets. It's probably fine to stabilize as-is, but we may want to double-check with other targets if we want to have a consistent feature name between all of them (alternatively it's also fine to make the feature target-specific).

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Also to be clear, ual can only affect how unaligned accesses are codegen'd, and nothing else. See this recent discussion on Zulip.

If we have target feature docs somewhere, they should clarify hat unaligned accesses are still UB except when performed via {read,write}_unaligned.

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I agree with skipping these two target features and stabilizing them at a more appropriate time.

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Amanieu commented Jan 2, 2025

r? lang

@rustbot rustbot added the T-lang Relevant to the language team, which will review and decide on the PR/issue. label Jan 2, 2025
@rustbot rustbot assigned joshtriplett and unassigned Amanieu Jan 2, 2025
@heiher heiher mentioned this pull request Jan 3, 2025
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heiher commented Jan 3, 2025

This will need a PR for documentation at https://github.com/rust-lang/reference/blob/master/src/attributes/codegen.md, and a lang (+whoever?) FCP.

PR: rust-lang/reference#1707

@heiher heiher force-pushed the stabilize-loongarch-target-features branch from 4c59f0d to 71e17a0 Compare January 3, 2025 07:10
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bors commented Jan 6, 2025

☔ The latest upstream changes (presumably #134794) made this pull request unmergeable. Please resolve the merge conflicts.

@heiher heiher force-pushed the stabilize-loongarch-target-features branch from 71e17a0 to 49b6947 Compare January 6, 2025 06:56
@traviscross traviscross added the I-lang-nominated Nominated for discussion during a lang team meeting. label Jan 7, 2025
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bors commented Mar 15, 2025

☔ The latest upstream changes (presumably #138523) made this pull request unmergeable. Please resolve the merge conflicts.

@Amanieu Amanieu mentioned this pull request Mar 16, 2025
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@heiher heiher force-pushed the stabilize-loongarch-target-features branch from 49b6947 to f4c604d Compare March 18, 2025 09:48
@heiher heiher requested a review from Amanieu March 18, 2025 11:07
@heiher heiher force-pushed the stabilize-loongarch-target-features branch from f4c604d to 7cbc101 Compare March 19, 2025 07:20
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request May 3, 2025
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Unrolled build for rust-lang#140395
6beec96 
Rollup merge of rust-lang#140395 - RalfJung:target-feature-tests, r=petrochenkov

organize and extend forbidden target feature tests

In particular this adds some loongarch tests for rust-lang#135015, Cc `@heiher`

Seems like the tests change so much git does not detect the renames; a commit-by-commit review should help.

try-job: `x86_64-gnu-llvm-20-*`
@rfcbot rfcbot added finished-final-comment-period The final comment period is finished for this PR / Issue. to-announce Announce this issue on triage meeting and removed final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. labels May 8, 2025
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rfcbot commented May 8, 2025

The final comment period, with a disposition to merge, as per the review above, is now complete.

As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.

This will be merged soon.

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Amanieu commented May 8, 2025

@bors r+

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bors commented May 8, 2025

📌 Commit 1f2536f has been approved by Amanieu

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 8, 2025
jhpratt added a commit to jhpratt/rust that referenced this pull request May 9, 2025
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Rollup merge of rust-lang#135015 - heiher:stabilize-loongarch-target-…
efdcf91 
…features, r=Amanieu

Partially stabilize LoongArch target features

Stabilization PR for the LoongArch target features. This PR stabilizes some of the target features tracked by rust-lang#44839.

Specifically, this PR stabilizes the following target features:

* f
* d
* frecipe
* lasx
* lbt
* lsx
* lvz

Docs PR: rust-lang/reference#1707

r? `@Amanieu`
@jhpratt jhpratt mentioned this pull request May 9, 2025
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jhpratt commented May 9, 2025

@bors r-

#140835 (comment)

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels May 9, 2025
@heiher heiher force-pushed the stabilize-loongarch-target-features branch from 1f2536f to 4a662c2 Compare May 9, 2025 03:26
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heiher commented May 9, 2025

@rustbot ready

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 9, 2025
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tgross35 commented May 9, 2025

@bors r=Amanieu

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bors commented May 9, 2025

📌 Commit 4a662c2 has been approved by Amanieu

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 9, 2025
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bors commented May 9, 2025

⌛ Testing commit 4a662c2 with merge 5437b87...

bors added a commit to rust-lang-ci/rust that referenced this pull request May 9, 2025
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Auto merge of rust-lang#135015 - heiher:stabilize-loongarch-target-fe…
5437b87 
…atures, r=Amanieu

Partially stabilize LoongArch target features

Stabilization PR for the LoongArch target features. This PR stabilizes some of the target features tracked by rust-lang#44839.

Specifically, this PR stabilizes the following target features:

* f
* d
* frecipe
* lasx
* lbt
* lsx
* lvz

Docs PR: rust-lang/reference#1707

r? `@Amanieu`
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@bors retry
Yield priority to the stable release.

Zalathar added a commit to Zalathar/rust that referenced this pull request May 10, 2025
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Rollup merge of rust-lang#135015 - heiher:stabilize-loongarch-target-…
2a20aa0 
…features, r=Amanieu

Partially stabilize LoongArch target features

Stabilization PR for the LoongArch target features. This PR stabilizes some of the target features tracked by rust-lang#44839.

Specifically, this PR stabilizes the following target features:

* f
* d
* frecipe
* lasx
* lbt
* lsx
* lvz

Docs PR: rust-lang/reference#1707

r? `@Amanieu`
@Zalathar Zalathar mentioned this pull request May 10, 2025
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bors added a commit to rust-lang-ci/rust that referenced this pull request May 10, 2025
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Auto merge of rust-lang#140885 - Zalathar:rollup-cg3dewe, r=Zalathar
84cff42 
Rollup of 10 pull requests

Successful merges:

 - rust-lang#129334 (Implement (part of) ACP 429: add `DerefMut` to `Lazy[Cell/Lock]`)
 - rust-lang#135015 (Partially stabilize LoongArch target features)
 - rust-lang#138736 (Sanitizers target modificators)
 - rust-lang#139562 (rustdoc: add a handle that makes sidebar resizing more obvious)
 - rust-lang#140151 (remove intrinsics::drop_in_place)
 - rust-lang#140660 (remove 'unordered' atomic intrinsics)
 - rust-lang#140783 (Update documentation of OnceLock::get_or_init.)
 - rust-lang#140789 (Update hermit-abi to 0.5.1)
 - rust-lang#140792 (Use intrinsics for `{f16,f32,f64,f128}::{minimum,maximum}` operations)
 - rust-lang#140862 (Enable non-leaf Frame Pointers for Arm64EC Windows)

r? `@ghost`
`@rustbot` modify labels: rollup
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