Stabilize `sse4a` and `tbm` target features #144542

sayantn · 2025-07-27T18:46:27Z

This PR stabilizes the feature flag sse4a_target_feature and tbm_target_feature (tracking issue #44839).

Public API

The 2 x86 target features sse4a and tbm

Also, these were added in LLVM2.6 and LLVM3.4-rc1, respectively, and as the minimum LLVM required for rustc is LLVM19, we are safe in that front too!

As all of the required tasks have been done (adding the target features to rustc, implementing their runtime detection in std_detect and implementing the associated intrinsics in core_arch), these target features can be stabilized now. The intrinsics were stabilized long ago, in 1.27.0

Reference PR:

Add doc for sse4a and tbm reference#1949

cc @rust-lang/lang

@rustbot label I-lang-nominated
r? lang

rustbot · 2025-07-27T18:46:31Z

r? @petrochenkov

rustbot has assigned @petrochenkov.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

rustbot · 2025-07-27T18:46:33Z

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

cc @Amanieu, @folkertdev, @sayantn

traviscross · 2025-07-28T01:09:07Z

Thanks. This needs a PR to the Reference.

cc @tgross35 @RalfJung @Amanieu @workingjubilee @rust-lang/lang-docs

RalfJung · 2025-07-28T06:06:08Z

The usual question for target feature stabilizations:
Are there any ABI concerns? Is there any potential unsoundness or other problems when mixing code built with and without these features?

tmandry · 2025-07-30T15:41:31Z

@rfcbot fcp merge

rfcbot · 2025-07-30T15:41:34Z

Team member @tmandry has proposed to merge this. The next step is review by the rest of the tagged team members:

No concerns currently listed.

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

cc @rust-lang/lang-advisors: FCP proposed for lang, please feel free to register concerns.
See this document for info about what commands tagged team members can give me.

traviscross · 2025-07-30T15:42:03Z

@rfcbot reviewed

rfcbot · 2025-07-30T15:42:12Z

🔔 This is now entering its final comment period, as per the review above. 🔔

Amanieu · 2025-07-30T15:42:52Z

The usual question for target feature stabilizations: Are there any ABI concerns? Is there any potential unsoundness or other problems when mixing code built with and without these features?

No, these just enable a few instructions. They don't expose any additional register or have any impact on ABI.

nikomatsakis · 2025-07-30T15:44:03Z

@rfcbot reviewed

Rollup of 15 pull requests Successful merges: - #131477 (Apple: Always pass SDK root when linking with `cc`, and pass it via `SDKROOT` env var) - #139806 (std: sys: pal: uefi: Overhaul Time) - #144386 (Extract TraitImplHeader in AST/HIR) - #144542 (Stabilize `sse4a` and `tbm` target features) - #144921 (Don't emit `rustdoc::broken_intra_doc_links` for GitHub-flavored Markdown admonitions like `[!NOTE]`) - #145155 (Port `#[allow_internal_unsafe]` to the new attribute system (attempt 2)) - #145214 (fix: re-enable self-assignment) - #145216 (rustdoc: correct negative-to-implicit discriminant display) - #145238 (Tweak invalid builtin attribute output) - #145249 (Rename entered trace span variables from `_span` to `_trace`) - #145251 (Support using #[unstable_feature_bound] on trait) - #145253 (Document compiler and stdlib in stage1 in `pr-check-2` CI job) - #145260 (Make explicit guarantees about `Vec`’s allocator) - #145263 (Update books) - #145273 (Account for new `assert!` desugaring in `!condition` suggestion) r? `@ghost` `@rustbot` modify labels: rollup

tests/ui/target-feature/gate.rs

fmease · 2025-08-12T02:37:08Z

#145282 (comment)
@bors r-

- remove some stabilized target features from `gate.rs`

sayantn · 2025-08-13T20:39:44Z

@rustbot ready

traviscross · 2025-08-14T04:56:59Z

@bors r=Amanieu,traviscross rollup=iffy

bors · 2025-08-14T04:57:01Z

📌 Commit 100d19c has been approved by Amanieu,traviscross

It is now in the queue for this repository.

bors · 2025-08-14T14:01:15Z

⌛ Testing commit 100d19c with merge be00ea1...

bors · 2025-08-14T17:56:34Z

☀️ Test successful - checks-actions
Approved by: Amanieu,traviscross
Pushing be00ea1 to master...

github-actions · 2025-08-14T17:59:42Z

What is this?

This is an experimental post-merge analysis report that shows differences in test outcomes between the merged PR and its parent PR.

Comparing 30017c3 (parent) -> be00ea1 (this PR)

Test differences

Show 2 test diffs

2 doctest diffs were found. These are ignored, as they are noisy.

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard be00ea1968d8d5afb5d93d2dedeb97a8bba300cb --output-dir test-dashboard

And then open test-dashboard/index.html in your browser to see an overview of all executed tests.

Job duration changes

dist-apple-various: 5096.0s -> 6748.0s (32.4%)
aarch64-apple: 6672.8s -> 5038.9s (-24.5%)
dist-aarch64-apple: 7662.7s -> 6257.0s (-18.3%)
dist-ohos-x86_64: 4180.1s -> 4781.2s (14.4%)
dist-aarch64-msvc: 5735.5s -> 6545.1s (14.1%)
dist-powerpc64le-linux-gnu: 5208.4s -> 5676.4s (9.0%)
dist-armv7-linux: 5086.3s -> 5491.9s (8.0%)
dist-various-1: 3911.2s -> 4218.5s (7.9%)
dist-loongarch64-musl: 5024.7s -> 5418.0s (7.8%)
x86_64-gnu-nopt: 7688.5s -> 7148.5s (-7.0%)

How to interpret the job duration changes?

Job durations can vary a lot, based on the actual runner instance
that executed the job, system noise, invalidated caches, etc. The table above is provided
mostly for t-infra members, for simpler debugging of potential CI slow-downs.

rust-timer · 2025-08-14T19:08:40Z

Finished benchmarking commit (be00ea1): comparison URL.

Overall result: ❌✅ regressions and improvements - please read the text below

Our benchmarks found a performance regression caused by this PR.
This might be an actual regression, but it can also be just noise.

Next Steps:

If the regression was expected or you think it can be justified,
please write a comment with sufficient written justification, and add
@rustbot label: +perf-regression-triaged to it, to mark the regression as triaged.
If you think that you know of a way to resolve the regression, try to create
a new PR with a fix for the regression.
If you do not understand the regression or you think that it is just noise,
you can ask the @rust-lang/wg-compiler-performance working group for help (members of this group
were already notified of this PR).

@rustbot label: +perf-regression
cc @rust-lang/wg-compiler-performance

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.6%	[0.3%, 1.7%]	8
Improvements ✅ (primary)	-0.8%	[-0.8%, -0.8%]	1
Improvements ✅ (secondary)	-0.2%	[-0.2%, -0.2%]	2
All ❌✅ (primary)	-0.8%	[-0.8%, -0.8%]	1

Max RSS (memory usage)

This benchmark run did not return any relevant results for this metric.

Cycles

Results (primary 2.3%, secondary 2.6%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	2.3%	[2.3%, 2.3%]	1
Regressions ❌ (secondary)	2.6%	[1.2%, 3.8%]	6
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	2.3%	[2.3%, 2.3%]	1

Binary size

Results (secondary -0.2%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.4%	[0.1%, 1.0%]	3
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.3%	[-0.8%, -0.1%]	9
All ❌✅ (primary)	-	-	0

Bootstrap: 470.205s -> 471.131s (0.20%)
Artifact size: 377.38 MiB -> 377.44 MiB (0.02%)

…eu,traviscross Stabilize `sse4a` and `tbm` target features This PR stabilizes the feature flag `sse4a_target_feature` and `tbm_target_feature` (tracking issue rust-lang#44839). # Public API The 2 `x86` target features `sse4a` and `tbm` Also, these were added in LLVM2.6 and LLVM3.4-rc1, respectively, and as the minimum LLVM required for rustc is LLVM19, we are safe in that front too! As all of the required tasks have been done (adding the target features to rustc, implementing their runtime detection in std_detect and implementing the associated intrinsics in core_arch), these target features can be stabilized now. The intrinsics were stabilized *long* ago, in 1.27.0 Reference PR: - rust-lang/reference#1949 cc `@rust-lang/lang` `@rustbot` label I-lang-nominated r? lang

Mark-Simulacrum · 2025-08-19T02:14:10Z

Perf regressions look like noise, not worth further investigation.

This MR contains the following updates: | Package | Update | Change | |---|---|---| | [rust](https://github.com/rust-lang/rust) | minor | `1.90.0` -> `1.91.0` | MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot). **Proposed changes to behavior should be submitted there as MRs.** --- ### Release Notes <details> <summary>rust-lang/rust (rust)</summary> ### [`v1.91.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1910-2025-10-30) [Compare Source](rust-lang/rust@1.90.0...1.91.0) \========================== <a id="1.91.0-Language"></a> ## Language - [Lower pattern bindings in the order they're written and base drop order on primary bindings' order](rust-lang/rust#143764) - [Stabilize declaration of C-style variadic functions for `sysv64`, `win64`, `efiapi`, and `aapcs` ABIs](rust-lang/rust#144066). This brings these ABIs in line with the C ABI: variadic functions can be declared in extern blocks but not defined. - [Add `dangling_pointers_from_locals` lint to warn against dangling pointers from local variables](rust-lang/rust#144322) - [Upgrade `semicolon_in_expressions_from_macros` from warn to deny](rust-lang/rust#144369) - [Stabilize LoongArch32 inline assembly](rust-lang/rust#144402) - [Add warn-by-default `integer_to_ptr_transmutes` lint against integer-to-pointer transmutes](rust-lang/rust#144531) - [Stabilize `sse4a` and `tbm` target features](rust-lang/rust#144542) - [Add `target_env = "macabi"` and `target_env = "sim"` cfgs](rust-lang/rust#139451) as replacements for the `target_abi` cfgs with the same values. <a id="1.91.0-Compiler"></a> ## Compiler - [Don't warn on never-to-any `as` casts as unreachable](rust-lang/rust#144804) <a id="1.91.0-Platform-Support"></a> ## Platform Support - [Promote `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` to Tier 2 with host tools.](rust-lang/rust#143031) Note: llvm-tools and MSI installers are missing but will be added in future releases. - [Promote `aarch64-pc-windows-msvc` to Tier 1](rust-lang/rust#145682) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. [platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html <a id="1.91.0-Libraries"></a> ## Libraries - [Print thread ID in panic message](rust-lang/rust#115746) - [Fix overly restrictive lifetime in `core::panic::Location::file` return type](rust-lang/rust#132087) - [Guarantee parameter order for `_by()` variants of `min` / `max`/ `minmax` in `std::cmp`](rust-lang/rust#139357) - [Document assumptions about `Clone` and `Eq` traits](rust-lang/rust#144330) - [`std::thread`: Return error if setting thread stack size fails](rust-lang/rust#144210) This used to panic within the standard library. <a id="1.91.0-Stabilized-APIs"></a> ## Stabilized APIs - [`Path::file_prefix`](https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.file_prefix) - [`AtomicPtr::fetch_ptr_add`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_ptr_add) - [`AtomicPtr::fetch_ptr_sub`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_ptr_sub) - [`AtomicPtr::fetch_byte_add`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_byte_add) - [`AtomicPtr::fetch_byte_sub`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_byte_sub) - [`AtomicPtr::fetch_or`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_or) - [`AtomicPtr::fetch_and`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_and) - [`AtomicPtr::fetch_xor`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_xor) - [`{integer}::strict_add`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_add) - [`{integer}::strict_sub`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_sub) - [`{integer}::strict_mul`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_mul) - [`{integer}::strict_div`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_div) - [`{integer}::strict_div_euclid`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_div_euclid) - [`{integer}::strict_rem`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_rem) - [`{integer}::strict_rem_euclid`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_rem_euclid) - [`{integer}::strict_neg`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_neg) - [`{integer}::strict_shl`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_shl) - [`{integer}::strict_shr`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_shr) - [`{integer}::strict_pow`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_pow) - [`i{N}::strict_add_unsigned`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_add_unsigned) - [`i{N}::strict_sub_unsigned`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_sub_unsigned) - [`i{N}::strict_abs`](https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_abs) - [`u{N}::strict_add_signed`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_add_signed) - [`u{N}::strict_sub_signed`](https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_sub_signed) - [`PanicHookInfo::payload_as_str`](https://doc.rust-lang.org/stable/std/panic/struct.PanicHookInfo.html#method.payload_as_str) - [`core::iter::chain`](https://doc.rust-lang.org/stable/core/iter/fn.chain.html) - [`u{N}::checked_signed_diff`](https://doc.rust-lang.org/stable/std/primitive.u16.html#method.checked_signed_diff) - [`core::array::repeat`](https://doc.rust-lang.org/stable/core/array/fn.repeat.html) - [`PathBuf::add_extension`](https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.add_extension) - [`PathBuf::with_added_extension`](https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.with_added_extension) - [`Duration::from_mins`](https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_mins) - [`Duration::from_hours`](https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_hours) - [`impl PartialEq<str> for PathBuf`](https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#impl-PartialEq%3Cstr%3E-for-PathBuf) - [`impl PartialEq<String> for PathBuf`](https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#impl-PartialEq%3CString%3E-for-PathBuf) - [`impl PartialEq<str> for Path`](https://doc.rust-lang.org/stable/std/path/struct.Path.html#impl-PartialEq%3Cstr%3E-for-Path) - [`impl PartialEq<String> for Path`](https://doc.rust-lang.org/stable/std/path/struct.Path.html#impl-PartialEq%3CString%3E-for-Path) - [`impl PartialEq<PathBuf> for String`](https://doc.rust-lang.org/stable/std/string/struct.String.html#impl-PartialEq%3CPathBuf%3E-for-String) - [`impl PartialEq<Path> for String`](https://doc.rust-lang.org/stable/std/string/struct.String.html#impl-PartialEq%3CPath%3E-for-String) - [`impl PartialEq<PathBuf> for str`](https://doc.rust-lang.org/stable/std/primitive.str.html#impl-PartialEq%3CPathBuf%3E-for-str) - [`impl PartialEq<Path> for str`](https://doc.rust-lang.org/stable/std/primitive.str.html#impl-PartialEq%3CPath%3E-for-str) - [`Ipv4Addr::from_octets`](https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.from_octets) - [`Ipv6Addr::from_octets`](https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.from_octets) - [`Ipv6Addr::from_segments`](https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.from_segments) - [`impl<T> Default for Pin<Box<T>> where Box<T>: Default, T: ?Sized`](https://doc.rust-lang.org/stable/std/default/trait.Default.html#impl-Default-for-Pin%3CBox%3CT%3E%3E) - [`impl<T> Default for Pin<Rc<T>> where Rc<T>: Default, T: ?Sized`](https://doc.rust-lang.org/stable/std/default/trait.Default.html#impl-Default-for-Pin%3CRc%3CT%3E%3E) - [`impl<T> Default for Pin<Arc<T>> where Arc<T>: Default, T: ?Sized`](https://doc.rust-lang.org/stable/std/default/trait.Default.html#impl-Default-for-Pin%3CArc%3CT%3E%3E) - [`Cell::as_array_of_cells`](https://doc.rust-lang.org/stable/std/cell/struct.Cell.html#method.as_array_of_cells) - [`u{N}::carrying_add`](https://doc.rust-lang.org/stable/std/primitive.u64.html#method.carrying_add) - [`u{N}::borrowing_sub`](https://doc.rust-lang.org/stable/std/primitive.u64.html#method.borrowing_sub) - [`u{N}::carrying_mul`](https://doc.rust-lang.org/stable/std/primitive.u64.html#method.carrying_mul) - [`u{N}::carrying_mul_add`](https://doc.rust-lang.org/stable/std/primitive.u64.html#method.carrying_mul_add) - [`BTreeMap::extract_if`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.extract_if) - [`BTreeSet::extract_if`](https://doc.rust-lang.org/stable/std/collections/struct.BTreeSet.html#method.extract_if) - [`impl Debug for windows::ffi::EncodeWide<'_>`](https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-Debug-for-EncodeWide%3C'_%3E) - [`str::ceil_char_boundary`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.ceil_char_boundary) - [`str::floor_char_boundary`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.floor_char_boundary) - [`impl Sum for Saturating<u{N}>`](https://doc.rust-lang.org/stable/std/num/struct.Saturating.html#impl-Sum-for-Saturating%3Cu32%3E) - [`impl Sum<&Self> for Saturating<u{N}>`](https://doc.rust-lang.org/stable/std/num/struct.Saturating.html#impl-Sum%3C%26Saturating%3Cu32%3E%3E-for-Saturating%3Cu32%3E) - [`impl Product for Saturating<u{N}>`](https://doc.rust-lang.org/stable/std/num/struct.Saturating.html#impl-Product-for-Saturating%3Cu32%3E) - [`impl Product<&Self> for Saturating<u{N}>`](https://doc.rust-lang.org/stable/std/num/struct.Saturating.html#impl-Product%3C%26Saturating%3Cu32%3E%3E-for-Saturating%3Cu32%3E) These previously stable APIs are now stable in const contexts: - [`<[T; N]>::each_ref`](https://doc.rust-lang.org/stable/std/primitive.array.html#method.each_ref) - [`<[T; N]>::each_mut`](https://doc.rust-lang.org/stable/std/primitive.array.html#method.each_mut) - [`OsString::new`](https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.new) - [`PathBuf::new`](https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.new) - [`TypeId::of`](https://doc.rust-lang.org/stable/std/any/struct.TypeId.html#method.of) - [`ptr::with_exposed_provenance`](https://doc.rust-lang.org/stable/std/ptr/fn.with_exposed_provenance.html) - [`ptr::with_exposed_provenance_mut`](https://doc.rust-lang.org/stable/std/ptr/fn.with_exposed_provenance_mut.html) <a id="1.91.0-Cargo"></a> ## Cargo - 🎉 Stabilize `build.build-dir`. This config sets the directory where intermediate build artifacts are stored. These artifacts are produced by Cargo and rustc during the build process. End users usually won't need to interact with them, and the layout inside `build-dir` is an implementation detail that may change without notice. ([config doc](https://doc.rust-lang.org/stable/cargo/reference/config.html#buildbuild-dir)) ([build cache doc](https://doc.rust-lang.org/stable/cargo/reference/build-cache.html)) [#15833](rust-lang/cargo#15833) [#15840](rust-lang/cargo#15840) - The `--target` flag and the `build.target` configuration can now take literal `"host-tuple"` string, which will internally be substituted by the host machine's target triple. [#15838](rust-lang/cargo#15838) [#16003](rust-lang/cargo#16003) [#16032](rust-lang/cargo#16032) <a id="1.91.0-Rustdoc"></a> ## Rustdoc - [In search results, rank doc aliases lower than non-alias items with the same name](rust-lang/rust#145100) - [Raw pointers now work in type-based search like references](rust-lang/rust#145731). This means you can now search for things like `*const u8 ->`, and additionally functions that take or return raw pointers will now display their signature properly in search results. <a id="1.91.0-Compatibility-Notes"></a> ## Compatibility Notes - [Always require coroutine captures to be drop-live](rust-lang/rust#144156) - [Apple: Always pass SDK root when linking with `cc`, and pass it via `SDKROOT` env var](rust-lang/rust#131477). This should fix linking issues with `rustc` running inside Xcode. Libraries in `/usr/local/lib` may no longer be linked automatically, if you develop or use a crate that relies on this, you should explicitly set `cargo::rustc-link-search=/usr/local/lib` in a `build.rs` script. - [Relaxed bounds in associated type bound position like in `TraitRef<AssocTy: ?Sized>` are now correctly forbidden](rust-lang/rust#135331) - [Add unstable `#[sanitize(xyz = "on|off")]` built-in attribute that shadows procedural macros with the same name](rust-lang/rust#142681) - [Fix the drop checker being more permissive for bindings declared with let-else](rust-lang/rust#143028) - [Be more strict when parsing attributes, erroring on many invalid attributes](rust-lang/rust#144689) - [Error on invalid `#[should_panic]` attributes](rust-lang/rust#143808) - [Error on invalid `#[link]` attributes](rust-lang/rust#143193) - [Mark all deprecation lints in name resolution as deny-by-default and also report in dependencies](rust-lang/rust#143929) - The lint `semicolon_in_expressions_from_macros`, for `macro_rules!` macros in expression position that expand to end in a semicolon (`;`), is now deny-by-default. It was already warn-by-default, and a future compatibility warning (FCW) that warned even in dependencies. This lint will become a hard error in the future. - [Trait impl modifiers (e.g., `unsafe`, `!`, `default`) in inherent impls are no longer syntactically valid](rust-lang/rust#144386) - [Start reporting future breakage for `ill_formed_attribute_input` in dependencies](rust-lang/rust#144544) - [Restrict the scope of temporaries created by the macros `pin!`, `format_args!`, `write!`, and `writeln!` in `if let` scrutinees in Rust Edition 2024.](rust-lang/rust#145342) This applies [Rust Edition 2024's `if let` temporary scope rules](https://doc.rust-lang.org/edition-guide/rust-2024/temporary-if-let-scope.html) to these temporaries, which previously could live past the `if` expression regardless of Edition. - [Invalid numeric literal suffixes in tuple indexing, tuple struct indexing, and struct field name positions are now correctly rejected](rust-lang/rust#145463) - [Closures marked with the keyword `static` are now syntactically invalid](rust-lang/rust#145604) - [Shebangs inside `--cfg` and `--check-cfg` arguments are no longer allowed](rust-lang/rust#146211) - [Add future incompatibility lint for temporary lifetime shortening in Rust 1.92](rust-lang/rust#147056) Cargo compatibility notes: - `cargo publish` no longer keeps `.crate` tarballs as final build artifacts when `build.build-dir` is set. These tarballs were previously included due to an oversight and are now treated as intermediate artifacts. To get `.crate` tarballs as final artifacts, use `cargo package`. In a future version, this change will apply regardless of `build.build-dir`. [#15910](rust-lang/cargo#15910) - Adjust Cargo messages to match rustc diagnostic style. This changes some of the terminal colors used by Cargo messages. [#15928](rust-lang/cargo#15928) - Tools and projects relying on the [internal details of Cargo's `build-dir`](https://doc.rust-lang.org/cargo/reference/build-cache.html) may not work for users changing their `build-dir` layout. For those doing so, we'd recommend proactively testing these cases particularly as we are considering changing the default location of the `build-dir` in the future ([cargo#16147](rust-lang/cargo#16147)). If you can't migrate off of Cargo's internal details, we'd like to learn more about your use case as we prepare to change the layout of the `build-dir` ([cargo#15010](rust-lang/cargo#15010)). <a id="1.91.0-Internal-Changes"></a> ## Internal Changes These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Update to LLVM 21](rust-lang/rust#143684) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this MR, check this box --- This MR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

Pkgsrc changes: * Adjust patches to adapt to upstream changes and new versions. * assosicated checksums * Add a workaround for LLVM mis-using -isystem. Reported upstream at llvm/llvm-project#166420 Noteable failures at the time of commit: * The cross-build for armv6 fails, reported upstream at rust-lang/rust#148464 * The cross-build for powerpc fails, reported upstream at rust-lang/rust#148497 This is R_PPC_PLTREL24 which now has insufficient range. Asked for recpie for directing the rust code generator to cope. Upstream changes relative to 1.90.0: Version 1.91.0 (2025-10-30) ========================== Language -------- - [Lower pattern bindings in the order they're written and base drop order on primary bindings' order] (rust-lang/rust#143764) - [Stabilize declaration of C-style variadic functions for `sysv64`, `win64`, `efiapi`, and `aapcs` ABIs] (rust-lang/rust#144066). This brings these ABIs in line with the C ABI: variadic functions can be declared in extern blocks but not defined. - [Add `dangling_pointers_from_locals` lint to warn against dangling pointers from local variables] (rust-lang/rust#144322) - [Upgrade `semicolon_in_expressions_from_macros` from warn to deny] (rust-lang/rust#144369) - [Stabilize LoongArch32 inline assembly] (rust-lang/rust#144402) - [Add warn-by-default `integer_to_ptr_transmutes` lint against integer-to-pointer transmutes] (rust-lang/rust#144531) - [Stabilize `sse4a` and `tbm` target features] (rust-lang/rust#144542) - [Add `target_env = "macabi"` and `target_env = "sim"` cfgs] (rust-lang/rust#139451) as replacements for the `target_abi` cfgs with the same values. Compiler -------- - [Don't warn on never-to-any `as` casts as unreachable] (rust-lang/rust#144804) Platform Support ---------------- - [Promote `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` to Tier 2 with host tools.] (rust-lang/rust#143031) Note: llvm-tools and MSI installers are missing but will be added in future releases. - [Promote `aarch64-pc-windows-msvc` to Tier 1] (rust-lang/rust#145682) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. [platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html Libraries --------- - [Print thread ID in panic message] (rust-lang/rust#115746) - [Fix overly restrictive lifetime in `core::panic::Location::file` return type] (rust-lang/rust#132087) - [Guarantee parameter order for `_by()` variants of `min` / `max`/ `minmax` in `std::cmp`] (rust-lang/rust#139357) - [Document assumptions about `Clone` and `Eq` traits] (rust-lang/rust#144330) - [`std::thread`: Return error if setting thread stack size fails] (rust-lang/rust#144210) This used to panic within the standard library. Stabilized APIs --------------- - [`Path::file_prefix`] (https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.file_prefix) - [`AtomicPtr::fetch_ptr_add`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_ptr_add) - [`AtomicPtr::fetch_ptr_sub`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_ptr_sub) - [`AtomicPtr::fetch_byte_add`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_byte_add) - [`AtomicPtr::fetch_byte_sub`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_byte_sub) - [`AtomicPtr::fetch_or`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_or) - [`AtomicPtr::fetch_and`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_and) - [`AtomicPtr::fetch_xor`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.fetch_xor) - [`{integer}::strict_add`] (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_add) - [`{integer}::strict_sub`] (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_sub) - [`{integer}::strict_mul`] (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_mul) - [`{integer}::strict_div`] (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_div) - [`{integer}::strict_div_euclid`] (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_div_euclid) - [`{integer}::strict_rem`] (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_rem) - [`{integer}::strict_rem_euclid`] (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_rem_euclid) - [`{integer}::strict_neg`] (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_neg) - [`{integer}::strict_shl`] (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_shl) - [`{integer}::strict_shr`] (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_shr) - [`{integer}::strict_pow`] (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_pow) - [`i{N}::strict_add_unsigned`] (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_add_unsigned) - [`i{N}::strict_sub_unsigned`] (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_sub_unsigned) - [`i{N}::strict_abs`] (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.strict_abs) - [`u{N}::strict_add_signed`] (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_add_signed) - [`u{N}::strict_sub_signed`] (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.strict_sub_signed) - [`PanicHookInfo::payload_as_str`] (https://doc.rust-lang.org/stable/std/panic/struct.PanicHookInfo.html#method.payload_as_str) - [`core::iter::chain`] (https://doc.rust-lang.org/stable/core/iter/fn.chain.html) - [`u{N}::checked_signed_diff`] (https://doc.rust-lang.org/stable/std/primitive.u16.html#method.checked_signed_diff) - [`core::array::repeat`] (https://doc.rust-lang.org/stable/core/array/fn.repeat.html) - [`PathBuf::add_extension`] (https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.add_extension) - [`PathBuf::with_added_extension`] (https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.with_added_extension) - [`Duration::from_mins`] (https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_mins) - [`Duration::from_hours`] (https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_hours) - [`impl PartialEq<str> for PathBuf`] (https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#impl-PartialEq%3Cstr%3E-for-PathBuf) - [`impl PartialEq<String> for PathBuf`] (https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#impl-PartialEq%3CString%3E-for-PathBuf) - [`impl PartialEq<str> for Path`] (https://doc.rust-lang.org/stable/std/path/struct.Path.html#impl-PartialEq%3Cstr%3E-for-Path) - [`impl PartialEq<String> for Path`] (https://doc.rust-lang.org/stable/std/path/struct.Path.html#impl-PartialEq%3CString%3E-for-Path) - [`impl PartialEq<PathBuf> for String`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#impl-PartialEq%3CPathBuf%3E-for-String) - [`impl PartialEq<Path> for String`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#impl-PartialEq%3CPath%3E-for-String) - [`impl PartialEq<PathBuf> for str`] (https://doc.rust-lang.org/stable/std/primitive.str.html#impl-PartialEq%3CPathBuf%3E-for-str) - [`impl PartialEq<Path> for str`] (https://doc.rust-lang.org/stable/std/primitive.str.html#impl-PartialEq%3CPath%3E-for-str) - [`Ipv4Addr::from_octets`] (https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.from_octets) - [`Ipv6Addr::from_octets`] (https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.from_octets) - [`Ipv6Addr::from_segments`] (https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.from_segments) - [`impl<T> Default for Pin<Box<T>> where Box<T>: Default, T: ?Sized`] (https://doc.rust-lang.org/stable/std/default/trait.Default.html#impl-Default-for-Pin%3CBox%3CT%3E%3E) - [`impl<T> Default for Pin<Rc<T>> where Rc<T>: Default, T: ?Sized`] (https://doc.rust-lang.org/stable/std/default/trait.Default.html#impl-Default-for-Pin%3CRc%3CT%3E%3E) - [`impl<T> Default for Pin<Arc<T>> where Arc<T>: Default, T: ?Sized`] (https://doc.rust-lang.org/stable/std/default/trait.Default.html#impl-Default-for-Pin%3CArc%3CT%3E%3E) - [`Cell::as_array_of_cells`] (https://doc.rust-lang.org/stable/std/cell/struct.Cell.html#method.as_array_of_cells) - [`u{N}::carrying_add`] (https://doc.rust-lang.org/stable/std/primitive.u64.html#method.carrying_add) - [`u{N}::borrowing_sub`] (https://doc.rust-lang.org/stable/std/primitive.u64.html#method.borrowing_sub) - [`u{N}::carrying_mul`] (https://doc.rust-lang.org/stable/std/primitive.u64.html#method.carrying_mul) - [`u{N}::carrying_mul_add`] (https://doc.rust-lang.org/stable/std/primitive.u64.html#method.carrying_mul_add) - [`BTreeMap::extract_if`] (https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.extract_if) - [`BTreeSet::extract_if`] (https://doc.rust-lang.org/stable/std/collections/struct.BTreeSet.html#method.extract_if) - [`impl Debug for windows::ffi::EncodeWide<'_>`] (https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-Debug-for-EncodeWide%3C'_%3E) - [`str::ceil_char_boundary`] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.ceil_char_boundary) - [`str::floor_char_boundary`] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.floor_char_boundary) - [`impl Sum for Saturating<u{N}>`] (https://doc.rust-lang.org/stable/std/num/struct.Saturating.html#impl-Sum-for-Saturating%3Cu32%3E) - [`impl Sum<&Self> for Saturating<u{N}>`] (https://doc.rust-lang.org/stable/std/num/struct.Saturating.html#impl-Sum%3C%26Saturating%3Cu32%3E%3E-for-Saturating%3Cu32%3E) - [`impl Product for Saturating<u{N}>`] (https://doc.rust-lang.org/stable/std/num/struct.Saturating.html#impl-Product-for-Saturating%3Cu32%3E) - [`impl Product<&Self> for Saturating<u{N}>`] (https://doc.rust-lang.org/stable/std/num/struct.Saturating.html#impl-Product%3C%26Saturating%3Cu32%3E%3E-for-Saturating%3Cu32%3E) These previously stable APIs are now stable in const contexts: - [`<[T; N]>::each_ref`] (https://doc.rust-lang.org/stable/std/primitive.array.html#method.each_ref) - [`<[T; N]>::each_mut`] (https://doc.rust-lang.org/stable/std/primitive.array.html#method.each_mut) - [`OsString::new`] (https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.new) - [`PathBuf::new`] (https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.new) - [`TypeId::of`] (https://doc.rust-lang.org/stable/std/any/struct.TypeId.html#method.of) - [`ptr::with_exposed_provenance`] (https://doc.rust-lang.org/stable/std/ptr/fn.with_exposed_provenance.html) - [`ptr::with_exposed_provenance_mut`] (https://doc.rust-lang.org/stable/std/ptr/fn.with_exposed_provenance_mut.html) Cargo ----- - 🎉 Stabilize `build.build-dir`. This config sets the directory where intermediate build artifacts are stored. These artifacts are produced by Cargo and rustc during the build process. End users usually won't need to interact with them, and the layout inside `build-dir` is an implementation detail that may change without notice. ([config doc] (https://doc.rust-lang.org/stable/cargo/reference/config.html#buildbuild-dir)) ([build cache doc] (https://doc.rust-lang.org/stable/cargo/reference/build-cache.html)) [#15833](rust-lang/cargo#15833) [#15840](rust-lang/cargo#15840) - The `--target` flag and the `build.target` configuration can now take literal `"host-tuple"` string, which will internally be substituted by the host machine's target triple. [#15838](rust-lang/cargo#15838) [#16003](rust-lang/cargo#16003) [#16032](rust-lang/cargo#16032) Rustdoc ----- - [In search results, rank doc aliases lower than non-alias items with the same name](rust-lang/rust#145100) - [Raw pointers now work in type-based search like references] (rust-lang/rust#145731). This means you can now search for things like `*const u8 ->`, and additionally functions that take or return raw pointers will now display their signature properly in search results. Compatibility Notes ------------------- - [Always require coroutine captures to be drop-live] (rust-lang/rust#144156) - [Apple: Always pass SDK root when linking with `cc`, and pass it via `SDKROOT` env var] (rust-lang/rust#131477). This should fix linking issues with `rustc` running inside Xcode. Libraries in `/usr/local/lib` may no longer be linked automatically, if you develop or use a crate that relies on this, you should explicitly set `cargo::rustc-link-search=/usr/local/lib` in a `build.rs` script. - [Relaxed bounds in associated type bound position like in `TraitRef<AssocTy: ?Sized>` are now correctly forbidden] (rust-lang/rust#135331) - [Add unstable `#[sanitize(xyz = "on|off")]` built-in attribute that shadows procedural macros with the same name] (rust-lang/rust#142681) - [Fix the drop checker being more permissive for bindings declared with let-else] (rust-lang/rust#143028) - [Be more strict when parsing attributes, erroring on many invalid attributes] (rust-lang/rust#144689) - [Error on invalid `#[should_panic]` attributes] (rust-lang/rust#143808) - [Error on invalid `#[link]` attributes] (rust-lang/rust#143193) - [Mark all deprecation lints in name resolution as deny-by-default and also report in dependencies] (rust-lang/rust#143929) - The lint `semicolon_in_expressions_from_macros`, for `macro_rules!` macros in expression position that expand to end in a semicolon (`;`), is now deny-by-default. It was already warn-by-default, and a future compatibility warning (FCW) that warned even in dependencies. This lint will become a hard error in the future. - [Trait impl modifiers (e.g., `unsafe`, `!`, `default`) in inherent impls are no longer syntactically valid] (rust-lang/rust#144386) - [Start reporting future breakage for `ill_formed_attribute_input` in dependencies] (rust-lang/rust#144544) - [Restrict the scope of temporaries created by the macros `pin!`, `format_args!`, `write!`, and `writeln!` in `if let` scrutinees in Rust Edition 2024.] (rust-lang/rust#145342) This applies [Rust Edition 2024's `if let` temporary scope rules] (https://doc.rust-lang.org/edition-guide/rust-2024/temporary-if-let-scope.html) to these temporaries, which previously could live past the `if` expression regardless of Edition. - [Invalid numeric literal suffixes in tuple indexing, tuple struct indexing, and struct field name positions are now correctly rejected] (rust-lang/rust#145463) - [Closures marked with the keyword `static` are now syntactically invalid] (rust-lang/rust#145604) - [Shebangs inside `--cfg` and `--check-cfg` arguments are no longer allowed] (rust-lang/rust#146211) - [Add future incompatibility lint for temporary lifetime shortening in Rust 1.92] (rust-lang/rust#147056) Cargo compatibility notes: - `cargo publish` no longer keeps `.crate` tarballs as final build artifacts when `build.build-dir` is set. These tarballs were previously included due to an oversight and are now treated as intermediate artifacts. To get `.crate` tarballs as final artifacts, use `cargo package`. In a future version, this change will apply regardless of `build.build-dir`. [#15910](rust-lang/cargo#15910) - Adjust Cargo messages to match rustc diagnostic style. This changes some of the terminal colors used by Cargo messages. [#15928](rust-lang/cargo#15928) - Tools and projects relying on the [internal details of Cargo's `build-dir`] (https://doc.rust-lang.org/cargo/reference/build-cache.html) may not work for users changing their `build-dir` layout. For those doing so, we'd recommend proactively testing these cases particularly as we are considering changing the default location of the `build-dir` in the future ([cargo#16147](rust-lang/cargo#16147)). If you can't migrate off of Cargo's internal details, we'd like to learn more about your use case as we prepare to change the layout of the `build-dir` ([cargo#15010] (rust-lang/cargo#15010)). Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Update to LLVM 21](rust-lang/rust#143684)

rustbot assigned petrochenkov Jul 27, 2025

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Add doc for sse4a and tbm rust-lang/reference#1949

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Stabilize sse4a and tbm target features

100d19c

- remove some stabilized target features from `gate.rs`

sayantn force-pushed the stabilize-sse4a-tbm branch from 3200d1f to 100d19c Compare August 13, 2025 20:38

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Draft release notes for 1.91 #147010

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sayantn deleted the stabilize-sse4a-tbm branch October 8, 2025 10:27

Stabilize sse4a and tbm target features #144542

Stabilize sse4a and tbm target features #144542

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rust-timer commented Aug 14, 2025

Overall result: ❌✅ regressions and improvements - please read the text below

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Mark-Simulacrum commented Aug 19, 2025

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14 participants

Stabilize `sse4a` and `tbm` target features #144542

Stabilize `sse4a` and `tbm` target features #144542

sayantn commented Jul 27, 2025 •

edited by traviscross

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traviscross commented Jul 28, 2025 •

edited

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rfcbot commented Jul 30, 2025 •

edited

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