Sync from portable simd 2026 07 20 by folkertdev · Pull Request #159582 · rust-lang/rust

folkertdev · 2026-07-19T22:10:45Z

feel free to r+ once green

the `float-cmp` and `num-traits` libraries don't (yet) support f16. Turns out we didn't really need much from them, just the ulps check. I've adapted the ulps check from miri instead

relevant for the cranelift backend, possibly other cases/targets too

Fix pointer API to match what was stabilized

We can do swizzles for 24, 32, 48 and 64 byte vectors by stacking multiple TBL instructions. See https://godbolt.org/z/PE95nrqjj for a comparison of the generated assembly.

Optimize `swizzle_dyn` for AArch64 with N > 16

`From` impls were already provided for the normal AArch64 ACLE vector types, but not for the x2,x3,x4 tuples of ACLE vectors. Rectify that. Also provide impls for vectors of `f16`, as I noticed they were missing.

For symmetry with `Mask::first_set`

Add `Mask::last_set` method

…mpls Provide `From` impls for AArch64 ACLE tuple types.

Use `impl` restrictions over hand-sealed traits

Optimize `swizzle_dyn` for LoongArch64 with N is 16 or 32

run `f16` float tests

…nelift backend

…m-portable-simd-2026-07-20

rustbot · 2026-07-19T22:10:48Z

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

cc @calebzulawski, @programmerjake

rustbot · 2026-07-19T22:10:50Z

⚠️Warning⚠️

There are issue links (such as #123) in the commit messages of the following commits.
Please move them to the PR description, to avoid spamming the issues with references to the commit, and so this bot can automatically canonicalize them to avoid issues with subtree.
- 7d497cc
The following commits have merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.
You can start a rebase with the following commands:
```
$ # rebase
$ git pull --rebase https://github.com/rust-lang/rust.git main
$ git push --force-with-lease
```

folkertdev · 2026-07-19T22:14:02Z

This sync (specifically ignoring f16 tests) will help with rust-lang/rustc_codegen_cranelift#1675

rustbot · 2026-07-20T10:17:43Z

miri is developed in its own repository. If the Miri part of this change can be broken out, consider making this change to rust-lang/miri instead. However, if Miri needs adjusting for rustc changes, just ignore this message.

cc @rust-lang/miri

RalfJung · 2026-07-21T07:56:08Z

That's the test running with Miri's deliberately-imprecise float operations. But it's odd that it would start failing now. Probably the test is already latently buggy in main but this PR triggers the bad non-determinism.

The fix should be to make

rust/library/coretests/tests/num/floats.rs

Line 82 in 5a8cd23

constLOG_APPROX:Self = 1e-2;

bigger on Miri.

rustbot · 2026-07-21T10:59:54Z

Any special-casing of Miri in the standard library requires review.

cc @rust-lang/miri

folkertdev · 2026-07-21T11:00:05Z

@bors try jobs=x86_64-gnu-aux

…, r=<try> Sync from portable simd 2026 07 20 try-job: x86_64-gnu-aux

rust-bors · 2026-07-21T13:45:31Z

☀️ Try build successful (CI)
Build commit: b8f3ee8 (b8f3ee823c31d65751056ef71dd017ff752348b4)
Base parent: cde3f8a (cde3f8aee5a30928872e2438e3f18238a3fa306c)

RalfJung · 2026-07-21T13:52:18Z

@bors r=oli-obk

rust-bors · 2026-07-21T13:52:20Z

📌 Commit e547ba4 has been approved by oli-obk

It is now in the queue for this repository.

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 12 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159411 ([rustdoc] Correctly handle output options with --show-coverage) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

rust-bors · 2026-07-22T03:07:33Z

⌛ Testing commit e547ba4 with merge 1192fdc...

Workflow: https://github.com/rust-lang/rust/actions/runs/29887627022

@ghost

…, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

jhpratt · 2026-07-22T03:09:15Z

yielding to retrying the rollup

@bors yield

rust-bors · 2026-07-22T03:09:18Z

Auto build was cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/29887627022

The next pull request likely to be tested is #159697.

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

Rollup merge of #159582 - folkertdev:sync-from-portable-simd-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - rust-lang/rust#159582 (Sync from portable simd 2026 07 20) - rust-lang/rust#158890 (Fix splat v0 mangling) - rust-lang/rust#159614 (debuginfo generation for unsafe binders) - rust-lang/rust#159647 (Remove `early_exit` closures) - rust-lang/rust#159656 (define a `Simd` type in `minicore`) - rust-lang/rust#156474 (Add paths for linked associated items) - rust-lang/rust#159211 (Fix debuginfo argument when invoking LLBC linker) - rust-lang/rust#159527 (Bring runtime symbols statics on par with foreign functions) - rust-lang/rust#159625 (Refactor is_opsem_inhabited) - rust-lang/rust#159629 (Add more splat rust-call regression tests) - rust-lang/rust#159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - rust-lang/rust#159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - rust-lang/rust#159663 (Add layout cycle hang regression test)

folkertdev · 2026-07-19T22:10:45Z

View all comments

r? @ghost

feel free to r+ once green

the `float-cmp` and `num-traits` libraries don't (yet) support f16. Turns out we didn't really need much from them, just the ulps check. I've adapted the ulps check from miri instead

relevant for the cranelift backend, possibly other cases/targets too

Fix pointer API to match what was stabilized

We can do swizzles for 24, 32, 48 and 64 byte vectors by stacking multiple TBL instructions. See https://godbolt.org/z/PE95nrqjj for a comparison of the generated assembly.

Optimize `swizzle_dyn` for AArch64 with N > 16

`From` impls were already provided for the normal AArch64 ACLE vector types, but not for the x2,x3,x4 tuples of ACLE vectors. Rectify that. Also provide impls for vectors of `f16`, as I noticed they were missing.

For symmetry with `Mask::first_set`

Add `Mask::last_set` method

…mpls Provide `From` impls for AArch64 ACLE tuple types.

Use `impl` restrictions over hand-sealed traits

Optimize `swizzle_dyn` for LoongArch64 with N is 16 or 32

run `f16` float tests

…nelift backend

…m-portable-simd-2026-07-20

rustbot · 2026-07-19T22:10:48Z

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

cc @calebzulawski, @programmerjake

rustbot · 2026-07-19T22:10:50Z

⚠️Warning⚠️

There are issue links (such as #123) in the commit messages of the following commits.
Please move them to the PR description, to avoid spamming the issues with references to the commit, and so this bot can automatically canonicalize them to avoid issues with subtree.
- 7d497cc
The following commits have merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.
You can start a rebase with the following commands:
```
$ # rebase
$ git pull --rebase https://github.com/rust-lang/rust.git main
$ git push --force-with-lease
```

folkertdev · 2026-07-19T22:14:02Z

This sync (specifically ignoring f16 tests) will help with rust-lang/rustc_codegen_cranelift#1675

rustbot · 2026-07-20T10:17:43Z

miri is developed in its own repository. If the Miri part of this change can be broken out, consider making this change to rust-lang/miri instead. However, if Miri needs adjusting for rustc changes, just ignore this message.

cc @rust-lang/miri

RalfJung · 2026-07-21T07:56:08Z

That's the test running with Miri's deliberately-imprecise float operations. But it's odd that it would start failing now. Probably the test is already latently buggy in main but this PR triggers the bad non-determinism.

The fix should be to make

rust/library/coretests/tests/num/floats.rs

Line 82 in 5a8cd23

constLOG_APPROX:Self = 1e-2;

bigger on Miri.

rustbot · 2026-07-21T10:59:54Z

Any special-casing of Miri in the standard library requires review.

cc @rust-lang/miri

folkertdev · 2026-07-21T11:00:05Z

@bors try jobs=x86_64-gnu-aux

…, r=<try> Sync from portable simd 2026 07 20 try-job: x86_64-gnu-aux

rust-bors · 2026-07-21T13:45:31Z

☀️ Try build successful (CI)
Build commit: b8f3ee8 (b8f3ee823c31d65751056ef71dd017ff752348b4)
Base parent: cde3f8a (cde3f8aee5a30928872e2438e3f18238a3fa306c)

RalfJung · 2026-07-21T13:52:18Z

@bors r=oli-obk

rust-bors · 2026-07-21T13:52:20Z

📌 Commit e547ba4 has been approved by oli-obk

It is now in the queue for this repository.

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 12 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159411 ([rustdoc] Correctly handle output options with --show-coverage) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

rust-bors · 2026-07-22T03:07:33Z

⌛ Testing commit e547ba4 with merge 1192fdc...

Workflow: https://github.com/rust-lang/rust/actions/runs/29887627022

@ghost

…, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

jhpratt · 2026-07-22T03:09:15Z

yielding to retrying the rollup

@bors yield

rust-bors · 2026-07-22T03:09:18Z

Auto build was cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/29887627022

The next pull request likely to be tested is #159697.

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

Rollup merge of #159582 - folkertdev:sync-from-portable-simd-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - rust-lang/rust#159582 (Sync from portable simd 2026 07 20) - rust-lang/rust#158890 (Fix splat v0 mangling) - rust-lang/rust#159614 (debuginfo generation for unsafe binders) - rust-lang/rust#159647 (Remove `early_exit` closures) - rust-lang/rust#159656 (define a `Simd` type in `minicore`) - rust-lang/rust#156474 (Add paths for linked associated items) - rust-lang/rust#159211 (Fix debuginfo argument when invoking LLBC linker) - rust-lang/rust#159527 (Bring runtime symbols statics on par with foreign functions) - rust-lang/rust#159625 (Refactor is_opsem_inhabited) - rust-lang/rust#159629 (Add more splat rust-call regression tests) - rust-lang/rust#159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - rust-lang/rust#159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - rust-lang/rust#159663 (Add layout cycle hang regression test)

folkertdev · 2026-07-19T22:10:45Z

View all comments

r? @ghost

feel free to r+ once green

the `float-cmp` and `num-traits` libraries don't (yet) support f16. Turns out we didn't really need much from them, just the ulps check. I've adapted the ulps check from miri instead

relevant for the cranelift backend, possibly other cases/targets too

Fix pointer API to match what was stabilized

We can do swizzles for 24, 32, 48 and 64 byte vectors by stacking multiple TBL instructions. See https://godbolt.org/z/PE95nrqjj for a comparison of the generated assembly.

Optimize `swizzle_dyn` for AArch64 with N > 16

`From` impls were already provided for the normal AArch64 ACLE vector types, but not for the x2,x3,x4 tuples of ACLE vectors. Rectify that. Also provide impls for vectors of `f16`, as I noticed they were missing.

For symmetry with `Mask::first_set`

Add `Mask::last_set` method

…mpls Provide `From` impls for AArch64 ACLE tuple types.

Use `impl` restrictions over hand-sealed traits

Optimize `swizzle_dyn` for LoongArch64 with N is 16 or 32

run `f16` float tests

…nelift backend

…m-portable-simd-2026-07-20

rustbot · 2026-07-19T22:10:48Z

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

cc @calebzulawski, @programmerjake

rustbot · 2026-07-19T22:10:50Z

⚠️Warning⚠️

There are issue links (such as #123) in the commit messages of the following commits.
Please move them to the PR description, to avoid spamming the issues with references to the commit, and so this bot can automatically canonicalize them to avoid issues with subtree.
- 7d497cc
The following commits have merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.
You can start a rebase with the following commands:
```
$ # rebase
$ git pull --rebase https://github.com/rust-lang/rust.git main
$ git push --force-with-lease
```

folkertdev · 2026-07-19T22:14:02Z

This sync (specifically ignoring f16 tests) will help with rust-lang/rustc_codegen_cranelift#1675

rustbot · 2026-07-20T10:17:43Z

miri is developed in its own repository. If the Miri part of this change can be broken out, consider making this change to rust-lang/miri instead. However, if Miri needs adjusting for rustc changes, just ignore this message.

cc @rust-lang/miri

RalfJung · 2026-07-21T07:56:08Z

That's the test running with Miri's deliberately-imprecise float operations. But it's odd that it would start failing now. Probably the test is already latently buggy in main but this PR triggers the bad non-determinism.

The fix should be to make

rust/library/coretests/tests/num/floats.rs

Line 82 in 5a8cd23

constLOG_APPROX:Self = 1e-2;

bigger on Miri.

rustbot · 2026-07-21T10:59:54Z

Any special-casing of Miri in the standard library requires review.

cc @rust-lang/miri

folkertdev · 2026-07-21T11:00:05Z

@bors try jobs=x86_64-gnu-aux

…, r=<try> Sync from portable simd 2026 07 20 try-job: x86_64-gnu-aux

rust-bors · 2026-07-21T13:45:31Z

☀️ Try build successful (CI)
Build commit: b8f3ee8 (b8f3ee823c31d65751056ef71dd017ff752348b4)
Base parent: cde3f8a (cde3f8aee5a30928872e2438e3f18238a3fa306c)

RalfJung · 2026-07-21T13:52:18Z

@bors r=oli-obk

rust-bors · 2026-07-21T13:52:20Z

📌 Commit e547ba4 has been approved by oli-obk

It is now in the queue for this repository.

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 12 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159411 ([rustdoc] Correctly handle output options with --show-coverage) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

rust-bors · 2026-07-22T03:07:33Z

⌛ Testing commit e547ba4 with merge 1192fdc...

Workflow: https://github.com/rust-lang/rust/actions/runs/29887627022

@ghost

…, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

jhpratt · 2026-07-22T03:09:15Z

yielding to retrying the rollup

@bors yield

rust-bors · 2026-07-22T03:09:18Z

Auto build was cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/29887627022

The next pull request likely to be tested is #159697.

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

Rollup merge of #159582 - folkertdev:sync-from-portable-simd-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - rust-lang/rust#159582 (Sync from portable simd 2026 07 20) - rust-lang/rust#158890 (Fix splat v0 mangling) - rust-lang/rust#159614 (debuginfo generation for unsafe binders) - rust-lang/rust#159647 (Remove `early_exit` closures) - rust-lang/rust#159656 (define a `Simd` type in `minicore`) - rust-lang/rust#156474 (Add paths for linked associated items) - rust-lang/rust#159211 (Fix debuginfo argument when invoking LLBC linker) - rust-lang/rust#159527 (Bring runtime symbols statics on par with foreign functions) - rust-lang/rust#159625 (Refactor is_opsem_inhabited) - rust-lang/rust#159629 (Add more splat rust-call regression tests) - rust-lang/rust#159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - rust-lang/rust#159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - rust-lang/rust#159663 (Add layout cycle hang regression test)

folkertdev · 2026-07-19T22:10:45Z

View all comments

r? @ghost

feel free to r+ once green

the `float-cmp` and `num-traits` libraries don't (yet) support f16. Turns out we didn't really need much from them, just the ulps check. I've adapted the ulps check from miri instead

relevant for the cranelift backend, possibly other cases/targets too

Fix pointer API to match what was stabilized

We can do swizzles for 24, 32, 48 and 64 byte vectors by stacking multiple TBL instructions. See https://godbolt.org/z/PE95nrqjj for a comparison of the generated assembly.

Optimize `swizzle_dyn` for AArch64 with N > 16

`From` impls were already provided for the normal AArch64 ACLE vector types, but not for the x2,x3,x4 tuples of ACLE vectors. Rectify that. Also provide impls for vectors of `f16`, as I noticed they were missing.

For symmetry with `Mask::first_set`

Add `Mask::last_set` method

…mpls Provide `From` impls for AArch64 ACLE tuple types.

Use `impl` restrictions over hand-sealed traits

Optimize `swizzle_dyn` for LoongArch64 with N is 16 or 32

run `f16` float tests

…nelift backend

…m-portable-simd-2026-07-20

rustbot · 2026-07-19T22:10:48Z

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

cc @calebzulawski, @programmerjake

rustbot · 2026-07-19T22:10:50Z

⚠️Warning⚠️

There are issue links (such as #123) in the commit messages of the following commits.
Please move them to the PR description, to avoid spamming the issues with references to the commit, and so this bot can automatically canonicalize them to avoid issues with subtree.
- 7d497cc
The following commits have merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.
You can start a rebase with the following commands:
```
$ # rebase
$ git pull --rebase https://github.com/rust-lang/rust.git main
$ git push --force-with-lease
```

folkertdev · 2026-07-19T22:14:02Z

This sync (specifically ignoring f16 tests) will help with rust-lang/rustc_codegen_cranelift#1675

rustbot · 2026-07-20T10:17:43Z

miri is developed in its own repository. If the Miri part of this change can be broken out, consider making this change to rust-lang/miri instead. However, if Miri needs adjusting for rustc changes, just ignore this message.

cc @rust-lang/miri

RalfJung · 2026-07-21T07:56:08Z

That's the test running with Miri's deliberately-imprecise float operations. But it's odd that it would start failing now. Probably the test is already latently buggy in main but this PR triggers the bad non-determinism.

The fix should be to make

rust/library/coretests/tests/num/floats.rs

Line 82 in 5a8cd23

constLOG_APPROX:Self = 1e-2;

bigger on Miri.

rustbot · 2026-07-21T10:59:54Z

Any special-casing of Miri in the standard library requires review.

cc @rust-lang/miri

folkertdev · 2026-07-21T11:00:05Z

@bors try jobs=x86_64-gnu-aux

…, r=<try> Sync from portable simd 2026 07 20 try-job: x86_64-gnu-aux

rust-bors · 2026-07-21T13:45:31Z

☀️ Try build successful (CI)
Build commit: b8f3ee8 (b8f3ee823c31d65751056ef71dd017ff752348b4)
Base parent: cde3f8a (cde3f8aee5a30928872e2438e3f18238a3fa306c)

RalfJung · 2026-07-21T13:52:18Z

@bors r=oli-obk

rust-bors · 2026-07-21T13:52:20Z

📌 Commit e547ba4 has been approved by oli-obk

It is now in the queue for this repository.

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 12 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159411 ([rustdoc] Correctly handle output options with --show-coverage) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

rust-bors · 2026-07-22T03:07:33Z

⌛ Testing commit e547ba4 with merge 1192fdc...

Workflow: https://github.com/rust-lang/rust/actions/runs/29887627022

@ghost

…, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

jhpratt · 2026-07-22T03:09:15Z

yielding to retrying the rollup

@bors yield

rust-bors · 2026-07-22T03:09:18Z

Auto build was cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/29887627022

The next pull request likely to be tested is #159697.

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

Rollup merge of #159582 - folkertdev:sync-from-portable-simd-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - rust-lang/rust#159582 (Sync from portable simd 2026 07 20) - rust-lang/rust#158890 (Fix splat v0 mangling) - rust-lang/rust#159614 (debuginfo generation for unsafe binders) - rust-lang/rust#159647 (Remove `early_exit` closures) - rust-lang/rust#159656 (define a `Simd` type in `minicore`) - rust-lang/rust#156474 (Add paths for linked associated items) - rust-lang/rust#159211 (Fix debuginfo argument when invoking LLBC linker) - rust-lang/rust#159527 (Bring runtime symbols statics on par with foreign functions) - rust-lang/rust#159625 (Refactor is_opsem_inhabited) - rust-lang/rust#159629 (Add more splat rust-call regression tests) - rust-lang/rust#159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - rust-lang/rust#159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - rust-lang/rust#159663 (Add layout cycle hang regression test)

folkertdev · 2026-07-19T22:10:45Z

View all comments

r? @ghost

feel free to r+ once green

the `float-cmp` and `num-traits` libraries don't (yet) support f16. Turns out we didn't really need much from them, just the ulps check. I've adapted the ulps check from miri instead

relevant for the cranelift backend, possibly other cases/targets too

Fix pointer API to match what was stabilized

We can do swizzles for 24, 32, 48 and 64 byte vectors by stacking multiple TBL instructions. See https://godbolt.org/z/PE95nrqjj for a comparison of the generated assembly.

Optimize `swizzle_dyn` for AArch64 with N > 16

`From` impls were already provided for the normal AArch64 ACLE vector types, but not for the x2,x3,x4 tuples of ACLE vectors. Rectify that. Also provide impls for vectors of `f16`, as I noticed they were missing.

For symmetry with `Mask::first_set`

Add `Mask::last_set` method

…mpls Provide `From` impls for AArch64 ACLE tuple types.

Use `impl` restrictions over hand-sealed traits

Optimize `swizzle_dyn` for LoongArch64 with N is 16 or 32

run `f16` float tests

…nelift backend

…m-portable-simd-2026-07-20

rustbot · 2026-07-19T22:10:48Z

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

cc @calebzulawski, @programmerjake

rustbot · 2026-07-19T22:10:50Z

⚠️Warning⚠️

There are issue links (such as #123) in the commit messages of the following commits.
Please move them to the PR description, to avoid spamming the issues with references to the commit, and so this bot can automatically canonicalize them to avoid issues with subtree.
- 7d497cc
The following commits have merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.
You can start a rebase with the following commands:
```
$ # rebase
$ git pull --rebase https://github.com/rust-lang/rust.git main
$ git push --force-with-lease
```

folkertdev · 2026-07-19T22:14:02Z

This sync (specifically ignoring f16 tests) will help with rust-lang/rustc_codegen_cranelift#1675

rustbot · 2026-07-20T10:17:43Z

miri is developed in its own repository. If the Miri part of this change can be broken out, consider making this change to rust-lang/miri instead. However, if Miri needs adjusting for rustc changes, just ignore this message.

cc @rust-lang/miri

RalfJung · 2026-07-21T07:56:08Z

That's the test running with Miri's deliberately-imprecise float operations. But it's odd that it would start failing now. Probably the test is already latently buggy in main but this PR triggers the bad non-determinism.

The fix should be to make

rust/library/coretests/tests/num/floats.rs

Line 82 in 5a8cd23

constLOG_APPROX:Self = 1e-2;

bigger on Miri.

rustbot · 2026-07-21T10:59:54Z

Any special-casing of Miri in the standard library requires review.

cc @rust-lang/miri

folkertdev · 2026-07-21T11:00:05Z

@bors try jobs=x86_64-gnu-aux

…, r=<try> Sync from portable simd 2026 07 20 try-job: x86_64-gnu-aux

rust-bors · 2026-07-21T13:45:31Z

☀️ Try build successful (CI)
Build commit: b8f3ee8 (b8f3ee823c31d65751056ef71dd017ff752348b4)
Base parent: cde3f8a (cde3f8aee5a30928872e2438e3f18238a3fa306c)

RalfJung · 2026-07-21T13:52:18Z

@bors r=oli-obk

rust-bors · 2026-07-21T13:52:20Z

📌 Commit e547ba4 has been approved by oli-obk

It is now in the queue for this repository.

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 12 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159411 ([rustdoc] Correctly handle output options with --show-coverage) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

rust-bors · 2026-07-22T03:07:33Z

⌛ Testing commit e547ba4 with merge 1192fdc...

Workflow: https://github.com/rust-lang/rust/actions/runs/29887627022

@ghost

…, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

jhpratt · 2026-07-22T03:09:15Z

yielding to retrying the rollup

@bors yield

rust-bors · 2026-07-22T03:09:18Z

Auto build was cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/29887627022

The next pull request likely to be tested is #159697.

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

Rollup merge of #159582 - folkertdev:sync-from-portable-simd-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - rust-lang/rust#159582 (Sync from portable simd 2026 07 20) - rust-lang/rust#158890 (Fix splat v0 mangling) - rust-lang/rust#159614 (debuginfo generation for unsafe binders) - rust-lang/rust#159647 (Remove `early_exit` closures) - rust-lang/rust#159656 (define a `Simd` type in `minicore`) - rust-lang/rust#156474 (Add paths for linked associated items) - rust-lang/rust#159211 (Fix debuginfo argument when invoking LLBC linker) - rust-lang/rust#159527 (Bring runtime symbols statics on par with foreign functions) - rust-lang/rust#159625 (Refactor is_opsem_inhabited) - rust-lang/rust#159629 (Add more splat rust-call regression tests) - rust-lang/rust#159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - rust-lang/rust#159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - rust-lang/rust#159663 (Add layout cycle hang regression test)

folkertdev · 2026-07-19T22:10:45Z

View all comments

r? @ghost

feel free to r+ once green

the `float-cmp` and `num-traits` libraries don't (yet) support f16. Turns out we didn't really need much from them, just the ulps check. I've adapted the ulps check from miri instead

relevant for the cranelift backend, possibly other cases/targets too

Fix pointer API to match what was stabilized

We can do swizzles for 24, 32, 48 and 64 byte vectors by stacking multiple TBL instructions. See https://godbolt.org/z/PE95nrqjj for a comparison of the generated assembly.

Optimize `swizzle_dyn` for AArch64 with N > 16

`From` impls were already provided for the normal AArch64 ACLE vector types, but not for the x2,x3,x4 tuples of ACLE vectors. Rectify that. Also provide impls for vectors of `f16`, as I noticed they were missing.

For symmetry with `Mask::first_set`

Add `Mask::last_set` method

…mpls Provide `From` impls for AArch64 ACLE tuple types.

Use `impl` restrictions over hand-sealed traits

Optimize `swizzle_dyn` for LoongArch64 with N is 16 or 32

run `f16` float tests

…nelift backend

…m-portable-simd-2026-07-20

rustbot · 2026-07-19T22:10:48Z

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

cc @calebzulawski, @programmerjake

rustbot · 2026-07-19T22:10:50Z

⚠️Warning⚠️

There are issue links (such as #123) in the commit messages of the following commits.
Please move them to the PR description, to avoid spamming the issues with references to the commit, and so this bot can automatically canonicalize them to avoid issues with subtree.
- 7d497cc
The following commits have merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.
You can start a rebase with the following commands:
```
$ # rebase
$ git pull --rebase https://github.com/rust-lang/rust.git main
$ git push --force-with-lease
```

folkertdev · 2026-07-19T22:14:02Z

This sync (specifically ignoring f16 tests) will help with rust-lang/rustc_codegen_cranelift#1675

rustbot · 2026-07-20T10:17:43Z

miri is developed in its own repository. If the Miri part of this change can be broken out, consider making this change to rust-lang/miri instead. However, if Miri needs adjusting for rustc changes, just ignore this message.

cc @rust-lang/miri

RalfJung · 2026-07-21T07:56:08Z

That's the test running with Miri's deliberately-imprecise float operations. But it's odd that it would start failing now. Probably the test is already latently buggy in main but this PR triggers the bad non-determinism.

The fix should be to make

rust/library/coretests/tests/num/floats.rs

Line 82 in 5a8cd23

constLOG_APPROX:Self = 1e-2;

bigger on Miri.

rustbot · 2026-07-21T10:59:54Z

Any special-casing of Miri in the standard library requires review.

cc @rust-lang/miri

folkertdev · 2026-07-21T11:00:05Z

@bors try jobs=x86_64-gnu-aux

…, r=<try> Sync from portable simd 2026 07 20 try-job: x86_64-gnu-aux

rust-bors · 2026-07-21T13:45:31Z

☀️ Try build successful (CI)
Build commit: b8f3ee8 (b8f3ee823c31d65751056ef71dd017ff752348b4)
Base parent: cde3f8a (cde3f8aee5a30928872e2438e3f18238a3fa306c)

RalfJung · 2026-07-21T13:52:18Z

@bors r=oli-obk

rust-bors · 2026-07-21T13:52:20Z

📌 Commit e547ba4 has been approved by oli-obk

It is now in the queue for this repository.

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 12 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159411 ([rustdoc] Correctly handle output options with --show-coverage) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

rust-bors · 2026-07-22T03:07:33Z

⌛ Testing commit e547ba4 with merge 1192fdc...

Workflow: https://github.com/rust-lang/rust/actions/runs/29887627022

@ghost

…, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

jhpratt · 2026-07-22T03:09:15Z

yielding to retrying the rollup

@bors yield

rust-bors · 2026-07-22T03:09:18Z

Auto build was cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/29887627022

The next pull request likely to be tested is #159697.

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

Rollup merge of #159582 - folkertdev:sync-from-portable-simd-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - rust-lang/rust#159582 (Sync from portable simd 2026 07 20) - rust-lang/rust#158890 (Fix splat v0 mangling) - rust-lang/rust#159614 (debuginfo generation for unsafe binders) - rust-lang/rust#159647 (Remove `early_exit` closures) - rust-lang/rust#159656 (define a `Simd` type in `minicore`) - rust-lang/rust#156474 (Add paths for linked associated items) - rust-lang/rust#159211 (Fix debuginfo argument when invoking LLBC linker) - rust-lang/rust#159527 (Bring runtime symbols statics on par with foreign functions) - rust-lang/rust#159625 (Refactor is_opsem_inhabited) - rust-lang/rust#159629 (Add more splat rust-call regression tests) - rust-lang/rust#159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - rust-lang/rust#159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - rust-lang/rust#159663 (Add layout cycle hang regression test)

folkertdev · 2026-07-19T22:10:45Z

View all comments

r? @ghost

feel free to r+ once green

the `float-cmp` and `num-traits` libraries don't (yet) support f16. Turns out we didn't really need much from them, just the ulps check. I've adapted the ulps check from miri instead

relevant for the cranelift backend, possibly other cases/targets too

Fix pointer API to match what was stabilized

We can do swizzles for 24, 32, 48 and 64 byte vectors by stacking multiple TBL instructions. See https://godbolt.org/z/PE95nrqjj for a comparison of the generated assembly.

Optimize `swizzle_dyn` for AArch64 with N > 16

`From` impls were already provided for the normal AArch64 ACLE vector types, but not for the x2,x3,x4 tuples of ACLE vectors. Rectify that. Also provide impls for vectors of `f16`, as I noticed they were missing.

For symmetry with `Mask::first_set`

Add `Mask::last_set` method

…mpls Provide `From` impls for AArch64 ACLE tuple types.

Use `impl` restrictions over hand-sealed traits

Optimize `swizzle_dyn` for LoongArch64 with N is 16 or 32

run `f16` float tests

…nelift backend

…m-portable-simd-2026-07-20

rustbot · 2026-07-19T22:10:48Z

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

cc @calebzulawski, @programmerjake

rustbot · 2026-07-19T22:10:50Z

⚠️Warning⚠️

There are issue links (such as #123) in the commit messages of the following commits.
Please move them to the PR description, to avoid spamming the issues with references to the commit, and so this bot can automatically canonicalize them to avoid issues with subtree.
- 7d497cc
The following commits have merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.
You can start a rebase with the following commands:
```
$ # rebase
$ git pull --rebase https://github.com/rust-lang/rust.git main
$ git push --force-with-lease
```

folkertdev · 2026-07-19T22:14:02Z

This sync (specifically ignoring f16 tests) will help with rust-lang/rustc_codegen_cranelift#1675

rustbot · 2026-07-20T10:17:43Z

miri is developed in its own repository. If the Miri part of this change can be broken out, consider making this change to rust-lang/miri instead. However, if Miri needs adjusting for rustc changes, just ignore this message.

cc @rust-lang/miri

RalfJung · 2026-07-21T07:56:08Z

That's the test running with Miri's deliberately-imprecise float operations. But it's odd that it would start failing now. Probably the test is already latently buggy in main but this PR triggers the bad non-determinism.

The fix should be to make

rust/library/coretests/tests/num/floats.rs

Line 82 in 5a8cd23

constLOG_APPROX:Self = 1e-2;

bigger on Miri.

rustbot · 2026-07-21T10:59:54Z

Any special-casing of Miri in the standard library requires review.

cc @rust-lang/miri

folkertdev · 2026-07-21T11:00:05Z

@bors try jobs=x86_64-gnu-aux

…, r=<try> Sync from portable simd 2026 07 20 try-job: x86_64-gnu-aux

rust-bors · 2026-07-21T13:45:31Z

☀️ Try build successful (CI)
Build commit: b8f3ee8 (b8f3ee823c31d65751056ef71dd017ff752348b4)
Base parent: cde3f8a (cde3f8aee5a30928872e2438e3f18238a3fa306c)

RalfJung · 2026-07-21T13:52:18Z

@bors r=oli-obk

rust-bors · 2026-07-21T13:52:20Z

📌 Commit e547ba4 has been approved by oli-obk

It is now in the queue for this repository.

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 12 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159411 ([rustdoc] Correctly handle output options with --show-coverage) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

rust-bors · 2026-07-22T03:07:33Z

⌛ Testing commit e547ba4 with merge 1192fdc...

Workflow: https://github.com/rust-lang/rust/actions/runs/29887627022

@ghost

…, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

jhpratt · 2026-07-22T03:09:15Z

yielding to retrying the rollup

@bors yield

rust-bors · 2026-07-22T03:09:18Z

Auto build was cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/29887627022

The next pull request likely to be tested is #159697.

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

Rollup merge of #159582 - folkertdev:sync-from-portable-simd-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - rust-lang/rust#159582 (Sync from portable simd 2026 07 20) - rust-lang/rust#158890 (Fix splat v0 mangling) - rust-lang/rust#159614 (debuginfo generation for unsafe binders) - rust-lang/rust#159647 (Remove `early_exit` closures) - rust-lang/rust#159656 (define a `Simd` type in `minicore`) - rust-lang/rust#156474 (Add paths for linked associated items) - rust-lang/rust#159211 (Fix debuginfo argument when invoking LLBC linker) - rust-lang/rust#159527 (Bring runtime symbols statics on par with foreign functions) - rust-lang/rust#159625 (Refactor is_opsem_inhabited) - rust-lang/rust#159629 (Add more splat rust-call regression tests) - rust-lang/rust#159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - rust-lang/rust#159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - rust-lang/rust#159663 (Add layout cycle hang regression test)

folkertdev · 2026-07-19T22:10:45Z

View all comments

r? @ghost

feel free to r+ once green

the `float-cmp` and `num-traits` libraries don't (yet) support f16. Turns out we didn't really need much from them, just the ulps check. I've adapted the ulps check from miri instead

relevant for the cranelift backend, possibly other cases/targets too

Fix pointer API to match what was stabilized

We can do swizzles for 24, 32, 48 and 64 byte vectors by stacking multiple TBL instructions. See https://godbolt.org/z/PE95nrqjj for a comparison of the generated assembly.

Optimize `swizzle_dyn` for AArch64 with N > 16

`From` impls were already provided for the normal AArch64 ACLE vector types, but not for the x2,x3,x4 tuples of ACLE vectors. Rectify that. Also provide impls for vectors of `f16`, as I noticed they were missing.

For symmetry with `Mask::first_set`

Add `Mask::last_set` method

…mpls Provide `From` impls for AArch64 ACLE tuple types.

Use `impl` restrictions over hand-sealed traits

Optimize `swizzle_dyn` for LoongArch64 with N is 16 or 32

run `f16` float tests

…nelift backend

…m-portable-simd-2026-07-20

rustbot · 2026-07-19T22:10:48Z

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

cc @calebzulawski, @programmerjake

rustbot · 2026-07-19T22:10:50Z

⚠️Warning⚠️

There are issue links (such as #123) in the commit messages of the following commits.
Please move them to the PR description, to avoid spamming the issues with references to the commit, and so this bot can automatically canonicalize them to avoid issues with subtree.
- 7d497cc
The following commits have merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.
You can start a rebase with the following commands:
```
$ # rebase
$ git pull --rebase https://github.com/rust-lang/rust.git main
$ git push --force-with-lease
```

folkertdev · 2026-07-19T22:14:02Z

This sync (specifically ignoring f16 tests) will help with rust-lang/rustc_codegen_cranelift#1675

rustbot · 2026-07-20T10:17:43Z

miri is developed in its own repository. If the Miri part of this change can be broken out, consider making this change to rust-lang/miri instead. However, if Miri needs adjusting for rustc changes, just ignore this message.

cc @rust-lang/miri

RalfJung · 2026-07-21T07:56:08Z

That's the test running with Miri's deliberately-imprecise float operations. But it's odd that it would start failing now. Probably the test is already latently buggy in main but this PR triggers the bad non-determinism.

The fix should be to make

rust/library/coretests/tests/num/floats.rs

Line 82 in 5a8cd23

constLOG_APPROX:Self = 1e-2;

bigger on Miri.

rustbot · 2026-07-21T10:59:54Z

Any special-casing of Miri in the standard library requires review.

cc @rust-lang/miri

folkertdev · 2026-07-21T11:00:05Z

@bors try jobs=x86_64-gnu-aux

…, r=<try> Sync from portable simd 2026 07 20 try-job: x86_64-gnu-aux

rust-bors · 2026-07-21T13:45:31Z

☀️ Try build successful (CI)
Build commit: b8f3ee8 (b8f3ee823c31d65751056ef71dd017ff752348b4)
Base parent: cde3f8a (cde3f8aee5a30928872e2438e3f18238a3fa306c)

RalfJung · 2026-07-21T13:52:18Z

@bors r=oli-obk

rust-bors · 2026-07-21T13:52:20Z

📌 Commit e547ba4 has been approved by oli-obk

It is now in the queue for this repository.

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 12 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159411 ([rustdoc] Correctly handle output options with --show-coverage) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

rust-bors · 2026-07-22T03:07:33Z

⌛ Testing commit e547ba4 with merge 1192fdc...

Workflow: https://github.com/rust-lang/rust/actions/runs/29887627022

@ghost

…, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

jhpratt · 2026-07-22T03:09:15Z

yielding to retrying the rollup

@bors yield

rust-bors · 2026-07-22T03:09:18Z

Auto build was cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/29887627022

The next pull request likely to be tested is #159697.

Rollup of 13 pull requests Successful merges: - #159582 (Sync from portable simd 2026 07 20) - #158890 (Fix splat v0 mangling) - #159614 (debuginfo generation for unsafe binders) - #159647 (Remove `early_exit` closures) - #159656 (define a `Simd` type in `minicore`) - #156474 (Add paths for linked associated items) - #159211 (Fix debuginfo argument when invoking LLBC linker) - #159527 (Bring runtime symbols statics on par with foreign functions) - #159625 (Refactor is_opsem_inhabited) - #159629 (Add more splat rust-call regression tests) - #159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - #159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - #159663 (Add layout cycle hang regression test)

@ghost

Rollup merge of #159582 - folkertdev:sync-from-portable-simd-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

Rollup of 13 pull requests Successful merges: - rust-lang/rust#159582 (Sync from portable simd 2026 07 20) - rust-lang/rust#158890 (Fix splat v0 mangling) - rust-lang/rust#159614 (debuginfo generation for unsafe binders) - rust-lang/rust#159647 (Remove `early_exit` closures) - rust-lang/rust#159656 (define a `Simd` type in `minicore`) - rust-lang/rust#156474 (Add paths for linked associated items) - rust-lang/rust#159211 (Fix debuginfo argument when invoking LLBC linker) - rust-lang/rust#159527 (Bring runtime symbols statics on par with foreign functions) - rust-lang/rust#159625 (Refactor is_opsem_inhabited) - rust-lang/rust#159629 (Add more splat rust-call regression tests) - rust-lang/rust#159652 (Remove `cfg(not(no_global_oom_handling))` from the `Drop` impl of `UniqueArcUninit`) - rust-lang/rust#159657 (Remove the blanket `#![cfg_attr(test, allow(unused))]` from bootstrap ) - rust-lang/rust#159663 (Add layout cycle hang regression test)

folkertdevand others added 17 commits April 12, 2026 13:26

implement our own ulps check to test f16
eb7cb89
the `float-cmp` and `num-traits` libraries don't (yet) support f16. Turns out we didn't really need much from them, just the ulps check. I've adapted the ulps check from miri instead

disable f16 tests when not target_has_reliable_f16_math
f40da91
relevant for the cranelift backend, possibly other cases/targets too

Fix pointer API to match what was stabilized
c4f3110

Merge pull requestrust-lang#526from rust-lang/update-pointer-api
94a3ba2
Fix pointer API to match what was stabilized

Optimize swizzle_dyn for AArch64 with N > 16
beafe83
We can do swizzles for 24, 32, 48 and 64 byte vectors by stacking multiple TBL instructions. See https://godbolt.org/z/PE95nrqjj for a comparison of the generated assembly.

Merge pull requestrust-lang#528from Kmeakin/km/aarch64-dyn-swizzle
be090a7
Optimize `swizzle_dyn` for AArch64 with N > 16

Provide From impls for AArch64 ACLE tuple types.
b16ee62
`From` impls were already provided for the normal AArch64 ACLE vector types, but not for the x2,x3,x4 tuples of ACLE vectors. Rectify that. Also provide impls for vectors of `f16`, as I noticed they were missing.

Use impl restrictions over hand-sealed traits
61ae55e

Add Mask::last_set method
ae33abe
For symmetry with `Mask::first_set`

Merge pull requestrust-lang#532from Kmeakin/km/simd-last-set
a27ae1d
Add `Mask::last_set` method

Merge pull requestrust-lang#530from Kmeakin/km/aarch64-tuple-from-i…
8e3bfb0
…mpls Provide `From` impls for AArch64 ACLE tuple types.

Merge pull requestrust-lang#529from jhpratt/master
d7a525f
Use `impl` restrictions over hand-sealed traits

Optimize swizzle_dyn for LoongArch64 with N is 16 or 32
30bdfe3

Merge pull requestrust-lang#533from heiher/swizzle-dyn-loong64
44a03e6
Optimize `swizzle_dyn` for LoongArch64 with N is 16 or 32

Merge pull requestrust-lang#518from folkertdev/test-float-f16
5b7c840
run `f16` float tests

Merge ofrust-lang/portable-simd#520: disablef16tests for the cra…
7d497cc
…nelift backend

Merge commit '7d497cca160ae6062acc1a2db838667f83c0b58e' into sync-fro…
b010737
…m-portable-simd-2026-07-20

rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 19, 2026

rustbot added has-merge-commits PR has merge commits, merge with caution. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 19, 2026

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folkertdev added 2 commits July 20, 2026 10:49

fix feature gate
e09b887

remove now-dead Sealed trait
b045903

rustbot added the T-libs Relevant to the library team, which will review and decide on the PR/issue. label Jul 20, 2026

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relax f16LOG_APPROX when running tests under Miri
e547ba4

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rust-borsBot pushed a commit that referenced this pull request Jul 21, 2026
Auto merge of#159582- folkertdev:sync-from-portable-simd-2026-07-20…
b8f3ee8
…, r=<try> Sync from portable simd 2026 07 20 try-job: x86_64-gnu-aux

rust-borsBot 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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 21, 2026

JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request Jul 21, 2026
Rollup merge ofrust-lang#159582- folkertdev:sync-from-portable-simd…
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…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

JonathanBrouwer mentioned this pull request Jul 21, 2026
Rollup of 10 pull requests #159684
Closed

GuillaumeGomez added a commit to GuillaumeGomez/rust that referenced this pull request Jul 21, 2026
Rollup merge ofrust-lang#159582- folkertdev:sync-from-portable-simd…
0d1e050
…-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

GuillaumeGomez mentioned this pull request Jul 21, 2026
Rollup of 12 pull requests #159693
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jhpratt added a commit to jhpratt/rust that referenced this pull request Jul 22, 2026
Rollup merge ofrust-lang#159582- folkertdev:sync-from-portable-simd…
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This was referenced Jul 22, 2026
Rollup of 13 pull requests #159696
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Rollup of 13 pull requests #159697
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rust-borsBot pushed a commit that referenced this pull request Jul 22, 2026
Auto merge of#159582- folkertdev:sync-from-portable-simd-2026-07-20…
1192fdc
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rust-borsBot merged commit 1b34ade into rust-lang:mainJul 22, 2026
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rust-timer added a commit that referenced this pull request Jul 22, 2026
Unrolled build for#159582
65cef57
Rollup merge of #159582 - folkertdev:sync-from-portable-simd-2026-07-20, r=oli-obk Sync from portable simd 2026 07 20 r? @ghost feel free to `r+` once green

rustbot added this to the 1.99.0 milestone Jul 22, 2026

folkertdev mentioned this pull request Jul 23, 2026
remove the portable simd f16 patch rust-lang/rustc_codegen_cranelift#1675
Merged