cg_llvm: scalable vectors with `simd_cast` and `simd_select` by davidtwco · Pull Request #155106 · rust-lang/rust

davidtwco · 2026-04-10T14:56:07Z

Previously sve_cast's implementation was abstracted to power both sve_cast and simd_cast which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another simd_* intrinsic, sve_cast is removed and simd_cast is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with simd_select. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-10T14:56:11Z

Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter
gets adapted for the changes, if necessary.

cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr

rustbot · 2026-04-10T14:56:13Z

r? @dingxiangfei2009

rustbot has assigned @dingxiangfei2009.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

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Owners of files modified in this PR: compiler
compiler expanded to 69 candidates
Random selection from 11 candidates

Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-13T11:25:08Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

Amanieu · 2026-04-13T11:59:13Z

LGTM. I particularly like this since simd_cast is now also usable for RVV in the future.

@bors r+

rust-bors · 2026-04-13T11:59:16Z

📌 Commit 62ffc89 has been approved by Amanieu

It is now in the queue for this repository.

…uwer Rollup of 10 pull requests Successful merges: - #155227 (`rust-analyzer` subtree update) - #153335 (Add #![unstable_removed(..)] attribute to track removed features) - #154932 (Handle RTN projections in assoc type restriction diagnostics) - #155096 (delegation: support proper interaction of user-specified args and impl Traits) - #155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - #155140 (add regression test for OpenOptionsExt downstream compat) - #155182 (Make the expansion of guard metavars begin guard non-terminals) - #155226 (delegation: revert execution of hir_crate_items before delayed lowering) - #153997 (Use closures more consistently in `dep_graph.rs`.) - #155003 (update thin-vec)

Rollup merge of #155106 - davidtwco:scalable-vector-more-simd-intrinsics, r=Amanieu cg_llvm: scalable vectors with `simd_cast` and `simd_select` Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics. Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

…uwer Rollup of 10 pull requests Successful merges: - rust-lang/rust#155227 (`rust-analyzer` subtree update) - rust-lang/rust#153335 (Add #![unstable_removed(..)] attribute to track removed features) - rust-lang/rust#154932 (Handle RTN projections in assoc type restriction diagnostics) - rust-lang/rust#155096 (delegation: support proper interaction of user-specified args and impl Traits) - rust-lang/rust#155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - rust-lang/rust#155140 (add regression test for OpenOptionsExt downstream compat) - rust-lang/rust#155182 (Make the expansion of guard metavars begin guard non-terminals) - rust-lang/rust#155226 (delegation: revert execution of hir_crate_items before delayed lowering) - rust-lang/rust#153997 (Use closures more consistently in `dep_graph.rs`.) - rust-lang/rust#155003 (update thin-vec)

davidtwco · 2026-04-10T14:56:07Z

Previously sve_cast's implementation was abstracted to power both sve_cast and simd_cast which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another simd_* intrinsic, sve_cast is removed and simd_cast is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with simd_select. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-10T14:56:11Z

Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter
gets adapted for the changes, if necessary.

cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr

rustbot · 2026-04-10T14:56:13Z

r? @dingxiangfei2009

rustbot has assigned @dingxiangfei2009.
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

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: compiler
compiler expanded to 69 candidates
Random selection from 11 candidates

Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-13T11:25:08Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

Amanieu · 2026-04-13T11:59:13Z

LGTM. I particularly like this since simd_cast is now also usable for RVV in the future.

@bors r+

rust-bors · 2026-04-13T11:59:16Z

📌 Commit 62ffc89 has been approved by Amanieu

It is now in the queue for this repository.

…uwer Rollup of 10 pull requests Successful merges: - #155227 (`rust-analyzer` subtree update) - #153335 (Add #![unstable_removed(..)] attribute to track removed features) - #154932 (Handle RTN projections in assoc type restriction diagnostics) - #155096 (delegation: support proper interaction of user-specified args and impl Traits) - #155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - #155140 (add regression test for OpenOptionsExt downstream compat) - #155182 (Make the expansion of guard metavars begin guard non-terminals) - #155226 (delegation: revert execution of hir_crate_items before delayed lowering) - #153997 (Use closures more consistently in `dep_graph.rs`.) - #155003 (update thin-vec)

Rollup merge of #155106 - davidtwco:scalable-vector-more-simd-intrinsics, r=Amanieu cg_llvm: scalable vectors with `simd_cast` and `simd_select` Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics. Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

…uwer Rollup of 10 pull requests Successful merges: - rust-lang/rust#155227 (`rust-analyzer` subtree update) - rust-lang/rust#153335 (Add #![unstable_removed(..)] attribute to track removed features) - rust-lang/rust#154932 (Handle RTN projections in assoc type restriction diagnostics) - rust-lang/rust#155096 (delegation: support proper interaction of user-specified args and impl Traits) - rust-lang/rust#155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - rust-lang/rust#155140 (add regression test for OpenOptionsExt downstream compat) - rust-lang/rust#155182 (Make the expansion of guard metavars begin guard non-terminals) - rust-lang/rust#155226 (delegation: revert execution of hir_crate_items before delayed lowering) - rust-lang/rust#153997 (Use closures more consistently in `dep_graph.rs`.) - rust-lang/rust#155003 (update thin-vec)

davidtwco · 2026-04-10T14:56:07Z

Previously sve_cast's implementation was abstracted to power both sve_cast and simd_cast which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another simd_* intrinsic, sve_cast is removed and simd_cast is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with simd_select. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-10T14:56:11Z

Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter
gets adapted for the changes, if necessary.

cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr

rustbot · 2026-04-10T14:56:13Z

r? @dingxiangfei2009

rustbot has assigned @dingxiangfei2009.
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

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: compiler
compiler expanded to 69 candidates
Random selection from 11 candidates

Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-13T11:25:08Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

Amanieu · 2026-04-13T11:59:13Z

LGTM. I particularly like this since simd_cast is now also usable for RVV in the future.

@bors r+

rust-bors · 2026-04-13T11:59:16Z

📌 Commit 62ffc89 has been approved by Amanieu

It is now in the queue for this repository.

…uwer Rollup of 10 pull requests Successful merges: - #155227 (`rust-analyzer` subtree update) - #153335 (Add #![unstable_removed(..)] attribute to track removed features) - #154932 (Handle RTN projections in assoc type restriction diagnostics) - #155096 (delegation: support proper interaction of user-specified args and impl Traits) - #155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - #155140 (add regression test for OpenOptionsExt downstream compat) - #155182 (Make the expansion of guard metavars begin guard non-terminals) - #155226 (delegation: revert execution of hir_crate_items before delayed lowering) - #153997 (Use closures more consistently in `dep_graph.rs`.) - #155003 (update thin-vec)

Rollup merge of #155106 - davidtwco:scalable-vector-more-simd-intrinsics, r=Amanieu cg_llvm: scalable vectors with `simd_cast` and `simd_select` Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics. Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

…uwer Rollup of 10 pull requests Successful merges: - rust-lang/rust#155227 (`rust-analyzer` subtree update) - rust-lang/rust#153335 (Add #![unstable_removed(..)] attribute to track removed features) - rust-lang/rust#154932 (Handle RTN projections in assoc type restriction diagnostics) - rust-lang/rust#155096 (delegation: support proper interaction of user-specified args and impl Traits) - rust-lang/rust#155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - rust-lang/rust#155140 (add regression test for OpenOptionsExt downstream compat) - rust-lang/rust#155182 (Make the expansion of guard metavars begin guard non-terminals) - rust-lang/rust#155226 (delegation: revert execution of hir_crate_items before delayed lowering) - rust-lang/rust#153997 (Use closures more consistently in `dep_graph.rs`.) - rust-lang/rust#155003 (update thin-vec)

davidtwco · 2026-04-10T14:56:07Z

Previously sve_cast's implementation was abstracted to power both sve_cast and simd_cast which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another simd_* intrinsic, sve_cast is removed and simd_cast is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with simd_select. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-10T14:56:11Z

Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter
gets adapted for the changes, if necessary.

cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr

rustbot · 2026-04-10T14:56:13Z

r? @dingxiangfei2009

rustbot has assigned @dingxiangfei2009.
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

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: compiler
compiler expanded to 69 candidates
Random selection from 11 candidates

Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-13T11:25:08Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

Amanieu · 2026-04-13T11:59:13Z

LGTM. I particularly like this since simd_cast is now also usable for RVV in the future.

@bors r+

rust-bors · 2026-04-13T11:59:16Z

📌 Commit 62ffc89 has been approved by Amanieu

It is now in the queue for this repository.

…uwer Rollup of 10 pull requests Successful merges: - #155227 (`rust-analyzer` subtree update) - #153335 (Add #![unstable_removed(..)] attribute to track removed features) - #154932 (Handle RTN projections in assoc type restriction diagnostics) - #155096 (delegation: support proper interaction of user-specified args and impl Traits) - #155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - #155140 (add regression test for OpenOptionsExt downstream compat) - #155182 (Make the expansion of guard metavars begin guard non-terminals) - #155226 (delegation: revert execution of hir_crate_items before delayed lowering) - #153997 (Use closures more consistently in `dep_graph.rs`.) - #155003 (update thin-vec)

Rollup merge of #155106 - davidtwco:scalable-vector-more-simd-intrinsics, r=Amanieu cg_llvm: scalable vectors with `simd_cast` and `simd_select` Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics. Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

…uwer Rollup of 10 pull requests Successful merges: - rust-lang/rust#155227 (`rust-analyzer` subtree update) - rust-lang/rust#153335 (Add #![unstable_removed(..)] attribute to track removed features) - rust-lang/rust#154932 (Handle RTN projections in assoc type restriction diagnostics) - rust-lang/rust#155096 (delegation: support proper interaction of user-specified args and impl Traits) - rust-lang/rust#155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - rust-lang/rust#155140 (add regression test for OpenOptionsExt downstream compat) - rust-lang/rust#155182 (Make the expansion of guard metavars begin guard non-terminals) - rust-lang/rust#155226 (delegation: revert execution of hir_crate_items before delayed lowering) - rust-lang/rust#153997 (Use closures more consistently in `dep_graph.rs`.) - rust-lang/rust#155003 (update thin-vec)

davidtwco · 2026-04-10T14:56:07Z

Previously sve_cast's implementation was abstracted to power both sve_cast and simd_cast which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another simd_* intrinsic, sve_cast is removed and simd_cast is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with simd_select. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-10T14:56:11Z

Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter
gets adapted for the changes, if necessary.

cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr

rustbot · 2026-04-10T14:56:13Z

r? @dingxiangfei2009

rustbot has assigned @dingxiangfei2009.
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

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: compiler
compiler expanded to 69 candidates
Random selection from 11 candidates

Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-13T11:25:08Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

Amanieu · 2026-04-13T11:59:13Z

LGTM. I particularly like this since simd_cast is now also usable for RVV in the future.

@bors r+

rust-bors · 2026-04-13T11:59:16Z

📌 Commit 62ffc89 has been approved by Amanieu

It is now in the queue for this repository.

…uwer Rollup of 10 pull requests Successful merges: - #155227 (`rust-analyzer` subtree update) - #153335 (Add #![unstable_removed(..)] attribute to track removed features) - #154932 (Handle RTN projections in assoc type restriction diagnostics) - #155096 (delegation: support proper interaction of user-specified args and impl Traits) - #155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - #155140 (add regression test for OpenOptionsExt downstream compat) - #155182 (Make the expansion of guard metavars begin guard non-terminals) - #155226 (delegation: revert execution of hir_crate_items before delayed lowering) - #153997 (Use closures more consistently in `dep_graph.rs`.) - #155003 (update thin-vec)

Rollup merge of #155106 - davidtwco:scalable-vector-more-simd-intrinsics, r=Amanieu cg_llvm: scalable vectors with `simd_cast` and `simd_select` Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics. Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

…uwer Rollup of 10 pull requests Successful merges: - rust-lang/rust#155227 (`rust-analyzer` subtree update) - rust-lang/rust#153335 (Add #![unstable_removed(..)] attribute to track removed features) - rust-lang/rust#154932 (Handle RTN projections in assoc type restriction diagnostics) - rust-lang/rust#155096 (delegation: support proper interaction of user-specified args and impl Traits) - rust-lang/rust#155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - rust-lang/rust#155140 (add regression test for OpenOptionsExt downstream compat) - rust-lang/rust#155182 (Make the expansion of guard metavars begin guard non-terminals) - rust-lang/rust#155226 (delegation: revert execution of hir_crate_items before delayed lowering) - rust-lang/rust#153997 (Use closures more consistently in `dep_graph.rs`.) - rust-lang/rust#155003 (update thin-vec)

davidtwco · 2026-04-10T14:56:07Z

Previously sve_cast's implementation was abstracted to power both sve_cast and simd_cast which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another simd_* intrinsic, sve_cast is removed and simd_cast is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with simd_select. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-10T14:56:11Z

Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter
gets adapted for the changes, if necessary.

cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr

rustbot · 2026-04-10T14:56:13Z

r? @dingxiangfei2009

rustbot has assigned @dingxiangfei2009.
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

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: compiler
compiler expanded to 69 candidates
Random selection from 11 candidates

Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-13T11:25:08Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

Amanieu · 2026-04-13T11:59:13Z

LGTM. I particularly like this since simd_cast is now also usable for RVV in the future.

@bors r+

rust-bors · 2026-04-13T11:59:16Z

📌 Commit 62ffc89 has been approved by Amanieu

It is now in the queue for this repository.

…uwer Rollup of 10 pull requests Successful merges: - #155227 (`rust-analyzer` subtree update) - #153335 (Add #![unstable_removed(..)] attribute to track removed features) - #154932 (Handle RTN projections in assoc type restriction diagnostics) - #155096 (delegation: support proper interaction of user-specified args and impl Traits) - #155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - #155140 (add regression test for OpenOptionsExt downstream compat) - #155182 (Make the expansion of guard metavars begin guard non-terminals) - #155226 (delegation: revert execution of hir_crate_items before delayed lowering) - #153997 (Use closures more consistently in `dep_graph.rs`.) - #155003 (update thin-vec)

Rollup merge of #155106 - davidtwco:scalable-vector-more-simd-intrinsics, r=Amanieu cg_llvm: scalable vectors with `simd_cast` and `simd_select` Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics. Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

…uwer Rollup of 10 pull requests Successful merges: - rust-lang/rust#155227 (`rust-analyzer` subtree update) - rust-lang/rust#153335 (Add #![unstable_removed(..)] attribute to track removed features) - rust-lang/rust#154932 (Handle RTN projections in assoc type restriction diagnostics) - rust-lang/rust#155096 (delegation: support proper interaction of user-specified args and impl Traits) - rust-lang/rust#155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - rust-lang/rust#155140 (add regression test for OpenOptionsExt downstream compat) - rust-lang/rust#155182 (Make the expansion of guard metavars begin guard non-terminals) - rust-lang/rust#155226 (delegation: revert execution of hir_crate_items before delayed lowering) - rust-lang/rust#153997 (Use closures more consistently in `dep_graph.rs`.) - rust-lang/rust#155003 (update thin-vec)

davidtwco · 2026-04-10T14:56:07Z

Previously sve_cast's implementation was abstracted to power both sve_cast and simd_cast which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another simd_* intrinsic, sve_cast is removed and simd_cast is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with simd_select. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-10T14:56:11Z

Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter
gets adapted for the changes, if necessary.

cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr

rustbot · 2026-04-10T14:56:13Z

r? @dingxiangfei2009

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Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-13T11:25:08Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

Amanieu · 2026-04-13T11:59:13Z

LGTM. I particularly like this since simd_cast is now also usable for RVV in the future.

@bors r+

rust-bors · 2026-04-13T11:59:16Z

📌 Commit 62ffc89 has been approved by Amanieu

It is now in the queue for this repository.

…uwer Rollup of 10 pull requests Successful merges: - #155227 (`rust-analyzer` subtree update) - #153335 (Add #![unstable_removed(..)] attribute to track removed features) - #154932 (Handle RTN projections in assoc type restriction diagnostics) - #155096 (delegation: support proper interaction of user-specified args and impl Traits) - #155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - #155140 (add regression test for OpenOptionsExt downstream compat) - #155182 (Make the expansion of guard metavars begin guard non-terminals) - #155226 (delegation: revert execution of hir_crate_items before delayed lowering) - #153997 (Use closures more consistently in `dep_graph.rs`.) - #155003 (update thin-vec)

Rollup merge of #155106 - davidtwco:scalable-vector-more-simd-intrinsics, r=Amanieu cg_llvm: scalable vectors with `simd_cast` and `simd_select` Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics. Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

…uwer Rollup of 10 pull requests Successful merges: - rust-lang/rust#155227 (`rust-analyzer` subtree update) - rust-lang/rust#153335 (Add #![unstable_removed(..)] attribute to track removed features) - rust-lang/rust#154932 (Handle RTN projections in assoc type restriction diagnostics) - rust-lang/rust#155096 (delegation: support proper interaction of user-specified args and impl Traits) - rust-lang/rust#155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - rust-lang/rust#155140 (add regression test for OpenOptionsExt downstream compat) - rust-lang/rust#155182 (Make the expansion of guard metavars begin guard non-terminals) - rust-lang/rust#155226 (delegation: revert execution of hir_crate_items before delayed lowering) - rust-lang/rust#153997 (Use closures more consistently in `dep_graph.rs`.) - rust-lang/rust#155003 (update thin-vec)

davidtwco · 2026-04-10T14:56:07Z

Previously sve_cast's implementation was abstracted to power both sve_cast and simd_cast which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another simd_* intrinsic, sve_cast is removed and simd_cast is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with simd_select. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-10T14:56:11Z

Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter
gets adapted for the changes, if necessary.

cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr

rustbot · 2026-04-10T14:56:13Z

r? @dingxiangfei2009

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

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Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics.

Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

rustbot · 2026-04-13T11:25:08Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

Amanieu · 2026-04-13T11:59:13Z

LGTM. I particularly like this since simd_cast is now also usable for RVV in the future.

@bors r+

rust-bors · 2026-04-13T11:59:16Z

📌 Commit 62ffc89 has been approved by Amanieu

It is now in the queue for this repository.

…uwer Rollup of 10 pull requests Successful merges: - #155227 (`rust-analyzer` subtree update) - #153335 (Add #![unstable_removed(..)] attribute to track removed features) - #154932 (Handle RTN projections in assoc type restriction diagnostics) - #155096 (delegation: support proper interaction of user-specified args and impl Traits) - #155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - #155140 (add regression test for OpenOptionsExt downstream compat) - #155182 (Make the expansion of guard metavars begin guard non-terminals) - #155226 (delegation: revert execution of hir_crate_items before delayed lowering) - #153997 (Use closures more consistently in `dep_graph.rs`.) - #155003 (update thin-vec)

Rollup merge of #155106 - davidtwco:scalable-vector-more-simd-intrinsics, r=Amanieu cg_llvm: scalable vectors with `simd_cast` and `simd_select` Previously `sve_cast`'s implementation was abstracted to power both `sve_cast` and `simd_cast` which supported scalable and non-scalable vectors respectively. In anticipation of having to do this for another `simd_*` intrinsic, `sve_cast` is removed and `simd_cast` is changed to accept both scalable and non-scalable intrinsics, an approach that will scale better to the other intrinsics. Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

…uwer Rollup of 10 pull requests Successful merges: - rust-lang/rust#155227 (`rust-analyzer` subtree update) - rust-lang/rust#153335 (Add #![unstable_removed(..)] attribute to track removed features) - rust-lang/rust#154932 (Handle RTN projections in assoc type restriction diagnostics) - rust-lang/rust#155096 (delegation: support proper interaction of user-specified args and impl Traits) - rust-lang/rust#155106 (cg_llvm: scalable vectors with `simd_cast` and `simd_select`) - rust-lang/rust#155140 (add regression test for OpenOptionsExt downstream compat) - rust-lang/rust#155182 (Make the expansion of guard metavars begin guard non-terminals) - rust-lang/rust#155226 (delegation: revert execution of hir_crate_items before delayed lowering) - rust-lang/rust#153997 (Use closures more consistently in `dep_graph.rs`.) - rust-lang/rust#155003 (update thin-vec)

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Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

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Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

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cg_llvm: scalable vectors with simd_select
62ffc89
Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

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Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

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Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

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Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

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62ffc89
Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

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cg_llvm: scalable vectors with simd_select
62ffc89
Building on the previous change, support scalable vectors with `simd_select`. Previous patches already landed the necessary changes in the implementation of this intrinsic, but didn't allow scalable vector arguments to be passed in.

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