Port the remaining SIMD intrinsics to const-eval by sayantn · Pull Request #147520 · rust-lang/rust

sayantn · 2025-10-09T11:43:38Z

successor to #146568, this refactors some implementations and ports the implementation of simd_fma and simd_relaxed_fmato rustc_const_eval

Also adds some remaining f16/f128 support in these intrinsics

r? @RalfJung

rustbot · 2025-10-09T11:43:42Z

Some changes occurred to the CTFE / Miri interpreter

cc @rust-lang/miri

The Miri subtree was changed

cc @rust-lang/miri

Some changes occurred to the CTFE machinery

cc @RalfJung, @oli-obk, @lcnr

sayantn · 2025-10-09T11:50:32Z

In a similar fashion to #146568, I have not made the signatures const. If this gets merged quickly enough, I will just add these to #147521, otherwise new PR it is

RalfJung

Thanks! Here are some first comments.

All of the new intrinsics Miri supports with this will also need Miri tests.

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compiler/rustc_const_eval/src/interpret/intrinsics/simd.rs

compiler/rustc_const_eval/src/interpret/intrinsics.rs

RalfJung · 2025-10-09T15:27:35Z

successor to #146568, this refactors some implementations and implements the following SIMD intrinsics in const-eval

Please update the PR description: This doesn't actually add anything in const-eval, it adds it to the interpreter and then only exposes this in Miri.

compiler/rustc_const_eval/src/interpret/intrinsics/simd.rs

RalfJung

Thanks!
Still missing tests for the new f16/f128 support.

View changes since this review

compiler/rustc_const_eval/src/interpret/intrinsics.rs

src/tools/miri/src/intrinsics/simd.rs

sayantn · 2025-10-10T16:38:44Z

Do we really need f16/f128 tests? It's painful to add them because portable_simd doesn't implement SimdElement for f16 and f128, so we have to roll our own repr_simd types

RalfJung · 2025-10-10T20:12:32Z

Why do we add f16/f128 support if portable_simd can't even use it?

tests/pass/intrinsics/portable-simd.rs already declares two custom repr(simd) types. That only takes a few lines of code. Declaring two more shouldn't be so bad. We only need smoke tests, but I'd rather not have entirely dead codepaths here.

sayantn · 2025-10-10T20:24:01Z

I am adding them mostly for completeness sake, but stdarch will need simd_fma with f16.

Declaring two more shouldn't be so bad.

Ok I will add 👍

sayantn · 2025-10-10T22:30:43Z

@rustbot ready

added tests for f16 and f128 (just copied f32 and f64 tests)

RalfJung · 2025-10-11T10:46:47Z

src/tools/miri/tests/pass/intrinsics/portable-simd.rs

 #[rustc_nounwind]
 pub unsafe fn simd_shuffle_const_generic<T, U, const IDX: &'static [u32]>(x: T, y: T) -> U;

+pub fn simd_ops_f16() {


Your new functions aren't actually being called, but you made them pub which suppresses the warning...

Oh sorry, my mistake

Please remove all these pub. I think we have enough evidence to consider them dangerous. :)

src/tools/miri/tests/pass/intrinsics/portable-simd.rs

RalfJung · 2025-10-11T12:22:47Z

@rustbot author

rustbot · 2025-10-11T12:22:51Z

Reminder, once the PR becomes ready for a review, use @rustbot ready.

bors · 2025-10-13T23:43:27Z

☔ The latest upstream changes (presumably #147640) made this pull request unmergeable. Please resolve the merge conflicts.

compiler/rustc_const_eval/src/interpret/intrinsics/simd.rs

RalfJung

Just minor nits.

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compiler/rustc_const_eval/src/interpret/intrinsics.rs

RalfJung · 2025-11-03T16:11:22Z

Thanks!
@bors r+

bors · 2025-11-03T16:11:26Z

📌 Commit 0681bae has been approved by RalfJung

It is now in the queue for this repository.

Rollup of 8 pull requests Successful merges: - #135099 (Add FileCheck annotations to mir-opt/copy-prop) - #145903 (Give correct suggestion for a typo in raw pointers) - #147520 (Port the remaining SIMD intrinsics to const-eval) - #148068 (rustdoc: Use configured target modifiers when collecting doctests) - #148099 (Prepare to move debugger discovery from compiletest to bootstrap) - #148268 (rustdoc: fix `--emit=dep-info` on scraped examples) - #148306 (Remove double check when decoding ExpnId to avoid races) - #148378 (Fix documentation for std::panic::update_hook) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of #147520 - sayantn:simd-const-eval, r=RalfJung Port the remaining SIMD intrinsics to const-eval successor to #146568, this refactors some implementations and ports the implementation of `simd_fma` and `simd_relaxed_fma`to `rustc_const_eval` Also adds some remaining f16/f128 support in these intrinsics r? `@RalfJung`

Rollup of 8 pull requests Successful merges: - rust-lang/rust#135099 (Add FileCheck annotations to mir-opt/copy-prop) - rust-lang/rust#145903 (Give correct suggestion for a typo in raw pointers) - rust-lang/rust#147520 (Port the remaining SIMD intrinsics to const-eval) - rust-lang/rust#148068 (rustdoc: Use configured target modifiers when collecting doctests) - rust-lang/rust#148099 (Prepare to move debugger discovery from compiletest to bootstrap) - rust-lang/rust#148268 (rustdoc: fix `--emit=dep-info` on scraped examples) - rust-lang/rust#148306 (Remove double check when decoding ExpnId to avoid races) - rust-lang/rust#148378 (Fix documentation for std::panic::update_hook) r? `@ghost` `@rustbot` modify labels: rollup

…Jung Implement SIMD funnel shifts in const-eval/Miri Split off from rust-lang#147520 with just this change for easier review r? `@RalfJung`

…Jung Implement SIMD funnel shifts in const-eval/Miri Split off from rust-lang#147520 with just this change for easier review r? ``@RalfJung``

…Jung Implement SIMD funnel shifts in const-eval/Miri Split off from rust-lang#147520 with just this change for easier review r? ```@RalfJung```

Rollup merge of #147534 - sayantn:simd-funnel-shifts, r=RalfJung Implement SIMD funnel shifts in const-eval/Miri Split off from #147520 with just this change for easier review r? ```@RalfJung```

Implement SIMD funnel shifts in const-eval/Miri Split off from rust-lang/rust#147520 with just this change for easier review r? ```@RalfJung```

…llaumeGomez Rollup of 8 pull requests Successful merges: - rust-lang#135099 (Add FileCheck annotations to mir-opt/copy-prop) - rust-lang#145903 (Give correct suggestion for a typo in raw pointers) - rust-lang#147520 (Port the remaining SIMD intrinsics to const-eval) - rust-lang#148068 (rustdoc: Use configured target modifiers when collecting doctests) - rust-lang#148099 (Prepare to move debugger discovery from compiletest to bootstrap) - rust-lang#148268 (rustdoc: fix `--emit=dep-info` on scraped examples) - rust-lang#148306 (Remove double check when decoding ExpnId to avoid races) - rust-lang#148378 (Fix documentation for std::panic::update_hook) r? `@ghost` `@rustbot` modify labels: rollup

Implement SIMD funnel shifts in const-eval/Miri Split off from rust-lang/rust#147520 with just this change for easier review r? ```@RalfJung```

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Oct 9, 2025

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sayantn force-pushed the simd-const-eval branch from 344e3dc to b8a4c23 Compare October 9, 2025 11:59

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sayantn force-pushed the simd-const-eval branch from b8a4c23 to 69a2513 Compare October 9, 2025 17:53

sayantn mentioned this pull request Oct 9, 2025

Implement SIMD funnel shifts in const-eval/Miri #147534

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sayantn changed the title ~~Implement the remaining SIMD intrinsics in const-eval~~ Port the remaining SIMD intrinsics to const-eval Oct 9, 2025

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sayantn force-pushed the simd-const-eval branch from 69a2513 to 7c594eb Compare October 10, 2025 16:39

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sayantn added 4 commits November 3, 2025 12:22

Refactor implementation of float minmax intrinsics

d335ea9

Refactor float rounding intrinsics a bit

ebf2e10

Add some missing f16-f128 support in intrinsics

4d70bf4

Add Miri tests for f16/f128 SIMD operations

0681bae

sayantn force-pushed the simd-const-eval branch from 25ab970 to 0681bae Compare November 3, 2025 06:53

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Nov 3, 2025

GuillaumeGomez mentioned this pull request Nov 3, 2025

Rollup of 8 pull requests #148446

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bors merged commit c8625a5 into rust-lang:master Nov 3, 2025
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rustbot added this to the 1.93.0 milestone Nov 3, 2025

sayantn mentioned this pull request Nov 5, 2025

Implement SimdElement for f16 rust-lang/portable-simd#487

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sayantn deleted the simd-const-eval branch November 8, 2025 07:22

sayantn mentioned this pull request Nov 16, 2025

Make SIMD intrinsics available in const-contexts #147521

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