rustc_scalable_vector(N) - #143924
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rustc_scalable_vector(N)#143924
rustc_scalable_vector(N)#143924Conversation
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Some changes occurred in compiler/rustc_attr_parsing Some changes occurred in compiler/rustc_attr_data_structures Some changes occurred in compiler/rustc_passes/src/check_attr.rs Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr Some changes occurred to the CTFE / Miri interpreter cc @rust-lang/miri Some changes occurred to the platform-builtins intrinsics. Make sure the cc @antoyo, @GuillaumeGomez, @bjorn3, @calebzulawski, @programmerjake Some changes occurred to MIR optimizations cc @rust-lang/wg-mir-opt Some changes occurred in compiler/rustc_codegen_ssa Some changes occurred in compiler/rustc_codegen_gcc changes to the core type system Some changes occurred to the CTFE machinery |
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I've changed this back to a draft and marked it as |
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I do not intend to have repr(simd) survive this year, so I do not think this should be added.
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Could you elaborate? |
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I intend to replace it with an approach based on lang items for a variety of reasons, one of them being that to start with, the |
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The `fmt::Debug` impl for `TyAndLayout<'a, Ty>'` requires `fmt::Display` on the `Ty` parameter. In `ArgAbi`, `TyAndLayout`'s Ty` is instantiated with a parameter that implements `TyAbiInterface`. `TyAbiInterface` only required `fmt::Debug` be implemented on `Self`, not `fmt::Display`, which meant that it wasn't actually possible to debug print `ArgAbi`.
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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. |
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@bors r=workingjubilee |
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☀️ Test successful - checks-actions |
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What is this?This is an experimental post-merge analysis report that shows differences in test outcomes between the merged PR and its parent PR.Comparing 61cc47e (parent) -> 95a27ad (this PR) Test differencesShow 224 test diffsStage 0
Stage 1
Stage 2
(and 96 additional test diffs) Additionally, 28 doctest diffs were found. These are ignored, as they are noisy. Job group index
Test dashboardRun cargo run --manifest-path src/ci/citool/Cargo.toml -- \
test-dashboard 95a27adcf907bcc1046602c3746dad8cfdf3bf3f --output-dir test-dashboardAnd then open Job duration changes
How to interpret the job duration changes?Job durations can vary a lot, based on the actual runner instance |
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Finished benchmarking commit (95a27ad): comparison URL. Overall result: ❌✅ regressions and improvements - no action needed@rustbot label: -perf-regression Instruction countOur most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.
Max RSS (memory usage)Results (secondary 1.2%)A less reliable metric. May be of interest, but not used to determine the overall result above.
CyclesResults (secondary -1.7%)A less reliable metric. May be of interest, but not used to determine the overall result above.
Binary sizeResults (primary 0.1%, secondary 0.0%)A less reliable metric. May be of interest, but not used to determine the overall result above.
Bootstrap: 478.546s -> 479.485s (0.20%) |
This was referenced Dec 16, 2025
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`simd_reinterpret` was expected to be used when it was added as `transmute_unchecked` requires `Sized`, but scalable vectors are now `Sized` so `transmute_unchecked` can be used and `simd_reinterpret` was not added in rust-lang/rust#143924.
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`simd_reinterpret` was expected to be used when it was added as `transmute_unchecked` requires `Sized`, but scalable vectors are now `Sized` so `transmute_unchecked` can be used and `simd_reinterpret` was not added in rust-lang/rust#143924.
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`simd_reinterpret` was expected to be used when it was added as `transmute_unchecked` requires `Sized`, but scalable vectors are now `Sized` so `transmute_unchecked` can be used and `simd_reinterpret` was not added in rust-lang/rust#143924.
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Mar 4, 2026
`simd_reinterpret` was expected to be used when it was added as `transmute_unchecked` requires `Sized`, but scalable vectors are now `Sized` so `transmute_unchecked` can be used and `simd_reinterpret` was not added in rust-lang/rust#143924.
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`simd_reinterpret` was expected to be used when it was added as `transmute_unchecked` requires `Sized`, but scalable vectors are now `Sized` so `transmute_unchecked` can be used and `simd_reinterpret` was not added in rust-lang/rust#143924.
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`simd_reinterpret` was expected to be used when it was added as `transmute_unchecked` requires `Sized`, but scalable vectors are now `Sized` so `transmute_unchecked` can be used and `simd_reinterpret` was not added in rust-lang/rust#143924.
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`simd_reinterpret` was expected to be used when it was added as `transmute_unchecked` requires `Sized`, but scalable vectors are now `Sized` so `transmute_unchecked` can be used and `simd_reinterpret` was not added in rust-lang/rust#143924.
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`simd_reinterpret` was expected to be used when it was added as `transmute_unchecked` requires `Sized`, but scalable vectors are now `Sized` so `transmute_unchecked` can be used and `simd_reinterpret` was not added in rust-lang#143924.
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…ingjubilee `rustc_scalable_vector(N)` Supercedes rust-lang#118917. Initial experimental implementation of rust-lang/rfcs#3838. Introduces a `rustc_scalable_vector(N)` attribute that can be applied to types with a single `[$ty]` field (for `u{16,32,64}`, `i{16,32,64}`, `f{32,64}`, `bool`). `rustc_scalable_vector` types are lowered to scalable vectors in the codegen backend. As with any unstable feature, there will necessarily be follow-ups as we experiment and find cases that we've not considered or still need some logic to handle, but this aims to be a decent baseline to start from. See rust-lang#145052 for request for a lang experiment.
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Supercedes #118917.
Initial experimental implementation of rust-lang/rfcs#3838. Introduces a
rustc_scalable_vector(N)attribute that can be applied to types with a single[$ty]field (foru{16,32,64},i{16,32,64},f{32,64},bool).rustc_scalable_vectortypes are lowered to scalable vectors in the codegen backend.As with any unstable feature, there will necessarily be follow-ups as we experiment and find cases that we've not considered or still need some logic to handle, but this aims to be a decent baseline to start from.
See #145052 for request for a lang experiment.