rust/compiler/rustc_codegen_ssa at 98242676d9ef57ea6e6224a45229ea65025b7a84 - rust

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T

Jacob Pratt 803a7227fb Rollup merge of #155005 - folkertdev:simd-element-type-llvm, r=nnethercote

preserve SIMD element type information

Preserve the SIMD element type and provide it to LLVM for better optimization.

This is relevant for AArch64 types like `int16x4x2_t`, see also https://github.com/llvm/llvm-project/issues/181514. Such types are defined like so:

```rust
#[repr(simd)]
struct int16x4_t([i16; 4]);

#[repr(C)]
struct int16x4x2_t(pub int16x4_t, pub int16x4_t);
```

Previously this would be translated to the opaque `[2 x <8 x i8>]`, with this PR it is instead `[2 x <4 x i16>]`. That change is not relevant for the ABI, but using the correct type prevents bitcasts that can (indeed, do) confuse the LLVM pattern matcher.

This change will make it possible to implement the deinterleaving loads on AArch64 in a portable way (without neon-specific intrinsics), which means that e.g. Miri or the cranelift backend can run them without additional support.

discussion at [#t-compiler > loss of vector element type information](https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/loss.20of.20vector.20element.20type.20information/with/584483611)

2026-04-14 00:37:24 -04:00

src

Rollup merge of #155005 - folkertdev:simd-element-type-llvm, r=nnethercote

2026-04-14 00:37:24 -04:00

Cargo.toml

Port rustc_expected_cgu_reuse to the new attribute parser

2026-02-10 10:10:38 +01:00

README.md

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README.md

Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.