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Rollup merge of #137447 - folkertdev:simd-extract-insert-dyn, r=scottmcm

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add `core::intrinsics::simd::{simd_extract_dyn, simd_insert_dyn}`

fixes https://github.com/rust-lang/rust/issues/137372

adds `core::intrinsics::simd::{simd_extract_dyn, simd_insert_dyn}`, which contrary to their non-dyn counterparts allow a non-const index. Many platforms (but notably not x86_64 or aarch64) have dedicated instructions for this operation, which stdarch can emit with this change.

Future work is to also make the `Index` operation on the `Simd` type emit this operation, but the intrinsic can't be used directly. We'll need some MIR shenanigans for that.

r? `@ghost`
This commit is contained in:
Stuart Cook 2025-04-11 13:31:43 +10:00 • committed by GitHub
commit 45ebc4060b
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6 changed files with 197 additions and 37 deletions
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8
compiler/rustc_hir_analysis/src/check/intrinsic.rs
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@ -659,8 +659,12 @@ pub(crate) fn check_intrinsic_type(
sym::simd_masked_load => (3, 0, vec![param(0), param(1), param(2)], param(2)),
sym::simd_masked_store => (3, 0, vec![param(0), param(1), param(2)], tcx.types.unit),
sym::simd_scatter => (3, 0, vec![param(0), param(1), param(2)], tcx.types.unit),
sym::simd_insert => (2, 0, vec![param(0), tcx.types.u32, param(1)], param(0)),
sym::simd_extract => (2, 0, vec![param(0), tcx.types.u32], param(1)),
sym::simd_insert | sym::simd_insert_dyn => {
(2, 0, vec![param(0), tcx.types.u32, param(1)], param(0))
}
sym::simd_extract | sym::simd_extract_dyn => {
(2, 0, vec![param(0), tcx.types.u32], param(1))
}
sym::simd_cast
| sym::simd_as
| sym::simd_cast_ptr