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Remove layouting dead code for non-array SIMD types.

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These aren't supported anymore, and are already rejected in type checking.
This commit is contained in:
Moulins 2025-03-01 12:40:06 +01:00
parent 6dd58511f2
commit c64ed1e187
1 changed files with 11 additions and 36 deletions
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47
crates/hir-ty/src/layout.rs
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@ -133,40 +133,22 @@ fn layout_of_simd_ty(
env: Arc<TraitEnvironment>,
dl: &TargetDataLayout,
) -> Result<Arc<Layout>, LayoutError> {
let fields = db.field_types(id.into());
// Supported SIMD vectors are homogeneous ADTs with at least one field:
// Supported SIMD vectors are homogeneous ADTs with exactly one array field:
//
// * #[repr(simd)] struct S(T, T, T, T);
// * #[repr(simd)] struct S { it: T, y: T, z: T, w: T }
// * #[repr(simd)] struct S([T; 4])
//
// where T is a primitive scalar (integer/float/pointer).
let f0_ty = match fields.iter().next() {
Some(it) => it.1.clone().substitute(Interner, subst),
None => return Err(LayoutError::InvalidSimdType),
let fields = db.field_types(id.into());
let mut fields = fields.iter();
let Some(TyKind::Array(e_ty, e_len)) = fields
.next()
.filter(|_| fields.next().is_none())
.map(|f| f.1.clone().substitute(Interner, subst).kind(Interner).clone())
else {
return Err(LayoutError::InvalidSimdType);
};
// The element type and number of elements of the SIMD vector
// are obtained from:
//
// * the element type and length of the single array field, if
// the first field is of array type, or
//
// * the homogeneous field type and the number of fields.
let (e_ty, e_len, is_array) = if let TyKind::Array(e_ty, _) = f0_ty.kind(Interner) {
// Extract the number of elements from the layout of the array field:
let FieldsShape::Array { count, .. } = db.layout_of_ty(f0_ty.clone(), env.clone())?.fields
else {
return Err(LayoutError::Unknown);
};
(e_ty.clone(), count, true)
} else {
// First ADT field is not an array:
(f0_ty, fields.iter().count() as u64, false)
};
let e_len = try_const_usize(db, &e_len).ok_or(LayoutError::HasErrorConst)? as u64;
// Compute the ABI of the element type:
let e_ly = db.layout_of_ty(e_ty, env)?;
@ -182,16 +164,9 @@ fn layout_of_simd_ty(
let align = dl.llvmlike_vector_align(size);
let size = size.align_to(align.abi);
// Compute the placement of the vector fields:
let fields = if is_array {
FieldsShape::Arbitrary { offsets: [Size::ZERO].into(), memory_index: [0].into() }
} else {
FieldsShape::Array { stride: e_ly.size, count: e_len }
};
Ok(Arc::new(Layout {
variants: Variants::Single { index: struct_variant_idx() },
fields,
fields: FieldsShape::Arbitrary { offsets: [Size::ZERO].into(), memory_index: [0].into() },
backend_repr: BackendRepr::SimdVector { element: e_abi, count: e_len },
largest_niche: e_ly.largest_niche,
uninhabited: false,