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Make index_by_increasing_offset return one item for primitives

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This commit is contained in:
Scott McMurray 2024-05-11 15:26:49 -07:00
parent dcab06d7d2
commit 99213ae164
2 changed files with 8 additions and 12 deletions
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7
compiler/rustc_abi/src/lib.rs
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@ -1271,7 +1271,12 @@ pub fn index_by_increasing_offset(&self) -> impl ExactSizeIterator<Item = usize>
}
}
(0..self.count()).map(move |i| match *self {
// Primitives don't really have fields in the way that structs do,
// but having this return an empty iterator for them is unhelpful
// since that makes them look kinda like ZSTs, which they're not.
let pseudofield_count = if let FieldsShape::Primitive = self { 1 } else { self.count() };
(0..pseudofield_count).map(move |i| match *self {
FieldsShape::Primitive | FieldsShape::Union(_) | FieldsShape::Array { .. } => i,
FieldsShape::Arbitrary { .. } => {
if use_small {

13
compiler/rustc_codegen_ssa/src/mir/rvalue.rs
View File

@ -18,7 +18,6 @@
use rustc_target::abi::{self, FieldIdx, FIRST_VARIANT};
use arrayvec::ArrayVec;
use either::Either;
impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
#[instrument(level = "trace", skip(self, bx))]
@ -698,24 +697,16 @@ pub fn codegen_rvalue_operand(
}
mir::Rvalue::Use(ref operand) => self.codegen_operand(bx, operand),
mir::Rvalue::Repeat(..) => bug!("{rvalue:?} in codegen_rvalue_operand"),
mir::Rvalue::Aggregate(ref kind, ref fields) => {
mir::Rvalue::Aggregate(_, ref fields) => {
let ty = rvalue.ty(self.mir, self.cx.tcx());
let ty = self.monomorphize(ty);
let layout = self.cx.layout_of(ty);
let field_indices = if let mir::AggregateKind::RawPtr(..) = **kind {
// `index_by_increasing_offset` gives an empty iterator for primitives
Either::Left([0_usize, 1_usize].iter().copied())
} else {
Either::Right(layout.fields.index_by_increasing_offset())
};
debug_assert_eq!(field_indices.len(), fields.len());
// `rvalue_creates_operand` has arranged that we only get here if
// we can build the aggregate immediate from the field immediates.
let mut inputs = ArrayVec::<Bx::Value, 2>::new();
let mut input_scalars = ArrayVec::<abi::Scalar, 2>::new();
for field_idx in field_indices {
for field_idx in layout.fields.index_by_increasing_offset() {
let field_idx = FieldIdx::from_usize(field_idx);
let op = self.codegen_operand(bx, &fields[field_idx]);
let values = op.val.immediates_or_place().left_or_else(|p| {