bjoernager/rust
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Use FieldIdx in various things related to aggregates

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Shrank `AggregateKind` by 8 bytes on x64, since the active field of a union is tracked as an `Option<FieldIdx>` instead of `Option<usize>`.
This commit is contained in:
Scott McMurray 2023-04-01 20:11:38 -07:00
parent 480068c235
commit b5b6def021
13 changed files with 51 additions and 46 deletions
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6
compiler/rustc_codegen_ssa/src/base.rs
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@ -306,9 +306,9 @@ pub fn coerce_unsized_into<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
(&ty::Adt(def_a, _), &ty::Adt(def_b, _)) => {
assert_eq!(def_a, def_b);
for i in 0..def_a.variant(FIRST_VARIANT).fields.len() {
let src_f = src.project_field(bx, i);
let dst_f = dst.project_field(bx, i);
for i in def_a.variant(FIRST_VARIANT).fields.indices() {
let src_f = src.project_field(bx, i.as_usize());
let dst_f = dst.project_field(bx, i.as_usize());
if dst_f.layout.is_zst() {
continue;