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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 e2e598f5fb
commit dc5a8c8881
1 changed files with 4 additions and 3 deletions
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7
src/base.rs
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@ -802,14 +802,15 @@ fn is_fat_ptr<'tcx>(fx: &FunctionCx<'_, '_, 'tcx>, ty: Ty<'tcx>) -> bool {
if active_field_index.is_some() {
assert_eq!(operands.len(), 1);
}
for (i, operand) in operands.iter().enumerate() {
for (i, operand) in operands.iter_enumerated() {
let operand = codegen_operand(fx, operand);
let field_index = active_field_index.unwrap_or(i);
let to = if let mir::AggregateKind::Array(_) = **kind {
let index = fx.bcx.ins().iconst(fx.pointer_type, field_index as i64);
let array_index = i64::from(field_index.as_u32());
let index = fx.bcx.ins().iconst(fx.pointer_type, array_index);
variant_dest.place_index(fx, index)
} else {
variant_dest.place_field(fx, FieldIdx::new(field_index))
variant_dest.place_field(fx, field_index)
};
to.write_cvalue(fx, operand);
}