1 use crate::util::expand_aggregate;
3 use rustc_middle::mir::*;
4 use rustc_middle::ty::TyCtxt;
6 pub struct Deaggregator;
8 impl<'tcx> MirPass<'tcx> for Deaggregator {
9 fn phase_change(&self) -> Option<MirPhase> {
10 Some(MirPhase::Deaggregated)
13 fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
14 let basic_blocks = body.basic_blocks.as_mut_preserves_cfg();
15 for bb in basic_blocks {
16 bb.expand_statements(|stmt| {
17 // FIXME(eddyb) don't match twice on `stmt.kind` (post-NLL).
19 // FIXME(#48193) Deaggregate arrays when it's cheaper to do so.
20 StatementKind::Assign(box (
22 Rvalue::Aggregate(box AggregateKind::Array(_), _),
26 StatementKind::Assign(box (_, Rvalue::Aggregate(_, _))) => {}
30 let stmt = stmt.replace_nop();
31 let source_info = stmt.source_info;
32 let StatementKind::Assign(box (lhs, Rvalue::Aggregate(kind, operands))) = stmt.kind else {
36 Some(expand_aggregate(
38 operands.into_iter().map(|op| {
39 let ty = op.ty(&body.local_decls, tcx);