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Don't extend lifetime of temp in Repeat expressions

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This commit is contained in:
Dylan MacKenzie 2019-10-23 10:30:51 -07:00
parent d6431f69ad
commit 420457e5ca
1 changed files with 11 additions and 18 deletions
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29
src/librustc_mir/transform/qualify_consts.rs
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@ -1065,30 +1065,23 @@ impl<'a, 'tcx> Checker<'a, 'tcx> {
} else {
self.valid_promotion_candidates()
};
debug!("qualify_const: promotion_candidates={:?}", promotion_candidates);
for candidate in promotion_candidates {
let promoted_place = match candidate {
Candidate::Repeat(Location { block: bb, statement_index: stmt_idx }) => {
match &self.body[bb].statements[stmt_idx].kind {
StatementKind::Assign(box(_, Rvalue::Repeat(Operand::Move(place), _)))
=> place,
_ => continue,
}
}
match candidate {
Candidate::Ref(Location { block: bb, statement_index: stmt_idx }) => {
match &self.body[bb].statements[stmt_idx].kind {
StatementKind::Assign(box( _, Rvalue::Ref(_, _, place))) => place,
_ => continue,
if let StatementKind::Assign(box( _, Rvalue::Ref(_, _, place)))
= &self.body[bb].statements[stmt_idx].kind
{
if let PlaceBase::Local(local) = place.base {
promoted_temps.insert(local);
}
}
}
Candidate::Argument { .. } => continue,
};
match promoted_place.base {
PlaceBase::Local(local) if !promoted_place.is_indirect() => {
promoted_temps.insert(local);
}
_ => {}
// Only rvalue-static promotion requires extending the lifetime of the promoted
// local.
Candidate::Argument { .. } | Candidate::Repeat(_) => {}
}
}