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Flood aggregate assignments with Top.

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This commit is contained in:
Camille GILLOT 2023-02-18 09:57:13 +00:00
parent 650683756f
commit 7213eaa1c0
2 changed files with 5 additions and 3 deletions
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5
compiler/rustc_mir_transform/src/dataflow_const_prop.rs
View File

@ -122,7 +122,10 @@ impl<'tcx> ValueAnalysis<'tcx> for ConstAnalysis<'_, 'tcx> {
) {
match rvalue {
Rvalue::Aggregate(kind, operands) => {
state.flood_with(target.as_ref(), self.map(), FlatSet::Bottom);
// If we assign `target = Enum::Variant#0(operand)`,
// we must make sure that all `target as Variant#i` are `Top`.
state.flood(target.as_ref(), self.map());
if let Some(target_idx) = self.map().find(target.as_ref()) {
let (variant_target, variant_index) = match **kind {
AggregateKind::Tuple | AggregateKind::Closure(..) => {

3
tests/mir-opt/dataflow-const-prop/enum.multiple.DataflowConstProp.diff
View File

@ -71,8 +71,7 @@
bb7: {
StorageLive(_9); // scope 2 at $DIR/enum.rs:+11:9: +11:10
- _9 = _6; // scope 2 at $DIR/enum.rs:+11:13: +11:14
+ _9 = const 0_u8; // scope 2 at $DIR/enum.rs:+11:13: +11:14
_9 = _6; // scope 2 at $DIR/enum.rs:+11:13: +11:14
_0 = const (); // scope 0 at $DIR/enum.rs:+0:29: +12:2
StorageDead(_9); // scope 2 at $DIR/enum.rs:+12:1: +12:2
StorageDead(_6); // scope 1 at $DIR/enum.rs:+12:1: +12:2