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Remove clones and most allocations from propagate_to_fixpoint

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This commit is contained in:
Eric Holk 2021-12-16 15:46:56 -08:00
parent a7df4e8d2f
commit 7d11b336f3
1 changed files with 6 additions and 6 deletions
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12
compiler/rustc_typeck/src/check/generator_interior/drop_ranges/cfg_propagate.rs
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@ -9,16 +9,17 @@ impl DropRangesBuilder {
trace!("predecessors: {:#?}", preds.iter_enumerated().collect::<BTreeMap<_, _>>());
let mut new_state = BitSet::new_empty(self.num_values());
let mut propagate = || {
let mut changed = false;
for id in self.nodes.indices() {
let old_state = self.nodes[id].drop_state.clone();
let mut new_state = if id.index() == 0 {
BitSet::new_empty(self.num_values())
if id.index() == 0 {
new_state.clear();
} else {
// If we are not the start node and we have no predecessors, treat
// everything as dropped because there's no way to get here anyway.
BitSet::new_filled(self.num_values())
new_state.insert_all();
};
for pred in &preds[id] {
@ -34,8 +35,7 @@ impl DropRangesBuilder {
new_state.remove(*reinit);
}
changed |= old_state != new_state;
self.nodes[id].drop_state = new_state;
changed |= self.nodes[id].drop_state.intersect(&new_state);
}
changed