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fix: fold boolean OR complements to true #252

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fix: fold boolean OR complements to true #252

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14 changes: 10 additions & 4 deletions src/ir/opt/cfold.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -132,11 +132,10 @@ pub fn fold_cache(node: &Term, cache: &mut TermCache<TTerm>, ignore: &[Op]) -> T
Some(if *flattened.op() == OR {
let mut dedup_children = TermSet::default();
for t in flattened.cs().iter() {
if dedup_children.contains(&term![Op::Not; t.clone()]) {
dedup_children.remove(&term![Op::Not; t.clone()]);
} else {
dedup_children.insert(t.clone());
if dedup_children.contains(&neg_bool(t.clone())) {
return bool_lit(true);
}
dedup_children.insert(t.clone());
}

match dedup_children.len().cmp(&1) {
Expand Down Expand Up @@ -737,6 +736,13 @@ mod test {
assert_eq!(fold(&term![OR; bool(false), bool(true)], &[]), bool(true),);
}

#[test]
fn b_or_complement() {
let a = var("a".to_owned(), Sort::Bool);
assert_eq!(fold(&term![OR; a.clone(), term![NOT; a.clone()]], &[]), bool(true));
assert_eq!(fold(&term![OR; term![NOT; a.clone()], a], &[]), bool(true));
}

#[test]
fn b_and() {
assert_eq!(fold(&term![AND; bool(false), bool(true)], &[]), bool(false),);
Expand Down