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fix: preserve arrays on false conditional stores #249

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fix: preserve arrays on false conditional stores #249

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37 changes: 32 additions & 5 deletions src/ir/opt/mem/lin.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -158,12 +158,18 @@ impl RewritePass for Linearizer {
.unwrap_or_else(|| tup.clone()),
)
} else {
let mut updates =
let updates =
(0..a.size).map(|idx| term![Op::Update(idx); tup.clone(), val.clone()]);
let first = updates.next().unwrap();
Some(a.key.elems_iter().take(a.size).skip(1).zip(updates).fold(first, |acc, (idx_c, update)| {
term![Op::Ite; term![AND; term![Op::Eq; idx.clone(), idx_c], cond.clone()], update, acc]
}))
Some(a.key.elems_iter().take(a.size).zip(updates).fold(
tup.clone(),
|acc, (idx_c, update)| {
term![Op::Ite;
term![AND; term![Op::Eq; idx.clone(), idx_c], cond.clone()],
update,
acc
]
},
))
}
} else {
unreachable!()
Expand All @@ -184,6 +190,7 @@ pub fn linearize(c: &mut Computation) {
#[cfg(test)]
mod test {
use super::*;
use crate::ir::opt::cfold;

fn array_free(t: &Term) -> bool {
for c in PostOrderIter::new(t.clone()) {
Expand Down Expand Up @@ -291,4 +298,24 @@ mod test {
assert!(array_free(&c.outputs[0]));
assert_eq!(3 + 1 + 3, count_ites(&c.outputs[0]));
}

#[test]
fn false_dynamic_conditional_store_preserves_array() {
let mut c = text::parse_computation(
b"
(computation
(metadata (parties ) (inputs (idx (bv 4))) (commitments))
(precompute () () (#t ))
(select
(cstore (#a (bv 4) #x0 2 ()) idx #xf false)
#x0
)
)
",
);

linearize(&mut c);

assert_eq!(cfold::fold(&c.outputs[0], &[]), bv_lit(0, 4));
}
}