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fix: avoid duplicating constant arrays #5287

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merged 2 commits into from
Jun 19, 2024
Merged

fix: avoid duplicating constant arrays #5287

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34cffdb
avoid duplicating constant arrays
guipublic Jun 19, 2024
ee5bbf2
Merge branch 'master' into gd/dup_array
guipublic Jun 19, 2024
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18 changes: 13 additions & 5 deletions compiler/noirc_evaluator/src/ssa/ir/function_inserter.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,11 +16,12 @@ pub(crate) struct FunctionInserter<'f> {
pub(crate) function: &'f mut Function,

values: HashMap<ValueId, ValueId>,
const_arrays: HashMap<im::Vector<ValueId>, ValueId>,
}

impl<'f> FunctionInserter<'f> {
pub(crate) fn new(function: &'f mut Function) -> FunctionInserter<'f> {
Self { function, values: HashMap::default() }
Self { function, values: HashMap::default(), const_arrays: HashMap::default() }
}

/// Resolves a ValueId to its new, updated value.
Expand All @@ -34,10 +35,17 @@ impl<'f> FunctionInserter<'f> {
super::value::Value::Array { array, typ } => {
let array = array.clone();
let typ = typ.clone();
let new_array = array.iter().map(|id| self.resolve(*id)).collect();
let new_id = self.function.dfg.make_array(new_array, typ);
self.values.insert(value, new_id);
new_id
let new_array: im::Vector<ValueId> =
array.iter().map(|id| self.resolve(*id)).collect();
if self.const_arrays.get(&new_array) == Some(&value) {
value
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} else {
let new_array_clone = new_array.clone();
let new_id = self.function.dfg.make_array(new_array, typ);
self.values.insert(value, new_id);
self.const_arrays.insert(new_array_clone, new_id);
new_id
}
}
_ => value,
},
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