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fix(ssa): SSA interpreter to return 0 for Intrinsic::*RefCount when constrained #10033

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Merged
aakoshh merged 1 commit into from
Oct 2, 2025
Merged

fix(ssa): SSA interpreter to return 0 for Intrinsic::*RefCount when constrained #10033

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7 changes: 6 additions & 1 deletion compiler/noirc_evaluator/src/ssa/interpreter/intrinsics.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -454,7 +454,12 @@ impl<W: Write> Interpreter<'_, W> {
}
Intrinsic::ArrayRefCount | Intrinsic::SliceRefCount => {
let array = self.lookup_array_or_slice(args[0], "array/slice ref count")?;
let rc = *array.rc.borrow();
let mut rc = *array.rc.borrow();
// ACIR always returns 0 for the refcounts, and we expect that IncRc and DecRc don't appear in constrained SSA.
// The interpreter starts with a default ref-count value of 1. If it did not change, treat it as zero to match ACIR.
if !self.in_unconstrained_context() && rc == 1 {
rc = 0;
}
Ok(vec![Value::from_constant(rc.into(), NumericType::unsigned(32))?])
}
}
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