// Check that we have a constant operand on one side (candidate for identity).
  const bool is_commutative =
      (std::is_same<OpT, AddV2Op>::value || std::is_same<OpT, MulOp>::value);
  auto lhs_attr = mlir::dyn_cast_or_null<DenseElementsAttr>(operands[0]);
  auto rhs_attr = mlir::dyn_cast_or_null<DenseElementsAttr>(operands[1]);
  if (!rhs_attr && !(is_commutative && lhs_attr)) return {};