auto input_type = operand0.getType().cast<ShapedType>();

  // Check axis bounds.
  if (input_type.hasRank()) {
    int32_t axis_value = op.getAxis();
    if (axis_value < 0) axis_value += input_type.getRank() + 1;
    if (axis_value < 0 || axis_value >= input_type.getRank() + 1)
      return op.emitOpError()
             << "op attribute 'axis' should be in range [-rank - 1, rank + 1), "

  auto shape = llvm::to_vector<2>(indices_ty.getShape());
  if (axis_val == -1) axis_val = shape.size();

  int64_t depth_val = ShapedType::kDynamic;
  DenseIntElementsAttr depth_attr;
  if (matchPattern(depth, m_Constant(&depth_attr)) &&
      depth_attr.getNumElements() == 1)
    depth_val = (*depth_attr.begin()).getSExtValue();
  shape.insert(shape.begin() + axis_val, depth_val);