// if there is only one.
Operation* GetUserIfOnlyOne(Operation* op) {
  if (op->getNumResults() != 1) return nullptr;
  auto result = op->getResult(0);
  if (!result.hasOneUse()) return nullptr;
  return (*result.getUses().begin()).getOwner();
}

// Gets operation providing value for the given operand of given operation
// if the given operation is the only user.
Operation* GetInputOpWithOneUse(Operation* op, int opr_num) {

    // Unsure if this check is required.
    if (state.pos != pos) {
      return;
    }
  }
  if (pos == RequantizeState::ON_OUTPUT) {
    Operation* user = value.getUses().begin().getUser();
    if (isa<quantfork::QuantizeCastOp>(user)) {
      // The requantize op is inserted between `quantize` and `dequantize` ops.
      value = user->getResult(0);
      builder_.setInsertionPointAfter(user);

}

std::optional<RankedTensorType> GetElementTypeFromAccess(
    Value collection, ModuleOp module,
    llvm::function_ref<std::optional<Type>(Operation*)> infer_from_op) {
  for (auto& use : collection.getUses()) {
    if (auto while_op = llvm::dyn_cast<TF::WhileOp>(use.getOwner())) {
      auto body = while_op.body_function();
      assert(body);
      auto type_from_body = GetElementTypeFromAccess(

  // updated in the function.
  llvm::SmallSet<int, 4> indexes;
  for (BlockArgument &arg : func.getArguments()) {
    if (tensor_list_args.contains(arg.getArgNumber())) {
      for (const mlir::OpOperand &use : arg.getUses()) {
        mlir::Operation *op = use.getOwner();
        // Currently we only check if the tensorlist argument is consumed by
        // `TensorListPushBack` or `TensorListResize`, since those are the only

Value GetResultInBlock(Value value, llvm::DenseSet<Block*> target_blocks) {
  while (target_blocks.find(value.getParentBlock()) == target_blocks.end()) {
    Value new_value = nullptr;
    for (OpOperand& operand : value.getUses()) {
      Operation* owner = operand.getOwner();
      if (!llvm::isa<tf_device::ReturnOp>(owner)) continue;
      Operation* parent = owner->getParentOp();  // op that owns the "return"

      }
      return_operands.push_back(resource.live_value);
      result_types.push_back(resource.live_value.getType());
    }

    if (is_var_handle && !resource.read) {
      assert(block.getArgument(index).getUses().empty());
      argument_indices_to_remove.push_back(index);
    } else {
      if (is_var_handle) {
        // Add resource_name attribute to VarHandleOp read.
        function.setArgAttr(

    for (Operation* user : island.getControl().getUsers()) {
      DCHECK_EQ(user->getParentOp(), graph);
      try_update_current_candidate(user);
    }

    // Check island data results.
    Block& graph_body = llvm::cast<GraphOp>(graph).GetBody();
    for (Value result : island.getOutputs()) {
      for (Operation* user : result.getUsers()) {
        Operation* def = graph_body.findAncestorOpInBlock(*user);

    if (constant_op.getValue().getNumElements() > 32) continue;
    while (!constant_op.getResult().hasOneUse()) {
      auto new_constant_op = builder.clone(*constant_op.getOperation());
      constant_op.getResult().getUses().begin()->assign(
          dyn_cast<mlir::stablehlo::ConstantOp>(new_constant_op));
    }
  }
}

void ReplaceStablehloOpsInMainFunctionWithXlaCallModuleOpsPass::
    runOnOperation() {

    if (op.getNumOperands() != 0 || op.getNumResults() != 1 ||
        !HasSingleOpInBlock<YieldOp>(&op.GetBody()))
      return failure();

    for (auto &use : llvm::make_early_inc_range(op.getControl().getUses()))
      use.getOwner()->eraseOperand(use.getOperandNumber());

    rewriter.eraseOp(op);

    return success();
  }
};

          nullptr};
    }
    // Check the current operation has a consumer node.
    Operation* consumer_op =
        current->getResult(0).getUses().begin()->getOwner();
    if (!consumer_op) {
      return {
          rewriter.notifyMatchFailure(current, "op doesn't have consumer node"),
          nullptr};
    }