IVGCVSW-2997 Refactor reference LSTM workload

Signed-off-by: Nattapat Chaimanowong <nattapat.chaimanowong@arm.com>
Change-Id: I6883f878d9f701a55153292769d2fc0530d2529e
diff --git a/src/backends/reference/workloads/RefLstmWorkload.hpp b/src/backends/reference/workloads/RefLstmWorkload.hpp
new file mode 100644
index 0000000..38e3fb9
--- /dev/null
+++ b/src/backends/reference/workloads/RefLstmWorkload.hpp
@@ -0,0 +1,43 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include <armnn/TypesUtils.hpp>
+
+#include <backendsCommon/Workload.hpp>
+#include <backendsCommon/WorkloadData.hpp>
+
+namespace armnn
+{
+
+class RefLstmWorkload : public BaseWorkload<LstmQueueDescriptor>
+{
+public:
+    explicit RefLstmWorkload(const LstmQueueDescriptor& descriptor, const WorkloadInfo& info);
+
+    virtual void Execute() const override;
+
+private:
+    std::unique_ptr<ScopedCpuTensorHandle> m_InputToInputWeightsTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_InputToForgetWeightsTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_InputToCellWeightsTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_InputToOutputWeightsTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_RecurrentToInputWeightsTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_RecurrentToForgetWeightsTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_RecurrentToCellWeightsTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_RecurrentToOutputWeightsTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_CellToInputWeightsTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_CellToForgetWeightsTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_CellToOutputWeightsTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_InputGateBiasTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_ForgetGateBiasTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_CellBiasTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_OutputGateBiasTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_ProjectionWeightsTensor;
+    std::unique_ptr<ScopedCpuTensorHandle> m_ProjectionBiasTensor;
+};
+
+} //namespace armnn