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+/*
+ * Copyright (c) 2019 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __ARM_COMPUTE_CLLSTMLAYERQUANTIZED_H__
+#define __ARM_COMPUTE_CLLSTMLAYERQUANTIZED_H__
+
+#include "arm_compute/core/Types.h"
+#include "arm_compute/runtime/CL/functions/CLActivationLayer.h"
+#include "arm_compute/runtime/CL/functions/CLConcatenateLayer.h"
+#include "arm_compute/runtime/CL/functions/CLDequantizationLayer.h"
+#include "arm_compute/runtime/CL/functions/CLElementwiseOperations.h"
+#include "arm_compute/runtime/CL/functions/CLGEMMLowpMatrixMultiplyCore.h"
+#include "arm_compute/runtime/CL/functions/CLGEMMLowpOutputStage.h"
+#include "arm_compute/runtime/CL/functions/CLPixelWiseMultiplication.h"
+#include "arm_compute/runtime/CL/functions/CLQuantizationLayer.h"
+#include "arm_compute/runtime/CL/functions/CLSlice.h"
+#include "arm_compute/runtime/CL/functions/CLTranspose.h"
+
+#include "arm_compute/runtime/common/LSTMParams.h"
+
+namespace arm_compute
+{
+// Forward declarations
+class ICLTensor;
+
+/** Basic function to run @ref CLLSTMLayerQuantized
+ *
+ * This function calls the following CL functions/kernels:
+ *
+ * -# @ref CLGEMMLowpMatrixMultiplyCore                          Quantized matrix multiplication core. Accumulators are 32-bit integers
+ * -# @ref CLGEMMLowpQuantizeDownInt32ToInt16ScaleByFixedPoint   Convert 32-bit integers into QSYMM16
+ * -# @ref CLTranspose                                           Matrix transpose
+ * -# @ref CLConcatenateLayer                                    Tensor concatenation
+ * -# @ref CLActivationLayer                                     Activation functions (tanh and logistic)
+ * -# @ref CLArithmeticAddition                                  Elementwise addition
+ * -# @ref CLPixelWiseMultiplication                             Elementwise multiplication
+ * -# @ref CLSlice                                               Tensor slicing
+ * -# @ref CLDequantizationLayer                                 Dequantize into float
+ * -# @ref CLQuantizationLayer                                   Quantize from float
+ * */
+class CLLSTMLayerQuantized : public IFunction
+{
+public:
+    /** Default constructor */
+    CLLSTMLayerQuantized(std::shared_ptr<IMemoryManager> memory_manager = nullptr);
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
+    CLLSTMLayerQuantized(const CLLSTMLayerQuantized &) = delete;
+    /** Default move constructor */
+    CLLSTMLayerQuantized(CLLSTMLayerQuantized &&) = default;
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
+    CLLSTMLayerQuantized &operator=(const CLLSTMLayerQuantized &) = delete;
+    /** Default move assignment operator */
+    CLLSTMLayerQuantized &operator=(CLLSTMLayerQuantized &&) = default;
+    /** Initialize function's tensors.
+     *
+     * @param[in]  input                       Source tensor. Input is a 2D tensor with dimensions [input_size, batch_size]. Data types supported: QASYMM8.
+     * @param[in]  input_to_input_weights      2D weights tensor with dimensions [input_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  input_to_forget_weights     2D weights tensor with dimensions [input_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  input_to_cell_weights       2D weights tensor with dimensions [input_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  input_to_output_weights     2D weights tensor with dimensions [input_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  recurrent_to_input_weights  2D weights tensor with dimensions [output_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  recurrent_to_forget_weights 2D weights tensor with dimensions [output_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  recurrent_to_cell_weights   2D weights tensor with dimensions [output_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  recurrent_to_output_weights 2D weights tensor with dimensions [output_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  input_gate_bias             1D weights tensor with dimensions [output_size]. Data type supported: S32.
+     * @param[in]  forget_gate_bias            1D weights tensor with dimensions [output_size]. Data type supported: S32.
+     * @param[in]  cell_bias                   1D weights tensor with dimensions [output_size]. Data type supported: S32.
+     * @param[in]  output_gate_bias            1D weights tensor with dimensions [output_size]. Data type supported: S32.
+     * @param[in]  cell_state_in               2D tensor with dimensions [output_size, batch_size]. Data type supported:  QSYMM16.
+     * @param[in]  output_state_in             2D tensor with dimensions [output_size, batch_size]. Data type supported: Same as @p input.
+     * @param[out] cell_state_out              Destination tensor. Output is a 2D tensor with dimensions [output_size, batch_size]. Data type supported:  QSYMM16.
+     * @param[out] output_state_out            Destination tensor. Output is a 2D tensor with dimensions [output_size, batch_size].Data types supported: Same as @p input.
+     */
+    void configure(const ICLTensor *input,
+                   const ICLTensor *input_to_input_weights, const ICLTensor *input_to_forget_weights, const ICLTensor *input_to_cell_weights, const ICLTensor *input_to_output_weights,
+                   const ICLTensor *recurrent_to_input_weights, const ICLTensor *recurrent_to_forget_weights, const ICLTensor *recurrent_to_cell_weights, const ICLTensor *recurrent_to_output_weights,
+                   const ICLTensor *input_gate_bias, const ICLTensor *forget_gate_bias, const ICLTensor *cell_bias, const ICLTensor *output_gate_bias,
+                   ICLTensor *cell_state_in, const ICLTensor *output_state_in,
+                   ICLTensor *cell_state_out, ICLTensor *output_state_out);
+
+    /** Static function to check if given info will lead to a valid configuration of @ref CLLSTMLayerQuantized
+     *
+     * @param[in]  input                       Source tensor info. Input is a 2D tensor info with dimensions [input_size, batch_size]. Data types supported: QASYMM8.
+     * @param[in]  input_to_input_weights      2D weights tensor info with dimensions [input_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  input_to_forget_weights     2D weights tensor info with dimensions [input_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  input_to_cell_weights       2D weights tensor info with dimensions [input_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  input_to_output_weights     2D weights tensor info with dimensions [input_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  recurrent_to_input_weights  2D weights tensor info with dimensions [output_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  recurrent_to_forget_weights 2D weights tensor info with dimensions [output_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  recurrent_to_cell_weights   2D weights tensor info with dimensions [output_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  recurrent_to_output_weights 2D weights tensor info with dimensions [output_size, output_size]. Data type supported: Same as @p input.
+     * @param[in]  input_gate_bias             1D weights tensor info with dimensions [output_size]. Data type supported: S32.
+     * @param[in]  forget_gate_bias            1D weights tensor info with dimensions [output_size]. Data type supported: S32.
+     * @param[in]  cell_bias                   1D weights tensor info with dimensions [output_size]. Data type supported: S32.
+     * @param[in]  output_gate_bias            1D weights tensor info with dimensions [output_size]. Data type supported: S32.
+     * @param[in]  cell_state_in               2D tensor info with dimensions [output_size, batch_size]. Data type supported:  QSYMM16.
+     * @param[in]  output_state_in             2D tensor info with dimensions [output_size, batch_size]. Data type supported: Same as @p input.
+     * @param[out] cell_state_out              Destination tensor info. Output is a 2D tensor info with dimensions [output_size, batch_size]. Data type supported:  QSYMM16.
+     * @param[out] output_state_out            Destination tensor info. Output is a 2D tensor info with dimensions [output_size, batch_size].Data types supported: Same as @p input.
+     *
+     * @return a status
+     */
+    static Status validate(const ITensorInfo *input,
+                           const ITensorInfo *input_to_input_weights, const ITensorInfo *input_to_forget_weights, const ITensorInfo *input_to_cell_weights, const ITensorInfo *input_to_output_weights,
+                           const ITensorInfo *recurrent_to_input_weights, const ITensorInfo *recurrent_to_forget_weights, const ITensorInfo *recurrent_to_cell_weights, const ITensorInfo *recurrent_to_output_weights,
+                           const ITensorInfo *input_gate_bias, const ITensorInfo *forget_gate_bias, const ITensorInfo *cell_bias, const ITensorInfo *output_gate_bias,
+                           const ITensorInfo *cell_state_in, const ITensorInfo *output_state_in,
+                           const ITensorInfo *cell_state_out, const ITensorInfo *output_state_out);
+
+    // Inherited methods overridden:
+    void run() override;
+    void prepare() override;
+
+private:
+    CLMemoryGroup _memory_group;
+
+    // Functions used
+    CLGEMMLowpMatrixMultiplyCore                        _gemmlowp;
+    CLGEMMLowpQuantizeDownInt32ToInt16ScaleByFixedPoint _output_stage;
+    CLTranspose                                         _transpose_weights;
+    CLConcatenateLayer                                  _concat_input_weights;
+    CLConcatenateLayer                                  _concat_recurrent_weights;
+    CLConcatenateLayer                                  _concat_weights;
+    CLConcatenateLayer                                  _concat_inputs;
+    CLConcatenateLayer                                  _concat_bias;
+    CLActivationLayer                                   _sigmoid_forget_gate;
+    CLActivationLayer                                   _sigmoid_input_gate;
+    CLActivationLayer                                   _sigmoid_output_gate;
+    CLActivationLayer                                   _tanh_modulation_gate;
+    CLActivationLayer                                   _tanh_output_state;
+    CLArithmeticAddition                                _add_cell_state_tmps;
+    CLArithmeticAddition                                _add2;
+    CLPixelWiseMultiplication                           _mul_forget_gate_cell_state;
+    CLPixelWiseMultiplication                           _mul_input_gate_input_mod_gate;
+    CLPixelWiseMultiplication                           _mul_output_state_tmp_output_gate;
+    CLSlice                                             _slice_input_tensor;
+    CLSlice                                             _slice_forget_tensor;
+    CLSlice                                             _slice_cell_tensor;
+    CLSlice                                             _slice_output_tensor;
+    CLDequantizationLayer                               _dequantize;
+    CLQuantizationLayer                                 _quantize;
+
+    // Tensor pointers
+    const ICLTensor *_input_to_input_weights;
+    const ICLTensor *_input_to_forget_weights;
+    const ICLTensor *_input_to_cell_weights;
+    const ICLTensor *_input_to_output_weights;
+    const ICLTensor *_recurrent_to_input_weights;
+    const ICLTensor *_recurrent_to_forget_weights;
+    const ICLTensor *_recurrent_to_cell_weights;
+    const ICLTensor *_recurrent_to_output_weights;
+    const ICLTensor *_input_gate_bias;
+    const ICLTensor *_forget_gate_bias;
+    const ICLTensor *_cell_bias;
+    const ICLTensor *_output_gate_bias;
+
+    // Temporary tensors
+    CLTensor _recurrent_weights;
+    CLTensor _input_weights;
+    CLTensor _weights;
+    CLTensor _input;
+    CLTensor _weights_transposed;
+    CLTensor _output_highp;
+    CLTensor _output_lowp;
+    CLTensor _bias;
+    CLTensor _forget_gate_input;
+    CLTensor _input_gate_input;
+    CLTensor _output_gate_input;
+    CLTensor _input_modulation_gate_input;
+    CLTensor _forget_gate_output;
+    CLTensor _input_gate_output;
+    CLTensor _output_gate_output;
+    CLTensor _input_modulation_gate_output;
+    CLTensor _cell_state_tmp1;
+    CLTensor _cell_state_tmp2;
+    CLTensor _output_state_tmp;
+    CLTensor _output_state_out_symm;
+    CLTensor _output_state_out_f32;
+
+    bool _is_prepared;
+};
+} // namespace arm_compute
+#endif /* __ARM_COMPUTE_CLLSTMLAYERQUANTIZED_H__ */