/*
 * Copyright (c) 2018-2021 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_CL_GEMMLOWP_OFFSET_CONTRIBUTION_OUTPUT_STAGE_KERNEL_H
#define ARM_COMPUTE_CL_GEMMLOWP_OFFSET_CONTRIBUTION_OUTPUT_STAGE_KERNEL_H

#include "src/core/common/Macros.h"
#include "src/gpu/cl/ClCompileContext.h"
#include "src/gpu/cl/IClKernel.h"

namespace arm_compute
{
namespace opencl
{
namespace kernels
{
/** OpenCL kernel used to add the offset contribution after the matrix multiplication and perform the output stage.
 *
 * This kernel takes a final int32 accumulator value (the output of the matrix multiplication), adds to it the offset contribution
 * of matrix A and matrix B and performs the output stage defined by the output_stage argument
 *
 * @note For quantized computations the output data type for auto-initialization must be passed as part of the @ref GEMMLowpOutputStageInfo.
 */
class ClGemmLowpOffsetContributionOutputStageKernel : public IClKernel
{
public:
    ClGemmLowpOffsetContributionOutputStageKernel();
    ARM_COMPUTE_DISALLOW_COPY_ALLOW_MOVE(ClGemmLowpOffsetContributionOutputStageKernel);
    /** Initialise the kernel's input and output.
     *
     * @param[in]  compile_context    The compile context to be used.
     * @param[in]  mm_result          Input tensor containing the result of the matrix multiplication. Data type supported: S32
     * @param[in]  vector_sum_col     Input row-vector of sums of all the entries in each column of matrix B.
     *                                Note: vector_sum_col can be a nullptr in case a_offset = 0. Data type supported: same as @p mm_result
     * @param[in]  vector_sum_row     Input row-vector of sums of all the entries in each row of matrix A.
     *                                Note: vector_sum_row can be a nullptr in case b_offset = 0. Data type supported: same as @p mm_result
     * @param[in]  bias               Biases tensor. Only shared biases supported and it can be a nullptr if the addition of biases is not required.
     *                                Biases are 1D tensor with dimensions [OFM]. Data type supported: Same as @p mm_result.
     * @param[out] dst                Destination tensor. Data type supported: QASYMM8/QASYMM8_SIGNED.
     * @param[in]  k                  Number of matrix A columns or Matrix B rows
     * @param[in]  a_offset           Offset to be added to each element of the matrix A.
     * @param[in]  b_offset           Offset to be added to each element of the matrix B.
     * @param[in]  output_stage       GEMMLowp output stage info
     * @param[in]  output_multipliers Output multipliers tensor. In case of per-channel quantization, the number of multipliers must be equal to the number of filters (OFM).
     *                                Supported data types: S32
     * @param[in]  output_shifts      Output shifts tensor. In case of per-channel quantization, the number of multipliers must be equal to the number of filters (OFM).
     *                                Supported data types: S32
     */
    void configure(const CLCompileContext        &compile_context,
                   const ITensorInfo             *mm_result,
                   const ITensorInfo             *vector_sum_col,
                   const ITensorInfo             *vector_sum_row,
                   const ITensorInfo             *bias,
                   ITensorInfo                   *dst,
                   int32_t                        k,
                   int32_t                        a_offset,
                   int32_t                        b_offset,
                   const GEMMLowpOutputStageInfo &output_stage,
                   const ITensorInfo             *output_multipliers,
                   const ITensorInfo             *output_shifts);
    /** Static function to check if given info will lead to a valid configuration
     *
     * Similar to @ref ClGemmLowpOffsetContributionOutputStageKernel::configure()
     *
     * @return a status
     */
    static Status validate(const ITensorInfo             *mm_result,
                           const ITensorInfo             *vector_sum_col,
                           const ITensorInfo             *vector_sum_row,
                           const ITensorInfo             *bias,
                           const ITensorInfo             *dst,
                           int32_t                        a_offset,
                           int32_t                        b_offset,
                           const GEMMLowpOutputStageInfo &output_stage,
                           const ITensorInfo             *output_multipliers,
                           const ITensorInfo             *output_shifts);

    // Inherited methods overridden:
    void run_op(ITensorPack &tensors, const Window &window, cl::CommandQueue &queue) override;

private:
    bool _is_quantized_per_channel{false};
};
} // namespace kernels
} // namespace opencl
} // namespace arm_compute
#endif /* ARM_COMPUTE_CL_GEMMLOWP_OFFSET_CONTRIBUTION_OUTPUT_STAGE_KERNEL_H */