/*
 * Copyright (c) 2018-2020 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_CLGEMMRESHAPERHSMATRIXKERNEL_H
#define ARM_COMPUTE_CLGEMMRESHAPERHSMATRIXKERNEL_H

#include "arm_compute/core/CL/ICLKernel.h"

namespace arm_compute
{
class ICLTensor;

/** OpenCL kernel to reshape the RHS matrix when performing the matrix multiplication
 *  In particular, this kernel splits the input matrix in blocks of size K0xN0 and stores each one in
 *  the output matrix unrolling the values */
class CLGEMMReshapeRHSMatrixKernel : public ICLKernel
{
public:
    /** Default constructor */
    CLGEMMReshapeRHSMatrixKernel();
    /** Prevent instances of this class from being copied (As this class contains pointers) */
    CLGEMMReshapeRHSMatrixKernel(const CLGEMMReshapeRHSMatrixKernel &) = delete;
    /** Prevent instances of this class from being copied (As this class contains pointers) */
    CLGEMMReshapeRHSMatrixKernel &operator=(const CLGEMMReshapeRHSMatrixKernel &) = delete;
    /** Allow instances of this class to be moved */
    CLGEMMReshapeRHSMatrixKernel(CLGEMMReshapeRHSMatrixKernel &&) = default;
    /** Allow instances of this class to be moved */
    CLGEMMReshapeRHSMatrixKernel &operator=(CLGEMMReshapeRHSMatrixKernel &&) = default;
    /** Initialise the kernel's input and output.
     *
     * @note If rhs_info.export_to_cl_image = true, this OpenCL kernel will guarantee the OpenCL pitch alignment for the output tensor,
     *       required to create a OpenCL image object from buffer in @ref CLGEMMMatrixMultiplyReshapedKernel and in @ref CLGEMMMatrixMultiplyReshapedOnlyRHSKernel
     *       Since the OpenCL image object is created importing the OpenCL buffer, the following conditions are required:
     *       -# rhs_info.n0 can only be 4, 8 and 16
     *       -# rhs_info.k0 can only be 4, 8 and 16
     *       -# Data type can only be F32, F16
     *       -# The platform should support the OpenCL cl_khr_image2d_from_buffer extension
     *       -# output width should be less or equal to (CL_DEVICE_IMAGE2D_MAX_WIDTH * 4)
     *       -# output (height * depth) should be less or equal to CL_DEVICE_IMAGE2D_MAX_HEIGHT
     *       -# The output tensor should be only consumed by @ref CLGEMMMatrixMultiplyReshapedKernel or @ref CLGEMMMatrixMultiplyReshapedOnlyRHSKernel
     *
     * @param[in]  input    Input tensor. Data types supported: All
     * @param[out] output   Output tensor. Data type supported: same as @p input
     * @param[in]  rhs_info RHS matrix information to be used for reshaping. This object contains all the necessary
     *                      information to reshape the input tensor. Only the following values are supported:
     *                      rhs_info.n0: 2,3,4,8,16 (only 4, 8 and 16 if rhs_info.export_to_cl_image == true)
     *                      rhs_info.k0: 1,2,3,4,8,16 (k0 = 1 only if rhs_info.transpose = false), (only 4, 8 and 16 if rhs_info.export_to_cl_image == true)
     *                      rhs_info.h0: greater than 0
     *                      rhs_info.transpose: true, false
     *                      rhs_info.interleave: true, false
     */
    void configure(const ICLTensor *input, ICLTensor *output, const GEMMRHSMatrixInfo &rhs_info);
    /** Initialise the kernel's input and output.
     *
     * @note If rhs_info.export_to_cl_image = true, this OpenCL kernel will guarantee the OpenCL pitch alignment for the output tensor,
     *       required to create a OpenCL image object from buffer in @ref CLGEMMMatrixMultiplyReshapedKernel and in @ref CLGEMMMatrixMultiplyReshapedOnlyRHSKernel
     *       Since the OpenCL image object is created importing the OpenCL buffer, the following conditions are required:
     *       -# rhs_info.n0 can only be 4, 8 and 16
     *       -# rhs_info.k0 can only be 4, 8 and 16
     *       -# Data type can only be F32, F16
     *       -# The platform should support the OpenCL cl_khr_image2d_from_buffer extension
     *       -# output width should be less or equal to (CL_DEVICE_IMAGE2D_MAX_WIDTH * 4)
     *       -# output (height * depth) should be less or equal to CL_DEVICE_IMAGE2D_MAX_HEIGHT
     *       -# The output tensor should be only consumed by @ref CLGEMMMatrixMultiplyReshapedKernel or @ref CLGEMMMatrixMultiplyReshapedOnlyRHSKernel
     *
     * @param[in]  compile_context The compile context to be used.
     * @param[in]  input           Input tensor. Data types supported: All
     * @param[out] output          Output tensor. Data type supported: same as @p input
     * @param[in]  rhs_info        RHS matrix information to be used for reshaping. This object contains all the necessary
     *                             information to reshape the input tensor. Only the following values are supported:
     *                             rhs_info.n0: 2,3,4,8,16 (only 4, 8 and 16 if rhs_info.export_to_cl_image == true)
     *                             rhs_info.k0: 1,2,3,4,8,16 (k0 = 1 only if rhs_info.transpose = false), (only 4, 8 and 16 if rhs_info.export_to_cl_image == true)
     *                             rhs_info.h0: greater than 0
     *                             rhs_info.transpose: true, false
     *                             rhs_info.interleave: true, false
     */
    void configure(const CLCompileContext &compile_context, const ICLTensor *input, ICLTensor *output, const GEMMRHSMatrixInfo &rhs_info);
    /** Static function to check if given info will lead to a valid configuration of @ref CLGEMMReshapeRHSMatrixKernel
     *
     * @note If rhs_info.export_to_cl_image = true, this OpenCL kernel will guarantee the OpenCL pitch alignment for the output tensor,
     *       required to create a OpenCL image object from buffer in @ref CLGEMMMatrixMultiplyReshapedKernel and in @ref CLGEMMMatrixMultiplyReshapedOnlyRHSKernel
     *       Since the OpenCL image object is created importing the OpenCL buffer, the following conditions are required:
     *       -# rhs_info.n0 can only be 4, 8 and 16
     *       -# rhs_info.k0 can only be 4, 8 and 16
     *       -# Data type can only be F32, F16
     *       -# The platform should support the OpenCL cl_khr_image2d_from_buffer extension
     *       -# output width should be less or equal to (CL_DEVICE_IMAGE2D_MAX_WIDTH * 4)
     *       -# output (height * depth) should be less or equal to CL_DEVICE_IMAGE2D_MAX_HEIGHT
     *       -# The output tensor should be only consumed by @ref CLGEMMMatrixMultiplyReshapedKernel or @ref CLGEMMMatrixMultiplyReshapedOnlyRHSKernel
     *
     * @param[in] input    Input tensor info. Data types supported: All
     * @param[in] output   Output tensor info which stores the interleaved matrix. Data type supported: same as @p input.
     * @param[in] rhs_info RHS matrix information to be used for reshaping. This object contains all the necessary
     *                     information to reshape the input tensor. Only the following values are supported:
     *                     rhs_info.n0: 2,3,4,8,16 (only 4, 8 and 16 if rhs_info.export_to_cl_image == true)
     *                     rhs_info.k0: 1,2,3,4,8,16 (k0 = 1 only if rhs_info.transpose = false),(only 4, 8 and 16 if rhs_info.export_to_cl_image == true)
     *                     rhs_info.h0: greater than 0
     *                     rhs_info.transpose: true, false
     *                     rhs_info.interleave: true, false
     *
     * @return a status
     */
    static Status validate(const ITensorInfo *input, const ITensorInfo *output, const GEMMRHSMatrixInfo &rhs_info);

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

private:
    const ICLTensor *_input;
    ICLTensor       *_output;
};
} // namespace arm_compute
#endif /* ARM_COMPUTE_CLGEMMRESHAPERHSMATRIXKERNEL_H */