text: /*
   * 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.
   */
  #include "arm_compute/core/CL/kernels/CLReverseKernel.h"
  
  #include "arm_compute/core/CL/CLHelpers.h"
  #include "arm_compute/core/CL/CLKernelLibrary.h"
  #include "arm_compute/core/CL/CLValidate.h"
  #include "arm_compute/core/CL/ICLTensor.h"
  #include "arm_compute/core/Error.h"
  #include "arm_compute/core/Helpers.h"
  #include "arm_compute/core/TensorInfo.h"
  #include "arm_compute/core/Window.h"
  #include "support/StringSupport.h"
  
  namespace arm_compute
  {
  namespace
  {
  Status validate_arguments(const ITensorInfo *input, const ITensorInfo *output, const ITensorInfo *axis)
  {
      ARM_COMPUTE_ERROR_ON_NULLPTR(input, output, axis);
      ARM_COMPUTE_RETURN_ERROR_ON_F16_UNSUPPORTED(input);
      ARM_COMPUTE_RETURN_ERROR_ON(input->data_type() == DataType::UNKNOWN);
      ARM_COMPUTE_RETURN_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(axis, 1, DataType::U32);
      ARM_COMPUTE_RETURN_ERROR_ON_MSG(axis->num_dimensions() > 1, "Axis must be a 1D tensor");
      ARM_COMPUTE_RETURN_ERROR_ON_MSG(axis->dimension(0) > 4, "Only up to 4 dimensions can be reversed");
  
      // Checks performed when output is configured
      if(output->total_size() != 0)
      {
          ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_SHAPES(input, output);
          ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_TYPES(input, output);
          ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_QUANTIZATION_INFO(input, output);
      }
  
      return Status{};
  }
  } // namespace
  
  CLReverseKernel::CLReverseKernel()
      : _input(nullptr), _output(nullptr), _axis(nullptr)
  {
  }
  
  void CLReverseKernel::configure(const ICLTensor *input, ICLTensor *output, const ICLTensor *axis)
  {
      configure(CLKernelLibrary::get().get_compile_context(), input, output, axis);
  }
  
  void CLReverseKernel::configure(const CLCompileContext &compile_context, const ICLTensor *input, ICLTensor *output, const ICLTensor *axis)
  {
      ARM_COMPUTE_ERROR_ON_NULLPTR(input, output, axis);
  
      _input  = input;
      _output = output;
      _axis   = axis;
  
      // Output tensor auto initialization if not yet initialized
      auto_init_if_empty(*output->info(), *input->info()->clone());
  
      ARM_COMPUTE_ERROR_THROW_ON(validate_arguments(input->info(), output->info(), axis->info()));
  
      // Set kernel build options
      CLBuildOptions build_opts;
      build_opts.add_option("-DNUM_REVERSE_DIMS=" + support::cpp11::to_string(axis->info()->dimension(0)));
      build_opts.add_option("-DDATA_TYPE=" + get_cl_unsigned_type_from_element_size(input->info()->element_size()));
  
      // Create kernel
      _kernel = create_kernel(compile_context, "reverse", build_opts.options());
  
      // Set static kernel arguments
      unsigned int idx = 2 * num_arguments_per_4D_tensor() + num_arguments_per_1D_tensor();
      add_argument<cl_uint>(idx, input->info()->dimension(0));
      add_argument<cl_uint>(idx, input->info()->dimension(1));
      add_argument<cl_uint>(idx, input->info()->dimension(2));
      add_argument<cl_uint>(idx, input->info()->dimension(3));
  
      // Configure kernel window
      Window win = calculate_max_window(*output->info(), Steps());
      ICLKernel::configure_internal(win);
  
      // Set config_id for enabling LWS tuning
      _config_id += "reverse_";
      _config_id += lower_string(string_from_data_type(input->info()->data_type()));
      _config_id += "_";
      _config_id += support::cpp11::to_string(input->info()->dimension(0));
      _config_id += "_";
      _config_id += support::cpp11::to_string(input->info()->dimension(1));
      _config_id += "_";
      _config_id += support::cpp11::to_string(input->info()->dimension(2));
  }
  
  Status CLReverseKernel::validate(const ITensorInfo *input, const ITensorInfo *output, const ITensorInfo *axis)
  {
      ARM_COMPUTE_RETURN_ON_ERROR(validate_arguments(input, output, axis));
      return Status{};
  }
  
  void CLReverseKernel::run(const Window &window, cl::CommandQueue &queue)
  {
      ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
      ARM_COMPUTE_ERROR_ON_INVALID_SUBWINDOW(ICLKernel::window(), window);
  
      Window collapsed  = window.collapse(ICLKernel::window(), Window::DimZ);
      Window slice      = collapsed.first_slice_window_4D();
      Window axis_slice = collapsed.first_slice_window_1D();
  
      do
      {
          unsigned int idx = 0;
          add_4D_tensor_argument(idx, _input, slice);
          add_1D_tensor_argument(idx, _axis, axis_slice);
          add_4D_tensor_argument(idx, _output, slice);
          enqueue(queue, *this, slice, lws_hint());
      }
      while(collapsed.slide_window_slice_4D(slice));
  }
  } // namespace arm_compute
  