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/*! \file
  \brief 
    Defines a GEMM with Reduction based on an existing UniversalGemm kernel.

*/

#pragma once

#include "cutlass/cutlass.h"

#include "cutlass/conv/kernel/default_conv2d_fprop.h"
#include "cutlass/conv/kernel/implicit_gemm_convolution_with_fused_epilogue.h"

#include "cutlass/epilogue/threadblock/default_epilogue_with_reduction.h"
#include "cutlass/epilogue/threadblock/epilogue_with_reduction.h"

/////////////////////////////////////////////////////////////////////////////////////////////////

namespace cutlass {
namespace conv {
namespace kernel {

/////////////////////////////////////////////////////////////////////////////////////////////////

template <
  typename ElementA,
  typename LayoutA,
  typename ElementB,
  typename LayoutB,
  typename ElementC,
  typename LayoutC,
  typename ElementAccumulator,
  typename OperatorClass,
  typename ArchTag,
  typename ThreadblockShape,
  typename WarpShape,
  typename InstructionShape,
  typename EpilogueOutputOp,
  typename EpilogueReductionOp,
  typename ThreadblockSwizzle,
  int Stages,
  typename MathOperatorTag,
  conv::IteratorAlgorithm IteratorAlgorithm = IteratorAlgorithm::kOptimized,
  conv::StrideSupport StrideSupport = StrideSupport::kStrided,
  /// Access granularity of A matrix in units of elements
  int AlignmentA = 128 / cutlass::sizeof_bits<ElementA>::value,
  /// Access granularity of B matrix in units of elements
  int AlignmentB = 128 / cutlass::sizeof_bits<ElementB>::value
>
struct DefaultConv2dFpropWithReduction {

  using ImplicitGemmBase = typename DefaultConv2dFprop<
    ElementA, LayoutA,
    ElementB, LayoutB,
    ElementC, LayoutC,
    ElementAccumulator,
    OperatorClass,
    ArchTag,
    ThreadblockShape,
    WarpShape,
    InstructionShape,
    EpilogueOutputOp,
    ThreadblockSwizzle,
    Stages,
    MathOperatorTag,
    IteratorAlgorithm,
    StrideSupport,
    AlignmentA,
    AlignmentB
  >::Kernel;

  // Replace epilogue
  using Epilogue = typename cutlass::conv::kernel::detail::DefaultConvEpilogueWithReductionTensorOp<
    ArchTag,
    typename ImplicitGemmBase::Epilogue::Shape,
    typename ImplicitGemmBase::Epilogue::WarpMmaOperator,
    ImplicitGemmBase::Epilogue::kPartitionsK,
    ElementC,
    EpilogueOutputOp,
    EpilogueReductionOp,
    ImplicitGemmBase::Epilogue::kElementsPerAccess
  >::Epilogue;

  // Define the kernel
  using Kernel = cutlass::conv::kernel::ImplicitGemmConvolutionWithFusedEpilogue<
    typename ImplicitGemmBase::Mma,
    Epilogue,
    ThreadblockSwizzle,
    conv::Operator::kFprop
  >;
};

/////////////////////////////////////////////////////////////////////////////////////////////////

}  // namespace kernel
}  // namespace conv
}  // namespace cutlass

/////////////////////////////////////////////////////////////////////////////////////////////////
