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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/gemm/kernel/gemm_with_fused_epilogue.h"
#include "cutlass/gemm/kernel/default_gemm_universal.h"

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

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

namespace cutlass {
namespace gemm {
namespace kernel {

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

template <
  /// Element type for A matrix operand
  typename ElementA_,
  /// Layout type for A matrix operand
  typename LayoutA_,
  /// Complex elementwise transformation on A operand
  ComplexTransform TransformA,
  /// Access granularity of A matrix in units of elements
  int kAlignmentA,
  /// Element type for B matrix operand
  typename ElementB_,
  /// Layout type for B matrix operand
  typename LayoutB_,
  /// Complex elementwise transformation on B operand
  ComplexTransform TransformB,
  /// Access granularity of B matrix in units of elements
  int kAlignmentB,
  /// Element type for C and D matrix operands
  typename ElementC_,
  /// Layout type for C and D matrix operands
  typename LayoutC_,
  /// Element type for internal accumulation
  typename ElementAccumulator,
  /// Operator class tag
  typename OperatorClass,
  /// Tag indicating architecture to tune for
  typename ArchTag,
  /// Threadblock-level tile size (concept: GemmShape)
  typename ThreadblockShape,
  /// Warp-level tile size (concept: GemmShape)
  typename WarpShape,
  /// Warp-level tile size (concept: GemmShape)
  typename InstructionShape,
  /// Epilogue output operator
  typename EpilogueOutputOp,
  /// Epilogue reduction operator
  typename EpilogueReductionOp,
  /// Threadblock-level swizzling operator
  typename ThreadblockSwizzle,
  /// Number of stages used in the pipelined mainloop
  int Stages,
  /// Operation performed by GEMM
  typename Operator,
  ///
  typename Enable = void
>
struct DefaultGemmWithReduction {

  using GemmBase = typename DefaultGemmUniversal<
    ElementA_, LayoutA_, TransformA, kAlignmentA,
    ElementB_, LayoutB_, TransformB, kAlignmentB,
    ElementC_, LayoutC_, ElementAccumulator,
    OperatorClass,
    ArchTag,
    ThreadblockShape,
    WarpShape,
    InstructionShape,
    EpilogueOutputOp,
    ThreadblockSwizzle,
    Stages,
    Operator,
    SharedMemoryClearOption::kClearLastStage
  >::GemmKernel;

  // Replace epilogue
  using Epilogue = typename cutlass::epilogue::threadblock::DefaultEpilogueWithReductionTensorOp<
    typename GemmBase::Epilogue::Shape,
    typename GemmBase::Epilogue::WarpMmaOperator,
    GemmBase::Epilogue::kPartitionsK,
    ElementC_,
    EpilogueOutputOp,
    EpilogueReductionOp,
    GemmBase::Epilogue::kElementsPerAccess
  >::Epilogue;

  // Compose the GEMM kernel
  using GemmKernel = GemmWithFusedEpilogue<
    typename GemmBase::Mma,
    Epilogue,
    ThreadblockSwizzle
  >;
};

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

/// Parital specialization: ArchTag = cutlass::arch::Sm70
///
///
template <
  /// Element type for A matrix operand
  typename ElementA_,
  /// Layout type for A matrix operand
  typename LayoutA_,
  /// Complex elementwise transformation on A operand
  ComplexTransform TransformA,
  /// Access granularity of A matrix in units of elements
  int kAlignmentA,
  /// Element type for B matrix operand
  typename ElementB_,
  /// Layout type for B matrix operand
  typename LayoutB_,
  /// Complex elementwise transformation on B operand
  ComplexTransform TransformB,
  /// Access granularity of B matrix in units of elements
  int kAlignmentB,
  /// Element type for C and D matrix operands
  typename ElementC_,
  /// Layout type for C and D matrix operands
  typename LayoutC_,
  /// Element type for internal accumulation
  typename ElementAccumulator,
  /// Operator class tag
  typename OperatorClass,
  /// Threadblock-level tile size (concept: GemmShape)
  typename ThreadblockShape,
  /// Warp-level tile size (concept: GemmShape)
  typename WarpShape,
  /// Warp-level tile size (concept: GemmShape)
  typename InstructionShape,
  /// Epilogue output operator
  typename EpilogueOutputOp,
  /// Epilogue reduction operator
  typename EpilogueReductionOp,
  /// Threadblock-level swizzling operator
  typename ThreadblockSwizzle,
  /// Number of stages used in the pipelined mainloop
  int Stages,
  /// Operation performed by GEMM
  typename Operator,
  ///
  typename Enable
>
struct DefaultGemmWithReduction<
  ElementA_, LayoutA_, TransformA, kAlignmentA, 
  ElementB_, LayoutB_, TransformB, kAlignmentB,
  ElementC_, LayoutC_,
  ElementAccumulator,
  OperatorClass,
  cutlass::arch::Sm70,
  ThreadblockShape,
  WarpShape,
  InstructionShape,
  EpilogueOutputOp,
  EpilogueReductionOp,
  ThreadblockSwizzle,
  Stages,
  Operator,
  Enable
  >  {

  using GemmBase = typename DefaultGemmUniversal<
    ElementA_, LayoutA_, TransformA, kAlignmentA,
    ElementB_, LayoutB_, TransformB, kAlignmentB,
    ElementC_, LayoutC_, ElementAccumulator,
    OperatorClass,
    cutlass::arch::Sm70,
    ThreadblockShape,
    WarpShape,
    InstructionShape,
    EpilogueOutputOp,
    ThreadblockSwizzle,
    Stages,
    Operator
  >::GemmKernel;

  // Replace epilogue
  using Epilogue = typename cutlass::epilogue::threadblock::DefaultEpilogueWithReductionVoltaTensorOp<
    typename GemmBase::Epilogue::Shape,
    typename GemmBase::Epilogue::WarpMmaOperator,
    GemmBase::Epilogue::kPartitionsK,
    ElementC_,
    EpilogueOutputOp,
    EpilogueReductionOp,
    GemmBase::Epilogue::kElementsPerAccess
  >::Epilogue;

  // Compose the GEMM kernel
  using GemmKernel = GemmWithFusedEpilogue<
    typename GemmBase::Mma,
    Epilogue,
    ThreadblockSwizzle
  >;
};

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

}  // namespace kernel
}  // namespace gemm
}  // namespace cutlass

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