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/*! \file
    \brief Default sparse GEMM with visitor.
*/

#pragma once

#include "cutlass/cutlass.h"

#include "cutlass/layout/matrix.h"
#include "cutlass/numeric_types.h"
#include "cutlass/arch/wmma.h"

#include "cutlass/epilogue/threadblock/epilogue.h"
#include "cutlass/epilogue/thread/linear_combination.h"

#include "cutlass/gemm/gemm.h"
#include "cutlass/gemm/kernel/gemm.h"
#include "cutlass/gemm/kernel/default_gemm_sparse.h"
#include "cutlass/gemm/kernel/sparse_gemm_with_visitor.h"
#include "cutlass/gemm/kernel/gemm_pipelined.h"
#include "cutlass/gemm/threadblock/default_mma_core_sm75.h"
#include "cutlass/gemm/threadblock/default_mma_core_sm70.h"
#include "cutlass/gemm/threadblock/default_mma_core_sm80.h"
#include "cutlass/gemm/threadblock/default_mma_core_sparse_sm80.h"
#include "cutlass/gemm/threadblock/default_sparse_mma.h"
#include "cutlass/gemm/threadblock/default_mma_core_simt.h"
#include "cutlass/gemm/threadblock/threadblock_swizzle.h"

#include "cutlass/epilogue/threadblock/default_epilogue_tensor_op.h"
#include "cutlass/epilogue/threadblock/default_epilogue_volta_tensor_op.h"
#include "cutlass/epilogue/threadblock/default_epilogue_simt.h"
#include "cutlass/epilogue/threadblock/epilogue_with_visitor_callbacks.h"
#include "cutlass/transform/threadblock/predicated_tile_iterator.h"

#if defined(CUTLASS_ARCH_WMMA_ENABLED)
#include "cutlass/epilogue/threadblock/default_epilogue_wmma_tensor_op.h"
#endif //CUTLASS_ARCH_WMMA_ENABLED


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

namespace cutlass {
namespace gemm {
namespace kernel {

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

template <
    /// Element type for A matrix operand
    typename ElementA,
    /// Layout type for A matrix operand
    typename LayoutA,
    /// 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,
    /// 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 FusionCallbacks,
    /// Threadblock-level swizzling operator
    typename ThreadblockSwizzle,
    /// Number of stages used in the pipelined mainloop
    int Stages,
    /// Operation performed by GEMM
    typename Operator,
    /// Number of stages used in the pipelined epilogue
    int EpilogueStages = 1>
struct DefaultSparseGemmWithVisitor;

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

/// Partial specialization for Ampere Architecture
template <
    /// Element type for A matrix operand
    typename ElementA,
    /// Layout type for A matrix operand
    typename LayoutA,
    /// 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,
    /// Access granularity of A 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,
    /// 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 FusionCallbacks,
    /// Threadblock-level swizzling operator
    typename ThreadblockSwizzle,
    /// Number of stages used in the pipelined mainloop
    int Stages,
    /// Operation performed by GEMM
    typename Operator,
    /// Number of stages used in the pipelined epilogue
    int EpilogueStages>
struct DefaultSparseGemmWithVisitor<ElementA, LayoutA, kAlignmentA, ElementB, LayoutB, kAlignmentB,
                   ElementC, LayoutC, ElementAccumulator, arch::OpClassTensorOp,
                   arch::Sm80, ThreadblockShape, WarpShape, InstructionShape,
                   FusionCallbacks, ThreadblockSwizzle, Stages, Operator,
                   EpilogueStages> {
  /// Define the threadblock-scoped matrix multiply-accumulate
  using Mma = typename cutlass::gemm::threadblock::DefaultSparseMma<
      ElementA, LayoutA, kAlignmentA, ElementB, LayoutB, kAlignmentB,
      ElementAccumulator, layout::RowMajor, arch::OpClassTensorOp, arch::Sm80,
      ThreadblockShape, WarpShape, InstructionShape, Stages,
      Operator>::ThreadblockMma;

  static constexpr int kAlignmentC = 128 / sizeof_bits<ElementC>::value;;
  using ElementEpilogue = ElementAccumulator;

  static const int kPartitionsK = ThreadblockShape::kK / WarpShape::kK;
  using EpilogueOutputOp =
      typename epilogue::thread::LinearCombination<
          ElementC, kAlignmentC,
          ElementAccumulator, ElementEpilogue>;
  using BaseEpilogue =
      typename cutlass::epilogue::threadblock::DefaultEpilogueTensorOp<
          ThreadblockShape, typename Mma::Operator, kPartitionsK,
          EpilogueOutputOp, EpilogueOutputOp::kCount>::Epilogue;

  // Define epilogue
  using Epilogue = cutlass::epilogue::threadblock::EpilogueWithVisitorCallbacks<
      BaseEpilogue,
      FusionCallbacks,
      EpilogueStages>;

  /// Define the kernel-level GEMM operator.
  using GemmKernel = kernel::SparseGemmWithEpilogueVisitor<Mma, Epilogue, ThreadblockSwizzle>;
};

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

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