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/*! \file
    \brief 
      Default kernel-level GEMM definitions combine threadblock-scoped matrix multiply-add with
      the appropriate threadblock-scoped epilogue.
  
      Note, HYTLASS epilogues universally target row-major outputs. Column-major outputs are
      accommodated by exchanging A and B operands and assuming transposed layouts. Partial
      specializations here choose 'device::GemmTransposed' to implement this functionality.
*/

#pragma once

#include "hytlass/hytlass.h"
#include "hytlass/gemm/kernel/default_gemm.h"
#include "hytlass/gemm/kernel/gemm_splitk_parallel.h"

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

namespace hytlass {
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 EpilogueOutputOp,
  /// Threadblock-level swizzling operator
  typename ThreadblockSwizzle,
  /// Number of stages used in the pipelined mainloop
  int Stages,
  /// Operation performed by GEMM
  typename Operator
>
struct DefaultGemmSplitKParallel {

  /// Define the threadblock-scoped matrix multiply-accumulate using the basic GEMM's
  /// mainloop.
  using Default = DefaultGemm<
    ElementA_,
    LayoutA_,
    kAlignmentA,
    ElementB_,
    LayoutB_,
    kAlignmentB,
    ElementAccumulator,
    LayoutC_,
    ElementAccumulator,
    OperatorClass,
    ArchTag,
    ThreadblockShape,
    WarpShape,
    InstructionShape,
    EpilogueOutputOp,
    ThreadblockSwizzle,
    Stages,
    false,
    Operator
  >;

  /// Define the matrix multiply operator
  using Mma = typename Default::Mma;

  /// Define the epilogue
  using Epilogue = typename Default::Epilogue;

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

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

}  // namespace kernel
}  // namespace gemm
}  // namespace hytlass

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