mma_simt.h

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#pragma once

#include "cutlass/cutlass.h"
#include "cutlass/array.h"
#include "cutlass/numeric_types.h"
#include "cutlass/matrix_shape.h"
#include "cutlass/gemm/gemm.h"
#include "cutlass/gemm/warp/mma.h"

#include "cutlass/gemm/thread/mma.h"

#include "cutlass/gemm/warp/mma_simt_tile_iterator.h"
#include "cutlass/gemm/warp/mma_simt_policy.h"


namespace cutlass {
namespace gemm {
namespace warp {


template <
  typename Shape_,
  typename ElementA_,
  typename LayoutA_,
  typename ElementB_,
  typename LayoutB_,
  typename ElementC_,
  typename LayoutC_,
  typename Policy_,
  int PartitionsK = 1,
  typename Enable = bool
>
class MmaSimt {
public:
  using Shape = Shape_;

  using ElementA = ElementA_;

  using LayoutA = LayoutA_;

  using ElementB = ElementB_;

  using LayoutB = LayoutB_;

  using ElementC = ElementC_;

  using LayoutC = LayoutC_;

  using Policy = Policy_;

  using OperatorClass = arch::OpClassSimt;

  using ThreadLayoutA = typename platform::conditional< platform::is_same< layout::ColumnMajorInterleaved<4>, LayoutA >::value,
                  layout::ColumnMajor,
                  typename platform::conditional < platform::is_same< layout::RowMajorInterleaved<4>, LayoutA >::value,
                      layout::RowMajor,
                      LayoutA>::type
                 >::type;
  
  using ThreadLayoutB = typename platform::conditional< platform::is_same< layout::ColumnMajorInterleaved<4>, LayoutB >::value,
                  layout::ColumnMajor,
                  typename platform::conditional < platform::is_same< layout::RowMajorInterleaved<4>, LayoutB >::value,
                      layout::RowMajor,
                      LayoutB>::type
                 >::type;

  static constexpr bool use_dp4a = (platform::is_same< layout::ColumnMajorInterleaved<4>, LayoutA>::value || 
                                    platform::is_same< layout::RowMajorInterleaved<4>, LayoutA >::value) && 
                                    platform::is_same< ElementA, int8_t >::value && 
                                    platform::is_same< ElementB, int8_t >::value;

  using dp4a_type = typename platform::conditional< use_dp4a , int8_t, bool >::type;

  using ThreadMma = thread::Mma<
    GemmShape<
      Shape::kM / Policy::WarpShape::kRow,
      Shape::kN / Policy::WarpShape::kColumn,
      Policy::LaneMmaShape::kK>,
    ElementA,
    ThreadLayoutA,
    ElementB,
    ThreadLayoutB,
    ElementC,
    LayoutC,
    arch::OpMultiplyAdd,
    dp4a_type
  >;

public:

  using IteratorA = MmaSimtTileIterator<
    MatrixShape<Shape::kM, Policy::LaneMmaShape::kK>,
    Operand::kA,
    ElementA,
    LayoutA,
    Policy,
    PartitionsK,
    Shape::kK
  >;

  using FragmentA = typename IteratorA::Fragment;

  using IteratorB = MmaSimtTileIterator<
    MatrixShape<Policy::LaneMmaShape::kK, Shape::kN>,
    Operand::kB,
    ElementB,
    LayoutB,
    Policy,
    PartitionsK,
    Shape::kK
  >;

  using FragmentB = typename IteratorB::Fragment;

  using IteratorC = MmaSimtTileIterator<
    MatrixShape<Shape::kM, Shape::kN>,
    Operand::kC,
    ElementC,
    LayoutC,
    Policy
  >;

  using FragmentC = typename ThreadMma::FragmentC;

public:

  //
  // Methods
  //

  CUTLASS_DEVICE
  MmaSimt() {}

  CUTLASS_DEVICE
  void operator()(
    FragmentC &d, 
    FragmentA const &a, 
    FragmentB const &b, 
    FragmentC const &c, int group_idx = 0) const {

    ThreadMma mma;

    mma(d, a, b, c);
  }
};


} // namespace warp
} // namespace gemm
} // namespace cutlass