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/*! \file
  \brief 

*/

#pragma once

#include "predicated_tile_iterator.h"
#include "cutlass/gemm/gemm.h"
#include "cutlass/layout/pitch_linear.h"

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

namespace cutlass {
namespace epilogue {
namespace threadblock {

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

/// Defines the optimal thread map for Wmma TensorOp accumulator layouts
template <
  typename ThreadblockShape_,
  typename WarpShape_,
  typename InstructionShape_,
  int PartitionsK,
  typename Element_,
  int ElementsPerAccess
>
struct DefaultThreadMapWmmaTensorOp {

  using ThreadblockShape = ThreadblockShape_;
  using WarpShape = WarpShape_;
  using InstructionShape = InstructionShape_;
  static int const kPartitionsK = PartitionsK;
  using Element = Element_;
  static int const kElementsPerAccess = ElementsPerAccess;

  //
  // Definitions
  //

  struct Detail {

    /// Wmma Tensor Operations fundamentally perform operations on InstructionShape::kM rows
    static int const kTensorOpRows = InstructionShape::kM;
    static int const kWarpSize = 32;

    static_assert(
      !(ThreadblockShape::kM % WarpShape::kM) &&
      !(ThreadblockShape::kN % WarpShape::kN), "Divisibility");

    /// Number of warps
    using WarpCount = gemm::GemmShape<
      ThreadblockShape::kM / WarpShape::kM,
      ThreadblockShape::kN / WarpShape::kN,
      kPartitionsK
    >;

    /// Number of participating threads
    static int const kThreads = WarpCount::kCount * kWarpSize;
  };

  //
  // ThreadMap
  //
  
  /// ThreadMap to be used by epilogue::PredicatedTileIterator satisfying concept OutputTileThreadMap
  using Type = OutputTileOptimalThreadMap <
    OutputTileShape<ThreadblockShape::kN, Detail::kTensorOpRows, Detail::WarpCount::kM, 1, 1>,
    OutputTileShape<1, WarpShape::kM / Detail::kTensorOpRows, 1, 1, WarpShape::kM / Detail::kTensorOpRows>,
    Detail::kThreads,
    kElementsPerAccess,
    sizeof_bits<Element>::value
  >;
};

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

} // namespace threadblock
} // namespace epilogue
} // namespace cutlass

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