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/*! \file
    \brief Matrix multiply
*/

#pragma once

#include <cuda/std/cassert>
#include "cutlass/layout/matrix.h"

////////////////////////////////////////////////////////////////////////////////
namespace cutlass {
namespace arch {


////////////////////////////////////////////////////////////////////////////////
//
// WMMA template structure defines nvcuda::wmma::fragments and static assert for
// wmma native instruction sizes supported for half
//
////////////////////////////////////////////////////////////////////////////////
template <
typename Shape_, 
typename LayoutA_, 
typename LayoutB_,
typename ElementC_,
typename LayoutC_>
struct Wmma<
  Shape_,                                   ///< Size of the matrix product (concept: GemmShape)
  cutlass::half_t,                          ///< ElementA
  LayoutA_,                                 ///< LayoutA
  cutlass::half_t,                          ///< ElementB
  LayoutB_,                                 ///< LayoutB
  ElementC_,                                ///< ElementC
  LayoutC_,                                 ///< LayoutC
  cutlass::arch::OpMultiplyAdd              ///< Operator (multiply-add, xor.popc)
> {

#if defined(CUTLASS_ARCH_WMMA_SM70_ENABLED)
  using Shape = Shape_;
  using ElementA = cutlass::half_t;
  using LayoutA = LayoutA_;
  using ElementB = cutlass::half_t;
  using LayoutB = LayoutB_;
  using ElementC = ElementC_;
  using LayoutC = LayoutC_;
  using Operator = cutlass::arch::OpMultiplyAdd;
  using ArchTag = arch::Sm70;

  // check supported wmma shape for the given multiplicand data types
  static_assert(
    platform::is_same<cutlass::gemm::GemmShape<16, 16, 16>, Shape>::value ||
    platform::is_same<cutlass::gemm::GemmShape< 8, 32, 16>, Shape>::value ||
    platform::is_same<cutlass::gemm::GemmShape<32,  8, 16>, Shape>::value,
    "Supported list of wmma operator shape for f16 multiplicands are: 16x16x16, 8x32x16, and 32x8x16");

  // check supported wmma output data type for the given multiplicand data types
  static_assert(
    platform::is_same<cutlass::half_t, ElementC>::value || platform::is_same<float, ElementC>::value,
    "Supported of wmma output data type for f16 multiplicands are: f16 and f32");

  // Wmma Fragment
  using FragmentA = nvcuda::wmma::fragment<
          nvcuda::wmma::matrix_a,
          Shape::kM,
          Shape::kN,
          Shape::kK,
          typename CutlassToWmmaDataType<ElementA>::Type,
          typename CutlassToWmmaLayout<LayoutA>::Layout>;

  using FragmentB = nvcuda::wmma::fragment<
          nvcuda::wmma::matrix_b,
          Shape::kM,
          Shape::kN,
          Shape::kK,
          typename CutlassToWmmaDataType<ElementB>::Type,
          typename CutlassToWmmaLayout<LayoutB>::Layout>;

  using FragmentC = nvcuda::wmma::fragment<
          nvcuda::wmma::accumulator,
          Shape::kM,
          Shape::kN,
          Shape::kK,
          typename CutlassToWmmaDataType<ElementC>::Type>;

  /// Performs a nvcuda::wmma matrix multiply-accumulate operation
  CUTLASS_DEVICE
  void operator()(
    FragmentC &D, 
    FragmentA const &A, 
    FragmentB const &B, 
    FragmentC const &C) const {
    
      nvcuda::wmma::mma_sync(D, A, B, C);
  }
#else
    static_assert(false, "wmma.mma.sync for floating point multiplicands is avialable only for SM70 and beyond");
#endif

};

} // namespace arch
} // namespace cutlass