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/*! \file
    \brief Defines common types used for all GEMM-like operators.
*/
#pragma once

#include "cutlass/cutlass.h"
#include "cutlass/coord.h"
#include "cutlass/gemm_coord.h"
#include "cutlass/layout/matrix.h"
#include "cute/layout.hpp"
#include "cutlass/detail/layout.hpp"

namespace cutlass {
namespace gemm {

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

/// GEMM operand enumeration: D = A * B + C
enum class Operand {
  kA, /// A multiplicand
  kB, /// B multiplicand
  kC, /// Source accumulator
  kD  /// Destination accumulator
};

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

enum class GemmUniversalMode {
  kGemm,
  kGemmSplitKParallel,
  kBatched,
  kArray,
  kInvalid
};

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

/// Some options for clearing shared memory
enum class SharedMemoryClearOption {
  kNone,            ///< SMEM is in don't-care state
  kZfill,           ///< Kernels fill out of bounds accesses with zeros
  kClearLastStage   ///< Last SMEM stage is explicitly cleared. Mainloop uses 'kNone'
};

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

using cutlass::detail::TagToStrideA;
using cutlass::detail::TagToStrideB;
using cutlass::detail::TagToStrideC;
using cutlass::detail::TagToStrideA_t;
using cutlass::detail::TagToStrideB_t;
using cutlass::detail::TagToStrideC_t;

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

namespace detail {

using cutlass::detail::StrideToLayoutTagA;
using cutlass::detail::StrideToLayoutTagB;
using cutlass::detail::StrideToLayoutTagC;
using cutlass::detail::StrideToLayoutTagA_t;
using cutlass::detail::StrideToLayoutTagB_t;
using cutlass::detail::StrideToLayoutTagC_t;

template<int ModeIndex, class Stride>
constexpr bool
is_major(Stride = {}) {
  return ::cutlass::detail::is_major<ModeIndex, Stride>();
}

template<class Stride>
constexpr bool
is_mn_major() {
  return is_major<0,Stride>();
}

template<class Stride>
constexpr
bool
is_k_major() {
  return is_major<1,Stride>();
}

template<class LayoutA>
constexpr bool
is_mn_major_A() {
  return is_mn_major<TagToStrideA_t<LayoutA>>();
}

template<class LayoutB>
constexpr bool
is_mn_major_B() {
  return is_mn_major<TagToStrideB_t<LayoutB>>();
}

template<class LayoutA>
constexpr bool
is_k_major_A() {
  return is_k_major<TagToStrideA_t<LayoutA>>();
}

template<class LayoutB>
constexpr bool
is_k_major_B() {
  return is_k_major<TagToStrideB_t<LayoutB>>();
}

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

// The following two metafunctions are used to detect whether a `kernel::Gemm` or `kernel::GemmUniversal`
// is implementing the CUTLASS 3.x API or not, by checking if the problem shape type is aliased within or not.
template <class GemmKernel, class = void>
struct IsCutlass3GemmKernel : cute::false_type { };

template <typename GemmKernel>
struct IsCutlass3GemmKernel<GemmKernel, cute::void_t<typename GemmKernel::ProblemShape>>
    : cute::true_type { };

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

} // namespace detail

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

} // namespace gemm
} // namespace cutlass

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