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/*!
  \file
  \brief Defines conversion operations among Fragments of different base type.
*/
#pragma once

#include <cutlass/fragment.h>

namespace cutlass {

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

template <typename InputFragment_, typename OutputFragment_>
struct Convert {};

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

template <typename InputScalar_, typename OutputScalar_, int kScalars_>
struct Convert<Fragment<InputScalar_, kScalars_>, Fragment<OutputScalar_, kScalars_> > {
  /// The input fragment.
  typedef Fragment<InputScalar_, kScalars_> InputFragment;
  /// The output fragment.
  typedef Fragment<OutputScalar_, kScalars_> OutputFragment;

  /// Ctor.
  CUTLASS_DEVICE Convert() {}

  /// Transform a fragment.
  CUTLASS_DEVICE void transform(InputFragment const& src, OutputFragment& dst) {
    transform(src, 0, dst);
  }

  /// Transform a fragment.
  template <typename Fragment_>
  CUTLASS_DEVICE void transform(Fragment_ const& src, int offset, OutputFragment& dst) {
    for (int i = 0; i < kScalars_; ++i) {
      dst[i] = static_cast<OutputScalar_>(src[i + offset]);
    }
  }
};

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

template <typename Fragment_>
struct Copy {
  /// The input fragment.
  typedef Fragment_ InputFragment;
  /// The output fragment.
  typedef Fragment_ OutputFragment;

  /// Ctor.
  CUTLASS_DEVICE Copy() {}

  /// Transform a fragment.
  CUTLASS_DEVICE void transform(Fragment_ const& src, Fragment_& dst) { transform(src, 0, dst); }

  /// Transform a fragment.
  template <typename InputFragment_>
  CUTLASS_DEVICE void transform(InputFragment_ const& src, int offset, Fragment_& dst) {
    if (sizeof(typename Fragment_::Element) == 8) {
      uint64_t const* src_ptr = reinterpret_cast<uint64_t const*>(&src[offset]);
      uint64_t* dst_ptr = reinterpret_cast<uint64_t*>(&dst[0]);
      for (int i = 0; i < sizeof(Fragment_) / 8; ++i) {
        dst_ptr[i] = src_ptr[i];
      }
    } else {
      uint32_t const* src_ptr = reinterpret_cast<uint32_t const*>(&src[offset]);
      uint32_t* dst_ptr = reinterpret_cast<uint32_t*>(&dst[0]);
      for (int i = 0; i < sizeof(Fragment_) / 4; ++i) {
        dst_ptr[i] = src_ptr[i];
      }
    }
  }
};

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

}  // namespace cutlass