host_reorder.h

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#pragma once

#include "cutlass/coord.h"
#include "cutlass/util/host_tensor.h"
#include "cutlass/tensor_view.h"
#include "cutlass/util/tensor_view_io.h"
#include "cutlass/util/reference/host/gemm.h"

namespace cutlass {

template <int Interleaved, typename Element, typename Layout>
void reorder_column(TensorRef<Element, Layout> dest,
                    TensorRef<Element, Layout> src,
                    cutlass::gemm::GemmCoord problem_size) {
  const int InstructionShapeCol = 8;
  // 4 threads per Quad
  const int ElementsPerThread = InstructionShapeCol / 4;
  // 4 threads per Quad
  const int ReorderedElementsPerThread =
      Interleaved / 4;

  for (int n = 0; n < problem_size.n(); n++) {
    for (int k = 0; k < problem_size.k(); k++) {
      dest.at({k, (n / Interleaved) * Interleaved +
                      ((n % ReorderedElementsPerThread) / ElementsPerThread) *
                          InstructionShapeCol +
                      ((n % Interleaved) / ReorderedElementsPerThread) *
                          ElementsPerThread +
                      (n % ElementsPerThread)}) = src.at({k, n});
    }
  }
}

} // namespace cutlass