linear_scaling.h

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#pragma once

#include <cutlass/fragment_multiply_add.h>

namespace cutlass {
namespace gemm {


template <typename Scalar_, typename FragmentMultiplyAdd_ = FragmentMultiplyAdd<Scalar_> >
struct LinearScaling {
  // The scalar.
  typedef Scalar_ Scalar;
  // The adapater.
  typedef FragmentMultiplyAdd_ FragmentMultiplyAdd;

  struct Params {
    Scalar alpha, beta;

    template <typename GemmDesc_>
    CUTLASS_HOST_DEVICE int initialize(GemmDesc_ const& desc) {
      alpha = desc.alpha;
      beta = desc.beta;
      return 0;
    }
  };

  CUTLASS_DEVICE LinearScaling(Params const& params) : alpha(params.alpha), beta(params.beta) {}

  template <typename Fragment_>
  CUTLASS_DEVICE void evaluate(Fragment_ const& accum, Fragment_& output) {
    FragmentMultiplyAdd mad;
    mad.multiply(alpha, accum, output);
  }

  template <typename Fragment_>
  CUTLASS_DEVICE void evaluate(Fragment_ const& accum, Fragment_ const& old, Fragment_& output) {
    FragmentMultiplyAdd mad;
    Fragment_ tmp;
    mad.multiply(beta, old, tmp);
    mad.multiply_add(alpha, accum, tmp, output);
  }

  Scalar alpha, beta;
};


}  // namespace gemm
}  // namespace cutlass