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/*! \file
  \brief Functor performing linear combination with GELU operations used by epilogues.
*/

#pragma once

#include "cutlass/cutlass.h"
#include "cutlass/epilogue/thread/activation.h"
#include "cutlass/epilogue/thread/linear_combination_generic.h"

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

namespace cutlass {
namespace epilogue {
namespace thread {

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

/// Applies a linear combination operator followed by the GELU activation to an array of elements.
///
/// D = gelu(alpha * accumulator + beta * source + uniform)
///
template <
  typename ElementOutput_,                             ///< Data type used to load and store tensors
  int Count,                                           ///< Number of elements computed per operation
                                                       ///< Usually it is 128/sizeof_bits<ElementOutput_>,
                                                       ///< but we use 64 or 32 sometimes when there are not enough data to store
  typename ElementAccumulator_ = ElementOutput_,       ///< Accumulator data type
  typename ElementCompute_ = ElementOutput_,           ///< Data type used to compute linear combination
  ScaleType::Kind Scale = ScaleType::Default,          ///< Control Alpha and Beta scaling
  FloatRoundStyle Round = FloatRoundStyle::round_to_nearest
>
using LinearCombinationGELU = LinearCombinationGeneric<GELU, ElementOutput_, Count, ElementAccumulator_,
                                                       ElementCompute_, Scale, Round, true>;

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

} // namespace thread
} // namespace epilogue
} // namespace cutlass
