simt_policy.h

Go to the documentation of this file.

/***************************************************************************************************
 * Copyright (c) 2017-2019, NVIDIA CORPORATION.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright notice, this list of
 *       conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *     * Neither the name of the NVIDIA CORPORATION nor the names of its contributors may be used
 *       to endorse or promote products derived from this software without specific prior written
 *       permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TOR (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 **************************************************************************************************/
#pragma once

#include "cutlass/matrix_shape.h"
#include "cutlass/layout/matrix.h"


namespace cutlass {
namespace epilogue {
namespace warp {


template <
  typename WarpShape,            
  typename Operator,             
  typename Layout,               
  typename MmaSimtPolicy         
>
struct SimtPolicy;


template <
  typename WarpShape_,           
  typename Operator_,            
  typename MmaSimtPolicy_        
>
struct SimtPolicy<WarpShape_, Operator_, layout::RowMajor, MmaSimtPolicy_> {

  using WarpShape = WarpShape_;
  using Operator = Operator_;
  using MmaSimtPolicy = MmaSimtPolicy_;

  static_assert(!(WarpShape::kM % MmaSimtPolicy::WarpShape::kRow), "Divisibility");
  static_assert(!(WarpShape::kN % MmaSimtPolicy::WarpShape::kColumn), "Divisibility");

  static int const kIterations = WarpShape::kM / MmaSimtPolicy::WarpShape::kRow;

  static int const kElementsPerIteration = 
    (WarpShape::kN / MmaSimtPolicy::WarpShape::kColumn);

  static int const kAccumulatorElementCount = kElementsPerIteration * kIterations;

  static int const kElementsPerAccess = MmaSimtPolicy::LaneMmaShape::kN;

  static int const kRowsPerIteration = MmaSimtPolicy::WarpShape::kRow;

  static int const kAccessesPerIteration = kElementsPerIteration / kElementsPerAccess;
};


} // namespace warp
} // namespace epilogue
} // namespace cutlass