/home/docs/checkouts/readthedocs.org/user_builds/advanced-micro-devices-hipcub/checkouts/docs-5.4.2/hipcub/include/hipcub/backend/rocprim/warp/warp_scan.hpp Source File

/home/docs/checkouts/readthedocs.org/user_builds/advanced-micro-devices-hipcub/checkouts/docs-5.4.2/hipcub/include/hipcub/backend/rocprim/warp/warp_scan.hpp Source File#

hipCUB: /home/docs/checkouts/readthedocs.org/user_builds/advanced-micro-devices-hipcub/checkouts/docs-5.4.2/hipcub/include/hipcub/backend/rocprim/warp/warp_scan.hpp Source File
 /******************************************************************************
  * Copyright (c) 2010-2011, Duane Merrill.  All rights reserved.
  * Copyright (c) 2011-2018, NVIDIA CORPORATION.  All rights reserved.
  * Modifications Copyright (c) 2017-2020, Advanced Micro Devices, Inc.  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 TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************/
  
 #ifndef HIPCUB_ROCPRIM_WARP_WARP_SCAN_HPP_
 #define HIPCUB_ROCPRIM_WARP_WARP_SCAN_HPP_
  
 #include "../../../config.hpp"
  
 #include "../util_ptx.hpp"
 #include "../thread/thread_operators.hpp"
  
 #include <rocprim/warp/warp_scan.hpp>
  
 BEGIN_HIPCUB_NAMESPACE
  
 template<
     typename T,
     int LOGICAL_WARP_THREADS = HIPCUB_DEVICE_WARP_THREADS,
     int ARCH = HIPCUB_ARCH>
 class WarpScan : private ::rocprim::warp_scan<T, LOGICAL_WARP_THREADS>
 {
     static_assert(LOGICAL_WARP_THREADS > 0, "LOGICAL_WARP_THREADS must be greater than 0");
     using base_type = typename ::rocprim::warp_scan<T, LOGICAL_WARP_THREADS>;
  
     typename base_type::storage_type &temp_storage_;
  
 public:
     using TempStorage = typename base_type::storage_type;
  
     HIPCUB_DEVICE inline
     WarpScan(TempStorage& temp_storage) : temp_storage_(temp_storage)
     {
     }
  
     HIPCUB_DEVICE inline
     void InclusiveSum(T input, T& inclusive_output)
     {
         base_type::inclusive_scan(input, inclusive_output, temp_storage_);
     }
  
     HIPCUB_DEVICE inline
     void InclusiveSum(T input, T& inclusive_output, T& warp_aggregate)
     {
         base_type::inclusive_scan(input, inclusive_output, warp_aggregate, temp_storage_);
     }
  
     HIPCUB_DEVICE inline
     void ExclusiveSum(T input, T& exclusive_output)
     {
         base_type::exclusive_scan(input, exclusive_output, T(0), temp_storage_);
     }
  
     HIPCUB_DEVICE inline
     void ExclusiveSum(T input, T& exclusive_output, T& warp_aggregate)
     {
         base_type::exclusive_scan(input, exclusive_output, T(0), warp_aggregate, temp_storage_);
     }
  
     template<typename ScanOp>
     HIPCUB_DEVICE inline
     void InclusiveScan(T input, T& inclusive_output, ScanOp scan_op)
     {
         base_type::inclusive_scan(input, inclusive_output, temp_storage_, scan_op);
     }
  
     template<typename ScanOp>
     HIPCUB_DEVICE inline
     void InclusiveScan(T input, T& inclusive_output, ScanOp scan_op, T& warp_aggregate)
     {
         base_type::inclusive_scan(
             input, inclusive_output, warp_aggregate,
             temp_storage_, scan_op
         );
     }
  
     template<typename ScanOp>
     HIPCUB_DEVICE inline
     void ExclusiveScan(T input, T& exclusive_output, ScanOp scan_op)
     {
         base_type::inclusive_scan(input, exclusive_output, temp_storage_, scan_op);
         base_type::to_exclusive(exclusive_output, exclusive_output, temp_storage_);
     }
  
     template<typename ScanOp>
     HIPCUB_DEVICE inline
     void ExclusiveScan(T input, T& exclusive_output, T initial_value, ScanOp scan_op)
     {
         base_type::exclusive_scan(
             input, exclusive_output, initial_value,
             temp_storage_, scan_op
         );
     }
  
     template<typename ScanOp>
     HIPCUB_DEVICE inline
     void ExclusiveScan(T input, T& exclusive_output, ScanOp scan_op, T& warp_aggregate)
     {
         base_type::inclusive_scan(
             input, exclusive_output, warp_aggregate, temp_storage_, scan_op
         );
         base_type::to_exclusive(exclusive_output, exclusive_output, temp_storage_);
     }
  
     template<typename ScanOp>
     HIPCUB_DEVICE inline
     void ExclusiveScan(T input, T& exclusive_output, T initial_value, ScanOp scan_op, T& warp_aggregate)
     {
         base_type::exclusive_scan(
             input, exclusive_output, initial_value, warp_aggregate,
             temp_storage_, scan_op
         );
     }
  
     template<typename ScanOp>
     HIPCUB_DEVICE inline
     void Scan(T input, T& inclusive_output, T& exclusive_output, ScanOp scan_op)
     {
         base_type::inclusive_scan(input, inclusive_output, temp_storage_, scan_op);
         base_type::to_exclusive(inclusive_output, exclusive_output, temp_storage_);
     }
  
     template<typename ScanOp>
     HIPCUB_DEVICE inline
     void Scan(T input, T& inclusive_output, T& exclusive_output, T initial_value, ScanOp scan_op)
     {
         base_type::scan(
             input, inclusive_output, exclusive_output, initial_value,
             temp_storage_, scan_op
         );
         // In CUB documentation it's unclear if inclusive_output should include initial_value,
         // however,the implementation includes initial_value in inclusive_output in WarpScan::Scan().
         // In rocPRIM it's not included, and this is a fix to match CUB implementation.
         // After confirmation from CUB's developers we will most probably change rocPRIM too.
         inclusive_output = scan_op(initial_value, inclusive_output);
     }
  
     HIPCUB_DEVICE inline
     T Broadcast(T input, unsigned int src_lane)
     {
         return base_type::broadcast(input, src_lane, temp_storage_);
     }
 };
  
 END_HIPCUB_NAMESPACE
  
 #endif // HIPCUB_ROCPRIM_WARP_WARP_SCAN_HPP_