/home/docs/checkouts/readthedocs.org/user_builds/advanced-micro-devices-hipcub/checkouts/docs-5.5.1/hipcub/include/hipcub/backend/rocprim/thread/thread_reduce.hpp Source File

/home/docs/checkouts/readthedocs.org/user_builds/advanced-micro-devices-hipcub/checkouts/docs-5.5.1/hipcub/include/hipcub/backend/rocprim/thread/thread_reduce.hpp Source File#

hipCUB: /home/docs/checkouts/readthedocs.org/user_builds/advanced-micro-devices-hipcub/checkouts/docs-5.5.1/hipcub/include/hipcub/backend/rocprim/thread/thread_reduce.hpp Source File
thread_reduce.hpp
1 /******************************************************************************
2  * Copyright (c) 2010-2011, Duane Merrill. All rights reserved.
3  * Copyright (c) 2011-2018, NVIDIA CORPORATION. All rights reserved.
4  * Modifications Copyright (c) 2017-2020, Advanced Micro Devices, Inc. All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  * * Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * * Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  * * Neither the name of the NVIDIA CORPORATION nor the
14  * names of its contributors may be used to endorse or promote products
15  * derived from this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20  * DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY
21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  ******************************************************************************/
29 
30 #ifndef HIPCUB_ROCPRIM_THREAD_THREAD_REDUCE_HPP_
31 #define HIPCUB_ROCPRIM_THREAD_THREAD_REDUCE_HPP_
32 
33 BEGIN_HIPCUB_NAMESPACE
34 
36 namespace internal {
37 
38 template <
39  int LENGTH,
40  typename T,
41  typename ReductionOp,
42  bool NoPrefix = false>
43 __device__ __forceinline__ T ThreadReduce(
44  T* input,
45  ReductionOp reduction_op,
46  T prefix = T(0))
47 {
48  T retval;
49  if(NoPrefix)
50  retval = input[0];
51  else
52  retval = prefix;
53 
54  #pragma unroll
55  for (int i = 0 + NoPrefix; i < LENGTH; ++i)
56  retval = reduction_op(retval, input[i]);
57 
58  return retval;
59 }
60 
61 template <
62  int LENGTH,
63  typename T,
64  typename ReductionOp>
65 __device__ __forceinline__ T ThreadReduce(
66  T (&input)[LENGTH],
67  ReductionOp reduction_op,
68  T prefix)
69 {
70  return ThreadReduce<LENGTH, false>((T*)input, reduction_op, prefix);
71 }
72 
73 template <
74  int LENGTH,
75  typename T,
76  typename ReductionOp>
77 __device__ __forceinline__ T ThreadReduce(
78  T (&input)[LENGTH],
79  ReductionOp reduction_op)
80 {
81  return ThreadReduce<LENGTH, true>((T*)input, reduction_op);
82 }
83 
84 }
85 
86 END_HIPCUB_NAMESPACE
87 
88 #endif
Internal namespace (to prevent ADL mishaps between static functions when mixing different CUB install...
Definition: thread_reduce.hpp:36