134 lines
3.9 KiB
C++
134 lines
3.9 KiB
C++
/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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//
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// By downloading, copying, installing or using the software you agree to this license.
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// If you do not agree to this license, do not download, install,
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// copy or use the software.
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//
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//
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// License Agreement
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// For Open Source Computer Vision Library
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//
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// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
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// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
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// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
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// Third party copyrights are property of their respective owners.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// * Redistribution's of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// * Redistribution's in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// * The name of the copyright holders may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// This software is provided by the copyright holders and contributors "as is" and
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// any express or implied warranties, including, but not limited to, the implied
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// warranties of merchantability and fitness for a particular purpose are disclaimed.
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// In no event shall the Intel Corporation or contributors be liable for any direct,
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// indirect, incidental, special, exemplary, or consequential damages
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// (including, but not limited to, procurement of substitute goods or services;
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// loss of use, data, or profits; or business interruption) however caused
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// and on any theory of liability, whether in contract, strict liability,
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// or tort (including negligence or otherwise) arising in any way out of
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// the use of this software, even if advised of the possibility of such damage.
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//
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//M*/
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#pragma once
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#ifndef OPENCV_CUDEV_WARP_SCAN_HPP
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#define OPENCV_CUDEV_WARP_SCAN_HPP
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#include "../common.hpp"
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#include "warp.hpp"
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#include "shuffle.hpp"
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namespace cv { namespace cudev {
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//! @addtogroup cudev
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//! @{
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#if __CUDACC_VER_MAJOR__ >= 9
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// Starting from CUDA 9.0, support for Fermi is dropped.
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// So CV_CUDEV_ARCH >= 300 is implied.
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template <typename T>
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__device__ T warpScanInclusive(uint mask, T data)
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{
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const uint laneId = Warp::laneId();
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// scan on shufl functions
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#pragma unroll
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for (int i = 1; i <= (WARP_SIZE / 2); i *= 2)
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{
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const T val = shfl_up_sync(mask, data, i);
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if (laneId >= i)
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data += val;
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}
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return data;
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}
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template <typename T>
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__device__ __forceinline__ T warpScanExclusive(uint mask, T data)
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{
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return warpScanInclusive(mask, data) - data;
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}
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#else // __CUDACC_VER_MAJOR__ >= 9
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template <typename T>
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__device__ T warpScanInclusive(T data, volatile T* smem, uint tid)
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{
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#if CV_CUDEV_ARCH >= 300
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CV_UNUSED(smem);
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CV_UNUSED(tid);
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const uint laneId = Warp::laneId();
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// scan on shufl functions
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#pragma unroll
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for (int i = 1; i <= (WARP_SIZE / 2); i *= 2)
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{
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const T val = shfl_up(data, i);
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if (laneId >= i)
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data += val;
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}
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return data;
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#else
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const uint laneId = Warp::laneId();
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smem[tid] = data;
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#pragma unroll
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for (int i = 1; i <= (WARP_SIZE / 2); i *= 2)
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if (laneId >= i)
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smem[tid] += smem[tid - i];
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return smem[tid];
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#endif
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}
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template <typename T>
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__device__ __forceinline__ T warpScanExclusive(T data, volatile T* smem, uint tid)
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{
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return warpScanInclusive(data, smem, tid) - data;
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}
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#endif // __CUDACC_VER_MAJOR__ >= 9
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//! @}
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}}
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#endif
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