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102 lines
3.6 KiB
C++
102 lines
3.6 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_BLOCK_SCAN_HPP__
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#define __OPENCV_CUDEV_BLOCK_SCAN_HPP__
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#include "../common.hpp"
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#include "../warp/scan.hpp"
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namespace cv { namespace cudev {
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template <int THREADS_NUM, typename T>
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__device__ T blockScanInclusive(T data, volatile T* smem, uint tid)
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{
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if (THREADS_NUM > WARP_SIZE)
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{
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// bottom-level inclusive warp scan
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T warpResult = warpScanInclusive(data, smem, tid);
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__syncthreads();
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// save top elements of each warp for exclusive warp scan
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// sync to wait for warp scans to complete (because s_Data is being overwritten)
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if ((tid & (WARP_SIZE - 1)) == (WARP_SIZE - 1))
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{
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smem[tid >> LOG_WARP_SIZE] = warpResult;
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}
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__syncthreads();
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if (tid < (THREADS_NUM / WARP_SIZE))
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{
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// grab top warp elements
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T val = smem[tid];
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// calculate exclusive scan and write back to shared memory
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smem[tid] = warpScanExclusive(val, smem, tid);
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}
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__syncthreads();
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// return updated warp scans with exclusive scan results
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return warpResult + smem[tid >> LOG_WARP_SIZE];
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}
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else
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{
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return warpScanInclusive(data, smem, tid);
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}
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}
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template <int THREADS_NUM, typename T>
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__device__ __forceinline__ T blockScanExclusive(T data, volatile T* smem, uint tid)
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{
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return blockScanInclusive<THREADS_NUM>(data, smem, tid) - data;
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}
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}}
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#endif
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