Marina Kolpakova
13 years ago
parent
6cca6a4548
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2777ebb8a0
25 changed files with 515 additions and 267 deletions
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/*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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// 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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#ifndef __OPENCV_GPU_SCAN_HPP__ |
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#define __OPENCV_GPU_SCAN_HPP__ |
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enum ScanKind { EXCLUSIVE = 0, INCLUSIVE = 1 }; |
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template <ScanKind Kind, typename T, typename F> struct WarpScan |
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{ |
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__device__ __forceinline__ WarpScan() {} |
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__device__ __forceinline__ WarpScan(const WarpScan& other) { (void)other; } |
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__device__ __forceinline__ T operator()( volatile T *ptr , const unsigned int idx) |
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{ |
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const unsigned int lane = idx & 31; |
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F op; |
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if ( lane >= 1) ptr [idx ] = op(ptr [idx - 1], ptr [idx]); |
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if ( lane >= 2) ptr [idx ] = op(ptr [idx - 2], ptr [idx]); |
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if ( lane >= 4) ptr [idx ] = op(ptr [idx - 4], ptr [idx]); |
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if ( lane >= 8) ptr [idx ] = op(ptr [idx - 8], ptr [idx]); |
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if ( lane >= 16) ptr [idx ] = op(ptr [idx - 16], ptr [idx]); |
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if( Kind == INCLUSIVE ) |
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return ptr [idx]; |
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else |
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return (lane > 0) ? ptr [idx - 1] : 0; |
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} |
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__device__ __forceinline__ unsigned int index(const unsigned int tid) |
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{ |
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return tid; |
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} |
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__device__ __forceinline__ void init(volatile T *ptr){} |
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static const int warp_offset = 0; |
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typedef WarpScan<INCLUSIVE, T, F> merge; |
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}; |
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template <ScanKind Kind , typename T, typename F> struct WarpScanNoComp |
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{ |
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__device__ __forceinline__ WarpScanNoComp() {} |
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__device__ __forceinline__ WarpScanNoComp(const WarpScanNoComp& other) { (void)other; } |
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__device__ __forceinline__ T operator()( volatile T *ptr , const unsigned int idx) |
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{ |
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const unsigned int lane = threadIdx.x & 31; |
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F op; |
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ptr [idx ] = op(ptr [idx - 1], ptr [idx]); |
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ptr [idx ] = op(ptr [idx - 2], ptr [idx]); |
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ptr [idx ] = op(ptr [idx - 4], ptr [idx]); |
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ptr [idx ] = op(ptr [idx - 8], ptr [idx]); |
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ptr [idx ] = op(ptr [idx - 16], ptr [idx]); |
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if( Kind == INCLUSIVE ) |
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return ptr [idx]; |
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else |
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return (lane > 0) ? ptr [idx - 1] : 0; |
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} |
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__device__ __forceinline__ unsigned int index(const unsigned int tid) |
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{ |
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return (tid >> warp_log) * warp_smem_stride + 16 + (tid & warp_mask); |
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} |
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__device__ __forceinline__ void init(volatile T *ptr) |
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{ |
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ptr[threadIdx.x] = 0; |
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} |
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static const int warp_smem_stride = 32 + 16 + 1; |
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static const int warp_offset = 16; |
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static const int warp_log = 5; |
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static const int warp_mask = 31; |
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typedef WarpScanNoComp<INCLUSIVE, T, F> merge; |
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}; |
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template <ScanKind Kind , typename T, typename Sc, typename F> struct BlockScan |
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{ |
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__device__ __forceinline__ BlockScan() {} |
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__device__ __forceinline__ BlockScan(const BlockScan& other) { (void)other; } |
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__device__ __forceinline__ T operator()(volatile T *ptr) |
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{ |
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const unsigned int tid = threadIdx.x; |
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const unsigned int lane = tid & warp_mask; |
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const unsigned int warp = tid >> warp_log; |
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Sc scan; |
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typename Sc::merge merge_scan; |
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const unsigned int idx = scan.index(tid); |
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T val = scan(ptr, idx); |
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__syncthreads (); |
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if( warp == 0) |
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scan.init(ptr); |
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__syncthreads (); |
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if( lane == 31 ) |
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ptr [scan.warp_offset + warp ] = (Kind == INCLUSIVE) ? val : ptr [idx]; |
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__syncthreads (); |
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if( warp == 0 ) |
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merge_scan(ptr, idx); |
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__syncthreads(); |
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if ( warp > 0) |
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val = ptr [scan.warp_offset + warp - 1] + val; |
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__syncthreads (); |
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ptr[idx] = val; |
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__syncthreads (); |
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return val ; |
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} |
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static const int warp_log = 5; |
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static const int warp_mask = 31; |
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}; |
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#endif |
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