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Merge branch 'work'

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This commit is contained in:
Marina Kolpakova 2012-06-19 13:41:15 +00:00
parent 18918a5e44
commit 6620c5c92d
1 changed files with 14 additions and 14 deletions
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28
modules/gpu/src/opencv2/gpu/device/warp_reduce.hpp
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@ -44,25 +44,25 @@
#ifndef OPENCV_GPU_WARP_REDUCE_HPP__
#define OPENCV_GPU_WARP_REDUCE_HPP__
namespace cv { namespace gpu { namespace device
{
template <class T>
namespace cv { namespace gpu { namespace device
{
template <class T>
__device__ __forceinline__ T warp_reduce(volatile T *ptr , const unsigned int tid = threadIdx.x)
{
const unsigned int lane = tid & 31; // index of thread in warp (0..31)
if (lane < 16)
{
T partial = ptr[tid];
ptr[tid] = partial = partial + ptr[tid + 16];
ptr[tid] = partial = partial + ptr[tid + 8];
ptr[tid] = partial = partial + ptr[tid + 4];
ptr[tid] = partial = partial + ptr[tid + 2];
ptr[tid] = partial = partial + ptr[tid + 1];
}
if (lane < 16)
{
T partial = ptr[tid];
return ptr[tid - lane];
ptr[tid] = partial = partial + ptr[tid + 16];
ptr[tid] = partial = partial + ptr[tid + 8];
ptr[tid] = partial = partial + ptr[tid + 4];
ptr[tid] = partial = partial + ptr[tid + 2];
ptr[tid] = partial = partial + ptr[tid + 1];
}
return ptr[tid - lane];
}
}}} // namespace cv { namespace gpu { namespace device {