warp_reduce.hpp
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* Author: Anatoly Baskeheev, Itseez Ltd, (myname.mysurname@mycompany.com)
*/
#ifndef PCL_GPU_WARP_REDUCE
#define PCL_GPU_WARP_REDUCE
namespace pcl
{
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];
}
return ptr[tid - lane];
}
}
}
#endif
pcl
Definition: convolution.h:45
pcl::device::warp_reduce
__device__ __forceinline__ T warp_reduce(volatile T *ptr, const unsigned int tid=threadIdx.x)
Definition: warp_reduce.hpp:46