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ndt_reduce.cu
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ndt_reduce.cu
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/*************************************************************************
LIBRARY: NDT-NEW DEVELOPER TOOLS
FILE: ndt_reduce.cu
AUTHOR: Zehuan Wang
DATA: 12/20/2012
Reduction tools
**************************************************************************
**************************************************************************
ROUTINES:
ndt_block_reduce_min
*************************************************************************/
#include "ndt.h"
#ifndef MIN
#define MIN(x,y) ((x)>(y)?(y):(x))
#endif
template<typename T>
__device__ T ndt_block_reduce_min(T *ndt_i_pt_array, const int ndt_i_i_length)
{
int t = threadIdx.x;
bool odd = false;
extern __shared__ T array[];
if(t < ndt_i_i_length)
{
array[t] = ndt_i_pt_array[t];
}
__syncthreads();
int i = ndt_i_i_length;
while(i > 1)
{
if((i>>1)*2 < i)
{
i = i>>1;
i++;
odd = true;
}
else
{
i = i>>1;
odd = false;
}
if((t < i && odd == false) || t < i-1)
array[t] = MIN(array[t+i],array[t]);
__syncthreads();
}
return array[0];
}