/warp_reduce_shfl.cuh/1.1/Thu Sep  8 21:02:05 2016//THEAD
/warp_reduce_smem.cuh/1.1/Thu Sep  8 21:02:05 2016//THEAD
/warp_scan_shfl.cuh/1.1/Thu Sep  8 21:02:05 2016//THEAD
/warp_scan_smem.cuh/1.1/Thu Sep  8 21:02:06 2016//THEAD
D
