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  #ifndef __OPENCV_GPU_DEVICE_WARP_HPP__
  #define __OPENCV_GPU_DEVICE_WARP_HPP__
  
  namespace cv { namespace gpu { namespace device
  {
      struct Warp
      {
          enum
          {
              LOG_WARP_SIZE = 5,
              WARP_SIZE     = 1 << LOG_WARP_SIZE,
              STRIDE        = WARP_SIZE
          };
  
          /** \brief Returns the warp lane ID of the calling thread. */
          static __device__ __forceinline__ unsigned int laneId()
          {
              unsigned int ret;
              asm("mov.u32 %0, %laneid;" : "=r"(ret) );
              return ret;
          }
  
          template<typename It, typename T>
          static __device__ __forceinline__ void fill(It beg, It end, const T& value)
          {
              for(It t = beg + laneId(); t < end; t += STRIDE)
                  *t = value;
          }
  
          template<typename InIt, typename OutIt>
          static __device__ __forceinline__ OutIt copy(InIt beg, InIt end, OutIt out)
          {
              for(InIt t = beg + laneId(); t < end; t += STRIDE, out += STRIDE)
                  *out = *t;
              return out;
          }
  
          template<typename InIt, typename OutIt, class UnOp>
          static __device__ __forceinline__ OutIt transform(InIt beg, InIt end, OutIt out, UnOp op)
          {
              for(InIt t = beg + laneId(); t < end; t += STRIDE, out += STRIDE)
                  *out = op(*t);
              return out;
          }
  
          template<typename InIt1, typename InIt2, typename OutIt, class BinOp>
          static __device__ __forceinline__ OutIt transform(InIt1 beg1, InIt1 end1, InIt2 beg2, OutIt out, BinOp op)
          {
              unsigned int lane = laneId();
  
              InIt1 t1 = beg1 + lane;
              InIt2 t2 = beg2 + lane;
              for(; t1 < end1; t1 += STRIDE, t2 += STRIDE, out += STRIDE)
                  *out = op(*t1, *t2);
              return out;
          }
  
          template<typename OutIt, typename T>
          static __device__ __forceinline__ void yota(OutIt beg, OutIt end, T value)
          {
              unsigned int lane = laneId();
              value += lane;
  
              for(OutIt t = beg + lane; t < end; t += STRIDE, value += STRIDE)
                  *t = value;
          }
      };
  }}} // namespace cv { namespace gpu { namespace device
  
  #endif /* __OPENCV_GPU_DEVICE_WARP_HPP__ */