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  //                          License Agreement
  //                For Open Source Computer Vision Library
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  //     derived from this software without specific prior written permission.
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  //M*/
  
  #pragma once
  
  #ifndef __OPENCV_CUDEV_UTIL_ATOMIC_HPP__
  #define __OPENCV_CUDEV_UTIL_ATOMIC_HPP__
  
  #include "../common.hpp"
  
  namespace cv { namespace cudev {
  
  // atomicAdd
  
  __device__ __forceinline__ int atomicAdd(int* address, int val)
  {
      return ::atomicAdd(address, val);
  }
  
  __device__ __forceinline__ uint atomicAdd(uint* address, uint val)
  {
      return ::atomicAdd(address, val);
  }
  
  __device__ __forceinline__ float atomicAdd(float* address, float val)
  {
  #if CV_CUDEV_ARCH >= 200
      return ::atomicAdd(address, val);
  #else
      int* address_as_i = (int*) address;
      int old = *address_as_i, assumed;
      do {
          assumed = old;
          old = ::atomicCAS(address_as_i, assumed,
              __float_as_int(val + __int_as_float(assumed)));
      } while (assumed != old);
      return __int_as_float(old);
  #endif
  }
  
  __device__ static double atomicAdd(double* address, double val)
  {
  #if CV_CUDEV_ARCH >= 130
      unsigned long long int* address_as_ull = (unsigned long long int*) address;
      unsigned long long int old = *address_as_ull, assumed;
      do {
          assumed = old;
          old = ::atomicCAS(address_as_ull, assumed,
              __double_as_longlong(val + __longlong_as_double(assumed)));
      } while (assumed != old);
      return __longlong_as_double(old);
  #else
      (void) address;
      (void) val;
      return 0.0;
  #endif
  }
  
  // atomicMin
  
  __device__ __forceinline__ int atomicMin(int* address, int val)
  {
      return ::atomicMin(address, val);
  }
  
  __device__ __forceinline__ uint atomicMin(uint* address, uint val)
  {
      return ::atomicMin(address, val);
  }
  
  __device__ static float atomicMin(float* address, float val)
  {
  #if CV_CUDEV_ARCH >= 120
      int* address_as_i = (int*) address;
      int old = *address_as_i, assumed;
      do {
          assumed = old;
          old = ::atomicCAS(address_as_i, assumed,
              __float_as_int(::fminf(val, __int_as_float(assumed))));
      } while (assumed != old);
      return __int_as_float(old);
  #else
      (void) address;
      (void) val;
      return 0.0f;
  #endif
  }
  
  __device__ static double atomicMin(double* address, double val)
  {
  #if CV_CUDEV_ARCH >= 130
      unsigned long long int* address_as_ull = (unsigned long long int*) address;
      unsigned long long int old = *address_as_ull, assumed;
      do {
          assumed = old;
          old = ::atomicCAS(address_as_ull, assumed,
              __double_as_longlong(::fmin(val, __longlong_as_double(assumed))));
      } while (assumed != old);
      return __longlong_as_double(old);
  #else
      (void) address;
      (void) val;
      return 0.0;
  #endif
  }
  
  // atomicMax
  
  __device__ __forceinline__ int atomicMax(int* address, int val)
  {
      return ::atomicMax(address, val);
  }
  
  __device__ __forceinline__ uint atomicMax(uint* address, uint val)
  {
      return ::atomicMax(address, val);
  }
  
  __device__ static float atomicMax(float* address, float val)
  {
  #if CV_CUDEV_ARCH >= 120
      int* address_as_i = (int*) address;
      int old = *address_as_i, assumed;
      do {
          assumed = old;
          old = ::atomicCAS(address_as_i, assumed,
              __float_as_int(::fmaxf(val, __int_as_float(assumed))));
      } while (assumed != old);
      return __int_as_float(old);
  #else
      (void) address;
      (void) val;
      return 0.0f;
  #endif
  }
  
  __device__ static double atomicMax(double* address, double val)
  {
  #if CV_CUDEV_ARCH >= 130
      unsigned long long int* address_as_ull = (unsigned long long int*) address;
      unsigned long long int old = *address_as_ull, assumed;
      do {
          assumed = old;
          old = ::atomicCAS(address_as_ull, assumed,
              __double_as_longlong(::fmax(val, __longlong_as_double(assumed))));
      } while (assumed != old);
      return __longlong_as_double(old);
  #else
      (void) address;
      (void) val;
      return 0.0;
  #endif
  }
  
  }}
  
  #endif
  