error: function "atomicAdd(double *, double)" has already been defined错误解决方法

error: function "atomicAdd(double *, double)" has already been defined错误解决方法

cuda 8.0 提供了对atomicAdd的定义，但atomicAdd在之前的cuda toolkit中并未出现，因此一些程序自定义了atomicAdd函数。

因此，在atomicAdd前添加宏判断即可。

对文件修改成如下即可：

#ifndef CAFFE_COMMON_CUH_
#define CAFFE_COMMON_CUH_

#include 

  #if !defined(__CUDA_ARCH__) || __CUDA_ARCH__ >= 600

  #else
  static __inline__ __device__ double atomicAdd(double *address, double val) {
    unsigned long long int* address_as_ull = (unsigned long long int*)address;
    unsigned long long int old = *address_as_ull, assumed;
    if (val==0.0)
      return __longlong_as_double(old);
    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);
  }


  #endif
#endif