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add prepascal atomicAdd double #12

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15 changes: 15 additions & 0 deletions cpp/cuda_common.cuh
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,21 @@ const int threads_per_block = 512;
#define tensor_acc_3(T, N, type) (T).packed_accessor64<type, N, torch::RestrictPtrTraits>()

/* Helpers */
#if !defined(__CUDA_ARCH__) || __CUDA_ARCH__ >= 600
#else
__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;
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


/** Error handling */
inline void _cuda_check_err(const cudaError_t err, const char* file, const int line, const char* function) {
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