[erwincoumans]

"as of 11.5, CUDA and nvcc support __int128_t in device code when the host compiler supports it (e.g., clang/gcc, but not MSVC). 11.6 added support for debug tools with __int128_t."

See:

https://developer.nvidia.com/blog/cuda-11-6-toolkit-new-rele... https://developer.nvidia.com/blog/implementing-high-precisio...