How to use long arithmetic in a CUDA

Question

Hi everyone.
I want to use more than 512 bits digits in a my CUDA code.
But i did not find any information abot how to use big integer in CUDA.
If anybody know how to make it,please write me.

Answer 1

https://devtalk.nvidia.com/default/topic/610914/cuda-programming-and-performance/modular-exponentiation-amp-biginteger/

Answer 2

Thx. But how get sqrt?
I wanna use big digit like a few float.
I need next function: add,sub,mul and sqrt.
But now i don't understand how i can divide one big to few float.....