Is there a good lib out there to handle large integer of know size ?

[Era Scarecrow via Digitalmars-d]

On Saturday, 10 June 2017 at 19:40:47 UTC, Andrei Alexandrescu 
wrote:
> That's cool as long as the assembler is guarded by 
> version(X_86) and has a portable alternative. Where's the code?

  Should i do a pull request and push it under std.experimental? 
Also if it's going to get renamed to a better struct name, gotta 
decide that. I think ScaledInt is a bad name to describe what it 
really is.

  The code's about 50k...

  I could instead push for an alternative version if you'd like, 
rebuild from the skeleton of this code to put the assembly 
versions of add/sub/mul/div to handle any size, and the template 
would only generate code for how big the struct is and passing 
buffers around... might be cleaner that way. Would also be easier 
for ctfe to handle calling for statically known values at compile 
time...