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

[deadalnix via Digitalmars-d]

On Sunday, 11 June 2017 at 18:01:41 UTC, Era Scarecrow wrote:
> On Sunday, 11 June 2017 at 08:52:37 UTC, deadalnix wrote:
>> I ended up doing my own. There are just no way to do it well 
>> without cent/ucent . Weka is running into the same problem for 
>> error correction.
>
>  And what timing, I just finished getting it working with 
> assembly and compatible versions. Seems 5x slower rather than 
> the dreaded 50, but that's from testing factorial up to 100 
> (200ms vs 1,200ms).
>
>  Anyways, here's how it is currently, most features are 
> avaliable, need more tests and find occurrences where it 
> doesn't work.
>
>  
> https://github.com/rtcvb32/Side-Projects/blob/master/scaledint.d
>
>  One note, to get the x86 assembly versions, use 
> -version=Intel, I have it disabled so I can concentrate on the 
> compatible version and switch between them on my machine. 
> -debug includes a unittest that runs a factorial test

You misunderstood. We need cent/ucent supported by the compiler 
to get to larger integral types efficiently. There are no ways 
around it. There are a ton of operations such as the X86 MUL 
which are able to produce a large multiplication into 2 
registers. There are no way to leverage theses without compiler 
provided cent/ucent.