double-length integers/fixed

double-length integers/fixed

[Roger Barnett]

Does anyone know of a package supporting double-length integer
(and ideally fixed point) types ?

[ i.e. to provide support for a 2n-bit integer/fixed types using a compiler 
       which uses n-bits for its largest integer/fixed types ]

I'm looking at a couple of the arbitrary-size support packages, but 
I'd be interested to know if there are any more specific alternatives.


TIA

-- 
Roger Barnett

Re: double-length integers/fixed

[Gautier]

Roger Barnett wrote:

> Does anyone know of a package supporting double-length integer
> (and ideally fixed point) types ?
> 
> [ i.e. to provide support for a 2n-bit integer/fixed types using a compiler
>        which uses n-bits for its largest integer/fixed types ]
> 
> I'm looking at a couple of the arbitrary-size support packages, but
> I'd be interested to know if there are any more specific alternatives.

With a package providing arbitrary-size package you can define a fixed-size
subtype :-) E.g.

  NB_Blocs_maximal: constant:= 4;
  SUBTYPE ENTIER IS Multi_precision_integers.multi_int( NB_Blocs_maximal );

Some links for multi-precision @ http://members.xoom.com/gnatlist/

G.