Less talk

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I've been playing around a bit and have come up with the attached files,
the library isn't quite the same as those I've seen proposed before
mainly because

 1) Only one stream of digits is kept for each number, with negative
    exponents signifying some digits below the decimal point.  This
    simplifies the arithmetic greatly.

 2) I've implemented all the internal functions myself, more because
    I wanted to start with a collection that worked.  These should be
    replaced / reworked to use efficient methods (so long as they remain
    correct).

 3) I've written this with the goal of supporting IBM's Base Standard
    Arithmetic, although I expect that *in general* perl6 will not need
    these features, it will make writing a library that does trivial.
    Also, perl6 may well want to warn in places where the standard
    suggests an exception, such as loss of digits during rounding.

  4) With appropriate fiddling with precision (such as using negative
     values) the same API can support BigInts as well as BigFloats.

  5) I'd like very much to be able to back-port this into perl5 as it
     lacks a decimal arithmetic library, so have at present wrapped
     appropriate things in macros, and expect parrot to provide an
     additional .c file which will provide a less stringent string
     conversion, and string output which supports locales and what
     have you.

Notes on the source:

PINTD_ is used where a parrot interpreter might be a function parameter
PINT_  is used where a parrot interpreter might be a function argument

The source uses INTVALs and the like, these would be the appropriate
parrot typedefs, but when not in parrot, should be something sensible.

The various #defined limts I've got at the moment are merely for the
sake of having something.

It isn't entirely finished, BN_rescale and BN_power aren't done yet.

The exception handling isn't quite right, BN_EXCEPT will want to set
some sort of flags on the current context (when living as a C
library), although I'm not entirely sure how yet.  When being used in
parrot, I expect that the parrot exception mechanism will be followed.
Also, some operations might want to continue past errors, returning
say +Inf, which isn't included yet.

And, once more, I know I've started from scratch, but I did so as so
far little has been done, and what has been done should be easily
fitted into this framework.  Consider this more of a suggested API.

Alex Gough
-- 
We all do what we do, just to get by.
We all see what we see, not to ask why.
We will look the other way, when you walk by.
So don't ask us tomorrow, who did the crime?

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