what I am looking for is a set of routines (e.g., a library),
written in portable pre-1999 C, whose source is available,
that, using 32-bit maths, implements at least the five basic
integer operations (+ - * / %) for 64-bit integers, and which
ideally has both a "signed" and "unsigned" version.
please note I said using 32-bit maths. so NO <long long>,
NO <__int64>, NO <i64>, none of that stuff! the compilers
(plural) in question do not have 64-bit integers.
ideally C, albeit C++ could be Ok, but NO assembly.
implementations in other languages (e.g., Java) which could
be used as a model and reference for a C version would be Ok.
ideally a BSD-ish license, albeit (L)GPL, CPL, or so on
should be Ok.
ideally, the "64-bit integers" would be stored as something
like an array or <struct> of two 32-bit integers. storing
as ASCII string, or BCD, or so on would be problematical.
I do not need an arbitrary precision package (such as GNUs
BigNum), nor rationals, nor fixed point, etc., just signed
and unsigned 64-bit integers. and please note I have _not_
mentioned (time) efficiency, albeit space (size) could be
a concern. but must be mathematically sound, and ideally
also has a comprehensive Test Suite.
Google™ has not (yet) been of much help here. (I suppose
the GCC support library might have something like this?)
any ideas? pointers?
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