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Rabbit 3000 64bit Integer math

+1 vote
Many, many years ago on the old Rabbit-Semi yahoo group there was a partial library someone had written that supported basic 64bit integer math. I think it was called BigNum or something along those lines.
Do any of you long-time Rabbit users remember and would you have access to it or a similar file?

Unfortunately, our move to a fancy new 32bit F4 processor has been delayed due to the chip shortage. As a result, I need to get a little more life out of our R3000 based product.
asked Aug 23, 2021 in Rabbit by skeller New to the Community (5 points)

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3 Answers

0 votes
I used jslong.c from the Mozilla Project as part of the XBee ANSI C Host Library, which was included in Dynamic C 10.


It's a fairly decent library for working with 64-bit numbers via a struct with high/low 32-bit values. You could take a look at the Rabbit platform code in that XBee Host Library configures macros referenced by the file to work within Dynamic C 10.

You might also be able to find the original Mozilla project to obtain unmodified copies of those files. I don't think the GitHub version of the XBee Host Library repository included the full commit history, so the original versions of jslong.{c,h} are likely absent.
answered Aug 30, 2021 by TomCollins Veteran of the Digi Community (2,229 points)
0 votes
I don't know about that library.

But if you use the Small Device C Compiler (SDCC), you can just use the types ISO C99 has for that: long long, unsigned long long and the types from stdint.h, i.e. as uint64_t, uint64_fast_t, uint64_least_t.
answered Sep 4, 2021 by spth New to the Community (24 points)
0 votes
Thanks for the suggestions.
I will look into jslong.c and see what I can do.

In my searches for an answer, I found SDCC, I had not heard of that before. However, this is an existing codebase written in DynamicC that is fairly large I don't really want to re-write everything to support a new compiler.
answered Sep 7, 2021 by skeller New to the Community (5 points)