For gCAS3 to provide nice cross-platform computing, a C library is needed for decimal formats. I have looked at BCD, IEEE floats, IEEE decimals, and I don't think there is much else.
Right now, I am looking at
IBM's Decimal32/64/128 library with extensions elsewhere for a IEEE decimal32/64/128 library with plenty of functions. However, I am looking for something written minimally but feature-rich. Any suggestions?
I'm actually very familiar with the libgmp library.
gmplib.org
Using it to calculate numbers in the millions of digits, there's an example in the archives. But WAIT
I'm releasing a solid v2.0 soon that adds and improves functionality.
Back to point: libgmp isn't just C, there are build for many languages.
How lightweight can I make gmp? It seemed it was very interdependent and pulling out one feature (binary 64bit floats) that it would be troublesome. I tried to find stripped-down versions and came back empty-handed.
Then again, I haven't looked at all of libgmp.
You should read up on all the build options and configurations.
Getting a library for just one function can be a waste, as you'll
likely find need of other functions later in the project.
Never thought I'd be using the libgmp's weird file IO, but bringing in
a number for primality check from a text file is a new feature.
Good luck. If nothing else, write your own struct to convert between
strings and unsigned long long
Also, libgmp is deprecated by mpfr.
The main goal is ripping something out and getting it running on the Z80. I will poke around GSL and MPFR (mpfr uses gmp?) shortly.
<edit>
I am using SoftFloat and fdlibm. Right now, I am lacking a stand-alone dtoa function and possibly a strtod one. The dtoa.c on netlib apparently is buggy and also has configs to the excess. Any suggestions?
Got Liotsch's 2010 Grisu3 algorithm working in C++, should be easy to convert to C, even easier to convert to using SoftFloat.
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