[RFC]: add `math/base/special/asinhf`

[gunjjoshi]

Description

This RFC proposes adding math/base/special/asinhf, which would be the single-precision equivalent for math/base/special/asinh.

float stdlib_base_asinhf( const float x )

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Checklist

• [X] I have read and understood the Code of Conduct.
• [X] Searched for existing issues and pull requests.
• [X] The issue name begins with RFC:.

[gunjjoshi]

I would like to work on this.

[gunjjoshi]

This requires log1pf, which must be implemented first. Our log1p is based on https://www.netlib.org/fdlibm/s_log1p.c, but I couldn't find the single-precision implementation for it. Is it there ? If not, what source must we then follow for log1pf ?

[gunjjoshi]

FreeBSD has log1pf implementation : https://svnweb.freebsd.org/base/release/12.2.0/lib/msun/src/s_log1pf.c?revision=367086&view=markup

[kgryte]

Use FreeBSD v12.2.0. Our log1p probably needs to be updated, as I imagine that the fdlibm implementation is somewhat out-of-date.

[gunjjoshi]

log1pf, in turn, requires roundf. It isn't needed for the function's implementation, but is required at examples/index.js. Should I go ahead for roundf ?

[kgryte]

@gunjjoshi Yes, feel free to go ahead and create roundf. Now that round has a C implementation, this should hopefully be more straightforward.

[gunjjoshi]

Great, @kgryte, I'll move ahead with roundf!