[Bug 1001539] Single precision floating point math library

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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001539

--- Comment #30 from Jonathan Larmour <jifl@ecoscentric.com> ---
(In reply to comment #29)
> 
> I'm referring to actual code Ref:float/ieee754_api/wf_asinf.c
> if (|x| > 1) POSIX mode sets errno = EDOM indeed, but returns 0 rather than
> NaN.

It's not required to return NaN. In fact the slightly older POSIX standard I've
got here (not online) says that more explicitly:

"If the value of x is not in the range [−1,1], and is not ±Inf or NaN, either
0.0 or NaN shall be returned and errno shall be set to [EDOM].

If x is NaN, NaN shall be returned and errno may be set to [EDOM].

If x is ±Inf, either 0.0 shall be returned and errno set to [EDOM], or NaN
shall be returned and errno may be set to [EDOM]."

I assume in the more recent standard they decided to make it more general - not
necessarily 0.0 but any value as long as it's implementation-defined. But that
can certainly be 0.0.

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