Mark Dickinson <dicki...@gmail.com> added the comment:

> If tests continue to fail on some platforms, I plan to manually handle NaN 
> and INF in the C code, before calling libc fma().

For Windows, you need to do much more than this: it's not just about handling 
NaNs and infinities, it's about reimplementing the entire function from scratch 
to give correctly rounded results. Without correctly-rounded results, there's 
very little point in having fma.

If it were a couple of niche platforms that gave bad results, then we could 
push this through. But it's Windows. :-(

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<https://bugs.python.org/issue29282>
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