[Bug 277783] libc fma() doesn't not return the correct zero sign

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277783

--- Comment #17 from Steve Kargl <kargl@FreeBSD.org> ---
Perhaps, the comments needs an update, but I'm not sure to what.

I did look at
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libm/src/s_fma.c?annotate=1.7
which is based on das@ code.  This code does not have the special, but if I
read it correctly would fall through to the subnormal case in the lines 174-189
block of code with Victor's values.

netbsd uses essentially freebsd's code with a few minor changes, so likely has
the same issue as in this bug report.

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