[Bug math/887] Math library function "logb" and "nextafter" inconsistent

["jakub at redhat dot com" <sourceware-bugzilla@sourceware.org>]

------- Additional Comments From jakub at redhat dot com  2005-11-21 18:07 -------
The patch is definitely wrong.
First of all, you haven't proven in any way with standard references that
the current behaviour is incorrect.
If that is a bug (I'm not aware of any part of the standard that would mandate
that), then it would be a generic GCC problem on ppc32 with casts from int
to double with FE_DOWNWARD rounding.  As on ppc32 we can't assume a hw
instruction for that, GCC on ppc32 computes the cast as
((double) (4503601774854144 + i)) - 4503601774854144.0
for int i.  With FE_DOWNWARD rounding and i == 0, this results in -0.0.
Working around this for two randomly picked functions when the same thing
occurs in hundreds of other functions is certainly not the way to go.


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http://sourceware.org/bugzilla/show_bug.cgi?id=887

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