[rfc] rint() rounds to even

[Ulrich Drepper]

Ben Collins <bcollins@debian.org> writes:

> Now my math may be a little rusty and old, but I always assumed that
> "n.5" always rounded to "n+1".

This is highschool math.  You don't care there about optimizations for
limited precision systems.  The round to even rule is produce results
which are arithmetically more stable.  The implementation is correct.

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