> Hmmm. It'll be difficult to review such patch without access to a platform
> exhibiting such behavior ... IIRC IBM offers free access to open-source
> devs, I wonder if that would be a way.
I don't have access to such platform either, and I don't know too much
about this business. I left this patch out for now. It is something
that should affect all float operations not only the geometric types
anyway. Anybody who knows and cares about these platforms can pick
this up.
We can fix -0 issues in localized way, like you have done, if there
would be any more.