Since we can't get patches included upstream, I think we should include this one in Gentoo.
This bug crops up elsewhere, such as https://bugs.gentoo.org/show_bug.cgi?id=245701#c10
Please add to the glibc ebuilds.
Created attachment 200877 [details, diff]
patch to fix floor, ceil, rint on alpha
Please apply to 2.9_p20081201-r2 and 2.10.x.