D-Programming-Language/phobos — pull request #1391 by TurkeyMan (2013-07-05 14:13:40+00:00)
Title: Added support for simd primitives to std.traits.Signed/Unsigned

I think the SIMD primitives should receive the same treatment as regular primitives in this case.
I also fixed a bug in Unsigned!float.

Didn't add a unittest, since it's not guaranteed these types will be available on the target hardware.