primitive vector types

[Andrei Alexandrescu]

Don wrote:
> float[4] would be a greatly superior option if it could be done.
> The key requirements are:
> (1) need to specify that static arrays are passed by value.
> (2) need to keep stack aligned to 16.
> The good news is that both of these appear to be done on DMD2-Mac!

I agree with float[4] as a good choice. So are value semantics for T[n] 
implemented on the Mac??

Andrei