masked loads?

[Kay F. Jahnke]

Am 19.07.2016 um 10:10 schrieb Matthias Kretz:

> Vector<T> x = {};
> x(mask) = Vector<T>(mem);
>
> i.e. initialize a null vector object. Then do a masked assignment from an
> unmasked load. This is not as efficient as _mm_maskload_ps (unless the
> compiler does the optimization).

If mem points to ordinary memory which contains less than 
Vector<T>::Size T, is it guaranteed to be safe to construct a Vector<T> 
from mem? I would have assumed that the construction would access 
Vector<T>::Size T and therefore might access memory it's not supposed to 
see, and so produce a memory fault.

   float mem[3] ;
   ...
   Vc::Vector<float> x (mem) ; // is this safe?

I want the masked load to load from ordinary memory, not Vc::Memory, 
which is padded and where the unmasked load will certainly work.

With regards
Kay