DIP80: phobos additions

[via Digitalmars-d]

Another thing worth noting is that I believe Intel has put some 
effort into next gen (?) LLVM/Clang for autovectorizing into 
AVX2. It might be worth looking into as it uses a mask that 
allows the CPU to skip computations that would lead to no change, 
but I think it is only available on last gen Intel CPUs.

Also worth keeping in mind is that future versions of LLVM will 
have to deal with GCC extensions and perhaps also Clang pragmas. 
So maybe take a look at:

http://clang.llvm.org/docs/LanguageExtensions.html#vectors-and-extended-vectors

and

http://clang.llvm.org/docs/LanguageExtensions.html#extensions-for-loop-hint-optimizations

?