optimize vector code

[Saaa]

> > So, it is a lot faster indeed, but yet not as fast as inling the 
> > functions manually. :(
> 
> It's been mentioned before that DMD is particularly poor at floating 
> point optimizations.  If it matters a lot to you, you might be able to 
> get better results from GDC, which uses gcc's backend.  If you do try it 
> I'd love to hear the benchmark results.
> 
> --bb

If the inlining was done correctly how could floating-point-optimizations account for the difference in speed? Or am I missing something? (probably:)