Why is this D code slower than C++?

[Lionello Lunesu]

When comparing the generated assembly from the dmc exe with the one from 
dmd, I noticed that the D one had many "movsd; movsd; movsd;" sequences 
(obviously copying of one vector3 to another). I could not find these in 
the C version.

Maybe the DMC is better at register aliasing (or what's it called) than 
DMD? I mean, DMD's actually moving data around, where DMC simply changes 
the names of the data?

Only W. knows.

L.