dmd codegen improvements

[Walter Bright via Digitalmars-d]

On 8/19/2015 11:03 AM, Jacob Carlborg wrote:
> Not sure how the compilers behave in this case but what about devirtualization?
> Since I think most developers compile their D programs with all files at once
> there should be pretty good opportunities to do devirtualization.

It's true that if generating an exe, the compiler can mark leaf classes as final 
and get devirtualization. (Of course, you can manually add 'final' to classes.)

It's one way D can generate faster code than C++.