dmd codegen improvements

[Paulo Pinto via Digitalmars-d]

On Wednesday, 19 August 2015 at 18:41:07 UTC, Walter Bright wrote:
> 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++.

C++ also has final and if I am not mistaken both LLVM and Visual 
C++ do devirtualization, not sure about other compilers.