Slow performance compared to C++, ideas?

[David Nadlinger]

On Friday, 31 May 2013 at 06:41:19 UTC, Manu wrote:
> It would be nice
> if array operations would unroll for short arrays. Particularly 
> so for
> static arrays!

It definitely is something we need to implement. There is just no 
excuse not to, and it hampers the practicality of a nice language 
feature. I didn't profile the original program yet, but I bet 
it's one of the major reasons why the LDC version is so slow.

I wonder where the best place to do this would be though. Doing 
it in the frontend would allow all three compilers to take 
advantage of the transformation, but it's really glue code stuff.

IIRC, GDC already does something like that?

David