Good link

Please look at the presentation again. The things you mentions are already put in the compiler. The initial design of the compiler made it very easy to add state-of-the-art optimizing stuff. I think especially the multi-class register allocator is one of the best available today.

Currently the code generated is between 0-10% slower than code generated by gcc, and most of the time "lost" is due to not-yet added optimizations. Still, the compiler runs around 15 times faster than gcc.