block reordering at GIMPLE level?

[Erven ROHOU]

Hello,
While working on our CLI port, I realized that we were missing, among 
others, the block reordering pass. This is because we emit CLI code 
before the RTL passes are reached.
Looking at the backend optimizations, it is clear that some modify the 
CFG. But my understanding is that loop optimizations and unrolling are 
also being moved to GIMPLE. I do not know about others.

Could it be that sometime all the optimizations that modify the CFG are 
run on GIMPLE?
Is there any plan/interest in having a block layout pass running at 
GIMPLE level?

Cheers,

--
Erven.