Loop optimizer issues

[David Edelsohn]

>>>>> Jan Hubicka writes:

Jan> Zdenek is speaking about the invariant motion.  Clearly there are many
Jan> cases where RTL expansion will bring oppurtunities for invariant motion,
Jan> so these needs to be re-done on the RTL.

Jan> Concerning libcalls, they should not exist in post-tree-SSA world as
Jan> they are just papering over the problem that such complex things should
Jan> have been moved earlier.

	How about starting with a Tree-SSA loop optimization
infrastructure and then back-filling RTL loop optimizations where they are
profitable instead of guessing?

David