Loop optimizer issues

[David Edelsohn]

>>>>> S Bosscher writes:

Steven> Well, surely some loop optimizers will still be necessary on RTL even with
Steven> tree-ssa, don't you think?

	Please read the full context of the thread:

"but surely the code motion I'm concerned with will at least partially be
done on tree-ssa (as loop invariant motion or pre or perhaps both)."

"... ust do these high-level motions on ast-level when they are not
represented in this ugly way (and either do only simpler pass on rtl, or
don't do it there at all, depending on what will turn to be more
practical)."

	Yes, RTL will have a simple loop optimizer, but not the
optimizations for which Zdenek wants to assume the absence of LIBCALLs.

David