Loop optimizer issues

[Richard Henderson]

On Wed, Jul 02, 2003 at 05:22:22PM -0400, David Edelsohn wrote:
> 	I'm sorry, I'm still confused.  If you are writing an RTL-based
> loop optimizer, you cannot avoid supporting LIBCALLs.  As long as you are
> working in the RTL space, you cannot make the simplification that Tree-SSA
> would allow.

Indeed.  At least for 3.4, when the tree-ssa optimizations aren't done.
It's not clear what loop optimizations should be done at the rtl level
when tree-ssa is present.


r~