------- Comment #28 from amacleod at redhat dot com 2007-06-19 18:57 ------- Won't solve the problem currently, but I think the long term solution is to do stack analysis when out-of-ssa and expand have been merged into a single entity. The live range info out-of-ssa calculates can be used to do a decent job of stack sharing regardless of scoping info.
Short term, we might be able to check to see if a stack variable is used outside its scope when going out of ssa, and flag it for no sharing, or promote it to file level, or the next appropriate scope level. That would work as long as we don't end up promoting too many things in the wrong routines :-). I'm not fond of trying to make the optimization passes aware of scopes on top of everything else they are aware of, Id rather see it taken care of in one place, and not dependent on scoping info. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32327
