[Bug libstdc++/29286] [4.0/4.1/4.2/4.3 Regression] placement new does not change the dynamic type as it should

[rguenth at gcc dot gnu dot org]

------- Comment #75 from rguenth at gcc dot gnu dot org  2007-05-16 17:08 -------
In the chance of endlessly repeating myself here (;)) - what comment #73 boils
down to is that we may not prune alias sets of stores based on TBAA results.
In fact, we need to realize that C++ object lifetime rules need to be modeled
somehow - it's those rules that count after all, not some magic side-effects
of placement new.

Of course I realize that without TBAA pruning we have no alias information left
on the RTL side for stores (so stores effectively have alias set zero).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29286