> > I see. So one possible canonicalization is to make _all_ > > pointer-typed FIELD_DECLs point to incomplete variants since the memory > > accesses should already have the "proper" access types. Can you > > get statistics on that? Not sure how to get an "incomplete" type > > though (iff we can simply copy the type and NULL TYPE_FIELDs and > > TYPE_SIZE and friends) - again I'd do that at FLD time. > > So sth like > > tp = build_distinct_type_copy (t); > TYPE_FIELDS (tp) = NULL_TREE; > TYPE_SIZE (tp) = NULL_TREE; > TYPE_SIZE_UNIT (tp) = NULL_TREE; > tp = type_hash_canon (tp); > > of course we "leak" the original type in used COMPONENT_REFs > (may also cause some verifier ICEs here if the types mismatch that > of the FIELD_DECLs) and in aggregate copies, etc. But I wonder > how much "unused" unnecessary types we have. That is, I'd paper > over the ICEs this causes and not fixup the IL stream at first for > example.
I had patch to play with this as well, let me see if I can revive it. One problem here is that we will lose info about ODR violations that happens through pointers. Honza
