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Re: PATCH RFA: PR 29286: Handle placement new aliasing issues

On 6/9/07, Eric Botcazou <ebotcazou@adacore.com> wrote: 
> Because it's a huge hammer, and would disable all alias analysis for
> that type, instead of just for the result of placement new.

Still the same urban legend. :-)  TYPE_REF_CAN_ALIAS_ALL is a property of
pointer types, so it would seem to be a natural fit for pointers which are
returned from placement new.


except those casts can be removed and really is not good for
preformance.  Please read all the 175 comments in the bug report
before going on about using a feature.  We already tried
TYPE_REF_CAN_ALIAS_ALL and really TYPE_REF_CAN_ALIAS_ALL is broken in
a different way as you say it is a property of the pointer type but I
(and others) say typed based aliasing is a property of the element
type that is being accessed.

-- Pinski

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