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Re: long pending patch for tree-profiling-branch
- From: Ira Rosen <IRAR at il dot ibm dot com>
- To: Olga Golovanevsky <OLGA at il dot ibm dot com>
- Cc: Daniel Berlin <dberlin at us dot ibm dot com>, Daniel Berlin <dberlin at dberlin dot org>, dnovillo at redhat dot com, gcc-patches at gcc dot gnu dot org, jh at suse dot cz, Steven Bosscher <stevenb at novell dot com>
- Date: Tue, 26 Jul 2005 11:09:27 +0300
- Subject: Re: long pending patch for tree-profiling-branch
Olga Golovanevsky/Haifa/IBM wrote on 25/07/2005 14:37:57:
> By the way, for now the vectorizer does not use may_alias_p
> (the latest code in autovect branch). It actually use type_mem_tag and
> is_aliased_with function in which may_aliases field is used.
> Do you think it will stay so, and ipaa info will be
> incorporated in may_aliases/type_mem_tag, or alternatively, it will
> be oracle like may_alias_p that will be called directly by vectorizer?
The reason we don't use may_alias_p is that it doesn't supply the
information we need. Given a pointer and an object, we have to decide
whether the pointer can point to the object. In order to do this we check
may_aliases of the pointer's tag in the function is_aliased_with (suggested
by Diego in http://gcc.gnu.org/ml/gcc-patches/2005-05/msg02391.html).
BTW, this code is no longer in the vectorizer. It was moved to
tree-data-ref.c and is now a part of general data-refs analysis (both in
the autovect branch and mainline).
Ira