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[Bug rtl-optimization/25654] [4.0/4.1/4.2 Regression] RTL alias analysis unprepared to handle stack slot sharing
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 19 Jan 2006 00:19:18 -0000
- Subject: [Bug rtl-optimization/25654] [4.0/4.1/4.2 Regression] RTL alias analysis unprepared to handle stack slot sharing
- References: <bug-25654-280@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #11 from pinskia at gcc dot gnu dot org 2006-01-19 00:19 -------
(In reply to comment #10)
> My understanding of C type based aliasing rules always was that char, as an
> exception, might alias with everything. Perhaps I lived in false belief for a
> while, but at least -Wstrict-aliasing seems to think so:
The aliasing rules are asymmetrical.
See http://gcc.gnu.org/ml/gcc-patches/2005-11/msg00980.html
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25654