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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/46217] [4.6 Regression] store to volatile is removed
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46217

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2010.10.29 12:58:31
         AssignedTo|unassigned at gcc dot       |rguenth at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1
           Severity|blocker                     |normal

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-29 12:58:31 UTC ---
I will have a look.  But I think that automatic volatiles are odd anyway ;)

The problem is that DCE doesn't mark the statement as always needed.