[Bug middle-end/49563] New: Expansion forgets to set MEM_VOLATILE_P for TARGET_MEM_REF

["baldrick at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49563

           Summary: Expansion forgets to set MEM_VOLATILE_P for
                    TARGET_MEM_REF
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: baldrick@gcc.gnu.org


In expr.c, this code

        if (TREE_THIS_VOLATILE (exp))
          MEM_VOLATILE_P (temp) = 1;

sets MEM_VOLATILE_P for a volatile MEM_REF.  But this is not done for a
volatile
TARGET_MEM_REF.  This doesn't matter right now because tree-ssa-loop-ivopts.c
bails out if it sees a volatile memory reference, so volatile TARGET_MEM_REFs
don't (yet) occur in the wild.