details in theis thread:
http://gcc.gnu.org/ml/gcc/2006-09/msg00503.html

Need to add other ways to handle realignment, that are applicable to targets
that can't support the realign_load the way it is currently defined.


-- 
           Summary: missed optimization: need to generalize realignment
                    support in the vectorizer
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dorit at il dot ibm dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29268

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