Reduction and induction that involve multiplication, 
i.e., 
  for i
    prod *= CST 

or 
  for i
    prod *= a[i] 

are currently not supported by the vectorizer.


-- 
           Summary: Reduction and induction with multiplication are not
                    vectorized
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: irar at il dot ibm dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35226

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