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Date: Tue, 09 Oct 2007 13:20:00 -0000
Subject: [Bug c/33711]  New: Missed optimization: reduction by subtraction (vectorizer)
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From: "eres at il dot ibm dot com" <gcc-bugzilla@gcc.gnu.org>
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For example:

   for (i = 0; i < N; i++) {
     udiff -= (ub[i] * uc[i]);


-- 
           Summary: Missed optimization: reduction by subtraction
                    (vectorizer)
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: eres at il dot ibm dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33711