https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68654

            Bug ID: 68654
           Summary: [6 Regression] CoreMark Pro performance degradation
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: afomin.mailbox at gmail dot com
                CC: izamyatin at gmail dot com, law at redhat dot com
  Target Milestone: ---
            Target: i686-*-*

After r228668 we can see a performance degradation in CoreMark Pro benchmark
compiled with -m32 -Ofast -funroll-loops for Haswell CPU.

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