[Bug c++/78402] New: SciMark v2.0 Dense LU Matrix Factorization test runs more than 2 times slower under GCC 6.2 than under Clang 3.9

[t.artem at mailcity dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78402

            Bug ID: 78402
           Summary: SciMark v2.0  Dense LU Matrix Factorization test runs
                    more than 2 times slower under GCC 6.2 than under
                    Clang 3.9
           Product: gcc
           Version: 6.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: t.artem at mailcity dot com
  Target Milestone: ---

As per
http://www.phoronix.com/scan.php?page=article&item=gcc-clang-kblclear&num=2

GCC 6.2.0 - 1834
Clang 3.9.0 - 4165

g++ options: -O3 -march=native

CPU: Kaby Lake 7200U (the same CPU core as Sandy Bridge)