[Bug c++/69564] [5/6 Regression] lto and/or C++ make scimark2 LU slower

[t.artem at mailcity dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69564

--- Comment #15 from Artem S. Tashkinov <t.artem at mailcity dot com> ---
Is this the same bug?

https://www.phoronix.com/scan.php?page=article&item=ubuntu-1604-compilers&num=2

In Dense LU Matrix Factorization GCC 5.3.1/6.0 is more than 2 times slower than
Clang.

G++ options: -O3 -march=native
CPU: Xeon E3-1280 v5