https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69564
--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to Artem S. Tashkinov from comment #15) > 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 Maybe. Though with -Ofast -march=native -funroll-loops is at least on my box GCC emitted code faster than clang, without -funroll-loops it is the opposite.
