[Bug rtl-optimization/96337] New: GCC 10.2: twice as slow for -O2 -march=x86-64 vs. GCC 9.3/8.4

[aros at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96337

            Bug ID: 96337
           Summary: GCC 10.2: twice as slow for -O2 -march=x86-64 vs. GCC
                    9.3/8.4
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: aros at gmx dot com
  Target Milestone: ---

All the pertinent details are on this page:

https://www.phoronix.com/scan.php?page=article&item=gcc-10900k-compiler&num=4

Options used: -O2

CPU used: Intel Core i9 10900K

I wonder what could have caused such a huge regression. Many Linux distros
compile their code just for -march=x86-64 and could be affected by the bug.