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.