https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88494
Bug ID: 88494 Summary: [9 Regression] polyhedron 10% mdbx runtime regression Product: gcc Version: 9.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: rguenth at gcc dot gnu.org Target Milestone: --- Between r266526 (good) and r266587 (bad) polyhedron mdbx runtime regressed from 6s to 6.7s on a Haswell machine with -Ofast -march=native -funroll-loops. https://gcc.opensuse.org/gcc-old/c++bench-czerny/pb11/pb11-summary.txt-2-0.html There are not many interesting changes in the revision range but I sofar didn't reproduce elsewhere nor bisected the above revs.