[Bug ipa/92253] New: [10 Regression] 25% regression in 465.tonto with LTO

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92253

            Bug ID: 92253
           Summary: [10 Regression] 25% regression in 465.tonto with LTO
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

Between r277365 (good) and r277433 (bad) czerny observes a big regression for
465.tonto, but only with -flto (-Ofast -march=haswell otherwise).

Suspicious revs include the IPA reference refactoring in r277403.