[Bug tree-optimization/102128] New: [12 Regression] Huge performance drop for 519.lbm_r since r12-3116-g9216ee6d1195d48388f825cf1b072e570129cbbe

[marxin at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102128

            Bug ID: 102128
           Summary: [12 Regression] Huge performance drop for 519.lbm_r
                    since
                    r12-3116-g9216ee6d1195d48388f825cf1b072e570129cbbe
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: rguenth at gcc dot gnu.org
            Blocks: 26163
  Target Milestone: ---

Since the revision, the benchmark is slower with -Ofast PGO (and LTO) on AMD
and Intel machines:

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=14.477.0&plot.1=16.477.0&;

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=286.477.0&plot.1=16.477.0


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)