[Bug middle-end/102997] [12 Regression] 45% 454.calculix regression with LTO+PGO -march=native -Ofast between ce4d1f632ff3f680550d3b186b60176022f41190 and 6fca1761a16c68740f875fc487b98b6bde8e9be7 on Zen

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102997

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
train data:

Samples: 6K of event 'cycles', Event count (approx.): 7715838425                
Overhead       Samples  Command          Shared Object                 Symbol   
   5.68%           382  calculix_peak.a  calculix_peak.amd64-m64-mine  [.]
insert.isra.0
   3.89%           262  calculix_peak.a  calculix_peak.amd64-m64-mine  [.]
isortii_
   2.36%           161  specperl         specperl                      [.]
Perl_hv_common
   1.94%           132  calculix_peak.a  calculix_peak.amd64-m64-mine  [.]
add_sm_st_
   1.69%           115  specperl         specperl                      [.]
S_regtry

ref data:

Samples: 601K of event 'cycles', Event count (approx.): 678304336437            
Overhead       Samples  Command          Shared Object                 Symbol   
  45.51%        274231  calculix_peak.a  calculix_peak.amd64-m64-mine  [.]
e_c3d_.constprop.0
  16.59%        100331  calculix_peak.a  calculix_peak.amd64-m64-mine  [.]
DVdot33
   7.91%         47070  calculix_peak.a  calculix_peak.amd64-m64-mine  [.]
GPart_smoothYSep
   3.54%         21391  calculix_peak.a  calculix_peak.amd64-m64-mine  [.]
Chv_updateS
   3.22%         19378  calculix_peak.a  calculix_peak.amd64-m64-mine  [.]
add_sm_st_
   2.71%         16238  calculix_peak.a  calculix_peak.amd64-m64-mine  [.]
SubMtx_sortColumnsUp
   2.43%         14549  calculix_peak.a  calculix_peak.amd64-m64-mine  [.]
IVqsortUp