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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/97292] [11 Regression] dealII from SPECCPU 2016 no longer
 terminates after g:c34db4b6f8a5d80367c709309f9b00cb32630054
Date: Tue, 06 Oct 2020 08:27:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97292

--- Comment #2 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
Created attachment 49314
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D49314&action=3Dedit
Debug counter patch

First bad debug counter value is -fdbg-cnt=3Dipa_mod_ref:2793.
Difference is for: TriaObjectAccessor<3, 3>::operator++():

  LTO stores:
    Limits: 32 bases, 16 refs
      Base 0:struct TriaObjectAccessor (alias set 172)
        Ref 0:int (alias set 6)
          access: Parm 0
          access: Parm 0 param offset:0 offset:0 size:32 max_size:32

  LTO stores:
    Limits: 32 bases, 16 refs
      Base 0:struct TriaObjectAccessor (alias set 172)
        Ref 0:int (alias set 6)
          access: Parm 0 param offset:0 offset:32 size:32 max_size:32
          access: Parm 0 param offset:0 offset:0 size:32 max_size:32

template <int dim>
inline
void
TriaObjectAccessor<3,dim>::operator ++ ()
{
  ++this->present_index;
                                   // is index still in the range of
                                   // the vector?
  while (this->present_index
         >=3D
=20=20=20=20=20=20=20=20
static_cast<int>(this->tria->levels[this->present_level]->hexes.hexes.size(=
)))
    {
                                       // no -> go one level up
      ++this->present_level;
      this->present_index =3D 0;
                                       // highest level reached?
      if (this->present_level >=3D static_cast<int>(this->tria->levels.size=
()))
        {
                                           // return with past the end poin=
ter
          this->present_level =3D this->present_index =3D -1;
          return;
        };
    };
}

hope it helps.=