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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/103432] [12 regression] libjxl-0.5 is miscompiled, works
 fine with -fno-ipa-modref
Date: Fri, 26 Nov 2021 00:33:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103432

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |needs-reduction, wrong-code
   Last reconfirmed|2021-11-26 00:00:00         |
   Target Milestone|---                         |12.0
             Status|ASSIGNED                    |NEW
           Assignee|hubicka at gcc dot gnu.org         |unassigned at gcc d=
ot gnu.org
      Known to work|                            |11.2.0
          Component|tree-optimization           |ipa

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, I have not reduced it but here is what is happening.
  outD.25694 =3D {};
...
  MEM[(struct DCTToD.21174 *)&D.25700 clique 3 base 1].data_D.21196 =3D
&outD.25694;

...
=20
_ZN12_GLOBAL__N_121GenericTransposeBlockILm1ELm4ENS_7DCTFromENS_5DCTToEEEvR=
KT1_RKT2_.constprop.0D.25466
(&D.25767, &D.25766);
...
=20
_ZN12_GLOBAL__N_113IDCT1DWrapperILm4ELm1ENS_7DCTFromENS_5DCTToEEEvRKT1_RKT2=
_.constprop.0D.25467
(&D.25768, &D.25700);

...
  _3 =3D outD.25694[2];

FRE thinks
_ZN12_GLOBAL__N_113IDCT1DWrapperILm4ELm1ENS_7DCTFromENS_5DCTToEEEvRKT1_RKT2=
_.constprop.0
does not touch out even though D.25700 is passed to it ....=