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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/103246] [12 Regression] 416.gamess miscompare with -O2 -g
 -flto=auto since r12-5223-gecdf414bd89e6ba251f6b3f494407139b4dbae0e
Date: Tue, 16 Nov 2021 22:42:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103246

--- Comment #11 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Thanks for reducing the testcase.
I found the reason for build difference.  There is misplaced code clearing
to_info_lto.=20

hubicka@lomikamen-jh:/aux/hubicka/trunk-git/build4/gcc$ cat ~/fix
diff --git a/gcc/ipa-modref.c b/gcc/ipa-modref.c
index a70575bc807..1241e567266 100644
--- a/gcc/ipa-modref.c
+++ b/gcc/ipa-modref.c
@@ -5123,6 +5150,7 @@ ipa_merge_modref_summary_after_inlining (cgraph_edge
*edge)
            fprintf (dump_file, "Removed mod-ref summary for %s\n",
                     to->dump_name ());
          summaries_lto->remove (to);
+         to_info_lto =3D NULL;
        }
       else if (to_info_lto && dump_file)
        {
@@ -5130,7 +5158,6 @@ ipa_merge_modref_summary_after_inlining (cgraph_edge
*edge)
            fprintf (dump_file, "Updated mod-ref summary for %s\n",
                     to->dump_name ());
          to_info_lto->dump (dump_file);
-         to_info_lto =3D NULL;
        }
       if (callee_info_lto)
        summaries_lto->remove (edge->callee);=