From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 7DC51385354A; Tue,  6 Sep 2022 17:17:56 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7DC51385354A
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1662484676;
	bh=vsXubc16lBev4AprFfkiCLN5uEG2ZC2NwtSNT4XzIk4=;
	h=From:To:Subject:Date:From;
	b=dPq1QgUR1d7UKVinHk0MLw4VUOh9fgchlHA6qg0tq2FUQQyeovkhF2h8KcHB8PJdA
	 AUALWOaSu7YZ5JlXTGb1a6LQw1M922147L90mghtRGWzNhSyNTpUm75E4EIJEUF2ot
	 MzOpQz/lRtjcER/GV1ZkJYHrMEH6Ji8zlCv/zlDY=
From: "gscfq@t-online.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/106860] New: [12/13 Regression] ICE in single_pred_edge, at
 basic-block.h:347
Date: Tue, 06 Sep 2022 17:17:56 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: gscfq@t-online.de
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-106860-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106860

            Bug ID: 106860
           Summary: [12/13 Regression] ICE in single_pred_edge, at
                    basic-block.h:347
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Started with r12 between 20211219 and 20220109, at -O3 or -Ofast,
and with file gcc.dg/graphite/isl-ast-gen-user-1.c :
(gcc/g++ configured with --enable-checking=3Dyes)


$ cat isl-ast-gen-user-1.c
static const int N =3D 12;
int nSlip;

int main ()
{
  int i, j, k, fdot =3D 0;
  int a[N][N];

  for ( i =3D 1; i < nSlip; i++)
    {
      for ( j =3D i+1; j < nSlip; j++)
        {
          for ( k =3D 0; k < i; k++)
            fdot +=3D a[i][k] * a[k][j];
          a[i][j] =3D a[i][j] - fdot;
        }
   }

  return 0;
}


$ g++-13-20220904 -c isl-ast-gen-user-1.c -Ofast -ftrapv -fnon-call-excepti=
ons
-fno-tree-fre
during GIMPLE pass: lsplit
isl-ast-gen-user-1.c: In function 'int main()':
isl-ast-gen-user-1.c:4:5: internal compiler error: in single_pred_edge, at
basic-block.h:347
    4 | int main ()
      |     ^~~~
0x1390add single_pred_edge
        ../../gcc/basic-block.h:347
0x1390add split_loop
        ../../gcc/tree-ssa-loop-split.cc:647
0x1390add tree_ssa_split_loops
        ../../gcc/tree-ssa-loop-split.cc:1678=