[Bug tree-optimization/87402] New: [9 Regression] ICE in set_ssa_val_to, at tree-ssa-sccvn.c:3645

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87402

            Bug ID: 87402
           Summary: [9 Regression] ICE in set_ssa_val_to, at
                    tree-ssa-sccvn.c:3645
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---

gcc-9.0.0-alpha20180923 snapshot (r264518) ICEs when compiling the following
snippet w/ -O1 or -Og:

void
xl (int co)
{
  int ar = 0;

  if (ar != 0)
    {
      int pp, ll = 0;
      int *zx;

      if (co == 0)
        {
        }
      else
        {
          zx = &pp;

          if (co < 0)
            while (co < 1)
              {
 to:
                while (ll < 1)
                  ++ll;
              }

          *zx = &ar;
        }
    }

  goto to;
}

% gcc-9.0.0-alpha20180923 -O1 -w -c ycq12qdw.c
during GIMPLE pass: fre
ycq12qdw.c: In function 'xl':
ycq12qdw.c:31:1: internal compiler error: in set_ssa_val_to, at
tree-ssa-sccvn.c:3645
31 | }
   | ^
0x6a56d1 set_ssa_val_to
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/tree-ssa-sccvn.c:3645
0xe731f8 visit_phi
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/tree-ssa-sccvn.c:4254
0xe7378f visit_stmt
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/tree-ssa-sccvn.c:4297
0xe74d78 process_bb
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/tree-ssa-sccvn.c:5919
0xe7660f do_rpo_vn
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/tree-ssa-sccvn.c:6622
0xe7776c execute
       
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/tree-ssa-sccvn.c:6756