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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/108685] [10/11/12/13 Regression] ICE in
 verify_loop_structure, at cfgloop.cc:1748 since r13-2388-ga651e6d59188da
Date: Wed, 15 Feb 2023 16:14:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108685

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Though, we have such code already:
      if (broken_loop)
        {
          int i;
          for (i =3D fd->collapse; i < fd->ordered; i++)
            {
              tree type =3D TREE_TYPE (fd->loops[i].v);
              tree this_cond
                =3D fold_build2 (fd->loops[i].cond_code, boolean_type_node,
                               fold_convert (type, fd->loops[i].n1),
                               fold_convert (type, fd->loops[i].n2));
              if (!integer_onep (this_cond))
                break;
            }
          if (i < fd->ordered)
            {
              cont_bb
                =3D create_empty_bb (EXIT_BLOCK_PTR_FOR_FN (cfun)->prev_bb);
              add_bb_to_loop (cont_bb, l1_bb->loop_father);
              gimple_stmt_iterator gsi =3D gsi_after_labels (cont_bb);
              gimple *g =3D gimple_build_omp_continue (fd->loop.v, fd->loop=
.v);
              gsi_insert_before (&gsi, g, GSI_SAME_STMT);
              make_edge (cont_bb, l3_bb, EDGE_FALLTHRU);
              make_edge (cont_bb, l1_bb, 0);
              l2_bb =3D create_empty_bb (cont_bb);
              broken_loop =3D false;
            }
        }
and at least when the outermost for (;;) is missing, it works fine.=