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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/106495] [13 Regression] Build fails
 gcc/tree-ssa-threadbackward.cc:22: gcc/vec.h:890:19: error: array subscript
 4294967294 is above array bounds of 'basic_block_def* [1]'
 [-Werror=array-bounds]
Date: Mon, 01 Aug 2022 12:33:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106495

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #53395|0                           |1
        is obsolete|                            |

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 53396
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53396&action=3Dedit
more reduced profitable_path_p

More reduced, the actual function is now simply

bool
back_threader_profitability::profitable_path_p (const vec<basic_block> &m_p=
ath,
      tree ,
      edge ,
      bool *)
{
  if (m_path.length () <=3D 1)
      return false;

  gimple *stmt =3D get_gimple_control_stmt (m_path[0]);
  estimate_num_insns (stmt, &eni_size_weights);

  edge entry =3D find_edge (m_path[m_path.length () - 1],
                          m_path[m_path.length () - 2]);
  if (probably_never_executed_edge_p ((cfun + 0), entry))
    return false;
  return true;
}=