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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/111764] [11/12/13/14 Regression] Wrong code
 at -O3 on x86_64-linux-gnu
Date: Wed, 11 Oct 2023 13:47:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111764

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
              /* Try to simplify the vector initialization by applying an
                 adjustment after the reduction has been performed.  */
              if (!reduc_info->reused_accumulator
                  && STMT_VINFO_DEF_TYPE (stmt_info) =3D=3D vect_reduction_=
def
                  && !operand_equal_p (neutral_op, initial_def))
                {
                  STMT_VINFO_REDUC_EPILOGUE_ADJUSTMENT (reduc_info)
                    =3D initial_def;
                  initial_def =3D neutral_op;
                }

maybe just allow PLUS/MINUS_EXPR here.  Maybe it's all premature ...=