[Bug tree-optimization/111764] [11/12/13/14 Regression] Wrong code at -O3 on x86_64-linux-gnu

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111764

--- 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) == vect_reduction_def
                  && !operand_equal_p (neutral_op, initial_def))
                {
                  STMT_VINFO_REDUC_EPILOGUE_ADJUSTMENT (reduc_info)
                    = initial_def;
                  initial_def = neutral_op;
                }

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