[Bug middle-end/101809] emulated gather capability doesn't support 32-bit target

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101809

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
It fails in get_load_store_type:

          else if (!TYPE_VECTOR_SUBPARTS (vectype).is_constant ()
                   || !known_eq (TYPE_VECTOR_SUBPARTS (vectype),
                                 TYPE_VECTOR_SUBPARTS
                                   (gs_info->offset_vectype)))
            {
              if (dump_enabled_p ())
                dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
                                 "unsupported vector types for emulated "
                                 "gather.\n");
              return false;
            }

For V2DF gather, we need V2DI index.  But for -m32, index is V4SI.