How to create one type per arch in target descrption

["H.J. Lu" <hjl dot tools at gmail dot com>]

x86 has i387_ext. I added

   case TDESC_TYPE_I387_EXT:
      return arch_float_type (gdbarch, -1, "builtin_type_i387_ext",
                              floatformats_i387_ext);

to tdesc_gdb_type. I would up 8 i387_ext types at different addresses
with the same bits. x86 does

if (i386_fp_regnum_p (gdbarch, regnum))
    {
      /* Floating point registers must be converted unless we are
         accessing them in their hardware type.  */
      if (type == i387_ext_type (gdbarch))
        return 0;
      else
        return 1;
    }

It expects 2  i387_ext types should have the same address. Ha
can I cache the i387_ext type for single gdbarch?

Thanks.


-- 
H.J.