对应iu的自增操作，需要mem支持相应的pattern模板

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对应iu的自增操作，需要mem支持相应的pattern模板; 否则attempt_change中的检查会失败

242 (define_memory_constraint "Zmu"243 ".iu for the scalar load/store instruction"244  (and (match_code "mem")245       (match_test("GET_RTX_CLASS (GET_CODE (XEXP (op,0))) == RTX_AUTOINC246                    && (GET_CODE (XEXP (op, 0)) == PRE_INC247                    || GET_CODE (XEXP (op, 0)) == PRE_DEC248                    || GET_CODE (XEXP (op, 0))== PRE_MODIFY)"))))

具体和后端的关联方式；

  if (! validate_change (mem_insn.insn, mem_insn.mem_loc, new_mem, 0))    {      if (dump_file) fprintf (dump_file, "validation failure\n");      return false;    }

公共代码不需要做调整%G0

@@ -974,8 +974,8 @@ ;; L16U* and L16S* diff from the original meaning of intrinsics ??  (define_insn "movhi_internal"+  [(set (match_operand:HI 0 "hidsp_move_operand" "=r,r,r,r,r,Zmu,Zms")+        (match_operand:HI 1 "move_operand" "r,I,i,Zml,Zmn,r,r"))]   "hidsp_valid_move (HImode, operands)"   "@    or@%.\t\t%0, %1, %1+   s16%G0@ags\t%1, %0    s16%G0@ags\t%1, %0"

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