我尝试运行此代码并打印结果，但由于某种原因，我收到以下错误消息：

main.asm:10: error: invalid operands in non-64-bit mode 
main.asm:11: error: invalid operands in non-64-bit mode
main.asm:12: error: invalid operands in non-64-bit mode
main.asm:13: error: invalid operands in non-64-bit mode
ld: cannot find *.o: No such file or directory

这是代码：

global _start       
section .data
    n DB 10
section .text
_start:
    xor ax, ax
    mov bx, 1
    mov cx, (n)
.L1:
    mov r9w, bx    #one of the lines that leads to an error
    imul r9w, bx   #one of the lines that leads to an error
    imul r9w, bx   #one of the lines that leads to an error
    add ax, r9w    #one of the lines that leads to an error
    inc bx
    dec cx
    test cx, cx
    jne .L1
    
    movq rax, 1
    movq rdi, 1
    movq rsi, ax
    movq rdx, 8
    syscall

    xor rax, rax
    ret
END:

我是一个相当新的组装，不能完全理解问题是什么-BX寄存器是16位，R9 W也是16位...
我使用在线编译器来运行这个（https://www.tutorialspoint.com/compile_assembly_online.php）