如何在ARM Assembly中实现除法算法？

Question

我正在尝试在ARM程序集中实现以下算法，但是当我在ARMSim 1.9.1中运行我的代码时，它打印出的商和余数完全不变（在这种情况下为0和5）。有人能告诉我我做错了什么吗？我想这可能是我试图设置寄存器最右边的位。

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这是我的代码：

Given: Two positive integers: a Divisor X, and a Dividend Y
Use three General Purpose Registers (R, Q, X)
where R stores the Remainder, Q stores the Quotient, and X stores the Divisor. 
Steps:
    1. Copy Y into the Remainder register (R)
       Register Q will be initialized as 0 
    2. update: R =  R - X
    3. If R >= 0 then
        Shift the Quotient Register (Q) to the left (1 bit)
        and set the new rightmost bit to 1
       Else
        Restore the original value by of R:  R = R + X
            Also, Shift the Quotient Register (Q) to the left (1 bit)
            and set the new least significant bit to 0
    4. Shift the Divisor Register (X) to the right (1 bit)
    5. Repeat 31 more times