循环汇编语言 [英] Looping in assembly language

问题描述

如何使用循环和/或跳转在汇编中转换此C#代码

how do I translate this C# code in assembly using loops and/or jumps

        int sum = 0;
        int count = 15;

        while (count != 0)
        {
            if (count % 2 != 0)
                sum = sum + count;
            count--;
        }

        Console.WriteLine(sum);

推荐答案

通常是"while"

a "while" is usually

L_repeat:
    compare while_condition
    jumpIfFalse L_exit

    ... loop body ...

    jump L_repeat
L_exit:

如果是，还必须反转条件:

also for an if, you have to invert the condition:

compare if_condition
jumpIfFalse L_skip

 ... inside if

L_skip:

然后您需要注册，一个要保存您的数量，一个要进行总和，然后显示以下内容:

then you need to Registers, one to hold your count, one for the sum, and come out with something like this:

mov Rsum,0
mov Rcount,15

L_repeat:
   cmp Rcount,0
   jz L_exit          ; jump if not (Rcount != 0) gets jump if Rcount==0
       mov Rtemp, Rcount
       and Rtemp, 1
       jz L_skip
       add Rsum, Rcount
    L_skip:
       dec Rcount
       jmp L_repeat
l_exit:    

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