Assembly 装配-更换箱

我在用AT&T的语法写作。 这个循环应该检查，如果大小写在61-7A ASCII范围内（它的意思是这个小写字母）-如果否，则将其转换为空格“”

change:
    movb (%esi), %bh        #move case temporary to bh register
    cmp $0x61,%bh           #compare 'a' ASCII and case from bh register
    jge nothing             #if ascii from bh is greater than 'a', jump to nothing
    cmp $0x7A,%bh
    jle nothing             #same, if is in range 61-7A jump to nothing
    movb $0x20,%bh          #if wasn't in range, change to 20 ASCII (space)
nothing:
    movb %bh, (%esi)        #put case back into string
    addl $1,%esi            #move pointer to the next case
    loop change

这是我的循环。ESI是指向字符串的指针

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我的问题很简单——这不起作用，我不知道为什么

第一个条件跳转错误

change:
    movb (%esi), %bh        #move case temporary to bh register
    cmp $0x61,%bh           #compare 'a' ASCII and case from bh register
    jl space             #if ascii from bh is greater than 'a', jump to nothing
    cmp $0x7A,%bh
    jle nothing             #same, if is in range 61-7A jump to nothing
space: 
   movb $0x20,%bh          #if wasn't in range, change to 20 ASCII (space)
nothing:
    movb %bh, (%esi)        #put case back into string
    addl $1,%esi            #move pointer to the next case
    loop change

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您的

nic

标签在哪里定义？您也可以只说

inc%esi

而不是

addl$1，%esi

。保存一些指令字节/周期。：）我的错误，抱歉-nic的意思是“没什么”，我把它从波兰语翻译过来，忘了更改。