浅析汇编语言中数大小的比较

Shallow Size Comparison in Assembler Language

在汇编语言中,对于数据谁大谁小的判断是经常会碰到的,数大小的判断包括判断两个无符号数之间的大小,也包括判断两个带符号数之间的大小,对于前者的判断可通过进位标志位CF来判断,但对于后者却要涉及到对符号标志位SF以及溢出标志位OF这两个状态标志位的综合分析,所以这两种数的处理方法是不一样的,如果混为一谈是很容易出错的,因此数大小的判断在汇编中必须值得注意。

Number in assembler language,who is the greater,are often encountered.The judgment for size of number include judgment between two unsigned number and judgment between two signed number.For the former,the judgment only depend on CF,Carry Flag,but for the latter,it will involve two state flag's comprehensive analysis including SF,Signal Flag,and OF,Overflow Flag.So the processing methods of the two kinds of number are not same,if they are confused,mistakes will be made.Therefore,judgment of the size of the number in assembly must be noted.