★、清进位指令CLC(ClearCarry Flag):CF←0
★、置进位指令STC(Set CarryFlag):CF←1
★、进位取反指令CMC(ComplementCarry Flag):CF←not CF
★、清方向位指令CLD(ClearDirection Flag):DF←0
★、置方向位指令STD(SetDirection Flag):DF←1
★、清中断允许位指令CLI(ClearInterrupt Flag):IF←0
其功能是不允许可屏蔽的外部中断来中断其后程序段的执行。
★、置中断允许位指令STI(SetInterrupt Flag):IF←1
其功能是恢复可屏蔽的外部中断的中断响应功能,通常是与CLI成对使用的。
★、LAHF(LoadAH from Flags):AH←Flags的低8位
★、SAHF(Store AH in Flags):Flags的低8位←AH
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★、PUSHF/PUSHFD(PushFlags onto Stack):把16位/32位标志寄存器进栈;
★、POPF/POPFD(Pop Flags offStack):把16位/32位标志寄存器出栈;
本文详细介绍了汇编语言中CLC指令用于清除进位标志CF,以及与其相关的置进位、进位取反指令。同时,还讲解了方向位DF、中断允许位IF的操作指令,包括取标志位、标志位堆栈操作等关键概念,对于理解汇编语言的控制流程至关重要。
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