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LAHF.htm
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LAHF.htm
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML>
<HEAD>
<TITLE>80386 Programmer's Reference Manual -- Opcode LAHF</TITLE>
</HEAD>
<BODY STYLE="width:80ch">
<B>up:</B> <A HREF="c17.htm">
Chapter 17 -- 80386 Instruction Set</A><BR>
<B>prev:</B><A HREF="JMP.htm"> JMP Jump</A><BR>
<B>next:</B><A HREF="LAR.htm"> LAR Load Access Rights Byte</A>
<P>
<HR>
<P>
<H1>LAHF -- Load Flags into AH Register</H1>
<PRE>
Opcode Instruction Clocks Description
9F LAHF 2 Load: AH := flags SF ZF xx AF xx PF xx CF
</PRE>
<H2>Operation</H2>
<PRE>
AH := SF:ZF:xx:AF:xx:PF:xx:CF;
</PRE>
<H2>Description</H2>
LAHF transfers the low byte of the flags word to AH. The bits, from
MSB to LSB, are sign, zero, indeterminate, auxiliary, carry,
indeterminate, parity, indeterminate, and carry.
<H2>Flags Affected</H2>
None
<H2>Protected Mode Exceptions</H2>
None
<H2>Real Address Mode Exceptions</H2>
None
<H2>Virtual 8086 Mode Exceptions</H2>
None
<P>
<HR>
<P>
<B>up:</B> <A HREF="c17.htm">
Chapter 17 -- 80386 Instruction Set</A><BR>
<B>prev:</B><A HREF="JMP.htm"> JMP Jump</A><BR>
<B>next:</B><A HREF="LAR.htm"> LAR Load Access Rights Byte</A>
</BODY>