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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Opcode AAD</TITLE></HEAD><BODY><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="AAA.htm"> AAA ASCII Adjust after Addition</A><BR><B>next:</B><A HREF="AAM.htm"> AAM ASCII Adjust AX after Multiply</A><P><HR><P><H1>AAD -- ASCII Adjust AX before Division</H1><PRE>Opcode Instruction Clocks DescriptionD5 0A AAD 19 ASCII adjust AX before division</PRE><H2>Operation</H2><PRE>AL := AH * 10 + AL;AH := 0;</PRE><H2>Description</H2>AAD is used to prepare two unpacked BCD digits (the least-significantdigit in AL, the most-significant digit in AH) for a division operation thatwill yield an unpacked result. This is accomplished by setting AL toAL + (10 * AH), and then setting AH to 0. AX is then equal to the binaryequivalent of the original unpacked two-digit number.<H2>Flags Affected</H2>SF, ZF, and PF as described in <A HREF="appc.htm">Appendix C</A>; OF, AF, and CF are undefined<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="AAA.htm"> AAA ASCII Adjust after Addition</A><BR><B>next:</B><A HREF="AAM.htm"> AAM ASCII Adjust AX after Multiply</A></BODY>⌨️ 快捷键说明
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