50 lines
2.1 KiB
HTML
50 lines
2.1 KiB
HTML
<html><!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
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<html>
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<head>
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<title>80386 Programmer's Reference Manual -- Opcode MOVZX</title>
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</head>
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<body>
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<b>up:</b> <a href="C17.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/C17.HTM">Chapter 17 -- 80386 Instruction Set</a><br>
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<b>prev:</b><a href="MOVSX.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/MOVSX.HTM"> MOVSX Move with Sign-Extend</a><br>
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<b>next:</b><a href="MUL.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/MUL.HTM"> MUL Unsigned Multiplication of AL or AX</a>
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<p>
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<hr>
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<p>
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<h1>MOVZX -- Move with Zero-Extend</h1>
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<pre>
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Opcode Instruction Clocks Description
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0F B6 /r MOVZX r16,r/m8 3/6 Move byte to word with zero-extend
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0F B6 /r MOVZX r32,r/m8 3/6 Move byte to dword, zero-extend
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0F B7 /r MOVZX r32,r/m16 3/6 Move word to dword, zero-extend
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</pre>
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<h2>Operation</h2>
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<pre>
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DEST := ZeroExtend(SRC);
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</pre>
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<h2>Description</h2>
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MOVZX reads the contents of the effective address or register as a byte or a word, zero extends the value to the operand-size attribute of the instruction (16 or 32 bits), and stores the result in the destination register.
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<h2>Flags Affected</h2>
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None
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<h2>Protected Mode Exceptions</h2>
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#GP(0) for an illegal memory operand effective address in the CS, DS, ES, FS, or GS segments; #SS(0) for an illegal address in the SS segment; #PF(fault-code) for a page fault
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<h2>Real Address Mode Exceptions</h2>
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Interrupt 13 if any part of the operand would lie outside of the effective address space from 0 to 0FFFFH
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<h2>Virtual 8086 Mode Exceptions</h2>
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Same exceptions as in Real Address Mode; #PF(fault-code) for a page fault
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<p>
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<hr>
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<p><b>up:</b> <a href="C17.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/C17.HTM">Chapter 17 -- 80386 Instruction Set</a><br>
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<b>prev:</b><a href="MOVSX.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/MOVSX.HTM"> MOVSX Move with Sign-Extend</a><br>
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<b>next:</b><a href="MUL.HTM" tppabs="http://webster.cs.ucr.edu/Page_TechDocs/Doc386/MUL.HTM"> MUL Unsigned Multiplication of AL or AX</a>
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</body>
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