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📁 Jvm 规范说明。The Java Virtual Machine was designed to support the Java programming language. Some concep

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<html><head><title>VM Spec  </title></head><body BGCOLOR=#eeeeff text=#000000 LINK=#0000ff VLINK=#000077 ALINK=#ff0000> <a href="VMSpecTOC.doc.html">Contents</a> | <a href="Instructions2.doc122.html">Prev</a> | <a href="Instructions2.doc124.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><hr><br> <a name="iushr"></a><h2>iushr</h2><a name="iushr.Operation"></a><b>Operation</b><br><a name="69123"></a>Logical shift right<p><Table Border="3"><tr><td><a name="69122"></a> <i>iushr</i><td><a name="87568"></a> </Table><Table><tr><td></Table> <code>int</code><p><a name="iushr.Forms"></a><b>Forms</b><br><a name="69124"></a><i>iushr</i> = 124 (0x7c)<p><a name="iushr.Stack"></a><b>Stack</b><br><a name="69125"></a>..., <i>value1</i><em>, </em><i>value2</i> <img src="chars/arrwdbrt.gif"> ..., <i>result</i><p><a name="iushr.Description"></a><b>Description</b><br><a name="69126"></a>Both <i>value1</i> and <i>value2</i> must be of type <code>int</code>. The values are popped from the operand stack. An <code>int</code> <i>result</i> is calculated by shifting <i>value1</i> right by <em>s</em> bit positions, with zero extension, where <em>s</em> is the value of the low five bits of <i>value2</i>. The <i>result</i> is pushed onto the operand stack.<p><a name="iushr.Notes"></a><b>Notes</b><br><a name="100222"></a>If <em>value1</em> is positive and <code>s</code> is <i>value2</i> &amp; 0x1f, the result is the same as that of <i>value1</i> >> <code>s</code>; if <i>value1</i> is negative, the result is equal to the value of the expression (<i>value1</i> >> <code>s</code>) + (2 << ~<code>s</code>). The addition of the (2 << ~<code>s</code>) term cancels out the propagated sign bit. The shift distance actually used is always in the range 0 to 31, inclusive.<p><hr><!-- This inserts footnotes--><p><a href="VMSpecTOC.doc.html">Contents</a> | <a href="Instructions2.doc122.html">Prev</a> | <a href="Instructions2.doc124.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><p><font size=-1>Java Virtual Machine Specification (HTML generated by dkramer on February 25, 1997)<br><i><a href="Copyright.doc.html">Copyright &#169 1996 Sun Microsystems, Inc.</a>All rights reserved</i><br>Please send any comments or corrections to <a href="mailto:doug.kramer@sun.com">doug.kramer@sun.com</a></font></body></html>

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