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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.doc118.html">Prev</a> | <a href="Instructions2.doc120.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><hr><br> <a name="ishr"></a><h2>ishr</h2><a name="ishr.Operation"></a><b>Operation</b><br><a name="69055"></a>Arithmetic shift right <code>int</code><p><Table Border="3"><tr><td><a name="69054"></a> <i>ishr</i><td><a name="87568"></a> </Table><Table><tr><td></Table><p><a name="ishr.Forms"></a><b>Forms</b><br><a name="69056"></a><i>ishr</i><em> </em>= 122 (0x7a)<p><a name="ishr.Stack"></a><b>Stack</b><br><a name="69057"></a>..., <i>value1</i><em>, </em><i>value2</i> <img src="chars/arrwdbrt.gif"> ..., <i>result</i><p><a name="ishr.Description"></a><b>Description</b><br><a name="69058"></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 sign 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="ishr.Notes"></a><b>Notes</b><br><a name="69062"></a>The resulting value is <img src="Instructions2.doc.anc9.gif">, where <i>s</i> is <i>value2</i> &amp; 0x1f. For nonnegative <i>value1</i>, this is equivalent to truncating <code>int</code> division by 2 to the power <code>s</code>. The shift distance actually used is always in the range 0 to 31, inclusive, as if <i>value2</i> were subjected to a bitwise logical AND with the mask value 0x1f. <p><hr><!-- This inserts footnotes--><p><a href="VMSpecTOC.doc.html">Contents</a> | <a href="Instructions2.doc118.html">Prev</a> | <a href="Instructions2.doc120.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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