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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.doc148.html">Prev</a> | <a href="Instructions2.doc150.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><hr><br> <a name="lshl"></a><h2>lshl</h2><a name="lshl.Operation"></a><b>Operation</b><br><a name="69598"></a>Shift left<p><Table Border="3"><tr><td><a name="69597"></a> <i>lshl</i><td><a name="87568"></a> </Table><Table><tr><td></Table> <code>long</code><p><a name="lshl.Forms"></a><b>Forms</b><br><a name="69599"></a><i>lshl</i> = 121 (0x79)<p><a name="lshl.Stack"></a><b>Stack</b><br><a name="69600"></a>..., <i>value1.word1</i>, <i>value1.word2</i>, <i>value2</i> <img src="chars/arrwdbrt.gif"> ..., <i>result.word1</i>, <i>result.word2</i><p><a name="lshl.Description"></a><b>Description</b><br><a name="69601"></a>The <i>value1</i> must be of type <code>long</code> and <i>value2</i> must be of type <code>int</code>. The values are popped from the operand stack. A <code>long</code> <i>result</i> is calculated by shifting <i>value1</i> left by <em>s</em> bit positions, where <em>s</em> is the low six bits of <i>value2</i>. The <i>result</i> is pushed onto the operand stack.<p><a name="lshl.Notes"></a><b>Notes</b><br><a name="69602"></a>This is equivalent (even if overflow occurs) to multiplication by 2 to the power<em> </em><em>s</em>. The shift distance actually used is therefore always in the range 0 to 63, inclusive, as if <i>value2</i> were subjected to a bitwise logical AND with the mask value 0x3f. <p><hr><!-- This inserts footnotes--><p><a href="VMSpecTOC.doc.html">Contents</a> | <a href="Instructions2.doc148.html">Prev</a> | <a href="Instructions2.doc150.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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