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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.doc117.html">Prev</a> | <a href="Instructions2.doc119.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><hr><br> <a name="ishl"></a><h2>ishl</h2><a name="ishl.Operation"></a><b>Operation</b><br><a name="69041"></a>Shift left <code>int</code><p><Table Border="3"><tr><td><a name="69040"></a> <i>ishl</i><td><a name="87568"></a> </Table><Table><tr><td></Table><p><a name="ishl.Forms"></a><b>Forms</b><br><a name="69042"></a><i>ishl</i> = 120 (0x78)<p><a name="ishl.Stack"></a><b>Stack</b><br><a name="69043"></a>..., <i>value1</i><em>, </em><i>value2</i> <img src="chars/arrwdbrt.gif"> ..., <i>result</i><p><a name="ishl.Description"></a><b>Description</b><br><a name="69044"></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> left by <em>s</em> bit positions, 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="ishl.Notes"></a><b>Notes</b><br><a name="69045"></a>This is equivalent (even if overflow occurs) to multiplication by 2 to the power <em>s</em>. 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.doc117.html">Prev</a> | <a href="Instructions2.doc119.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 © 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>⌨️ 快捷键说明
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