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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.doc125.html">Prev</a> | <a href="Instructions2.doc127.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><hr><br> <a name="l2d"></a><h2>l2d</h2><a name="l2d.Operation"></a><b>Operation</b><br><a name="69207"></a>Convert <code>long</code> to <code>double</code><p><Table Border="3"><tr><td><a name="69206"></a> <i>l2d</i><td><a name="87568"></a> </Table><Table><tr><td></Table><p><a name="l2d.Forms"></a><b>Forms</b><br><a name="69208"></a><i>l2d</i> = 138 (0x8a)<p><a name="l2d.Stack"></a><b>Stack</b><br><a name="69209"></a>..., <i>value.word1</i>, <i>value.word2</i> <img src="chars/arrwdbrt.gif"> ..., <i>result.word1</i>, <i>result.word2</i><p><a name="l2d.Description"></a><b>Description</b><br><a name="69210"></a>The <i>value</i> on the top of the operand stack must be of type <code>long</code>. It is popped from the operand stack and converted to a <code>double</code> <i>result</i> using IEEE 754 round-to-nearest mode. The <i>result</i> is pushed onto the operand stack.<p><a name="l2d.Notes"></a><b>Notes</b><br><a name="69211"></a>The <i>l2d</i> instruction performs a widening primitive conversion <a href="Concepts.doc.html#23435">(§2.6.2)</a> that may lose precision because type <code>double</code> has only 53 mantissa bits.<p><hr><!-- This inserts footnotes--><p><a href="VMSpecTOC.doc.html">Contents</a> | <a href="Instructions2.doc125.html">Prev</a> | <a href="Instructions2.doc127.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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