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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.doc29.html">Prev</a> | <a href="Instructions2.doc31.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><hr><br> <a name="ddiv"></a><h2>ddiv</h2><a name="ddiv.Operation"></a><b>Operation</b><br><a name="67577"></a>Divide <code>double</code><p><Table Border="3"><tr><td><a name="67576"></a> <i>ddiv</i><td><a name="87568"></a> </Table><Table><tr><td></Table><p><a name="ddiv.Forms"></a><b>Forms</b><br><a name="67578"></a><i>ddiv</i> = 111 (0x6f)<p><a name="ddiv.Stack"></a><b>Stack</b><br><a name="67579"></a>..., <i>value1.word1</i>, <i>value1.word2</i>, <i>value2.word1</i>, <i>value2.word2</i> <img src="chars/arrwdbrt.gif"> ..., <i>result.word1</i>, <i>result.word2</i><p><a name="ddiv.Description"></a><b>Description</b><br><a name="67580"></a>Both <i>value1</i> and <i>value2</i> must be of type <code>double</code>. The values are popped from the operand stack. The <code>double</code> <i>result</i> is <i>value1</i> / <i>value2</i>. The <i>result</i> is pushed onto the operand stack.<p><a name="67581"></a>The result of a <i>ddiv</i> instruction is governed by the rules of IEEE arithmetic:<p><ul><a name="67582"></a><li>If either value is NaN, the result is NaN.<a name="67583"></a><li>If neither value is NaN, the sign of the result is positive if both values have the same sign, negative if the values have different signs.<a name="67584"></a><li>Division of an infinity by an infinity results in NaN.<a name="67585"></a><li>Division of an infinity by a finite value results in a signed infinity, with the sign-producing rule just given.</ul><hr><!-- This inserts footnotes--><p><a href="VMSpecTOC.doc.html">Contents</a> | <a href="Instructions2.doc29.html">Prev</a> | <a href="Instructions2.doc31.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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