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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.doc23.html">Prev</a> | <a href="Instructions2.doc25.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><hr><br> <a name="dadd"></a><h2>dadd</h2><a name="dadd.Operation"></a><b>Operation</b><br><a name="67489"></a>Add <code>double</code><p><Table Border="3"><tr><td><a name="67488"></a> <i>dadd</i><td><a name="87568"></a> </Table><Table><tr><td></Table><p><a name="dadd.Forms"></a><b>Forms</b><br><a name="67490"></a><i>dadd</i> = 99 (0x63)<p><a name="dadd.Stack"></a><b>Stack</b><br><a name="67491"></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="dadd.Description"></a><b>Description</b><br><a name="67492"></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="67493"></a>The result of a <i>dadd</i> instruction is governed by the rules of IEEE arithmetic:<p><ul><a name="67494"></a><li>If either value is NaN, the result is NaN.<a name="67495"></a><li>The sum of two infinities of opposite sign is NaN.<a name="67496"></a><li>The sum of two infinities of the same sign is the infinity of that sign.<a name="67497"></a><li>The sum of an infinity and any finite value is equal to the infinity.<a name="67498"></a><li>The sum of two zeroes of opposite sign is positive zero.</ul><hr><!-- This inserts footnotes--><p><a href="VMSpecTOC.doc.html">Contents</a> | <a href="Instructions2.doc23.html">Prev</a> | <a href="Instructions2.doc25.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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