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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.doc63.html">Prev</a> | <a href="Instructions2.doc65.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><hr><br> <a name="fneg"></a><h2>fneg</h2><a name="fneg.Operation"></a><b>Operation</b><br><a name="68108"></a>Negate <code>float</code><p><Table Border="3"><tr><td><a name="68107"></a> <i>fneg</i><td><a name="87568"></a> </Table><Table><tr><td></Table><p><a name="fneg.Forms"></a><b>Forms</b><br><a name="68109"></a><i>fneg</i> = 118 (0x76)<p><a name="fneg.Stack"></a><b>Stack</b><br><a name="68110"></a>..., <i>value</i><em> </em><img src="chars/arrwdbrt.gif"> ..., <i>result</i><p><a name="fneg.Description"></a><b>Description</b><br><a name="68111"></a>The <i>value</i> must be of type <code>float</code>. It is popped from the operand stack. The <code>float</code> <i>result</i> is the arithmetic negation of <i>value</i>, -<i>value</i>. The <i>result</i> is pushed onto the operand stack.<p><a name="68112"></a>For <code>float</code> values, negation is not the same as subtraction from zero. If <code>x</code> is <code>+0.0</code>, then <code>0.0-x</code> equals <code>+0.0</code>, but <code>-x</code> equals <code>-0.0</code>. Unary minus merely inverts the sign of a <code>float</code>. <p><a name="68113"></a>Special cases of interest:<p><ul><a name="68114"></a><li>If the operand is NaN, the result is NaN (recall that NaN has no sign).<a name="68115"></a><li>If the operand is an infinity, the result is the infinity of opposite sign.<a name="68116"></a><li>If the operand is a zero, the result is the zero of opposite sign.</ul><hr><!-- This inserts footnotes--><p><a href="VMSpecTOC.doc.html">Contents</a> | <a href="Instructions2.doc63.html">Prev</a> | <a href="Instructions2.doc65.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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