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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.doc152.html">Prev</a> | <a href="Instructions2.doc154.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><hr><br> <a name="lsub"></a><h2>lsub</h2><a name="lsub.Operation"></a><b>Operation</b><br><a name="69662"></a>Subtract <code>long</code><p><Table Border="3"><tr><td><a name="69661"></a> <i>lsub</i><td><a name="87568"></a> </Table><Table><tr><td></Table><p><a name="lsub.Forms"></a><b>Forms</b><br><a name="69663"></a><i>lsub</i> = 101 (0x65)<p><a name="lsub.Stack"></a><b>Stack</b><br><a name="69664"></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="lsub.Description"></a><b>Description</b><br><a name="69665"></a>Both <i>value1</i> and <i>value2</i> must be of type <code>long</code>. The values are popped from the operand stack. The <code>long</code> <i>result</i> is <i>value1</i> - <i>value2</i>. The <i>result</i> is pushed onto the operand stack.<p><a name="69666"></a>For <code>long</code> subtraction, <code>a</code>-<code>b</code> produces the same result as <code>a</code>+<code>(</code>-<code>b)</code>. For <code>long</code> values, subtraction from zero is the same as negation.<p><a name="69667"></a>Despite the fact that overflow or underflow may occur, in which case the <i>result</i> may have a different sign than the true mathematical result, execution of an <i>lsub</i> instruction never throws a runtime exception.<p><hr><!-- This inserts footnotes--><p><a href="VMSpecTOC.doc.html">Contents</a> | <a href="Instructions2.doc152.html">Prev</a> | <a href="Instructions2.doc154.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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