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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.doc24.html">Prev</a> | <a href="Instructions2.doc26.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><hr><br> <a name="dadd"></a><h2>dadd</h2><ul><a name="67499"></a><li>The sum of two zeroes of the same sign is the zero of that sign.<a name="67500"></a><li>The sum of a zero and a nonzero finite value is equal to the nonzero value.<a name="166923"></a><li>The sum of two nonzero finite values of the same magnitude and opposite sign is positive zero.<a name="166924"></a><li>In the remaining cases, where neither an infinity, nor a zero, nor NaN is involved, and the values have the same sign or have different magnitudes, the sum is computed and rounded to the nearest representable value using IEEE 754 round-to-nearest mode. If the magnitude is too large to represent as a <code>double</code>, we say the operation overflows; the result is then an infinity of appropriate sign. If the magnitude is too small to represent as a <code>double</code>, we say the operation underflows; the result is then a zero of appropriate sign. </ul><a name="67503"></a>The Java Virtual Machine requires support of gradual underflow as defined by IEEE 754. Despite the fact that overflow, underflow, or loss of precision may occur, execution of a <i>dadd</i> instruction never throws a runtime exception.<p><hr><!-- This inserts footnotes--><p><a href="VMSpecTOC.doc.html">Contents</a> | <a href="Instructions2.doc24.html">Prev</a> | <a href="Instructions2.doc26.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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