Misc/abrash-black-book
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Retidy, removing align=left from headings and empty paragraphs

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James Gregory 2013-12-30 15:37:13 +11:00
commit a96a114403
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13-04.html
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@ -1,5 +1,4 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
@ -19,17 +18,21 @@
<center>
<table border="1">
<tr>
<td><a href="13-03.html">Previous</a></td>
<td>
<a href="13-03.html">Previous</a>
</td>
<td><a href="index.html">Table of Contents</a></td>
<td>
<a href="index.html">Table of Contents</a>
</td>
<td><a href="14-01.html">Next</a></td>
<td>
<a href="14-01.html">Next</a>
</td>
</tr>
</table>
</center>
<p><br /></p>
<h3 id="Heading7">32-Bit Addressing Modes</h3>
<p>The 386 and 486 both support 32-bit addressing modes, in which any register may serve as the base memory addressing register, and almost any register may serve as the potentially scaled index register. For example,</p>
@ -77,16 +80,20 @@ LoopTop:
<p>Lastly, as I mentioned, ESP cannot be scaled. In fact, ESP cannot be an index register; it must be a base register. Ironically, however, ESP is the one register that cannot be used to address memory without the presence of an SIB byte, even if it&rsquo;s used without an index register. This is an outcome of the way in which the SIB byte extends the capabilities of the Mod-R/M byte, and there&rsquo;s nothing to be done about it, but it&rsquo;s at least worth noting that ESP-based, non-indexed addressing makes for instructions that are a byte larger than other non-indexed addressing (but not any slower; there&rsquo;s no 1-cycle penalty for using ESP as a base register) on the 486.</p>
<p><br /></p>
<center>
<table border="1">
<tr>
<td><a href="13-03.html">Previous</a></td>
<td>
<a href="13-03.html">Previous</a>
</td>
<td><a href="index.html">Table of Contents</a></td>
<td>
<a href="index.html">Table of Contents</a>
</td>
<td><a href="14-01.html">Next</a></td>
<td>
<a href="14-01.html">Next</a>
</td>
</tr>
</table>
</center>