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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
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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="05-03.html">Previous</a></td>
<td>
<a href="05-03.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="05-05.html">Next</a></td>
<td>
<a href="05-05.html">Next</a>
</td>
</tr>
</table>
</center>
<p><br /></p>
<h3 id="Heading8">Interpreting Where the Cycles Go</h3>
<p>To boost the overall performance of Listing 5.1, I would normally convert <b>SearchForString()</b> to assembly language at this point. However, I&rsquo;m not going to do that, and the reason is as important a lesson as any discussion of optimized assembly code is likely to be. Take a moment to examine some interesting performance aspects of the C implementation, and all should become much clearer.</p>
@ -46,7 +49,7 @@
<p>Not likely.</p>
<h4 align="left" id="Heading9">Knowing When Assembly Is Pointless</h4>
<h4 id="Heading9">Knowing When Assembly Is Pointless</h4>
<p>So that&rsquo;s why we&rsquo;re not going to go to assembly language in this example&mdash;which is not to say it would never be worth converting the search engine in Listing 5.1 to assembly.</p>
@ -54,16 +57,20 @@
<p>In contrast, Listing 5.1 must return from <b>memchr()</b>, set up parameters, and call <b>memcmp()</b> in order to do the same thing. Likewise, assembly can switch back to <b>REPNZ SCASB</b> after a non-match much more quickly than Listing 5.1. The switching overhead is high; when searching a file completely filled with the character z for the string &ldquo;zy,&rdquo; Listing 5.1 takes almost 1/2 minute, or nearly an order of magnitude longer than when searching a file filled with normal text.</p>
<p><br /></p>
<center>
<table border="1">
<tr>
<td><a href="05-03.html">Previous</a></td>
<td>
<a href="05-03.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="05-05.html">Next</a></td>
<td>
<a href="05-05.html">Next</a>
</td>
</tr>
</table>
</center>