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James Gregory 2013-12-30 15:11:04 +11:00
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<meta name="vspubdate" content="07/01/97" />
<meta name="vscategory" content="Web and Software Development: Game Development,Web and Software Development: Graphics and Multimedia Development" />
<title>Michael Abrash's Graphics Programming Black Book Special Edition: Local Optimization</title><!-- HEADER -->
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<title>Michael Abrash's Graphics Programming Black Book Special Edition: Local Optimization</title>
<meta name="chapter" content="07" />
<meta name="pages" content="136-139" />
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<p><br /></p>
<h2><a id="Heading1"></a>Chapter 7<br />
<h2 id="Heading1">Chapter 7<br />
Local Optimization</h2>
<h3><a id="Heading2"></a>Optimizing Halfway between Algorithms and Cycle Counting</h3>
<h3 id="Heading2">Optimizing Halfway between Algorithms and Cycle Counting</h3>
<p>You might not think it, but there&rsquo;s much to learn about performance programming from the Great Buffalo Sauna Fiasco. To wit:</p>
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<p>And yes, in case you&rsquo;re wondering, the above story is indeed true. Was I there? Let me put it this way: If I were, I&rsquo;d never admit it!</p>
<h4 align="left"><a id="Heading3"></a>When LOOP Is a Bad Idea</h4>
<h4 align="left" id="Heading3">When LOOP Is a Bad Idea</h4>
<p>Let&rsquo;s examine first an instruction that is less than it appears to be: <b>LOOP</b>. There&rsquo;s no mystery about what <b>LOOP</b> does; it decrements CX and branches if CX doesn&rsquo;t decrement to zero. It&rsquo;s so beautifully suited to the task of counting down loops that any experienced x86 programmer instinctively stuffs the loop count in CX and reaches for <b>LOOP</b> when setting up a loop. That&rsquo;s fine&mdash;<b>LOOP</b> does, of course, work as advertised&mdash;but there is one problem:</p>
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<div align="center">
Graphics Programming Black Book &copy; 2001 Michael Abrash
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