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Strip comments and inline ids onto h*

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James Gregory 2013-12-30 15:11:04 +11:00
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11-07.html
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@ -10,16 +10,9 @@
<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: Pushing the 286 and 386</title><!-- HEADER -->
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<!--ISBN=1576101746//-->
<!--TITLE=Michael Abrash's Graphics Programming Black Book Special Edition//-->
<!--AUTHOR=Michael Abrash//-->
<!--PUBLISHER=The Coriolis Group, Inc.//-->
<title>Michael Abrash's Graphics Programming Black Book Special Edition: Pushing the 286 and 386</title>
<meta name="chapter" content="11" />
<meta name="pages" content="224-226" />
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</head>
<body>
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<p><br /></p>
<p><b>LISTING 11.5 L11-5.ASM</b></p><!-- CODE //-->
<p><b>LISTING 11.5 L11-5.ASM</b></p>
<pre>
;
; *** Listing 11.5 ***
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add [WordVar]100h
endm
call ZTimerOff
</pre><!-- END CODE //-->
</pre>
<p>What&rsquo;s going on? Simply this: Instruction fetching is controlling overall execution time on <i>both</i> processors. Both the 8088 in a PC and the 286 in an AT can execute the bytes of the instructions in Listings 11.4 and 11.5 faster than they can be fetched. Since the instructions are exactly the same lengths on both processors, it stands to reason that the ratio of the overall execution times of the instructions should be the same on both processors as well. Instruction length controls execution time, and the instruction lengths are the same&mdash;therefore the ratios of the execution times are the same. The 286 can both fetch and execute instruction bytes faster than the 8088 can, so code executes much faster on the 286; nonetheless, because the 286 can also execute those instruction bytes much faster than it can fetch them, overall performance is still largely determined by the size of the instructions.</p>
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<p>The more things change, the more they remain the same....</p>
<h4 align="left"><a id="Heading17"></a>POPF and the 286</h4>
<h4 align="left" id="Heading17">POPF and the 286</h4>
<p>We&rsquo;ve one final 286-related item to discuss: the hardware malfunction of <b>POPF</b> under certain circumstances on the 286.</p>
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<div align="center">
Graphics Programming Black Book &copy; 2001 Michael Abrash
</div><!-- all of the reference materials (books) have the footer and subfoot reveresed -->
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</body>
</html>