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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@ -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="21-01.html">Previous</a></td>
<td>
<a href="21-01.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="21-03.html">Next</a></td>
<td>
<a href="21-03.html">Next</a>
</td>
</tr>
</table>
</center>
<p><br /></p>
<p>As on the 486, you should keep a careful eye out for AGIs involving the stack pointer. Implicit modifiers of ESP, such as <b>PUSH</b> and <b>POP</b>, are special-cased so you don&rsquo;t have to worry about AGIs. However, if you explicitly modify ESP with this instruction</p>
<pre>
sub esp,100h
@ -92,7 +95,7 @@ mov al,[Var] ;U-pipe cycle 2
<p>where an attempt is made to set both EAX and its AL subregister on the same cycle. Write-after-write contention implies that the two instructions comprising the above substitute for <b>MOVZX</b> should have at least one unrelated instruction between them when <b>SUB EAX,EAX</b> executes in the V-pipe.</p>
<h4 align="left" id="Heading5">Exceptions to Register Contention</h4>
<h4 id="Heading5">Exceptions to Register Contention</h4>
<p>Intel has special-cased some very useful exceptions to register contention. Happily, write-after-read operations do <i>not</i> cause contention. Such operations, as in</p>
<pre>
@ -140,16 +143,20 @@ LoopTop:
; pair in the U-pipe
</pre>
<p><br /></p>
<center>
<table border="1">
<tr>
<td><a href="21-01.html">Previous</a></td>
<td>
<a href="21-01.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="21-03.html">Next</a></td>
<td>
<a href="21-03.html">Next</a>
</td>
</tr>
</table>
</center>