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core/com.nokia.carbide.cpp.compiler.doc.user/html/pragmas_x86/p_mmx.htm
author Deepak Modgil <Deepak.Modgil@Nokia.com>
Fri, 03 Apr 2009 23:33:03 +0100
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"><html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
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<meta name="LASTUPDATED" content="06/17/05 11:09:43" />
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<title>mmx</title>
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<link rel="StyleSheet" href="../../book.css" type="text/css"/>
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<h3>mmx</h3>
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<p>  Controls special code generation Intel MMX extensions.</p>
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<h5>Syntax</h5>
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  <p class="code">#pragma mmx on | off | reset</p>
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  <h5>Targets</h5>
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  Intel x86<br />
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  <h5>Remarks</h5>
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  <p>This pragma tells the x86 compiler to generate Intel MMX extension code that only runs on processors that have with the circuitry needed to execute the more than 50 specialized MMX instructions.</p>
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  <p class="note"><strong>NOTE</strong> When enabled, the autovectorize loops option (<span class="code">#pragma opt_vectorize_loops on</span>) will use these instructions if possible.</p>
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  <p>This pragma corresponds to the MMX setting in the Extended Instruction Set menu of the x86 CodeGen panel.  To check this setting, use <span class="code">__option (mmx)</span>, described in <a href="../symbols/sym_settings.htm">Checking Settings</a>.<br />
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</p>
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  <div id="footer">Copyright &copy; 2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. <br>License: <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a></div>
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FCL/sftools/dev/ide/carbidecpp