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92 lines
3.9 KiB
HTML
92 lines
3.9 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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-->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>i386-LWP (Using as)</title>
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<meta name="description" content="i386-LWP (Using as)">
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<meta name="keywords" content="i386-LWP (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="i386_002dDependent.html#i386_002dDependent" rel="up" title="i386-Dependent">
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<link href="i386_002dBMI.html#i386_002dBMI" rel="next" title="i386-BMI">
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<link href="i386_002dSIMD.html#i386_002dSIMD" rel="prev" title="i386-SIMD">
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</style>
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</head>
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<body lang="en">
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<a name="i386_002dLWP"></a>
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<div class="header">
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<p>
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Next: <a href="i386_002dBMI.html#i386_002dBMI" accesskey="n" rel="next">i386-BMI</a>, Previous: <a href="i386_002dSIMD.html#i386_002dSIMD" accesskey="p" rel="prev">i386-SIMD</a>, Up: <a href="i386_002dDependent.html#i386_002dDependent" accesskey="u" rel="up">i386-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="AMD_0027s-Lightweight-Profiling-Instructions"></a>
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<h4 class="subsection">9.15.11 AMD’s Lightweight Profiling Instructions</h4>
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<a name="index-LWP_002c-i386"></a>
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<a name="index-LWP_002c-x86_002d64"></a>
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<p><code>as</code> supports AMD’s Lightweight Profiling (LWP)
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instruction set, available on AMD’s Family 15h (Orochi) processors.
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</p>
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<p>LWP enables applications to collect and manage performance data, and
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react to performance events. The collection of performance data
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requires no context switches. LWP runs in the context of a thread and
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so several counters can be used independently across multiple threads.
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LWP can be used in both 64-bit and legacy 32-bit modes.
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</p>
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<p>For detailed information on the LWP instruction set, see the
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<cite>AMD Lightweight Profiling Specification</cite> available at
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<a href="http://developer.amd.com/cpu/LWP">Lightweight Profiling Specification</a>.
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</p>
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</body>
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</html>
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