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67 lines
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2015 Free Software Foundation, Inc.
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<a name="i386-LWP"></a>
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<a name="i386_002dLWP"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="i386_002dBMI.html#i386_002dBMI">i386-BMI</a>,
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Previous: <a rel="previous" accesskey="p" href="i386_002dSIMD.html#i386_002dSIMD">i386-SIMD</a>,
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Up: <a rel="up" accesskey="u" href="i386_002dDependent.html#i386_002dDependent">i386-Dependent</a>
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<h4 class="subsection">9.15.11 AMD's Lightweight Profiling Instructions</h4>
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<p><a name="index-LWP_002c-i386-1141"></a><a name="index-LWP_002c-x86_002d64-1142"></a>
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<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>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>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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