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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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| <a name="AMD_0027s-Lightweight-Profiling-Instructions"></a> |
| <h4 class="subsection">9.15.12 AMD’s Lightweight Profiling Instructions</h4> |
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| <a name="index-LWP_002c-i386"></a> |
| <a name="index-LWP_002c-x86_002d64"></a> |
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| <p><code>as</code> supports AMD’s Lightweight Profiling (LWP) |
| instruction set, available on AMD’s Family 15h (Orochi) processors. |
| </p> |
| <p>LWP enables applications to collect and manage performance data, and |
| react to performance events. The collection of performance data |
| requires no context switches. LWP runs in the context of a thread and |
| so several counters can be used independently across multiple threads. |
| LWP can be used in both 64-bit and legacy 32-bit modes. |
| </p> |
| <p>For detailed information on the LWP instruction set, see the |
| <cite>AMD Lightweight Profiling Specification</cite> available at |
| <a href="http://developer.amd.com/cpu/LWP">Lightweight Profiling Specification</a>. |
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