<div><p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">Hi All</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman""> </span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">This patch is intended to provide
support for LLVM JIT adaptive compilation on x86 platforms. The
implementation of the adaptive compilation framework is one of the Google
Summer of Code 2011 projects (<a href="http://www.google-melange.com/gsoc/project/google/gsoc2011/timexerox/8001" target="_blank"><span style="color:windowtext">http://www.google-melange.com/gsoc/project/google/gsoc2011/timexerox/8001</span></a>).
 The patch is created against the LLVM branch below. It is currently
reviewed by Eric Christoper@Apple and will be applied to the LLVM branch (<a href="https://echristo/" target="_blank"><span style="color:windowtext">https://echristo</span></a>@<a href="http://llvm.org/svn/llvm-project/llvm/branches/GSoC/adaptive-compilation" target="_blank"><span style="color:windowtext">llvm.org/svn/llvm-project/llvm/branches/GSoC/adaptive-compilation</span></a></span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">).
But more eyes are definitely welcome. Originally, the LLVM adaptive compilation framework was intended to be applied to LLVM head stream, but due to concerns regarding the upcoming major changes on ExecutionEngine and MCJIT. it is now worked in a branch and hopefully applied to the head stream once the MCJIT changes have been completed.</span></p>
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><font class="Apple-style-span" face="'Times New Roman', serif"><span class="Apple-style-span" style="font-size: 19px;"><u><br></u></span></font></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><u><span style="font-size:14.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">This patch involves changes to </span></u></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman""> </span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">include/llvm/Target/TargetJITInfo.h</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lib/Target/X86/X86JITInfo.h</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lib/Target/X86/X86JITInfo.cpp</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lib/Target/ARM/ARMJITInfo.h</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lib/Target/ARM/ARMJITInfo.cpp</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lib/Target/PowerPC/PPCJITInfo.h</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lib/Target/PowerPC/PPCJITInfo.cpp</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lib/ExecutionEngine/JIT/JITEmitter.cpp</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lib/ExecutionEngine/JIT/JIT.h</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lib/ExecutionEngine/JIT/JIT.cpp</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman""> </span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><u><span style="font-size:14.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">This was tested on x86 and x86-64
under Ubuntu with</span></u></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><font class="Apple-style-span" face="'Times New Roman', serif"><span class="Apple-style-span" style="font-size: 19px;"><u><br></u></span></font></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">llvm test-suite</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman""> </span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><u><span style="font-size:14.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">There were no regressions for the O0
- O3 JIT compilation. Additionally, adaptive compilation currently gives better
performance numbers than O1 - O3 as shown.</span></u></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman""> </span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lli -O0</span></p>

<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-font-family:
"Times New Roman"">Total Time is 1068.37</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lli -O1</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">Total Time is 1395.68</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman""> </span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lli -O2</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">Total Time is 1394.81</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman""> </span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lli -O3</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">Total Time is 1395.76</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman""> </span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">lli -adaptive-comp</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">Total Time is 1119.23</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman""> </span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman""> </span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">Thank You</span></p>

<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height:
normal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman"">Xin Tong </span></p></div>