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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Chris-<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Are you offloading the vectorizable loops or are you looking at auto-par loops also ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-Thx<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dibyendu<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> llvmdev-bounces@cs.uiuc.edu [mailto:llvmdev-bounces@cs.uiuc.edu]
<b>On Behalf Of </b>Christos Margiolas<br>
<b>Sent:</b> Friday, June 05, 2015 6:05 AM<br>
<b>To:</b> LLVM Developers Mailing List<br>
<b>Subject:</b> [LLVMdev] Supporting heterogeneous computing in llvm.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Hello All,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.5pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">The last two months I have been working on the design and implementation of a heterogeneous execution engine for LLVM. I started this project as an intern at the Qualcomm Innovation Center and I believe it
can be useful to different people and use cases. I am planning to share more details and a set of patches in the next <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">days. However, I would first like to see if there is an interest for this. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">The project is about providing compiler and runtime support for the automatic and transparent offloading of loop or function workloads to accelerators. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">It is composed of the following:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">a) Compiler and Transformation Passes for extracting loops or functions for offloading.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">b) A runtime library that handles scheduling, data sharing and coherency between the<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">host and accelerator sides.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">c) A modular codebase and design. Adaptors specialize the code transformations for the target accelerators. Runtime plugins manage the interaction with the different accelerator environments.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">So far, this work so far supports the Qualcomm DSP accelerator but I am planning to extend it to support OpenCL accelerators. I have also developed a debug port where I can test the passes and the runtime
without requiring an accelerator.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">The project is still in early R&D stage and I am looking forward for feedback and to gauge the interest level. I am willing to continue working on this as an open source project and bring it to the right shape
so it can be merged with the LLVM tree. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">Chris<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.5pt">P.S. I intent to join the llvm social in Bay Area tonight and I will be more than happy to talk about it.<o:p></o:p></span></p>
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