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<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D;mso-fareast-language:EN-US">OK, thanks.<o:p></o:p></span></a></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D">-- Jim<br>
<br>
James Cownie <james.h.cownie@intel.com><br>
SSG/DPD/TCAR (Technical Computing, Analyzers and Runtimes)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D">Tel: +44 117 9071438</span><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:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Chandler Carruth [mailto:chandlerc@google.com]
<br>
<b>Sent:</b> Tuesday, March 15, 2016 11:28 AM<br>
<b>To:</b> Cownie, James H <james.h.cownie@intel.com>; Jason Henline <jhen@google.com>; C Bergström <cbergstrom@pathscale.com><br>
<b>Cc:</b> llvm-dev <llvm-dev@lists.llvm.org>; cfe-dev <cfe-dev@lists.llvm.org>; openmp-dev@lists.llvm.org<br>
<b>Subject:</b> Re: [cfe-dev] [Openmp-dev] RFC: Proposing an LLVM subproject for parallelism runtime and support libraries<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:10.0pt">On Tue, Mar 15, 2016 at 12:13 PM Cownie, James H <<a href="mailto:james.h.cownie@intel.com">james.h.cownie@intel.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a name="msg-f:1528866180504485379__MailEndCompos"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D">Chandler,</span></a><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D">That raises a more meta-question for me, which is “Why should StreamExecutor be in LLVM at all?”</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D">AFAICS, with you approach</span><o:p></o:p></p>
<p><span style="font-size:10.0pt;font-family:Symbol;color:#1F497D">·</span><span style="font-size:7.0pt;color:#1F497D">
</span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D">It is not a runtime library whose interface the compiler needs to understand.</span><o:p></o:p></p>
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<p class="MsoNormal">The original email pretty clearly spells out how it is specifically intended to be a target for the compiler?<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p><span style="font-size:10.0pt;font-family:Symbol;color:#1F497D">·</span><span style="font-size:7.0pt;color:#1F497D">
</span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D">It does not depend on any LLVM runtime libraries.</span><o:p></o:p></p>
<p><span style="font-size:10.0pt;font-family:Symbol;color:#1F497D">·</span><span style="font-size:7.0pt;color:#1F497D">
</span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D">It is expected to be used with out-of-tree plugins.</span><o:p></o:p></p>
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<p class="MsoNormal">Note that this doesn't mean there won't be in-tree plugins. It's analogous to how LLVM supports out-of-tree targets.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#1F497D">If I got all of that right, what connection does it have with LLVM that makes having it in the LLVM
tree necessary, or an improvement over simply having it on github (or whatever your favourite open-source hosting location is)?</span><o:p></o:p></p>
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<p class="MsoNormal">If there were nothing compiler related to it, then the argument would be much more tenuous. But I think there is a great deal of compiler relevance here.<o:p></o:p></p>
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