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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US">It will make our life much easier I would say.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Stas<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Liu, Yaxun (Sam)
<br>
<b>Sent:</b> Monday, May 09, 2016 1:05 PM<br>
<b>To:</b> cfe-dev (cfe-dev@lists.llvm.org) <cfe-dev@lists.llvm.org>; 'anastasia.stulova@arm.com' <anastasia.stulova@arm.com>; Pan, Xiuli <xiuli.pan@intel.com>; Bader, Alexey (alexey.bader@intel.com) <alexey.bader@intel.com><br>
<b>Cc:</b> Stellard, Thomas <Tom.Stellard@amd.com>; Sumner, Brian <Brian.Sumner@amd.com>; Mekhanoshin, Stanislav <Stanislav.Mekhanoshin@amd.com><br>
<b>Subject:</b> [OpenCL] Representing kernel attributes by LLVM target-dependent attribute-value pairs instead of metadata<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">When SPIR 1.2/2.0 spec was developed, there was no target-dependent attribute-value pair in LLVM. As such, kernel attributes were represented as metadata.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">This caused lots of inconvenience since these metadata are difficult to manipulate/change when kernel functions went through transformations in backends.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Now LLVM supports target-dependent attribute-value pair, I am wondering whether it is time to use that to represent kernel attributes.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">e.g. something like (just to give an idea, not exact llvm IR)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">kernel void foo(global int*a, sampler_t s); #1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">#1 = {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">reqd_work_group_size=”1 1 1”,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">kernel_arg_type=”int *, sampler_t”,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">basically we keep the info conveyed by the original metadata but attach them to the kernel function as attribute/value pair. This will make these attributes much easier to manipulate/change.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Any feedbacks? Thanks.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Sam<o:p></o:p></span></p>
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