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<p class="MsoNormal"><a name="_MailEndCompose"><span lang="EN-US" style="color:#993366;mso-fareast-language:EN-US">In addition to that we will have to modify diagnostics message a bit:<o:p></o:p></span></a></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="color:#993366;mso-fareast-language:EN-US"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:#993366;mso-fareast-language:EN-US">for OpenCL before v1.2 we should require cl_khr_fp64 (as it’s done right now)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="color:#993366;mso-fareast-language:EN-US"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="color:#993366;mso-fareast-language:EN-US">for OpenCL v1.2+ let user know that doubles are not supported by the platform if it’s not enabled by compiler option.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#993366;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#993366;mso-fareast-language:EN-US">Does it make sense?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#993366;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="color:#993366">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#993366">Alexey<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><a name="_____replyseparator"></a><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Liu, Yaxun (Sam) [mailto:Yaxun.Liu@amd.com]
<br>
<b>Sent:</b> Wednesday, April 20, 2016 6:03 PM<br>
<b>To:</b> Bader, Alexey; cfe-dev (cfe-dev@lists.llvm.org)<br>
<b>Cc:</b> 'anastasia.stulova@arm.com'; Sumner, Brian; Pan, Xiuli<br>
<b>Subject:</b> RE: [OpenCL] atomic_double requires cl_khr_fp64 enabled<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" style="color:#1F497D">Then we can let Clang define macro cl_khr_fp64 when cl-fp64-enable is on. Then the header file will use #ifdef cl_khr_fp64 to enable double type builtin functions.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Sam<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><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> Wednesday, April 20, 2016 11:00 AM<br>
<b>To:</b> 'Bader, Alexey' <<a href="mailto:alexey.bader@intel.com">alexey.bader@intel.com</a>>; cfe-dev (<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>) <<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>><br>
<b>Cc:</b> 'anastasia.stulova@arm.com' <<a href="mailto:anastasia.stulova@arm.com">anastasia.stulova@arm.com</a>>; Sumner, Brian <<a href="mailto:Brian.Sumner@amd.com">Brian.Sumner@amd.com</a>>; Pan, Xiuli <<a href="mailto:xiuli.pan@intel.com">xiuli.pan@intel.com</a>><br>
<b>Subject:</b> RE: [OpenCL] atomic_double requires cl_khr_fp64 enabled<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">We can use that.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Currently double is automatically enabled in Clang for –cl-std=CL2.0. We could enable double only under cl-fp64-enable.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Sam<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><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"> Bader, Alexey [<a href="mailto:alexey.bader@intel.com">mailto:alexey.bader@intel.com</a>]
<br>
<b>Sent:</b> Wednesday, April 20, 2016 10:56 AM<br>
<b>To:</b> Liu, Yaxun (Sam) <<a href="mailto:Yaxun.Liu@amd.com">Yaxun.Liu@amd.com</a>>; cfe-dev (<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>) <<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>><br>
<b>Cc:</b> 'anastasia.stulova@arm.com' <<a href="mailto:anastasia.stulova@arm.com">anastasia.stulova@arm.com</a>>; Sumner, Brian <<a href="mailto:Brian.Sumner@amd.com">Brian.Sumner@amd.com</a>>; Pan, Xiuli <<a href="mailto:xiuli.pan@intel.com">xiuli.pan@intel.com</a>><br>
<b>Subject:</b> RE: [OpenCL] atomic_double requires cl_khr_fp64 enabled<o:p></o:p></span></p>
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</div>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">One correction: doubles became optional core feature in OpenCL 1.2.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">I’m agree that it’s a bug, but I’d like to discuss the ideas on how to fix it.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">There should be some way to let clang know that doubles are not supported by OpenCL platform and it’s expected to get diagnostics in this case.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">OpenCL C++ compiler introduces compiler knob for that. “cl-fp64-enable”<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><a href="https://github.com/KhronosGroup/SPIR/blob/spirv-1.1/include/clang/Driver/CC1Options.td#L606">https://github.com/KhronosGroup/SPIR/blob/spirv-1.1/include/clang/Driver/CC1Options.td#L606</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Alexey<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="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) [<a href="mailto:Yaxun.Liu@amd.com">mailto:Yaxun.Liu@amd.com</a>]
<br>
<b>Sent:</b> Wednesday, April 20, 2016 5:45 PM<br>
<b>To:</b> cfe-dev (<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>)<br>
<b>Cc:</b> 'anastasia.stulova@arm.com'; Sumner, Brian; Pan, Xiuli; Bader, Alexey<br>
<b>Subject:</b> [OpenCL] atomic_double requires cl_khr_fp64 enabled<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Currently Clang requires cl_khr_fp64 enabled to use atomic_double. This seems to be a bug.<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">In OpenCL 2.0 fp64 is an optional feature. If platform supports it, there is no need to enable cl_khr_fp64 to use it. Actually in OpenCL 2.0 spec cl_khr_fp64 is not defined.<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">I plan to fix that if all agree it is a bug.<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">What’s your opinion? 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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