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<p class="MsoNormal">>>>>If you are assuming these intrinsics will only be used to implement a specific set of annotations, with specific semantics, i'm probably with Reid on the "please use specific constructs" bandwagon.<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I wouldn’t disagree on this part if these intrinsics end up with usages for a specific set of annotations.
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Daniel Berlin [mailto:dberlin@dberlin.org]
<br>
<b>Sent:</b> Friday, January 13, 2017 10:01 AM<br>
<b>To:</b> Tian, Xinmin <xinmin.tian@intel.com><br>
<b>Cc:</b> Mehdi Amini <mehdi.amini@apple.com>; Hal Finkel <hfinkel@anl.gov>; llvm-dev@lists.llvm.org<br>
<b>Subject:</b> Re: [llvm-dev] [RFC] IR-level Region Annotations<o:p></o:p></span></p>
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<p class="MsoNormal">On Fri, Jan 13, 2017 at 9:00 AM, Tian, Xinmin via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Mehdi, thanks for good questions.<br>
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>>>>>Something isn’t clear to me about how do you preserve the validity of the region annotations since regular passes don’t know about the attached semantic?<br>
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There are some small changes we have to make in some optimizations to make sure the optimizations does not validation attached annotation semantics. 1) provide hand-shaking / query utils for optimization to know the region is parallel loop, 2) setup a proper
optimization phase ordering. In our product compiler ICC, we used both approaches.<o:p></o:p></p>
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<p class="MsoNormal">But this is very different than what you said earlier, becuase it's not minimal impact.<o:p></o:p></p>
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<p class="MsoNormal">Also, what you've proposed are very generic annotations, and what you are talking about here is a very specific set of ones, and their effects.<o:p></o:p></p>
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<p class="MsoNormal">If you are assuming these intrinsics will only be used to implement a specific set of annotations, with specific semantics, i'm probably with Reid on the "please use specific constructs" bandwagon.<o:p></o:p></p>
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<p class="MsoNormal">Otherwise, the regions could be and do anything, and the handshaking/querying has to be done everywhere, for everything, because you don't actually know what they are implementing.<o:p></o:p></p>
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<p class="MsoNormal">Maybe my region annotation is for "don't PRE things when they have exactly 73 predecessors" regions.<o:p></o:p></p>
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