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<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"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></a></p>

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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"> mehdi.amini@apple.com [mailto:mehdi.amini@apple.com]

<br>

<b>Sent:</b> Tuesday, January 31, 2017 9:03 PM<br>

<b>To:</b> Tian, Xinmin <xinmin.tian@intel.com><br>

<b>Cc:</b> Sanjoy Das <sanjoy@playingwithpointers.com>; Adve, Vikram Sadanand <vadve@illinois.edu>; llvm-dev@lists.llvm.org; llvm-dev-request@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"><o:p> </o:p></p>

<p class="MsoNormal"><o:p> </o:p></p>

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<p class="MsoNormal">On Jan 31, 2017, at 7:53 PM, Tian, Xinmin <<a href="mailto:xinmin.tian@intel.com">xinmin.tian@intel.com</a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal"><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">In this case, inliner is educated to add all local variables to the tag of enclosing parallel region, if there is enclosing parallel region.  </span><o:p></o:p></p>

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<p class="MsoNormal"><o:p> </o:p></p>

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<p class="MsoNormal"><o:p> </o:p></p>

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<p class="MsoNormal"><span style="color:#1F497D">S</span>o isn’t it a good example that shows that your intrinsic *cannot* be opaque and that IR passes need to be modified to handle not only the IR-region intrinsic but also the specific semantic of the tag?<span style="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">[XT] I thought we said a number of times, there are small changes to be made. I quoted a ball park #  2000 LOC vs. 6000 LOC w.r.t changes, in one of early emails.

<o:p></o:p></span></p>

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<p class="MsoNormal">It seems to me that this contradicts the claim that the “tag” specific semantic does not need to be handled by the optimizer and that the intrinsic can integrate seamlessly in LLVM, which invalidates the approach (of a generic intrinsic)

 entirely IMO.<o:p></o:p></p>

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<p class="MsoNormal"><o:p> </o:p></p>

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<p class="MsoNormal">Maybe you never intended to claim this, but this is a hidden cost in the original RFC, and I suspect this cost has to be carefully evaluated. At this point I’m not sure it is worth discussing anything further without seeing a proper LangRef

 update.<o:p></o:p></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">[XT] All we said is to minimize cost when it is possible. The intrinsic functions is a generic for representing a directive and region, such as prefecth, unroll,

 omp, ….  Each instance of them will have their semantics which will be in following up RFCs

<o:p></o:p></span></p>

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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">In our icc implementation, it is even simple, as we have routine level symbol table, the inliner adds  ”private”  attribute to those local variables w/o checking

 enclosing scope, the parallelizer does check and use it.<span class="apple-converted-space"> </span></span><o:p></o:p></p>

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<p class="MsoNormal"><o:p> </o:p></p>

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<p class="MsoNormal">Again, you’re trying to address a specific case, while I’m just trying to identify a generic class of problem that your proposal fails to address explicitly.<o:p></o:p></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">[XT] It looks there is a mis-understanding of proposal. The proposal is to build up experimental framework with proposed interface to evaluate set of changes

 (or cost) needed for usage cases we know of. Hal and I carefully positioned this RFC. Even all intrinsics are named as experimental.  So far,  cost for handling these cases identified is within a range of our expectation.   <o:p></o:p></span></p>

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<p class="MsoNormal"><o:p> </o:p></p>

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<p class="MsoNormal">Best,<o:p></o:p></p>

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<p class="MsoNormal"><o:p> </o:p></p>

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<p class="MsoNormal">— <o:p></o:p></p>

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<p class="MsoNormal">Mehdi<o:p></o:p></p>

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<p class="MsoNormal"><o:p> </o:p></p>

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<p class="MsoNormal"><o:p> </o:p></p>

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<p class="MsoNormal"><o:p> </o:p></p>

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<p class="MsoNormal"><o:p> </o:p></p>

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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span class="apple-converted-space"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a href="mailto:mehdi.amini@apple.com">mehdi.amini@apple.com</a>

 [<a href="mailto:mehdi.amini@apple.com">mailto:mehdi.amini@apple.com</a>]<span class="apple-converted-space"> </span><br>

<b>Sent:</b><span class="apple-converted-space"> </span>Tuesday, January 31, 2017 7:31 PM<br>

<b>To:</b><span class="apple-converted-space"> </span>Tian, Xinmin <<a href="mailto:xinmin.tian@intel.com">xinmin.tian@intel.com</a>><br>

<b>Cc:</b><span class="apple-converted-space"> </span>Sanjoy Das <<a href="mailto:sanjoy@playingwithpointers.com">sanjoy@playingwithpointers.com</a>>; Adve, Vikram Sadanand <<a href="mailto:vadve@illinois.edu">vadve@illinois.edu</a>>;

<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>; <a href="mailto:llvm-dev-request@lists.llvm.org">

llvm-dev-request@lists.llvm.org</a><br>

<b>Subject:</b><span class="apple-converted-space"> </span>Re: [llvm-dev] [RFC] IR-level Region Annotations</span><o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"><br>

Sent from my iPhone<o:p></o:p></p>

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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>

On Jan 31, 2017, at 7:27 PM, Tian, Xinmin <<a href="mailto:xinmin.tian@intel.com"><span style="color:purple">xinmin.tian@intel.com</span></a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal">Remember that,  the prepare-phase is invoked in the FE or right after FE, inlining is not happening, that is why we don't call it "pass".  Chandler made a good point for this case a long time back.  <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">What I was describing is the inlining in the optimizer pipeline.<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">Hoisting alloca is totally ok.  A new alloca is generated during outlining later on for anything marked as "private" (so long the "private" information is saves in the tag). I thought we talked this in an early email.  <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">Can you describe how (and at which point) you get the private for "var"  added to the tag?<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">-- <o:p></o:p></p>

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<p class="MsoNormal">Mehdi<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"><br>

By the way, all concerns you have are all valid, we had worked on resolving these issues 10+ years back when we did similar things in our compilers. I wouldn't claim we have perfect solutions, but we do reasonable good solutions for handling general directives

 and openmp directives.    <o:p></o:p></p>

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<p class="MsoNormal">Xinmin<br>

<br>

-----Original Message-----<br>

From:<span class="apple-converted-space"> </span><a href="mailto:mehdi.amini@apple.com"><span style="color:purple">mehdi.amini@apple.com</span></a><span class="apple-converted-space"> </span>[<a href="mailto:mehdi.amini@apple.com"><span style="color:purple">mailto:mehdi.amini@apple.com</span></a>]<span class="apple-converted-space"> </span><br>

Sent: Tuesday, January 31, 2017 7:08 PM<br>

To: Tian, Xinmin <<a href="mailto:xinmin.tian@intel.com"><span style="color:purple">xinmin.tian@intel.com</span></a>><br>

Cc: Sanjoy Das <<a href="mailto:sanjoy@playingwithpointers.com"><span style="color:purple">sanjoy@playingwithpointers.com</span></a>>; Adve, Vikram Sadanand <<a href="mailto:vadve@illinois.edu"><span style="color:purple">vadve@illinois.edu</span></a>>;<span class="apple-converted-space"> </span><a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a>;<span class="apple-converted-space"> </span><a href="mailto:llvm-dev-request@lists.llvm.org"><span style="color:purple">llvm-dev-request@lists.llvm.org</span></a><br>

Subject: Re: [llvm-dev] [RFC] IR-level Region Annotations<br>

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<br>

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<br>

<o:p></o:p></p>

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<p class="MsoNormal">On Jan 31, 2017, at 6:48 PM, Tian, Xinmin <<a href="mailto:xinmin.tian@intel.com"><span style="color:purple">xinmin.tian@intel.com</span></a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal">Let me try this.<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">You can simply consider the prepare-phase (e.g. pre-privatization)  were done in FE  (actually a library can be used by multiple FEs at LLVM IR level),  the region is run with 1 thread,  region annotation (scope, single-entry-single-exit)

 as memory barrier conservatively for now (instead of checking individual memory dependency, aliasing via tags which is the actual implementation is done) marked with region intrinsic functions. What optimization will mess up  with this region-annotation?  <o:p></o:p></p>

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<p class="MsoNormal"><br>

The first thing that comes to my mind is inlining that can put the IR in a form that breaks the invariant you tried to enforce with your "prepare-phase” (for example by hoisting an allocas).<br>

<br>

—<span class="apple-converted-space"> </span><br>

Mehdi<br>

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<o:p></o:p></p>

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<p class="MsoNormal">-----Original Message-----<o:p></o:p></p>

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<p class="MsoNormal">From:<span class="apple-converted-space"> </span><a href="mailto:mehdi.amini@apple.com"><span style="color:purple">mehdi.amini@apple.com</span></a><span class="apple-converted-space"> </span>[<a href="mailto:mehdi.amini@apple.com"><span style="color:purple">mailto:mehdi.amini@apple.com</span></a>]<o:p></o:p></p>

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<p class="MsoNormal">Sent: Tuesday, January 31, 2017 5:47 PM<o:p></o:p></p>

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<p class="MsoNormal">To: Tian, Xinmin <<a href="mailto:xinmin.tian@intel.com"><span style="color:purple">xinmin.tian@intel.com</span></a>><o:p></o:p></p>

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<p class="MsoNormal">Cc: Sanjoy Das <<a href="mailto:sanjoy@playingwithpointers.com"><span style="color:purple">sanjoy@playingwithpointers.com</span></a>>; Adve, Vikram Sadanand <<a href="mailto:vadve@illinois.edu"><span style="color:purple">vadve@illinois.edu</span></a>>;<span class="apple-converted-space"> </span><a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a>;<span class="apple-converted-space"> </span><a href="mailto:llvm-dev-request@lists.llvm.org"><span style="color:purple">llvm-dev-request@lists.llvm.org</span></a><o:p></o:p></p>

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<p class="MsoNormal">Subject: Re: [llvm-dev] [RFC] IR-level Region Annotations<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">On Jan 31, 2017, at 5:38 PM, Tian, Xinmin <<a href="mailto:xinmin.tian@intel.com"><span style="color:purple">xinmin.tian@intel.com</span></a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">Ok, but this looks like a “workaround" for your specific use-case, I don’t see how it can scale as a model-agnostic and general-purpose region semantic.<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">I would say it is a design trade-off.<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">I’m not sure if we’re talking about the same thing here: my understanding at this point is that the design trading-off you’re making “simplicity” by scarifying “correctness”.<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">Requiring the IR to stay in what you’re calling a “canonical” form in your answer to Sanjoy in order to not miscompile a program is not an approach that seems compatible with how we deal with the IR usually.<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">Regardless it is a new instruction or an intrinsics with token/tag, it will consist of  model-agnostic part and model-non-agnostic part. The package comes with a framework for parsing and using these intrinsics.  See the reply I had for

 Sanjoy's email.<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">The answer to Sanjoy is not really helpful to clarify anything to me. At this point I still don’t understand how this is supposed to be correct in general.<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">It would be helpful to have a LangRef patch that describes the semantic associated to your region intrinsics. Then we may be able to process some examples through the formalized description.<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">—<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">Mehdi<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">-----Original Message-----<o:p></o:p></p>

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<p class="MsoNormal">From:<span class="apple-converted-space"> </span><a href="mailto:mehdi.amini@apple.com"><span style="color:purple">mehdi.amini@apple.com</span></a><span class="apple-converted-space"> </span>[<a href="mailto:mehdi.amini@apple.com"><span style="color:purple">mailto:mehdi.amini@apple.com</span></a>]<o:p></o:p></p>

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<p class="MsoNormal">Sent: Saturday, January 21, 2017 1:57 PM<o:p></o:p></p>

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<p class="MsoNormal">To: Tian, Xinmin <<a href="mailto:xinmin.tian@intel.com"><span style="color:purple">xinmin.tian@intel.com</span></a>><o:p></o:p></p>

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<p class="MsoNormal">Cc: Sanjoy Das <<a href="mailto:sanjoy@playingwithpointers.com"><span style="color:purple">sanjoy@playingwithpointers.com</span></a>>; Adve, Vikram Sadanand <<a href="mailto:vadve@illinois.edu"><span style="color:purple">vadve@illinois.edu</span></a>>;<span class="apple-converted-space"> </span><a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a>;<span class="apple-converted-space"> </span><a href="mailto:llvm-dev-request@lists.llvm.org"><span style="color:purple">llvm-dev-request@lists.llvm.org</span></a><o:p></o:p></p>

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<div>

<p class="MsoNormal">Subject: Re: [llvm-dev] [RFC] IR-level Region Annotations<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">On Jan 20, 2017, at 11:17 AM, Tian, Xinmin <<a href="mailto:xinmin.tian@intel.com"><span style="color:purple">xinmin.tian@intel.com</span></a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">This means that the optimizer has to be aware of it, I’m missing the magic here?<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">This is one option.  <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">The another option is that, as I mentioned in our LLVM-HPC paper in our implementation. We have a "prepare phase for pre-privatization" can be invoked by both Clang FE and Fortran FE right after LLVM IR is generated. So, in this way, we

 are able to minimize the optimizations impact for the original val and I<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">Ok, but this looks like a “workaround" for your specific use-case, I don’t see how it can scale as a model-agnostic and general-purpose region semantic.<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">The fact that you needed this pre-step in the first place seems to indicate to me that it confirms what multiple people expressed in this thread, for example what Daniel wrote here:<span class="apple-converted-space"> </span><a href="http://lists.llvm.org/pipermail/llvm-dev/2017-January/108997.html"><span style="color:purple">http://lists.llvm.org/pipermail/llvm-dev/2017-January/108997.html</span></a><o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">—<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">Mehdi<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">{ void main() {<o:p></o:p></p>

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<p class="MsoNormal">i32* val = alloca i32<o:p></o:p></p>

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<p class="MsoNormal">i32* I = alloca 32<o:p></o:p></p>

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<p class="MsoNormal">i32* priv_val = alloca i32<o:p></o:p></p>

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<p class="MsoNormal">i32* priv_i alloca 32<o:p></o:p></p>

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<p class="MsoNormal">tok = llvm.experimental.intrinsic_a()[ "DIR.PARALLEL"(),"QUAL.PRIVATE"(i32* %priv_val, i32 %priv_i), "QUAL.NUM_THREADS"(i32 4)]<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">%priv_i = omp_get_thread_num();<o:p></o:p></p>

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<p class="MsoNormal">compute_something_into_val(%priv_val, %priv_i);  <o:p></o:p></p>

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<p class="MsoNormal">a[priv_i] = %priv_val;<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">llvm.experimental.intrinsic_b(tok)["DIR.END.PARALLEL"()];<o:p></o:p></p>

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<p class="MsoNormal">....<o:p></o:p></p>

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<p class="MsoNormal">I =<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">Val =<o:p></o:p></p>

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<p class="MsoNormal">Foo(val, i).<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">}<o:p></o:p></p>

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<p class="MsoNormal">"Prepare phase" is our way of minimizing the impact to existing optimizations.<o:p></o:p></p>

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<p class="MsoNormal">Xinmin<o:p></o:p></p>

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<p class="MsoNormal">-----Original Message-----<o:p></o:p></p>

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<p class="MsoNormal">From:<span class="apple-converted-space"> </span><a href="mailto:mehdi.amini@apple.com"><span style="color:purple">mehdi.amini@apple.com</span></a><span class="apple-converted-space"> </span>[<a href="mailto:mehdi.amini@apple.com"><span style="color:purple">mailto:mehdi.amini@apple.com</span></a>]<o:p></o:p></p>

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<p class="MsoNormal">Sent: Friday, January 20, 2017 10:54 AM<o:p></o:p></p>

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<p class="MsoNormal">To: Tian, Xinmin<o:p></o:p></p>

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<p class="MsoNormal">Cc: Sanjoy Das; Adve, Vikram Sadanand;<span class="apple-converted-space"> </span><a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a>;<span class="apple-converted-space"> </span><a href="mailto:llvm-dev-request@lists.llvm.org"><span style="color:purple">llvm-dev-request@lists.llvm.org</span></a><o:p></o:p></p>

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<p class="MsoNormal">Subject: Re: [llvm-dev] [RFC] IR-level Region Annotations<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">On Jan 20, 2017, at 10:44 AM, Tian, Xinmin via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">Sanjoy, the IR would be like something below. It is ok to hoist alloca instruction outside the region. There are some small changes in optimizer to understand region-annotation intrinsic.   <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">{ void main() {<o:p></o:p></p>

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<p class="MsoNormal">i32* val = alloca i32<o:p></o:p></p>

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<p class="MsoNormal">tok = llvm.experimental.intrinsic_a()[ "DIR.PARALLEL"(),<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">"QUAL.PRIVATE"(i32* val), "QUAL.NUM_THREADS"(i32 4)]<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">int i = omp_get_thread_num();<o:p></o:p></p>

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<p class="MsoNormal">compute_something_into_val(val, i);<o:p></o:p></p>

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<p class="MsoNormal">a[i] = val;<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">llvm.experimental.intrinsic_b(tok)["DIR.END.PARALLEL"()];<o:p></o:p></p>

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<p class="MsoNormal">}<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">With above representation, we can do privatization and outlining as<o:p></o:p></p>

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<p class="MsoNormal">below<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">{ void main() {<o:p></o:p></p>

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<p class="MsoNormal">i32* val = alloca i32<o:p></o:p></p>

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<p class="MsoNormal">i32* I = alloca 32<o:p></o:p></p>

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<p class="MsoNormal">tok = llvm.experimental.intrinsic_a()[ "DIR.PARALLEL"(),<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">"QUAL.PRIVATE"(i32* %val, i32 %i), "QUAL.NUM_THREADS"(i32 4)]<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">%ii = omp_get_thread_num();<o:p></o:p></p>

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<p class="MsoNormal">compute_something_into_val(%val, %i);  a[i] = %val;<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">llvm.experimental.intrinsic_b(tok)["DIR.END.PARALLEL"()];<o:p></o:p></p>

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<p class="MsoNormal">}<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">Here we come to the interesting part: the hoisting of  "i32* I = alloca 32” above the intrinsics required to update the intrinsics information “QUAL.PRIVATE”.<o:p></o:p></p>

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<p class="MsoNormal">This means that the optimizer has to be aware of it, I’m missing the magic here?<o:p></o:p></p>

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<p class="MsoNormal">I understand that an openmp specific optimization can do it, the question is how it an openmp agnostic supposed to behave in face of llvm.experimental.intrinsic_a?<o:p></o:p></p>

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<p class="MsoNormal">—<o:p></o:p></p>

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<p class="MsoNormal">Mehdi<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">1. create i32* priv_val = alloca i32  %priv_i = ...in the region, and replace all  %val with %prv_val in the region.<o:p></o:p></p>

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<p class="MsoNormal">2. perform outlining.<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">Caller code<o:p></o:p></p>

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<p class="MsoNormal">....<o:p></o:p></p>

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<p class="MsoNormal">omp_push_num_threads(4)<o:p></o:p></p>

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<p class="MsoNormal">omp_fork_call( .... outline_par_region....) ....<o:p></o:p></p>

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<p class="MsoNormal">Callee code:<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">Outlined_par_rgion {<o:p></o:p></p>

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<p class="MsoNormal">I32* priv_val = alloca 32<o:p></o:p></p>

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<p class="MsoNormal">I32* priv_i = ....<o:p></o:p></p>

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<p class="MsoNormal">Ret<o:p></o:p></p>

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<p class="MsoNormal">}<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">For OpenMP, we do support it at -O0, -O1, -O2 and -O3.  We had to make sure it runs correctly w/ and w/o optimizations and advanced analysis. So we need to preserve all source information for BE.  <o:p></o:p></p>

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<p class="MsoNormal">You can take a look our LLVM-HPC paper for a bit some details.  There are still tons of work to be done. Thanks.<o:p></o:p></p>

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<p class="MsoNormal">Xinmin<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">-----Original Message-----<o:p></o:p></p>

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<p class="MsoNormal">From: llvm-dev [<a href="mailto:llvm-dev-bounces@lists.llvm.org"><span style="color:purple">mailto:llvm-dev-bounces@lists.llvm.org</span></a>] On Behalf Of Sanjoy Das via llvm-dev<o:p></o:p></p>

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<p class="MsoNormal">Sent: Thursday, January 19, 2017 10:13 PM<o:p></o:p></p>

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<p class="MsoNormal">To: Adve, Vikram Sadanand <<a href="mailto:vadve@illinois.edu"><span style="color:purple">vadve@illinois.edu</span></a>><o:p></o:p></p>

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<p class="MsoNormal">Cc: llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a>>;<span class="apple-converted-space"> </span><a href="mailto:llvm-dev-request@lists.llvm.org"><span style="color:purple">llvm-dev-request@lists.llvm.org</span></a><o:p></o:p></p>

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<p class="MsoNormal">Subject: Re: [llvm-dev] [RFC] IR-level Region Annotations<o:p></o:p></p>

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<p class="MsoNormal">Hi Vikram,<o:p></o:p></p>

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<p class="MsoNormal">On Thu, Jan 19, 2017 at 9:27 PM, Adve, Vikram Sadanand <<a href="mailto:vadve@illinois.edu"><span style="color:purple">vadve@illinois.edu</span></a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal">Hi Sanjoy,<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">Yes, that's exactly what we have been looking at recently here, but<o:p></o:p></p>

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<p class="MsoNormal">the region tags seem to make it possible to express the control flow<o:p></o:p></p>

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<p class="MsoNormal">as well, so I think we could start with reg ions+metadata, as Hal and<o:p></o:p></p>

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">I'm not yet convinced that region tags are sufficient to model exotic control flow.<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">(I don't know OpenMP so this is a copy-pasted-edited example)<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">Say we have:<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">void main() {<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">#pragma omp parallel num_threads(4)<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">{<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">int i = omp_get_thread_num();<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">int val;<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">compute_something_into_val(&val, i);<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">a[i] = val;<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">}<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">}<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">I presume the (eventual) intended lowering is something like this (if the intended lowering is different than this, and avoids the issue I'm trying to highlight then my point is moot):<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">void main() {<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">tok = llvm.experimental.intrinsic_a();<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">int i = omp_get_thread_num();<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">i32* val = alloca i32<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">compute_something_into_val(val, i);<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">a[i] = val;<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">llvm.experimental.intrinsic_b(tok);<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">}<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">However, LLVM is free to hoist the alloca to the entry block:<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">void main() {<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">i32* val = alloca i32<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">tok = llvm.experimental.intrinsic_a();<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">int i = omp_get_thread_num();<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">compute_something_into_val(val, i);<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">a[i] = val;<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">llvm.experimental.intrinsic_b(tok);<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">}<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">and now you have a race between the four parallel forks.<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">The problem here is that nothing in the IR expresses that we have four copies of the region running "at the same time".  In fact, such a control flow is alien to LLVM today.<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">For instance, another evil optimization may turn:<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">void main() {<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">int a[4];<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">#pragma omp parallel num_threads(4)<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">{<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">int i = omp_get_thread_num();<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">int val = compute_something_into_val(i);<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">a[i] = val;<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">}<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">return a[0] + a[1];<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">}<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">to<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">void main() {<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<div>

<p class="MsoNormal">int a[4];<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">#pragma omp parallel num_threads(4)<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">{<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">int i = omp_get_thread_num();<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">int val = compute_something_into_val(i);<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">a[i] = val;<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<div>

<p class="MsoNormal">}<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<div>

<p class="MsoNormal">return undef;<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">}<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">since a[i] = val could have initialized at most one element in a.<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">Now you could say that the llvm.experimental.intrinsic_a and llvm.experimental.intrinsic_b intrinsics are magic, and even such "obvious" optimizations are not allowed to happen across them; but then calls to these intrinsics is pretty fundamentally

 different from "normal" calls, and are probably best modeled as new instructions.<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<div>

<p class="MsoNormal">You're going to have to do the same kind of auditing of passes either way, and the only extra cost of a new instruction is the extra bitcode reading / writing code.<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<div>

<p class="MsoNormal">I hope I made sense.<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">-- Sanjoy<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">Xinmin proposed, and then figure out what needs to be first class<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">instructions.<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal">--Vikram Adve<o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<div>

<p class="MsoNormal">On Jan 19, 2017, at 11:03 PM, Sanjoy Das <<a href="mailto:sanjoy@playingwithpointers.com"><span style="color:purple">sanjoy@playingwithpointers.com</span></a>> wrote:<o:p></o:p></p>

</div>

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

<div>

<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">Hi,<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">My bias is to use both (b) and (d), since they have complementary<o:p></o:p></p>

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<p class="MsoNormal">strengths.  We should use (b) for expressing concepts that can't be<o:p></o:p></p>

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<p class="MsoNormal">semantically modeled as a call or invoke (this branch takes both its<o:p></o:p></p>

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<p class="MsoNormal">successors), and (d) for expressing things that can be (this call may<o:p></o:p></p>

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<p class="MsoNormal">never return), and annotation like things (this region (denoted by<o:p></o:p></p>

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<p class="MsoNormal">def-use of a token) is a reduction).<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">I don't grok OpenMP, but perhaps we can come with one or two<o:p></o:p></p>

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<p class="MsoNormal">"generalized control flow"-type instructions that can be used to<o:p></o:p></p>

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<p class="MsoNormal">model the non-call/invoke like semantics we'd like LLVM to know<o:p></o:p></p>

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<p class="MsoNormal">about, and model the rest with (d)?<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">-- Sanjoy<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">On Thu, Jan 19, 2017 at 8:28 PM, Hal Finkel via llvm-dev<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal"><<a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">On 01/19/2017 03:36 PM, Mehdi Amini via llvm-dev wrote:<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">On Jan 19, 2017, at 1:32 PM, Daniel Berlin <<a href="mailto:dberlin@dberlin.org"><span style="color:purple">dberlin@dberlin.org</span></a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal">On Thu, Jan 19, 2017 at 1:12 PM, Mehdi Amini <<a href="mailto:mehdi.amini@apple.com"><span style="color:purple">mehdi.amini@apple.com</span></a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal">On Jan 19, 2017, at 12:04 PM, Daniel Berlin <<a href="mailto:dberlin@dberlin.org"><span style="color:purple">dberlin@dberlin.org</span></a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal">On Thu, Jan 19, 2017 at 11:46 AM, Mehdi Amini via llvm-dev<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal"><<a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal">On Jan 19, 2017, at 11:36 AM, Adve, Vikram Sadanand via llvm-dev<o:p></o:p></p>

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<p class="MsoNormal"><<a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a>> wrote:<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">Hi Johannes,<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">I am especially curious where you get your data from. Tapir [0]<o:p></o:p></p>

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<p class="MsoNormal">(and to some degree PIR [1]) have shown that,<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">counterintuitively, only a few changes to LLVM passes are<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">needed. Tapir was recently used in an MIT class with a lot of<o:p></o:p></p>

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<p class="MsoNormal">students and it seemed to work well with only minimal changes to<o:p></o:p></p>

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<p class="MsoNormal">analysis and especially transformation passes.<o:p></o:p></p>

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<p class="MsoNormal">TAPIR is an elegant, small extension and, in particular, I think<o:p></o:p></p>

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<p class="MsoNormal">the idea of asymmetric parallel tasks and control flow is a<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">clever way to express parallelism with serial semantics, as in<o:p></o:p></p>

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<p class="MsoNormal">Cilk.  Encoding the control flow extensions as explicit<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">instructions is orthogonal to that, though arguably more elegant than using region tags + metadata.<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">However, Cilk is a tiny language compared with the full<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">complexity of other languages, like OpenMP.  To take just one<o:p></o:p></p>

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<p class="MsoNormal">example, TAPIR cannot express the ORDERED construct of OpenMP.  A<o:p></o:p></p>

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<p class="MsoNormal">more serious concern, IMO, is that TAPIR (like Cilk) requires<o:p></o:p></p>

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<p class="MsoNormal">serial semantics, whereas there are many parallel languages, OpenMP included, that do not obey that restriction.<o:p></o:p></p>

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<p class="MsoNormal">Third, OpenMP has *numerous* clauses, e.g., REDUCTION or PRIVATE,<o:p></o:p></p>

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<p class="MsoNormal">that are needed because without that, you’d be dependent on<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">fundamentally hard compiler analyses to extract the same<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">information for satisfactory parallel performance; realistic<o:p></o:p></p>

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<p class="MsoNormal">applications cannot depend on the success of such analyses.<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">I agree with this, but I’m also wondering if it needs to be first<o:p></o:p></p>

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<p class="MsoNormal">class in the IR?<o:p></o:p></p>

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<p class="MsoNormal">For example we know our alias analysis is very basic, and C/C++<o:p></o:p></p>

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<p class="MsoNormal">have a higher constraint thanks to their type system, but we<o:p></o:p></p>

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<p class="MsoNormal">didn’t inject this higher level information that helps the<span class="apple-converted-space"> </span><o:p></o:p></p>

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<p class="MsoNormal">optimizer as first class IR constructs.<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">FWIW, while i agree with the general point, i wouldn't use this example.<o:p></o:p></p>

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<p class="MsoNormal">Because we pretty much still suffer to this day because of it (both<o:p></o:p></p>

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<div>

<p class="MsoNormal">in AA, and devirt, and ...)  :) We can't always even tell fields<o:p></o:p></p>

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<p class="MsoNormal">apart<o:p></o:p></p>

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

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<div>

<p class="MsoNormal">Is it inherent to the infrastructure, i.e. using metadata instead<o:p></o:p></p>

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<div>

<p class="MsoNormal">of first class IR construct or is it just a “quality of implementation” issue?<o:p></o:p></p>

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

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<div>

<p class="MsoNormal">Not to derail this conversation:<o:p></o:p></p>

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

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<div>

<p class="MsoNormal">IMHO, At some point there is no real difference :)<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<div>

<p class="MsoNormal">Because otherwise, everything is a QOI issue.<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<div>

<p class="MsoNormal">IE if it's super tricky to get metadata that works well and works<o:p></o:p></p>

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<div>

<p class="MsoNormal">right, doesn't get lost, etc, and that's inherent to using metadata,<o:p></o:p></p>

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</blockquote>

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<p class="MsoNormal">that to me is not a QOI issue.<o:p></o:p></p>

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

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<div>

<p class="MsoNormal">So could it be done with metadata? Probably?<o:p></o:p></p>

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</blockquote>

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<div>

<p class="MsoNormal">But at the same time,  if it had been done with more first class<o:p></o:p></p>

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</blockquote>

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<div>

<p class="MsoNormal">constructs, it would have happened years ago  and been much lower cost.<o:p></o:p></p>

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</blockquote>

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

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<div>

<p class="MsoNormal">This is what I meant by “inherent to the infrastructure”, thanks for<o:p></o:p></p>

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<div>

<p class="MsoNormal">clarifying.<o:p></o:p></p>

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

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</blockquote>

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</blockquote>

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<div>

<p class="MsoNormal"> <o:p></o:p></p>

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</blockquote>

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</blockquote>

<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">

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<div>

<p class="MsoNormal">To clarify, we were proposing metadata that is used as arguments to<o:p></o:p></p>

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<div>

<p class="MsoNormal">the region-annotation intrinsics. This metadata has the nice<o:p></o:p></p>

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<div>

<p class="MsoNormal">property that it does not get dropped (so it is just being used as a<o:p></o:p></p>

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<p class="MsoNormal">way of encoding whatever data structures are necessary without predefining a syntactic schema).<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">-Hal<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">—<o:p></o:p></p>

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<p class="MsoNormal">Mehdi<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">_______________________________________________<o:p></o:p></p>

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<p class="MsoNormal">LLVM Developers mailing list<o:p></o:p></p>

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<p class="MsoNormal"><a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a><o:p></o:p></p>

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<p class="MsoNormal"><a href="http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev"><span style="color:purple">http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</span></a><o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">--<o:p></o:p></p>

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<p class="MsoNormal">Hal Finkel<o:p></o:p></p>

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<p class="MsoNormal">Lead, Compiler Technology and Programming Languages Leadership<o:p></o:p></p>

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<p class="MsoNormal">Computing Facility Argonne National Laboratory<o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">_______________________________________________<o:p></o:p></p>

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<p class="MsoNormal">LLVM Developers mailing list<o:p></o:p></p>

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<p class="MsoNormal"><a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a><o:p></o:p></p>

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<p class="MsoNormal"><a href="http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev"><span style="color:purple">http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</span></a><o:p></o:p></p>

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<p class="MsoNormal"> <o:p></o:p></p>

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<p class="MsoNormal">_______________________________________________<o:p></o:p></p>

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<p class="MsoNormal">LLVM Developers mailing list<o:p></o:p></p>

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<p class="MsoNormal"><a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a><o:p></o:p></p>

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<p class="MsoNormal"><a href="http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev"><span style="color:purple">http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</span></a><o:p></o:p></p>

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<p class="MsoNormal">_______________________________________________<o:p></o:p></p>

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<p class="MsoNormal">LLVM Developers mailing list<o:p></o:p></p>

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<p class="MsoNormal"><a href="mailto:llvm-dev@lists.llvm.org"><span style="color:purple">llvm-dev@lists.llvm.org</span></a><o:p></o:p></p>

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<p class="MsoNormal"><a href="http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev"><span style="color:purple">http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</span></a><o:p></o:p></p>

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