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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><Copied llvm-dev><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">Thanks Silviu.<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">> “getRuntimePointerChecking()->getChecks().empty()”:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">> Wouldn’t that mean that you won’t emit run-time alias checks?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Yes, if generated checks are empty then we won’t emit alias check.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">As we are dependent on LAA for runtime checks, will not perform<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">versioning if alias checks doesn’t exists.<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">> I think you could filter the set of checks (something like
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">> collectMemchecks from LoopLoadElimination).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Sure, will look into it.<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">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Ashutosh</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></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"> Silviu Baranga [mailto:Silviu.Baranga@arm.com]
<br>
<b>Sent:</b> Tuesday, January 19, 2016 6:20 PM<br>
<b>To:</b> Nema, Ashutosh; anemet@apple.com; Hal Finkel; listmail@philipreames.com; Charlie Turner<br>
<b>Cc:</b> tobias@grosser.es; mehdi.amini@apple.com<br>
<b>Subject:</b> RE: Dependency checking in LoopAccessAnalysis<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Correct, you wouldn’t check canVectorizeMemory() in this case.<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">“getRuntimePointerChecking()->getChecks().empty()”:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Wouldn’t that mean that you won’t emit run-time alias checks?<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">I think you could filter the set of checks (something like collectMemchecks from LoopLoadElimination).<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">Also, should this be on llvm-dev (perhaps you’ve accidentally not added it?).<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">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Silviu<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>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> Nema, Ashutosh [<a href="mailto:Ashutosh.Nema@amd.com">mailto:Ashutosh.Nema@amd.com</a>]
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<b>Sent:</b> 19 January 2016 12:11<br>
<b>To:</b> Silviu Baranga; <a href="mailto:anemet@apple.com">anemet@apple.com</a>; Hal Finkel;
<a href="mailto:listmail@philipreames.com">listmail@philipreames.com</a>; Charlie Turner<br>
<b>Cc:</b> <a href="mailto:tobias@grosser.es">tobias@grosser.es</a>; <a href="mailto:mehdi.amini@apple.com">
mehdi.amini@apple.com</a><br>
<b>Subject:</b> RE: Dependency checking in LoopAccessAnalysis<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Sorry there was a typo in my previous mail:<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">“getRuntimePointerChecking()->empty()”
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">è</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> “getRuntimePointerChecking()->getChecks().empty()”<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">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Ashutosh<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>
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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"> Nema, Ashutosh
<br>
<b>Sent:</b> Tuesday, January 19, 2016 5:30 PM<br>
<b>To:</b> 'Silviu Baranga'; <a href="mailto:anemet@apple.com">anemet@apple.com</a>; Hal Finkel;
<a href="mailto:listmail@philipreames.com">listmail@philipreames.com</a>; Charlie Turner<br>
<b>Cc:</b> <a href="mailto:tobias@grosser.es">tobias@grosser.es</a>; <a href="mailto:mehdi.amini@apple.com">
mehdi.amini@apple.com</a><br>
<b>Subject:</b> RE: Dependency checking in LoopAccessAnalysis<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks Silviu.<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">Instead of checking “canVectorizeMemory” we can “getRuntimePointerChecking()->empty()”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">If runtime checks are empty then avoid versioning, else go ahead with LoopVersioningLICM.<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">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Ashutosh<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>
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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"> Silviu Baranga [</span><a href="mailto:Silviu.Baranga@arm.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">mailto:Silviu.Baranga@arm.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">]
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<b>Sent:</b> Tuesday, January 19, 2016 4:28 PM<br>
<b>To:</b> Nema, Ashutosh; </span><a href="mailto:anemet@apple.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">anemet@apple.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">; Hal Finkel;
</span><a href="mailto:listmail@philipreames.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">listmail@philipreames.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">; Charlie Turner<br>
<b>Cc:</b> </span><a href="mailto:tobias@grosser.es"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">tobias@grosser.es</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">;
</span><a href="mailto:mehdi.amini@apple.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">mehdi.amini@apple.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><br>
<b>Subject:</b> RE: Dependency checking in LoopAccessAnalysis<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Ashutosh,<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">The interface to LoopAccessAnalysis allows a user to reason about the dependences<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">and construct a set of appropriate run-time checks.<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">The best example I can think of for this would be the LoopLoadElimination pass, which<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">doesn’t require the loop to be vectorizable and can work with unknown dependences.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">It should be possible to do the same for LICM versioning.<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">Note that we also use parts of the dependence checking to reduce the number of<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">run-time checks emitted.<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">I hope this helps.<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">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Silviu<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"><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>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> Nema, Ashutosh [</span><a href="mailto:Ashutosh.Nema@amd.com"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">mailto:Ashutosh.Nema@amd.com</span></a><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">]
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<b>Sent:</b> 19 January 2016 10:28<br>
<b>To:</b> </span><a href="mailto:anemet@apple.com"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">anemet@apple.com</span></a><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">; Hal Finkel;
</span><a href="mailto:listmail@philipreames.com"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">listmail@philipreames.com</span></a><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">; Charlie Turner<br>
<b>Cc:</b> </span><a href="mailto:tobias@grosser.es"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">tobias@grosser.es</span></a><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">;
</span><a href="mailto:mehdi.amini@apple.com"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">mehdi.amini@apple.com</span></a><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">; Silviu Baranga<br>
<b>Subject:</b> Dependency checking in LoopAccessAnalysis<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"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hi,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Found LoopAccessAnalysis is tied up with memory dependency checking.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">This dependency checking is important for LoopVectorizer but may not for other optimizations.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">i.e. LoopVersioningLICM may not require this dependency checking.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Only it need is runtime pointer checks to assert the no-alias behavior.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Please correct this understand if wrong.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">If this is correct, can we make this dependency checking optional in LoopAccessAnalysis ?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Ashutosh<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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