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<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-family:"Helvetica",sans-serif;color:black">> Would this proposal help: </span></a><a href="https://reviews.llvm.org/D22793" target="_blank"><span style="font-family:"Helvetica",sans-serif">https://reviews.llvm.org/D22793</span></a><span style="font-family:"Helvetica",sans-serif;color:black"> ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">> Yes, it looks like that would help.<br>
<br>
</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">Thank you. I’ll try to get more info from the author.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Btw, Intel compiler vectorizes this loop and, probably, it is the right thing to do.<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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</span></span></span><![endif]><span dir="LTR"></span><b><i><span style="color:#2F5496"> Elena<o:p></o:p></span></i></b></p>
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<p class="MsoNormal"><a name="_____replyseparator"></a><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"> Hal Finkel [mailto:hfinkel@anl.gov]
<br>
<b>Sent:</b> Tuesday, July 26, 2016 21:54<br>
<b>To:</b> Mehdi Amini <mehdi.amini@apple.com><br>
<b>Cc:</b> Demikhovsky, Elena <elena.demikhovsky@intel.com>; llvm-dev <llvm-dev@lists.llvm.org><br>
<b>Subject:</b> Re: [llvm-dev] Alias Analysis with inbound GEPs<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-family:"Helvetica",sans-serif;color:black">From:
</span></b><span style="font-family:"Helvetica",sans-serif;color:black">"Mehdi Amini" <<a href="mailto:mehdi.amini@apple.com">mehdi.amini@apple.com</a>><br>
<b>To: </b>"Hal Finkel" <<a href="mailto:hfinkel@anl.gov">hfinkel@anl.gov</a>><br>
<b>Cc: </b>"Elena Demikhovsky" <<a href="mailto:elena.demikhovsky@intel.com">elena.demikhovsky@intel.com</a>>, "llvm-dev" <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>><br>
<b>Sent: </b>Tuesday, July 26, 2016 1:37:28 PM<br>
<b>Subject: </b>Re: [llvm-dev] Alias Analysis with inbound GEPs<br>
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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black">On Jul 25, 2016, at 10:16 AM, Hal Finkel via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-family:"Helvetica",sans-serif;color:black">From:<span class="apple-converted-space"> </span></span></b><span style="font-family:"Helvetica",sans-serif;color:black">"Elena via llvm-dev Demikhovsky"
<<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>><br>
<b>To:<span class="apple-converted-space"> </span></b>"llvm-dev" <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>><br>
<b>Sent:<span class="apple-converted-space"> </span></b>Monday, July 25, 2016 9:45:55 AM<br>
<b>Subject:<span class="apple-converted-space"> </span></b>[llvm-dev] Alias Analysis with inbound GEPs</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><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:black">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;color:black"> <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:black">I’m checking aliasing of two pointers:<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:black"> <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:black"> %GEP1 = getelementptr inbounds %struct.s, %struct.s* %0, i64 0, i32 1, i64 %indvars.iv41, i64 %indvars.iv39<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:black"> %GEP2 = getelementptr inbounds %struct.s, %struct.s* %0, i64 0, i32 16<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:black"> <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:black">The result I got is “PartialAlias” because the indices of the GEP1 are variable.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">That seems like a bug. PartialAlias should only be returned when we can prove a partial overlap. Otherwise, MayAlias should be returned.<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:black">Shouldn’t the “inbounds” keyword mean that the access to sub-array is also in-bounds?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">No. inbounds applies only to the whole object.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black">Would this proposal help: <a href="https://reviews.llvm.org/D22793" target="_blank">https://reviews.llvm.org/D22793</a> ?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Yes, it looks like that would help.<br>
<br>
-Hal<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black">— <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black">Mehdi<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black"><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:black">I’m trying to reach “NoAlias” consensus between GEP1 and GEP2.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Did the original code come from C or C++? What are we modeling here?<br>
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-Hal<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:black"> <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:black">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;color:black"> <o:p></o:p></span></p>
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<![if !supportLists]><span style="font-size:10.0pt;font-family:Symbol;color:#2F5496"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span dir="LTR"></span><b><i><span style="color:#2F5496">Elena</span></i></b><span style="color:#2F5496"><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:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black">---------------------------------------------------------------------<br>
Intel Israel (74) Limited<o:p></o:p></span></p>
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--<span class="apple-converted-space"> </span><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Hal Finkel<br>
Assistant Computational Scientist<br>
Leadership Computing Facility<br>
Argonne National Laboratory<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black">_______________________________________________<br>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Hal Finkel<br>
Assistant Computational Scientist<br>
Leadership Computing Facility<br>
Argonne National Laboratory<o:p></o:p></span></p>
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