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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi Graham,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I’ve almost finished my runs. However I’ve got couple compiler crashes:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">!dbg attachment points at wrong subprogram for function<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">LLVM ERROR: Broken module found, compilation aborted!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">This will take some time to investigate.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Evgeny Astigeevich<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Graham Yiu <gyiu@ca.ibm.com><br>
<b>Date: </b>Tuesday, 7 November 2017 at 16:19<br>
<b>To: </b>Evgeny Astigeevich <Evgeny.Astigeevich@arm.com><br>
<b>Cc: </b>"junbuml@codeaurora.org" <junbuml@codeaurora.org>, "llvm-dev@lists.llvm.org" <llvm-dev@lists.llvm.org>, nd <nd@arm.com>, Tobias Grosser <tobias.grosser@inf.ethz.ch><br>
<b>Subject: </b>Re: [llvm-dev] [RFC] Enable Partial Inliner by default<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<p><a name="_MailOriginalBody"><span style="font-size:10.0pt">Hi Evgeny,</span><br>
<br>
</a><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">When you think the experiments on armv7m and armv6m targets will be complete? We're looking to turn this on sooner rather than later, if there aren't objections from folks running
on other platforms.</span><br>
<br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">Cheers,</span><br>
<br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">Graham Yiu<br>
LLVM Compiler Development<br>
IBM Toronto Software Lab<br>
Office: (905) 413-4077 C2-707/8200/Markham<br>
Email: gyiu@ca.ibm.com</span><br>
<br>
<img width="16" height="16" style="width:.1666in;height:.1666in" id="_x0000_i1028" src="cid:image001.gif@01D358DE.BC583E00" alt="Inactive hide details for Graham Yiu---11/03/2017 12:40:10 PM---Hi Evgeny, Yes, please do. It was our hope that folks would ve"></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;color:#424282">Graham
Yiu---11/03/2017 12:40:10 PM---Hi Evgeny, Yes, please do. It was our hope that folks would verify the impact of the partial inline</span><br>
<br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;color:#5F5F5F">From:
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">Graham Yiu/Toronto/IBM</span><br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;color:#5F5F5F">To:
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">Evgeny Astigeevich <Evgeny.Astigeevich@arm.com></span><br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;color:#5F5F5F">Cc:
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">"junbuml@codeaurora.org" <junbuml@codeaurora.org>, "llvm-dev@lists.llvm.org" <llvm-dev@lists.llvm.org>, nd <nd@arm.com>, Tobias Grosser <tobias.grosser@inf.ethz.ch></span><br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;color:#5F5F5F">Date:
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">11/03/2017 12:40 PM</span><br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;color:#5F5F5F">Subject:
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">Re: [llvm-dev] [RFC] Enable Partial Inliner by default</span><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_MailOriginalBody"><br>
<br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">Hi Evgeny,</span></span><span style="mso-bookmark:_MailOriginalBody"><br>
<br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">Yes, please do. It was our hope that folks would verify the impact of the partial inliner on the platforms they're currently working on.</span></span><span style="mso-bookmark:_MailOriginalBody"><br>
<br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">Cheers,</span></span><span style="mso-bookmark:_MailOriginalBody"><br>
<br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">Graham Yiu<br>
LLVM Compiler Development<br>
IBM Toronto Software Lab<br>
Office: (905) 413-4077 C2-707/8200/Markham<br>
Email: gyiu@ca.ibm.com</span></span><span style="mso-bookmark:_MailOriginalBody"><br>
<br>
<br>
<img width="16" height="16" style="width:.1666in;height:.1666in" id="_x0000_i1026" src="cid:image001.gif@01D358DE.BC583E00" alt="Inactive hide details for Evgeny Astigeevich ---11/03/2017 12:18:05 PM---Hi, We'd like to check impact on armv7m and armv6m tar"></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;color:#424282">Evgeny
Astigeevich ---11/03/2017 12:18:05 PM---Hi, We'd like to check impact on armv7m and armv6m targets, especially code size. We have not tried</span></span><span style="mso-bookmark:_MailOriginalBody"><br>
<br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;color:#5F5F5F">From:
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">Evgeny Astigeevich <Evgeny.Astigeevich@arm.com></span></span><span style="mso-bookmark:_MailOriginalBody"><br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;color:#5F5F5F">To:
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">Tobias Grosser <tobias.grosser@inf.ethz.ch>, Graham Yiu <gyiu@ca.ibm.com></span></span><span style="mso-bookmark:_MailOriginalBody"><br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;color:#5F5F5F">Cc:
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">"junbuml@codeaurora.org" <junbuml@codeaurora.org>, "llvm-dev@lists.llvm.org" <llvm-dev@lists.llvm.org>, nd <nd@arm.com></span></span><span style="mso-bookmark:_MailOriginalBody"><br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;color:#5F5F5F">Date:
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">11/03/2017 12:18 PM</span></span><span style="mso-bookmark:_MailOriginalBody"><br>
</span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;color:#5F5F5F">Subject:
</span></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt">Re: [llvm-dev] [RFC] Enable Partial Inliner by default</span></span><span style="mso-bookmark:_MailOriginalBody"><o:p></o:p></span></p>
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<br>
<br>
</span><span style="mso-bookmark:_MailOriginalBody"><tt><span style="font-size:10.0pt">Hi,</span></tt></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Courier New""><br>
<br>
<br>
<br>
<tt>We'd like to check impact on armv7m and armv6m targets, especially code size. We have not tried the partial inliner on them.</tt><br>
<br>
<br>
<br>
<tt>Could a decision to turn it on by default wait for results?</tt><br>
<br>
<br>
<br>
<tt>Thanks,</tt><br>
<br>
<tt>Evgeny Astigeevich</tt><br>
<br>
<tt>The Arm Compiler Optimization team</tt><br>
<br>
<br>
<br>
<tt>-----Original Message-----</tt><br>
<br>
<tt>From: llvm-dev <llvm-dev-bounces@lists.llvm.org> on behalf of Tobias Grosser via llvm-dev <llvm-dev@lists.llvm.org></tt><br>
<br>
<tt>Reply-To: Tobias Grosser <tobias.grosser@inf.ethz.ch></tt><br>
<br>
<tt>Date: Thursday, 2 November 2017 at 23:32</tt><br>
<br>
<tt>To: Graham Yiu <gyiu@ca.ibm.com>, "llvm-dev@lists.llvm.org" <llvm-dev@lists.llvm.org></tt><br>
<br>
<tt>Cc: "junbuml@codeaurora.org" <junbuml@codeaurora.org></tt><br>
<br>
<tt>Subject: Re: [llvm-dev] [RFC] Enable Partial Inliner by default</tt><br>
<br>
<br>
<br>
<tt>Hi Graham,</tt><br>
<br>
<br>
<br>
<tt>I think this is a good idea. It is also useful for libquantum, where</tt><br>
<br>
<tt>together with some other changes, it enables Polly to perform libfusion.</tt><br>
<br>
<br>
<br>
<tt>The ARM people also played with the partial inliner and might have</tt><br>
<br>
<tt>feedback.</tt><br>
<br>
<br>
<br>
<tt>Best,</tt><br>
<br>
<tt>Tobias</tt><br>
<br>
<br>
<br>
<tt>On Thu, Nov 2, 2017, at 23:05, Graham Yiu via llvm-dev wrote:</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> Forgot to add that all experiments were done with '-O3 -m64</tt><br>
<br>
<tt>> -fexperimental-new-pass-manager'.</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> Graham Yiu</tt><br>
<br>
<tt>> LLVM Compiler Development</tt><br>
<br>
<tt>> IBM Toronto Software Lab</tt><br>
<br>
<tt>> Office: (905) 413-4077 C2-707/8200/Markham</tt><br>
<br>
<tt>> Email: gyiu@ca.ibm.com</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> From: Graham Yiu/Toronto/IBM</tt><br>
<br>
<tt>> To: llvm-dev@lists.llvm.org</tt><br>
<br>
<tt>> Cc: junbuml@codeaurora.org, xinliangli@gmail.com</tt><br>
<br>
<tt>> Date: 11/02/2017 05:26 PM</tt><br>
<br>
<tt>> Subject: [RFC] Enable Partial Inliner by default</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> Hello,</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> I'd like to propose turning on the partial inliner</tt><br>
<br>
<tt>> (-enable-partial-inlining) by default.</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> We've seen small gains on SPEC2006/2017 runtimes as well as lnt</tt><br>
<br>
<tt>> compile-times with a 2nd stage bootstrap of LLVM. We also saw positive</tt><br>
<br>
<tt>> gains on our internal workloads.</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> -------------------------------------</tt><br>
<br>
<tt>> Brief description of Partial Inlining</tt><br>
<br>
<tt>> -------------------------------------</tt><br>
<br>
<tt>> A pass in opt that runs after the normal inlining pass. Looks for</tt><br>
<br>
<tt>> branches</tt><br>
<br>
<tt>> to a return block in the entry and immediate successor blocks of a</tt><br>
<br>
<tt>> function. If found, it outlines the rest of the function using the</tt><br>
<br>
<tt>> CodeExtractor. It then attempts to inline the leftover entry block (and</tt><br>
<br>
<tt>> possibly one or more of its successors) to all its callers. This</tt><br>
<br>
<tt>> effectively peels the early return block(s) into the caller, which could</tt><br>
<br>
<tt>> be</tt><br>
<br>
<tt>> executed without incurring the call overhead of the function just to</tt><br>
<br>
<tt>> return</tt><br>
<br>
<tt>> immediately. Inlining and call overhead cost, as well as branch</tt><br>
<br>
<tt>> probabilities of the return block(s) are taken into account before</tt><br>
<br>
<tt>> inlining</tt><br>
<br>
<tt>> is done. If inlining is not successful, then the changes are discarded.</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> eg.</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> void foo() {</tt><br>
<br>
<tt>> bar();</tt><br>
<br>
<tt>> // rest of the code in foo</tt><br>
<br>
<tt>> }</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> void bar() {</tt><br>
<br>
<tt>> if (X)</tt><br>
<br>
<tt>> return;</tt><br>
<br>
<tt>> // rest of code (to be outlined)</tt><br>
<br>
<tt>> }</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> After Partial Inlining:</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> void foo() {</tt><br>
<br>
<tt>> if (!X)</tt><br>
<br>
<tt>> bar.outlined();</tt><br>
<br>
<tt>> // rest of the code in foo</tt><br>
<br>
<tt>> }</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> void bar.outlined() {</tt><br>
<br>
<tt>> // rest of the code in bar</tt><br>
<br>
<tt>> }</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> Here are the numbers on a Power8 PPCLE running Ubuntu 15.04 in ST-mode</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> ----------------------------------------------</tt><br>
<br>
<tt>> Runtime performance (speed)</tt><br>
<br>
<tt>> ----------------------------------------------</tt><br>
<br>
<tt>> Workload Improvement</tt><br>
<br>
<tt>> -------- -----------</tt><br>
<br>
<tt>> SPEC2006(C/C++) 0.06% (geomean)</tt><br>
<br>
<tt>> SPEC2017(C/C++) 0.10% (geomean)</tt><br>
<br>
<tt>> ----------------------------------------------</tt><br>
<br>
<tt>> Compile time performance for Bootstrapped LLVM</tt><br>
<br>
<tt>> ----------------------------------------------</tt><br>
<br>
<tt>> Workload Improvement</tt><br>
<br>
<tt>> -------- -----------</tt><br>
<br>
<tt>> SPEC2006(C/C++) 0.41% (cumulative)</tt><br>
<br>
<tt>> SPEC2017(C/C++) -0.16% (cumulative)</tt><br>
<br>
<tt>> lnt 0.61% (geomean)</tt><br>
<br>
<tt>> ----------------------------------------------</tt><br>
<br>
<tt>> Compile time performance</tt><br>
<br>
<tt>> ----------------------------------------------</tt><br>
<br>
<tt>> Workload Increase</tt><br>
<br>
<tt>> -------- --------</tt><br>
<br>
<tt>> SPEC2006(C/C++) 1.31% (cumulative)</tt><br>
<br>
<tt>> SPEC2017(C/C++) 0.25% (cumulative)</tt><br>
<br>
<tt>> ----------------------------------------------</tt><br>
<br>
<tt>> Code size</tt><br>
<br>
<tt>> ----------------------------------------------</tt><br>
<br>
<tt>> Workload Increase</tt><br>
<br>
<tt>> -------- --------</tt><br>
<br>
<tt>> SPEC2006(C/C++) 3.90% (geomean)</tt><br>
<br>
<tt>> SPEC2017(C/C++) 1.05% (geomean)</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> NOTE1: Code size increase in SPEC2006 was mainly attributed to benchmark</tt><br>
<br>
<tt>> "astar", which increased by 86%. Removing this outlier, we get a more</tt><br>
<br>
<tt>> reasonable increase of 0.58%.</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> NOTE2: There is a patch up for review on Phabricator to enhance the</tt><br>
<br>
<tt>> partial</tt><br>
<br>
<tt>> inliner with the presence of profiling information (</tt><br>
<br>
<tt>> </tt></span></span><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__reviews.llvm.org_D38190&d=DwIGaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=4ST7e3kMd0GTi3w9ByK5Cw&m=sY89ox2ivgmox5Vg311rAsEr4WFT-o-LRopDU9e7rl0&s=6o17wydYZM0l4kPAb3l3cJ95JRPoYb-3l4sHv-R0GaA&e="><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Courier New"">https://urldefense.proofpoint.com/v2/url?u=https-3A__reviews.llvm.org_D38190&d=DwIGaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=4ST7e3kMd0GTi3w9ByK5Cw&m=sY89ox2ivgmox5Vg311rAsEr4WFT-o-LRopDU9e7rl0&s=6o17wydYZM0l4kPAb3l3cJ95JRPoYb-3l4sHv-R0GaA&e=</span></span><span style="mso-bookmark:_MailOriginalBody"></span></a><span style="mso-bookmark:_MailOriginalBody"><tt><span style="font-size:10.0pt">).</span></tt></span><span style="mso-bookmark:_MailOriginalBody"><span style="font-size:10.0pt;font-family:"Courier New""><br>
<br>
<tt>> </tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> Graham Yiu</tt><br>
<br>
<tt>> LLVM Compiler Development</tt><br>
<br>
<tt>> IBM Toronto Software Lab</tt><br>
<br>
<tt>> Office: (905) 413-4077 C2-707/8200/Markham</tt><br>
<br>
<tt>> Email: gyiu@ca.ibm.com</tt><br>
<br>
<tt>> </tt><br>
<br>
<tt>> _______________________________________________</tt><br>
<br>
<tt>> LLVM Developers mailing list</tt><br>
<br>
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