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<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D">Hi Andrea,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D">I’ve updated the patch here:<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><a href="https://reviews.llvm.org/D54603/new/">https://reviews.llvm.org/D54603/new/</a><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D">I have not modified the description in the Phabricator.<span style="mso-spacerun:yes">
</span>Of course, if this solution is the way-forward, then I will be happy to update the change description.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D">I also modified the format of the symbol names (from what I previously describe
in my last response below), to save room:<span style="mso-spacerun:yes"> </span>
“.<span class="SpellE">mca_code_region</span>.<id>.<number>”. <span style="mso-spacerun:yes">
</span>Where “id” is the user’s specified identifier they want associated to the region (cosmetic), and “number” is a module unique number for the region.<span style="mso-spacerun:yes">
</span>I have tested this with non-executable objects, executable files, and multiple objects linking into a single executable.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D">Also, I am trimming this thread up (sorry, but it’s starting to get unwieldy
and I think the mailing list bot is grumpy).<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D">-Matt<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></font></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-font-family:"Times New Roman";font-weight:bold">From:</span></font></b><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-font-family:"Times New Roman"">
Andrea Di Biagio <andrea.dibiagio@gmail.com> <br>
<b><span style="font-weight:bold">Sent:</span></b> Monday, December 17, 2018 10:12 AM<br>
<b><span style="font-weight:bold">To:</span></b> Davis, Matthew <Matthew.Davis@sony.com><br>
<b><span style="font-weight:bold">Cc:</span></b> Simon Pilgrim <llvm-dev@redking.me.uk>; llvm-dev <llvm-dev@lists.llvm.org>; cfe-dev@lists.llvm.org<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [llvm-dev] [RFC][llvm-mca] Adding binary support to llvm-mca.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
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<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Hi Matt,<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
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<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">could you please update the associated patch too?<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Thanks<o:p></o:p></span></font></p>
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<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">-Andrea<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
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<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">On Mon, Dec 17, 2018 at 5:48 PM 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></font></p>
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<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;mso-border-left-alt:solid #CCCCCC .75pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Adding the llvm-dev list, because my email client decides to remove certain lists when I reply-all... including the list that I intend to respond to.<br>
<br>
> -----Original Message-----<br>
> From: Davis, Matthew <<a href="mailto:Matthew.Davis@sony.com" target="_blank">Matthew.Davis@sony.com</a>><br>
> Sent: Monday, December 17, 2018 9:47 AM<br>
> To: Davis, Matthew <<a href="mailto:Matthew.Davis@sony.com" target="_blank">Matthew.Davis@sony.com</a>>;
<a href="mailto:llvm-dev@redking.me.uk" target="_blank">llvm-dev@redking.me.uk</a><br>
> Cc: <a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a><br>
> Subject: RE: [llvm-dev] [RFC][llvm-mca] Adding binary support to llvm-mca.<br>
> <br>
> Just an update to this RFC. (I thought this was going to be a short email... my<br>
> apologies).<br>
> <br>
> One of the primary limitations described in this RFC (earlier in this thread), is that the<br>
> patch for this RFC only handles linked executables. This restriction is due to myself<br>
> wanting to avoid handling relocations in a target specific manner, at least in the<br>
> initial patch. Especially so, since I want to keep the initial patch simple. However,<br>
> sometimes simple and practical are at odds with each other. I envision the main use-<br>
> case of llvm-mca, with binary support, is for analyzing .o files. Probably analyzing .o<br>
> more commonly than fully linked executables. Without handling relocated objects,<br>
> this patch seems rather useless.<br>
> <br>
> I started exploring an alternative solution this weekend to the aforementioned<br>
> problem. This alternative solution avoids having to handle relocations, but does give<br>
> us support for object files (with relocated symbols) and linked executables. The<br>
> change is quite simple, and seems to be effective. In short, we still generate<br>
> intrinsics as discussed in the RFC, one to mark the start of a code region, and<br>
> another to mark the end. These intrinsics get lowered into local symbols. The<br>
> symbols are already encoded with address information about their position in the<br>
> object file. What is different is that we ensure that these symbols have unique<br>
> names and also encode the user provided ID value.<br>
> <br>
> Previously the labels were named like: .Lmca_code_region_start_<number>, and<br>
> similar for .Lmca_code_region_end. The user id number and region size were<br>
> encoded in the .mca_code_regions object file section. Previously mca never looked<br>
> at the symbol table. But, In reality we can calculate the region size by using the<br>
> symbols in the symbol table (look for the mca symbols), instead of relying on the<br>
> information encoded in .mca_code_regions. The alternative approach gets rid of<br>
> that section entirely but achieves the same functionality by encoding the information<br>
> in the symbol name. In short the alternative approach just parses the symbol table<br>
> for MCA symbols, and the symbol names are encoded with the data we need.<br>
> <br>
> The newly proposed name is formatted<br>
> as: .Lmca_code_region_start.<id>.<function>.<number>. Similar for<br>
> mca_code_region_end. 'function' is the function that the marker appears in, 'ID' is<br>
> the user-specified ID (this is a value that users specify for easily identifying the code<br>
> region under analysis... just cosmetic), and 'number' is a unique number to avoid any<br>
> duplicate name conflicts. The benefit of this alternative solution is that we can get<br>
> rid of .mca_code_regions, and gather all of the information llvm-mca needs by<br>
> parsing the symbol table looking for any symbols with the 'mca_code_region_start'<br>
> and 'mca_code_region_end' format discussed above. Of course, if the string table is<br>
> stripped, then we will lose this data. The main drawback from this alternative<br>
> approach is that it relies on encoding symbol names and string processing on those<br>
> names. I'm somewhat biased against doing string parsing, but the code to perform<br>
> this is simple and small, and more importantly it allows llvm-mca to handle linked or<br>
> relocated object files.<br>
> <br>
> -Matt<br>
> <br>
> <br>
> <br>
> > -----Original Message-----<br>
> > From: llvm-dev <<a href="mailto:llvm-dev-bounces@lists.llvm.org" target="_blank">llvm-dev-bounces@lists.llvm.org</a>> On Behalf Of via llvm-dev<br>
> > Sent: Tuesday, December 11, 2018 11:23 AM<br>
> > To: <a href="mailto:llvm-dev@redking.me.uk" target="_blank">llvm-dev@redking.me.uk</a>;
<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a><br>
> > Cc: <a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a><br>
> > Subject: Re: [llvm-dev] [RFC][llvm-mca] Adding binary support to llvm-mca.<br>
> ><br>
> > Thanks for the response Simon. My reply is inline:<br>
> ><br>
> > > From: Simon Pilgrim <<a href="mailto:llvm-dev@redking.me.uk" target="_blank">llvm-dev@redking.me.uk</a>><br>
> > > Sent: Monday, December 10, 2018 1:40 PM<br>
> > ><br>
> > > Hi Matt,<br>
> > ><br>
> > > I can see a near future where perf-analysis tooling uses branch history<br>
> > > profiler captures to determine how often loops/branches are taken and<br>
> > > feeds that into llvm-mca, especially for hot/branchy loop analysis<br>
> > > reports etc. Are you confident that your approach will be easily<br>
> > > extendable for this?<br>
> ><br>
> > That is a very interesting use case. The restriction of a code-region to a single<br>
> block<br>
> > is a limitation for any tools that want to analyze branches. However, I believe<br>
> > that it will be easy to lift this restriction (it's just a check in IR/Verifier). This<br>
> > limitation is not<br>
> > expressed in the llvm-mca driver.<br>
> ><br>
> > If the information is coming from a profile report, then we'd most<br>
> > likely need to extend the llvm-mca driver to accept profile reports. Currently,<br>
> > code regions, from the perspective of the llvm-mca driver, are very simple. They<br>
> are<br>
> > just a collection of MCInst. The binary support in this RFC+patch<br>
> > disassembles just the address range from marker start address for<br>
> > some specified number of bytes. It might be useful to add another driver argument<br>
> > so that a user (or tool) can specify, from the command line, a range of instructions<br>
> > to<br>
> > analyze. I recently added a class for handling inputs to<br>
> > llvm::mca::CodeRegionGenerator,<br>
> > which is just responsible for taking some input and creating a list of MCInst that<br>
> llvm-<br>
> > mca uses.<br>
> > We could subclass this to handle profile reports.<br>
> ><br>
> > > Similarly, being able to generally embed the profile markers in object<br>
> > > libraries for reuse is going to be important for some people - I'd like<br>
> > > to see more of a plan of how this will be achieved. I understand that it<br>
> > > might not be easy for some exe formats.<br>
> ><br>
> > That is definitely a limitation. This initial patch+RFC only handles linked<br>
> > executables (i.e., the llvm-mca marker symbol addresses are resolved).<br>
> > I'm working on a better solution so that this will not be a restriction.<br>
> > In fact, I'll probably delay trying to land any patches until I solve relocations<br>
> > (or use a different solution for identifying start/end addresses for llvm-mca code<br>
> > regions).<br>
> ><br>
> > > Sorry if I'm being too critical, but I'm a bit worried that we end up<br>
> > > with an initial implementation that will take a lot of reworking to meet<br>
> > > our final aims.<br>
> > ><br>
> > > Thanks, Simon.<br>
> ><br>
> > I understand your criticisms and value your input. Thanks a ton!<br>
> ><br>
> > -Matt,<font color="#1f497d"><span style="color:#1F497D"><o:p></o:p></span></font></span></font></p>
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