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<p class="MsoNormal">Are you trying to capture information in higher optimization level ?<o:p></o:p></p>
<p class="MsoNormal">If yes, then it will be tricky and you may not get correct information.<o:p></o:p></p>
<p class="MsoNormal">You should be careful with cases where load & stores are optimized by registers.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">You can try address based instrument in your translation units.
<o:p></o:p></p>
<p class="MsoNormal">Whenever you see memory accesses (i.e. load & store) instrument them to print to a file.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">i.e.<o:p></o:p></p>
<p class="MsoNormal">address x100 accessed as store.<o:p></o:p></p>
<p class="MsoNormal">address x200 accessed as store.<o:p></o:p></p>
<p class="MsoNormal">address x100 accessed as store.<o:p></o:p></p>
<p class="MsoNormal">address x100 accessed as load.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Also print variable belongs to address.<o:p></o:p></p>
<p class="MsoNormal">i.e. <o:p></o:p></p>
<p class="MsoNormal">a address is x100<o:p></o:p></p>
<p class="MsoNormal">b address is x200.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">later as a post processing step, process that file to generate consolidated report.<o:p></o:p></p>
<p class="MsoNormal">Sometime adding instrumentation will hurdle few optimizations and generated report
<o:p></o:p></p>
<p class="MsoNormal">may not be the default execution flavor but it will be very closed to it.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Ashutosh<o:p></o:p></p>
<p class="MsoNormal"><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>
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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"> llvmdev-bounces@cs.uiuc.edu [mailto:llvmdev-bounces@cs.uiuc.edu]
<b>On Behalf Of </b>MKT<br>
<b>Sent:</b> Monday, March 09, 2015 4:54 PM<br>
<b>To:</b> llvmdev@cs.uiuc.edu<br>
<b>Subject:</b> [LLVMdev] Counting load and stores of variables<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi all,<o:p></o:p></p>
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<p class="MsoNormal">I’m working on my thesis in which I need to count the number of memory access (i.e. load and stores) of each variable of program. how can I do that? these are some approaches came to my mind : <o:p></o:p></p>
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I need to know during the execution of the program how many load and store instructions are executed on a specific variable, hence simply counting static load and store instructions doesn’t help. <o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
I also cannot write an IR pass to inject some instructions to count memory accesses of variables (instrumenting) , because in IR optimization I’m not aware of what will happen in register allocation. <o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
And if I write a machine pass to inject machine instructions, I guess maybe I loose some informations( e.g. variable names) during the optimizations.<o:p></o:p></li></ul>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">MohammadKazem <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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