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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It seems that you are asking whether LLVM can provide a time- and memory-complexity analysis of the source code, and then estimate how a specific given dataset
would be handled by that source code.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It's not the kind of thing that compilers do, and I cannot imagine that LLVM has any way to provide this analysis. The compiler's task is to create a semantically
equivalent transformation of the source code into machine code, it has no need to understand the algorithmic complexity of the input source code.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I don't claim intimate knowledge of llvm-mca, but my understanding is that it looks at relatively small fragments of the compiled code; I'm not aware that it
really understands control-flow, and it certainly has no understanding of memory consumption.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">--paulr<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></a></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""> llvm-dev [mailto:llvm-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>hameeza ahmed via llvm-dev<br>
<b>Sent:</b> Thursday, December 20, 2018 3:08 PM<br>
<b>To:</b> llvm-dev<br>
<b>Subject:</b> [llvm-dev] Memory Consumption and Execution Time static Statistics in LLVM. Can llvm-mca help?<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">Hello,<o:p></o:p></p>
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<p class="MsoNormal">I am PhD student. My work deals with finding the <b>memory (RAM) consumption</b> as indicated by
<b>linux RSS</b> output and <b>execution time </b>as indicated by<b> linux time</b> command at compile time using LLVM. How can I do this? Like if i pass dataset size and application to llvm compiler, it should tell the
<b>estimated memory consumption</b> and <b>time taken</b> to execute given application with given dataset, but all at compile time? I am trying to avoid profiling here. I wont get accurate values, hence rough estimated values of memory consumption and time
are enough...<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Can llvm-mca help me in finding these statistics? or I need to write a new compiler analysis pass to find these values?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Please help how to proceed.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> Thank You<o:p></o:p></p>
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<p class="MsoNormal">Regards<o:p></o:p></p>
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