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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">You can probably turn on debug information of unroll pass and see why your loop is not getting unrolled.<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>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Try to refer unroll pass options, you may find it useful.<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>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Ashutosh<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>
<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>Lei Wang<br>
<b>Sent:</b> Monday, June 15, 2015 12:59 PM<br>
<b>To:</b> llvmdev@cs.uiuc.edu<br>
<b>Subject:</b> [LLVMdev] Problem About LoopUnroll<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">Hello, everyone.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black"> I have a problem about LoopUnroll: I want to do analysis and transformation on LLVM IR, <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">so I defined a PassManager, and add some Passes to it. I use a LoopUnrollPass likes blow:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">>>...<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">>>Pass Manager Passes;<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">>>Passes.add(...)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">>>Passes.add(createLoopUnrollPass(-1,-1,-1,-1));<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">>>...<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">>>Passes.run(*module);<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">>>WriteBitcodeToFile(...)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black"> The problem is that when I test it using a loop program(compiled it to a *.bc file) it <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">didn't uroll. Why? The createLoopUnrollPass defined as blow:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">>>Pass *llvm::createLoopUnrollPass(int Threshold, int Count, int AllowPartial, int Runtime);<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black"> If I want to uroll a loop fixed number: 3 times, how to set the four parameters?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">Thanks.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt;font-family:NSimSun;color:black">--Wang Lei(BeiJing University of Posts and Telecommunications)<o:p></o:p></span></p>
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