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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Sorry, I meant the function AddOptimizationPasses (line 365 of llvm/tools/opt/opt.cpp in latest trunk).<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">John<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>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Yafei Liu [mailto:yfliu@mobvoi.com]
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<b>Sent:</b> 16 October 2019 03:07<br>
<b>To:</b> John Brawn<br>
<b>Cc:</b> LLVM Development List<br>
<b>Subject:</b> Re: [llvm-dev] Easy way to add common pass for optimization<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">Hi John, I didn't find any file named AddOptimizationLevel.cpp in my llvm project, where is it?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Tue, Oct 15, 2019 at 8:39 PM John Brawn <<a href="mailto:John.Brawn@arm.com">John.Brawn@arm.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It depends on if you’re using the new or old pass managers, though if you’re following that tutorial
you’re probably using the old</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">one (looking at
<a href="https://llvm.org/docs/tutorial/MyFirstLanguageFrontend/LangImpl04.html#llvm-optimization-passes" target="_blank">
https://llvm.org/docs/tutorial/MyFirstLanguageFrontend/LangImpl04.html#llvm-optimization-passes</a>).</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If so then you can use PassManagerBuilder (<a href="http://llvm.org/doxygen/classllvm_1_1PassManagerBuilder.html" target="_blank">http://llvm.org/doxygen/classllvm_1_1PassManagerBuilder.html</a>).
It may be also</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">worthwhile looking at what opt does (AddOptimizationLevel.cpp in opt.cpp) as it uses PassManagerBuilder
but does something</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">a bit more complex than just setting the optlevel then populating the pass manager (but maybe just
setting optlevel is all you</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">need for your purposes).</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">John</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> llvm-dev
[mailto:<a href="mailto:llvm-dev-bounces@lists.llvm.org" target="_blank">llvm-dev-bounces@lists.llvm.org</a>]
<b>On Behalf Of </b>Yafei Liu via llvm-dev<br>
<b>Sent:</b> 15 October 2019 09:54<br>
<b>To:</b> llvm-dev<br>
<b>Subject:</b> [llvm-dev] Easy way to add common pass for optimization</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi all, <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I wrote a compiler front end which generates IR codes, but due to the logic, the IR codes have a lot of instructions like unnecessary br jump, basic block creation, load instructions and
expression which can be simplified.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">now I want to use built in passes to optimize the generated code, but after I read the tutorial: <a href="https://llvm.org/docs/tutorial/MyFirstLanguageFrontend" target="_blank">https://llvm.org/docs/tutorial/MyFirstLanguageFrontend</a>,
I found that I have to add passess one by one, on function level.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I know these passes for module level, but I don't know what passes I should add, and I do not have special optimization requirements, so built-in passes will meet my requirements,
So this there any easy way to add most common passes which all compilers will probable used?<o:p></o:p></p>
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