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<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Good day LLVM-Dev,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">I hope all are in good health.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">We are currently implementing the compare operation for i64 type in our target.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">The main difference of the i64 type compare to lower integer types is that it performs a library call instead of generating a compare instruction.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">All is good until before ISelDAGToDAG class. We have observed that the difference in a compare operation for i32 and i64 types is that, the 4<sup>th</sup> DAG node of the BRCOND
node is glued for the i32 type and not glued in the i64 type. Please refer to the boxed nodes in the attached DAGs for a better visualization.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Also, upon entering the ISelDAGToDAG class, the i64 type compare library call operation disappeared. I suspect that some optimization between Legalization and ISelDAGToDAG is
removing the library call.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">The compare operation does not have an ISD opcode, only a target specific ISD opcode, which makes it hard to identify where it is being changed in the target independent source
code.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Does anybody know which class between Legalization and ISelDAGToDAG we should look into for this problem? Any kind of information may help.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Also, are there other targets which does a library call for compare operations? This would greatly help us in our study.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Thank you very much in advance! Stay healthy, stay [COVID-19] negative.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Sincerely,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Miguel Inigo J. Manalac<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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