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<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Hi 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">Upon investigation, to implement the custom library calls, we have to do the following:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:"Meiryo UI","sans-serif";color:black"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-family:"Meiryo UI","sans-serif";color:black">Add cases for the operations in getRTLibDesc static function (LegalizerHelper.cpp)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:"Meiryo UI","sans-serif";color:black"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-family:"Meiryo UI","sans-serif";color:black">Add cases for the operations in SelectionDAGLegalize::ConvertNodeToLibcall (LegalizeDAG.cpp)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:"Meiryo UI","sans-serif";color:black"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-family:"Meiryo UI","sans-serif";color:black">Add the enums for the operations in the RuntimeLibcalls.def<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:"Meiryo UI","sans-serif";color:black"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-family:"Meiryo UI","sans-serif";color:black">Add a setLibcallName function call for each operation and implement Lower operations in the target ISelLowering class
<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 do not want to modify non-target files/projects as this will have side effects for other targets. Will this be possible?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">If not, are there boolean functions available for checking the triple/architecture used in the mentioned classes above? Example : isArch(x86)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Does setLibcallName(RTLIB::SDIV_I8, nullptr) set the RTLIB::SDIV_I8 as not supported?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Is there a guide that exists which could help us in implementing custom library calls? Or perhaps a target which implemented something like this? I have checked google and the
LLVM youtube channel, not much 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">Thank you very much in advance for all the 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">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Miguel<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>
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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""> Miguel Inigo J. Manalac
<br>
<b>Sent:</b> March 02, 2020 3:34 PM<br>
<b>To:</b> llvm-dev<br>
<b>Subject:</b> RTLIB and Custom Library calls<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Hello 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">Most of the processing for i64 and f64 types for our backend are emulation library calls. Some of the library calls are not defined in the RuntimeLibcalls.def Libcall enum so
we have to define custom library calls. <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">How is the ideal way of implementing the custom library calls? Providing us with a target backend having a similar functionality would also help us significantly.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Say for a i64 type compare, does adding it in the RuntimeLibcalls.def enum, SelectionDAGLegalize::ConvertNodeToLibcall function, and the target ISelLowering Class solve our
problem?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Is it okay to modify RuntimeLibcalls.def and SelectionDAGLegalize::ConvertNodeToLibcall function?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">A starting point for processing lib calls other than the ISelLowering class would also 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">Thank you in advance for your 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">Sincerely,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Meiryo UI","sans-serif";color:black">Miguel Inigo J. Manalac (1852)<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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