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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">We maintain a set of patches for enabling 24/40-bit MVTs, and also a set of patches to support 16-bit bytes. I can provide them upon request. (Only
llvm, no clang patches yet.)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">/Patrik Hägglund<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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""> llvmdev-bounces@cs.uiuc.edu [mailto:llvmdev-bounces@cs.uiuc.edu]
<b>On Behalf Of </b>Matt Arsenault<br>
<b>Sent:</b> den 4 juni 2015 09:07<br>
<b>To:</b> Volodymyr Arbatov<br>
<b>Cc:</b> llvmdev@cs.uiuc.edu<br>
<b>Subject:</b> Re: [LLVMdev] non-standard machine value types<o:p></o:p></span></p>
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<p class="MsoNormal">On Jun 3, 2015, at 11:48 PM, Volodymyr Arbatov <<a href="mailto:gm.ivlad@gmail.com">gm.ivlad@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif"">Hi all.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif"">I'm looking for a ways of defining register files with non-standard machine value type in tablegen. The value types not covered by SimpleValueType enum. For example (from
the top of my head) 25 bit integers, or 8 way 18 bit integers. These types going to be used with intrinsics so I also need appropriate C custom types defined. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif"">I wonder if I can describe those in tablegen files or do I need to extend llvm. What is the right way of supporting such types?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif"">I'm not familiar will llvm internals so far, so any help and pointers appreciated.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif"">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif"">Volodymyr.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif"">___________________</span><o:p></o:p></p>
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<p class="MsoNormal">You would need an MVT type defined for every legal type you have, so you would need to add those. However, LLVM has a pretty widely spread assumption of 8-bit bytes, so that will be far more problematic for your target. Fixing that would
be a large project.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-Matt<o:p></o:p></p>
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