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<p class="MsoNormal">Create a pseudo-instruction that represents these two, and expand it into the actual instructions late, after optimizations.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Consolas">-- </span>
<span style="font-size:9.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Consolas">Krzysztof Parzyszek
<a href="mailto:kparzysz@quicinc.com"><span style="color:#0563C1">kparzysz@quicinc.com</span></a> AI tools development<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> llvm-dev <llvm-dev-bounces@lists.llvm.org> <b>On Behalf Of
</b>Przemyslaw Ossowski via llvm-dev<br>
<b>Sent:</b> Tuesday, December 10, 2019 10:42 AM<br>
<b>To:</b> llvm-dev <llvm-dev@lists.llvm.org><br>
<b>Subject:</b> [EXT] [llvm-dev] Glue two instructions together<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">for DAG-to-DAG instruction selection I’ve implemented a pattern, which creates from one SDNode two instructions, something like:<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">def: Pat<(NEW_SDNODE REG:$r1),</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> (INST_OUT (INST_IN), REG:$r1)>;</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> </span><o:p></o:p></p>
<p class="MsoNormal">where INST_IN doesn't accepts any inputs and INST_OUT accepts two inputs - one returned by INST_IN and REG;$r1.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is there any possibility to ‘Glue’ two instruction created in a such way? Maybe something similar to creation SDNodes with SDNPOutGlue, SDNPInGlue) ?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">These two instructions INST_IN and INST_OUT have to be one after another without any other inserted between them.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Przemek<o:p></o:p></p>
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