<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><br><div><div>On Jan 3, 2013, at 12:03 PM, Weiming Zhao <<a href="mailto:weimingz@codeaurora.org">weimingz@codeaurora.org</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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</o:shapelayout></xml><![endif]--><div lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Yes, I tried to use CopyToReg/CopyFromReg to enforce the order. The issue is “Untyped” data type.</span></p></div></div></blockquote><blockquote type="cite"><div lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><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">The REG_SEQUENCE and EXTRACT_SUBREG has to use “Untyped” data type. However, CopyToReg/CopyFromReg doesn’t support such data type.</span></p></div></div></blockquote><div><br></div><div>Why not?</div><br><blockquote type="cite"><div lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><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"> </span><span style="color: rgb(31, 73, 125); font-family: Calibri, sans-serif; font-size: 11pt;">And I explicitly add a glue edge between the Extract_subreg and inline asm:</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">SDValue E0 = SDValue(CurDAG->getMachineNode(TargetOpcode::EXTRACT_SUBREG,<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> dl, MVT::i32, MVT::Glue, PairedReg,<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> CurDAG->getTargetConstant(ARM::gsub_0, MVT::i32),<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> Chain.getValue(1) </span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">è</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> Guarantees that this node is emitted after the linlineasm<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> ), 0);<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">In other words, this node has the same effect as CopyFromReg.</span></p></div></div></blockquote><div><br></div><div>Your DAG may work, but your changes still allow bad DAGs to be emitted. Plus, as I said, it's not necessary.</div><div><br></div><div>/jakob</div></div></body></html>