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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This issue comes up every once in a while, see for example:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-January/069767.html">http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-January/069767.html</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Or, for something much older:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="http://llvm.org/bugs/show_bug.cgi?id=6393">http://llvm.org/bugs/show_bug.cgi?id=6393</a><o:p></o:p></span></p>
<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 bottom line is that, unfortunately, there is no good way to enforce that at the IR level.<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></a></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span 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>RAVI KORSA<br>
<b>Sent:</b> Wednesday, October 01, 2014 10:50<br>
<b>To:</b> Jonathan Roelofs<br>
<b>Cc:</b> LLVM Developers Mailing List<br>
<b>Subject:</b> Re: [LLVMdev] Behaviour of NVPTX intrinsic<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:115%">I understand that. Once the control reaches the target back-end, I can disallow instructions moving around an intrinsic by defining an SDNode for the intrinsic, setting it's properties appropriately
and custom lowering it etc. But my question was aimed at how do we stop the "opt" passes from moving the arithmetic instructions around the intrinsic. For example we have "llvm.arm.set.fpscr" intrinsic to set the rounding mode of the arithmetic instructions
following it. But if "opt" passes move arithmetic instructions around it, then the expected results are wrong. Am trying to check if anyone has a solution for this already.
<o:p></o:p></p>
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<p class="MsoNormal" style="line-height:115%">Thanks. <o:p></o:p></p>
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