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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">Hi Quentin,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">Jonas looked further into the problem below, and asked me to submit his patch. Note the we have our own out-of-tree target,
and we have not been able to reproduce this problem on an in-tree target. /Patrik
<span class="SpellE">Hägglund</span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">[<span class="SpellE">MachineSinking</span>] Conservatively clear kill flags after coalescing.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">This solves the problem of having a kill flag inside a loop<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">with a definition of the register prior to the loop:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">%vreg368<<span class="SpellE">def</span>> ...<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">Inside loop:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><span style="mso-spacerun:yes">
</span>%vreg520<<span class="SpellE">def</span>> = COPY %vreg368<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><span style="mso-spacerun:yes">
</span>%vreg568<def,tied1> = add %vreg341<tied0>, %vreg520<kill><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">=> was coalesced into =><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><span style="mso-spacerun:yes">
</span></span><span lang="SV" style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:SV">%vreg568<def,tied1> =
<span class="SpellE">add</span> %vreg341<tied0>, %vreg368<kill><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="SV" style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D;mso-ansi-language:SV"><o:p> </o:p></span></p>
<p class="MsoNormal"><span class="SpellE"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">MachineVerifier</span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">
then complained:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">*** Bad machine code: Virtual register killed in block, but needed live out. ***<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">The kill flag for %vreg368 is incorrect, and is cleared by this patch.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">This is similar to the clearing done at the end of<o:p></o:p></span></p>
<p class="MsoNormal"><span class="SpellE"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">MachineSinking</span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">::<span class="SpellE">SinkInstruction</span>().<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">---<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">lib/<span class="SpellE">CodeGen</span>/MachineSink.cpp | 5 +++++<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">1 file changed, 5 insertions(+)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">diff --<span class="SpellE">git</span> a/lib/<span class="SpellE">CodeGen</span>/MachineSink.cpp b/lib/<span class="SpellE">CodeGen</span>/MachineSink.cpp<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">index 7782001..261af54 100644<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">--- a/lib/<span class="SpellE">CodeGen</span>/MachineSink.cpp<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">+++ b/lib/<span class="SpellE">CodeGen</span>/MachineSink.cpp<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">@@ -157,6 +157,11 @@
<span class="SpellE">bool</span> <span class="SpellE">MachineSinking</span>::<span class="SpellE">PerformTrivialForwardCoalescing</span>(<span class="SpellE">MachineInstr</span> *MI,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><span style="mso-spacerun:yes">
</span>DEBUG(<span class="SpellE">dbgs</span>() << "*** to: " << *MI);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><span style="mso-spacerun:yes">
</span>MRI-><span class="SpellE">replaceRegWith</span>(<span class="SpellE">DstReg</span>,
<span class="SpellE">SrcReg</span>);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><span style="mso-spacerun:yes">
</span>MI-><span class="SpellE">eraseFromParent</span>();<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">+<span style="mso-spacerun:yes">
</span>// Conservatively, clear any kill flags, since it's possible that they are no<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">+<span style="mso-spacerun:yes">
</span>// longer correct.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">+<span style="mso-spacerun:yes">
</span>MRI-><span class="SpellE">clearKillFlags</span>(<span class="SpellE">SrcReg</span>);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">+<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><span style="mso-spacerun:yes">
</span>++<span class="SpellE">NumCoalesces</span>;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><span style="mso-spacerun:yes">
</span>return true;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">--<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D">2.1.0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman""> llvmdev-bounces@cs.uiuc.edu
[mailto:llvmdev-bounces@cs.uiuc.edu] <b>On Behalf Of </b>Quentin Colombet<br>
<b>Sent:</b> den 2 september 2014 18:37<br>
<b>To:</b> Jonas Paulsson<br>
<b>Cc:</b> llvmdev@cs.uiuc.edu<br>
<b>Subject:</b> Re: [LLVMdev] Machine code sinking pass<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman"">Hi Jonas,<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman""><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman"">This looks like a bug in Machine code sinking pass.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman""><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman"">Please file a PR on
<a href="http://llvm.org/bugs">llvm.org/bugs</a> with a reduced test case to keep track of the issue.<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman""><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman"">Thanks,<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman"">-Quentin<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman""><o:p> </o:p></span></p>
<div>
<div>
<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman"">On Sep 2, 2014, at 5:57 AM, Jonas Paulsson <<a href="mailto:jonas.paulsson@ericsson.com">jonas.paulsson@ericsson.com</a>> wrote:<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman""><br style="mso-special-character:line-break">
<![if !supportLineBreakNewLine]><br style="mso-special-character:line-break">
<![endif]><o:p></o:p></span></p>
<div>
<div>
<p class="MsoNormal"><span lang="SV" style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman";mso-ansi-language:SV">Hi,</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="SV" style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman";mso-ansi-language:SV"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman"">I ran into MachineVerifier ”Virtual register killed in block, but needed live out.”<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman"">It was MachineSinking:PerformTrivialForwardCoalescing() that coalesced a COPY inside a single-block loop, but left the<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman"">kill-flag and then MachineVerifier complains that a register in vregsRequired is killed in MBB.<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman"">In the example, %vreg520 is replaced by %vreg368 by PerformTrivialForwardCoalescing(), without clearing the kill flag:<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman"">BB#13: derived from LLVM BB %CF250</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman""> Predecessors according to CFG: BB#12 BB#13 BB#14</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="SV" style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman";mso-ansi-language:SV"> …</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="SV" style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman";mso-ansi-language:SV"> %vreg520<def> = COPY %vreg368</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="SV" style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman";mso-ansi-language:SV"> %vreg568<def,tied1> = cmp %vreg341<tied0>, %vreg520<kill></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="SV" style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman";mso-ansi-language:SV"> <span class="apple-converted-space"> </span></span><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman"">brr_cond
<BB#13></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman""> brr_uncond <BB#14></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman""> Successors according to CFG: BB#13, BB#14</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman"">Into<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman"">BB#13: derived from LLVM BB %CF250</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman""> Predecessors according to CFG: BB#12 BB#13 BB#14</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="SV" style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman";mso-ansi-language:SV"> …</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="SV" style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman";mso-ansi-language:SV"> %vreg568<def,tied1> = cmp %vreg341<tied0>, %vreg368<kill></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="SV" style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman";mso-ansi-language:SV"> <span class="apple-converted-space"> </span></span><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman"">brr_cond
<BB#13></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman""> brr_uncond <BB#14></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman""> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman"">=></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman""> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman"">*** Bad machine code: Virtual register killed in block, but needed live out. ***</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman"">- function: autogen_SD15028</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman"">- basic block: BB#13 CF250 (0x1c75890)</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman"">Virtual register %vreg368 is used after the block.</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman""> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman"">There is only one use of %vreg368 in the function.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman"">One thing that strikes me is that one might want to clear the kill flag for a use inside a loop of a register defined prior to<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman"">the loop?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman"">Best regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman"">Jonas Paulsson<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-font-family:"Times New Roman""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif";mso-fareast-font-family:"Times New Roman"">_______________________________________________<br>
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<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev"><span style="color:purple">http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev</span></a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman""><o:p> </o:p></span></p>
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