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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Ping?<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='color:#1F497D'>Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation</span><span style='color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><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"'> Weiming Zhao [mailto:weimingz@codeaurora.org] <br><b>Sent:</b> Friday, January 03, 2014 12:08 PM<br><b>To:</b> llvm-commits@cs.uiuc.edu<br><b>Subject:</b> [Patch] [ThumbV8] Fix assertion fails due to inconsistent CPSR liveness of IT blocks<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Attached patch fixes assertion fails due to inconsistent CPSR liveness of IT blocks.<o:p></o:p></p><p class=MsoNormal>See bug <a href="http://llvm.org/bugs/show_bug.cgi?id=18369">http://llvm.org/bugs/show_bug.cgi?id=18369</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><pre>The issue is caused when Post-RA scheduler reorders a bundle instruction (IT block) and a vseleq. However, it only flips the CPSR liveness of the bundle instruction, leaves the instructions inside the bundle unchanged, which causes inconstancy.<o:p></o:p></pre><p class=MsoNormal><o:p> </o:p></p><pre>This inconsistency causes Thumb2SizeReduction.cpp::ReduceMBB() crash because CPSR is expected to be LIVE for VSELEQD.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>There is a FIXME in Thumb2SizeReduction.cpp that tries to fixup such inconsistency, but it seems incomplete. This patch augments the fixup. Please help to review it.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Thanks,<o:p></o:p></pre><pre>Weiming<o:p></o:p></pre><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>