[llvm] r295856 - [RDF] Skip undef uses when calculating kill flags

[Krzysztof Parzyszek via llvm-commits]

Author: kparzysz
Date: Wed Feb 22 12:29:16 2017
New Revision: 295856

URL: http://llvm.org/viewvc/llvm-project?rev=295856&view=rev
Log:
[RDF] Skip undef uses when calculating kill flags

Modified:
    llvm/trunk/lib/Target/Hexagon/RDFLiveness.cpp

Modified: llvm/trunk/lib/Target/Hexagon/RDFLiveness.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Hexagon/RDFLiveness.cpp?rev=295856&r1=295855&r2=295856&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Hexagon/RDFLiveness.cpp (original)
+++ llvm/trunk/lib/Target/Hexagon/RDFLiveness.cpp Wed Feb 22 12:29:16 2017
@@ -801,7 +801,7 @@ void Liveness::resetKills(MachineBasicBl
         Live.reset(*SR);
     }
     for (auto &Op : MI->operands()) {
-      if (!Op.isReg() || !Op.isUse())
+      if (!Op.isReg() || !Op.isUse() || Op.isUndef())
         continue;
       unsigned R = Op.getReg();
       if (!TargetRegisterInfo::isPhysicalRegister(R))