[llvm] r295855 - [RDF] Only access block live-ins when tracking liveness

[Krzysztof Parzyszek via llvm-commits]

Author: kparzysz
Date: Wed Feb 22 12:27:36 2017
New Revision: 295855

URL: http://llvm.org/viewvc/llvm-project?rev=295855&view=rev
Log:
[RDF] Only access block live-ins when tracking liveness

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

Modified: llvm/trunk/lib/Target/Hexagon/RDFGraph.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Hexagon/RDFGraph.cpp?rev=295855&r1=295854&r2=295855&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Hexagon/RDFGraph.cpp (original)
+++ llvm/trunk/lib/Target/Hexagon/RDFGraph.cpp Wed Feb 22 12:27:36 2017
@@ -907,8 +907,10 @@ void DataFlowGraph::build(unsigned Optio
   assert(EntryB.pred_empty() && "Function entry block has predecessors");
   for (auto I = MRI.livein_begin(), E = MRI.livein_end(); I != E; ++I)
     LiveIns.insert(RegisterRef(I->first));
-  for (auto I : EntryB.liveins())
-    LiveIns.insert(RegisterRef(I.PhysReg, I.LaneMask));
+  if (MRI.tracksLiveness()) {
+    for (auto I : EntryB.liveins())
+      LiveIns.insert(RegisterRef(I.PhysReg, I.LaneMask));
+  }
 
   // Add function-entry phi nodes for the live-in registers.
   for (std::pair<RegisterId,LaneBitmask> P : LiveIns) {