diff --git a/lib/CodeGen/RegAllocBase.h b/lib/CodeGen/RegAllocBase.h
index a4b1667661b..072fe2bdb65 100644
--- a/lib/CodeGen/RegAllocBase.h
+++ b/lib/CodeGen/RegAllocBase.h
@@ -62,7 +62,6 @@ class RegAllocBase {
   // registers may have changed.
   unsigned UserTag;
 
-protected:
   // Array of LiveIntervalUnions indexed by physical register.
   class LiveUnionArray {
     unsigned NumRegs;
@@ -83,17 +82,19 @@ protected:
     }
   };
 
-  const TargetRegisterInfo *TRI;
-  MachineRegisterInfo *MRI;
-  VirtRegMap *VRM;
-  LiveIntervals *LIS;
-  RegisterClassInfo RegClassInfo;
   LiveUnionArray PhysReg2LiveUnion;
 
   // Current queries, one per physreg. They must be reinitialized each time we
   // query on a new live virtual register.
   OwningArrayPtr<LiveIntervalUnion::Query> Queries;
 
+protected:
+  const TargetRegisterInfo *TRI;
+  MachineRegisterInfo *MRI;
+  VirtRegMap *VRM;
+  LiveIntervals *LIS;
+  RegisterClassInfo RegClassInfo;
+
   RegAllocBase(): UserTag(0), TRI(0), MRI(0), VRM(0), LIS(0) {}
 
   virtual ~RegAllocBase() {}
@@ -110,6 +111,11 @@ protected:
     return Queries[PhysReg];
   }
 
+  // Get direct access to the underlying LiveIntervalUnion for PhysReg.
+  LiveIntervalUnion &getLiveUnion(unsigned PhysReg) {
+    return PhysReg2LiveUnion[PhysReg];
+  }
+
   // Invalidate all cached information about virtual registers - live ranges may
   // have changed.
   void invalidateVirtRegs() { ++UserTag; }
diff --git a/lib/CodeGen/RegAllocBasic.cpp b/lib/CodeGen/RegAllocBasic.cpp
index a659f5b7825..53dad76b3c2 100644
--- a/lib/CodeGen/RegAllocBasic.cpp
+++ b/lib/CodeGen/RegAllocBasic.cpp
@@ -250,9 +250,9 @@ unsigned RABasic::selectOrSplit(LiveInterval &VirtReg,
       // Found an available register.
       return PhysReg;
     }
-    Queries[interfReg].collectInterferingVRegs(1);
-    LiveInterval *interferingVirtReg =
-      Queries[interfReg].interferingVRegs().front();
+    LiveIntervalUnion::Query &IntfQ = query(VirtReg, interfReg);
+    IntfQ.collectInterferingVRegs(1);
+    LiveInterval *interferingVirtReg = IntfQ.interferingVRegs().front();
 
     // The current VirtReg must either be spillable, or one of its interferences
     // must have less spill weight.
diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp
index 366c94e2f47..f6e90abbe63 100644
--- a/lib/CodeGen/RegAllocGreedy.cpp
+++ b/lib/CodeGen/RegAllocGreedy.cpp
@@ -1288,7 +1288,7 @@ void RAGreedy::calcGapWeights(unsigned PhysReg,
     // surrounding the instruction. The exception is interference before
     // StartIdx and after StopIdx.
     //
-    LiveIntervalUnion::SegmentIter IntI = PhysReg2LiveUnion[*AI].find(StartIdx);
+    LiveIntervalUnion::SegmentIter IntI = getLiveUnion(*AI).find(StartIdx);
     for (unsigned Gap = 0; IntI.valid() && IntI.start() < StopIdx; ++IntI) {
       // Skip the gaps before IntI.
       while (Uses[Gap+1].getBoundaryIndex() < IntI.start())
@@ -1624,7 +1624,7 @@ bool RAGreedy::runOnMachineFunction(MachineFunction &mf) {
   ExtraRegInfo.clear();
   ExtraRegInfo.resize(MRI->getNumVirtRegs());
   NextCascade = 1;
-  IntfCache.init(MF, &PhysReg2LiveUnion[0], Indexes, TRI);
+  IntfCache.init(MF, &getLiveUnion(0), Indexes, TRI);
   GlobalCand.resize(32);  // This will grow as needed.
 
   allocatePhysRegs();