Index: lib/Analysis/DependenceAnalysis.cpp
===================================================================
--- lib/Analysis/DependenceAnalysis.cpp
+++ lib/Analysis/DependenceAnalysis.cpp
@@ -848,6 +848,15 @@
   }
 }
 
+static const Loop *getLowestCommonAncestor(const Loop *A, const Loop *B) {
+  if (!A || !B)
+    return nullptr;
+  if (A == B)
+    return A;
+  if (A->getLoopDepth() > B->getLoopDepth())
+    return getLowestCommonAncestor(A->getParentLoop(), B);
+  return getLowestCommonAncestor(A, B->getParentLoop());
+}
 
 // Examine the scev and return true iff it's linear.
 // Collect any loops mentioned in the set of "Loops".
@@ -856,6 +865,7 @@
   const SCEVAddRecExpr *AddRec = dyn_cast<SCEVAddRecExpr>(Src);
   if (!AddRec)
     return isLoopInvariant(Src, LoopNest);
+  const auto *Loop = AddRec->getLoop();
   const SCEV *Start = AddRec->getStart();
   const SCEV *Step = AddRec->getStepRecurrence(*SE);
   const SCEV *UB = SE->getBackedgeTakenCount(AddRec->getLoop());
@@ -866,6 +876,12 @@
         return false;
     }
   }
+
+  // Test if the Loop this AddRec refers to is an ancestor of LoopNest
+  auto *LCA = getLowestCommonAncestor(Loop, LoopNest);
+  if (LCA && LCA != Loop) // Loop is a sibling or uncle of LoopNest.
+    return false;
+
   if (!isLoopInvariant(Step, LoopNest))
     return false;
   Loops.set(mapSrcLoop(AddRec->getLoop()));
@@ -881,9 +897,10 @@
   const SCEVAddRecExpr *AddRec = dyn_cast<SCEVAddRecExpr>(Dst);
   if (!AddRec)
     return isLoopInvariant(Dst, LoopNest);
+  const auto *Loop = AddRec->getLoop();
   const SCEV *Start = AddRec->getStart();
   const SCEV *Step = AddRec->getStepRecurrence(*SE);
-  const SCEV *UB = SE->getBackedgeTakenCount(AddRec->getLoop());
+  const SCEV *UB = SE->getBackedgeTakenCount(Loop);
   if (!isa<SCEVCouldNotCompute>(UB)) {
     if (SE->getTypeSizeInBits(Start->getType()) <
         SE->getTypeSizeInBits(UB->getType())) {
@@ -891,9 +908,14 @@
         return false;
     }
   }
+  // Test if the Loop this AddRec refers to is an ancestor of LoopNest
+  auto *LCA = getLowestCommonAncestor(Loop, LoopNest);
+  if (LCA && LCA != Loop) // Loop is a sibling or uncle of LoopNest.
+    return false;
+
   if (!isLoopInvariant(Step, LoopNest))
     return false;
-  Loops.set(mapDstLoop(AddRec->getLoop()));
+  Loops.set(mapDstLoop(Loop));
   return checkDstSubscript(Start, LoopNest, Loops);
 }