Index: llvm/include/llvm/Analysis/IVDescriptors.h
===================================================================
--- llvm/include/llvm/Analysis/IVDescriptors.h
+++ llvm/include/llvm/Analysis/IVDescriptors.h
@@ -78,12 +78,14 @@
                        FastMathFlags FMF, Instruction *ExactFP, Type *RT,
                        bool Signed, bool Ordered,
                        SmallPtrSetImpl<Instruction *> &CI,
+                       SmallVectorImpl<Instruction *> &RdxChain,
                        unsigned MinWidthCastToRecurTy)
       : StartValue(Start), LoopExitInstr(Exit), Kind(K), FMF(FMF),
         ExactFPMathInst(ExactFP), RecurrenceType(RT), IsSigned(Signed),
         IsOrdered(Ordered),
         MinWidthCastToRecurrenceType(MinWidthCastToRecurTy) {
     CastInsts.insert(CI.begin(), CI.end());
+    ReductionChain.assign(RdxChain);
   }
 
   /// This POD struct holds information about a potential recurrence operation.
@@ -253,6 +255,12 @@
   /// recurrence.
   const SmallPtrSet<Instruction *, 8> &getCastInsts() const { return CastInsts; }
 
+  /// If found, returns the chain of operations from Phi to LoopExitInst that
+  /// can be treated as a set of reduction instructions for in-loop reductions.
+  const SmallVector<Instruction *, 4> &getReductionOpChain() const {
+    return ReductionChain;
+  }
+
   /// Returns the minimum width used by the recurrence in bits.
   unsigned getMinWidthCastToRecurrenceTypeInBits() const {
     return MinWidthCastToRecurrenceType;
@@ -266,8 +274,9 @@
 
   /// Attempts to find a chain of operations from Phi to LoopExitInst that can
   /// be treated as a set of reductions instructions for in-loop reductions.
-  SmallVector<Instruction *, 4> getReductionOpChain(PHINode *Phi,
-                                                    Loop *L) const;
+  static SmallVector<Instruction *, 4>
+  findReductionOpChain(PHINode *OrigPhi, Loop *L, Instruction *LoopExitInstr,
+                       unsigned RedOp);
 
   /// Returns true if the instruction is a call to the llvm.fmuladd intrinsic.
   static bool isFMulAddIntrinsic(Instruction *I) {
@@ -298,6 +307,8 @@
   bool IsOrdered = false;
   // Instructions used for type-promoting the recurrence.
   SmallPtrSet<Instruction *, 8> CastInsts;
+  // The chain of operations between the reduction Phi and the exit instruction.
+  SmallVector<Instruction *, 4> ReductionChain;
   // The minimum width used by the recurrence.
   unsigned MinWidthCastToRecurrenceType;
 };
Index: llvm/lib/Analysis/IVDescriptors.cpp
===================================================================
--- llvm/lib/Analysis/IVDescriptors.cpp
+++ llvm/lib/Analysis/IVDescriptors.cpp
@@ -218,8 +218,7 @@
       !RecurrenceDescriptor::isFMulAddIntrinsic(Exit))
     return false;
 
-  // Ensure the exit instruction has only one user other than the reduction PHI
-  if (Exit != ExactFPMathInst || Exit->hasNUsesOrMore(3))
+  if (Exit != ExactFPMathInst)
     return false;
 
   // The only pattern accepted is the one in which the reduction PHI
@@ -480,8 +479,14 @@
   if (!FoundStartPHI || !FoundReduxOp || !ExitInstruction)
     return false;
 
-  const bool IsOrdered = checkOrderedReduction(
-      Kind, ReduxDesc.getExactFPMathInst(), ExitInstruction, Phi);
+  SmallVector<Instruction *, 4> ReductionChain;
+  ReductionChain =
+      findReductionOpChain(Phi, TheLoop, ExitInstruction, getOpcode(Kind));
+
+  bool IsOrdered = false;
+  if (!ReductionChain.empty())
+    IsOrdered = checkOrderedReduction(Kind, ReduxDesc.getExactFPMathInst(),
+                                      ExitInstruction, Phi);
 
   if (Start != Phi) {
     // If the starting value is not the same as the phi node, we speculatively
@@ -540,7 +545,7 @@
   // Save the description of this reduction variable.
   RecurrenceDescriptor RD(RdxStart, ExitInstruction, Kind, FMF,
                           ReduxDesc.getExactFPMathInst(), RecurrenceType,
-                          IsSigned, IsOrdered, CastInsts,
+                          IsSigned, IsOrdered, CastInsts, ReductionChain,
                           MinWidthCastToRecurrenceType);
   RedDes = RD;
 
@@ -1033,9 +1038,10 @@
 }
 
 SmallVector<Instruction *, 4>
-RecurrenceDescriptor::getReductionOpChain(PHINode *Phi, Loop *L) const {
+RecurrenceDescriptor::findReductionOpChain(PHINode *Phi, Loop *L,
+                                           Instruction *LoopExitInstr,
+                                           unsigned RedOp) {
   SmallVector<Instruction *, 4> ReductionOperations;
-  unsigned RedOp = getOpcode(Kind);
 
   // Search down from the Phi to the LoopExitInstr, looking for instructions
   // with a single user of the correct type for the reduction.
Index: llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
===================================================================
--- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -7737,7 +7737,7 @@
     // finding the chain of operations that leads from the phi to the loop
     // exit value.
     SmallVector<Instruction *, 4> ReductionOperations =
-        RdxDesc.getReductionOpChain(Phi, TheLoop);
+        RdxDesc.getReductionOpChain();
     bool InLoop = !ReductionOperations.empty();
     if (InLoop) {
       InLoopReductionChains[Phi] = ReductionOperations;